Tcl Library Source Code

Check-in [6010c7a80d]
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Bounty program for improvements to Tcl and certain Tcl packages.
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Overview
Comment:Whoops. Wrong mime
Timelines: family | ancestors | descendants | both | hypnotoad
Files: files | file ages | folders
SHA3-256: 6010c7a80d90b2ff34102d469e181324795b469d2dc518695f637878c179ddcb
User & Date: hypnotoad 2018-12-06 23:09:34
Context
2018-12-06
23:15
Smtp.tcl reverted to the pooryorick version All package require mime 1.6 have been changes to package require -exact mime check-in: 5e923cd325 user: hypnotoad tags: hypnotoad
23:09
Whoops. Wrong mime check-in: 6010c7a80d user: hypnotoad tags: hypnotoad
22:46
Rolled oometa back to the release version check-in: eb80bb87f0 user: hypnotoad tags: hypnotoad
Changes
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# (c) 2000      Dan Kuchler
# (c) 2000-2001 Eric Melski
# (c) 2001      Jeff Hobbs
# (c) 2001-2008 Andreas Kupries
# (c) 2002-2003 David Welton
# (c) 2003-2008 Pat Thoyts
# (c) 2005      Benjamin Riefenstahl
# (c) 2013      PoorYorick
#
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#
# Influenced by Borenstein's/Rose's safe-tcl (circa 1993) and Darren New's
# unpublished package of 1999.
#

# new string features and inline scan are used, requiring 8.3.



package require Tcl 8.5










package provide mime 1.6

if {[catch {package require Trf 2.0}]} {

    # Fall-back to tcl-based procedures of base64 and quoted-printable encoders
    # Warning!
    # These are a fragile emulations of the more general calling sequence
    # that appears to work with this code here.
................................................................................
    unset ::major
}

#
# state variables:
#
#     canonicalP: input is in its canonical form
#     content: type/subtype
#     params: seralized array of key/value pairs (keys are lower-case)
#     encoding: transfer encoding
#     version: MIME-version
#     header: serialized array of key/value pairs (keys are lower-case)
#     lowerL: list of header keys, lower-case
#     mixedL: list of header keys, mixed-case
#     value: either "file", "parts", or "string"
#
#     file: input file
#     fd: cached file-descriptor, typically for root
#     root: token for top-level part, for (distant) subordinates
#     offset: number of octets from beginning of file/string
#     count: length in octets of (encoded) content
#
#     parts: list of bodies (tokens)
#
#     string: input string
#
#     cid: last child-id assigned
#


namespace eval ::mime {

    variable mime
    array set mime {uid 0 cid 0}


    # RFC 822 lexemes
    variable addrtokenL
    lappend addrtokenL \; , < > : . ( ) @ \" \[ ] \\
    variable addrlexemeL {
        LX_SEMICOLON LX_COMMA
        LX_LBRACKET  LX_RBRACKET
................................................................................
        LX_COLON     LX_DOT
        LX_LPAREN    LX_RPAREN
        LX_ATSIGN    LX_QUOTE
        LX_LSQUARE   LX_RSQUARE
        LX_QUOTE
    }

    # RFC 2045 lexemes
    variable typetokenL
    lappend typetokenL \; , < > : ? ( ) @ \" \[ \] = / \\
    variable typelexemeL {
        LX_SEMICOLON LX_COMMA
        LX_LBRACKET  LX_RBRACKET
        LX_COLON     LX_QUESTION
        LX_LPAREN    LX_RPAREN
        LX_ATSIGN    LX_QUOTE
        LX_LSQUARE   LX_RSQUARE
        LX_EQUALS    LX_SOLIDUS
        LX_QUOTE
    }

    variable encList {
        ascii US-ASCII
        big5 Big5
        cp1250 Windows-1250
        cp1251 Windows-1251
        cp1252 Windows-1252
        cp1253 Windows-1253
................................................................................
        ksc5601 KS_C_5601-1989
        ksc5601 KSC5601
        ksc5601 korean
        shiftjis MS_Kanji
        utf-8 UTF8
    }

    namespace export initialize finalize getproperty \
                     getheader setheader \
                     getbody \
                     copymessage \
                     mapencoding \
                     reversemapencoding \
                     parseaddress \
                     parsedatetime \
                     uniqueID

}

# ::mime::initialize --
#
#    Creates a MIME part, and returnes the MIME token for that part.
#
# Arguments:
#    args   Args can be any one of the following:
#                  ?-canonical type/subtype
#                  ?-param    {key value}?...
#                  ?-encoding value?
#                  ?-header   {key value}?... ?
#                  (-file name | -string value | -parts {token1 ... tokenN})
#
#       If the -canonical option is present, then the body is in
#       canonical (raw) form and is found by consulting either the -file,
#       -string, or -parts option.
#
#       In addition, both the -param and -header options may occur zero
#       or more times to specify "Content-Type" parameters (e.g.,
#       "charset") and header keyword/values (e.g.,
#       "Content-Disposition"), respectively.
#
#       Also, -encoding, if present, specifies the
#       "Content-Transfer-Encoding" when copying the body.
#
#       If the -canonical option is not present, then the MIME part
#       contained in either the -file or the -string option is parsed,
#       dynamically generating subordinates as appropriate.
#
# Results:
#    An initialized mime token.

proc ::mime::initialize args {
    global errorCode errorInfo

    variable mime

    set token [namespace current]::[incr mime(uid)]
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    if {[catch {{*}[list mime::initializeaux $token {*}$args]} result eopts]} {
        catch {mime::finalize $token -subordinates dynamic}
        return -options $eopts $result
    }
    return $token
}

# ::mime::initializeaux --
#
#    Configures the MIME token created in mime::initialize based on
#       the arguments that mime::initialize supports.
#
# Arguments:
#       token  The MIME token to configure.
#    args   Args can be any one of the following:
#                  ?-canonical type/subtype
#                  ?-param    {key value}?...
#                  ?-encoding value?
#                  ?-header   {key value}?... ?
#                  (-file name | -string value | -parts {token1 ... tokenN})
#
# Results:
#       Either configures the mime token, or throws an error.

proc ::mime::initializeaux {token args} {
    global errorCode errorInfo
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    array set params [set state(params) {}]
    set state(encoding) {}
    set state(version) 1.0

    set state(header) {}
    set state(lowerL) {}
    set state(mixedL) {}

    set state(cid) 0

    set argc [llength $args]
    for {set argx 0} {$argx < $argc} {incr argx} {
        set option [lindex $args $argx]
        if {[incr argx] >= $argc} {
            error "missing argument to $option"
        }
        set value [lindex $args $argx]

        switch -- $option {
            -canonical {
                set state(content) [string tolower $value]
            }

            -param {
                if {[llength $value] != 2} {
                    error "-param expects a key and a value, not $value"
                }
                set lower [string tolower [set mixed [lindex $value 0]]]
                if {[info exists params($lower)]} {
                    error "the $mixed parameter may be specified at most once"
                }

                set params($lower) [lindex $value 1]
                set state(params) [array get params]
            }

            -encoding {
                switch -- [set state(encoding) [string tolower $value]] {
                    7bit - 8bit - binary - quoted-printable - base64 {
                    }

                    default {
                        error "unknown value for -encoding $state(encoding)"
                    }
                }
            }

            -header {
                if {[llength $value] != 2} {
                    error "-header expects a key and a value, not $value"
                }
                set lower [string tolower [set mixed [lindex $value 0]]]
                if {$lower eq "content-type"} {
                    error "use -canonical instead of -header $value"
                }
                if {$lower eq "content-transfer-encoding"} {
                    error "use -encoding instead of -header $value"
                }
                if {$lower in {content-md5 mime-version}} {
                    error "don't go there..."
                }
                if {$lower ni $state(lowerL)} {
                    lappend state(lowerL) $lower
                    lappend state(mixedL) $mixed
                }

                array set header $state(header)
                lappend header($lower) [lindex $value 1]
                set state(header) [array get header]
            }

            -file {
                set state(file) $value
            }

            -parts {
                set state(parts) $value
            }

            -string {
                set state(string) $value

                set state(lines) [split $value \n]
                set state(lines.count) [llength $state(lines)]
                set state(lines.current) 0
            }

            -root {
                # the following are internal options

                set state(root) $value
            }

            -offset {
                set state(offset) $value
            }

            -count {
                set state(count) $value
            }

            -lineslist {
                set state(lines) $value
                set state(lines.count) [llength $state(lines)]
                set state(lines.current) 0
                #state(string) is needed, but will be built when required
                set state(string) {}
            }

            default {
                error "unknown option $option"
            }
        }
    }

    #We only want one of -file, -parts or -string:
    set valueN 0
    foreach value {file parts string} {
        if {[info exists state($value)]} {
            set state(value) $value
            incr valueN
        }
    }
    if {$valueN != 1 && ![info exists state(lines)]} {
        error "specify exactly one of -file, -parts, or -string"
    }

    if {[set state(canonicalP) [info exists state(content)]]} {
        switch -- $state(value) {
            file {
                set state(offset) 0
            }

            parts {
                switch -glob -- $state(content) {
                    text/*
                        -
                    image/*
                        -
                    audio/*
                        -
                    video/* {
                        error "-canonical $state(content) and -parts do not mix"
                    }

                    default {
                        if {$state(encoding) ne {}} {
                            error "-encoding and -parts do not mix"
                        }
                    }
                }
            }
            default {# Go ahead}
        }

        if {[lsearch -exact $state(lowerL) content-id] < 0} {
            lappend state(lowerL) content-id
            lappend state(mixedL) Content-ID

            array set header $state(header)
            lappend header(content-id) [uniqueID]
            set state(header) [array get header]
        }

        set state(version) 1.0

        return
    }

    if {$state(params) ne {}} {
        error "-param requires -canonical"
    }
    if {$state(encoding) ne {}} {
        error "-encoding requires -canonical"
    }
    if {$state(header) ne {}} {
        error "-header requires -canonical"
    }
    if {[info exists state(parts)]} {
        error "-parts requires -canonical"
    }

    if {[set fileP [info exists state(file)]]} {
        if {[set openP [info exists state(root)]]} {
            # FRINK: nocheck
            variable $state(root)
            upvar 0 $state(root) root

            set state(fd) $root(fd)
        } else {
            set state(root) $token
            set state(fd) [open $state(file) RDONLY]
            set state(offset) 0
            seek $state(fd) 0 end
            set state(count) [tell $state(fd)]

            fconfigure $state(fd) -translation binary
        }
    }

    set code [catch {mime::parsepart $token} result]
    set ecode $errorCode
    set einfo $errorInfo

    if {$fileP} {
        if {!$openP} {
            unset state(root)
            catch {close $state(fd)}
        }
        unset state(fd)
    }

    return -code $code -errorinfo $einfo -errorcode $ecode $result
}

# ::mime::parsepart --
#
#       Parses the MIME headers and attempts to break up the message
#       into its various parts, creating a MIME token for each part.
#
# Arguments:
#       token  The MIME token to parse.
#
# Results:
#       Throws an error if it has problems parsing the MIME token,
#       otherwise it just sets up the appropriate variables.

proc ::mime::parsepart {token} {
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    if {[set fileP [info exists state(file)]]} {
        seek $state(fd) [set pos $state(offset)] start
        set last [expr {$state(offset) + $state(count) - 1}]
    } else {
        set string $state(string)
    }

    set vline {}
    while 1 {
        set blankP 0
        if {$fileP} {
            if {($pos > $last) || ([set x [gets $state(fd) line]] <= 0)} {
                set blankP 1
            } else {
                incr pos [expr {$x + 1}]
            }
        } else {

        if {$state(lines.current) >= $state(lines.count)} {
            set blankP 1
            set line {}
        } else {
            set line [lindex $state(lines) $state(lines.current)]
            incr state(lines.current)
            set x [string length $line]
            if {$x == 0} {set blankP 1}
        }

        }

         if {(!$blankP) && ([string last \r $line] == {$x - 1})} {
             set line [string range $line 0 [expr {$x - 2}]]
             if {$x == 1} {
                 set blankP 1
             }
         }

        if {(!$blankP) && (([
            string first { } $line] == 0) || ([
            string first \t $line] == 0))} {
            append vline \n $line
            continue
        }

        if {$vline eq {}} {
            if {$blankP} {
                break
            }

            set vline $line
            continue
        }

        if {([set x [string first : $vline]] <= 0) \
                || ([set mixed [ string trimright [
                    string range $vline 0 [expr {$x - 1}]]
                ]] eq {})
            } {
            error "improper line in header: $vline"
        }
        set value [string trim [string range $vline [expr {$x + 1}] end]]
        switch -- [set lower [string tolower $mixed]] {
            content-type {
                if {[info exists state(content)]} {
                    error "multiple Content-Type fields starting with $vline"
                }

                if {![catch {set x [parsetype $token $value]}]} {
                    set state(content) [lindex $x 0]
                    set state(params) [lindex $x 1]
                }
            }

            content-md5 {
            }

            content-transfer-encoding {
                if {($state(encoding) ne {}) \
                        && ($state(encoding) ne [
                            string tolower $value])} {
                    error "multiple Content-Transfer-Encoding fields starting with $vline"
                }

                set state(encoding) [string tolower $value]
            }

            mime-version {
                set state(version) $value
            }

            default {
                if {[lsearch -exact $state(lowerL) $lower] < 0} {
                    lappend state(lowerL) $lower
                    lappend state(mixedL) $mixed
                }

                array set header $state(header)
                lappend header($lower) $value
                set state(header) [array get header]
            }
        }

        if {$blankP} {
            break
        }
        set vline $line
    }

    if {![info exists state(content)]} {
        set state(content) text/plain
        set state(params) [list charset us-ascii]
    }

    if {![string match multipart/* $state(content)]} {
        if {$fileP} {
            set x [tell $state(fd)]
            incr state(count) [expr {$state(offset) - $x}]
            set state(offset) $x
        } else {
            # rebuild string, this is cheap and needed by other functions
            set state(string) [join [
                lrange $state(lines) $state(lines.current) end] \n]
        }

        if {[string match message/* $state(content)]} {
            # FRINK: nocheck
            variable [set child $token-[incr state(cid)]]

            set state(value) parts
            set state(parts) $child
            if {$fileP} {
                mime::initializeaux $child \
                    -file $state(file) -root $state(root) \
                    -offset $state(offset) -count $state(count)
            } else {
                if {[info exists state(encoding)]} {
                    set strng [join [
                        lrange $state(lines) $state(lines.current) end] \n]
                    switch -- $state(encoding) {
                        base64 -
                        quoted-printable {
                            set strng [$state(encoding) -mode decode -- $strng]
                        }
                        default {}
                    }
                    mime::initializeaux $child -string $strng
                } else {
                    mime::initializeaux $child -lineslist [
                        lrange $state(lines) $state(lines.current) end]
                }
            }
        }

        return
    }

    set state(value) parts

    set boundary {}
    foreach {k v} $state(params) {
        if {$k eq "boundary"} {
            set boundary $v
            break
        }
    }
    if {$boundary eq {}} {
        error "boundary parameter is missing in $state(content)"
    }
    if {[string trim $boundary] eq {}} {
        error "boundary parameter is empty in $state(content)"
    }

    if {$fileP} {
        set pos [tell $state(fd)]
            # This variable is like 'start', for the reasons laid out
            # below, in the other branch of this conditional.
            set initialpos $pos
        } else {
            # This variable is like 'start', a list of lines in the
            # part. This record is made even before we find a starting
            # boundary and used if we run into the terminating boundary
            # before a starting boundary was found. In that case the lines
            # before the terminator as recorded by tracelines are seen as
            # the part, or at least we attempt to parse them as a
            # part. See the forceoctet and nochild flags later. We cannot
            # use 'start' as that records lines only after the starting
            # boundary was found.
            set tracelines [list]
    }

    set inP 0
    set moreP 1
    set forceoctet 0
    while {$moreP} {
        if {$fileP} {
            if {$pos > $last} {
                # We have run over the end of the part per the outer
                # information without finding a terminating boundary.
                # We now fake the boundary and force the parser to
                # give any new part coming of this a mime-type of
                # application/octet-stream regardless of header
                # information.
                set line "--$boundary--"
                set x [string length $line]
                set forceoctet 1
            } else {
                if {[set x [gets $state(fd) line]] < 0} {
                    error "end-of-file encountered while parsing $state(content)"
                }
            }
            incr pos [expr {$x + 1}]
        } else {
            if {$state(lines.current) >= $state(lines.count)} {
                error "end-of-string encountered while parsing $state(content)"
            } else {
                set line [lindex $state(lines) $state(lines.current)]
                incr state(lines.current)
                set x [string length $line]
            }
            set x [string length $line]
        }
        if {[string last \r $line] == $x - 1} {
            set line [string range $line 0 [expr {$x - 2}]]
            set crlf 2
        } else {
            set crlf 1
        }

        if {[string first --$boundary $line] != 0} {
             if {$inP && !$fileP} {
                 lappend start $line
             }
             continue
        } else {
            lappend tracelines $line
        }

        if {!$inP} {
            # Haven't seen the starting boundary yet. Check if the
            # current line contains this starting boundary.

            if {$line eq "--$boundary"} {
                # Yes. Switch parser state to now search for the
                # terminating boundary of the part and record where
                # the part begins (or initialize the recorder for the
                # lines in the part).
                set inP 1
                if {$fileP} {
                    set start $pos
                } else {
                    set start [list]
                }
                continue
            } elseif {$line eq "--$boundary--"} {
                # We just saw a terminating boundary before we ever
                # saw the starting boundary of a part. This forces us
                # to stop parsing, we do this by forcing the parser
                # into an accepting state. We will try to create a
                # child part based on faked start position or recorded
                # lines, or, if that fails, let the current part have
                # no children.

                # As an example note the test case mime-3.7 and the
                # referenced file "badmail1.txt".

                set inP 1
                if {$fileP} {
                    set start $initialpos
                } else {
                    set start $tracelines
                }
                set forceoctet 1
                # Fall through. This brings to the creation of the new
                # part instead of searching further and possible
                # running over the end.
            } else {
                continue
            }
        }

        # Looking for the end of the current part. We accept both a
        # terminating boundary and the starting boundary of the next
        # part as the end of the current part.

        if {[set moreP [string compare $line --$boundary--]] \
                && $line ne "--$boundary"} {
            # The current part has not ended, so we record the line
            # if we are inside a part and doing string parsing.
            if {$inP && !$fileP} {
                lappend start $line
            }
            continue
        }

        # The current part has ended. We now determine the exact
        # boundaries, create a mime part object for it and recursively
        # parse it deeper as part of that action.

