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Changes In Branch tip-400-impl Excluding Merge-Ins

This is equivalent to a diff from 6d7a7b3eb9 to 006482c0ff

2012-10-16
13:04
Implementation of TIP #400. check-in: b6e98440db user: dkf tags: trunk
12:50
merge trunk Closed-Leaf check-in: 006482c0ff user: dkf tags: tip-400-impl
2012-10-14
19:02
Bug 3576509: Better fix, which helps for all Tcl_DictObjGet() calls in Tcl's source code. check-in: 6d7a7b3eb9 user: jan.nijtmans tags: trunk
19:00
Bug 357650: Better fix, which helps for all Tcl_DictObjGet() calls in Tcl's source code. check-in: 4f28137715 user: jan.nijtmans tags: core-8-5-branch
2012-10-13
20:29
Bug 3576509: tcl::Bgerror crashes with invalid arguments check-in: 70a5908228 user: jan.nijtmans tags: trunk
2012-10-04
08:25
merge trunk check-in: 81346a2dc2 user: dkf tags: tip-400-impl, tip-vote

Changes to doc/TclZlib.3.

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\fBTcl_ZlibStreamChecksum\fR(\fIzshandle\fR)
.sp
int
\fBTcl_ZlibStreamPut\fR(\fIzshandle, dataObj, flush\fR)
.sp
int
\fBTcl_ZlibStreamGet\fR(\fIzshandle, dataObj, count\fR)


.fi
.SH ARGUMENTS
.AS Tcl_ZlibStream *zshandlePtr out
.AP Tcl_Interp *interp in
The interpreter to store resulting compressed or uncompressed data in. Also
where any error messages are written. For \fBTcl_ZlibStreamInit\fR, this can
be NULL to create a stream that is not bound to a command.
.AP int format in
What format of compressed data to work with. Must be one of
\fBTCL_ZLIB_FORMAT_ZLIB\fR for zlib-format data, \fBTCL_ZLIB_FORMAT_GZIP\fR
................................................................................
\fBTcl_ZlibStreamGet\fR, \fBTCL_ZLIB_FULLFLUSH\fR if the stream must be put
into a state where the decompressor can recover from on corruption, or
\fBTCL_ZLIB_FINALIZE\fR to ensure that the stream is finished and that any
trailer demanded by the format is written.
.AP int count in
The maximum number of bytes to get from the stream, or -1 to get all remaining
bytes from the stream's buffers.







.BE
.SH DESCRIPTION
These functions form the interface from the Tcl library to the Zlib
library by Jean-loup Gailly and Mark Adler.
.PP
\fBTcl_ZlibDeflate\fR and \fBTcl_ZlibInflate\fR respectively compress and
decompress the data contained in the \fIdataObj\fR argument, according to the
................................................................................
passed to it will have the data bytes appended to it. Internally to the
stream, data is kept compressed so as to minimize the cost of buffer space.
.PP
\fBTcl_ZlibStreamChecksum\fR returns the checksum computed over the
uncompressed data according to the format, and \fBTcl_ZlibStreamEof\fR returns
a boolean value indicating whether the end of the uncompressed data has been
reached.



















.PP
If you wish to clear a stream and reuse it for a new compression or
decompression action, \fBTcl_ZlibStreamReset\fR will do this and return a
normal Tcl result code to indicate whether it was successful; if the stream is
registered with an interpreter, an error message will be left in the
interpreter result when this function returns TCL_ERROR.
Finally, \fBTcl_ZlibStreamClose\fR will clean up the stream and delete the






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\fBTcl_ZlibStreamChecksum\fR(\fIzshandle\fR)
.sp
int
\fBTcl_ZlibStreamPut\fR(\fIzshandle, dataObj, flush\fR)
.sp
int
\fBTcl_ZlibStreamGet\fR(\fIzshandle, dataObj, count\fR)
.sp
\fBTcl_ZlibStreamSetCompressionDictionary\fR(\fIzshandle, compDict\fR)
.fi
.SH ARGUMENTS
.AS Tcl_ZlibStream zshandle in
.AP Tcl_Interp *interp in
The interpreter to store resulting compressed or uncompressed data in. Also
where any error messages are written. For \fBTcl_ZlibStreamInit\fR, this can
be NULL to create a stream that is not bound to a command.
.AP int format in
What format of compressed data to work with. Must be one of
\fBTCL_ZLIB_FORMAT_ZLIB\fR for zlib-format data, \fBTCL_ZLIB_FORMAT_GZIP\fR
................................................................................
\fBTcl_ZlibStreamGet\fR, \fBTCL_ZLIB_FULLFLUSH\fR if the stream must be put
into a state where the decompressor can recover from on corruption, or
\fBTCL_ZLIB_FINALIZE\fR to ensure that the stream is finished and that any
trailer demanded by the format is written.
.AP int count in
The maximum number of bytes to get from the stream, or -1 to get all remaining
bytes from the stream's buffers.
.AP Tcl_Obj *compDict in
A byte array object that is the compression dictionary to use with the stream.
Note that this is \fInot a Tcl dictionary\fR, and it is recommended that this
only ever be used with streams that were created with their \fIformat\fR set
to \fBTCL_ZLIB_FORMAT_ZLIB\fR because the other formats have no mechanism to
indicate whether a compression dictionary was present other than to fail on
decompression.
.BE
.SH DESCRIPTION
These functions form the interface from the Tcl library to the Zlib
library by Jean-loup Gailly and Mark Adler.
.PP
\fBTcl_ZlibDeflate\fR and \fBTcl_ZlibInflate\fR respectively compress and
decompress the data contained in the \fIdataObj\fR argument, according to the
................................................................................
passed to it will have the data bytes appended to it. Internally to the
stream, data is kept compressed so as to minimize the cost of buffer space.
.PP
\fBTcl_ZlibStreamChecksum\fR returns the checksum computed over the
uncompressed data according to the format, and \fBTcl_ZlibStreamEof\fR returns
a boolean value indicating whether the end of the uncompressed data has been
reached.
.PP
\fBTcl_ZlibStreamSetCompressionDictionary\fR is used to control the
compression dictionary used with the stream, a compression dictionary being an
array of bytes (such as might be created with \fBTcl_NewByteArrayObj\fR) that
is used to initialize the compression engine rather than leaving it to create
it on the fly from the data being compressed. Setting a compression dictionary
allows for more efficient compression in the case where the start of the data
is highly regular, but it does require both the compressor and the
decompressor to agreee on the value to use. Compression dictionaries are only
fully supported for zlib-format data; on compression, they must be set before
any data is sent in with \fBTcl_ZlibStreamPut\fR, and on decompression they
should be set when \fBTcl_ZlibStreamGet\fR produces an \fBerror\fR with its
\fB\-errorcode\fR set to
.QW "\fBZLIB NEED_DICT\fI code\fR" ;
the \fIcode\fR will be the Adler-32 checksum (see \fBTcl_ZlibAdler32\fR) of
the compression dictionary sought. (Note that this is only true for
zlib-format streams; gzip streams ignore compression dictionaries as the
format specification doesn't permit them, and raw streams just produce a data
error if the compression dictionary is missing or incorrect.)
.PP
If you wish to clear a stream and reuse it for a new compression or
decompression action, \fBTcl_ZlibStreamReset\fR will do this and return a
normal Tcl result code to indicate whether it was successful; if the stream is
registered with an interpreter, an error message will be left in the
interpreter result when this function returns TCL_ERROR.
Finally, \fBTcl_ZlibStreamClose\fR will clean up the stream and delete the

Changes to doc/zlib.n.

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'\"
'\" Copyright (c) 2008 Donal K. Fellows
'\"
'\" See the file "license.terms" for information on usage and redistribution
'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
'\" 
.so man.macros
.TH zlib n 8.6 Tcl "Tcl Built-In Commands"
.BS
................................................................................
The transformation will be a decompressing transformation that reads raw
compressed data from \fIchannel\fR, which must be readable.
.PP
The following options may be set when creating a transformation via
the
.QW "\fIoptions ...\fR"
to the \fBzlib push\fR command:







.TP
\fB\-header\fI dictionary\fR
.
Passes a description of the gzip header to create, in the same format that
\fBzlib gzip\fR understands.
.TP
\fB\-level\fI compressionLevel\fR
.
How hard to compress the data. Must be an integer from 0 (uncompressed) to 9
(maximally compressed).
'\".TP
'\"\fB\-limit\fI readaheadLimit\fR
'\".

'\"The maximum number of bytes ahead to read.
'\"\fITODO: not yet implemented!\fR


.PP
Both compressing and decompressing channel transformations add extra
configuration options that may be accessed through \fBchan configure\fR. Each
option is either a read-only or a write-only option. The options are:

















.TP
\fB\-flush\fI type\fR
.
This write-only operation flushes the current state of the compressor to the
underlying channel. It is only valid for compressing transformations. The
\fItype\fR must be either \fBsync\fR or \fBfull\fR for a normal flush or an
expensive flush respectively. Flushing degrades the compression ratio, but
makes it easier for a decompressor to recover more of the file in the case of
data corruption.
.TP
\fB\-checksum\fR
.
This read-only option gets the current checksum for the uncompressed data
that the compression engine has seen so far. It is valid for both
compressing and decompressing transforms, but not for the raw inflate
and deflate formats. The compression algorithm depends on what
format is being produced or consumed.
.TP
\fB\-header\fR
.
This read-only option, only valid for decompressing transforms that are
processing gzip-format data, returns the dictionary describing the header read
off the data stream.








.RE
.SS "STREAMING SUBCOMMAND"
.TP
\fBzlib stream\fI mode\fR ?\fIlevel\fR?
.
Creates a streaming compression or decompression command based on the
\fImode\fR, and return the name of the command. For a description of how that
command works, see \fBSTREAMING INSTANCE COMMAND\fR below. The following modes
are supported:
.RS
.TP
\fBzlib stream compress\fR ?\fIlevel\fR?
.
The stream will be a compressing stream that produces zlib-format output,
using compression level \fIlevel\fR (if specified) which will be an integer
from 0 to 9.



.TP
\fBzlib stream decompress\fR
.
The stream will be a decompressing stream that takes zlib-format input and
produces uncompressed output.




.TP
\fBzlib stream deflate\fR ?\fIlevel\fR?
.
The stream will be a compressing stream that produces raw output, using
compression level \fIlevel\fR (if specified) which will be an integer from 0
to 9.





.TP
\fBzlib stream gunzip\fR
.
The stream will be a decompressing stream that takes gzip-format input and
produces uncompressed output.
.TP
\fBzlib stream gzip\fR ?\fIlevel\fR?
.
The stream will be a compressing stream that produces gzip-format output,
using compression level \fIlevel\fR (if specified) which will be an integer
from 0 to 9.
'\" TODO: Header dictionary!
.TP
\fBzlib stream inflate\fR
.
The stream will be a decompressing stream that takes raw compressed input and
produces uncompressed output.





.RE
.SS "CHECKSUMMING SUBCOMMANDS"
.TP
\fBzlib adler32\fI string\fR ?\fIinitValue\fR?
.
Compute a checksum of binary string \fIstring\fR using the Adler-32 algorithm.
If given, \fIinitValue\fR is used to initialize the checksum engine.
................................................................................
command. They are used by calling their \fBput\fR subcommand one or more times
to load data in, and their \fBget\fR subcommand one or more times to extract
the transformed data.
.PP
The full set of subcommands supported by a streaming instance command,
\fIstream\fR, is as follows:
.TP
\fIstream \fBadd\fR ?\fIoption\fR? \fIdata\fR
.
A short-cut for
.QW "\fIstream \fBput \fIoption data\fR"
followed by
.QW "\fIstream \fBget\fR" .
.TP
\fIstream \fBchecksum\fR
.
Returns the checksum of the uncompressed data seen so far by this stream.
.TP
................................................................................
.QW "\fIstream \fBput \-fullflush {}\fR" .
.TP
\fIstream \fBget \fR?\fIcount\fR?
.
Return up to \fIcount\fR bytes from \fIstream\fR's internal buffers with the
transformation applied. If \fIcount\fR is omitted, the entire contents of the
buffers are returned.






.TP
\fIstream \fBput\fR ?\fIoption\fR? \fIdata\fR
.
Append the contents of the binary string \fIdata\fR to \fIstream\fR's internal
buffers while applying the transformation. If present, \fIoption\fR must be
one of the following (or an unambiguous prefix) which are used to modify the
way in which the transformation is applied:
.RS






.TP
\fB\-finalize\fR
.
Mark the stream as finished, ensuring that all bytes have been wholly
compressed or decompressed. For gzip streams, this also ensures that the
footer is written to the stream. The stream will need to be reset before
having more data written to it after this, though data can still be read out
of the stream with the \fBget\fR subcommand.





.TP
\fB\-flush\fR
.
Ensure that a decompressor consuming the bytes that the current (compressing)
stream is producing will be able to produce all the bytes that have been
compressed so far, at some performance penalty.





.TP
\fB\-fullflush\fR
.
Ensure that not only can a decompressor handle all the bytes produced so far
(as with \fB\-flush\fR above) but also that it can restart from this point if
it detects that the stream is partially corrupt. This incurs a substantial
performance penalty.





.RE
.TP
\fIstream \fBreset\fR
.
Puts any stream, including those that have been finalized or that have reached
eof, back into a state where it can process more data. Throws away all
internally buffered data.
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'\"
'\" Copyright (c) 2008-2012 Donal K. Fellows
'\"
'\" See the file "license.terms" for information on usage and redistribution
'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
'\" 
.so man.macros
.TH zlib n 8.6 Tcl "Tcl Built-In Commands"
.BS
................................................................................
The transformation will be a decompressing transformation that reads raw
compressed data from \fIchannel\fR, which must be readable.
.PP
The following options may be set when creating a transformation via
the
.QW "\fIoptions ...\fR"
to the \fBzlib push\fR command:
.TP
\fB\-dictionary\fI binData\fR
.VS "TIP 400"
Sets the compression dictionary to use when working with compressing or
decompressing the data to be \fIbinData\fR. Not valid for transformations that
work with gzip-format data.
.VE
.TP
\fB\-header\fI dictionary\fR
.
Passes a description of the gzip header to create, in the same format that
\fBzlib gzip\fR understands.
.TP
\fB\-level\fI compressionLevel\fR
.
How hard to compress the data. Must be an integer from 0 (uncompressed) to 9
(maximally compressed).
.TP
\fB\-limit\fI readaheadLimit\fR

.
The maximum number of bytes ahead to read when decompressing. This defaults to
1, which ensures that data is always decompressed correctly, but may be
increased to improve performance. This is more useful when the channel is
non-blocking.
.PP
Both compressing and decompressing channel transformations add extra
configuration options that may be accessed through \fBchan configure\fR. The

options are:
.TP
\fB\-checksum\fI checksum\fR
.
This read-only option gets the current checksum for the uncompressed data that
the compression engine has seen so far. It is valid for both compressing and
decompressing transforms, but not for the raw inflate and deflate formats. The
compression algorithm depends on what format is being produced or consumed.
.TP
\fB\-dictionary\fI binData\fR
.VS "TIP 400"
This read-write options gets or sets the compression dictionary to use when
working with compressing or decompressing the data to be \fIbinData\fR. It is
not valid for transformations that work with gzip-format data, and should not
normally be set on compressing transformations other than at the point where
the transformation is stacked.
.VE
.TP
\fB\-flush\fI type\fR
.
This write-only operation flushes the current state of the compressor to the
underlying channel. It is only valid for compressing transformations. The
\fItype\fR must be either \fBsync\fR or \fBfull\fR for a normal flush or an
expensive flush respectively. Flushing degrades the compression ratio, but
makes it easier for a decompressor to recover more of the file in the case of
data corruption.
.TP








\fB\-header\fI dictionary\fR
.
This read-only option, only valid for decompressing transforms that are
processing gzip-format data, returns the dictionary describing the header read
off the data stream.
.TP
\fB\-limit\fI readaheadLimit\fR
.
This read-write option is used by decompressing channels to control the
maximum number of bytes ahead to read from the underlying data source. This
defaults to 1, which ensures that data is always decompressed correctly, but
may be increased to improve performance. This is more useful when the channel
is non-blocking.
.RE
.SS "STREAMING SUBCOMMAND"
.TP
\fBzlib stream\fI mode\fR ?\fIoptions\fR?
.
Creates a streaming compression or decompression command based on the
\fImode\fR, and return the name of the command. For a description of how that
command works, see \fBSTREAMING INSTANCE COMMAND\fR below. The following modes
and \fIoptions\fR are supported:
.RS
.TP
\fBzlib stream compress\fR ?\fB\-dictionary \fIbindata\fR? ?\fB\-level \fIlevel\fR?
.
The stream will be a compressing stream that produces zlib-format output,
using compression level \fIlevel\fR (if specified) which will be an integer
from 0 to 9,
.VS "TIP 400"
and the compression dictionary \fIbindata\fR (if specified).
.VE
.TP
\fBzlib stream decompress\fR ?\fB\-dictionary \fIbindata\fR?
.
The stream will be a decompressing stream that takes zlib-format input and
produces uncompressed output.
.VS "TIP 400"
If \fIbindata\fR is supplied, it is a compression dictionary to use if
required.
.VE
.TP
\fBzlib stream deflate\fR ?\fB\-dictionary \fIbindata\fR? ?\fB\-level \fIlevel\fR?
.
The stream will be a compressing stream that produces raw output, using
compression level \fIlevel\fR (if specified) which will be an integer from 0
to 9,
.VS "TIP 400"
and the compression dictionary \fIbindata\fR (if specified). Note that
the raw compressed data includes no metadata about what compression
dictionary was used, if any; that is a feature of the zlib-format data.
.VE
.TP
\fBzlib stream gunzip\fR
.
The stream will be a decompressing stream that takes gzip-format input and
produces uncompressed output.
.TP
\fBzlib stream gzip\fR ?\fB\-header \fIheader\fR? ?\fB\-level \fIlevel\fR?
.
The stream will be a compressing stream that produces gzip-format output,
using compression level \fIlevel\fR (if specified) which will be an integer
from 0 to 9, and the header descriptor dictionary \fIheader\fR (if specified;
for keys see \fBzlib gzip\fR).
.TP
\fBzlib stream inflate\fR ?\fB\-dictionary \fIbindata\fR?
.
The stream will be a decompressing stream that takes raw compressed input and
produces uncompressed output.
.VS "TIP 400"
If \fIbindata\fR is supplied, it is a compression dictionary to use. Note that
there are no checks in place to determine whether the compression dictionary
is correct.
.VE
.RE
.SS "CHECKSUMMING SUBCOMMANDS"
.TP
\fBzlib adler32\fI string\fR ?\fIinitValue\fR?
.
Compute a checksum of binary string \fIstring\fR using the Adler-32 algorithm.
If given, \fIinitValue\fR is used to initialize the checksum engine.
................................................................................
command. They are used by calling their \fBput\fR subcommand one or more times
to load data in, and their \fBget\fR subcommand one or more times to extract
the transformed data.
.PP
The full set of subcommands supported by a streaming instance command,
\fIstream\fR, is as follows:
.TP
\fIstream \fBadd\fR ?\fIoption...\fR? \fIdata\fR
.
A short-cut for
.QW "\fIstream \fBput \fR?\fIoption...\fR? \fIdata\fR"
followed by
.QW "\fIstream \fBget\fR" .
.TP
\fIstream \fBchecksum\fR
.
Returns the checksum of the uncompressed data seen so far by this stream.
.TP
................................................................................
.QW "\fIstream \fBput \-fullflush {}\fR" .
.TP
\fIstream \fBget \fR?\fIcount\fR?
.
Return up to \fIcount\fR bytes from \fIstream\fR's internal buffers with the
transformation applied. If \fIcount\fR is omitted, the entire contents of the
buffers are returned.
.
\fIstream \fBheader\fR
.
Return the gzip header description dictionary extracted from the stream. Only
supported for streams created with their \fImode\fR parameter set to
\fBgunzip\fR.
.TP
\fIstream \fBput\fR ?\fIoption...\fR? \fIdata\fR
.
Append the contents of the binary string \fIdata\fR to \fIstream\fR's internal
buffers while applying the transformation. The following \fIoption\fRs are
supported (or an unambiguous prefix of them), which are used to modify the
way in which the transformation is applied:
.RS
.TP
\fB\-dictionary\fI binData\fR
.VS "TIP 400"
Sets the compression dictionary to use when working with compressing or
decompressing the data to be \fIbinData\fR.
.VE
.TP
\fB\-finalize\fR
.
Mark the stream as finished, ensuring that all bytes have been wholly
compressed or decompressed. For gzip streams, this also ensures that the
footer is written to the stream. The stream will need to be reset before
having more data written to it after this, though data can still be read out
of the stream with the \fBget\fR subcommand.
.RS
.PP
This option is mutually exclusive with the \fB\-flush\fR and \fB\-fullflush\fR
options.
.RE
.TP
\fB\-flush\fR
.
Ensure that a decompressor consuming the bytes that the current (compressing)
stream is producing will be able to produce all the bytes that have been
compressed so far, at some performance penalty.
.RS
.PP
This option is mutually exclusive with the \fB\-finalize\fR and
\fB\-fullflush\fR options.
.RE
.TP
\fB\-fullflush\fR
.
Ensure that not only can a decompressor handle all the bytes produced so far
(as with \fB\-flush\fR above) but also that it can restart from this point if
it detects that the stream is partially corrupt. This incurs a substantial
performance penalty.
.RS
.PP
This option is mutually exclusive with the \fB\-finalize\fR and \fB\-flush\fR
options.
.RE
.RE
.TP
\fIstream \fBreset\fR
.
Puts any stream, including those that have been finalized or that have reached
eof, back into a state where it can process more data. Throws away all
internally buffered data.