        # FRINK: nocheck
        variable [set child $token-[incr state(cid)]]

        lappend state(parts) $child

        set nochild 0
        if {$fileP} {
            if {[set count [expr {$pos - ($start + $x + $crlf + 1)}]] < 0} {
                set count 0
            }
            if {$forceoctet} {
                set ::errorInfo {}
                if {[catch {
                    mime::initializeaux $child \
                        -file $state(file) -root $state(root) \
                        -offset $start -count $count
                }]} {
                    set nochild 1
                    set state(parts) [lrange $state(parts) 0 end-1]
                } } else {
                mime::initializeaux $child \
                    -file $state(file) -root $state(root) \
                    -offset $start -count $count
            }
            seek $state(fd) [set start $pos] start
        } else {
            if {$forceoctet} {
                if {[catch {
                    mime::initializeaux $child -lineslist $start
                }]} {
                    set nochild 1
                    set state(parts) [lrange $state(parts) 0 end-1]
                }
            } else {
                mime::initializeaux $child -lineslist $start
            }
            set start {}
        }
        if {$forceoctet && !$nochild} {
            variable $child
            upvar 0  $child childstate
            set childstate(content) application/octet-stream
        }
        set forceoctet 0
    }
}

# ::mime::parsetype --
#
#       Parses the string passed in and identifies the content-type and
#       params strings.
#
# Arguments:
#       token  The MIME token to parse.
#       string The content-type string that should be parsed.
#
# Results:
#       Returns the content and params for the string as a two element
#       tcl list.

proc ::mime::parsetype {token string} {
    global errorCode errorInfo
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    variable typetokenL
    variable typelexemeL

    set state(input)   $string
    set state(buffer)  {}
    set state(lastC)   LX_END
    set state(comment) {}
    set state(tokenL)  $typetokenL
    set state(lexemeL) $typelexemeL

    set code [catch {mime::parsetypeaux $token $string} result]
    set ecode $errorCode
    set einfo $errorInfo

    unset state(input)   \
          state(buffer)  \
          state(lastC)   \
          state(comment) \
          state(tokenL)  \
          state(lexemeL)

    return -code $code -errorinfo $einfo -errorcode $ecode $result
}

# ::mime::parsetypeaux --
#
#       A helper function for mime::parsetype.  Parses the specified
#       string looking for the content type and params.
#
# Arguments:
#       token  The MIME token to parse.
#       string The content-type string that should be parsed.
#
# Results:
#       Returns the content and params for the string as a two element
#       tcl list.

proc ::mime::parsetypeaux {token string} {
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    if {[parselexeme $token] ne "LX_ATOM"} {
        error [format "expecting type (found %s)" $state(buffer)]
    }
    set type [string tolower $state(buffer)]

    switch -- [parselexeme $token] {
        LX_SOLIDUS {
        }

        LX_END {
            if {$type ne "message"} {
                error "expecting type/subtype (found $type)"
            }

            return [list message/rfc822 {}]
        }

        default {
            error [format "expecting \"/\" (found %s)" $state(buffer)]
        }
    }

    if {[parselexeme $token] ne "LX_ATOM"} {
        error [format "expecting subtype (found %s)" $state(buffer)]
    }
    append type [string tolower /$state(buffer)]

    array set params {}
    while {1} {
        switch -- [parselexeme $token] {
            LX_END {
                return [list $type [array get params]]
            }

            LX_SEMICOLON {
            }

            default {
                error [format "expecting \";\" (found %s)" $state(buffer)]
            }
        }

        switch -- [parselexeme $token] {
            LX_END {
                return [list $type [array get params]]
            }

            LX_ATOM {
            }

            default {
                error [format "expecting attribute (found %s)" $state(buffer)]
            }
        }

        set attribute [string tolower $state(buffer)]

        if {[parselexeme $token] ne "LX_EQUALS"} {
            error [format "expecting \"=\" (found %s)" $state(buffer)]
        }

        switch -- [parselexeme $token] {
            LX_ATOM {
            }

            LX_QSTRING {
                set state(buffer) [
                    string range $state(buffer) 1 [
                        expr {[string length $state(buffer)] - 2}]]
            }

            default {
                error [format "expecting value (found %s)" $state(buffer)]
            }
        }
        set params($attribute) $state(buffer)
    }
}

# ::mime::finalize --
#
#   mime::finalize destroys a MIME part.
#
#   If the -subordinates option is present, it specifies which
#   subordinates should also be destroyed. The default value is
#   "dynamic".
#
# Arguments:
#       token  The MIME token to parse.
#       args   Args can be optionally be of the following form:
#              ?-subordinates "all" | "dynamic" | "none"?
#
# Results:
#       Returns an empty string.

proc ::mime::finalize {token args} {
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    array set options [list -subordinates dynamic]
    array set options $args

    switch -- $options(-subordinates) {
        all {
            #TODO: this code path is untested
            if {$state(value) eq "parts"} {
                foreach part $state(parts) {
                    eval [linsert $args 0 mime::finalize $part]
                }
            }
        }

        dynamic {
            for {set cid $state(cid)} {$cid > 0} {incr cid -1} {
                eval [linsert $args 0 mime::finalize $token-$cid]
            }
        }

        none {
        }

        default {
            error "unknown value for -subordinates $options(-subordinates)"
        }
    }

    foreach name [array names state] {
        unset state($name)
    }
    # FRINK: nocheck
    unset $token
}

# ::mime::getproperty --
#
#   mime::getproperty returns the properties of a MIME part.
#
#   The properties are:
#
#       property    value
#       ========    =====
#       content     the type/subtype describing the content
#       encoding    the "Content-Transfer-Encoding"
#       params      a list of "Content-Type" parameters
#       parts       a list of tokens for the part's subordinates
#       size        the approximate size of the content (unencoded)
#
#   The "parts" property is present only if the MIME part has
#   subordinates.
#
#   If mime::getproperty is invoked with the name of a specific
#   property, then the corresponding value is returned; instead, if
#   -names is specified, a list of all properties is returned;
#   otherwise, a serialized array of properties and values is returned.
#
# Arguments:
#       token      The MIME token to parse.
#       property   One of 'content', 'encoding', 'params', 'parts', and
#                  'size'. Defaults to returning a serialized array of
#                  properties and values.
#
# Results:
#       Returns the properties of a MIME part

proc ::mime::getproperty {token {property {}}} {
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    switch -- $property {
        {} {
            array set properties [list content  $state(content) \
                                       encoding $state(encoding) \
                                       params   $state(params) \
                                       size     [getsize $token]]
            if {[info exists state(parts)]} {
                set properties(parts) $state(parts)

            }

            return [array get properties]
        }

        -names {
            set names [list content encoding params]
            if {[info exists state(parts)]} {
                lappend names parts
            }

            return $names
        }

        content
            -
        encoding
            -
        params {
            return $state($property)
        }

        parts {
            if {![info exists state(parts)]} {
                error "MIME part is a leaf"
            }

            return $state(parts)
        }

        size {
            return [getsize $token]
        }

        default {
            error "unknown property $property"
        }
    }
}

# ::mime::getsize --
#
#    Determine the size (in bytes) of a MIME part/token
#
# Arguments:
#       token      The MIME token to parse.
#
# Results:
#       Returns the size in bytes of the MIME token.

proc ::mime::getsize {token} {
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    switch -- $state(value)/$state(canonicalP) {
        file/0 {
            set size $state(count)
        }

        file/1 {
            return [file size $state(file)]
        }

        parts/0
            -
        parts/1 {
            set size 0
            foreach part $state(parts) {
                incr size [getsize $part]
            }

            return $size
        }

        string/0 {
            set size [string length $state(string)]
        }

        string/1 {
            return [string length $state(string)]
        }
        default {
            error "Unknown combination \"$state(value)/$state(canonicalP)\""
        }
    }

    if {$state(encoding) eq "base64"} {
        set size [expr {($size * 3 + 2) / 4}]
    }

    return $size
}

# ::mime::getheader --
#
#    mime::getheader returns the header of a MIME part.
#
#    A header consists of zero or more key/value pairs. Each value is a
#    list containing one or more strings.
#
#    If mime::getheader is invoked with the name of a specific key, then
#    a list containing the corresponding value(s) is returned; instead,
#    if -names is specified, a list of all keys is returned; otherwise, a
#    serialized array of keys and values is returned. Note that when a
#    key is specified (e.g., "Subject"), the list returned usually
#    contains exactly one string; however, some keys (e.g., "Received")
#    often occur more than once in the header, accordingly the list
#    returned usually contains more than one string.
#
# Arguments:
#       token      The MIME token to parse.
#       key        Either a key or '-names'.  If it is '-names' a list
#                  of all keys is returned.
#
# Results:
#       Returns the header of a MIME part.

proc ::mime::getheader {token {key {}}} {
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    array set header $state(header)
    switch -- $key {
        {} {
            set result {}
            foreach lower $state(lowerL) mixed $state(mixedL) {
                lappend result $mixed $header($lower)
            }
            return $result
        }

        -names {
            return $state(mixedL)
        }

        default {
            set lower [string tolower [set mixed $key]]

            if {![info exists header($lower)]} {
                error "key $mixed not in header"
            }
            return $header($lower)
        }
    }
}

# ::mime::setheader --
#
#    mime::setheader writes, appends to, or deletes the value associated
#    with a key in the header.
#
#    The value for -mode is one of:
#
#       write: the key/value is either created or overwritten (the
#       default);
#
#       append: a new value is appended for the key (creating it as
#       necessary); or,
#
#       delete: all values associated with the key are removed (the
#       "value" parameter is ignored).
#
#    Regardless, mime::setheader returns the previous value associated
#    with the key.
#
# Arguments:
#       token      The MIME token to parse.
#       key        The name of the key whose value should be set.
#       value      The value for the header key to be set to.
#       args       An optional argument of the form:
#                  ?-mode "write" | "append" | "delete"?
#
# Results:
#       Returns previous value associated with the specified key.

proc ::mime::setheader {token key value args} {
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    array set options [list -mode write]
    array set options $args

    switch -- [set lower [string tolower $key]] {
        content-md5
            -
        content-type
            -
        content-transfer-encoding
            -
        mime-version {
            error "key $key may not be set"
        }
        default {# Skip key}
    }

    array set header $state(header)
    if {[set x [lsearch -exact $state(lowerL) $lower]] < 0} {
        #TODO: this code path is not tested
        if {$options(-mode) eq "delete"} {
            error "key $key not in header"
        }

        lappend state(lowerL) $lower
        lappend state(mixedL) $key

        set result {}
    } else {
        set result $header($lower)
    }
    switch -- $options(-mode) {
        append {
            lappend header($lower) $value
        }

        delete {
            unset header($lower)
            set state(lowerL) [lreplace $state(lowerL) $x $x]
            set state(mixedL) [lreplace $state(mixedL) $x $x]
        }

        write {
            set header($lower) [list $value]
        }

        default {
            error "unknown value for -mode $options(-mode)"
        }
    }

    set state(header) [array get header]

    return $result
}

# ::mime::getbody --
#
#    mime::getbody returns the body of a leaf MIME part in canonical form.
#
#    If the -command option is present, then it is repeatedly invoked
#    with a fragment of the body as this:
#
#        uplevel #0 $callback [list "data" $fragment]
#
#    (The -blocksize option, if present, specifies the maximum size of
#    each fragment passed to the callback.)
#    When the end of the body is reached, the callback is invoked as:
#
#        uplevel #0 $callback "end"
#
#    Alternatively, if an error occurs, the callback is invoked as:
#
#        uplevel #0 $callback [list "error" reason]
#
#    Regardless, the return value of the final invocation of the callback
#    is propagated upwards by mime::getbody.
#
#    If the -command option is absent, then the return value of
#    mime::getbody is a string containing the MIME part's entire body.
#
# Arguments:
#       token      The MIME token to parse.
#       args       Optional arguments of the form:
#                  ?-decode? ?-command callback ?-blocksize octets? ?
#
# Results:
#       Returns a string containing the MIME part's entire body, or
#       if '-command' is specified, the return value of the command
#       is returned.

proc ::mime::getbody {token args} {
    global errorCode errorInfo
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    set decode 0
    if {[set pos [lsearch -exact $args -decode]] >= 0} {
        set decode 1
        set args [lreplace $args $pos $pos]
    }

    array set options [list -command [
        list mime::getbodyaux $token] -blocksize 4096]
    array set options $args
    if {$options(-blocksize) < 1} {
        error "-blocksize expects a positive integer, not $options(-blocksize)"
    }

    set code 0
    set ecode {}
    set einfo {}

    switch -- $state(value)/$state(canonicalP) {
        file/0 {
            set fd [open $state(file) RDONLY]

            set code [catch {

                fconfigure $fd -translation binary
                seek $fd [set pos $state(offset)] start
                set last [expr {$state(offset) + $state(count) - 1}]

                set fragment {}
                while {$pos <= $last} {
                    if {[set cc [
                        expr {($last - $pos) + 1}]] > $options(-blocksize)} {
                        set cc $options(-blocksize)
                    }
                    incr pos [set len [
                        string length [set chunk [read $fd $cc]]]]
                    switch -exact -- $state(encoding) {
                        base64
                            -
                        quoted-printable {
                            if {([set x [string last \n $chunk]] > 0) \
                                    && ($x + 1 != $len)} {
                                set chunk [string range $chunk 0 $x]
                                seek $fd [incr pos [expr {($x + 1) - $len}]] start
                            }
                            set chunk [
                                $state(encoding) -mode decode -- $chunk]
                        }
                        7bit - 8bit - binary - {} {
                            # Bugfix for [#477088]
                            # Go ahead, leave chunk alone
                        }
                        default {
                            error "Can't handle content encoding \"$state(encoding)\""
                        }
                    }
                    append fragment $chunk

                    set cc [expr {$options(-blocksize) - 1}]
                    while {[string length $fragment] > $options(-blocksize)} {
                        uplevel #0 $options(-command) [
                            list data [string range $fragment 0 $cc]]

                        set fragment [
                            string range $fragment $options(-blocksize) end]
                    }
                }
                if {[string length $fragment] > 0} {
                    uplevel #0 $options(-command) [list data $fragment]
                }
            } result]
            set ecode $errorCode
            set einfo $errorInfo

            catch {close $fd}
        }

        file/1 {
            set fd [open $state(file) RDONLY]

            set code [catch {
                fconfigure $fd -translation binary

                while {[string length [
                    set fragment [read $fd $options(-blocksize)]]] > 0} {
                        uplevel #0 $options(-command) [list data $fragment]
                    }
            } result]
            set ecode $errorCode
            set einfo $errorInfo

            catch {close $fd}
        }

        parts/0
            -
        parts/1 {
            error "MIME part isn't a leaf"
        }

        string/0
            -
        string/1 {
            switch -- $state(encoding)/$state(canonicalP) {
                base64/0
                    -
                quoted-printable/0 {
                    set fragment [
                        $state(encoding) -mode decode -- $state(string)]
                }

                default {
                    # Not a bugfix for [#477088], but clarification
                    # This handles no-encoding, 7bit, 8bit, and binary.
                    set fragment $state(string)
                }
            }

            set code [catch {
                set cc [expr {$options(-blocksize) -1}]
                while {[string length $fragment] > $options(-blocksize)} {
                    uplevel #0 $options(-command) [
                        list data [string range $fragment 0 $cc]]

                    set fragment [
                        string range $fragment $options(-blocksize) end]
                }
                if {[string length $fragment] > 0} {
                    uplevel #0 $options(-command) [list data $fragment]
                }
            } result]
            set ecode $errorCode
            set einfo $errorInfo
        }
        default {
            error "Unknown combination \"$state(value)/$state(canonicalP)\""
        }
    }

    set code [catch {
        if {$code} {
            uplevel #0 $options(-command) [list error $result]
        } else {
            uplevel #0 $options(-command) [list end]
        }
    } result]
    set ecode $errorCode
    set einfo $errorInfo

    if {$code} {
        return -code $code -errorinfo $einfo -errorcode $ecode $result
    }

    if {$decode} {
        array set params [mime::getproperty $token params]

        if {[info exists params(charset)]} {
            set charset $params(charset)
        } else {
            set charset US-ASCII
        }

        set enc [reversemapencoding $charset]
        if {$enc ne {}} {
            set result [::encoding convertfrom $enc $result]
        } else {
            return -code error "-decode failed: can't reversemap charset $charset"
        }
    }

    return $result
}

# ::mime::getbodyaux --
#
#    Builds up the body of the message, fragment by fragment.  When
#    the entire message has been retrieved, it is returned.
#
# Arguments:
#       token      The MIME token to parse.
#       reason     One of 'data', 'end', or 'error'.
#       fragment   The section of data data fragment to extract a
#                  string from.
#
# Results:
#       Returns nothing, except when called with the 'end' argument
#       in which case it returns a string that contains all of the
#       data that 'getbodyaux' has been called with.  Will throw an
#       error if it is called with the reason of 'error'.

proc ::mime::getbodyaux {token reason {fragment {}}} {
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    switch $reason {
        data {
            append state(getbody) $fragment
            return {}
        }

        end {
            if {[info exists state(getbody)]} {
                set result $state(getbody)
                unset state(getbody)
            } else {
                set result {}
            }

            return $result
        }

        error {
            catch {unset state(getbody)}
            error $reason
        }

        default {
            error "Unknown reason \"$reason\""
        }
    }
}

# ::mime::copymessage --
#
#    mime::copymessage copies the MIME part to the specified channel.
#
#    mime::copymessage operates synchronously, and uses fileevent to
#    allow asynchronous operations to proceed independently.
#
# Arguments:
#       token      The MIME token to parse.
#       channel    The channel to copy the message to.
#
# Results:
#       Returns nothing unless an error is thrown while the message
#       is being written to the channel.

proc ::mime::copymessage {token channel} {
    global errorCode errorInfo
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    set openP [info exists state(fd)]

    set code [catch {mime::copymessageaux $token $channel} result]
    set ecode $errorCode
    set einfo $errorInfo

    if {(!$openP) && ([info exists state(fd)])} {
        if {![info exists state(root)]} {
            catch {close $state(fd)}
        }
        unset state(fd)
    }

    return -code $code -errorinfo $einfo -errorcode $ecode $result
}

# ::mime::copymessageaux --
#
#    mime::copymessageaux copies the MIME part to the specified channel.
#
# Arguments:
#       token      The MIME token to parse.
#       channel    The channel to copy the message to.
#
# Results:
#       Returns nothing unless an error is thrown while the message
#       is being written to the channel.

proc ::mime::copymessageaux {token channel} {
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    array set header $state(header)

    if {$state(version) ne {}} {
        puts $channel "MIME-Version: $state(version)"
    }
    foreach lower $state(lowerL) mixed $state(mixedL) {
        foreach value $header($lower) {
            puts $channel "$mixed: $value"
        }
    }
    if {(!$state(canonicalP)) \
            && ([set encoding $state(encoding)] ne {})} {
        puts $channel "Content-Transfer-Encoding: $encoding"
    }

    puts -nonewline $channel "Content-Type: $state(content)"
    set boundary {}
    foreach {k v} $state(params) {
        if {$k eq "boundary"} {
            set boundary $v
        }

        puts -nonewline $channel ";\n              $k=\"$v\""
    }

    set converter {}
    set encoding {}
    if {$state(value) ne "parts"} {
        puts $channel {}

        if {$state(canonicalP)} {
            if {[set encoding $state(encoding)] eq {}} {
                set encoding [encoding $token]
            }
            if {$encoding ne {}} {
                puts $channel "Content-Transfer-Encoding: $encoding"
            }
            switch -- $encoding {
                base64
                    -
                quoted-printable {
                    set converter $encoding
                }
                7bit - 8bit - binary - {} {
                    # Bugfix for [#477088], also [#539952]
                    # Go ahead
                }
                default {
                    error "Can't handle content encoding \"$encoding\""
                }
            }
        }
    } elseif {([string match multipart/* $state(content)]) \
        && ($boundary eq {})} {
        # we're doing everything in one pass...
        set key [clock seconds]$token[info hostname][array get state]
        set seqno 8
        while {[incr seqno -1] >= 0} {
            set key [md5 -- $key]
        }
        set boundary "----- =_[string trim [base64 -mode encode -- $key]]"

        puts $channel ";\n              boundary=\"$boundary\""
    } else {
        puts $channel {}
    }

    if {[info exists state(error)]} {
        unset state(error)
    }

    switch -- $state(value) {
        file {
            set closeP 1
            if {[info exists state(root)]} {
                # FRINK: nocheck
                variable $state(root)
                upvar 0 $state(root) root

                if {[info exists root(fd)]} {
                    set fd $root(fd)
                    set closeP 0
                } else {
                    set fd [set state(fd) [open $state(file) RDONLY]]
                }
                set size $state(count)
            } else {
                set fd [set state(fd) [open $state(file) RDONLY]]
                # read until eof
                set size -1
            }
            seek $fd $state(offset) start
            if {$closeP} {
                fconfigure $fd -translation binary
            }

            puts $channel {}

            while {($size != 0) && (![eof $fd])} {
                if {$size < 0 || $size > 32766} {
                    set X [read $fd 32766]
                } else {
                    set X [read $fd $size]
                }
                if {$size > 0} {
                    set size [expr {$size - [string length $X]}]
                }
                if {$converter eq {}} {
                    puts -nonewline $channel $X
                } else {
                    puts -nonewline $channel [$converter -mode encode -- $X]
                }
            }

            if {$closeP} {
                catch {close $state(fd)}
                unset state(fd)
            }
        }

        parts {
            if {(![info exists state(root)]) \
                    && ([info exists state(file)])} {
                set state(fd) [open $state(file) RDONLY]
                fconfigure $state(fd) -translation binary
            }

            switch -glob -- $state(content) {
                message/* {
                    puts $channel {}
                    foreach part $state(parts) {
                        mime::copymessage $part $channel
                        break
                    }
                }

                default {
                    # Note RFC 2046: See buildmessageaux for details.

                    foreach part $state(parts) {
                        puts $channel \n--$boundary
                        mime::copymessage $part $channel
                    }
                    puts $channel \n--$boundary--
                }
            }

            if {[info exists state(fd)]} {
                catch {close $state(fd)}
                unset state(fd)
            }
        }

        string {
            if {[catch {fconfigure $channel -buffersize} blocksize]} {
                set blocksize 4096
            } elseif {$blocksize < 512} {
                set blocksize 512
            }
            set blocksize [expr {($blocksize / 4) * 3}]

            # [893516]
            fconfigure $channel -buffersize $blocksize

            puts $channel {}

            #TODO: tests don't cover these paths
            if {$converter eq {}} {
                puts -nonewline $channel $state(string)
            } else {
                puts -nonewline $channel [$converter -mode encode -- $state(string)]
            }
        }
        default {
            error "Unknown value \"$state(value)\""
        }
    }

    flush $channel

    if {[info exists state(error)]} {
        error $state(error)
    }
}

# ::mime::buildmessage --
#
#     The following is a clone of the copymessage code to build up the
#     result in memory, and, unfortunately, without using a memory channel.
#     I considered parameterizing the "puts" calls in copy message, but
#     the need for this procedure may go away, so I'm living with it for
#     the moment.
#
# Arguments:
#       token      The MIME token to parse.
#
# Results:
#       Returns the message that has been built up in memory.