Changes to generic/tcl.decls.

2313
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declare 628 {
    void *Tcl_FindSymbol(Tcl_Interp *interp, Tcl_LoadHandle handle,
			 const char *symbol)
}
declare 629 {
    int Tcl_FSUnloadFile(Tcl_Interp *interp, Tcl_LoadHandle handlePtr)
}







# ----- BASELINE -- FOR -- 8.6.0 ----- #

##############################################################################

# Define the platform specific public Tcl interface. These functions are only
# available on the designated platform.






>
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>
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declare 628 {
    void *Tcl_FindSymbol(Tcl_Interp *interp, Tcl_LoadHandle handle,
			 const char *symbol)
}
declare 629 {
    int Tcl_FSUnloadFile(Tcl_Interp *interp, Tcl_LoadHandle handlePtr)
}

# TIP #400
declare 630 {
    void Tcl_ZlibStreamSetCompressionDictionary(Tcl_ZlibStream zhandle,
	    Tcl_Obj *compressionDictionaryObj)
}

# ----- BASELINE -- FOR -- 8.6.0 ----- #

##############################################################################

# Define the platform specific public Tcl interface. These functions are only
# available on the designated platform.

Changes to generic/tclDecls.h.

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				void *procPtrs, Tcl_LoadHandle *handlePtr);
/* 628 */
EXTERN void *		Tcl_FindSymbol(Tcl_Interp *interp,
				Tcl_LoadHandle handle, const char *symbol);
/* 629 */
EXTERN int		Tcl_FSUnloadFile(Tcl_Interp *interp,
				Tcl_LoadHandle handlePtr);





typedef struct TclStubHooks {
    const struct TclPlatStubs *tclPlatStubs;
    const struct TclIntStubs *tclIntStubs;
    const struct TclIntPlatStubs *tclIntPlatStubs;
} TclStubHooks;

................................................................................
    Tcl_Obj * (*tcl_GetStartupScript) (const char **encodingPtr); /* 623 */
    int (*tcl_CloseEx) (Tcl_Interp *interp, Tcl_Channel chan, int flags); /* 624 */
    int (*tcl_NRExprObj) (Tcl_Interp *interp, Tcl_Obj *objPtr, Tcl_Obj *resultPtr); /* 625 */
    int (*tcl_NRSubstObj) (Tcl_Interp *interp, Tcl_Obj *objPtr, int flags); /* 626 */
    int (*tcl_LoadFile) (Tcl_Interp *interp, Tcl_Obj *pathPtr, const char *const symv[], int flags, void *procPtrs, Tcl_LoadHandle *handlePtr); /* 627 */
    void * (*tcl_FindSymbol) (Tcl_Interp *interp, Tcl_LoadHandle handle, const char *symbol); /* 628 */
    int (*tcl_FSUnloadFile) (Tcl_Interp *interp, Tcl_LoadHandle handlePtr); /* 629 */

} TclStubs;

#ifdef __cplusplus
extern "C" {
#endif
extern const TclStubs *tclStubsPtr;
#ifdef __cplusplus
................................................................................
	(tclStubsPtr->tcl_NRSubstObj) /* 626 */
#define Tcl_LoadFile \
	(tclStubsPtr->tcl_LoadFile) /* 627 */
#define Tcl_FindSymbol \
	(tclStubsPtr->tcl_FindSymbol) /* 628 */
#define Tcl_FSUnloadFile \
	(tclStubsPtr->tcl_FSUnloadFile) /* 629 */



#endif /* defined(USE_TCL_STUBS) */

/* !END!: Do not edit above this line. */

#if defined(USE_TCL_STUBS)
#   undef Tcl_CreateInterp






>
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>







 







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				void *procPtrs, Tcl_LoadHandle *handlePtr);
/* 628 */
EXTERN void *		Tcl_FindSymbol(Tcl_Interp *interp,
				Tcl_LoadHandle handle, const char *symbol);
/* 629 */
EXTERN int		Tcl_FSUnloadFile(Tcl_Interp *interp,
				Tcl_LoadHandle handlePtr);
/* 630 */
EXTERN void		Tcl_ZlibStreamSetCompressionDictionary(
				Tcl_ZlibStream zhandle,
				Tcl_Obj *compressionDictionaryObj);

typedef struct TclStubHooks {
    const struct TclPlatStubs *tclPlatStubs;
    const struct TclIntStubs *tclIntStubs;
    const struct TclIntPlatStubs *tclIntPlatStubs;
} TclStubHooks;

................................................................................
    Tcl_Obj * (*tcl_GetStartupScript) (const char **encodingPtr); /* 623 */
    int (*tcl_CloseEx) (Tcl_Interp *interp, Tcl_Channel chan, int flags); /* 624 */
    int (*tcl_NRExprObj) (Tcl_Interp *interp, Tcl_Obj *objPtr, Tcl_Obj *resultPtr); /* 625 */
    int (*tcl_NRSubstObj) (Tcl_Interp *interp, Tcl_Obj *objPtr, int flags); /* 626 */
    int (*tcl_LoadFile) (Tcl_Interp *interp, Tcl_Obj *pathPtr, const char *const symv[], int flags, void *procPtrs, Tcl_LoadHandle *handlePtr); /* 627 */
    void * (*tcl_FindSymbol) (Tcl_Interp *interp, Tcl_LoadHandle handle, const char *symbol); /* 628 */
    int (*tcl_FSUnloadFile) (Tcl_Interp *interp, Tcl_LoadHandle handlePtr); /* 629 */
    void (*tcl_ZlibStreamSetCompressionDictionary) (Tcl_ZlibStream zhandle, Tcl_Obj *compressionDictionaryObj); /* 630 */
} TclStubs;

#ifdef __cplusplus
extern "C" {
#endif
extern const TclStubs *tclStubsPtr;
#ifdef __cplusplus
................................................................................
	(tclStubsPtr->tcl_NRSubstObj) /* 626 */
#define Tcl_LoadFile \
	(tclStubsPtr->tcl_LoadFile) /* 627 */
#define Tcl_FindSymbol \
	(tclStubsPtr->tcl_FindSymbol) /* 628 */
#define Tcl_FSUnloadFile \
	(tclStubsPtr->tcl_FSUnloadFile) /* 629 */
#define Tcl_ZlibStreamSetCompressionDictionary \
	(tclStubsPtr->tcl_ZlibStreamSetCompressionDictionary) /* 630 */

#endif /* defined(USE_TCL_STUBS) */

/* !END!: Do not edit above this line. */

#if defined(USE_TCL_STUBS)
#   undef Tcl_CreateInterp

Changes to generic/tclStubInit.c.

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    Tcl_GetStartupScript, /* 623 */
    Tcl_CloseEx, /* 624 */
    Tcl_NRExprObj, /* 625 */
    Tcl_NRSubstObj, /* 626 */
    Tcl_LoadFile, /* 627 */
    Tcl_FindSymbol, /* 628 */
    Tcl_FSUnloadFile, /* 629 */

};

/* !END!: Do not edit above this line. */






>



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    Tcl_GetStartupScript, /* 623 */
    Tcl_CloseEx, /* 624 */
    Tcl_NRExprObj, /* 625 */
    Tcl_NRSubstObj, /* 626 */
    Tcl_LoadFile, /* 627 */
    Tcl_FindSymbol, /* 628 */
    Tcl_FSUnloadFile, /* 629 */
    Tcl_ZlibStreamSetCompressionDictionary, /* 630 */
};

/* !END!: Do not edit above this line. */

Changes to generic/tclZlib.c.

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2692
....
2712
2713
2714
2715
2716
2717
2718

2719







2720
2721
2722
2723
2724
2725
2726
....
2857
2858
2859
2860
2861
2862
2863


2864
2865
2866
2867



2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879


2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901






2902
2903
2904
2905
2906
2907
2908
....
2925
2926
2927
2928
2929
2930
2931








2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944






2945
2946
2947
2948
2949
2950
2951
....
2962
2963
2964
2965
2966
2967
2968



2969
2970
2971
2972
2973
2974
2975
....
3051
3052
3053
3054
3055
3056
3057

3058
3059
3060
3061
3062
3063
3064
3065
3066












3067
3068
3069
3070
3071
3072
3073
....
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114











3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126


3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139

















3140
3141
3142
3143
3144
3145
3146
....
3254
3255
3256
3257
3258
3259
3260








3261
3262
3263
3264
3265
3266
3267
3268
3269
/*
 * tclZlib.c --
 *
 *	This file provides the interface to the Zlib library.
 *
 * Copyright (C) 2004-2005 Pascal Scheffers <[email protected]>
 * Copyright (C) 2005 Unitas Software B.V.
 * Copyright (c) 2008-2009 Donal K. Fellows
 *
 * Parts written by Jean-Claude Wippler, as part of Tclkit, placed in the
 * public domain March 2003.
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */
................................................................................
    int format;			/* Flags from the TCL_ZLIB_FORMAT_* */
    int level;			/* Default 5, 0-9 */
    int flush;			/* Stores the flush param for deferred the
				 * decompression. */
    int wbits;			/* The encoded compression mode, so we can
				 * restart the stream if necessary. */
    Tcl_Command cmd;		/* Token for the associated Tcl command. */






} ZlibStreamHandle;














/*
 * Structure used for stacked channel compression and decompression.
 */

typedef struct {
    Tcl_Channel chan;		/* Reference to the channel itself. */
    Tcl_Channel parent;		/* The underlying source and sink of bytes. */
    int flags;			/* General flag bits, see below... */
    int mode;			/* Either the value TCL_ZLIB_STREAM_DEFLATE
				 * for compression on output, or
				 * TCL_ZLIB_STREAM_INFLATE for decompression
				 * on input. */





    z_stream inStream;		/* Structure used by zlib for decompression of
				 * input. */
    z_stream outStream;		/* Structure used by zlib for compression of
				 * output. */
    char *inBuffer, *outBuffer;	/* Working buffers. */
    int inAllocated, outAllocated;
				/* Sizes of working buffers. */
    GzipHeader inHeader;	/* Header read from input stream, when
				 * decompressing a gzip stream. */
    GzipHeader outHeader;	/* Header to write to an output stream, when
				 * compressing a gzip stream. */
    Tcl_TimerToken timer;	/* Timer used for keeping events fresh. */
    Tcl_DString decompressed;	/* Buffer for decompression results. */



} ZlibChannelData;

/*
 * Value bits for the flags field. Definitions are:
 *	ASYNC -		Whether this is an asynchronous channel.
 *	IN_HEADER -	Whether the inHeader field has been registered with
 *			the input compressor.
................................................................................
 */

#define ASYNC			0x1
#define IN_HEADER		0x2
#define OUT_HEADER		0x4

/*
 * Size of buffers allocated by default. Should be enough...



 */

#define DEFAULT_BUFFER_SIZE	4096



/*
 * Prototypes for private procedures defined later in this file:
 */

static Tcl_CmdDeleteProc	ZlibStreamCmdDelete;
static Tcl_DriverBlockModeProc	ZlibTransformBlockMode;
................................................................................
static Tcl_DriverHandlerProc	ZlibTransformEventHandler;
static Tcl_DriverInputProc	ZlibTransformInput;
static Tcl_DriverOutputProc	ZlibTransformOutput;
static Tcl_DriverSetOptionProc	ZlibTransformSetOption;
static Tcl_DriverWatchProc	ZlibTransformWatch;
static Tcl_ObjCmdProc		ZlibCmd;
static Tcl_ObjCmdProc		ZlibStreamCmd;




static void		ConvertError(Tcl_Interp *interp, int code);


static void		ExtractHeader(gz_header *headerPtr, Tcl_Obj *dictObj);
static int		GenerateHeader(Tcl_Interp *interp, Tcl_Obj *dictObj,
			    GzipHeader *headerPtr, int *extraSizePtr);


static inline int	ResultCopy(ZlibChannelData *cd, char *buf,
			    int toRead);
static int		ResultGenerate(ZlibChannelData *cd, int n, int flush,
			    int *errorCodePtr);
static Tcl_Channel	ZlibStackChannelTransform(Tcl_Interp *interp,
			    int mode, int format, int level,
			    Tcl_Channel channel, Tcl_Obj *gzipHeaderDictPtr);

static void		ZlibStreamCleanup(ZlibStreamHandle *zshPtr);


static inline void	ZlibTransformEventTimerKill(ZlibChannelData *cd);
static void		ZlibTransformTimerRun(ClientData clientData);

/*
 * Type of zlib-based compressing and decompressing channels.
 */

................................................................................
 *----------------------------------------------------------------------
 */

static void
ConvertError(
    Tcl_Interp *interp,		/* Interpreter to store the error in. May be
				 * NULL, in which case nothing happens. */
    int code)			/* The zlib error code. */

{



    if (interp == NULL) {
	return;
    }









    if (code == Z_ERRNO) {
	Tcl_SetObjResult(interp, Tcl_NewStringObj(Tcl_PosixError(interp),-1));
    } else {
	const char *codeStr, *codeStr2 = NULL;
	char codeStrBuf[TCL_INTEGER_SPACE];


	switch (code) {






	case Z_STREAM_ERROR:	codeStr = "STREAM";	break;


	case Z_DATA_ERROR:	codeStr = "DATA";	break;


	case Z_MEM_ERROR:	codeStr = "MEM";	break;


	case Z_BUF_ERROR:	codeStr = "BUF";	break;


	case Z_VERSION_ERROR:	codeStr = "VERSION";	break;























	default:
	    codeStr = "unknown";
	    codeStr2 = codeStrBuf;
	    sprintf(codeStrBuf, "%d", code);
	    break;
	}
	Tcl_SetObjResult(interp, Tcl_NewStringObj(zError(code), -1));

	/*
	 * Tricky point! We might pass NULL twice here (and will when the
	 * error type is known).
	 */

	Tcl_SetErrorCode(interp, "TCL", "ZLIB", codeStr, codeStr2, NULL);























































    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * GenerateHeader --
................................................................................
    } else if (value != NULL) {
	valueStr = Tcl_GetStringFromObj(value, &len);
	Tcl_UtfToExternal(NULL, latin1enc, valueStr, len, 0, NULL,
		headerPtr->nativeCommentBuf, MAX_COMMENT_LEN-1, NULL, &len,
		NULL);
	headerPtr->nativeCommentBuf[len] = '\0';
	headerPtr->header.comment = (Bytef *) headerPtr->nativeCommentBuf;

	*extraSizePtr += len;

    }

    if (GetValue(interp, dictObj, "crc", &value) != TCL_OK) {
	goto error;
    } else if (value != NULL &&
	    Tcl_GetBooleanFromObj(interp, value, &headerPtr->header.hcrc)) {
	goto error;
................................................................................
	goto error;
    } else if (value != NULL) {
	valueStr = Tcl_GetStringFromObj(value, &len);
	Tcl_UtfToExternal(NULL, latin1enc, valueStr, len, 0, NULL,
		headerPtr->nativeFilenameBuf, MAXPATHLEN-1, NULL, &len, NULL);
	headerPtr->nativeFilenameBuf[len] = '\0';
	headerPtr->header.name = (Bytef *) headerPtr->nativeFilenameBuf;

	*extraSizePtr += len;

    }

    if (GetValue(interp, dictObj, "os", &value) != TCL_OK) {
	goto error;
    } else if (value != NULL && Tcl_GetIntFromObj(interp, value,
	    &headerPtr->header.os) != TCL_OK) {
	goto error;
................................................................................
		Tcl_NewStringObj(headerPtr->text ? "text" : "binary", -1));
    }

    if (latin1enc != NULL) {
	Tcl_FreeEncoding(latin1enc);
    }
}




























 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_ZlibStreamInit --
 *
 *	This command initializes a (de)compression context/handle for
................................................................................
    Tcl_ZlibStream *zshandlePtr)
{
    int wbits = 0;
    int e;
    ZlibStreamHandle *zshPtr = NULL;
    Tcl_DString cmdname;
    Tcl_CmdInfo cmdinfo;


    switch (mode) {
    case TCL_ZLIB_STREAM_DEFLATE:
	/*
	 * Compressed format is specified by the wbits parameter. See zlib.h
	 * for details.
	 */
................................................................................

	switch (format) {
	case TCL_ZLIB_FORMAT_RAW:
	    wbits = WBITS_RAW;
	    break;
	case TCL_ZLIB_FORMAT_GZIP:
	    wbits = WBITS_GZIP;









	    break;
	case TCL_ZLIB_FORMAT_ZLIB:
	    wbits = WBITS_ZLIB;
	    break;
	default:
	    Tcl_Panic("incorrect zlib data format, must be "
		    "TCL_ZLIB_FORMAT_ZLIB, TCL_ZLIB_FORMAT_GZIP or "
................................................................................

	switch (format) {
	case TCL_ZLIB_FORMAT_RAW:
	    wbits = WBITS_RAW;
	    break;
	case TCL_ZLIB_FORMAT_GZIP:
	    wbits = WBITS_GZIP;








	    break;
	case TCL_ZLIB_FORMAT_ZLIB:
	    wbits = WBITS_ZLIB;
	    break;
	case TCL_ZLIB_FORMAT_AUTO:
	    wbits = WBITS_AUTODETECT;
	    break;
................................................................................
    zshPtr->interp = interp;
    zshPtr->mode = mode;
    zshPtr->format = format;
    zshPtr->level = level;
    zshPtr->wbits = wbits;
    zshPtr->currentInput = NULL;
    zshPtr->streamEnd = 0;



    memset(&zshPtr->stream, 0, sizeof(z_stream));
    zshPtr->stream.adler = 1;

    /*
     * No output buffer available yet
     */

    if (mode == TCL_ZLIB_STREAM_DEFLATE) {
	e = deflateInit2(&zshPtr->stream, level, Z_DEFLATED, wbits,
		MAX_MEM_LEVEL, Z_DEFAULT_STRATEGY);




    } else {
	e = inflateInit2(&zshPtr->stream, wbits);




    }

    if (e != Z_OK) {
	ConvertError(interp, e);
	goto error;
    }

    /*
     * I could do all this in C, but this is easier.
     */

................................................................................
     */

    if (zshandlePtr) {
	*zshandlePtr = (Tcl_ZlibStream) zshPtr;
    }

    return TCL_OK;

 error:






    ckfree(zshPtr);
    return TCL_ERROR;
}
 
/*
 *----------------------------------------------------------------------
 *
................................................................................
    }
    if (zshPtr->outData) {
	Tcl_DecrRefCount(zshPtr->outData);
    }
    if (zshPtr->currentInput) {
	Tcl_DecrRefCount(zshPtr->currentInput);
    }







    ckfree(zshPtr);
}
 
/*
 *----------------------------------------------------------------------
 *
................................................................................
    /*
     * No output buffer available yet.
     */

    if (zshPtr->mode == TCL_ZLIB_STREAM_DEFLATE) {
	e = deflateInit2(&zshPtr->stream, zshPtr->level, Z_DEFLATED,
		zshPtr->wbits, MAX_MEM_LEVEL, Z_DEFAULT_STRATEGY);






    } else {
	e = inflateInit2(&zshPtr->stream, zshPtr->wbits);






    }

    if (e != Z_OK) {
	ConvertError(zshPtr->interp, e);
	/* TODO:cleanup */
	return TCL_ERROR;
    }

    return TCL_OK;
}
 
................................................................................

    return zshPtr->stream.adler;
}
 
/*
 *----------------------------------------------------------------------
 *



































 * Tcl_ZlibStreamPut --
 *
 *	Add data to the stream for compression or decompression from a
 *	bytearray Tcl_Obj.
 *
 *----------------------------------------------------------------------
 */
................................................................................
	}
	return TCL_ERROR;
    }

    if (zshPtr->mode == TCL_ZLIB_STREAM_DEFLATE) {
	zshPtr->stream.next_in = Tcl_GetByteArrayFromObj(data, &size);
	zshPtr->stream.avail_in = size;












	/*
	 * Deflatebound doesn't seem to take various header sizes into
	 * account, so we add 100 extra bytes.
	 */

	outSize = deflateBound(&zshPtr->stream, zshPtr->stream.avail_in)+100;
................................................................................
		ckfree(dataTmp);
		dataTmp = ckalloc(outSize);
	    }
	    zshPtr->stream.avail_out = outSize;
	    zshPtr->stream.next_out = (Bytef *) dataTmp;

	    e = deflate(&zshPtr->stream, flush);






	}

	/*
	 * And append the final data block.
	 */

	if (outSize - zshPtr->stream.avail_out > 0) {
................................................................................
    if (zshPtr->mode == TCL_ZLIB_STREAM_INFLATE) {
	if (count == -1) {
	    /*
	     * The only safe thing to do is restict to 65k. We might cause a
	     * panic for out of memory if we just kept growing the buffer.
	     */

	    count = 65536;
	}

	/*
	 * Prepare the place to store the data.
	 */

	dataPtr = Tcl_SetByteArrayLength(data, existing+count);
................................................................................
		 * And remove it from the list
		 */

		Tcl_ListObjReplace(NULL, zshPtr->inData, 0, 1, 0, NULL);
	    }
	}

















	e = inflate(&zshPtr->stream, zshPtr->flush);







	Tcl_ListObjLength(NULL, zshPtr->inData, &listLen);

	while ((zshPtr->stream.avail_out > 0)
		&& (e == Z_OK || e == Z_BUF_ERROR) && (listLen > 0)) {
	    /*
	     * State: We have not satisfied the request yet and there may be
	     * more to inflate.
................................................................................
	    Tcl_ListObjReplace(NULL, zshPtr->inData, 0, 1, 0, NULL);
	    listLen--;

	    /*
	     * And call inflate again.
	     */


	    e = inflate(&zshPtr->stream, zshPtr->flush);






	}
	if (zshPtr->stream.avail_out > 0) {
	    Tcl_SetByteArrayLength(data,
		    existing + count - zshPtr->stream.avail_out);
	}
	if (!(e==Z_OK || e==Z_STREAM_END || e==Z_BUF_ERROR)) {
	    Tcl_SetByteArrayLength(data, existing);
	    ConvertError(zshPtr->interp, e);
	    return TCL_ERROR;
	}
	if (e == Z_STREAM_END) {
	    zshPtr->streamEnd = 1;
	    if (zshPtr->currentInput) {
		Tcl_DecrRefCount(zshPtr->currentInput);
		zshPtr->currentInput = 0;
................................................................................
     */

    Tcl_SetByteArrayLength(obj, stream.total_out);
    Tcl_SetObjResult(interp, obj);
    return TCL_OK;

  error:
    ConvertError(interp, e);
    TclDecrRefCount(obj);
    return TCL_ERROR;
}
 
/*
 *----------------------------------------------------------------------
 *
................................................................................
	ckfree(commentBuf);
    }
    Tcl_SetObjResult(interp, obj);
    return TCL_OK;

  error:
    TclDecrRefCount(obj);
    ConvertError(interp, e);
    if (nameBuf) {
	ckfree(nameBuf);
    }
    if (commentBuf) {
	ckfree(commentBuf);
    }
    return TCL_ERROR;
................................................................................
static int
ZlibCmd(
    ClientData notUsed,
    Tcl_Interp *interp,
    int objc,
    Tcl_Obj *const objv[])
{
    int command, dlen, mode, format, i, option, level = -1;
    unsigned start, buffersize = 0;
    Tcl_ZlibStream zh;
    Byte *data;
    Tcl_Obj *headerDictObj, *headerVarObj;
    const char *extraInfoStr = NULL;
    static const char *const commands[] = {
	"adler32", "compress", "crc32", "decompress", "deflate", "gunzip",
	"gzip", "inflate", "push", "stream",
	NULL
    };
    enum zlibCommands {
	CMD_ADLER, CMD_COMPRESS, CMD_CRC, CMD_DECOMPRESS, CMD_DEFLATE,
	CMD_GUNZIP, CMD_GZIP, CMD_INFLATE, CMD_PUSH, CMD_STREAM
    };
    static const char *const stream_formats[] = {
	"compress", "decompress", "deflate", "gunzip", "gzip", "inflate",
	NULL
    };
    enum zlibFormats {
	FMT_COMPRESS, FMT_DECOMPRESS, FMT_DEFLATE, FMT_GUNZIP, FMT_GZIP,
	FMT_INFLATE
    };

    if (objc < 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "command arg ?...?");
	return TCL_ERROR;
    }
    if (Tcl_GetIndexFromObj(interp, objv[1], commands, "command", 0,
	    &command) != TCL_OK) {
................................................................................
	    return TCL_ERROR;
	}
	if (objc < 4) {
	    start = Tcl_ZlibAdler32(0, NULL, 0);
	}
	data = Tcl_GetByteArrayFromObj(objv[2], &dlen);
	Tcl_SetObjResult(interp, Tcl_NewWideIntObj((Tcl_WideInt)
		Tcl_ZlibAdler32(start, data, dlen)));
	return TCL_OK;
    case CMD_CRC:			/* crc32 str ?startvalue?
					 * -> checksum */
	if (objc < 3 || objc > 4) {
	    Tcl_WrongNumArgs(interp, 2, objv, "data ?startValue?");
	    return TCL_ERROR;
	}
................................................................................
	    return TCL_ERROR;
	}
	if (objc < 4) {
	    start = Tcl_ZlibCRC32(0, NULL, 0);
	}
	data = Tcl_GetByteArrayFromObj(objv[2], &dlen);
	Tcl_SetObjResult(interp, Tcl_NewWideIntObj((Tcl_WideInt)
		Tcl_ZlibCRC32(start, data, dlen)));
	return TCL_OK;
    case CMD_DEFLATE:			/* deflate data ?level?
					 * -> rawCompressedData */
	if (objc < 3 || objc > 4) {
	    Tcl_WrongNumArgs(interp, 2, objv, "data ?level?");
	    return TCL_ERROR;
	}
................................................................................
		goto badLevel;
	    }
	}
	return Tcl_ZlibDeflate(interp, TCL_ZLIB_FORMAT_ZLIB, objv[2], level,
		NULL);
    case CMD_GZIP:			/* gzip data ?level?
					 * -> gzippedCompressedData */
















	if (objc < 3 || objc > 7 || ((objc & 1) == 0)) {
	    Tcl_WrongNumArgs(interp, 2, objv,
		    "data ?-level level? ?-header header?");
	    return TCL_ERROR;
	}
	headerDictObj = NULL;
	for (i=3 ; i<objc ; i+=2) {
	    static const char *const gzipopts[] = {
		"-header", "-level", NULL
	    };

	    if (Tcl_GetIndexFromObj(interp, objv[i], gzipopts, "option", 0,
		    &option) != TCL_OK) {
................................................................................
	    return TCL_ERROR;
	}
	if (objc > 3) {
	    if (Tcl_GetIntFromObj(interp, objv[3],
		    (int *) &buffersize) != TCL_OK) {
		return TCL_ERROR;
	    }

	    if (buffersize < 16 || buffersize > 65536) {
		goto badBuffer;
	    }
	}
	return Tcl_ZlibInflate(interp, TCL_ZLIB_FORMAT_RAW, objv[2],
		buffersize, NULL);
    case CMD_DECOMPRESS:		/* decompress zlibcomprdata \
					 *    ?bufferSize?
................................................................................
	    return TCL_ERROR;
	}
	if (objc > 3) {
	    if (Tcl_GetIntFromObj(interp, objv[3],
		    (int *) &buffersize) != TCL_OK) {
		return TCL_ERROR;
	    }

	    if (buffersize < 16 || buffersize > 65536) {
		goto badBuffer;
	    }
	}
	return Tcl_ZlibInflate(interp, TCL_ZLIB_FORMAT_ZLIB, objv[2],
		buffersize, NULL);
    case CMD_GUNZIP:			/* gunzip gzippeddata ?bufferSize?
					 *	-> decompressedData */


	if (objc < 3 || objc > 5 || ((objc & 1) == 0)) {
	    Tcl_WrongNumArgs(interp, 2, objv, "data ?-headerVar varName?");
	    return TCL_ERROR;
	}
	headerDictObj = headerVarObj = NULL;
	for (i=3 ; i<objc ; i+=2) {
	    static const char *const gunzipopts[] = {
................................................................................
	    }
	    switch (option) {
	    case 0:
		if (Tcl_GetIntFromObj(interp, objv[i+1],
			(int *) &buffersize) != TCL_OK) {
		    return TCL_ERROR;
		}

		if (buffersize < 16 || buffersize > 65536) {
		    goto badBuffer;
		}
		break;
	    case 1:
		headerVarObj = objv[i+1];
		headerDictObj = Tcl_NewObj();
		break;
................................................................................
		headerDictObj, TCL_LEAVE_ERR_MSG) == NULL) {
	    if (headerDictObj) {
		TclDecrRefCount(headerDictObj);
	    }
	    return TCL_ERROR;
	}
	return TCL_OK;

    case CMD_STREAM:			/* stream deflate/inflate/...gunzip \
					 *    ?level?
					 *	-> handleCmd */











































































	if (objc < 3 || objc > 4) {
	    Tcl_WrongNumArgs(interp, 2, objv, "mode ?level?");
	    return TCL_ERROR;
	}
	if (Tcl_GetIndexFromObj(interp, objv[2], stream_formats, "mode", 0,
		&format) != TCL_OK) {
	    return TCL_ERROR;
	}
	mode = TCL_ZLIB_STREAM_INFLATE;






	switch ((enum zlibFormats) format) {
	case FMT_DEFLATE:

	    mode = TCL_ZLIB_STREAM_DEFLATE;


	case FMT_INFLATE:


	    format = TCL_ZLIB_FORMAT_RAW;
	    break;
	case FMT_COMPRESS:

	    mode = TCL_ZLIB_STREAM_DEFLATE;


	case FMT_DECOMPRESS:


	    format = TCL_ZLIB_FORMAT_ZLIB;
	    break;
	case FMT_GZIP:

	    mode = TCL_ZLIB_STREAM_DEFLATE;


	case FMT_GUNZIP:


	    format = TCL_ZLIB_FORMAT_GZIP;
	    break;


	}
	if (objc == 4) {
	    if (Tcl_GetIntFromObj(interp, objv[3],
		    (int *) &level) != TCL_OK) {








		return TCL_ERROR;
	    }
	    if (level < 0 || level > 9) {
		goto badLevel;

	    }
	} else {













	    level = Z_DEFAULT_COMPRESSION;







	}





	if (Tcl_ZlibStreamInit(interp, mode, format, level, NULL,
		&zh) != TCL_OK) {
	    return TCL_ERROR;
	}



	Tcl_SetObjResult(interp, Tcl_ZlibStreamGetCommandName(zh));
	return TCL_OK;
    case CMD_PUSH: {			/* push mode channel options...
					 *	-> channel */


























	Tcl_Channel chan;
	int chanMode;
	static const char *const pushOptions[] = {



	    "-header", "-level", "-limit",
	    NULL
	};

	enum pushOptions {poHeader, poLevel, poLimit};
	Tcl_Obj *headerObj = NULL;
	int limit = 1, dummy;

	if (objc < 4) {
	    Tcl_WrongNumArgs(interp, 2, objv, "mode channel ?options...?");
	    return TCL_ERROR;
	}

	if (Tcl_GetIndexFromObj(interp, objv[2], stream_formats, "mode", 0,
		&format) != TCL_OK) {
	    return TCL_ERROR;
	}
	switch ((enum zlibFormats) format) {
	case FMT_DEFLATE:
	    mode = TCL_ZLIB_STREAM_DEFLATE;
	    format = TCL_ZLIB_FORMAT_RAW;

	    break;
	case FMT_INFLATE:
	    mode = TCL_ZLIB_STREAM_INFLATE;
	    format = TCL_ZLIB_FORMAT_RAW;
	    break;
	case FMT_COMPRESS:
	    mode = TCL_ZLIB_STREAM_DEFLATE;
	    format = TCL_ZLIB_FORMAT_ZLIB;

	    break;
	case FMT_DECOMPRESS:
	    mode = TCL_ZLIB_STREAM_INFLATE;
	    format = TCL_ZLIB_FORMAT_ZLIB;
	    break;
	case FMT_GZIP:
	    mode = TCL_ZLIB_STREAM_DEFLATE;
	    format = TCL_ZLIB_FORMAT_GZIP;

	    break;
	case FMT_GUNZIP:
	    mode = TCL_ZLIB_STREAM_INFLATE;
	    format = TCL_ZLIB_FORMAT_GZIP;
	    break;
	default:
	    Tcl_SetObjResult(interp, Tcl_NewStringObj("impossible!", -1));
	    return TCL_ERROR;

	}

	if (TclGetChannelFromObj(interp, objv[3], &chan, &chanMode,
		0) != TCL_OK) {
	    return TCL_ERROR;
	}

	/*
	 * Sanity checks.
	 */

	if (mode == TCL_ZLIB_STREAM_DEFLATE && !(chanMode & TCL_WRITABLE)) {
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
		    "compression may only be applied to writable channels",
		    -1));
	    Tcl_SetErrorCode(interp, "TCL", "ZIP", "UNWRITABLE", NULL);
	    return TCL_ERROR;
	}
	if (mode == TCL_ZLIB_STREAM_INFLATE && !(chanMode & TCL_READABLE)) {
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
		    "decompression may only be applied to readable channels",
		    -1));
	    Tcl_SetErrorCode(interp, "TCL", "ZIP", "UNREADABLE", NULL);
	    return TCL_ERROR;
	}

	/*
	 * Parse options.
	 */

	level = Z_DEFAULT_COMPRESSION;
	for (i=4 ; i<objc ; i++) {
	    if (Tcl_GetIndexFromObj(interp, objv[i], pushOptions, "option", 0,
		    &option) != TCL_OK) {
		return TCL_ERROR;
	    }
	    switch ((enum pushOptions) option) {
	    case poHeader:
		if (++i > objc-1) {
		    Tcl_SetObjResult(interp, Tcl_NewStringObj(
			    "value missing for -header option", -1));
		    Tcl_SetErrorCode(interp, "TCL", "ZIP", "NOVAL", NULL);
		    return TCL_ERROR;
		}


		headerObj = objv[i];
		if (Tcl_DictObjSize(interp, headerObj, &dummy) != TCL_OK) {
		    Tcl_AddErrorInfo(interp, "\n    (in -header option)");
		    return TCL_ERROR;

		}
		break;
	    case poLevel:
		if (++i > objc-1) {




		    Tcl_SetObjResult(interp, Tcl_NewStringObj(
			    "value missing for -level option", -1));

		    Tcl_SetErrorCode(interp, "TCL", "ZIP", "NOVAL", NULL);
		    return TCL_ERROR;


		}


		if (Tcl_GetIntFromObj(interp, objv[i],
			(int *) &level) != TCL_OK) {
		    Tcl_AddErrorInfo(interp, "\n    (in -level option)");
		    return TCL_ERROR;

		}
		if (level < 0 || level > 9) {
		    extraInfoStr = "\n    (in -level option)";
		    goto badLevel;






		}
		break;
	    case poLimit:
		if (++i > objc-1) {

		    Tcl_SetObjResult(interp, Tcl_NewStringObj(
			    "value missing for -limit option", -1));


		    Tcl_SetErrorCode(interp, "TCL", "ZIP", "NOVAL", NULL);
		    return TCL_ERROR;

		}
		if (Tcl_GetIntFromObj(interp, objv[i],
			(int *) &limit) != TCL_OK) {
		    Tcl_AddErrorInfo(interp, "\n    (in -limit option)");
		    return TCL_ERROR;
		}
		if (limit < 1) {
		    limit = 1;
		}

		break;
	    }
	}

	if (ZlibStackChannelTransform(interp, mode, format, level, chan,
		headerObj) == NULL) {
	    return TCL_ERROR;
	}
	Tcl_SetObjResult(interp, objv[3]);
	return TCL_OK;
    }
    };

    return TCL_ERROR;

  badLevel:
    Tcl_SetObjResult(interp, Tcl_NewStringObj("level must be 0 to 9", -1));
    Tcl_SetErrorCode(interp, "TCL", "VALUE", "COMPRESSIONLEVEL", NULL);
    if (extraInfoStr) {



	Tcl_AddErrorInfo(interp, extraInfoStr);
    }
    return TCL_ERROR;
  badBuffer:
    Tcl_SetObjResult(interp, Tcl_NewStringObj(
	    "buffer size must be 32 to 65536", -1));
    Tcl_SetErrorCode(interp, "TCL", "VALUE", "BUFFERSIZE", NULL);
    return TCL_ERROR;
}
 
/*
 *----------------------------------------------------------------------
 *
 * ZlibStreamCmd --
 *
 *	Implementation of the commands returned by [zlib stream].
................................................................................
ZlibStreamCmd(
    ClientData cd,
    Tcl_Interp *interp,
    int objc,
    Tcl_Obj *const objv[])
{
    Tcl_ZlibStream zstream = cd;
    int command, index, count, code, buffersize = -1, flush = -1, i;
    Tcl_Obj *obj;
    static const char *const cmds[] = {
	"add", "checksum", "close", "eof", "finalize", "flush",
	"fullflush", "get", "put", "reset",
	NULL
    };
    enum zlibStreamCommands {
	zs_add, zs_checksum, zs_close, zs_eof, zs_finalize, zs_flush,
	zs_fullflush, zs_get, zs_put, zs_reset
    };
    static const char *const add_options[] = {
	"-buffer", "-finalize", "-flush", "-fullflush", NULL
    };
    enum addOptions {
	ao_buffer, ao_finalize, ao_flush, ao_fullflush
    };

    if (objc < 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "option data ?...?");
	return TCL_ERROR;
    }