proc ::mime::buildmessage {token} {
    global errorCode errorInfo
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    set openP [info exists state(fd)]

    set code [catch {mime::buildmessageaux $token} result]
    if {![info exists errorCode]} {
        set ecode {}
    } else {
        set ecode $errorCode
    }
    set einfo $errorInfo

    if {(!$openP) && ([info exists state(fd)])} {
        if {![info exists state(root)]} {
            catch {close $state(fd)}
        }
        unset state(fd)
    }

    return -code $code -errorinfo $einfo -errorcode $ecode $result
}

# ::mime::buildmessageaux --
#
#     The following is a clone of the copymessageaux code to build up the
#     result in memory, and, unfortunately, without using a memory channel.
#     I considered parameterizing the "puts" calls in copy message, but
#     the need for this procedure may go away, so I'm living with it for
#     the moment.
#
# Arguments:
#       token      The MIME token to parse.
#
# Results:
#       Returns the message that has been built up in memory.

proc ::mime::buildmessageaux {token} {
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    array set header $state(header)

    set result {}
    if {$state(version) ne {}} {
        append result "MIME-Version: $state(version)\r\n"
    }
    foreach lower $state(lowerL) mixed $state(mixedL) {
        foreach value $header($lower) {
            append result "$mixed: $value\r\n"
        }
    }
    if {(!$state(canonicalP)) \
            && ([set encoding $state(encoding)] ne {})} {
        append result "Content-Transfer-Encoding: $encoding\r\n"
    }

    append result "Content-Type: $state(content)"
    set boundary {}
    foreach {k v} $state(params) {
        if {$k eq "boundary"} {
            set boundary $v
        }

        append result ";\r\n              $k=\"$v\""
    }

    set converter {}
    set encoding {}
    if {$state(value) ne "parts"} {
        #TODO: the path is not covered by tests
        append result \r\n

        if {$state(canonicalP)} {
            if {[set encoding $state(encoding)] eq {}} {
                set encoding [encoding $token]
            }
            if {$encoding ne {}} {
                append result "Content-Transfer-Encoding: $encoding\r\n"
            }
            switch -- $encoding {
                base64
                    -
                quoted-printable {
                    set converter $encoding
                }
                7bit - 8bit - binary - {} {
                    # Bugfix for [#477088]
                    # Go ahead
                }
                default {
                    error "Can't handle content encoding \"$encoding\""
                }
            }
        }
    } elseif {([string match multipart/* $state(content)]) \
                    && ($boundary eq {})} {
        # we're doing everything in one pass...
        set key [clock seconds]$token[info hostname][array get state]
        set seqno 8
        while {[incr seqno -1] >= 0} {
            set key [md5 -- $key]
        }
        set boundary "----- =_[string trim [base64 -mode encode -- $key]]"

        append result ";\r\n              boundary=\"$boundary\"\r\n"
    } else {
        append result \r\n
    }

    if {[info exists state(error)]} {
        unset state(error)
    }

    switch -- $state(value) {
        file {
            set closeP 1
            if {[info exists state(root)]} {
                # FRINK: nocheck
                variable $state(root)
                upvar 0 $state(root) root

                if {[info exists root(fd)]} {
                    set fd $root(fd)
                    set closeP 0
                } else {
                    set fd [set state(fd) [open $state(file) RDONLY]]
                }
                set size $state(count)
            } else {
                set fd [set state(fd) [open $state(file) RDONLY]]
                set size -1 ;# Read until EOF
            }
            seek $fd $state(offset) start
            if {$closeP} {
                fconfigure $fd -translation binary
            }

            append result \r\n

            while {($size != 0) && (![eof $fd])} {
                if {$size < 0 || $size > 32766} {
                    set X [read $fd 32766]
                } else {
                    set X [read $fd $size]
                }
                if {$size > 0} {
                    set size [expr {$size - [string length $X]}]
                }
                if {$converter ne {}} {
                    append result [$converter -mode encode -- $X]
                } else {
                    append result $X
                }
            }

            if {$closeP} {
                catch {close $state(fd)}
                unset state(fd)
            }
        }

        parts {
            if {(![info exists state(root)]) \
                    && ([info exists state(file)])} {
                set state(fd) [open $state(file) RDONLY]
                fconfigure $state(fd) -translation binary
            }

            switch -glob -- $state(content) {
                message/* {
                    append result "\r\n"
                    foreach part $state(parts) {
                        append result [buildmessage $part]
                        break
                    }
                }

                default {
                    # Note RFC 2046:
                    #
                    # The boundary delimiter MUST occur at the
                    # beginning of a line, i.e., following a CRLF, and
                    # the initial CRLF is considered to be attached to
                    # the boundary delimiter line rather than part of
                    # the preceding part.
                    #
                    # - The above means that the CRLF before $boundary
                    #   is needed per the RFC, and the parts must not
                    #   have a closing CRLF of their own. See Tcllib bug
                    #   1213527, and patch 1254934 for the problems when
                    #   both file/string brnaches added CRLF after the
                    #   body parts.

                    foreach part $state(parts) {
                        append result "\r\n--$boundary\r\n"
                        append result [buildmessage $part]
                    }
                    append result "\r\n--$boundary--\r\n"
                }
            }

            if {[info exists state(fd)]} {
                catch {close $state(fd)}
                unset state(fd)
            }
        }

        string {
            append result "\r\n"

            if {$converter ne {}} {
                append result [$converter -mode encode -- $state(string)]
            } else {
                append result $state(string)
            }
        }
        default {
            error "Unknown value \"$state(value)\""
        }
    }

    if {[info exists state(error)]} {
        error $state(error)
    }
    return $result
}

# ::mime::encoding --
#
#     Determines how a token is encoded.
#
# Arguments:
#       token      The MIME token to parse.
#
# Results:
#       Returns the encoding of the message (the null string, base64,
#       or quoted-printable).

proc ::mime::encoding {token} {
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    switch -glob -- $state(content) {
        audio/*
            -
        image/*
            -
        video/* {
            return base64
        }

        message/*
            -
        multipart/* {
            return {}
        }
        default {# Skip}
    }

    set asciiP 1
    set lineP 1
    switch -- $state(value) {
        file {
            set fd [open $state(file) RDONLY]
            fconfigure $fd -translation binary

            while {[gets $fd line] >= 0} {
                if {$asciiP} {
                    set asciiP [encodingasciiP $line]
                }
                if {$lineP} {
                    set lineP [encodinglineP $line]
                }
                if {(!$asciiP) && (!$lineP)} {
                    break
                }
            }

            catch {close $fd}
        }

        parts {
            return {}
        }

        string {
            foreach line [split $state(string) "\n"] {
                if {$asciiP} {
                    set asciiP [encodingasciiP $line]
                }
                if {$lineP} {
                    set lineP [encodinglineP $line]
                }
                if {(!$asciiP) && (!$lineP)} {
                    break
                }
            }
        }
        default {
            error "Unknown value \"$state(value)\""
        }
    }

    switch -glob -- $state(content) {
        text/* {
            if {!$asciiP} {
                #TODO: this path is not covered by tests
                foreach {k v} $state(params) {
                    if {$k eq "charset"} {
                        set v [string tolower $v]
                        if {($v ne "us-ascii") \
                                && (![string match {iso-8859-[1-8]} $v])} {
                            return base64
                        }

                        break
                    }
                }
            }

            if {!$lineP} {
                return quoted-printable
            }
        }


        default {
            if {(!$asciiP) || (!$lineP)} {
                return base64
            }
        }
    }

    return {}
}

# ::mime::encodingasciiP --
#
#     Checks if a string is a pure ascii string, or if it has a non-standard
#     form.
#
# Arguments:
#       line    The line to check.
#
# Results:
#       Returns 1 if \r only occurs at the end of lines, and if all
#       characters in the line are between the ASCII codes of 32 and 126.

proc ::mime::encodingasciiP {line} {
    foreach c [split $line {}] {
        switch -- $c {
            { } - \t - \r - \n {
            }

            default {
                binary scan $c c c
                if {($c < 32) || ($c > 126)} {
                    return 0
                }
            }
        }
    }
    if {([set r [string first \r $line]] < 0) \
            || ($r == {[string length $line] - 1})} {
        return 1
    }

    return 0
}

# ::mime::encodinglineP --
#
#     Checks if a string is a line is valid to be processed.
#
# Arguments:
#       line    The line to check.
#
# Results:
#       Returns 1 the line is less than 76 characters long, the line
#       contains more characters than just whitespace, the line does
#       not start with a '.', and the line does not start with 'From '.

proc ::mime::encodinglineP {line} {
    if {([string length $line] > 76) \
            || ($line ne [string trimright $line]) \
            || ([string first . $line] == 0) \
            || ([string first {From } $line] == 0)} {
        return 0
    }

    return 1
}

# ::mime::fcopy --
#
#    Appears to be unused.
#
# Arguments:
#
# Results:
#

proc ::mime::fcopy {token count {error {}}} {
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    if {$error ne {}} {
        set state(error) $error
    }
    set state(doneP) 1
}

# ::mime::scopy --
#
#    Copy a portion of the contents of a mime token to a channel.
#
# Arguments:
#    token     The token containing the data to copy.
#       channel   The channel to write the data to.
#       offset    The location in the string to start copying
#                 from.
#       len       The amount of data to write.
#       blocksize The block size for the write operation.
#
# Results:
#    The specified portion of the string in the mime token is
#       copied to the specified channel.

proc ::mime::scopy {token channel offset len blocksize} {
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    if {$len <= 0} {
        set state(doneP) 1
        fileevent $channel writable {}
        return
    }

    if {[set cc $len] > $blocksize} {
        set cc $blocksize
    }

    if {[catch {
        puts -nonewline $channel [
            string range $state(string) $offset [expr {$offset + $cc - 1}]]
        fileevent $channel writable [
            list mime::scopy $token $channel [
                incr offset $cc] [incr len -$cc] $blocksize]
              } result]} {

        set state(error) $result
        set state(doneP) 1
        fileevent $channel writable {}
    }
    return
}

# ::mime::qp_encode --
#
#    Tcl version of quote-printable encode
#
# Arguments:
#    string        The string to quote.
#       encoded_word  Boolean value to determine whether or not encoded words
#                     (RFC 2047) should be handled or not. (optional)
#
# Results:
#    The properly quoted string is returned.

proc ::mime::qp_encode {string {encoded_word 0} {no_softbreak 0}} {
    # 8.1+ improved string manipulation routines used.
    # Replace outlying characters, characters that would normally
    # be munged by EBCDIC gateways, and special Tcl characters "[\]{}
    # with =xx sequence

    regsub -all -- \
        {[\x00-\x08\x0B-\x1E\x21-\x24\x3D\x40\x5B-\x5E\x60\x7B-\xFF]} \
        $string {[format =%02X [scan "\\&" %c]]} string

    # Replace the format commands with their result

    set string [subst -novariables $string]

    # soft/hard newlines and other
    # Funky cases for SMTP compatibility
    set mapChars [
        list " \n" =20\n \t\n =09\n \n\.\n \=2E\n "\nFrom " "\n=46rom "]
    if {$encoded_word} {
        # Special processing for encoded words (RFC 2047)
        lappend mapChars { } _
    }
    set string [string map $mapChars $string]

    # Break long lines - ugh

    # Implementation of FR #503336
    if {$no_softbreak} {
        set result $string
    } else {
        set result {}
        foreach line [split $string \n] {
            while {[string length $line] > 72} {
                set chunk [string range $line 0 72]
                if {[regexp -- (=|=.)$ $chunk dummy end]} {

                    # Don't break in the middle of a code

                    set len [expr {72 - [string length $end]}]
                    set chunk [string range $line 0 $len]
                    incr len
                    set line [string range $line $len end]
                } else {
                    set line [string range $line 73 end]
                }
                append result $chunk=\n
            }
            append result $line\n
        }

        # Trim off last \n, since the above code has the side-effect
        # of adding an extra \n to the encoded string and return the
        # result.
        set result [string range $result 0 end-1]
    }

    # If the string ends in space or tab, replace with =xx

    set lastChar [string index $result end]
    if {$lastChar eq { }} {
        set result [string replace $result end end =20]
    } elseif {$lastChar eq "\t"} {
        set result [string replace $result end end =09]
    }

    return $result
}

# ::mime::qp_decode --
#
#    Tcl version of quote-printable decode
#
# Arguments:
#    string        The quoted-prinatble string to decode.
#       encoded_word  Boolean value to determine whether or not encoded words
#                     (RFC 2047) should be handled or not. (optional)
#
# Results:
#    The decoded string is returned.

proc ::mime::qp_decode {string {encoded_word 0}} {
    # 8.1+ improved string manipulation routines used.
    # Special processing for encoded words (RFC 2047)

    if {$encoded_word} {
        # _ == \x20, even if SPACE occupies a different code position
        set string [string map [list _ \u0020] $string]
    }

    # smash the white-space at the ends of lines since that must've been
    # generated by an MUA.

    regsub -all -- {[ \t]+\n} $string \n string
    set string [string trimright $string " \t"]

    # Protect the backslash for later subst and
    # smash soft newlines, has to occur after white-space smash
    # and any encoded word modification.

    #TODO: codepath not tested
    set string [string map [list \\ {\\} =\n {}] $string]

    # Decode specials

    regsub -all -nocase {=([a-f0-9][a-f0-9])} $string {\\u00\1} string

    # process \u unicode mapped chars

    return [subst -novariables -nocommands $string]
}

# ::mime::parseaddress --
#
#       This was originally written circa 1982 in C. we're still using it
#       because it recognizes virtually every buggy address syntax ever
#       generated!
#
#       mime::parseaddress takes a string containing one or more 822-style
#       address specifications and returns a list of serialized arrays, one
#       element for each address specified in the argument.
#
#    Each serialized array contains these properties:
#
#       property    value
#       ========    =====
#       address     [email protected]
#       comment     822-style comment
#       domain      the domain part (rhs)
#       error       non-empty on a parse error
#       group       this address begins a group
#       friendly    user-friendly rendering
#       local       the local part (lhs)
#       memberP     this address belongs to a group
#       phrase      the phrase part
#       proper      822-style address specification
#       route       822-style route specification (obsolete)
#
#    Note that one or more of these properties may be empty.
#
# Arguments:
#    string        The address string to parse
#
# Results:
#    Returns a list of serialized arrays, one element for each address
#       specified in the argument.

proc ::mime::parseaddress {string} {
    global errorCode errorInfo

    variable mime

    set token [namespace current]::[incr mime(uid)]
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    set code [catch {mime::parseaddressaux $token $string} result]
    set ecode $errorCode
    set einfo $errorInfo

    foreach name [array names state] {
        unset state($name)
    }
    # FRINK: nocheck
    catch {unset $token}

    return -code $code -errorinfo $einfo -errorcode $ecode $result
}

# ::mime::parseaddressaux --
#
#       This was originally written circa 1982 in C. we're still using it
#       because it recognizes virtually every buggy address syntax ever
#       generated!
#
#       mime::parseaddressaux does the actually parsing for mime::parseaddress
#
#    Each serialized array contains these properties:
#
#       property    value
#       ========    =====
#       address     [email protected]
#       comment     822-style comment
#       domain      the domain part (rhs)
#       error       non-empty on a parse error
#       group       this address begins a group
#       friendly    user-friendly rendering
#       local       the local part (lhs)
#       memberP     this address belongs to a group
#       phrase      the phrase part
#       proper      822-style address specification
#       route       822-style route specification (obsolete)
#
#    Note that one or more of these properties may be empty.
#
# Arguments:
#       token         The MIME token to work from.
#    string        The address string to parse
#
# Results:
#    Returns a list of serialized arrays, one element for each address
#       specified in the argument.

proc ::mime::parseaddressaux {token string} {
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    variable addrtokenL
    variable addrlexemeL

    set state(input)   $string
    set state(glevel)  0
    set state(buffer)  {}
    set state(lastC)   LX_END
    set state(tokenL)  $addrtokenL
    set state(lexemeL) $addrlexemeL

    set result {}
    while {[addr_next $token]} {
        if {[set tail $state(domain)] ne {}} {
            set tail @$state(domain)
        } else {
            set tail @[info hostname]
        }
        if {[set address $state(local)] ne {}} {
            #TODO: this path is not covered by tests
            append address $tail
        }

        if {$state(phrase) ne {}} {
            #TODO: this path is not covered by tests
            set state(phrase) [string trim $state(phrase) \"]
            foreach t $state(tokenL) {
                if {[string first $t $state(phrase)] >= 0} {
                    #TODO:  is this quoting robust enough?
                    set state(phrase) \"$state(phrase)\"
                    break
                }
            }

            set proper "$state(phrase) <$address>"
        } else {
            set proper $address
        }

        if {[set friendly $state(phrase)] eq {}} {
            #TODO: this path is not covered by tests
            if {[set note $state(comment)] ne {}} {
                if {[string first ( $note] == 0} {
                    set note [string trimleft [string range $note 1 end]]
                }
                if {[string last ) $note] \
                        == [set len [expr {[string length $note] - 1}]]} {
                    set note [string range $note 0 [expr {$len - 1}]]
                }
                set friendly $note
            }
            
            if {($friendly eq {}) \
                    && ([set mbox $state(local)] ne {})} {
                #TODO: this path is not covered by tests
                set mbox [string trim $mbox \"]

                if {[string first / $mbox] != 0} {
                    set friendly $mbox
                } elseif {[set friendly [addr_x400 $mbox PN]] ne {}} {
                } elseif {([set friendly [addr_x400 $mbox S]] ne {}) \
                    && ([set g [addr_x400 $mbox G]] ne {})} {
                    set friendly "$g $friendly"
                }

                if {$friendly eq {}} {
                    set friendly $mbox
                }
            }
        }
        set friendly [string trim $friendly \"]

        lappend result [list address  $address        \
                             comment  $state(comment) \
                             domain   $state(domain)  \
                             error    $state(error)   \
                             friendly $friendly       \
                             group    $state(group)   \
                             local    $state(local)   \
                             memberP  $state(memberP) \
                             phrase   $state(phrase)  \
                             proper   $proper         \
                             route    $state(route)]

    }

    unset state(input)   \
          state(glevel)  \
          state(buffer)  \
          state(lastC)   \
          state(tokenL)  \
          state(lexemeL)

    return $result
}

# ::mime::addr_next --
#
#       Locate the next address in a mime token.
#
# Arguments:
#       token         The MIME token to work from.
#
# Results:
#    Returns 1 if there is another address, and 0 if there is not.

proc ::mime::addr_next {token} {
    global errorCode errorInfo
    # FRINK: nocheck
    variable $token
    upvar 0 $token state
    set nocomplain [package vsatisfies [package provide Tcl] 8.4]
    foreach prop {comment domain error group local memberP phrase route} {
        if {$nocomplain} {
            unset -nocomplain state($prop)
        } else {
            if {[catch {unset state($prop)}]} {set ::errorInfo {}}
        }
    }

    switch -- [set code [catch {mime::addr_specification $token} result]] {
        0 {
            if {!$result} {
                return 0
            }

            switch -- $state(lastC) {
                LX_COMMA
                    -
                LX_END {
                }
                default {
                    # catch trailing comments...
                    set lookahead $state(input)
                    mime::parselexeme $token
                    set state(input) $lookahead
                }
            }
        }

        7 {
            set state(error) $result

            while {1} {
                switch -- $state(lastC) {
                    LX_COMMA
                        -
                    LX_END {
                        break
                    }

                    default {
                        mime::parselexeme $token
                    }
                }
            }
        }

        default {
            set ecode $errorCode
            set einfo $errorInfo

            return -code $code -errorinfo $einfo -errorcode $ecode $result
        }
    }

    foreach prop {comment domain error group local memberP phrase route} {
        if {![info exists state($prop)]} {
            set state($prop) {}
        }
    }

    return 1
}


# ::mime::addr_specification --
#
#   Uses lookahead parsing to determine whether there is another
#   valid e-mail address or not.  Throws errors if unrecognized
#   or invalid e-mail address syntax is used.
#
................................................................................
#       token         The MIME token to work from.
#
# Results:
#    Returns 1 if there is another address, and 0 if there is not.

proc ::mime::addr_specification {token} {
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    set lookahead $state(input)
    switch -- [parselexeme $token] {
        LX_ATOM
            -
        LX_QSTRING {
            set state(phrase) $state(buffer)
        }

        LX_SEMICOLON {
................................................................................

        LX_ATSIGN {
            set state(input) $lookahead
            return [addr_routeaddr $token 0]
        }

        default {
            return -code 7 \
                   [format "unexpected character at beginning (found %s)" \
                           $state(buffer)]
        }
    }

    switch -- [parselexeme $token] {
        LX_ATOM
            -
        LX_QSTRING {
            append state(phrase) " " $state(buffer)

            return [addr_phrase $token]
        }
................................................................................