................................................................................
    if (Tcl_GetIndexFromObj(interp, objv[1], cmds, "option", 0,
	    &command) != TCL_OK) {
	return TCL_ERROR;
    }

    switch ((enum zlibStreamCommands) command) {
    case zs_add:		/* $strm add ?$flushopt? $data */
	for (i=2; i<objc-1; i++) {
	    if (Tcl_GetIndexFromObj(interp, objv[i], add_options, "option", 0,
		    &index) != TCL_OK) {
		return TCL_ERROR;
	    }

	    switch ((enum addOptions) index) {
	    case ao_flush: /* -flush */
		if (flush > -1) {
		    flush = -2;
		} else {
		    flush = Z_SYNC_FLUSH;
		}
		break;
	    case ao_fullflush: /* -fullflush */
		if (flush > -1) {
		    flush = -2;
		} else {
		    flush = Z_FULL_FLUSH;
		}
		break;
	    case ao_finalize: /* -finalize */
		if (flush > -1) {
		    flush = -2;
		} else {
		    flush = Z_FINISH;
		}
		break;
	    case ao_buffer: /* -buffer */
		if (i == objc-2) {
		    Tcl_SetObjResult(interp, Tcl_NewStringObj(
			    "\"-buffer\" option must be followed by integer"
			    " decompression buffersize", -1));
		    Tcl_SetErrorCode(interp, "TCL", "ZIP", "NOVAL", NULL);
		    return TCL_ERROR;
		}
		if (Tcl_GetIntFromObj(interp, objv[i+1],
			&buffersize) != TCL_OK) {
		    return TCL_ERROR;
		}
		if (buffersize < 1 || buffersize > 65536) {
		    Tcl_SetObjResult(interp, Tcl_NewStringObj(
			    "buffer size must be 32 to 65536", -1));
		    Tcl_SetErrorCode(interp, "TCL", "VALUE", "BUFFERSIZE",
			    NULL);
		    return TCL_ERROR;
		}
	    }

	    if (flush == -2) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj(
			"\"-flush\", \"-fullflush\" and \"-finalize\" options"
			" are mutually exclusive", -1));
		Tcl_SetErrorCode(interp, "TCL", "ZIP", "EXCLUSIVE", NULL);
		return TCL_ERROR;
	    }
	}
	if (flush == -1) {
	    flush = 0;
	}

	if (Tcl_ZlibStreamPut(zstream, objv[objc-1], flush) != TCL_OK) {
	    return TCL_ERROR;
	}
	TclNewObj(obj);
	code = Tcl_ZlibStreamGet(zstream, obj, buffersize);
	if (code == TCL_OK) {
	    Tcl_SetObjResult(interp, obj);
	} else {
	    TclDecrRefCount(obj);
	}
	return code;

    case zs_put:		/* $strm put ?$flushopt? $data */
	for (i=2; i<objc-1; i++) {
	    if (Tcl_GetIndexFromObj(interp, objv[i], add_options, "option", 0,
		    &index) != TCL_OK) {
		return TCL_ERROR;
	    }

	    switch ((enum addOptions) index) {
	    case ao_flush: /* -flush */
		if (flush > -1) {
		    flush = -2;
		} else {
		    flush = Z_SYNC_FLUSH;
		}
		break;
	    case ao_fullflush: /* -fullflush */
		if (flush > -1) {
		    flush = -2;
		} else {
		    flush = Z_FULL_FLUSH;
		}
		break;
	    case ao_finalize: /* -finalize */
		if (flush > -1) {
		    flush = -2;
		} else {
		    flush = Z_FINISH;
		}
		break;
	    case ao_buffer:
		Tcl_SetObjResult(interp, Tcl_NewStringObj(
			"\"-buffer\" option not supported here", -1));
		return TCL_ERROR;
	    }
	    if (flush == -2) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj(
			"\"-flush\", \"-fullflush\" and \"-finalize\" options"
			" are mutually exclusive", -1));
		Tcl_SetErrorCode(interp, "TCL", "ZIP", "EXCLUSIVE", NULL);
		return TCL_ERROR;
	    }
	}
	if (flush == -1) {
	    flush = 0;
	}
	return Tcl_ZlibStreamPut(zstream, objv[objc-1], flush);


    case zs_get:		/* $strm get ?count? */
	if (objc > 3) {
	    Tcl_WrongNumArgs(interp, 2, objv, "?count?");
	    return TCL_ERROR;
	}

................................................................................
	return TCL_OK;
    case zs_checksum:		/* $strm checksum */
	if (objc != 2) {
	    Tcl_WrongNumArgs(interp, 2, objv, NULL);
	    return TCL_ERROR;
	}
	Tcl_SetObjResult(interp, Tcl_NewWideIntObj((Tcl_WideInt)
		Tcl_ZlibStreamChecksum(zstream)));
	return TCL_OK;
    case zs_reset:		/* $strm reset */
	if (objc != 2) {
	    Tcl_WrongNumArgs(interp, 2, objv, NULL);
	    return TCL_ERROR;
	}
	return Tcl_ZlibStreamReset(zstream);
    }

    return TCL_OK;
}
















































































































































































































































 
/*
 *----------------------------------------------------------------------
 *	Set of functions to support channel stacking.
 *----------------------------------------------------------------------
 *
 * ZlibTransformClose --
................................................................................
	do {
	    cd->outStream.next_out = (Bytef *) cd->outBuffer;
	    cd->outStream.avail_out = (unsigned) cd->outAllocated;
	    e = deflate(&cd->outStream, Z_FINISH);
	    if (e != Z_OK && e != Z_STREAM_END) {
		/* TODO: is this the right way to do errors on close? */
		if (!TclInThreadExit()) {
		    ConvertError(interp, e);
		}
		result = TCL_ERROR;
		break;
	    }
	    if (cd->outStream.avail_out != (unsigned) cd->outAllocated) {
		if (Tcl_WriteRaw(cd->parent, cd->outBuffer,
			cd->outAllocated - cd->outStream.avail_out) < 0) {
		    /* TODO: is this the right way to do errors on close?
		     * Note: when close is called from FinalizeIOSubsystem
		     * then interp may be NULL */
		    if (!TclInThreadExit()) {
			if (interp) {
			    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
				    "error while finalizing file: %s",
				    Tcl_PosixError(interp)));
			}
		    }
		    result = TCL_ERROR;
		    break;
		}
	    }
	} while (e != Z_STREAM_END);
	e = deflateEnd(&cd->outStream);
................................................................................
	 * Length (cd->decompressed) == 0, toRead > 0 here.
	 *
	 * The zlib transform allows us to read at most one character from the
	 * underlying channel to properly identify Z_STREAM_END without
	 * reading over the border.
	 */

	readBytes = Tcl_ReadRaw(cd->parent, cd->inBuffer, 1);

	/*
	 * Three cases here:
	 *  1.	Got some data from the underlying channel (readBytes > 0) so
	 *	it should be fed through the decompression engine.
	 *  2.	Got an error (readBytes < 0) which we should report up except
	 *	for the case where we can convert it to a short read.
................................................................................
    int toWrite,
    int *errorCodePtr)
{
    ZlibChannelData *cd = instanceData;
    Tcl_DriverOutputProc *outProc =
	    Tcl_ChannelOutputProc(Tcl_GetChannelType(cd->parent));
    int e, produced;


    if (cd->mode == TCL_ZLIB_STREAM_INFLATE) {
	return outProc(Tcl_GetChannelInstanceData(cd->parent), buf, toWrite,
		errorCodePtr);
    }

    cd->outStream.next_in = (Bytef *) buf;
................................................................................
	    if (Tcl_WriteRaw(cd->parent, cd->outBuffer, produced) < 0) {
		*errorCodePtr = Tcl_GetErrno();
		return -1;
	    }
	}
    } while (e == Z_OK && produced > 0 && cd->outStream.avail_in > 0);

    if (e != Z_OK) {
	Tcl_SetChannelError(cd->parent,







		Tcl_NewStringObj(cd->outStream.msg, -1));

	*errorCodePtr = EINVAL;
	return -1;
    }

    return toWrite - cd->outStream.avail_in;
}
 
/*
 *----------------------------------------------------------------------
 *
 * ZlibTransformSetOption --
 *
................................................................................
    Tcl_Interp *interp,
    const char *optionName,
    const char *value)
{
    ZlibChannelData *cd = instanceData;
    Tcl_DriverSetOptionProc *setOptionProc =
	    Tcl_ChannelSetOptionProc(Tcl_GetChannelType(cd->parent));

    static const char *chanOptions = "flush";


    int haveFlushOpt = (cd->mode == TCL_ZLIB_STREAM_DEFLATE);































    if (haveFlushOpt && optionName && strcmp(optionName, "-flush") == 0) {
	int flushType;

	if (value[0] == 'f' && strcmp(value, "full") == 0) {
	    flushType = Z_FULL_FLUSH;
	} else if (value[0] == 's' && strcmp(value, "sync") == 0) {
	    flushType = Z_SYNC_FLUSH;
	} else {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "unknown -flush type \"%s\": must be full or sync",
		    value));
	    Tcl_SetErrorCode(interp, "TCL", "VALUE", "FLUSH", NULL);
	    return TCL_ERROR;
	}

	/*
	 * Try to actually do the flush now.
	 */

	cd->outStream.avail_in = 0;
	while (1) {
	    int e;

	    cd->outStream.next_out = (Bytef *) cd->outBuffer;
	    cd->outStream.avail_out = cd->outAllocated;

	    e = deflate(&cd->outStream, flushType);
	    if (e == Z_BUF_ERROR) {
		break;
	    } else if (e != Z_OK) {
		ConvertError(interp, e);
		return TCL_ERROR;
	    } else if (cd->outStream.avail_out == 0) {
		break;
	    }

	    if (Tcl_WriteRaw(cd->parent, cd->outBuffer,
		    cd->outStream.next_out - (Bytef *) cd->outBuffer) < 0) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"problem flushing channel: %s",
			Tcl_PosixError(interp)));
		return TCL_ERROR;
	    }
	}
	return TCL_OK;
    }















    if (setOptionProc == NULL) {

	return Tcl_BadChannelOption(interp, optionName, chanOptions);







    }

    /*
     * Pass all unknown options down, to deeper transforms and/or the base
     * channel.
     */

................................................................................
    Tcl_Interp *interp,
    const char *optionName,
    Tcl_DString *dsPtr)
{
    ZlibChannelData *cd = instanceData;
    Tcl_DriverGetOptionProc *getOptionProc =
	    Tcl_ChannelGetOptionProc(Tcl_GetChannelType(cd->parent));



    static const char *chanOptions = "checksum header";

    /*
     * The "crc" option reports the current CRC (calculated with the Adler32
     * or CRC32 algorithm according to the format) given the data that has
     * been processed so far.
     */

................................................................................
	    Tcl_DStringAppendElement(dsPtr, "-checksum");
	    Tcl_DStringAppendElement(dsPtr, buf);
	} else {
	    Tcl_DStringAppend(dsPtr, buf, -1);
	    return TCL_OK;
	}
    }























    /*
     * The "header" option, which is only valid on inflating gzip channels,
     * reports the header that has been read from the start of the stream.
     */

    if ((cd->flags & IN_HEADER) && ((optionName == NULL) ||
................................................................................
    if (getOptionProc) {
	return getOptionProc(Tcl_GetChannelInstanceData(cd->parent),
		interp, optionName, dsPtr);
    }
    if (optionName == NULL) {
	return TCL_OK;
    }

    return Tcl_BadChannelOption(interp, optionName, chanOptions);







}
 
/*
 *----------------------------------------------------------------------
 *
 * ZlibTransformWatch, ZlibTransformEventHandler --
 *
................................................................................
				 * readable. */
    int format,			/* One of the TCL_ZLIB_FORMAT_* values that
				 * indicates what compressed format to allow.
				 * TCL_ZLIB_FORMAT_AUTO is only supported for
				 * decompressing transforms. */
    int level,			/* What compression level to use. Ignored for
				 * decompressing transforms. */


    Tcl_Channel channel,	/* The channel to attach to. */
    Tcl_Obj *gzipHeaderDictPtr)	/* A description of header to use, or NULL to
				 * use a default. Ignored if not compressing
				 * to produce gzip-format data. */



{
    ZlibChannelData *cd = ckalloc(sizeof(ZlibChannelData));
    Tcl_Channel chan;
    int wbits = 0;
    int e;

    if (mode != TCL_ZLIB_STREAM_DEFLATE && mode != TCL_ZLIB_STREAM_INFLATE) {
	Tcl_Panic("unknown mode: %d", mode);
    }

    memset(cd, 0, sizeof(ZlibChannelData));
    cd->mode = mode;



    if (format == TCL_ZLIB_FORMAT_GZIP || format == TCL_ZLIB_FORMAT_AUTO) {
	if (mode == TCL_ZLIB_STREAM_DEFLATE) {
	    if (gzipHeaderDictPtr) {
		int dummy = 0;

		cd->flags |= OUT_HEADER;
		if (GenerateHeader(interp, gzipHeaderDictPtr, &cd->outHeader,
			&dummy) != TCL_OK) {
		    goto error;
		}
	    }
	} else {
	    cd->flags |= IN_HEADER;
	    cd->inHeader.header.name = (Bytef *)
		    &cd->inHeader.nativeFilenameBuf;
	    cd->inHeader.header.name_max = MAXPATHLEN - 1;
	    cd->inHeader.header.comment = (Bytef *)
		    &cd->inHeader.nativeCommentBuf;
	    cd->inHeader.header.comm_max = MAX_COMMENT_LEN - 1;
	}
    }







    if (format == TCL_ZLIB_FORMAT_RAW) {
	wbits = WBITS_RAW;
    } else if (format == TCL_ZLIB_FORMAT_ZLIB) {
	wbits = WBITS_ZLIB;
    } else if (format == TCL_ZLIB_FORMAT_GZIP) {
	wbits = WBITS_GZIP;
................................................................................
	cd->inBuffer = ckalloc(cd->inAllocated);
	if (cd->flags & IN_HEADER) {
	    e = inflateGetHeader(&cd->inStream, &cd->inHeader.header);
	    if (e != Z_OK) {
		goto error;
	    }
	}








    } else {
	e = deflateInit2(&cd->outStream, level, Z_DEFLATED, wbits,
		MAX_MEM_LEVEL, Z_DEFAULT_STRATEGY);
	if (e != Z_OK) {
	    goto error;
	}
	cd->outAllocated = DEFAULT_BUFFER_SIZE;
	cd->outBuffer = ckalloc(cd->outAllocated);
	if (cd->flags & OUT_HEADER) {
	    e = deflateSetHeader(&cd->outStream, &cd->outHeader.header);
	    if (e != Z_OK) {
		goto error;
	    }






	}
    }

    Tcl_DStringInit(&cd->decompressed);

    chan = Tcl_StackChannel(interp, &zlibChannelType, cd,
	    Tcl_GetChannelMode(channel), channel);
................................................................................
	ckfree(cd->inBuffer);
	inflateEnd(&cd->inStream);
    }
    if (cd->outBuffer) {
	ckfree(cd->outBuffer);
	deflateEnd(&cd->outStream);
    }



    ckfree(cd);
    return NULL;
}
 
/*
 *----------------------------------------------------------------------
 *
................................................................................
    int n,
    int flush,
    int *errorCodePtr)
{
#define MAXBUF	1024
    unsigned char buf[MAXBUF];
    int e, written;


    cd->inStream.next_in = (Bytef *) cd->inBuffer;
    cd->inStream.avail_in = n;

    while (1) {
	cd->inStream.next_out = (Bytef *) buf;
	cd->inStream.avail_out = MAXBUF;

	e = inflate(&cd->inStream, flush);













	/*
	 * avail_out is now the left over space in the output.  Therefore
	 * "MAXBUF - avail_out" is the amount of bytes generated.
	 */

	written = MAXBUF - cd->inStream.avail_out;
................................................................................
	 * Just indicates that the zlib couldn't consume input/produce output,
	 * and is fixed by supplying more input.
	 *
	 * Otherwise, we've got errors and need to report to higher-up.
	 */

	if ((e != Z_OK) && (e != Z_BUF_ERROR)) {
	    Tcl_Obj *errObj = Tcl_NewListObj(0, NULL);

	    Tcl_ListObjAppendElement(NULL, errObj,
		    Tcl_NewStringObj(cd->inStream.msg, -1));
	    Tcl_SetChannelError(cd->parent, errObj);
	    *errorCodePtr = EINVAL;
	    return TCL_ERROR;
	}

	/*
	 * Check if the inflate stopped early.
	 */

	if (cd->inStream.avail_in <= 0 && flush != Z_SYNC_FLUSH) {
	    return TCL_OK;
	}
    }











}
 
/*
 *----------------------------------------------------------------------
 *	Finally, the TclZlibInit function. Used to install the zlib API.
 *----------------------------------------------------------------------
 */

int
TclZlibInit(
    Tcl_Interp *interp)
{


    /*
     * This does two things. It creates a counter used in the creation of
     * stream commands, and it creates the namespace that will contain those
     * commands.
     */

    Tcl_Eval(interp, "namespace eval ::tcl::zlib {variable cmdcounter 0}");

    /*
     * Create the public scripted interface to this file's functionality.
     */

    Tcl_CreateObjCommand(interp, "zlib", ZlibCmd, 0, 0);

















    return Tcl_PkgProvide(interp, "zlib", TCL_ZLIB_VERSION);
}
 
/*
 *----------------------------------------------------------------------
 *	Stubs used when a suitable zlib installation was not found during
 *	configure.
................................................................................
Tcl_ZlibAdler32(
    unsigned int adler,
    const char *buf,
    int len)
{
    return 0;
}








#endif /* HAVE_ZLIB */
 
/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */






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1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
..
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
...
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
...
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
...
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262



263
264

265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
...
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
...
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
...
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
...
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
...
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
...
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
...
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
...
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
...
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
...
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
....
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
....
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
....
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
....
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
....
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
....
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
....
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
....
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
....
1893
1894
1895
1896
1897
1898
1899
1900
1901

1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913








1914
1915
1916
1917
1918
1919
1920
....
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
....
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
....
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013

2014
2015
2016
2017
2018
2019
2020
....
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
....
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
....
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
....
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214

2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254



2255
2256
2257
2258
2259
2260
2261
2262
2263
2264


2265
2266

2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302


2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
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/*
 * tclZlib.c --
 *
 *	This file provides the interface to the Zlib library.
 *
 * Copyright (C) 2004-2005 Pascal Scheffers <[email protected]>
 * Copyright (C) 2005 Unitas Software B.V.
 * Copyright (c) 2008-2012 Donal K. Fellows
 *
 * Parts written by Jean-Claude Wippler, as part of Tclkit, placed in the
 * public domain March 2003.
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */
................................................................................
    int format;			/* Flags from the TCL_ZLIB_FORMAT_* */
    int level;			/* Default 5, 0-9 */
    int flush;			/* Stores the flush param for deferred the
				 * decompression. */
    int wbits;			/* The encoded compression mode, so we can
				 * restart the stream if necessary. */
    Tcl_Command cmd;		/* Token for the associated Tcl command. */
    Tcl_Obj *compDictObj;	/* Byte-array object containing compression
				 * dictionary (not dictObj!) to use if
				 * necessary. */
    int flags;			/* Miscellaneous flag bits. */
    GzipHeader *gzHeaderPtr;	/* If we've allocated a gzip header
				 * structure. */
} ZlibStreamHandle;

#define DICT_TO_SET	0x1	/* If we need to set a compression dictionary
				 * in the low-level engine at the next
				 * opportunity. */

/*
 * Macros to make it clearer in some of the twiddlier accesses what is
 * happening.
 */

#define IsRawStream(zshPtr)	((zshPtr)->format == TCL_ZLIB_FORMAT_RAW)
#define HaveDictToSet(zshPtr)	((zshPtr)->flags & DICT_TO_SET)
#define DictWasSet(zshPtr)	((zshPtr)->flags |= ~DICT_TO_SET)