        LX_SEMICOLON
            -
        LX_COMMA
            -
        LX_END {
            set state(memberP) $state(glevel)

            if {($state(lastC) eq "LX_SEMICOLON") \

                    && ([incr state(glevel) -1] < 0)} {

                #TODO: this path is not covered by tests
                return -code 7 "extraneous semi-colon"
            }

            set state(local) $state(phrase)
            unset state(phrase)
        }
................................................................................
            return -code 7 [
                format "expecting mailbox (found %s)" $state(buffer)]
        }
    }

    return 1
}


# ::mime::addr_routeaddr --
#
#       Parses the domain portion of an e-mail address.  Finds the '@'
#       sign and then calls mime::addr_route to verify the domain.
#
# Arguments:
................................................................................
#       token         The MIME token to work from.
#
# Results:
#    Returns 1 if there is another address, and 0 if there is not.

proc ::mime::addr_routeaddr {token {checkP 1}} {
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    set lookahead $state(input)
    if {[parselexeme $token] eq "LX_ATSIGN"} {
        #TODO: this path is not covered by tests
        mime::addr_route $token
    } else {
        set state(input) $lookahead
    }

    mime::addr_local $token

    switch -- $state(lastC) {
        LX_ATSIGN {
            mime::addr_domain $token
        }

        LX_SEMICOLON
            -
        LX_RBRACKET
................................................................................
    if {($checkP) && ($state(lastC) ne "LX_RBRACKET")} {
        return -code 7 [
            format "expecting right-bracket (found %s)" $state(buffer)]
    }

    return 1
}


# ::mime::addr_route --
#
#    Attempts to parse the portion of the e-mail address after the @.
#    Tries to verify that the domain definition has a valid form.
#
# Arguments:
................................................................................
#
# Results:
#    Returns nothing if successful, and throws an error if invalid
#       syntax is found.

proc ::mime::addr_route {token} {
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    set state(route) @

    while {1} {
        switch -- [parselexeme $token] {
            LX_ATOM
                -
            LX_DLITERAL {
                append state(route) $state(buffer)
            }

            default {
                return -code 7 \
                       [format "expecting sub-route in route-part (found %s)" \
                               $state(buffer)]
            }
        }

        switch -- [parselexeme $token] {
            LX_COMMA {
                append state(route) $state(buffer)
                while {1} {
                    switch -- [parselexeme $token] {
                        LX_COMMA {
                        }

                        LX_ATSIGN {
                            append state(route) $state(buffer)
                            break
                        }
................................................................................

            LX_COLON {
                append state(route) $state(buffer)
                return
            }

            default {
                return -code 7 \
                       [format "expecting colon to terminate route (found %s)" \
                               $state(buffer)]
            }
        }
    }
}


# ::mime::addr_domain --
#
#    Attempts to parse the portion of the e-mail address after the @.
#    Tries to verify that the domain definition has a valid form.
#
# Arguments:
#       token         The MIME token to work from.
#
# Results:
#    Returns nothing if successful, and throws an error if invalid
#       syntax is found.

proc ::mime::addr_domain {token} {
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    while {1} {
        switch -- [parselexeme $token] {
            LX_ATOM
                -
            LX_DLITERAL {
                append state(domain) $state(buffer)
            }

            default {
                return -code 7 \
                       [format "expecting sub-domain in domain-part (found %s)" \
                               $state(buffer)]
            }
        }

        switch -- [parselexeme $token] {
            LX_DOT {
                append state(domain) $state(buffer)
            }

            LX_ATSIGN {
                append state(local) % $state(domain)
                unset state(domain)
................................................................................

            default {
                return
            }
        }
    }
}


# ::mime::addr_local --
#
#
# Arguments:
#       token         The MIME token to work from.
#
# Results:
#    Returns nothing if successful, and throws an error if invalid
#       syntax is found.

proc ::mime::addr_local {token} {
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    set state(memberP) $state(glevel)

    while {1} {
        switch -- [parselexeme $token] {
            LX_ATOM
                -
            LX_QSTRING {
                append state(local) $state(buffer)
            }

            default {
                return -code 7 \
                       [format "expecting mailbox in local-part (found %s)" \
                               $state(buffer)]
            }
        }

        switch -- [parselexeme $token] {
            LX_DOT {
                append state(local) $state(buffer)
            }

            default {
                return
            }
        }
    }
}


# ::mime::addr_phrase --
#
#
# Arguments:
#       token         The MIME token to work from.
#
................................................................................
# Results:
#    Returns nothing if successful, and throws an error if invalid
#       syntax is found.


proc ::mime::addr_phrase {token} {
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    while {1} {
        switch -- [parselexeme $token] {
            LX_ATOM
                -
            LX_QSTRING {
                append state(phrase) " " $state(buffer)
            }

            default {
                break
            }
        }
    }

    switch -- $state(lastC) {
        LX_LBRACKET {
            return [addr_routeaddr $token]
        }

        LX_COLON {
            return [addr_group $token]
        }
................................................................................

        LX_DOT {
            append state(phrase) $state(buffer)
            return [addr_phrase $token]
        }

        default {
            return -code 7 \
                   [format "found phrase instead of mailbox (%s%s)" \
                           $state(phrase) $state(buffer)]
        }
    }
}


# ::mime::addr_group --
#
#
# Arguments:
#       token         The MIME token to work from.
#
# Results:
#    Returns nothing if successful, and throws an error if invalid
#       syntax is found.

proc ::mime::addr_group {token} {
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    if {[incr state(glevel)] > 1} {
        return -code 7 [format "nested groups not allowed (found %s)" \
                               $state(phrase)]
    }

    set state(group) $state(phrase)
    unset state(phrase)

    set lookahead $state(input)
    while {1} {
        switch -- [parselexeme $token] {
            LX_SEMICOLON
                -
            LX_END {
                set state(glevel) 0
                return 1
            }

................................................................................
            default {
                set state(input) $lookahead
                return [addr_specification $token]
            }
        }
    }
}


# ::mime::addr_end --
#
#
# Arguments:
#       token         The MIME token to work from.
#
# Results:
#    Returns nothing if successful, and throws an error if invalid
#       syntax is found.

proc ::mime::addr_end {token} {
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    switch -- $state(lastC) {
        LX_SEMICOLON {
            if {[incr state(glevel) -1] < 0} {
                return -code 7 "extraneous semi-colon"
            }
        }

        LX_COMMA
            -
        LX_END {
        }

        default {
            return -code 7 [format "junk after [email protected] (found %s)" \
                                   $state(buffer)]
        }
    }
}


# ::mime::addr_x400 --
#
#
# Arguments:
#       token         The MIME token to work from.
#
................................................................................
    if {[set x [string first / $mbox]] > 0} {
        set mbox [string range $mbox 0 [expr {$x - 1}]]
    }

    return [string trim $mbox \"]
}


































































































# ::mime::parsedatetime --
#


































































#    Fortunately the clock command in the Tcl 8.x core does all the heavy
#    lifting for us (except for timezone calculations).
#
#    mime::parsedatetime takes a string containing an 822-style date-time
#    specification and returns the specified property.
#
#    The list of properties and their ranges are:
#
#       property     range
#       ========     =====
#       clock        raw result of "clock scan"
................................................................................
        variable MONTHS_SHORT [list {} \
                                    Jan Feb Mar Apr May Jun \
                                    Jul Aug Sep Oct Nov Dec]
        variable MONTHS_LONG  [list {} \
                                    January February March April May June July \
                                    August Sepember October November December]
}
proc ::mime::parsedatetime {value property} {
    if {$value eq "-now"} {
        set clock [clock seconds]
    } elseif {[regexp {^(.*) ([+-])([0-9][0-9])([0-9][0-9])$} $value \
            -> value zone_sign zone_hour zone_min]} {
        set clock [clock scan $value -gmt 1]
        if {[info exists zone_min]} {
            set zone_min [scan $zone_min %d]
            set zone_hour [scan $zone_hour %d]
            set zone [expr {60 * ($zone_min + 60 * $zone_hour)}]
            if {$zone_sign eq "+"} {
                set zone -$zone
            }
            incr clock $zone
        }
    } else {
        set clock [clock scan $value]
    }

    switch -- $property {
        clock {
            return $clock
        }

        hour {
            set value [clock format $clock -format %H]
        }
................................................................................

        mon {
            set value [clock format $clock -format %m]
        }

        month {
            variable MONTHS_SHORT
            return [lindex $MONTHS_SHORT \
                            [scan [clock format $clock -format %m] %d]]
        }

        proper {
            set gmt [clock format $clock -format "%Y-%m-%d %H:%M:%S" \
                           -gmt true]
            if {[set diff [expr {($clock-[clock scan $gmt]) / 60}]] < 0} {
                set s -
                set diff [expr {-($diff)}]
            } else {
                set s +
            }
            set zone [format %s%02d%02d $s [
                expr {$diff / 60}] [expr {$diff % 60}]]

            variable WDAYS_SHORT
            set wday [lindex $WDAYS_SHORT [clock format $clock -format %w]]
            variable MONTHS_SHORT
            set mon [lindex $MONTHS_SHORT \
                [scan [clock format $clock -format %m] %d]]

            return [clock format $clock \
                -format "$wday, %d $mon %Y %H:%M:%S $zone"]
        }

        rclock {
            #TODO: these paths are not covered by tests
            if {$value eq "-now"} {
                return 0
            } else {
................................................................................

        zone {
            set value [string trim [string map [list \t { }] $value]]
            if {[set x [string last { } $value]] < 0} {
                return 0
            }
            set value [string range $value [expr {$x + 1}] end]
            switch -- [set s [string index $value 0]] {
                + - - {
                    if {$s eq "+"} {
                        #TODO: This path is not covered by tests
                        set s {}
                    }
                    set value [string trim [string range $value 1 end]]

                    if {([string length $value] != 4) \

                            || ([scan $value %2d%2d h m] != 2) \

                            || ($h > 12) \

                            || ($m > 59) \
                            || (($h == 12) && ($m > 0))} {



                        error "malformed timezone-specification: $value"
                    }
                    set value $s[expr {$h * 60 + $m}]
                }

                default {
                    set value [string toupper $value]
................................................................................
    if {[set value [string trimleft $value 0]] eq {}} {
        #TODO: this path is not covered by tests
        set value 0
    }
    return $value
}

















































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































# ::mime::uniqueID --
#
#    Used to generate a 'globally unique identifier' for the content-id.
#    The id is built from the pid, the current time, the hostname, and
#    a counter that is incremented each time a message is sent.

#














































































# Arguments:







#




















# Results:
#    Returns the a string that contains the globally unique identifier
#       that should be used for the Content-ID of an e-mail message.















































































































































































































































































































proc ::mime::uniqueID {} {























































































































































































































































































































    variable mime




    return "<[pid].[clock seconds].[incr mime(cid)]@[info hostname]>"




}







































































































































































# ::mime::parselexeme --
#
#    Used to implement a lookahead parser.
#
# Arguments:
#       token    The MIME token to operate on.
#
# Results:
#    Returns the next token found by the parser.

proc ::mime::parselexeme {token} {
    # FRINK: nocheck
    variable $token
    upvar 0 $token state

    set state(input) [string trimleft $state(input)]

    set state(buffer) {}
    if {$state(input) eq {}} {
        set state(buffer) end-of-input
        return [set state(lastC) LX_END]
    }

    set c [string index $state(input) 0]
    set state(input) [string range $state(input) 1 end]

    if {$c eq "("} {
        set noteP 0
        set quoteP 0

        while 1 {
            append state(buffer) $c

            #TODO: some of these paths are not covered by tests
            switch -- $c/$quoteP {
                (/0 {
                    incr noteP
                }

                \\/0 {
                    set quoteP 1
                }
................................................................................
    if {$c eq "\""} {
        set firstP 1
        set quoteP 0

        while 1 {
            append state(buffer) $c

            switch -- $c/$quoteP {
                "\\/0" {
                    set quoteP 1
                }

                "\"/0" {
                    if {!$firstP} {
                        return [set state(lastC) LX_QSTRING]
................................................................................

    if {$c eq {[}} {
        set quoteP 0

        while 1 {
            append state(buffer) $c

            switch -- $c/$quoteP {
                \\/0 {
                    set quoteP 1
                }

                ]/0 {
                    return [set state(lastC) LX_DLITERAL]
                }
................................................................................
            }
            set state(input) [string range $state(input) 1 end]
        }
    }

    if {[set x [lsearch -exact $state(tokenL) $c]] >= 0} {
        append state(buffer) $c

        return [set state(lastC) [lindex $state(lexemeL) $x]]
    }

    while {1} {
        append state(buffer) $c

        switch -- [set c [string index $state(input) 0]] {
            {} - " " - "\t" - "\n" {
                break
            }

            default {
                if {[lsearch -exact $state(tokenL) $c] >= 0} {
                    break
................................................................................

        set state(input) [string range $state(input) 1 end]
    }

    return [set state(lastC) LX_ATOM]
}

# ::mime::mapencoding --
#
#    mime::mapencodings maps tcl encodings onto the proper names for their
#    MIME charset type.  This is only done for encodings whose charset types
#    were known.  The remaining encodings return {} for now.
#
# Arguments:
#       enc      The tcl encoding to map.
#
# Results:
#    Returns the MIME charset type for the specified tcl encoding, or {}
#       if none is known.

proc ::mime::mapencoding {enc} {

    variable encodings

    if {[info exists encodings($enc)]} {
        return $encodings($enc)
    }
    return {}
}

# ::mime::reversemapencoding --
#
#    mime::reversemapencodings maps MIME charset types onto tcl encoding names.
#    Those that are unknown return {}.
#
# Arguments:
#       mimeType  The MIME charset to convert into a tcl encoding type.
#
# Results:
#    Returns the tcl encoding name for the specified mime charset, or {}
#       if none is known.

proc ::mime::reversemapencoding {mimeType} {

    variable reversemap

    set lmimeType [string tolower $mimeType]
    if {[info exists reversemap($lmimeType)]} {
        return $reversemap($lmimeType)
    }
    return {}
}














































































































































































































































































# ::mime::word_encode --
#
#    Word encodes strings as per RFC 2047.
#
# Arguments:
#       charset   The character set to encode the message to.
................................................................................
#    Returns a word encoded string.

proc ::mime::word_encode {charset method string {args}} {

    variable encodings

    if {![info exists encodings($charset)]} {
        error "unknown charset '$charset'"
    }

    if {$encodings($charset) eq {}} {
        error "invalid charset '$charset'"
    }

    if {$method ne "base64" && $method ne "quoted-printable"} {

        error "unknown method '$method', must be base64 or quoted-printable"
    }

    # default to encoded and a length that won't make the Subject header to long
    array set options [list -charset_encoded 1 -maxlength 66]
    array set options $args

    if {$options(-charset_encoded)} {
................................................................................
        return {}
    }

    set string_bytelength [string bytelength $unencoded_string]

    # the 7 is for =?, ?Q?, ?= delimiters of the encoded word
    set maxlength [expr {$options(-maxlength) - [string length $encodings($charset)] - 7}]
    switch -exact -- $method {
        base64 {
            if {$maxlength < 4} {

                error "maxlength $options(-maxlength) too short for chosen charset and encoding"
            }
            set count 0
            set maxlength [expr {($maxlength / 4) * 3}]
            while {$count < $string_length} {
                set length 0
                set enc_string {}
                while {($length < $maxlength) && ($count < $string_length)} {
                    set char [string range $unencoded_string $count $count]
                    set enc_char [::encoding convertto $charset $char]
                    if {($length + [string length $enc_char]) > $maxlength} {
                        set length $maxlength
                    } else {
                        append enc_string $enc_char
                        incr count
                        incr length [string length $enc_char]
                    }
                }
................................................................................
            # Trim off last "\n ", since the above code has the side-effect
            # of adding an extra "\n " to the encoded string.

            set result [string range $result 0 end-2]
        }
        quoted-printable {
            if {$maxlength < 1} {

                error "maxlength $options(-maxlength) too short for chosen charset and encoding"
            }
            set count 0
            while {$count < $string_length} {
                set length 0
                set encoded_word {}
                while {($length < $maxlength) && ($count < $string_length)} {
                    set char [string range $unencoded_string $count $count]
                    set enc_char [::encoding convertto $charset $char]
                    set qp_enc_char [qp_encode $enc_char 1]
                    set qp_enc_char_length [string length $qp_enc_char]
                    if {$qp_enc_char_length > $maxlength} {

                        error "maxlength $options(-maxlength) too short for chosen charset and encoding"
                    }
                    if {($length + [
                        string length $qp_enc_char]) > $maxlength} {


                        set length $maxlength
                    } else {
                        append encoded_word $qp_enc_char
                        incr count
                        incr length [string length $qp_enc_char]
                    }
                }
................................................................................
        }
        default {
            error "Can't handle content encoding \"$method\""
        }
    }
    return $result
}


# ::mime::word_decode --
#
#    Word decodes strings that have been word encoded as per RFC 2047.
#
# Arguments:
#       encoded   The word encoded string to decode.
................................................................................
#    Returns the string that has been decoded from the encoded message.

proc ::mime::word_decode {encoded} {

    variable reversemap

    if {[regexp -- {=\?([^?]+)\?(.)\?([^?]*)\?=} $encoded \
                - charset method string] != 1} {

        error "malformed word-encoded expression '$encoded'"
    }

    set enc [reversemapencoding $charset]
    if {$enc eq {}} {
        error "unknown charset '$charset'"
    }

    switch -exact -- $method {
        b -
        B {
            set method base64
        }
        q -
        Q {
            set method quoted-printable
        }
        default {
            error "unknown method '$method', must be B or Q"
        }
    }

    switch -exact -- $method {
        base64 {
            set result [base64 -mode decode -- $string]
        }
        quoted-printable {
            set result [qp_decode $string 1]
        }
        {} {
            # Go ahead
        }
        default {
            error "Can't handle content encoding \"$method\""
        }
    }

    return [list $enc $method $result]
}


# ::mime::field_decode --
#
#    Word decodes strings that have been word encoded as per RFC 2047
#    and converts the string from the original encoding/charset to UTF.
#
# Arguments:
................................................................................
    # version with unencoded equivalents.

    # Sorry about the grotesque regexp.  Most of it is sensible.  One
    # notable fudge: the final $ is needed because of an apparent bug
    # in the regexp engine where the preceding .* otherwise becomes
    # non-greedy - perhaps because of the earlier ".*?", sigh.

    while {[regexp {(.*?)(=\?(?:[^?]+)\?(?:.)\?(?:[^?]*)\?=)(.*)$} $field ignore prefix encoded field]} {


        # don't allow whitespace between encoded words per RFC 2047
        if {{} != $prefix} {
            if {![string is space $prefix]} {
                append result $prefix
            }
        }

        set decoded [word_decode $encoded]
        foreach {charset - string} $decoded break

        append result [::encoding convertfrom $charset $string]
    }

    append result $field
    return $result
}





















## One-Shot Initialization

::apply {{} {
    variable encList
    variable encAliasList
    variable reversemap


    foreach {enc mimeType} $encList {
        if {$mimeType eq {}} continue
	set reversemap([string tolower $mimeType]) $enc
    }

    foreach {enc mimeType} $encAliasList {
        set reversemap([string tolower $mimeType]) $enc
    }












    # Drop the helper variables
    unset encList encAliasList

} ::mime}






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6
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23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
..
74
75
76
77
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80


81
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83


84
85
86
87
88

89
90
91





92
93
94
95
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97
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99
100
101
102
103
104
105
...
106
107
108
109
110
111
112














113
114
115
116
117
118
119
...
313
314
315
316
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321



322



323
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326

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328


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332

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336
337


338









































































































































































































































































































































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341
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345
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355

356

357
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363
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366
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386
387
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391
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404
405
406



407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
...
427
428
429
430
431
432
433

434
435
436
437
438
439
440
441
442
443
444
...
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
...
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
...
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
...
545
546
547
548
549
550
551

552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
...
585
586
587
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590
591
592
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594
595
596
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598
599
...
601
602
603
604
605
606
607

608
609
610
611
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613
614
615
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617
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619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
...
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
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677
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679
680
681
682
683

684
685
686
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689
690
691
692
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694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
...
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730

731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
...
769
770
771
772
773
774
775

776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
...
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826

827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
...
850
851
852
853
854
855
856
857
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859
860
861
862
863
864
865
866
867
868
869
870

871
872
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876
877
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879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
...
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
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954
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960
961
962
963
964
965
966
967
968
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970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
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1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
....
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133












1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
....
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177

1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
....
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247

1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
....
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
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....
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....
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....
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....
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....
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# (c) 2000      Dan Kuchler
# (c) 2000-2001 Eric Melski
# (c) 2001      Jeff Hobbs
# (c) 2001-2008 Andreas Kupries
# (c) 2002-2003 David Welton
# (c) 2003-2008 Pat Thoyts
# (c) 2005      Benjamin Riefenstahl
# (c) 2013-2018 Poor Yorick
#
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#
# Influenced by Borenstein's/Rose's safe-tcl (circa 1993) and Darren New's
# unpublished package of 1999.
#

# new string features and inline scan are used, requiring 8.3.

# Fix for 00d04c4f12l, base64 transchan over a refchan: segmentation fault,
# requires 8.6.9
package require Tcl 8.6.9

package require {mime qp}
package require namespacex
package require tcl::chan::cat
package require tcl::chan::memchan
package require tcl::chan::string
package require {chan base}
package require {chan getslimit}
package require sha256

package provide mime 1.7

if {[catch {package require Trf 2.0}]} {

    # Fall-back to tcl-based procedures of base64 and quoted-printable encoders
    # Warning!
    # These are a fragile emulations of the more general calling sequence
    # that appears to work with this code here.
................................................................................
    unset ::major
}

#
# state variables:
#
#     canonicalP: input is in its canonical form


#     encoding: transfer encoding
#     version: MIME-version
#     header: dictionary (keys are lower-case)


#     value: either "chan" or  "parts"
#
#     file: input file
#     fd: cached file-descriptor, typically for root
#     root: token for top-level part, for (distant) subordinates

#     count: length in octets of (encoded) content
#
#     parts: list of bodies (tokens)







namespace eval ::mime {

    variable mime
    array set mime {uid 0}


    # RFC 822 lexemes
    variable addrtokenL
    lappend addrtokenL \; , < > : . ( ) @ \" \[ ] \\
    variable addrlexemeL {
        LX_SEMICOLON LX_COMMA
        LX_LBRACKET  LX_RBRACKET
................................................................................
        LX_COLON     LX_DOT
        LX_LPAREN    LX_RPAREN
        LX_ATSIGN    LX_QUOTE
        LX_LSQUARE   LX_RSQUARE
        LX_QUOTE
    }















    variable encList {
        ascii US-ASCII
        big5 Big5
        cp1250 Windows-1250
        cp1251 Windows-1251
        cp1252 Windows-1252
        cp1253 Windows-1253
................................................................................
        ksc5601 KS_C_5601-1989
        ksc5601 KSC5601
        ksc5601 korean
        shiftjis MS_Kanji
        utf-8 UTF8
    }

    namespace export {*}{
	.destroy .new body cookie datetime field_decode header mapencoding qp



	parseaddress property reversemapencoding serialize setheader uniqueID



	word_decode word_encode
    }
}































proc ::mime::addchan {token chan} {


    variable channels




    upvar 0 $token state
















































































































































































































































    upvar 0 state(fd) fd




























































































































































































































































































































































































































































































































































































































    if {[info exists fd]} {

	error [list {a channel is already present}]
    }











































































































































































































































































































    if {[$chan configure -encoding] ne {binary}} {
	$chan configure -translation auto


    }









































































































































































































































































































































    set fd $chan

































































































    incr channels($fd)















































































































































































































































































































































































































































































    return
}















































































































































































































































































































































# ::mime::addr_next --
#
#       Locate the next address in a mime token.
#
# Arguments:
#       token         The MIME token to work from.
#
# Results:
#    Returns 1 if there is another address, and 0 if there is not.

proc ::mime::addr_next token {

    # FRINK: nocheck

    upvar 0 $token state
    set nocomplain [package vsatisfies [package provide Tcl] 8.4]
    foreach prop {comment domain error group local memberP phrase route} {
        if {$nocomplain} {
            unset -nocomplain state($prop)
        } else {
            catch {unset state($prop)}
        }
    }

    switch [set code [catch {mime::addr_specification $token} result copts]] {
        0 {
            if {!$result} {
                return 0
            }

            switch $state(lastC) {
                LX_COMMA
                    -
                LX_END {
                }
                default {
                    # catch trailing comments...
                    set lookahead $state(input)
                    parselexeme $token
                    set state(input) $lookahead
                }
            }
        }

        7 {
            set state(error) $result

            while 1 {
                switch $state(lastC) {
                    LX_COMMA
                        -
                    LX_END {
                        break
                    }

                    default {
                        parselexeme $token
                    }
                }
            }
        }

        default {
            return -options $copts $result



        }
    }

    foreach prop {comment domain error group local memberP phrase route} {
        if {![info exists state($prop)]} {
            set state($prop) {}
        }
    }

    return 1
}


# ::mime::addr_specification --
#
#   Uses lookahead parsing to determine whether there is another
#   valid e-mail address or not.  Throws errors if unrecognized
#   or invalid e-mail address syntax is used.
#
................................................................................
#       token         The MIME token to work from.
#
# Results:
#    Returns 1 if there is another address, and 0 if there is not.

proc ::mime::addr_specification {token} {
    # FRINK: nocheck

    upvar 0 $token state

    set lookahead $state(input)
    switch [parselexeme $token] {
        LX_ATOM
            -
        LX_QSTRING {
            set state(phrase) $state(buffer)
        }

        LX_SEMICOLON {
................................................................................

        LX_ATSIGN {
            set state(input) $lookahead
            return [addr_routeaddr $token 0]
        }

        default {
            return -code 7 [
		format "unexpected character at beginning (found %s)" \
		   $state(buffer)]
        }
    }

    switch [parselexeme $token] {
        LX_ATOM
            -
        LX_QSTRING {
            append state(phrase) " " $state(buffer)

            return [addr_phrase $token]
        }
................................................................................

        LX_SEMICOLON
            -
        LX_COMMA
            -
        LX_END {
            set state(memberP) $state(glevel)
            if {
		$state(lastC) eq "LX_SEMICOLON"
		&&
		([incr state(glevel) -1] < 0)
	    } {
                #TODO: this path is not covered by tests
                return -code 7 "extraneous semi-colon"
            }

            set state(local) $state(phrase)
            unset state(phrase)
        }
................................................................................
            return -code 7 [
                format "expecting mailbox (found %s)" $state(buffer)]
        }
    }

    return 1
}


# ::mime::addr_routeaddr --
#
#       Parses the domain portion of an e-mail address.  Finds the '@'
#       sign and then calls mime::addr_route to verify the domain.
#
# Arguments:
................................................................................
#       token         The MIME token to work from.
#
# Results:
#    Returns 1 if there is another address, and 0 if there is not.

proc ::mime::addr_routeaddr {token {checkP 1}} {
    # FRINK: nocheck

    upvar 0 $token state

    set lookahead $state(input)
    if {[parselexeme $token] eq "LX_ATSIGN"} {
        #TODO: this path is not covered by tests
        mime::addr_route $token
    } else {
        set state(input) $lookahead
    }

    mime::addr_local $token

    switch $state(lastC) {
        LX_ATSIGN {
            mime::addr_domain $token
        }

        LX_SEMICOLON
            -
        LX_RBRACKET
................................................................................
    if {($checkP) && ($state(lastC) ne "LX_RBRACKET")} {
        return -code 7 [
            format "expecting right-bracket (found %s)" $state(buffer)]
    }

    return 1
}


# ::mime::addr_route --
#
#    Attempts to parse the portion of the e-mail address after the @.
#    Tries to verify that the domain definition has a valid form.
#
# Arguments:
................................................................................
#
# Results:
#    Returns nothing if successful, and throws an error if invalid
#       syntax is found.

proc ::mime::addr_route {token} {
    # FRINK: nocheck

    upvar 0 $token state

    set state(route) @

    while 1 {
        switch [parselexeme $token] {
            LX_ATOM
                -
            LX_DLITERAL {
                append state(route) $state(buffer)
            }

            default {
                return -code 7 \
                       [format "expecting sub-route in route-part (found %s)" \
                               $state(buffer)]
            }
        }

        switch [parselexeme $token] {
            LX_COMMA {
                append state(route) $state(buffer)
                while 1 {
                    switch [parselexeme $token] {
                        LX_COMMA {
                        }

                        LX_ATSIGN {
                            append state(route) $state(buffer)
                            break
                        }
................................................................................

            LX_COLON {
                append state(route) $state(buffer)
                return
            }

            default {
                return -code 7 [
		    format "expecting colon to terminate route (found %s)" \
			$state(buffer)]
            }
        }
    }
}


# ::mime::addr_domain --
#
#    Attempts to parse the portion of the e-mail address after the @.
#    Tries to verify that the domain definition has a valid form.
#
# Arguments:
#       token         The MIME token to work from.
#
# Results:
#    Returns nothing if successful, and throws an error if invalid
#       syntax is found.

proc ::mime::addr_domain token {
    # FRINK: nocheck

    upvar 0 $token state

    while 1 {
        switch [parselexeme $token] {
            LX_ATOM
                -
            LX_DLITERAL {
                append state(domain) $state(buffer)
            }

            default {
                return -code 7 [
		    format "expecting sub-domain in domain-part (found %s)" \
			$state(buffer)]
            }
        }

        switch [parselexeme $token] {
            LX_DOT {
                append state(domain) $state(buffer)
            }

            LX_ATSIGN {
                append state(local) % $state(domain)
                unset state(domain)
................................................................................

            default {
                return
            }
        }
    }
}


# ::mime::addr_local --
#
#
# Arguments:
#       token         The MIME token to work from.
#
# Results:
#    Returns nothing if successful, and throws an error if invalid
#       syntax is found.

proc ::mime::addr_local {token} {
    # FRINK: nocheck

    upvar 0 $token state

    set state(memberP) $state(glevel)

    while 1 {
        switch [parselexeme $token] {
            LX_ATOM
                -
            LX_QSTRING {
                append state(local) $state(buffer)
            }

            default {
                return -code 7 \
                       [format "expecting mailbox in local-part (found %s)" \
                               $state(buffer)]
            }
        }

        switch [parselexeme $token] {
            LX_DOT {
                append state(local) $state(buffer)
            }

            default {
                return
            }
        }
    }
}


# ::mime::addr_phrase --
#
#
# Arguments:
#       token         The MIME token to work from.
#
................................................................................
# Results:
#    Returns nothing if successful, and throws an error if invalid
#       syntax is found.


proc ::mime::addr_phrase {token} {
    # FRINK: nocheck

    upvar 0 $token state

    while 1 {
        switch [parselexeme $token] {
            LX_ATOM
                -
            LX_QSTRING {
                append state(phrase) " " $state(buffer)
            }

            default {
                break
            }
        }
    }

    switch $state(lastC) {
        LX_LBRACKET {
            return [addr_routeaddr $token]
        }

        LX_COLON {
            return [addr_group $token]
        }
................................................................................

        LX_DOT {
            append state(phrase) $state(buffer)
            return [addr_phrase $token]
        }

        default {
            return -code 7 [
		format "found phrase instead of mailbox (%s%s)" \
		    $state(phrase) $state(buffer)]
        }
    }
}


# ::mime::addr_group --
#
#
# Arguments:
#       token         The MIME token to work from.
#
# Results:
#    Returns nothing if successful, and throws an error if invalid
#       syntax is found.

proc ::mime::addr_group {token} {
    # FRINK: nocheck

    upvar 0 $token state

    if {[incr state(glevel)] > 1} {
        return -code 7 [
	    format "nested groups not allowed (found %s)" $state(phrase)]
    }

    set state(group) $state(phrase)
    unset state(phrase)

    set lookahead $state(input)
    while 1 {
        switch [parselexeme $token] {
            LX_SEMICOLON
                -
            LX_END {
                set state(glevel) 0
                return 1
            }

................................................................................
            default {
                set state(input) $lookahead
                return [addr_specification $token]
            }
        }
    }
}


# ::mime::addr_end --
#
#
# Arguments:
#       token         The MIME token to work from.
#
# Results:
#    Returns nothing if successful, and throws an error if invalid
#       syntax is found.

proc ::mime::addr_end {token} {
    # FRINK: nocheck

    upvar 0 $token state

    switch $state(lastC) {
        LX_SEMICOLON {
            if {[incr state(glevel) -1] < 0} {
                return -code 7 "extraneous semi-colon"
            }
        }

        LX_COMMA
            -
        LX_END {
        }

        default {
            return -code 7 [
		format "junk after [email protected] (found %s)" $state(buffer)]
        }
    }
}


# ::mime::addr_x400 --
#
#
# Arguments:
#       token         The MIME token to work from.
#
................................................................................
    if {[set x [string first / $mbox]] > 0} {
        set mbox [string range $mbox 0 [expr {$x - 1}]]
    }

    return [string trim $mbox \"]
}


proc ::mime::checkinputs {} {
    upvar 1 inputs inputs
    if {[incr inputs] > 1} {
	error [list {more than one input source provided}]
    }
}


proc ::mime::body_decoded _ {
    set token [$_ token]
    upvar 0 $token state
    upvar 0 state(bodychandecoded) bodychandecoded
    $_ parsepart
    if {[info exists state(parts)]} {
	error [list {not a leaf part} $token]
    }
    if {$state(canonicalP)} { 
	$state(fd) seek 0 
	return $state(fd)
    } else {
	if {![info exists bodychandecoded]} {
	    set bodychandecoded [::tcllib::chan::base .new [
		info cmdcount]_bodydecoded [file tempfile]]
	    $bodychandecoded configure -translation binary
	    $state(bodychan) seek 0
	    $state(bodychan) copy [$bodychandecoded $ chan]
	    $bodychandecoded seek 0
	    $state(bodychan) seek 0
	    setencoding $token $bodychandecoded
	    setcharset $_ $bodychandecoded
	}
	$bodychandecoded seek 0
	return $bodychandecoded
    }
}

proc ::mime::body_raw _ {
    set token [$_ token]
    upvar 0 $token state
    $_ parsepart
    if {[info exists state(parts)]} {
	error [list {not a leaf part} $token]
    }
    if {$state(canonicalP)} { 
	$state(fd) seek 0
	return $state(fd)
    } else {
	$state(bodychan) seek 0 
	return $state(bodychan)
    }
}


namespace eval ::mime::body {
    namespace ensemble create -parameters token
    namespace export *
    namespacex import [namespace parent] body_decoded decoded body_raw raw
}


proc ::mime::contenttype _ {
    set token [$_ token]
    upvar 0 $token state
    try {
	$_ header get content-type
    } on error {cres copts} {
	# rfc 2045 5.2
	try {
	    if {header::exists $token MIME-Version} {
		    return text/plain
	    } else {
		switch $state(spec) {
		    cgi - http {
			return {text/html {charset UTF-8}}
		    }
		    mime {
			# do not specify US-ASCII here as it is the default
			return text/plain
		    }
		    
		}
	    }
	} on error {} {
	    return application/octet-stream
	}
    }
}

proc ::mime::cookie_delete {_ name args} {
    # this -expires overrides any that might be in $args
    $_ cookie set value {} {*}$args expires [
	format 0 -timezone :UTC -format {%a, %d %b %Y %H:%M:%S %z}]
    return
}


# ::mime::cookie_set
#
#	Set a return cookie.  You must call this before you call
#	ncgi::header or ncgi::redirect
#
# Arguments:
#	args	Name value pairs, where the names are:
#		name		Cookie name
#		value		Cookie value
#		?path?		Path restriction
#		?domain?	domain restriction
#		?expires?	Time restriction
#		?httponly?	boolean, default true

#
# Side Effects:
#	Formats and stores the Set-Cookie header for the reply.

proc ::mime::cookie_set {_ name value args} {
    dict size $args
    foreach {key val} $args {
	switch $key {
	    domain - expires - httponly - path {
		set $key $val
	    }
	    default {
		error [list {wrong # args} {should be} \
		    [list name value ?path path? ?domain domain? \
			?expires date? ?httponly boolean?]]
	    }
	}
    }
    set line $name=$value
    set params {}
    set flags {}
    foreach extra {path domain} {
	if {[info exists $extra]} {
	    lappend params $extra [set $extra]
	}
    }
    if {[info exists expires]} {
	switch -glob $expires {
	    *GMT {
		# do nothing
	    }
	    default {
		set expires [clock format [datetimescan $expires] \
		    -format {%A, %d-%b-%Y %H:%M:%S GMT} -gmt 1]
	    }
	}
	lappend params expires $expires
    }
    if {[info exists secure]} {
	lappend flags secure
    }
    if {![info exists httponly] || $httponly} {
	lappend flags HttpOnly
    }
    if {[llength $flags]} {
	lappend params $flags
    }
    $_ header set Set-Cookie $line $params 
    return
}


# ::mime::datetime --
#
#    Fortunately the clock command in the Tcl 8.x core does all the heavy
#    lifting for us (except for timezone calculations).
#
#    mime::datetime takes a string containing an 822-style date-time
#    specification and returns the specified property.
#
#    The list of properties and their ranges are:
#
#       property     range
#       ========     =====
#       clock        raw result of "clock scan"
................................................................................
        variable MONTHS_SHORT [list {} \
                                    Jan Feb Mar Apr May Jun \
                                    Jul Aug Sep Oct Nov Dec]
        variable MONTHS_LONG  [list {} \
                                    January February March April May June July \
                                    August Sepember October November December]
}
proc ::mime::datetime {value property} {
    if {$value eq {-now}} {
        set clock [clock seconds]












    } else {
        set clock [datetimescan $value]
    }

    switch $property {
        clock {
            return $clock
        }

        hour {
            set value [clock format $clock -format %H]
        }
................................................................................

        mon {
            set value [clock format $clock -format %m]
        }

        month {
            variable MONTHS_SHORT
            return [lindex $MONTHS_SHORT [
		scan [clock format $clock -format %m] %d]]
        }

        proper {
            set gmt [clock format $clock -format "%Y-%m-%d %H:%M:%S" -gmt true]

            if {[set diff [expr {($clock-[clock scan $gmt]) / 60}]] < 0} {
                set s -
                set diff [expr {-($diff)}]
            } else {
                set s +
            }
            set zone [format %s%02d%02d $s [
                expr {$diff / 60}] [expr {$diff % 60}]]

            variable WDAYS_SHORT
            set wday [lindex $WDAYS_SHORT [clock format $clock -format %w]]
            variable MONTHS_SHORT
            set mon [lindex $MONTHS_SHORT [
		scan [clock format $clock -format %m] %d]]

            return [
		clock format $clock -format "$wday, %d $mon %Y %H:%M:%S $zone"]
        }

        rclock {
            #TODO: these paths are not covered by tests
            if {$value eq "-now"} {
                return 0
            } else {
................................................................................

        zone {
            set value [string trim [string map [list \t { }] $value]]
            if {[set x [string last { } $value]] < 0} {
                return 0
            }
            set value [string range $value [expr {$x + 1}] end]
            switch [set s [string index $value 0]] {
                + - - {
                    if {$s eq "+"} {
                        #TODO: This path is not covered by tests
                        set s {}
                    }
                    set value [string trim [string range $value 1 end]]
                    if {(
			    [string length $value] != 4)
			||
			    [scan $value %2d%2d h m] != 2
			||
			    $h > 12
			||
			    $m > 59

			||
			    ($h == 12 && $m > 0)
		    } {
                        error "malformed timezone-specification: $value"
                    }
                    set value $s[expr {$h * 60 + $m}]
                }

                default {
                    set value [string toupper $value]
................................................................................
    if {[set value [string trimleft $value 0]] eq {}} {
        #TODO: this path is not covered by tests
        set value 0
    }
    return $value
}


proc ::mime::datetimescan value {
    variable timeformats
    foreach format $timeformats {
	if {![catch {clock scan $value -format $format} cres copts]} break
    }
    return -options $copts $cres
}


# ::mime::encoding --
#
#     Determines how a token is encoded.
#
# Arguments:
#       token
#            The MIME token to parse.
#
# Results:
#       Returns the encoding of the message (the null string, base64,
#       or quoted-printable).

proc ::mime::encoding _ {
    set token [$_ token]
    # FRINK: nocheck
    upvar 0 $token state
    upvar 0 state(fd) chan state(params) params

    if {[info exists state(encoding)]} {
	return $state(encoding)
    }
    lassign [$_ contenttype] content

    switch -glob $content {
        audio/*
            -
        image/*
            -
        video/* {
            return [set state(encoding) base64]
        }

        message/*
            -
        multipart/* {
            return [set state(encoding) {}]
        }
        default {# Skip}
    }

    set asciiP 1
    set lineP 1
    if {[info exists state(parts)]} {
	return [set state(encoding) {}]
    }

    if {[set current [$chan tell]] < 0} {
	makeseekable $token
	set current [$chan tell]
    }
    set chanconfig [$chan configure]
    try {
	set buf {}
	set dataend 0
	while {[set data [$chan read 8192]] ne {} || $buf ne {}} {
	    if {$data eq {}} {
		set dataend 1
	    }
	    set data $buf[set buf {}]$data[set data{}]
	    set lines [split $data \n]
	    if {!$dataend} {
		set buf [lindex $lines end]
		set lines [lrange $lines[set lines {}] 0 end-1]
	    }
	    if {[llength $lines]} {
		if {$asciiP} {
		    set asciiP [encodingasciiP $lines]
		}
		if {$lineP} {
		    set lineP [encodinglineP $lines]
		}
		if {(!$asciiP) && (!$lineP)} {
		    break
		}
	    }
	}
    } finally {
	$chan configure {*}$chanconfig
	$chan seek 0
    }

    switch -glob $content {
        text/* {
            if {!$asciiP} {
                #TODO: this path is not covered by tests
		if {[dict exists $params charset]} {
		    set v [string tolower [dict get $params $charset]]
		    if {($v ne {us-ascii}) \
			    && (![string match {iso-8859-[1-8]} $v])} {
			return [set state(encoding) base64]
		    }
		}
            }

            if {!$lineP} {
                return [set state(encoding) quoted-printable]
            }
        }


        default {
            if {(!$asciiP) || (!$lineP)} {
                return [set state(encoding) base64]
            }
        }
    }
    return [set state(encoding) {}]
}