/*
 * Structure used for stacked channel compression and decompression.
 */

typedef struct {
    Tcl_Channel chan;		/* Reference to the channel itself. */
    Tcl_Channel parent;		/* The underlying source and sink of bytes. */
    int flags;			/* General flag bits, see below... */
    int mode;			/* Either the value TCL_ZLIB_STREAM_DEFLATE
				 * for compression on output, or
				 * TCL_ZLIB_STREAM_INFLATE for decompression
				 * on input. */
    int format;			/* What format of data is going on the wire.
				 * Needed so that the correct [fconfigure]
				 * options can be enabled. */
    int readAheadLimit;		/* The maximum number of bytes to read from
				 * the underlying stream in one go. */
    z_stream inStream;		/* Structure used by zlib for decompression of
				 * input. */
    z_stream outStream;		/* Structure used by zlib for compression of
				 * output. */
    char *inBuffer, *outBuffer;	/* Working buffers. */
    int inAllocated, outAllocated;
				/* Sizes of working buffers. */
    GzipHeader inHeader;	/* Header read from input stream, when
				 * decompressing a gzip stream. */
    GzipHeader outHeader;	/* Header to write to an output stream, when
				 * compressing a gzip stream. */
    Tcl_TimerToken timer;	/* Timer used for keeping events fresh. */
    Tcl_DString decompressed;	/* Buffer for decompression results. */
    Tcl_Obj *compDictObj;	/* Byte-array object containing compression
				 * dictionary (not dictObj!) to use if
				 * necessary. */
} ZlibChannelData;

/*
 * Value bits for the flags field. Definitions are:
 *	ASYNC -		Whether this is an asynchronous channel.
 *	IN_HEADER -	Whether the inHeader field has been registered with
 *			the input compressor.
................................................................................
 */

#define ASYNC			0x1
#define IN_HEADER		0x2
#define OUT_HEADER		0x4

/*
 * Size of buffers allocated by default, and the range it can be set to.  The
 * same sorts of values apply to streams, except with different limits (they
 * permit byte-level activity). Channels always use bytes unless told to use
 * larger buffers.
 */

#define DEFAULT_BUFFER_SIZE	4096
#define MIN_NONSTREAM_BUFFER_SIZE 16
#define MAX_BUFFER_SIZE		65536

/*
 * Prototypes for private procedures defined later in this file:
 */

static Tcl_CmdDeleteProc	ZlibStreamCmdDelete;
static Tcl_DriverBlockModeProc	ZlibTransformBlockMode;
................................................................................
static Tcl_DriverHandlerProc	ZlibTransformEventHandler;
static Tcl_DriverInputProc	ZlibTransformInput;
static Tcl_DriverOutputProc	ZlibTransformOutput;
static Tcl_DriverSetOptionProc	ZlibTransformSetOption;
static Tcl_DriverWatchProc	ZlibTransformWatch;
static Tcl_ObjCmdProc		ZlibCmd;
static Tcl_ObjCmdProc		ZlibStreamCmd;
static Tcl_ObjCmdProc		ZlibStreamAddCmd;
static Tcl_ObjCmdProc		ZlibStreamHeaderCmd;
static Tcl_ObjCmdProc		ZlibStreamPutCmd;

static void		ConvertError(Tcl_Interp *interp, int code,
			    uLong adler);
static Tcl_Obj *	ConvertErrorToList(int code, uLong adler);
static void		ExtractHeader(gz_header *headerPtr, Tcl_Obj *dictObj);
static int		GenerateHeader(Tcl_Interp *interp, Tcl_Obj *dictObj,
			    GzipHeader *headerPtr, int *extraSizePtr);
static int		ZlibPushSubcmd(Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static inline int	ResultCopy(ZlibChannelData *cd, char *buf,
			    int toRead);
static int		ResultGenerate(ZlibChannelData *cd, int n, int flush,
			    int *errorCodePtr);
static Tcl_Channel	ZlibStackChannelTransform(Tcl_Interp *interp,
			    int mode, int format, int level, int limit,
			    Tcl_Channel channel, Tcl_Obj *gzipHeaderDictPtr,
			    Tcl_Obj *compDictObj);
static void		ZlibStreamCleanup(ZlibStreamHandle *zshPtr);
static int		ZlibStreamSubcmd(Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static inline void	ZlibTransformEventTimerKill(ZlibChannelData *cd);
static void		ZlibTransformTimerRun(ClientData clientData);

/*
 * Type of zlib-based compressing and decompressing channels.
 */

................................................................................
 *----------------------------------------------------------------------
 */

static void
ConvertError(
    Tcl_Interp *interp,		/* Interpreter to store the error in. May be
				 * NULL, in which case nothing happens. */
    int code,			/* The zlib error code. */
    uLong adler)		/* The checksum expected (for Z_NEED_DICT) */
{
    const char *codeStr, *codeStr2 = NULL;
    char codeStrBuf[TCL_INTEGER_SPACE];

    if (interp == NULL) {
	return;
    }

    switch (code) {
	/*
	 * Firstly, the case that is *different* because it's really coming
	 * from the OS and is just being reported via zlib. It should be
	 * really uncommon because Tcl handles all I/O rather than delegating
	 * it to zlib, but proving it can't happen is hard.
	 */

    case Z_ERRNO:
	Tcl_SetObjResult(interp, Tcl_NewStringObj(Tcl_PosixError(interp),-1));



	return;


	/*
	 * Normal errors/conditions, some of which have additional detail and
	 * some which don't. (This is not defined by array lookup because zlib
	 * error codes are sometimes negative.)
	 */

    case Z_STREAM_ERROR:
	codeStr = "STREAM";
	break;
    case Z_DATA_ERROR:
	codeStr = "DATA";
	break;
    case Z_MEM_ERROR:
	codeStr = "MEM";
	break;
    case Z_BUF_ERROR:
	codeStr = "BUF";
	break;
    case Z_VERSION_ERROR:
	codeStr = "VERSION";
	break;
    case Z_NEED_DICT:
	codeStr = "NEED_DICT";
	codeStr2 = codeStrBuf;
	sprintf(codeStrBuf, "%lu", adler);
	break;

	/*
	 * These should _not_ happen! This function is for dealing with error
	 * cases, not non-errors!
	 */

    case Z_OK:
	Tcl_Panic("unexpected zlib result in error handler: Z_OK");
    case Z_STREAM_END:
	Tcl_Panic("unexpected zlib result in error handler: Z_STREAM_END");

	/*
	 * Anything else is bad news; it's unexpected. Convert to generic
	 * error.
	 */

    default:
	codeStr = "UNKNOWN";
	codeStr2 = codeStrBuf;
	sprintf(codeStrBuf, "%d", code);
	break;
    }
    Tcl_SetObjResult(interp, Tcl_NewStringObj(zError(code), -1));

    /*
     * Tricky point! We might pass NULL twice here (and will when the error
     * type is known).
     */

    Tcl_SetErrorCode(interp, "TCL", "ZLIB", codeStr, codeStr2, NULL);
}

static Tcl_Obj *
ConvertErrorToList(
    int code,			/* The zlib error code. */
    uLong adler)		/* The checksum expected (for Z_NEED_DICT) */
{
    Tcl_Obj *objv[4];

    TclNewLiteralStringObj(objv[0], "TCL");
    TclNewLiteralStringObj(objv[1], "ZLIB");
    switch (code) {
    case Z_STREAM_ERROR:
	TclNewLiteralStringObj(objv[2], "STREAM");
	return Tcl_NewListObj(3, objv);
    case Z_DATA_ERROR:
	TclNewLiteralStringObj(objv[2], "DATA");
	return Tcl_NewListObj(3, objv);
    case Z_MEM_ERROR:
	TclNewLiteralStringObj(objv[2], "MEM");
	return Tcl_NewListObj(3, objv);
    case Z_BUF_ERROR:
	TclNewLiteralStringObj(objv[2], "BUF");
	return Tcl_NewListObj(3, objv);
    case Z_VERSION_ERROR:
	TclNewLiteralStringObj(objv[2], "VERSION");
	return Tcl_NewListObj(3, objv);
    case Z_ERRNO:
	TclNewLiteralStringObj(objv[2], "POSIX");
	objv[3] = Tcl_NewStringObj(Tcl_ErrnoId(), -1);
	return Tcl_NewListObj(4, objv);
    case Z_NEED_DICT:
	TclNewLiteralStringObj(objv[2], "NEED_DICT");
	objv[3] = Tcl_NewWideIntObj((Tcl_WideInt) adler);
	return Tcl_NewListObj(4, objv);

	/*
	 * These should _not_ happen! This function is for dealing with error
	 * cases, not non-errors!
	 */

    case Z_OK:
	Tcl_Panic("unexpected zlib result in error handler: Z_OK");
    case Z_STREAM_END:
	Tcl_Panic("unexpected zlib result in error handler: Z_STREAM_END");

	/*
	 * Catch-all. Should be unreachable because all cases are already
	 * listed above.
	 */

    default:
	TclNewLiteralStringObj(objv[2], "UNKNOWN");
	TclNewIntObj(objv[3], code);
	return Tcl_NewListObj(4, objv);
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * GenerateHeader --
................................................................................
    } else if (value != NULL) {
	valueStr = Tcl_GetStringFromObj(value, &len);
	Tcl_UtfToExternal(NULL, latin1enc, valueStr, len, 0, NULL,
		headerPtr->nativeCommentBuf, MAX_COMMENT_LEN-1, NULL, &len,
		NULL);
	headerPtr->nativeCommentBuf[len] = '\0';
	headerPtr->header.comment = (Bytef *) headerPtr->nativeCommentBuf;
	if (extraSizePtr != NULL) {
	    *extraSizePtr += len;
	}
    }

    if (GetValue(interp, dictObj, "crc", &value) != TCL_OK) {
	goto error;
    } else if (value != NULL &&
	    Tcl_GetBooleanFromObj(interp, value, &headerPtr->header.hcrc)) {
	goto error;
................................................................................
	goto error;
    } else if (value != NULL) {
	valueStr = Tcl_GetStringFromObj(value, &len);
	Tcl_UtfToExternal(NULL, latin1enc, valueStr, len, 0, NULL,
		headerPtr->nativeFilenameBuf, MAXPATHLEN-1, NULL, &len, NULL);
	headerPtr->nativeFilenameBuf[len] = '\0';
	headerPtr->header.name = (Bytef *) headerPtr->nativeFilenameBuf;
	if (extraSizePtr != NULL) {
	    *extraSizePtr += len;
	}
    }

    if (GetValue(interp, dictObj, "os", &value) != TCL_OK) {
	goto error;
    } else if (value != NULL && Tcl_GetIntFromObj(interp, value,
	    &headerPtr->header.os) != TCL_OK) {
	goto error;
................................................................................
		Tcl_NewStringObj(headerPtr->text ? "text" : "binary", -1));
    }

    if (latin1enc != NULL) {
	Tcl_FreeEncoding(latin1enc);
    }
}
 
static int
SetInflateDictionary(
    z_streamp strm,
    Tcl_Obj *compDictObj)
{
    if (compDictObj != NULL) {
	int length;
	unsigned char *bytes = Tcl_GetByteArrayFromObj(compDictObj, &length);

	return inflateSetDictionary(strm, bytes, (unsigned) length);
    }
    return Z_OK;
}

static int
SetDeflateDictionary(
    z_streamp strm,
    Tcl_Obj *compDictObj)
{
    if (compDictObj != NULL) {
	int length;
	unsigned char *bytes = Tcl_GetByteArrayFromObj(compDictObj, &length);

	return deflateSetDictionary(strm, bytes, (unsigned) length);
    }
    return Z_OK;
}
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_ZlibStreamInit --
 *
 *	This command initializes a (de)compression context/handle for
................................................................................
    Tcl_ZlibStream *zshandlePtr)
{
    int wbits = 0;
    int e;
    ZlibStreamHandle *zshPtr = NULL;
    Tcl_DString cmdname;
    Tcl_CmdInfo cmdinfo;
    GzipHeader *gzHeaderPtr = NULL;

    switch (mode) {
    case TCL_ZLIB_STREAM_DEFLATE:
	/*
	 * Compressed format is specified by the wbits parameter. See zlib.h
	 * for details.
	 */
................................................................................

	switch (format) {
	case TCL_ZLIB_FORMAT_RAW:
	    wbits = WBITS_RAW;
	    break;
	case TCL_ZLIB_FORMAT_GZIP:
	    wbits = WBITS_GZIP;
	    if (dictObj) {
		gzHeaderPtr = ckalloc(sizeof(GzipHeader));
		memset(gzHeaderPtr, 0, sizeof(GzipHeader));
		if (GenerateHeader(interp, dictObj, gzHeaderPtr,
			NULL) != TCL_OK) {
		    ckfree(gzHeaderPtr);
		    return TCL_ERROR;
		}
	    }
	    break;
	case TCL_ZLIB_FORMAT_ZLIB:
	    wbits = WBITS_ZLIB;
	    break;
	default:
	    Tcl_Panic("incorrect zlib data format, must be "
		    "TCL_ZLIB_FORMAT_ZLIB, TCL_ZLIB_FORMAT_GZIP or "
................................................................................

	switch (format) {
	case TCL_ZLIB_FORMAT_RAW:
	    wbits = WBITS_RAW;
	    break;
	case TCL_ZLIB_FORMAT_GZIP:
	    wbits = WBITS_GZIP;
	    gzHeaderPtr = ckalloc(sizeof(GzipHeader));
	    memset(gzHeaderPtr, 0, sizeof(GzipHeader));
	    gzHeaderPtr->header.name = (Bytef *)
		    gzHeaderPtr->nativeFilenameBuf;
	    gzHeaderPtr->header.name_max = MAXPATHLEN - 1;
	    gzHeaderPtr->header.comment = (Bytef *)
		    gzHeaderPtr->nativeCommentBuf;
	    gzHeaderPtr->header.name_max = MAX_COMMENT_LEN - 1;
	    break;
	case TCL_ZLIB_FORMAT_ZLIB:
	    wbits = WBITS_ZLIB;
	    break;
	case TCL_ZLIB_FORMAT_AUTO:
	    wbits = WBITS_AUTODETECT;
	    break;
................................................................................
    zshPtr->interp = interp;
    zshPtr->mode = mode;
    zshPtr->format = format;
    zshPtr->level = level;
    zshPtr->wbits = wbits;
    zshPtr->currentInput = NULL;
    zshPtr->streamEnd = 0;
    zshPtr->compDictObj = NULL;
    zshPtr->flags = 0;
    zshPtr->gzHeaderPtr = gzHeaderPtr;
    memset(&zshPtr->stream, 0, sizeof(z_stream));
    zshPtr->stream.adler = 1;

    /*
     * No output buffer available yet
     */

    if (mode == TCL_ZLIB_STREAM_DEFLATE) {
	e = deflateInit2(&zshPtr->stream, level, Z_DEFLATED, wbits,
		MAX_MEM_LEVEL, Z_DEFAULT_STRATEGY);
	if (e == Z_OK && zshPtr->gzHeaderPtr) {
	    e = deflateSetHeader(&zshPtr->stream,
		    &zshPtr->gzHeaderPtr->header);
	}
    } else {
	e = inflateInit2(&zshPtr->stream, wbits);
	if (e == Z_OK && zshPtr->gzHeaderPtr) {
	    e = inflateGetHeader(&zshPtr->stream,
		    &zshPtr->gzHeaderPtr->header);
	}
    }

    if (e != Z_OK) {
	ConvertError(interp, e, zshPtr->stream.adler);
	goto error;
    }

    /*
     * I could do all this in C, but this is easier.
     */

................................................................................
     */

    if (zshandlePtr) {
	*zshandlePtr = (Tcl_ZlibStream) zshPtr;
    }

    return TCL_OK;

  error:
    if (zshPtr->compDictObj) {
	Tcl_DecrRefCount(zshPtr->compDictObj);
    }
    if (zshPtr->gzHeaderPtr) {
	ckfree(zshPtr->gzHeaderPtr);
    }
    ckfree(zshPtr);
    return TCL_ERROR;
}
 
/*
 *----------------------------------------------------------------------
 *
................................................................................
    }
    if (zshPtr->outData) {
	Tcl_DecrRefCount(zshPtr->outData);
    }
    if (zshPtr->currentInput) {
	Tcl_DecrRefCount(zshPtr->currentInput);
    }
    if (zshPtr->compDictObj) {
	Tcl_DecrRefCount(zshPtr->compDictObj);
    }
    if (zshPtr->gzHeaderPtr) {
	ckfree(zshPtr->gzHeaderPtr);
    }

    ckfree(zshPtr);
}
 
/*
 *----------------------------------------------------------------------
 *
................................................................................
    /*
     * No output buffer available yet.
     */

    if (zshPtr->mode == TCL_ZLIB_STREAM_DEFLATE) {
	e = deflateInit2(&zshPtr->stream, zshPtr->level, Z_DEFLATED,
		zshPtr->wbits, MAX_MEM_LEVEL, Z_DEFAULT_STRATEGY);
	if (e == Z_OK && HaveDictToSet(zshPtr)) {
	    e = SetDeflateDictionary(&zshPtr->stream, zshPtr->compDictObj);
	    if (e == Z_OK) {
		DictWasSet(zshPtr);
	    }
	}
    } else {
	e = inflateInit2(&zshPtr->stream, zshPtr->wbits);
	if (IsRawStream(zshPtr) && HaveDictToSet(zshPtr) && e == Z_OK) {
	    e = SetInflateDictionary(&zshPtr->stream, zshPtr->compDictObj);
	    if (e == Z_OK) {
		DictWasSet(zshPtr);
	    }
	}
    }

    if (e != Z_OK) {
	ConvertError(zshPtr->interp, e, zshPtr->stream.adler);
	/* TODO:cleanup */
	return TCL_ERROR;
    }

    return TCL_OK;
}
 
................................................................................

    return zshPtr->stream.adler;
}
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_ZlibStreamSetCompressionDictionary --
 *
 *	Sets the compression dictionary for a stream. This will be used as
 *	appropriate for the next compression or decompression action performed
 *	on the stream.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_ZlibStreamSetCompressionDictionary(
    Tcl_ZlibStream zshandle,
    Tcl_Obj *compressionDictionaryObj)
{
    ZlibStreamHandle *zshPtr = (ZlibStreamHandle *) zshandle;

    if (compressionDictionaryObj != NULL) {
	if (Tcl_IsShared(compressionDictionaryObj)) {
	    compressionDictionaryObj =
		    Tcl_DuplicateObj(compressionDictionaryObj);
	}
	Tcl_IncrRefCount(compressionDictionaryObj);
	zshPtr->flags |= DICT_TO_SET;
    } else {
	zshPtr->flags &= ~DICT_TO_SET;
    }
    if (zshPtr->compDictObj != NULL) {
	Tcl_DecrRefCount(zshPtr->compDictObj);
    }
    zshPtr->compDictObj = compressionDictionaryObj;
}
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_ZlibStreamPut --
 *
 *	Add data to the stream for compression or decompression from a
 *	bytearray Tcl_Obj.
 *
 *----------------------------------------------------------------------
 */
................................................................................
	}
	return TCL_ERROR;
    }

    if (zshPtr->mode == TCL_ZLIB_STREAM_DEFLATE) {
	zshPtr->stream.next_in = Tcl_GetByteArrayFromObj(data, &size);
	zshPtr->stream.avail_in = size;

	if (HaveDictToSet(zshPtr)) {
	    e = SetDeflateDictionary(&zshPtr->stream, zshPtr->compDictObj);
	    if (e != Z_OK) {
		if (zshPtr->interp) {
		    ConvertError(zshPtr->interp, e, zshPtr->stream.adler);
		}
		return TCL_ERROR;
	    }
	    DictWasSet(zshPtr);
	}

	/*
	 * Deflatebound doesn't seem to take various header sizes into
	 * account, so we add 100 extra bytes.
	 */

	outSize = deflateBound(&zshPtr->stream, zshPtr->stream.avail_in)+100;
................................................................................
		ckfree(dataTmp);
		dataTmp = ckalloc(outSize);
	    }
	    zshPtr->stream.avail_out = outSize;
	    zshPtr->stream.next_out = (Bytef *) dataTmp;

	    e = deflate(&zshPtr->stream, flush);
	}
	if (e != Z_OK && !(flush==Z_FINISH && e==Z_STREAM_END)) {
	    if (zshPtr->interp) {
		ConvertError(zshPtr->interp, e, zshPtr->stream.adler);
	    }
	    return TCL_ERROR;
	}

	/*
	 * And append the final data block.
	 */

	if (outSize - zshPtr->stream.avail_out > 0) {
................................................................................
    if (zshPtr->mode == TCL_ZLIB_STREAM_INFLATE) {
	if (count == -1) {
	    /*
	     * The only safe thing to do is restict to 65k. We might cause a
	     * panic for out of memory if we just kept growing the buffer.
	     */

	    count = MAX_BUFFER_SIZE;
	}

	/*
	 * Prepare the place to store the data.
	 */

	dataPtr = Tcl_SetByteArrayLength(data, existing+count);
................................................................................
		 * And remove it from the list
		 */

		Tcl_ListObjReplace(NULL, zshPtr->inData, 0, 1, 0, NULL);
	    }
	}

	/*
	 * When dealing with a raw stream, we set the dictionary here, once.
	 * (You can't do it in response to getting Z_NEED_DATA as raw streams
	 * don't ever issue that.)
	 */

	if (IsRawStream(zshPtr) && HaveDictToSet(zshPtr)) {
	    e = SetInflateDictionary(&zshPtr->stream, zshPtr->compDictObj);
	    if (e != Z_OK) {
		if (zshPtr->interp) {
		    ConvertError(zshPtr->interp, e, zshPtr->stream.adler);
		}
		return TCL_ERROR;
	    }
	    DictWasSet(zshPtr);
	}
	e = inflate(&zshPtr->stream, zshPtr->flush);
	if (e == Z_NEED_DICT && HaveDictToSet(zshPtr)) {
	    e = SetInflateDictionary(&zshPtr->stream, zshPtr->compDictObj);
	    if (e == Z_OK) {
		DictWasSet(zshPtr);
		e = inflate(&zshPtr->stream, zshPtr->flush);
	    }
	};
	Tcl_ListObjLength(NULL, zshPtr->inData, &listLen);

	while ((zshPtr->stream.avail_out > 0)
		&& (e == Z_OK || e == Z_BUF_ERROR) && (listLen > 0)) {
	    /*
	     * State: We have not satisfied the request yet and there may be
	     * more to inflate.
................................................................................
	    Tcl_ListObjReplace(NULL, zshPtr->inData, 0, 1, 0, NULL);
	    listLen--;

	    /*
	     * And call inflate again.
	     */

	    do {
		e = inflate(&zshPtr->stream, zshPtr->flush);
		if (e != Z_NEED_DICT || !HaveDictToSet(zshPtr)) {
		    break;
		}
		e = SetInflateDictionary(&zshPtr->stream,zshPtr->compDictObj);
		DictWasSet(zshPtr);
	    } while (e == Z_OK);
	}
	if (zshPtr->stream.avail_out > 0) {
	    Tcl_SetByteArrayLength(data,
		    existing + count - zshPtr->stream.avail_out);
	}
	if (!(e==Z_OK || e==Z_STREAM_END || e==Z_BUF_ERROR)) {
	    Tcl_SetByteArrayLength(data, existing);
	    ConvertError(zshPtr->interp, e, zshPtr->stream.adler);
	    return TCL_ERROR;
	}
	if (e == Z_STREAM_END) {
	    zshPtr->streamEnd = 1;
	    if (zshPtr->currentInput) {
		Tcl_DecrRefCount(zshPtr->currentInput);
		zshPtr->currentInput = 0;
................................................................................
     */

    Tcl_SetByteArrayLength(obj, stream.total_out);
    Tcl_SetObjResult(interp, obj);
    return TCL_OK;

  error:
    ConvertError(interp, e, stream.adler);
    TclDecrRefCount(obj);
    return TCL_ERROR;
}
 
/*
 *----------------------------------------------------------------------
 *
................................................................................
	ckfree(commentBuf);
    }
    Tcl_SetObjResult(interp, obj);
    return TCL_OK;

  error:
    TclDecrRefCount(obj);
    ConvertError(interp, e, stream.adler);
    if (nameBuf) {
	ckfree(nameBuf);
    }
    if (commentBuf) {
	ckfree(commentBuf);
    }
    return TCL_ERROR;
................................................................................
static int
ZlibCmd(
    ClientData notUsed,
    Tcl_Interp *interp,
    int objc,
    Tcl_Obj *const objv[])
{
    int command, dlen, i, option, level = -1;
    unsigned start, buffersize = 0;

    Byte *data;
    Tcl_Obj *headerDictObj;
    const char *extraInfoStr = NULL;
    static const char *const commands[] = {
	"adler32", "compress", "crc32", "decompress", "deflate", "gunzip",
	"gzip", "inflate", "push", "stream",
	NULL
    };
    enum zlibCommands {
	CMD_ADLER, CMD_COMPRESS, CMD_CRC, CMD_DECOMPRESS, CMD_DEFLATE,
	CMD_GUNZIP, CMD_GZIP, CMD_INFLATE, CMD_PUSH, CMD_STREAM
    };









    if (objc < 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "command arg ?...?");
	return TCL_ERROR;
    }
    if (Tcl_GetIndexFromObj(interp, objv[1], commands, "command", 0,
	    &command) != TCL_OK) {
................................................................................
	    return TCL_ERROR;
	}
	if (objc < 4) {
	    start = Tcl_ZlibAdler32(0, NULL, 0);
	}
	data = Tcl_GetByteArrayFromObj(objv[2], &dlen);
	Tcl_SetObjResult(interp, Tcl_NewWideIntObj((Tcl_WideInt)
		(uLong) Tcl_ZlibAdler32(start, data, dlen)));
	return TCL_OK;
    case CMD_CRC:			/* crc32 str ?startvalue?
					 * -> checksum */
	if (objc < 3 || objc > 4) {
	    Tcl_WrongNumArgs(interp, 2, objv, "data ?startValue?");
	    return TCL_ERROR;
	}
................................................................................
	    return TCL_ERROR;
	}
	if (objc < 4) {
	    start = Tcl_ZlibCRC32(0, NULL, 0);
	}
	data = Tcl_GetByteArrayFromObj(objv[2], &dlen);
	Tcl_SetObjResult(interp, Tcl_NewWideIntObj((Tcl_WideInt)
		(uLong) Tcl_ZlibCRC32(start, data, dlen)));
	return TCL_OK;
    case CMD_DEFLATE:			/* deflate data ?level?
					 * -> rawCompressedData */
	if (objc < 3 || objc > 4) {
	    Tcl_WrongNumArgs(interp, 2, objv, "data ?level?");
	    return TCL_ERROR;
	}
................................................................................
		goto badLevel;
	    }
	}
	return Tcl_ZlibDeflate(interp, TCL_ZLIB_FORMAT_ZLIB, objv[2], level,
		NULL);
    case CMD_GZIP:			/* gzip data ?level?
					 * -> gzippedCompressedData */
	headerDictObj = NULL;

	/*
	 * Legacy argument format support.
	 */

	if (objc == 4
		&& Tcl_GetIntFromObj(interp, objv[3], &level) == TCL_OK) {
	    if (level < 0 || level > 9) {
		extraInfoStr = "\n    (in -level option)";
		goto badLevel;
	    }
	    return Tcl_ZlibDeflate(interp, TCL_ZLIB_FORMAT_GZIP, objv[2],
		    level, NULL);
	}

	if (objc < 3 || objc > 7 || ((objc & 1) == 0)) {
	    Tcl_WrongNumArgs(interp, 2, objv,
		    "data ?-level level? ?-header header?");
	    return TCL_ERROR;
	}

	for (i=3 ; i<objc ; i+=2) {
	    static const char *const gzipopts[] = {
		"-header", "-level", NULL
	    };

	    if (Tcl_GetIndexFromObj(interp, objv[i], gzipopts, "option", 0,
		    &option) != TCL_OK) {
................................................................................
	    return TCL_ERROR;
	}
	if (objc > 3) {
	    if (Tcl_GetIntFromObj(interp, objv[3],
		    (int *) &buffersize) != TCL_OK) {
		return TCL_ERROR;
	    }
	    if (buffersize < MIN_NONSTREAM_BUFFER_SIZE
		    || buffersize > MAX_BUFFER_SIZE) {
		goto badBuffer;
	    }
	}
	return Tcl_ZlibInflate(interp, TCL_ZLIB_FORMAT_RAW, objv[2],
		buffersize, NULL);
    case CMD_DECOMPRESS:		/* decompress zlibcomprdata \
					 *    ?bufferSize?
................................................................................
	    return TCL_ERROR;
	}
	if (objc > 3) {
	    if (Tcl_GetIntFromObj(interp, objv[3],
		    (int *) &buffersize) != TCL_OK) {
		return TCL_ERROR;
	    }
	    if (buffersize < MIN_NONSTREAM_BUFFER_SIZE
		    || buffersize > MAX_BUFFER_SIZE) {
		goto badBuffer;
	    }
	}
	return Tcl_ZlibInflate(interp, TCL_ZLIB_FORMAT_ZLIB, objv[2],
		buffersize, NULL);
    case CMD_GUNZIP: {			/* gunzip gzippeddata ?bufferSize?
					 *	-> decompressedData */
	Tcl_Obj *headerVarObj;

	if (objc < 3 || objc > 5 || ((objc & 1) == 0)) {
	    Tcl_WrongNumArgs(interp, 2, objv, "data ?-headerVar varName?");
	    return TCL_ERROR;
	}
	headerDictObj = headerVarObj = NULL;
	for (i=3 ; i<objc ; i+=2) {
	    static const char *const gunzipopts[] = {
................................................................................
	    }
	    switch (option) {
	    case 0:
		if (Tcl_GetIntFromObj(interp, objv[i+1],
			(int *) &buffersize) != TCL_OK) {
		    return TCL_ERROR;
		}
		if (buffersize < MIN_NONSTREAM_BUFFER_SIZE
			|| buffersize > MAX_BUFFER_SIZE) {
		    goto badBuffer;
		}
		break;
	    case 1:
		headerVarObj = objv[i+1];
		headerDictObj = Tcl_NewObj();
		break;
................................................................................
		headerDictObj, TCL_LEAVE_ERR_MSG) == NULL) {
	    if (headerDictObj) {
		TclDecrRefCount(headerDictObj);
	    }
	    return TCL_ERROR;
	}
	return TCL_OK;
    }
    case CMD_STREAM:			/* stream deflate/inflate/...gunzip \
					 *    ?options...?
					 *	-> handleCmd */
	return ZlibStreamSubcmd(interp, objc, objv);
    case CMD_PUSH:			/* push mode channel options...
					 *	-> channel */
	return ZlibPushSubcmd(interp, objc, objv);
    };

    return TCL_ERROR;

  badLevel:
    Tcl_SetObjResult(interp, Tcl_NewStringObj("level must be 0 to 9", -1));
    Tcl_SetErrorCode(interp, "TCL", "VALUE", "COMPRESSIONLEVEL", NULL);
    if (extraInfoStr) {
	Tcl_AddErrorInfo(interp, extraInfoStr);
    }
    return TCL_ERROR;
  badBuffer:
    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
	    "buffer size must be %d to %d",
	    MIN_NONSTREAM_BUFFER_SIZE, MAX_BUFFER_SIZE));
    Tcl_SetErrorCode(interp, "TCL", "VALUE", "BUFFERSIZE", NULL);
    return TCL_ERROR;
}
 
/*
 *----------------------------------------------------------------------
 *
 * ZlibStreamSubcmd --
 *
 *	Implementation of the [zlib stream] subcommand.
 *
 *----------------------------------------------------------------------
 */

static int
ZlibStreamSubcmd(
    Tcl_Interp *interp,
    int objc,
    Tcl_Obj *const objv[])
{
    static const char *const stream_formats[] = {
	"compress", "decompress", "deflate", "gunzip", "gzip", "inflate",
	NULL
    };
    enum zlibFormats {
	FMT_COMPRESS, FMT_DECOMPRESS, FMT_DEFLATE, FMT_GUNZIP, FMT_GZIP,
	FMT_INFLATE
    };
    int i, format, mode = 0, option, level;
    typedef struct {
	const char *name;
	Tcl_Obj **valueVar;
    } OptDescriptor;
    Tcl_Obj *compDictObj = NULL;
    Tcl_Obj *gzipHeaderObj = NULL;
    Tcl_Obj *levelObj = NULL;
    const OptDescriptor compressionOpts[] = {
	{ "-dictionary", &compDictObj },
	{ "-level", &levelObj },
	{ NULL, NULL }
    };
    const OptDescriptor gzipOpts[] = {
	{ "-header", &gzipHeaderObj },
	{ "-level", &levelObj },
	{ NULL, NULL }
    };
    const OptDescriptor expansionOpts[] = {
	{ "-dictionary", &compDictObj },
	{ NULL, NULL }
    };
    const OptDescriptor gunzipOpts[] = {
	{ NULL, NULL }
    };
    const OptDescriptor *desc = NULL;
    Tcl_ZlibStream zh;

    if (objc < 3 || !(objc & 1)) {
	Tcl_WrongNumArgs(interp, 2, objv, "mode ?-option value...?");
	return TCL_ERROR;
    }
    if (Tcl_GetIndexFromObj(interp, objv[2], stream_formats, "mode", 0,
	    &format) != TCL_OK) {
	return TCL_ERROR;
    }


    /*
     * The format determines the compression mode and the options that may be
     * specified.
     */

    switch ((enum zlibFormats) format) {
    case FMT_DEFLATE:
	desc = compressionOpts;
	mode = TCL_ZLIB_STREAM_DEFLATE;
	format = TCL_ZLIB_FORMAT_RAW;
	break;
    case FMT_INFLATE:
	desc = expansionOpts;
	mode = TCL_ZLIB_STREAM_INFLATE;
	format = TCL_ZLIB_FORMAT_RAW;
	break;
    case FMT_COMPRESS:
	desc = compressionOpts;
	mode = TCL_ZLIB_STREAM_DEFLATE;
	format = TCL_ZLIB_FORMAT_ZLIB;
	break;
    case FMT_DECOMPRESS:
	desc = expansionOpts;
	mode = TCL_ZLIB_STREAM_INFLATE;
	format = TCL_ZLIB_FORMAT_ZLIB;
	break;
    case FMT_GZIP:
	desc = gzipOpts;
	mode = TCL_ZLIB_STREAM_DEFLATE;
	format = TCL_ZLIB_FORMAT_GZIP;
	break;
    case FMT_GUNZIP:
	desc = gunzipOpts;
	mode = TCL_ZLIB_STREAM_INFLATE;
	format = TCL_ZLIB_FORMAT_GZIP;
	break;
    default:
	Tcl_Panic("should be unreachable");
    }




    /*
     * Parse the options.
     */

    for (i=3 ; i<objc ; i+=2) {
	if (Tcl_GetIndexFromObjStruct(interp, objv[i], desc,
		sizeof(OptDescriptor), "option", 0, &option) != TCL_OK) {
	    return TCL_ERROR;
	}


	*desc[option].valueVar = objv[i+1];


	/*
	 * Drop the cache on the option name; table address not constant.
	 */

	TclFreeIntRep(objv[i]);
    }

    /*
     * If a compression level was given, parse it (integral: 0..9). Otherwise
     * use the default.
     */

    if (levelObj == NULL) {
	level = Z_DEFAULT_COMPRESSION;
    } else if (Tcl_GetIntFromObj(interp, levelObj, &level) != TCL_OK) {
	return TCL_ERROR;
    } else if (level < 0 || level > 9) {
	Tcl_SetObjResult(interp, Tcl_NewStringObj("level must be 0 to 9",-1));
	Tcl_SetErrorCode(interp, "TCL", "VALUE", "COMPRESSIONLEVEL", NULL);
	Tcl_AddErrorInfo(interp, "\n    (in -level option)");
	return TCL_ERROR;
    }

    /*
     * Construct the stream now we know its configuration.
     */

    if (Tcl_ZlibStreamInit(interp, mode, format, level, gzipHeaderObj,
	    &zh) != TCL_OK) {
	return TCL_ERROR;
    }
    if (compDictObj != NULL) {
	Tcl_ZlibStreamSetCompressionDictionary(zh, compDictObj);
    }
    Tcl_SetObjResult(interp, Tcl_ZlibStreamGetCommandName(zh));
    return TCL_OK;


}
 
/*
 *----------------------------------------------------------------------
 *
 * ZlibPushSubcmd --
 *
 *	Implementation of the [zlib push] subcommand.
 *
 *----------------------------------------------------------------------
 */

static int
ZlibPushSubcmd(
    Tcl_Interp *interp,
    int objc,
    Tcl_Obj *const objv[])
{
    static const char *const stream_formats[] = {
	"compress", "decompress", "deflate", "gunzip", "gzip", "inflate",
	NULL
    };
    enum zlibFormats {
	FMT_COMPRESS, FMT_DECOMPRESS, FMT_DEFLATE, FMT_GUNZIP, FMT_GZIP,
	FMT_INFLATE
    };
    Tcl_Channel chan;
    int chanMode, format, mode = 0, level, i, option;
    static const char *const pushCompressOptions[] = {
	"-dictionary", "-header", "-level", NULL
    };
    static const char *const pushDecompressOptions[] = {
	"-dictionary", "-header", "-level", "-limit", NULL

    };
    const char *const *pushOptions = pushDecompressOptions;
    enum pushOptions {poDictionary, poHeader, poLevel, poLimit};
    Tcl_Obj *headerObj = NULL, *compDictObj = NULL;
    int limit = 1, dummy;

    if (objc < 4) {
	Tcl_WrongNumArgs(interp, 2, objv, "mode channel ?options...?");
	return TCL_ERROR;
    }

    if (Tcl_GetIndexFromObj(interp, objv[2], stream_formats, "mode", 0,
	    &format) != TCL_OK) {
	return TCL_ERROR;
    }
    switch ((enum zlibFormats) format) {
    case FMT_DEFLATE:
	mode = TCL_ZLIB_STREAM_DEFLATE;
	format = TCL_ZLIB_FORMAT_RAW;
	pushOptions = pushCompressOptions;
	break;
    case FMT_INFLATE:
	mode = TCL_ZLIB_STREAM_INFLATE;
	format = TCL_ZLIB_FORMAT_RAW;
	break;
    case FMT_COMPRESS:
	mode = TCL_ZLIB_STREAM_DEFLATE;
	format = TCL_ZLIB_FORMAT_ZLIB;
	pushOptions = pushCompressOptions;
	break;
    case FMT_DECOMPRESS:
	mode = TCL_ZLIB_STREAM_INFLATE;
	format = TCL_ZLIB_FORMAT_ZLIB;
	break;
    case FMT_GZIP:
	mode = TCL_ZLIB_STREAM_DEFLATE;
	format = TCL_ZLIB_FORMAT_GZIP;
	pushOptions = pushCompressOptions;
	break;
    case FMT_GUNZIP:
	mode = TCL_ZLIB_STREAM_INFLATE;
	format = TCL_ZLIB_FORMAT_GZIP;
	break;
    default:


	Tcl_Panic("should be unreachable");
    }

    if (TclGetChannelFromObj(interp, objv[3], &chan, &chanMode, 0) != TCL_OK){

	return TCL_ERROR;
    }

    /*
     * Sanity checks.
     */

    if (mode == TCL_ZLIB_STREAM_DEFLATE && !(chanMode & TCL_WRITABLE)) {
	Tcl_SetObjResult(interp, Tcl_NewStringObj(
		"compression may only be applied to writable channels", -1));

	Tcl_SetErrorCode(interp, "TCL", "ZIP", "UNWRITABLE", NULL);
	return TCL_ERROR;
    }
    if (mode == TCL_ZLIB_STREAM_INFLATE && !(chanMode & TCL_READABLE)) {
	Tcl_SetObjResult(interp, Tcl_NewStringObj(
		"decompression may only be applied to readable channels",-1));

	Tcl_SetErrorCode(interp, "TCL", "ZIP", "UNREADABLE", NULL);
	return TCL_ERROR;
    }