# ::mime::encodingasciiP --
#
#     Checks if a string is a pure ascii string, or if it has a non-standard
#     form.
#
# Arguments:
#       line    The line to check.
#
# Results:
#       Returns 1 if \r only occurs at the end of lines, and if all
#       characters in the line are between the ASCII codes of 32 and 126.

proc ::mime::encodingasciiP lines {
    foreach line $lines {
	set firstr [string first \r $line]]
	if {
	    $firstr > 0 && $first != [string length $line]
	} {
	    return 0
	}
	foreach c [split $line {}] {
	    switch $c {
		{ } - \t - \r - \n {
		}

		default {
		    binary scan $c c c
		    if {($c < 32) || ($c > 126)} {
			return 0
		    }
		}
	    }
	}
    }
    return 1
}

# ::mime::encodinglineP --
#
#     Checks if a string is a line is valid to be processed.
#
# Arguments:
#       line    The line to check.
#
# Results:
#       Returns 1 the line is less than 76 characters long, the line
#       contains more characters than just whitespace, the line does
#       not start with a '.', and the line does not start with 'From '.

proc ::mime::encodinglineP lines {
    foreach line $line {
	if {([string length $line] > 76) \
		|| ($line ne [string trimright $line]) \
		|| ([string first . $line] == 0) \
		|| ([string first {From } $line] == 0)} {
	    return 0
	}
    }
    return 1
}


proc ::mime::contentid _ {
    set token [$_ token]
    upvar 0 $token state
    upvar 0 state(parts) parts
    $_ parsepart
    if {[info exists parts]} {
	foreach part $parts {
	    upvar 0 $part childpart
	    set created 0
	    if {![header::exists $part message-id]} {
		set created 1
		header::setinternal $part Message-ID [messageid $part]
	    }

	    # use message-id here, not content-id, to account for header info
	    # in the parts
	    append ids [$part header get message-id] 

	    if {$created} {
		if {!$childpart(addmessageid)} {
		    header::unset $part message-id
		}
	    }
	}
	set id [::sha2::sha256 -hex $ids]
    } else {
	set chan [$_ body decoded]
	set config [$chan configure]
	if {[dict exists $config -chan]} {
	    dict unset config -chan
	}
	try {
	    $chan seek 0
	    set id [::sha2::sha256 -hex -channel [$chan configure -chan]]
	    $chan seek 0
	} finally {
	    $chan configure {*}$config
	}
    }
    return [email protected]|
}


proc ::mime::dropchan token {
    variable channels
    upvar 0 $token state
    upvar 0 state(fd) fd

    if {[info exists fd]} {
	if {[incr channels($fd) -1] == 0} {
	    unset channels($fd)
	    if {$state(closechan)} {
		$fd close
	    }
	}
	unset state(fd)
    }
}


# ::mime::.destroy --
#
#   mime::.destroy destroys a MIME part.
#
#   If the -subordinates option is present, it specifies which
#   subordinates should also be destroyed. The default value is
#   "dynamic".
#
# Arguments:
#       token  The MIME token to parse.
#       args   Args can be optionally be of the following form:
#              ?-subordinates "all" | "dynamic" | "none"?
#
# Results:
#       Returns an empty string.

proc ::mime::.destroy {token args} {
    # FRINK: nocheck
    upvar 0 $token state
    array set options [list -subordinates dynamic]
    array set options $args

    set ensemble $state(ensemble)

    switch $options(-subordinates) {
        all {
            #TODO: this code path is untested
            if {[info exists state(parts)]} {
                foreach part $state(parts) {
		    $part .destroy
                }
            }
        }

        dynamic {
	    foreach part $state(dynamic) {
		$part .destroy
	    }
        }

        none {
        }

        default {
            error "unknown value for -subordinates $options(-subordinates)"
        }
    }

    dropchan $token

    if {$state(bodychan) ne {}} {
	if {[$state(bodychan) configure -chan] in [chan names]} {
	    rename $state(bodychan) {}
	}
    }

    if {[info exists state(bodychandecoded)]} {
	rename $state(bodychandecoded) {}
    }

    foreach name [array names state] {
        unset state($name)
    }

    if {[namespace which $ensemble] ne {}} {
	rename $ensemble {}
	# FRINK: nocheck
    }
    unset $token
}


proc ::mime::messageid _ {
    set token [$_ token]
    upvar 0 $token state
    #set unique [uniqueID]
    if {![header::exists $token content-id] && $state(addcontentid)} {
	header::setinternal $token Content-ID [contentid $_]
    }
    set sha [::sha2::SHA256Init]
    foreach {key val} [lsort -stride 2 [$_ header get]] {
	lassign $val value params
	::sha2::SHA256Update $sha $key$value
	foreach {pkey pval} $params {
	    ::sha2::SHA256Update $sha $pkey$pval
	}
    }
    set hash [::sha2::SHA256Final $sha]
    binary scan $hash H* hex
    return [email protected]|
}

# ::mime::mimegets --
#
#    like [gets] but does not run over multipart boundaries
#
#    only needed during the parsing stage, since after that the content of each
#    part is in a separate file
#
# Arguments:
#       token      The MIME token to parse.
#
# Results:
#       Returns the size in bytes of the MIME token.
proc ::mime::mimegets {token varname} {
    upvar 0 $token state
    upvar 0 state(boundary) boundary state(eof) eof
    upvar 1 $varname line
    if {$eof} {
	set line {}
	return -1
    }
    set res [$state(fd) gets line]
    if {$res == -1} {
	set eof 1
	set line {}
	return -1
    } else {
	set found [string first --$boundary $line]
	if {$found == 0} {
	    if {[string first --$boundary-- $line] >= 0} {
		set state(sawclosing) 1
		set eof 1
	    }
	    set line {}
	    return -1 
	}
	return $res
    }
}

# ::mime::getsize --
#
#    Determine the size (in bytes) of a MIME part/token
#
# Arguments:
#       token      The MIME token to parse.
#
# Results:
#       Returns the size in bytes of the MIME token.

proc ::mime::getsize _ {
    set token [$_ token]
    # FRINK: nocheck
    upvar 0 $token state
    upvar 0 state(bodychan) bodychan state(fd) inputchan 

    $_ parsepart

    if {[info exists state(parts)]} {
	set size 0
	foreach part $state(parts) {
	    incr size [getsize $part]
	}
    } else {
	set size 0
	if {$state(canonicalP)} {
	    if {[set current [$inputchan tell]] < 0} {
		makeseekable $token
	    }
	    set current [$inputchan tell]
	    $inputchan seek 0 end
	    set size [$inputchan tell]
	    $inputchan seek $current
	} else {
	    set size $state(size)
	}
    }
    # no longer needed since size is calculated during parsing
    #if {$state(encoding) eq {base64}} {
    #    set size [expr {($size * 3 + 2) / 4}]
    #}
    return $size
}


proc ::mime::getTransferEncoding _ {
    set token [$_ token]
    upvar 0 $token state
    # not the global [encoding]
    set encoding [encoding $_]
    # See also issues [#477088] and [#539952]
    switch $encoding {
	base64 - quoted-printable  - 7bit - 8bit - binary - {} {
	}
	default {
	    error [list {Can't handle content encoding} $encoding]
	}
    }
    return $encoding
}


namespace eval ::mime::header {
    variable tchar
    # hypen is first for inclusion in brackets
    variable tchar_re {-!#$%&'*+.^`|~0-9A-Za-z}
    variable token_re "^(\[$tchar_re]*)\\s*(?:;|$)?"
    variable notattchar_re "\[^[string map {* {} ' {} % {}} $tchar_re]]"

    # RFC 2045 lexemes
    variable typetokenL
    lappend typetokenL \; , < > : ? ( ) @ \" \[ ] = / \\
    variable typelexemeL {
        LX_SEMICOLON LX_COMMA
        LX_LBRACKET  LX_RBRACKET
        LX_COLON     LX_QUESTION
        LX_LPAREN    LX_RPAREN
        LX_ATSIGN    LX_QUOTE
        LX_LSQUARE   LX_RSQUARE
        LX_EQUALS    LX_SOLIDUS
        LX_QUOTE
    }

    variable internal 0
}


proc ::mime::header::boundary {} {
    return [uniqueID]
}


# ::mime::dunset --
#
#   Unset all values for $key, without "normalizing" other redundant keys
proc ::mime::header::dunset {dictname key} {
    upvar 1 $dictname dict
    set dict [join [lmap {key1 val} $dict[set dict {}] {
	if {$key1 eq $key} continue
	list $key1 $val
    }]]
}


proc ::mime::header::exists {token name} {
    upvar 0 $token state
    set lname [string tolower $name]
    expr {[dict exists $state(headerlower) $lname]
		|| [dict exists $state(headerinternallower) $lname]
		|| [dict exists $state(contentidlower) $lname]
		|| [dict exists $state(messageidlower) $lname]
    }
}


# ::mime::header get --
#
#    Returns the header of a message as a multidict where each value is a list
#    containing the header value and a dictionary parameters for that header.

#    If $key is provided, returns only the value and paramemters of the last
#    maching header, without regard for case. 
#
#    If -names is specified, a list of all header names is returned.
#

proc ::mime::header::get {_ {key {}}} {
    set token [$_ token]
    # FRINK: nocheck
    upvar 0 $token state
    parse $token

    set contentid $state(contentid)
    set contentidlower $state(contentidlower)
    set header $state(header)
    set headerlower $state(headerlower)
    set headerinternal $state(headerinternal)
    set headerinternallower $state(headerinternallower)
    set messageid $state(messageid) 
    set messageidlower $state(messageidlower)
    switch $key {
	{} {
	    set result [list {*}$messageid {*}$contentid {*}$headerinternal \
		{*}$header]
	    if {![dict exists $headerlower content-transfer-encoding]
		&& !$state(canonicalP)} {
		set tencoding [getTransferEncoding $_]
		if {$tencoding ne {}} {
		    lappend result Content-Transfer-Encoding [list $tencoding {}]
		}
	    }
	    return $result
	}

	-names {
	    return [dict keys $header]
	}

	default {
	    set lower [string tolower $key]

	    switch $lower {
		content-id {
		    if {![dict size $contentidlower]} {
			contentid $token
		    }
		    return [dict get $contentidlower content-id]
		}
		content-transfer-encoding {
		    if {[dict exists $headerinternallower $lower]} {
			return [dict get $headerinternallower $lower]
		    } elseif {!$state(canonicalP)} {
			return [list [getTransferEncoding $_] {}]
		    } else {
			error [list {no such header} $key]
		    }
		}
		message-id {
		    if {![dict size $messageidlower]} {
			setinternal $token Message-ID [[namespace parent]::messageid $_]
		    }
		    return [dict get $messageidlower message-id]
		}
		mime-version {
		    return [list $state(version) {}]
		}
		default {
		    set res {}
		    if {[dict exists $headerinternallower $lower]} {
			return [dict get $headerinternallower $lower]
		    } elseif {[dict exists $headerlower $lower]} {
			return [dict get $headerlower $lower]
		    } else {
			error [list {no such header} $key]
		    }
		}
	    }
	}
    }
}


proc ::mime::header::parse token {
    # FRINK: nocheck
    upvar 0 $token state
    upvar 0 state(fd) fd state(boundary) boundary
    if {$state(canonicalP) || $state(headerparsed)} {
	return
    }
    set state(headerparsed) 1

    if {[info exists boundary]} {
	set gets [list [namespace parent]::mimegets $token line]
    } else {
	set gets [list $fd gets line]
    }

    set vline {}
    while 1 {
	set blankP 0
	set x [{*}$gets]
	if {$x <= 0} {
	    set blankP 1
	}

	# to do 2018-11-13: probably remove this now that line translation
	# happens automatically,
	if {!$blankP && [string match *\r $line]} {
	    set line [string range $line 0 $x-2]
	    if {$x == 1} {
		set blankP 1
	    }
	}

	# there is a space and a tab between the brackets in next line
        if {!$blankP && [string match {[ 	]*} $line]} {
            append vline { } [string trimleft $line " \t"]
            continue
        }

        if {$vline eq {}} {
            if {$blankP} {
                break
            }

            set vline $line
            continue
        }

        if {
	    [set x [string first : $vline]] <= 0
	    ||
	    [set mixed [string trimright [
		string range $vline 0 [expr {$x - 1}]]]] eq {}
	} {
            error [list {improper line in header} $vline]
        }
        set value [string trim [string range $vline [expr {$x + 1}] end]]

        switch [set lower [string tolower $mixed]] {
	    content-disposition {
		set_ $token $mixed {*}[parseparts $token $value]
	    }

	    content-id {
		setinternal $token $mixed $value
	    }

            content-type {
                if {[exists $token content-type]} {
                    error [list {multiple Content-Type fields starting with} \
			$vline]
                }

                set x [parsetype $token $value]
		setinternal $token Content-Type {*}$x
            }

            content-md5 {
            }

            content-transfer-encoding {
                if {
		    $state(encoding) ne {}
		    &&
		    $state(encoding) ne [string tolower $value]
		} {
                    error [list [list multiple Content-Transfer-Encoding \
			fields starting with] $vline]
                }

                set state(encoding) [string tolower $value]
            }

            mime-version {
                set state(version) $value
            }

            default {
		set_ $token $mixed $value -mode append
            }
        }

        if {$blankP} {
            break
        }
        set vline $line
    }
}


proc ::mime::header::parseparams token {
    # FRINK: nocheck
    upvar 0 $token state
    set params {}

    while 1 {
        switch [parselexeme $token] {
            LX_END {
		return [processparams $params[set params {}]]
            }

	    LX_SEMICOLON {
		if {[dict size $params]} {
		    continue
		} else {
		    error [list {expecting attribute} not $state(buffer)]
		}
	    }

            LX_ATOM {
            }

            default {
                error [list {expecting attribute} not $state(buffer)]
            }
        }

        set attribute [string tolower $state(buffer)]

        if {[parselexeme $token] ne {LX_EQUALS}} {
            error [list expecting = found  $state(buffer)]
        }

        switch [parselexeme $token] {
            LX_ATOM {
            }

            LX_QSTRING {
                set state(buffer) [
                    string range $state(buffer) 1 [
                        expr {[string length $state(buffer)] - 2}]]
		set state(buffer) [unquote $state(buffer)]
            }

            default {
                error [list expecting value found $state(buffer)]
            }
        }
        dict set params $attribute $state(buffer)
    }
}


proc ::mime::header::parseparts {token value} {
    variable token_re
    upvar 0 $token state

    if {![regexp $token_re $value match type]} {
	error [list {expected disposition-type}]
    }

    variable typetokenL
    variable typelexemeL

    set value [string range $value[set value {}] [string length $match] end]

    set state(input)   $value
    set state(buffer)  {}
    set state(lastC)   LX_END
    set state(comment) {}
    set state(tokenL)  $typetokenL
    set state(lexemeL) $typelexemeL

    set code [catch {parseparams $token} result copts]

    unset {*}{
	state(input)
	state(buffer)
	state(lastC)
	state(comment)
	state(tokenL)
	state(lexemeL)
    }

    return -options $copts [list $type $result]
}


# ::mime::header::parsetype --
#
#       Parses the string passed in and identifies the content-type and
#       params strings.
#
# Arguments:
#       token  The MIME token to parse.
#       string The content-type string that should be parsed.
#
# Results:
#       Returns the content and params for the string as a two element
#       tcl list.

proc ::mime::header::parsetype {token string} {
    # FRINK: nocheck
    upvar 0 $token state

    variable typetokenL
    variable typelexemeL

    set state(input)   $string
    set state(buffer)  {}
    set state(lastC)   LX_END
    set state(comment) {}
    set state(tokenL)  $typetokenL
    set state(lexemeL) $typelexemeL

    catch {parsetypeaux $token} result copts

    unset {*}{
	state(input)
	state(buffer)
	state(lastC)
	state(comment)
	state(tokenL)
	state(lexemeL)
    }

    return -options $copts $result
}


# ::mime::header::parsetypeaux --
#
#       A helper function for mime::parsetype.  Parses the specified
#       string looking for the content type and params.
#
# Arguments:
#       token  The MIME token to parse.
#       string The content-type string that should be parsed.
#
# Results:
#       Returns the content and params for the string as a two element
#       tcl list.

proc ::mime::header::parsetypeaux token {
    # FRINK: nocheck
    upvar 0 $token state
    set params {}

    if {[parselexeme $token] ne {LX_ATOM}} {
        error [list expecting type found $state(buffer)]
    }
    set type [string tolower $state(buffer)]

    switch [parselexeme $token] {
        LX_SOLIDUS {
        }

        LX_END {
            if {$type ne {message}} {
                error [list expecting type/subtype found $type]
            }

            return [list message/rfc822 {}]
        }

        default {
            error [list expecting / found  $state(buffer)]
        }
    }

    if {[parselexeme $token] ne {LX_ATOM}} {
        error [list expecting subtype found $state(buffer)]
    }
    append type [string tolower /$state(buffer)]

    switch [parselexeme $token] {
	LX_END {
	}

	LX_SEMICOLON {
	    set params [parseparams $token]
	}

	default {
	    error [list expecting  {;  or end} found $state(buffer)]
	}
    }

    list $type $params
}


proc ::mime::header::processparams params {
    set info {}
    foreach key [lsort -dictionary [dict keys $params]] {
	set pvalue [dict get $params $key]
	# a trailing asterisk is ignored if this is not the first field in an
	# identically-named series

	# this expression can't fail
	regexp {^([^*]+?)(?:([*])([0-9]+))?([*])?$} $key -> name star1 counter star2
	dict update info $name dict1 {
	    if {![info exists dict1]} {
		set dict1 {}
	    }
	    dict update dict1 encoding encoding value value {
		if {$star1 ne {}} {
		    if {$star2 ne {} || $counter eq {}} {
			if {![regexp {^([^']*)'([^']*)'(.*)$} $pvalue \
			    -> charset lang pvalue]} {

			    error [list [list malformed language information in \
				extended parameter name]]
			}
			if {$charset ne {}} {
			    set encoding [reversemapencoding $charset]
			}
		    }
		}
		append value $pvalue
	    }
	}
    }

    set params {}
    dict for {key pinfo} $info[set info {}] {
	dict update pinfo encoding encoding value value {}
	if {[info exists encoding]} {
	    set value [string map {% {\x}} $value[set value {}]]
	    set value [subst -novariables -nocommands $value[set value {}]]
	    set value [::encoding convertfrom $encoding $value]
	}
	dict set params $key $value
    }
    return $params
}


proc ::mime::header::serialize {name value params} {
    variable notattchar_re
    set lname [string tolower $name]

    # to do: check key for conformance
    # to do: properly quote/process $value for interpolation
    if {[regexp {[^\x21-\x39\x3b-\x7e]} $name]} {
	error [
	    list {non-printing character or colon character in header name} $name]
    }
    if {[regexp {[^\t\x20-\x7e]} $value]} {
	error [
	    list {non-printing character in header value}]
    }

    switch $lname {
	content-id - message-id {
	    set value <$value>
	}
    }

    set res "$name: $value"

    if {[llength $params] % 2} {
	set extra [lindex $params end]
	set params [lreplace $params[set params {}] end end]
    } else {
	set extra {}
    }
    foreach {key value} $params {
	if {[regexp $notattchar_re $key]} {
	    error [list {illegal character found in attribute name}]
	}
	set len [expr {[string length $key]} + 1 + [string length $value]]
	# save one byte for the folding white space continuation space
	# and two bytes for "; "
	if {$len > 73 || ![regexp {[^-!#$%&'*+,.\w`~^@{}|]+$} $value]} {
	    # save two bytes for the quotes
	    if {$len <= 71 && ![regexp {[^\x20-\x7e]} $value]} {
		set value "[string map [list \\ \\\\ \" \\\"] $value[set value {}]]"
		append res "\n\t; $key=$value"
	    } else {
		set value [::encoding convertto utf-8 $value]

		regsub -all -- $notattchar_re $value {[format %%%02X [scan "\\&" %c]]} value
		set value [subst -novariables $value]

		set partnum 0
		set start 0
		set param $key*$partnum*=utf-8''
		while {$start < [string length $value]} {
		    # subtract one from the limit to ensure that at least one byte
		    # is included in the part value
		    if {[string length $param] > 72} {
			error [list {parameter name is too long}]
		    }
		    set end [expr {$start + 72 - [string length $param]}]
		    set part [string range $value $start $end]
		    incr start [string length $part]
		    append res "\n\t; $param$part"
		    set param $key*$partnum=
		    incr partnum
		}
	    }
	} else {
	    append res "\n\t; $key=$value"
	}
    }
    foreach item $extra {
	append res "\n\t; $item"
    }
    return $res
}