    /*
     * Parse options.
     */

    level = Z_DEFAULT_COMPRESSION;
    for (i=4 ; i<objc ; i++) {
	if (Tcl_GetIndexFromObj(interp, objv[i], pushOptions, "option", 0,
		&option) != TCL_OK) {
	    return TCL_ERROR;
	}


	if (++i > objc-1) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "value missing for %s option", pushOptions[option]));
	    Tcl_SetErrorCode(interp, "TCL", "ZIP", "NOVAL", NULL);
	    return TCL_ERROR;
	}
	switch ((enum pushOptions) option) {
	case poHeader:
	    headerObj = objv[i];
	    if (Tcl_DictObjSize(interp, headerObj, &dummy) != TCL_OK) {


		goto genericOptionError;
	    }
	    break;
	case poLevel:

	    if (Tcl_GetIntFromObj(interp, objv[i], (int*) &level) != TCL_OK) {
		goto genericOptionError;
	    }
	    if (level < 0 || level > 9) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj(

			"level must be 0 to 9", -1));
		Tcl_SetErrorCode(interp, "TCL", "VALUE", "COMPRESSIONLEVEL",

			NULL);
		goto genericOptionError;
	    }
	    break;
	case poLimit:
	    if (Tcl_GetIntFromObj(interp, objv[i], (int*) &limit) != TCL_OK) {



		goto genericOptionError;
	    }



	    if (limit < 1 || limit > MAX_BUFFER_SIZE) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"read ahead limit must be 1 to %d",
			MAX_BUFFER_SIZE));
		Tcl_SetErrorCode(interp, "TCL", "VALUE", "BUFFERSIZE", NULL);
		goto genericOptionError;
	    }
	    break;
	case poDictionary:

	    if (format == TCL_ZLIB_FORMAT_GZIP) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj(

			"a compression dictionary may not be set in the "
			"gzip format", -1));
		Tcl_SetErrorCode(interp, "TCL", "ZIP", "BADOPT", NULL);

		goto genericOptionError;
	    }








	    compDictObj = objv[i];
	    break;
	}
    }

    if (ZlibStackChannelTransform(interp, mode, format, level, limit, chan,
	    headerObj, compDictObj) == NULL) {
	return TCL_ERROR;
    }
    Tcl_SetObjResult(interp, objv[3]);
    return TCL_OK;









  genericOptionError:
    Tcl_AddErrorInfo(interp, "\n    (in ");
    Tcl_AddErrorInfo(interp, pushOptions[option]);
    Tcl_AddErrorInfo(interp, " option)");

    return TCL_ERROR;





}
 
/*
 *----------------------------------------------------------------------
 *
 * ZlibStreamCmd --
 *
 *	Implementation of the commands returned by [zlib stream].
................................................................................
ZlibStreamCmd(
    ClientData cd,
    Tcl_Interp *interp,
    int objc,
    Tcl_Obj *const objv[])
{
    Tcl_ZlibStream zstream = cd;
    int command, count, code;
    Tcl_Obj *obj;
    static const char *const cmds[] = {
	"add", "checksum", "close", "eof", "finalize", "flush",
	"fullflush", "get", "header", "put", "reset",
	NULL
    };
    enum zlibStreamCommands {
	zs_add, zs_checksum, zs_close, zs_eof, zs_finalize, zs_flush,
	zs_fullflush, zs_get, zs_header, zs_put, zs_reset






    };

    if (objc < 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "option data ?...?");
	return TCL_ERROR;
    }

................................................................................
    if (Tcl_GetIndexFromObj(interp, objv[1], cmds, "option", 0,
	    &command) != TCL_OK) {
	return TCL_ERROR;
    }

    switch ((enum zlibStreamCommands) command) {
    case zs_add:		/* $strm add ?$flushopt? $data */
	return ZlibStreamAddCmd(zstream, interp, objc, objv);
    case zs_header:		/* $strm header */
	return ZlibStreamHeaderCmd(zstream, interp, objc, objv);






































































    case zs_put:		/* $strm put ?$flushopt? $data */













































	return ZlibStreamPutCmd(zstream, interp, objc, objv);

    case zs_get:		/* $strm get ?count? */
	if (objc > 3) {
	    Tcl_WrongNumArgs(interp, 2, objv, "?count?");
	    return TCL_ERROR;
	}

................................................................................
	return TCL_OK;
    case zs_checksum:		/* $strm checksum */
	if (objc != 2) {
	    Tcl_WrongNumArgs(interp, 2, objv, NULL);
	    return TCL_ERROR;
	}
	Tcl_SetObjResult(interp, Tcl_NewWideIntObj((Tcl_WideInt)
		(uLong) Tcl_ZlibStreamChecksum(zstream)));
	return TCL_OK;
    case zs_reset:		/* $strm reset */
	if (objc != 2) {
	    Tcl_WrongNumArgs(interp, 2, objv, NULL);
	    return TCL_ERROR;
	}
	return Tcl_ZlibStreamReset(zstream);
    }

    return TCL_OK;
}

static int
ZlibStreamAddCmd(
    ClientData cd,
    Tcl_Interp *interp,
    int objc,
    Tcl_Obj *const objv[])
{
    Tcl_ZlibStream zstream = cd;
    int index, code, buffersize = -1, flush = -1, i;
    Tcl_Obj *obj, *compDictObj = NULL;
    static const char *const add_options[] = {
	"-buffer", "-dictionary", "-finalize", "-flush", "-fullflush", NULL
    };
    enum addOptions {
	ao_buffer, ao_dictionary, ao_finalize, ao_flush, ao_fullflush
    };

    for (i=2; i<objc-1; i++) {
	if (Tcl_GetIndexFromObj(interp, objv[i], add_options, "option", 0,
		&index) != TCL_OK) {
	    return TCL_ERROR;
	}

	switch ((enum addOptions) index) {
	case ao_flush: /* -flush */
	    if (flush > -1) {
		flush = -2;
	    } else {
		flush = Z_SYNC_FLUSH;
	    }
	    break;
	case ao_fullflush: /* -fullflush */
	    if (flush > -1) {
		flush = -2;
	    } else {
		flush = Z_FULL_FLUSH;
	    }
	    break;
	case ao_finalize: /* -finalize */
	    if (flush > -1) {
		flush = -2;
	    } else {
		flush = Z_FINISH;
	    }
	    break;
	case ao_buffer: /* -buffer */
	    if (i == objc-2) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj(
			"\"-buffer\" option must be followed by integer "
			"decompression buffersize", -1));
		Tcl_SetErrorCode(interp, "TCL", "ZIP", "NOVAL", NULL);
		return TCL_ERROR;
	    }
	    if (Tcl_GetIntFromObj(interp, objv[++i], &buffersize) != TCL_OK) {
		return TCL_ERROR;
	    }
	    if (buffersize < 1 || buffersize > MAX_BUFFER_SIZE) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"buffer size must be 1 to %d",
			MAX_BUFFER_SIZE));
		Tcl_SetErrorCode(interp, "TCL", "VALUE", "BUFFERSIZE", NULL);
		return TCL_ERROR;
	    }
	    break;
	case ao_dictionary:
	    if (i == objc-2) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj(
			"\"-dictionary\" option must be followed by"
			" compression dictionary bytes", -1));
		Tcl_SetErrorCode(interp, "TCL", "ZIP", "NOVAL", NULL);
		return TCL_ERROR;
	    }
	    compDictObj = objv[++i];
	    break;
	}

	if (flush == -2) {
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
		    "\"-flush\", \"-fullflush\" and \"-finalize\" options"
		    " are mutually exclusive", -1));
	    Tcl_SetErrorCode(interp, "TCL", "ZIP", "EXCLUSIVE", NULL);
	    return TCL_ERROR;
	}
    }
    if (flush == -1) {
	flush = 0;
    }

    /*
     * Set the compression dictionary if requested.
     */

    if (compDictObj != NULL) {
	int len;

	(void) Tcl_GetByteArrayFromObj(compDictObj, &len);
	if (len == 0) {
	    compDictObj = NULL;
	}
	Tcl_ZlibStreamSetCompressionDictionary(zstream, compDictObj);
    }

    /*
     * Send the data to the stream core, along with any flushing directive.
     */

    if (Tcl_ZlibStreamPut(zstream, objv[objc-1], flush) != TCL_OK) {
	return TCL_ERROR;
    }

    /*
     * Get such data out as we can (up to the requested length).
     */

    TclNewObj(obj);
    code = Tcl_ZlibStreamGet(zstream, obj, buffersize);
    if (code == TCL_OK) {
	Tcl_SetObjResult(interp, obj);
    } else {
	TclDecrRefCount(obj);
    }
    return code;
}

static int
ZlibStreamPutCmd(
    ClientData cd,
    Tcl_Interp *interp,
    int objc,
    Tcl_Obj *const objv[])
{
    Tcl_ZlibStream zstream = cd;
    int index, flush = -1, i;
    Tcl_Obj *compDictObj = NULL;
    static const char *const put_options[] = {
	"-dictionary", "-finalize", "-flush", "-fullflush", NULL
    };
    enum putOptions {
	po_dictionary, po_finalize, po_flush, po_fullflush
    };

    for (i=2; i<objc-1; i++) {
	if (Tcl_GetIndexFromObj(interp, objv[i], put_options, "option", 0,
		&index) != TCL_OK) {
	    return TCL_ERROR;
	}

	switch ((enum putOptions) index) {
	case po_flush: /* -flush */
	    if (flush > -1) {
		flush = -2;
	    } else {
		flush = Z_SYNC_FLUSH;
	    }
	    break;
	case po_fullflush: /* -fullflush */
	    if (flush > -1) {
		flush = -2;
	    } else {
		flush = Z_FULL_FLUSH;
	    }
	    break;
	case po_finalize: /* -finalize */
	    if (flush > -1) {
		flush = -2;
	    } else {
		flush = Z_FINISH;
	    }
	    break;
	case po_dictionary:
	    if (i == objc-2) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj(
			"\"-dictionary\" option must be followed by"
			" compression dictionary bytes", -1));
		Tcl_SetErrorCode(interp, "TCL", "ZIP", "NOVAL", NULL);
		return TCL_ERROR;
	    }
	    compDictObj = objv[++i];
	    break;
	}
	if (flush == -2) {
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
		    "\"-flush\", \"-fullflush\" and \"-finalize\" options"
		    " are mutually exclusive", -1));
	    Tcl_SetErrorCode(interp, "TCL", "ZIP", "EXCLUSIVE", NULL);
	    return TCL_ERROR;
	}
    }
    if (flush == -1) {
	flush = 0;
    }

    /*
     * Set the compression dictionary if requested.
     */

    if (compDictObj != NULL) {
	int len;

	(void) Tcl_GetByteArrayFromObj(compDictObj, &len);
	if (len == 0) {
	    compDictObj = NULL;
	}
	Tcl_ZlibStreamSetCompressionDictionary(zstream, compDictObj);
    }

    /*
     * Send the data to the stream core, along with any flushing directive.
     */

    return Tcl_ZlibStreamPut(zstream, objv[objc-1], flush);
}

static int
ZlibStreamHeaderCmd(
    ClientData cd,
    Tcl_Interp *interp,
    int objc,
    Tcl_Obj *const objv[])
{
    ZlibStreamHandle *zshPtr = cd;
    Tcl_Obj *resultObj;

    if (objc != 2) {
	Tcl_WrongNumArgs(interp, 2, objv, NULL);
	return TCL_ERROR;
    } else if (zshPtr->mode != TCL_ZLIB_STREAM_INFLATE
	    || zshPtr->format != TCL_ZLIB_FORMAT_GZIP) {
	Tcl_SetObjResult(interp, Tcl_NewStringObj(
		"only gunzip streams can produce header information", -1));
	Tcl_SetErrorCode(interp, "TCL", "ZIP", "BADOP", NULL);
	return TCL_ERROR;
    }

    TclNewObj(resultObj);
    ExtractHeader(&zshPtr->gzHeaderPtr->header, resultObj);
    Tcl_SetObjResult(interp, resultObj);
    return TCL_OK;
}
 
/*
 *----------------------------------------------------------------------
 *	Set of functions to support channel stacking.
 *----------------------------------------------------------------------
 *
 * ZlibTransformClose --
................................................................................
	do {
	    cd->outStream.next_out = (Bytef *) cd->outBuffer;
	    cd->outStream.avail_out = (unsigned) cd->outAllocated;
	    e = deflate(&cd->outStream, Z_FINISH);
	    if (e != Z_OK && e != Z_STREAM_END) {
		/* TODO: is this the right way to do errors on close? */
		if (!TclInThreadExit()) {
		    ConvertError(interp, e, cd->outStream.adler);
		}
		result = TCL_ERROR;
		break;
	    }
	    if (cd->outStream.avail_out != (unsigned) cd->outAllocated) {
		if (Tcl_WriteRaw(cd->parent, cd->outBuffer,
			cd->outAllocated - cd->outStream.avail_out) < 0) {
		    /* TODO: is this the right way to do errors on close?
		     * Note: when close is called from FinalizeIOSubsystem
		     * then interp may be NULL */
		    if (!TclInThreadExit() && interp) {

			Tcl_SetObjResult(interp, Tcl_ObjPrintf(
				"error while finalizing file: %s",
				Tcl_PosixError(interp)));

		    }
		    result = TCL_ERROR;
		    break;
		}
	    }
	} while (e != Z_STREAM_END);
	e = deflateEnd(&cd->outStream);
................................................................................
	 * Length (cd->decompressed) == 0, toRead > 0 here.
	 *
	 * The zlib transform allows us to read at most one character from the
	 * underlying channel to properly identify Z_STREAM_END without
	 * reading over the border.
	 */

	readBytes = Tcl_ReadRaw(cd->parent, cd->inBuffer, cd->readAheadLimit);

	/*
	 * Three cases here:
	 *  1.	Got some data from the underlying channel (readBytes > 0) so
	 *	it should be fed through the decompression engine.
	 *  2.	Got an error (readBytes < 0) which we should report up except
	 *	for the case where we can convert it to a short read.
................................................................................
    int toWrite,
    int *errorCodePtr)
{
    ZlibChannelData *cd = instanceData;
    Tcl_DriverOutputProc *outProc =
	    Tcl_ChannelOutputProc(Tcl_GetChannelType(cd->parent));
    int e, produced;
    Tcl_Obj *errObj;

    if (cd->mode == TCL_ZLIB_STREAM_INFLATE) {
	return outProc(Tcl_GetChannelInstanceData(cd->parent), buf, toWrite,
		errorCodePtr);
    }

    cd->outStream.next_in = (Bytef *) buf;
................................................................................
	    if (Tcl_WriteRaw(cd->parent, cd->outBuffer, produced) < 0) {
		*errorCodePtr = Tcl_GetErrno();
		return -1;
	    }
	}
    } while (e == Z_OK && produced > 0 && cd->outStream.avail_in > 0);

    if (e == Z_OK) {
	return toWrite - cd->outStream.avail_in;
    }

    errObj = Tcl_NewListObj(0, NULL);
    Tcl_ListObjAppendElement(NULL, errObj, Tcl_NewStringObj("-errorcode",-1));
    Tcl_ListObjAppendElement(NULL, errObj,
	    ConvertErrorToList(e, cd->outStream.adler));
    Tcl_ListObjAppendElement(NULL, errObj,
	    Tcl_NewStringObj(cd->outStream.msg, -1));
    Tcl_SetChannelError(cd->parent, errObj);
    *errorCodePtr = EINVAL;
    return -1;



}
 
/*
 *----------------------------------------------------------------------
 *
 * ZlibTransformSetOption --
 *
................................................................................
    Tcl_Interp *interp,
    const char *optionName,
    const char *value)
{
    ZlibChannelData *cd = instanceData;
    Tcl_DriverSetOptionProc *setOptionProc =
	    Tcl_ChannelSetOptionProc(Tcl_GetChannelType(cd->parent));
    static const char *compressChanOptions = "dictionary flush";
    static const char *gzipChanOptions = "flush";
    static const char *decompressChanOptions = "dictionary limit";
    static const char *gunzipChanOptions = "flush limit";
    int haveFlushOpt = (cd->mode == TCL_ZLIB_STREAM_DEFLATE);

    if (optionName && (strcmp(optionName, "-dictionary") == 0)
	    && (cd->format != TCL_ZLIB_FORMAT_GZIP)) {
	Tcl_Obj *compDictObj;
	int code;

	TclNewStringObj(compDictObj, value, strlen(value));
	Tcl_IncrRefCount(compDictObj);
	(void) Tcl_GetByteArrayFromObj(compDictObj, NULL);
	if (cd->compDictObj) {
	    TclDecrRefCount(cd->compDictObj);
	}
	cd->compDictObj = compDictObj;
	code = Z_OK;
	if (cd->mode == TCL_ZLIB_STREAM_DEFLATE) {
	    code = SetDeflateDictionary(&cd->outStream, compDictObj);
	    if (code != Z_OK) {
		ConvertError(interp, code, cd->outStream.adler);
		return TCL_ERROR;
	    }
	} else if (cd->format == TCL_ZLIB_FORMAT_RAW) {
	    code = SetInflateDictionary(&cd->inStream, compDictObj);
	    if (code != Z_OK) {
		ConvertError(interp, code, cd->inStream.adler);
		return TCL_ERROR;
	    }
	}
	return TCL_OK;
    }

    if (haveFlushOpt) {
	if (optionName && strcmp(optionName, "-flush") == 0) {
	    int flushType;

	    if (value[0] == 'f' && strcmp(value, "full") == 0) {
		flushType = Z_FULL_FLUSH;
	    } else if (value[0] == 's' && strcmp(value, "sync") == 0) {
		flushType = Z_SYNC_FLUSH;
	    } else {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"unknown -flush type \"%s\": must be full or sync",
			value));
		Tcl_SetErrorCode(interp, "TCL", "VALUE", "FLUSH", NULL);
		return TCL_ERROR;
	    }

	    /*
	     * Try to actually do the flush now.
	     */

	    cd->outStream.avail_in = 0;
	    while (1) {
		int e;

		cd->outStream.next_out = (Bytef *) cd->outBuffer;
		cd->outStream.avail_out = cd->outAllocated;

		e = deflate(&cd->outStream, flushType);
		if (e == Z_BUF_ERROR) {
		    break;
		} else if (e != Z_OK) {
		    ConvertError(interp, e, cd->outStream.adler);
		    return TCL_ERROR;
		} else if (cd->outStream.avail_out == 0) {
		    break;
		}

		if (Tcl_WriteRaw(cd->parent, cd->outBuffer,
			cd->outStream.next_out - (Bytef *) cd->outBuffer)<0) {
		    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			    "problem flushing channel: %s",
			    Tcl_PosixError(interp)));
		    return TCL_ERROR;
		}
	    }
	    return TCL_OK;
	}
    } else {
	if (optionName && strcmp(optionName, "-limit") == 0) {
	    int newLimit;

	    if (Tcl_GetInt(interp, value, &newLimit) != TCL_OK) {
		return TCL_ERROR;
	    } else if (newLimit < 1 || newLimit > MAX_BUFFER_SIZE) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj(
			"-limit must be between 1 and 65536", -1));
		Tcl_SetErrorCode(interp, "TCL", "VALUE", "READLIMIT", NULL);
		return TCL_ERROR;
	    }
	}
    }

    if (setOptionProc == NULL) {
	if (cd->format == TCL_ZLIB_FORMAT_GZIP) {
	    return Tcl_BadChannelOption(interp, optionName,
		    (cd->mode == TCL_ZLIB_STREAM_DEFLATE)
		    ? gzipChanOptions : gunzipChanOptions);
	} else {
	    return Tcl_BadChannelOption(interp, optionName,
		    (cd->mode == TCL_ZLIB_STREAM_DEFLATE)
		    ? compressChanOptions : decompressChanOptions);
	}
    }

    /*
     * Pass all unknown options down, to deeper transforms and/or the base
     * channel.
     */

................................................................................
    Tcl_Interp *interp,
    const char *optionName,
    Tcl_DString *dsPtr)
{
    ZlibChannelData *cd = instanceData;
    Tcl_DriverGetOptionProc *getOptionProc =
	    Tcl_ChannelGetOptionProc(Tcl_GetChannelType(cd->parent));
    static const char *compressChanOptions = "checksum dictionary";
    static const char *gzipChanOptions = "checksum";
    static const char *decompressChanOptions = "checksum dictionary limit";
    static const char *gunzipChanOptions = "checksum header limit";