# ::mime::header::set --
#
#    mime::header::set writes, appends to, or deletes the value associated
#    with a key in the header.
#
#    The value for -mode is one of:
#
#       write: the key/value is either created or overwritten (the
#       default);
#
#       append: a new value is appended for the key (creating it as
#       necessary); or,
#
#       delete: all values associated with the key are removed (the
#       "value" parameter is ignored).
#
#    Regardless, mime::setheader returns the previous value associated
#    with the key.
#
# Arguments:
#       token      The MIME token to parse.
#       key        The name of the key whose value should be set.
#       value      The value for the header key to be set to.
#       ?params?   A dictionary of parameters for the header.
#       ?args?       An optional argument of the form:
#                  ?-mode "write" | "append" | "delete"?
#
# Results:
#       Returns previous value associated with the specified key.

proc ::mime::header::set_ {token key value args} {
    variable internal
    # FRINK: nocheck
    upvar 0 $token state
    upvar 0 \
	state(contentid) contentid \
	state(contentidlower) contentidlower \
	state(header) header \
	state(headerinternal) headerinternal \
	state(headerinternallower) headerinternallower \
	state(headerlower) headerlower \
	state(messageid) messageid \
	state(messageidlower) messageidlower
    parse $token

    set params {}
    switch [llength $args] {
	1 - 3 {
	    set args [lassign $args[set args {}] params]
	}
	0 - 2 {
	    # carry on
	}
	default {
	    error [list {wrong # args}]
	}
    }
    array set options [list -mode write]
    array set options {}
    dict for {opt val} $args {
	switch $opt {
	    -mode {
		set options($opt) $val
	    }
	    default {
		error [list {unknon option} $opt]
	    }
	}
    }

    set lower [string tolower $key]
    set result {}
    switch $options(-mode) {
	append - write {
	    switch $lower {
		content-md5
		    -
		content-transfer-encoding
		    -
		mime-version
		    -
		content-type {
		    if {!$internal} {
			switch $lower {
			    default {
				if {[exists $token $lower]} {
				    lassign [get $token $lower] values params1
				    if {$value ni $values} {
					error "key $key may not be set"
				    }
				}
			    }
			}
		    }
		    switch $lower {
			content-type {
			    if {[string match multipart/* $value]
				&&
				![dict exists $params boundary]
			    } {
				dict set params boundary [boundary]
			    }
			}
			default {
			    #carry on
			}
		    }
		}
	    }
	    if {$options(-mode) eq {write}} {
		if {[dict exists $header $key]} {
		    dunset header $key
		}
		if {[dict exists $headerlower $lower]} {
		    dunset headerlower $lower
		}

		if {[dict exists headerinternal $key]} {
		    dunset headerinternal $key
		}
		if {[dict exists $headerinternallower $lower]} {
		    dunset headerinternallower $lower
		}

	    }
	    set newval [list $value $params]
	    if {$internal} {
		switch $lower {
		    content-id {
			lappend contentid $key $newval 
			lappend contentidlower $lower $newval 
		    }
		    message-id {
			lappend messageid $key $newval 
			lappend messageidlower $lower $newval 
		    }
		    default {
			lappend headerinternal $key $newval 
			lappend headerinternallower $lower $newval 
		    }
		}
	    } else {
		lappend header $key $newval 
		lappend headerlower $lower $newval 
	    }
	}
        delete {
            dunset headerlower $lower
	    dunset headerinternallower $lower
	    dunset header $key
	    dunset headerinternal $key
        }

        default {
            error "unknown value for -mode $options(-mode)"
        }
    }

    return $result
}


proc ::mime::header::setinternal args {
    variable internal 1
    try {
	set_ {*}$args
    } finally {
	set internal 0
    }
}


# ::mime::.new --
#



#    the public interface for initializeaux

proc ::mime::.new args {
    variable mime
    if {[llength $args] % 2} {
	set args [lassign $args[set args {}] name]
    } elseif {[llength $args]} {
	error [list {wrong # args}]
    } else {
	set name {}
    }
    set mimeid [incr mime(uid)]
    set token [namespace current]::$mimeid
    if {$name eq {}} {
	set name $token
    } elseif {![string match ::* $name]} {
	set name [uplevel 1 {namespace current}]::$name
    }

    set cookiecmd [namespace current]::${mimeid}_cookie
    namespace ensemble create -command $cookiecmd -map [list \
	delete [list cookie_delete $name] \
	set [list cookie_set $name]
    ]

    set headercmd [namespace current]::${mimeid}_header
    namespace ensemble create -command $headercmd -map [list \
	get [list header::get $name] \
	exists [list header::exists $token] \
	parse [list header::parse $token] \
	set [list header::set_ $token] \
	serialize header::serialize \
	setinternal [list header::setinternal $token]
    ]

    namespace ensemble create -command $name -map [list \
	.destroy [list .destroy $token] \
	body [list body $name] \
	contenttype [list contenttype $name] \
	cookie [list $cookiecmd] \
	datetime [list datetime $token] \
	field_decode [list field_decode $token] \
	header [list $headercmd] \
	mapencoding [list mapencoding $token] \
	qp [list qp $token] \
	parseaddress [list parseaddress $token] \
	parsepart [list parsepart $name] \
	property [list property $name] \
	reversemapencoding [list reversemapencoding $token] \
	serialize [list serialize $name] \
	setheader [list setheader $token] \
	token [list ::lindex $token]  \
	uniqueID [list uniqueID $token] \
	word_decode [list word_decode $token] \
	word_encode [list word_encode $token]
    ]

    trace add command $name delete [list apply [list {
	token cookiecmd headercmd old new op} {
	::mime::.destroy $token
	rename $cookiecmd {}
	rename $headercmd {}
    }] $token $cookiecmd $headercmd]

    # FRINK: nocheck
    upvar 0 $token state
    set state(ensemble) $name

    if {[catch {uplevel 1 [
	list mime::initializeaux $name {*}$args]} result eopts]} {
        catch {mime::.destroy $token -subordinates dynamic}
        return -options $eopts $result
    }
    return $name
}

# ::mime::initializeaux --
#
#    Creates a MIME part and returns the MIME token for that part.
#
# Arguments:
#    args   Args can be any one of the following:
#                  ?-canonical type/subtype
#                  ?-params    {?key value? ...}
#                  ?-encoding value?
#                  ?-headers   {?key value? ...}
#                  ?-spec   ?mime | cgi | http? 
#                  (-chan value | -parts {token1 ... tokenN})
#
#       If the -canonical option is present, then the body is in
#       canonical (raw) form and is found by consulting either the,
#       -chan, or -parts option.
#
#       -header
#           a dictionary of headers
#               with possibliy-redundant keys
#
#       -params
#           a dictionary of parameters
#           with possibly-redundant keys
#
#
#       Also, -encoding, if present, specifies the
#       "Content-Transfer-Encoding" when copying the body.
#
#       If the -canonical option is not present, then the MIME part
#       contained in -chan option is parsed,
#       dynamically generating subordinates as appropriate.
#
# Results:


#    An initialized mime token.


proc ::mime::initializeaux {_ args} {
    set token [$_ token]
    variable channels
    # FRINK: nocheck
    upvar 0 $token state
    upvar 0 state(canonicalP) canonicalP state(params) params \
	state(relax) relax

    set ipnuts 0

    set params {}

    set state(addcontentid) 1
    set state(addmessageid) 1
    set state(addmimeversion) 1

    # contains the decoded message body 
    set state(bodychan) {}
    set state(bodydecoded) 0
    set state(bodyparsed) 0
    set state(dynamic) {}
    set canonicalP 0
    set state(closechan) 1
    set state(contentid) {}
    set state(contentidlower) {}
    set state(encoding) {}
    set state(encodingdone) 0
    set state(eof) 0
    set state(header) {}
    set state(headerinternal) {}
    set state(headerinternallower) {}
    set state(headerlower) {}
    set state(headerparsed) 0
    set state(isstring) 0 
    set relax [dict create finalboundary 0]
    set state(messageid) {}
    set state(messageidlower) {}
    set state(root) $token
    set state(sawclosing) 0
    set state(spec) mime
    set state(size) 0
    set state(usemem) 0 
    set state(version) 1.0
	set state(warnings) {}

    set userparams 0

    set argc [llength $args]
    for {set argx 0} {$argx < $argc} {incr argx} {
        set option [lindex $args $argx]
        if {[incr argx] >= $argc} {
            error "missing argument to $option"
        }
        set value [lindex $args $argx]

        switch $option {
	    -addcontentid {
		set state(addcontentid) [expr {!!$value}]
	    }
	    -addmessageid {
		set state(addmessageid) [expr {!!$value}]
	    }
	    -addmimeversion {
		set state(addmimeversion) [expr {!!$value}]
	    }
	    -boundary {
		set state(boundary) $value
	    }
            -canonical {
		set canonicalP 1
		set type [string tolower $value]
            }
	    -chan {
		checkinputs
		addchan $token [uplevel 1 [list namespace which $value]]
	    }

	    -close {
		set state(closechan) [expr {!!$value}]
	    }

            -encoding {
		set value [string tolower $value[set value {}]]

                switch $value {
                    7bit - 8bit - binary - quoted-printable - base64 {
                    }

                    default {
                        error "unknown value for -encoding $state(encoding)"
                    }
                }
                set state(encoding) [string tolower $value]
            }

	    -file {
		checkinputs
		addchan $token [tcllib::chan::base .new [
		    info cmdcount]_chan [open $value]]
	    }

            -headers {
		# process headers later in order to assure that content-id and
		# content-type occur first
		if {[info exists headers]} {
		    error [list {-headers option occurred more than once}]
		}
                if {[llength $value] % 2} {
                    error [list -headers expects a dictionary]
                }
		set headers $value
            }

            -params {
		if {$userparams} {
		    error [list {-params can only be provided once}]
		}
		set userparams 1
                if {[llength $value] % 2} {
		    error [list -params expects a dictionary]
                }
		foreach {mixed pvalue} $value {
		    set lower [string tolower $mixed]
		    if {[dict exists params $lower]} {
			error "the $mixed parameter may be specified at most once"
		    }

		    dict set params $lower $pvalue
		}
            }

            -parts {
		checkinputs
		set canonicalP 1
                set state(parts) $value
            }

	    -relax {
		relax $token $value 1 
	    }

            -root {
                # the following are internal options
                set state(root) $value
            }

	    -spec {
		switch $value {
		    cgi - http {
			set state(addcontentid) 0
			set state(addmimeversion) 0
			set state(addmessageid) 0
			set state(spec) http
		    }
		    mime {
			set state(addcontentid) 1
			set state(addmimeversion) 1
			set state(spec) mime
		    }
		    default {
			error [list {unknown protocol}]
		    }
		}
	    }

	    -strict {
		relax $token $value [expr {!$value}]
	    }

	    -string {
		checkinputs
		addchan $token [tcllib::chan::base .new [
		    info cmdcount]_chan [::tcl::chan::string $value]]
	    }

	    -usemem {
		set state(usemem) [expr {!!$value}] 
	    }

            default {
                error [list {unknown option} $option]
            }
        }
    }

    if {![info exists inputs]} {
	error [list {specify exactly one of} {-chan -file -parts -string}]
    }

    if {$canonicalP} {
	if {![info exists type]} {
	    set type multipart/mixed
	}

	header::setinternal $token Content-Type $type $params

	if {[info exists headers]} {
	    foreach {name hvalue} $headers {
		set lname [string tolower $name]
		if {$lname eq {content-type}} {
		    error [list {use -canonical instead of -headers} $hkey $name]
		}
		if {$lname eq {content-transfer-encoding}} {
		    error [list {use -encoding instead of -headers} $hkey $name]
		}
		if {$lname in {content-md5 mime-version}} {
		    error [list {don't go there...}]
		}
		header::setinternal $token $name $hvalue
	    }
	}

	lassign [$_ header get content-type] content dummy

	if {[info exists state(parts)]} {
	    switch -glob $content {
		text/*
		    -
		image/*
		    -
		audio/*
		    -
		video/* {
		    error "-canonical $content and -parts do not mix"
		}

		default {
		    if {$state(encoding) ne {}} {
			error "-encoding and -parts do not mix"
		    }
		}
	    }
	}

        set state(version) 1.0
        return
    }

    if {[dict size $params]} {
        error "-param requires -canonical"
    }
    if {$state(encoding) ne {}} {
        error "-encoding requires -canonical"
    }
    if {[info exists headers]} {
        error "-header requires -canonical"
    }

}


proc mime::makeseekable token {
    upvar 0 $token state
    upvar 0 state(bodychan) bodychan state(fd) inputchan 
    set chan2 [::tcllib::chan::base [info cmdcount]_chan [file tempfile]]
    chan configure $chan2 -translation binary
    chan copy $inputchan $chan2
    incr size [tell $chan2]
    seek $chan2 0
    close $inputchan
    set inputchan [::tcllib::chan::base [info cmdcount]_chan $chan2]
    return
}


# ::mime::mapencoding --
#
#    mime::mapencodings maps tcl encodings onto the proper names for their
#    MIME charset type.  This is only done for encodings whose charset types
#    were known.  The remaining encodings return {} for now.
#
# Arguments:
#       enc      The tcl encoding to map.
#
# Results:
#    Returns the MIME charset type for the specified tcl encoding, or {}
#       if none is known.

proc ::mime::mapencoding {enc} {

    variable encodings

    if {[info exists encodings($enc)]} {
        return $encodings($enc)
    }
    return {}
}

# ::mime::parsepart --
#
#       Parses the MIME headers and attempts to break up the message
#       into its various parts, creating a MIME token for each part.
#
# Arguments:
#       token  The MIME token to parse.
#
# Results:
#       Throws an error if it has problems parsing the MIME token,
#       otherwise it just sets up the appropriate variables.

proc ::mime::parsepart _ {
    set token [$_ token]
    upvar 0 $token state
    if {$state(canonicalP) || $state(bodyparsed)} {
	return
    }
    set state(bodyparsed) 1
    parsepartaux $_
}


proc ::mime::parsepartaux _ {
    set token [$_ token]
    # FRINK: nocheck
    upvar 0 $token state
    upvar 0 state(bodychan) bodychan state(eof) eof \
	state(fd) fd state(size) size state(usemem) usemem state(relax) relax

    header::parse $token

    # although rfc 2045 5.2 defines a default treatment for content without a
    # type, don't automatically add an explicit content-type field

    #if {![header::exists $token content-type]} {
    #    # rfc 2045 5.2
    #    header::setinternal $token Content-Type text/plain [
    #        dict create charset us-ascii]
    #}

    lassign [$_ contenttype] content params

    if {$usemem} {
	set bodychan [tcllib::chan::base .new [info cmdcount]_bodychan [
	    ::tcl::chan::memchan]]
    } else {
	set bodychan [tcllib::chan::base .new [info cmdcount]_bodychan]
	tcllib::chan::getslimit $bodychan
	$bodychan .init [file tempfile]
    }
    if {[dict exists $params charset]} {
	set charset [reversemapencoding [dict get $params charset]]
	if {$charset eq {}} {
		upvar 0 state(warnings) warnings
		lappend warnings [list {unknown charset} [
		dict get $params charset] {using binary translation instead}]
	    # but still do line automatic translation
	    $fd configure -encoding binary -translation auto
	} else {
	    $fd configure -encoding [reversemapencoding [dict get $params charset]]
	}
    }
    $bodychan configure -translation binary

    if {[info exists state(boundary)]} {
	set gets [list mimegets $token line]
	set iseof {$eof}
    } else {
	set gets [list $fd gets line]
	set iseof {[$fd eof] || $eof}
    }

    if {[string match multipart/* $content]} {
	set state(parts) {}

	dict update params boundary boundary {}
	if {![info exists state(boundary)]} {
	    if {![info exists boundary]} {
		error "boundary parameter is missing in $content"
	    }

	    if {[string trim $boundary] eq {}} {
		error "boundary parameter is empty in $content"
	    }
	}

	while 1 {
	    if $iseof {
		break
	    }
	    if {![llength $state(parts)]} {
		set x [{*}$gets]
		if {$x == -1} {
		    break
		}
	    }
	    if {[string first --$boundary-- $line] >= 0} {
		    # No starting boundary was seen prior to the terminating boundary.
		    # Interpret this to mean there are no more parts, and also attempt
		    # to make a part from data already seen.

		    # Covered by by test case mime-3.7, using  "badmail1.txt".

		    set state(sawclosing) 1

		    $bodychan puts $line
		    $bodychan seek 0

		    set child [.new {} -chan $bodychan \
			-root $state(root) -boundary $boundary -usemem $usemem]
		    $child parsepart
		    
		    lappend state(parts) $child
		    lappend state(dynamic) $child
		    $child header setinternal Content-Type application/octet-stream
		    break
	    } elseif {[llength $state(parts)] || [string first --$boundary $line] == 0} {
		    # either just saw the first boundary or saw a boundary between parts

		    # do not brace this expression 
		    if $iseof {
			# either saw the closing boundary or reached the end of the file
			break
		    } elseif {[string first --$boundary-- $line] >= 0} {
			set state(sawclosing) 1
			break
		    } else {
			#mimegets returned 0 because it found a border

			set child [.new {} -chan $fd \
			    -root $state(root) -boundary $boundary -usemem $usemem]
			$child parsepart
			lappend state(parts) $child
			lappend state(dynamic) $child
			upvar 0 $child childstate
			set state(sawclosing) $childstate(sawclosing)
			if {$childstate(eof)} break
		    }
	    } else {
		# Accumulate data in case the terminating boundary occurs starting
		# boundary was found, so that a part can be generated from data
		# seen so far.
		if $iseof {
		    $bodychan puts -nonewline $line
		} else {
		    $bodychan puts $line
		}
		set size [expr {$size + [
		    string length $line] + 1}]
	    }
	}
	if {!$state(sawclosing) && ![dict get $relax finalboundary]} {
	    error {end-of-string encountered while parsing multipart/form-data}
	}
    } else {
	if {[info exists state(boundary)]} {
	    while 1 {
		set x [{*}$gets]
		if {$x == -1} {
		    break
		} else {
		    if {[incr linesout] > 1} {
			$bodychan puts -nonewline \n$line
		    } else {
			$bodychan puts -nonewline $line
		    }
		    set size [expr {$size + [
			string length $line] + 1}]
		}
	    }
	} else {
	    $fd copy [$bodychan configure -chan]
	    set size [$bodychan tell]
	}
	$bodychan seek 0

        if {[string match message/* $content]} {
            # FRINK: nocheck
	    setencoding $token $bodychan
	    setcharset $_ $bodychan

	    set child [.new {} -chan $bodychan -usemem $usemem]

            lappend state(parts) $child
	    lappend state(dynamic) $child
	    $child parsepart
        } else {
	    # this is undtrusted data, so keep the getslimit enabled on the
	    # assumption that no one else wants to get hit by a long-line
	    # attack either.
	    #$bodychan configure -getslimit -1
	}
    }
    return
}


# ::mime::property --
#
#   mime::property returns the properties of a MIME part.
#
#   The properties are:
#
#       property    value
#       ========    =====
#       content     the type/subtype describing the content
#       encoding    the "Content-Transfer-Encoding"
#       params      a list of "Content-Type" parameters
#       parts       a list of tokens for the part's subordinates
#       size        the approximate size of the content {before decoding} 
#
#   The "parts" property is present only if the MIME part has
#   subordinates.
#
#   If mime::property is invoked with the name of a specific
#   property, then the corresponding value is returned; instead, if
#   -names is specified, a list of all properties is returned;
#   otherwise, a dictionary of properties is returned.
#
# Arguments:
#       token      The MIME token to parse.
#       property   One of 'content', 'encoding', 'params', 'parts', and
#                  'size'. Defaults to returning a dictionary of
#                  properties.
#
# Results:
#       Returns the properties of a MIME part

proc ::mime::property {_ {property {}}} {
    set token [$_ token]
    # FRINK: nocheck
    upvar 0 $token state
    $_ parsepart

    lassign [$_ contenttype] content params

    switch $property {
        {} {
            array set properties [list content  $content \
                                       encoding $state(encoding) \
                                       params   $params \
                                       size     [getsize $_]]
            if {[info exists state(parts)]} {
                set properties(parts) $state(parts)
            }

            return [array get properties]
        }

        -names {
            set names [list content encoding params]
            if {[info exists state(parts)]} {
                lappend names parts
            }
	    lappend nams size

            return $names
        }

        content
            -
        params {
	    return [set $property]
        }

        encoding {
            return $state($property)
	}
        parts {
            if {![info exists state(parts)]} {
                error [list not a multipart message]
            }

            return $state(parts)
        }

        size {
            return [getsize $_]
        }

        default {
            error [list {unknown property} $property]
        }
    }
}


# ::mime::parseaddress --
#
#       This was originally written circa 1982 in C. we're still using it
#       because it recognizes virtually every buggy address syntax ever
#       generated!
#
#       mime::parseaddress takes a string containing one or more 822-style
#       address specifications and returns a list of dictionaries, for each
#       address specified in the argument.
#
#    Each dictionary contains these properties:
#
#       property    value
#       ========    =====
#       address     [email protected]
#       comment     822-style comment
#       domain      the domain part (rhs)
#       error       non-empty on a parse error
#       group       this address begins a group
#       friendly    user-friendly rendering
#       local       the local part (lhs)
#       memberP     this address belongs to a group
#       phrase      the phrase part
#       proper      822-style address specification
#       route       822-style route specification (obsolete)
#
#    Note that one or more of these properties may be empty.
#
# Arguments:
#    string        The address string to parse
#
# Results:
#    Returns a list of dictionaries, one element for each address
#       specified in the argument.

proc ::mime::parseaddress {string args} {
    variable mime
    set token [namespace current]::[incr mime(uid)]
    # FRINK: nocheck
    upvar 0 $token state


    if {[llength $args]} {
	set string2 [lindex $args end]
	set args [list $string {*}[lrange $args 0 end-1]]
	set string $string2
    }
    dict for {opt val} $args {
	switch $opt {
	    hostname {
		set state(default_host) $val
	    }
	}
    }

    catch {mime::parseaddressaux $token $string} result copts

    foreach name [array names state] {
        unset state($name)
    }
    # FRINK: nocheck
    catch {unset $token}

    return -options $copts $result
}


# ::mime::parseaddressaux --
#
#       This was originally written circa 1982 in C. we're still using it
#       because it recognizes virtually every buggy address syntax ever
#       generated!
#
#       mime::parseaddressaux does the actually parsing for mime::parseaddress
#
#    Each dictionary contains these properties:
#
#       property    value
#       ========    =====
#       address     [email protected]
#       comment     822-style comment
#       domain      the domain part (rhs)
#       error       non-empty on a parse error
#       group       this address begins a group
#       friendly    user-friendly rendering
#       local       the local part (lhs)
#       memberP     this address belongs to a group
#       phrase      the phrase part
#       proper      822-style address specification
#       route       822-style route specification (obsolete)
#
#    Note that one or more of these properties may be empty.
#
# Arguments:
#    token         The MIME token to work from.
#    string        The address string to parse
#
# Results:
#    Returns a list of dictionaries, one for each address specified in the
#    argument.

proc ::mime::parseaddressaux {token string} {
    # FRINK: nocheck
    upvar 0 $token state

    variable addrtokenL
    variable addrlexemeL

    set state(input)   $string
    set state(glevel)  0
    set state(buffer)  {}
    set state(lastC)   LX_END
    set state(tokenL)  $addrtokenL
    set state(lexemeL) $addrlexemeL

    set result {}
    while {[addr_next $token]} {
        if {[set tail $state(domain)] ne {}} {
            set tail @$state(domain)
        } else {
			if {![info exists state(default_host)]} {
				set state(default_host) [info hostname]
			}
            set tail @$state(default_host)
        }
        if {[set address $state(local)] ne {}} {
            #TODO: this path is not covered by tests
            append address $tail
        }

        if {$state(phrase) ne {}} {
            #TODO: this path is not covered by tests
            set state(phrase) [string trim $state(phrase) \"]
            foreach t $state(tokenL) {
                if {[string first $t $state(phrase)] >= 0} {
                    #TODO:  is this quoting robust enough?
                    set state(phrase) \"$state(phrase)\"
                    break
                }
            }

            set proper "$state(phrase) <$address>"
        } else {
            set proper $address
        }

        if {[set friendly $state(phrase)] eq {}} {
            #TODO: this path is not covered by tests
            if {[set note $state(comment)] ne {}} {
                if {[string first ( $note] == 0} {
                    set note [string trimleft [string range $note 1 end]]
                }
                if {
		    [string last ) $note]
                        == [set len [expr {[string length $note] - 1}]]
		} {
                    set note [string range $note 0 [expr {$len - 1}]]
                }
                set friendly $note
            }

            if {
		$friendly eq {}
		&&
		[set mbox $state(local)] ne {}
	    } {
                #TODO: this path is not covered by tests
                set mbox [string trim $mbox \"]

                if {[string first / $mbox] != 0} {
                    set friendly $mbox
                } elseif {[set friendly [addr_x400 $mbox PN]] ne {}} {
                } elseif {
		    [set friendly [addr_x400 $mbox S]] ne {}
                    &&
		    [set g [addr_x400 $mbox G]] ne {}
		} {
                    set friendly "$g $friendly"
                }

                if {$friendly eq {}} {
                    set friendly $mbox
                }
            }
        }
        set friendly [string trim $friendly \"]

        lappend result [list address  $address        \
                             comment  $state(comment) \
                             domain   $state(domain)  \
                             error    $state(error)   \
                             friendly $friendly       \
                             group    $state(group)   \
                             local    $state(local)   \
                             memberP  $state(memberP) \
                             phrase   $state(phrase)  \
                             proper   $proper         \
                             route    $state(route)]

    }

    unset {*}{
	state(input)
	state(glevel)
	state(buffer)
	state(lastC)
	state(tokenL)
	state(lexemeL)
    }

    return $result
}


# ::mime::parselexeme --
#
#    Used to implement a lookahead parser.
#
# Arguments:
#       token    The MIME token to operate on.
#
# Results:
#    Returns the next token found by the parser.

proc ::mime::parselexeme token {
    # FRINK: nocheck

    upvar 0 $token state

    set state(input) [string trimleft $state(input)]

    set state(buffer) {}
    if {$state(input) eq {}} {
        set state(buffer) end-of-input
        return [set state(lastC) LX_END]
    }

    set c [string index $state(input) 0]
    set state(input) [string range $state(input) 1 end]

    if {$c eq {(}} {
        set noteP 0
        set quoteP 0

        while 1 {
            append state(buffer) $c

            #TODO: some of these paths are not covered by tests
            switch $c/$quoteP {
                (/0 {
                    incr noteP
                }

                \\/0 {
                    set quoteP 1
                }
................................................................................
    if {$c eq "\""} {
        set firstP 1
        set quoteP 0

        while 1 {
            append state(buffer) $c

            switch $c/$quoteP {
                "\\/0" {
                    set quoteP 1
                }

                "\"/0" {
                    if {!$firstP} {
                        return [set state(lastC) LX_QSTRING]
................................................................................

    if {$c eq {[}} {
        set quoteP 0

        while 1 {
            append state(buffer) $c

            switch $c/$quoteP {
                \\/0 {
                    set quoteP 1
                }

                ]/0 {
                    return [set state(lastC) LX_DLITERAL]
                }
................................................................................
            }
            set state(input) [string range $state(input) 1 end]
        }
    }

    if {[set x [lsearch -exact $state(tokenL) $c]] >= 0} {
        append state(buffer) $c

        return [set state(lastC) [lindex $state(lexemeL) $x]]
    }

    while 1 {
        append state(buffer) $c

        switch [set c [string index $state(input) 0]] {
            {} - " " - "\t" - "\n" {
                break
            }

            default {
                if {[lsearch -exact $state(tokenL) $c] >= 0} {
                    break
................................................................................

        set state(input) [string range $state(input) 1 end]
    }

    return [set state(lastC) LX_ATOM]
}
























# ::mime::reversemapencoding --
#
#    mime::reversemapencodings maps MIME charset types onto tcl encoding names.
#    Those that are unknown return {}.
#
# Arguments:
#       mimeType  The MIME charset to convert into a tcl encoding type.
#
# Results:
#    Returns the tcl encoding name for the specified mime charset, or {}
#       if none is known.

proc ::mime::reversemapencoding mimeType {

    variable reversemap

    set lmimeType [string tolower $mimeType]
    if {[info exists reversemap($lmimeType)]} {
        return $reversemap($lmimeType)
    }
    return {}
}


proc ::mime::relax {token args} {
    upvar 0 $token state
    upvar 0 state(relax) relax
    foreach {key val} $args {
	switch $key {
	    all {
		dict set relax finalboundary 1
	    }
	    finalboundary {
		dict set relax $key [expr {!!$val}]
	    }
	    default {
		error [list {unknown value for -relax} $key {should be one of} {
		    all finalboundary
		}]
	    }
	}
    }
}


# ::mime::serialize --
#
#    Serializes a message to a value or a channel.
#
# Arguments:
#       token      The MIME token to parse.
#       channel    The channel to copy the message to.
#
# Results:
#       Returns nothing unless an error is thrown while the message
#       is being written to the channel.


proc ::mime::serialize {_ args} {
    set level 0
    set chan {} 
    dict for {arg val} $args {
	switch $arg {
	    -chan {
		if {$val eq {}} {
		    error [list {chan must not be the empty string}]
		}
		set chan [uplevel 1 [list ::namespace which $val]]
	    }
	    -level {
		set level [expr {$val + 0}]
	    }
	    default {
		error [list {unknown option} $arg]
	    }
	}
    }

    if {$chan eq {}} {
	set token [$_ token]
	upvar 0 $token state
	set code [catch {serialize_value $_ $level} result copts]
	return -options $copts $result
    } else {
	return [serialize_chan $_ $chan $level]
    }
}


proc ::mime::serialize_chan {_ channel level} {
    set token [$_ token]
    # FRINK: nocheck
    upvar 0 $token state
    upvar 0 state(bodychan) bodychan
    $_ parsepart

    set result {}
    if {!$level && $state(addmimeversion)} {
	$channel puts [header::serialize MIME-Version $state(version) {}]
    }
    contentid $_
    if {![header::exists $token content-id] && $state(addcontentid)} {
	header::setinternal $token Content-ID [contentid $_]
    }
    if {![header::exists $token message-id] && $state(addmessageid)} {
	header::setinternal $token Message-ID [messageid $_]
    }

    foreach {name value} [$_ header get] {
	$channel puts [header::serialize $name {*}$value]
    }

    set converter {}
    set encoding {}
    if {![info exists state(parts)]} {
        if {$state(canonicalP)} {
	    set encoding [getTransferEncoding $_]
            if {$encoding ne {}} {
                $channel puts "Content-Transfer-Encoding: $encoding"
            }
        }
    }

    if {[info exists state(error)]} {
        unset state(error)
    }

    if {[info exists state(parts)]} {
	lassign [$_ contenttype] content params
	set boundary [dict get $params boundary]

	switch -glob $content {
	    message/* {
		$channel puts {}
		foreach part $state(parts) {
		    serialize_chan $part $channel 1
		    break
		}
	    }

	    default {
		# Note RFC 2046: See serialize_value for details.
		#
		# The boundary delimiter MUST occur at the
		# beginning of a line, i.e., following a CRLF, and
		# the initial CRLF is considered to be attached to
		# the boundary delimiter line rather than part of
		# the preceding part.
		#
		# - The above means that the CRLF before $boundary
		#   is needed per the RFC, and the parts must not
		#   have a closing CRLF of their own. See Tcllib bug
		#   1213527, and patch 1254934 for the problems when
		#   both file/string branches added CRLF after the
		#   body parts.


		foreach part $state(parts) {
		    $channel puts \n--$boundary
		    serialize_chan $part $channel 1
		}
		$channel puts \n--$boundary--
	    }
	}
    } else {
	$channel puts {}
	if {$state(canonicalP)} {
	    set transforms [setencoding $token $channel]
	    $state(fd) seek 0
	    $state(fd) copy [$channel $ chan]
	    while {[incr transforms -1] >= 0} {
		$channel $channel
	    }
	} else {
	    $state(bodychan) seek 0
	    $state(bodychan) copy [$channel $ chan]
	}
    }

    $channel flush

    if {[info exists state(error)]} {
        error $state(error)
    }
}


proc ::mime::serialize_value {_ level} {
    set chan [::tcllib::chan::base .new [info cmdcount]_serialize_value [
	tcl::chan::memchan]]
    $chan configure -translation crlf
    serialize_chan $_ $chan $level
    $chan seek 0
    $chan configure -translation binary
    set res [$chan read]
    $chan close
    return $res
}


proc ::mime::setencoding {token chan} {
    upvar 0 $token state

    set transforms 0

    if {[info exists state(encoding)]} {
	switch $state(encoding) {
	    base64 {
		package require tcl::transform::base64
		::tcl::transform::base64 [$chan configure -chan]
		incr transforms
	    }
	    quoted-printable {
		package require {tcl transform qp}
		::tcl::transform::qp [$chan configure -chan]
		incr transforms
	    }
	    7bit - 8bit - binary - {} {
		# Bugfix for [#477088]
		# Go ahead, leave chunk alone
	    }
	    default {
		error [list {Can't handle content encoding} $state(encoding)]
	    }
	}
    }
    return $transforms
}

proc ::mime::setcharset {_ chan} {
    set token [$_ token]
    upvar 0 $token state
    lassign [$_ contenttype] content params
    if {[dict exists $params charset]} {
	set mcharset [dict get $params charset]
    } else {
	switch $state(spec) {
	    cgi - http {
		set mcharset UTF-8
	    }
	    mime - default {
		# mime
		set mcharset US-ASCII
	    }
	}
    }
    set encoding [reversemapencoding $mcharset]
    if {$encoding eq {}} {
	$chan configure -translation binary
    } else {
	$chan configure -encoding $encoding 
    }
    return
}


# ::mime::uniqueID --
#
#    Used to generate a 'globally unique identifier' for the content-id.
#    The id is built from the pid, the current time, the hostname, and
#    a counter that is incremented each time a message is sent.
#
# Arguments:
#
# Results:
#    Returns the a string that contains the globally unique identifier
#       that should be used for the Content-ID of an e-mail message.

proc ::mime::uniqueID {} {
    set id [base64 -mode encode -- [
	sha2::sha256 -bin [expr {rand()}][pid][clock clicks][array get state]]]
    return $id
}


# ::mime::unquote
#
#    Removes any enclosing quotes and unquotes quoted pairs in a string.
proc ::mime::unquote string {
    set qstring [string match "\"*" $string]
    regsub -all {\\(.)} $string[set string {}] {\1} string 

    # this isn't exactly right because it doesn't validate that a quote at the
    # end of the string wsan't just replaced as part of a quoted pair.
    if {$qstring} {
	regexp {^["]?(.*?)["]?$} $string[set string {}] -> string
	# a quote for vim syntax coloring: "
    }
    return $string
}


# ::mime::word_encode --
#
#    Word encodes strings as per RFC 2047.
#
# Arguments:
#       charset   The character set to encode the message to.
................................................................................
#    Returns a word encoded string.

proc ::mime::word_encode {charset method string {args}} {

    variable encodings

    if {![info exists encodings($charset)]} {
        error [list {unknown charset} $charset]
    }

    if {$encodings($charset) eq {}} {
        error [list {invalid charset} $charset]
    }

    if {$method ne {base64} && $method ne {quoted-printable}} {
        error [list {unknown method} $method {must be one of} \
	    {base64 quoted-printable}]
    }

    # default to encoded and a length that won't make the Subject header to long
    array set options [list -charset_encoded 1 -maxlength 66]
    array set options $args

    if {$options(-charset_encoded)} {
................................................................................
        return {}
    }

    set string_bytelength [string bytelength $unencoded_string]

    # the 7 is for =?, ?Q?, ?= delimiters of the encoded word
    set maxlength [expr {$options(-maxlength) - [string length $encodings($charset)] - 7}]
    switch -exact $method {
        base64 {
            if {$maxlength < 4} {
                error [list maxlength $options(-maxlength) \
		    {too short for chosen charset and encoding}]
            }
            set count 0
            set maxlength [expr {($maxlength / 4) * 3}]
            while {$count < $string_length} {
                set length 0
                set enc_string {}
                while {$length < $maxlength && $count < $string_length} {
                    set char [string range $unencoded_string $count $count]
                    set enc_char [::encoding convertto $charset $char]
                    if {$length + [string length $enc_char] > $maxlength} {
                        set length $maxlength
                    } else {
                        append enc_string $enc_char
                        incr count
                        incr length [string length $enc_char]
                    }
                }
................................................................................
            # Trim off last "\n ", since the above code has the side-effect
            # of adding an extra "\n " to the encoded string.

            set result [string range $result 0 end-2]
        }
        quoted-printable {
            if {$maxlength < 1} {
                error [list maxlength $options(-maxlength) \
		    {too short for chosen charset and encoding}]
            }
            set count 0
            while {$count < $string_length} {
                set length 0
                set encoded_word {}
                while {$length < $maxlength && $count < $string_length} {
                    set char [string range $unencoded_string $count $count]
                    set enc_char [::encoding convertto $charset $char]
                    set qp_enc_char [qp::encode $enc_char 1]
                    set qp_enc_char_length [string length $qp_enc_char]
                    if {$qp_enc_char_length > $maxlength} {
                        error [list maxlength $options(-maxlength) \
			    {too short for chosen charset and encoding}]
                    }
                    if {
			$length + [string length $qp_enc_char] > $maxlength

		    } {
                        set length $maxlength
                    } else {
                        append encoded_word $qp_enc_char
                        incr count
                        incr length [string length $qp_enc_char]
                    }
                }
................................................................................
        }
        default {
            error "Can't handle content encoding \"$method\""
        }
    }
    return $result
}


# ::mime::word_decode --
#
#    Word decodes strings that have been word encoded as per RFC 2047.
#
# Arguments:
#       encoded   The word encoded string to decode.
................................................................................
#    Returns the string that has been decoded from the encoded message.

proc ::mime::word_decode {encoded} {

    variable reversemap

    if {[regexp -- {=\?([^?]+)\?(.)\?([^?]*)\?=} $encoded \
	- charset method string] != 1
    } {
        error "malformed word-encoded expression '$encoded'"
    }

    set enc [reversemapencoding $charset]
    if {$enc eq {}} {
        error "unknown charset '$charset'"
    }

    switch -exact $method {
        b -
        B {
            set method base64
        }
        q -
        Q {
            set method quoted-printable
        }
        default {
            error "unknown method '$method', must be B or Q"
        }
    }

    switch -exact $method {
        base64 {
            set result [base64 -mode decode -- $string]
        }
        quoted-printable {
            set result [qp::decode $string 1]
        }
        {} {
            # Go ahead
        }
        default {
            error "Can't handle content encoding \"$method\""
        }
    }

    return [list $enc $method $result]
}


# ::mime::field_decode --
#
#    Word decodes strings that have been word encoded as per RFC 2047
#    and converts the string from the original encoding/charset to UTF.
#
# Arguments:
................................................................................
    # version with unencoded equivalents.

    # Sorry about the grotesque regexp.  Most of it is sensible.  One
    # notable fudge: the final $ is needed because of an apparent bug
    # in the regexp engine where the preceding .* otherwise becomes
    # non-greedy - perhaps because of the earlier ".*?", sigh.

    while {[regexp {(.*?)(=\?(?:[^?]+)\?(?:.)\?(?:[^?]*)\?=)(.*)$} $field \
	ignore prefix encoded field]
    } {
        # don't allow whitespace between encoded words per RFC 2047
        if {{} ne $prefix} {
            if {![string is space $prefix]} {
                append result $prefix
            }
        }

        set decoded [word_decode $encoded]
        foreach {charset - string} $decoded break

        append result [::encoding convertfrom $charset $string]
    }

    append result $field
    return $result
}

namespace eval ::mime::header {
    ::apply [list {} {
	set saved [namespace eval [namespace parent] {
	    namespace export
	}]
	namespace eval [namespace parent] {
	    namespace export *
	}
	namespace import [namespace parent]::getTransferEncoding
	namespace import [namespace parent]::parselexeme
	namespace import [namespace parent]::reversemapencoding
	namespace import [namespace parent]::uniqueID
	namespace import [namespace parent]::unquote
	namespace eval [namespace parent] [
	    list namespace export -clear {*}$saved
	]
    } [namespace current]]
}


## One-Shot Initialization

::apply {{} {
    variable encList
    variable encAliasList
    variable reversemap
    variable timeformats

    foreach {enc mimeType} $encList {
        if {$mimeType eq {}} continue
	set reversemap([string tolower $mimeType]) $enc
    }

    foreach {enc mimeType} $encAliasList {
        set reversemap([string tolower $mimeType]) $enc
    }

    set formats1 {
	{%a, %d %b %Y %H:%M:%S %z}
	{%a, %d %b %Y %H:%M %z}
	{%a , %d %b %Y %H:%M:%S %z}
	{%a , %d %b %Y %H:%M %z}
	{%d %b %Y %H:%M:%S %z}
	{%d %b %Y %H:%M %z}
    }

    set timeformats [list {*}$formats1 {*}[string map {%Y %y} $formats1]]

    # Drop the helper variables
    unset encList encAliasList

} ::mime}