    /*
     * The "crc" option reports the current CRC (calculated with the Adler32
     * or CRC32 algorithm according to the format) given the data that has
     * been processed so far.
     */

................................................................................
	    Tcl_DStringAppendElement(dsPtr, "-checksum");
	    Tcl_DStringAppendElement(dsPtr, buf);
	} else {
	    Tcl_DStringAppend(dsPtr, buf, -1);
	    return TCL_OK;
	}
    }

    if ((cd->format != TCL_ZLIB_FORMAT_GZIP) &&
	    (optionName == NULL || strcmp(optionName, "-dictionary") == 0)) {
	/*
	 * Embedded NUL bytes are ok; they'll be C080-encoded.
	 */

	if (optionName == NULL) {
	    Tcl_DStringAppendElement(dsPtr, "-dictionary");
	    if (cd->compDictObj) {
		Tcl_DStringAppendElement(dsPtr,
			Tcl_GetString(cd->compDictObj));
	    } else {
		Tcl_DStringAppendElement(dsPtr, "");
	    }
	} else {
	    int len;
	    const char *str = Tcl_GetStringFromObj(cd->compDictObj, &len);

	    Tcl_DStringAppend(dsPtr, str, len);
	}
    }

    /*
     * The "header" option, which is only valid on inflating gzip channels,
     * reports the header that has been read from the start of the stream.
     */

    if ((cd->flags & IN_HEADER) && ((optionName == NULL) ||
................................................................................
    if (getOptionProc) {
	return getOptionProc(Tcl_GetChannelInstanceData(cd->parent),
		interp, optionName, dsPtr);
    }
    if (optionName == NULL) {
	return TCL_OK;
    }
    if (cd->format == TCL_ZLIB_FORMAT_GZIP) {
	return Tcl_BadChannelOption(interp, optionName,
		(cd->mode == TCL_ZLIB_STREAM_DEFLATE)
		? gzipChanOptions : gunzipChanOptions);
    } else {
	return Tcl_BadChannelOption(interp, optionName,
		(cd->mode == TCL_ZLIB_STREAM_DEFLATE)
		? compressChanOptions : decompressChanOptions);
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * ZlibTransformWatch, ZlibTransformEventHandler --
 *
................................................................................
				 * readable. */
    int format,			/* One of the TCL_ZLIB_FORMAT_* values that
				 * indicates what compressed format to allow.
				 * TCL_ZLIB_FORMAT_AUTO is only supported for
				 * decompressing transforms. */
    int level,			/* What compression level to use. Ignored for
				 * decompressing transforms. */
    int limit,			/* The limit on the number of bytes to read
				 * ahead; always at least 1. */
    Tcl_Channel channel,	/* The channel to attach to. */
    Tcl_Obj *gzipHeaderDictPtr,	/* A description of header to use, or NULL to
				 * use a default. Ignored if not compressing
				 * to produce gzip-format data. */
    Tcl_Obj *compDictObj)	/* Byte-array object containing compression
				 * dictionary (not dictObj!) to use if
				 * necessary. */
{
    ZlibChannelData *cd = ckalloc(sizeof(ZlibChannelData));
    Tcl_Channel chan;
    int wbits = 0;
    int e;

    if (mode != TCL_ZLIB_STREAM_DEFLATE && mode != TCL_ZLIB_STREAM_INFLATE) {
	Tcl_Panic("unknown mode: %d", mode);
    }

    memset(cd, 0, sizeof(ZlibChannelData));
    cd->mode = mode;
    cd->format = format;
    cd->readAheadLimit = limit;

    if (format == TCL_ZLIB_FORMAT_GZIP || format == TCL_ZLIB_FORMAT_AUTO) {
	if (mode == TCL_ZLIB_STREAM_DEFLATE) {
	    if (gzipHeaderDictPtr) {


		cd->flags |= OUT_HEADER;
		if (GenerateHeader(interp, gzipHeaderDictPtr, &cd->outHeader,
			NULL) != TCL_OK) {
		    goto error;
		}
	    }
	} else {
	    cd->flags |= IN_HEADER;
	    cd->inHeader.header.name = (Bytef *)
		    &cd->inHeader.nativeFilenameBuf;
	    cd->inHeader.header.name_max = MAXPATHLEN - 1;
	    cd->inHeader.header.comment = (Bytef *)
		    &cd->inHeader.nativeCommentBuf;
	    cd->inHeader.header.comm_max = MAX_COMMENT_LEN - 1;
	}
    }

    if (compDictObj != NULL) {
	cd->compDictObj = Tcl_DuplicateObj(compDictObj);
	Tcl_IncrRefCount(cd->compDictObj);
	Tcl_GetByteArrayFromObj(cd->compDictObj, NULL);
    }

    if (format == TCL_ZLIB_FORMAT_RAW) {
	wbits = WBITS_RAW;
    } else if (format == TCL_ZLIB_FORMAT_ZLIB) {
	wbits = WBITS_ZLIB;
    } else if (format == TCL_ZLIB_FORMAT_GZIP) {
	wbits = WBITS_GZIP;
................................................................................
	cd->inBuffer = ckalloc(cd->inAllocated);
	if (cd->flags & IN_HEADER) {
	    e = inflateGetHeader(&cd->inStream, &cd->inHeader.header);
	    if (e != Z_OK) {
		goto error;
	    }
	}
	if (cd->format == TCL_ZLIB_FORMAT_RAW && cd->compDictObj) {
	    e = SetInflateDictionary(&cd->inStream, cd->compDictObj);
	    if (e != Z_OK) {
		goto error;
	    }
	    TclDecrRefCount(cd->compDictObj);
	    cd->compDictObj = NULL;
	}
    } else {
	e = deflateInit2(&cd->outStream, level, Z_DEFLATED, wbits,
		MAX_MEM_LEVEL, Z_DEFAULT_STRATEGY);
	if (e != Z_OK) {
	    goto error;
	}
	cd->outAllocated = DEFAULT_BUFFER_SIZE;
	cd->outBuffer = ckalloc(cd->outAllocated);
	if (cd->flags & OUT_HEADER) {
	    e = deflateSetHeader(&cd->outStream, &cd->outHeader.header);
	    if (e != Z_OK) {
		goto error;
	    }
	}
	if (cd->compDictObj) {
	    e = SetDeflateDictionary(&cd->outStream, cd->compDictObj);
	    if (e != Z_OK) {
		goto error;
	    }
	}
    }

    Tcl_DStringInit(&cd->decompressed);

    chan = Tcl_StackChannel(interp, &zlibChannelType, cd,
	    Tcl_GetChannelMode(channel), channel);
................................................................................
	ckfree(cd->inBuffer);
	inflateEnd(&cd->inStream);
    }
    if (cd->outBuffer) {
	ckfree(cd->outBuffer);
	deflateEnd(&cd->outStream);
    }
    if (cd->compDictObj) {
	Tcl_DecrRefCount(cd->compDictObj);
    }
    ckfree(cd);
    return NULL;
}
 
/*
 *----------------------------------------------------------------------
 *
................................................................................
    int n,
    int flush,
    int *errorCodePtr)
{
#define MAXBUF	1024
    unsigned char buf[MAXBUF];
    int e, written;
    Tcl_Obj *errObj;

    cd->inStream.next_in = (Bytef *) cd->inBuffer;
    cd->inStream.avail_in = n;

    while (1) {
	cd->inStream.next_out = (Bytef *) buf;
	cd->inStream.avail_out = MAXBUF;

	e = inflate(&cd->inStream, flush);
	if (e == Z_NEED_DICT && cd->compDictObj) {
	    e = SetInflateDictionary(&cd->inStream, cd->compDictObj);
	    if (e == Z_OK) {
		/*
		 * A repetition of Z_NEED_DICT is just an error.
		 */

		cd->inStream.next_out = (Bytef *) buf;
		cd->inStream.avail_out = MAXBUF;
		e = inflate(&cd->inStream, flush);
	    }
	}

	/*
	 * avail_out is now the left over space in the output.  Therefore
	 * "MAXBUF - avail_out" is the amount of bytes generated.
	 */

	written = MAXBUF - cd->inStream.avail_out;
................................................................................
	 * Just indicates that the zlib couldn't consume input/produce output,
	 * and is fixed by supplying more input.
	 *
	 * Otherwise, we've got errors and need to report to higher-up.
	 */

	if ((e != Z_OK) && (e != Z_BUF_ERROR)) {
	    goto handleError;






	}

	/*
	 * Check if the inflate stopped early.
	 */

	if (cd->inStream.avail_in <= 0 && flush != Z_SYNC_FLUSH) {
	    return TCL_OK;
	}
    }

  handleError:
    errObj = Tcl_NewListObj(0, NULL);
    Tcl_ListObjAppendElement(NULL, errObj, Tcl_NewStringObj("-errorcode",-1));
    Tcl_ListObjAppendElement(NULL, errObj,
	    ConvertErrorToList(e, cd->inStream.adler));
    Tcl_ListObjAppendElement(NULL, errObj,
	    Tcl_NewStringObj(cd->inStream.msg, -1));
    Tcl_SetChannelError(cd->parent, errObj);
    *errorCodePtr = EINVAL;
    return TCL_ERROR;
}
 
/*
 *----------------------------------------------------------------------
 *	Finally, the TclZlibInit function. Used to install the zlib API.
 *----------------------------------------------------------------------
 */

int
TclZlibInit(
    Tcl_Interp *interp)
{
    Tcl_Config cfg[2];

    /*
     * This does two things. It creates a counter used in the creation of
     * stream commands, and it creates the namespace that will contain those
     * commands.
     */

    Tcl_Eval(interp, "namespace eval ::tcl::zlib {variable cmdcounter 0}");

    /*
     * Create the public scripted interface to this file's functionality.
     */

    Tcl_CreateObjCommand(interp, "zlib", ZlibCmd, 0, 0);

    /*
     * Store the underlying configuration information.
     *
     * TODO: Describe whether we're using the system version of the library or
     * a compatibility version built into Tcl?
     */

    cfg[0].key = "zlibVersion";
    cfg[0].value = zlibVersion();
    cfg[1].key = NULL;
    Tcl_RegisterConfig(interp, "zlib", cfg, "ascii");

    /*
     * Formally provide the package as a Tcl built-in.
     */

    return Tcl_PkgProvide(interp, "zlib", TCL_ZLIB_VERSION);
}
 
/*
 *----------------------------------------------------------------------
 *	Stubs used when a suitable zlib installation was not found during
 *	configure.
................................................................................
Tcl_ZlibAdler32(
    unsigned int adler,
    const char *buf,
    int len)
{
    return 0;
}

void
Tcl_ZlibStreamSetCompressionDictionary(
    Tcl_ZlibStream zshandle,
    Tcl_Obj *compressionDictionaryObj)
{
    /* Do nothing. */
}
#endif /* HAVE_ZLIB */
 
/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */

Changes to tests/zlib.test.

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#
# Copyright (c) 1996-1998 by Sun Microsystems, Inc.
# Copyright (c) 1998-1999 by Scriptics Corporation.
#
# See the file "license.terms" for information on usage and redistribution of
# this file, and for a DISCLAIMER OF ALL WARRANTIES.

if {[lsearch [namespace children] ::tcltest] == -1} {
    package require tcltest 2.1
    namespace import -force ::tcltest::*
}

testConstraint zlib [llength [info commands zlib]]
 
test zlib-1.1 {zlib basics} -constraints zlib -returnCodes error -body {
    zlib
} -result {wrong # args: should be "zlib command arg ?...?"}
test zlib-1.2 {zlib basics} -constraints zlib -returnCodes error -body {
    zlib ? {}
} -result {bad command "?": must be adler32, compress, crc32, decompress, deflate, gunzip, gzip, inflate, push, or stream}







test zlib-2.1 {zlib compress/decompress} zlib {
    zlib decompress [zlib compress abcdefghijklm]
} abcdefghijklm

test zlib-3.1 {zlib deflate/inflate} zlib {
    zlib inflate [zlib deflate abcdefghijklm]
................................................................................

test zlib-7.0 {zlib stream} -constraints zlib -returnCodes error -setup {
    set s [zlib stream compress]
} -body {
    $s ?
} -cleanup {
    $s close
} -result {bad option "?": must be add, checksum, close, eof, finalize, flush, fullflush, get, put, or reset}
test zlib-7.1 {zlib stream} zlib {
    set s [zlib stream compress]
    $s put -finalize abcdeEDCBA
    set data [$s get]
    set result [list [$s get] [format %x [$s checksum]]]
    $s close
    lappend result [zlib decompress $data]
................................................................................
    fileevent $r readable {set msg [read $r];lappend ::res $msg;if {[eof $r]} {set ::done 1}}
    after 250 {lappend ::res MIDDLE}
    vwait ::done
    set ::res
} -cleanup {
    catch {close $r}
} -result {qwertyuiop MIDDLE asdfghjkl}






























































































































































test zlib-9.1 "check fcopy with push" -constraints zlib -setup {
    set sfile [makeFile {} testsrc.gz]
    set file [makeFile {} test.gz]
    set f [open $sfile wb]
    puts -nonewline $f [zlib gzip [string repeat a 81920]]
    close $f






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#
# Copyright (c) 1996-1998 by Sun Microsystems, Inc.
# Copyright (c) 1998-1999 by Scriptics Corporation.
#
# See the file "license.terms" for information on usage and redistribution of
# this file, and for a DISCLAIMER OF ALL WARRANTIES.

if {"::tcltest" ni [namespace children]} {
    package require tcltest 2.1
    namespace import -force ::tcltest::*
}

testConstraint zlib [llength [info commands zlib]]
 
test zlib-1.1 {zlib basics} -constraints zlib -returnCodes error -body {
    zlib
} -result {wrong # args: should be "zlib command arg ?...?"}
test zlib-1.2 {zlib basics} -constraints zlib -returnCodes error -body {
    zlib ? {}
} -result {bad command "?": must be adler32, compress, crc32, decompress, deflate, gunzip, gzip, inflate, push, or stream}
test zlib-1.3 {zlib basics} -constraints zlib -body {
    zlib::pkgconfig list
} -result zlibVersion
test zlib-1.4 {zlib basics} -constraints zlib -body {
    package present zlib
} -result 2.0

test zlib-2.1 {zlib compress/decompress} zlib {
    zlib decompress [zlib compress abcdefghijklm]
} abcdefghijklm

test zlib-3.1 {zlib deflate/inflate} zlib {
    zlib inflate [zlib deflate abcdefghijklm]
................................................................................

test zlib-7.0 {zlib stream} -constraints zlib -returnCodes error -setup {
    set s [zlib stream compress]
} -body {
    $s ?
} -cleanup {
    $s close
} -result {bad option "?": must be add, checksum, close, eof, finalize, flush, fullflush, get, header, put, or reset}
test zlib-7.1 {zlib stream} zlib {
    set s [zlib stream compress]
    $s put -finalize abcdeEDCBA
    set data [$s get]
    set result [list [$s get] [format %x [$s checksum]]]
    $s close
    lappend result [zlib decompress $data]
................................................................................
    fileevent $r readable {set msg [read $r];lappend ::res $msg;if {[eof $r]} {set ::done 1}}
    after 250 {lappend ::res MIDDLE}
    vwait ::done
    set ::res
} -cleanup {
    catch {close $r}
} -result {qwertyuiop MIDDLE asdfghjkl}
test zlib-8.6 {transformation and fconfigure} -setup {
    set file [makeFile {} test.z]
    set fd [open $file wb]
} -constraints zlib -body {
    list [fconfigure $fd] [zlib push compress $fd; fconfigure $fd] \
	[chan pop $fd; fconfigure $fd]
} -cleanup {
    catch {close $fd}
    removeFile $file
} -result {{-blocking 1 -buffering full -buffersize 4096 -encoding binary -eofchar {} -translation lf} {-blocking 1 -buffering full -buffersize 4096 -encoding binary -eofchar {} -translation lf -checksum 1 -dictionary {}} {-blocking 1 -buffering full -buffersize 4096 -encoding binary -eofchar {} -translation lf}}
test zlib-8.7 {transformation and fconfigure} -setup {
    set file [makeFile {} test.gz]
    set fd [open $file wb]
} -constraints zlib -body {
    list [fconfigure $fd] [zlib push gzip $fd; fconfigure $fd] \
	[chan pop $fd; fconfigure $fd]
} -cleanup {
    catch {close $fd}
    removeFile $file
} -result {{-blocking 1 -buffering full -buffersize 4096 -encoding binary -eofchar {} -translation lf} {-blocking 1 -buffering full -buffersize 4096 -encoding binary -eofchar {} -translation lf -checksum 0} {-blocking 1 -buffering full -buffersize 4096 -encoding binary -eofchar {} -translation lf}}
# Input is headers from fetching SPDY draft
# Dictionary is that which is proposed _in_ SPDY draft
set spdyHeaders "HTTP/1.0 200 OK\r\nContent-Type: text/html; charset=utf-8\r\nX-Robots-Tag: noarchive\r\nLast-Modified: Tue, 05 Jun 2012 02:43:25 GMT\r\nETag: \"1338864205129|#public|0|en|||0\"\r\nExpires: Tue, 05 Jun 2012 16:17:11 GMT\r\nDate: Tue, 05 Jun 2012 16:17:06 GMT\r\nCache-Control: public, max-age=5\r\nX-Content-Type-Options: nosniff\r\nX-XSS-Protection: 1; mode=block\r\nServer: GSE\r\n"
set spdyDict "optionsgetheadpostputdeletetraceacceptaccept-charsetaccept-encodingaccept-languageauthorizationexpectfromhostif-modified-sinceif-matchif-none-matchif-rangeif-unmodifiedsincemax-forwardsproxy-authorizationrangerefererteuser-agent100101200201202203204205206300301302303304305306307400401402403404405406407408409410411412413414415416417500501502503504505accept-rangesageetaglocationproxy-authenticatepublicretry-afterservervarywarningwww-authenticateallowcontent-basecontent-encodingcache-controlconnectiondatetrailertransfer-encodingupgradeviawarningcontent-languagecontent-lengthcontent-locationcontent-md5content-rangecontent-typeetagexpireslast-modifiedset-cookieMondayTuesdayWednesdayThursdayFridaySaturdaySundayJanFebMarAprMayJunJulAugSepOctNovDecchunkedtext/htmlimage/pngimage/jpgimage/gifapplication/xmlapplication/xhtmltext/plainpublicmax-agecharset=iso-8859-1utf-8gzipdeflateHTTP/1.1statusversionurl"
test zlib-8.8 {transformtion and fconfigure} -setup {
    lassign [chan pipe] inSide outSide
} -constraints zlib -body {
    zlib push compress $outSide -dictionary $spdyDict
    fconfigure $outSide -blocking 0 -translation binary -buffering none
    fconfigure $inSide -blocking 0 -translation binary
    puts -nonewline $outSide $spdyHeaders
    chan pop $outSide
    set compressed [read $inSide]
    catch {zlib decompress $compressed} err opt
    list [string length [zlib compress $spdyHeaders]] \
	[string length $compressed] \
	$err [dict get $opt -errorcode] [zlib adler32 $spdyDict]
} -cleanup {
    catch {close $outSide}
    catch {close $inSide}
} -result {260 222 {need dictionary} {TCL ZLIB NEED_DICT 2381337010} 2381337010}
test zlib-8.9 {transformtion and fconfigure} -setup {
    lassign [chan pipe] inSide outSide
    set strm [zlib stream decompress]
} -constraints zlib -body {
    zlib push compress $outSide -dictionary $spdyDict
    fconfigure $outSide -blocking 0 -translation binary -buffering none
    fconfigure $inSide -blocking 0 -translation binary
    puts -nonewline $outSide $spdyHeaders
    set result [fconfigure $outSide -checksum]
    chan pop $outSide
    $strm put -dictionary $spdyDict [read $inSide]
    lappend result [string length $spdyHeaders] [string length [$strm get]]
} -cleanup {
    catch {close $outSide}
    catch {close $inSide}
    catch {$strm close}
} -result {3064818174 358 358}
test zlib-8.10 {transformtion and fconfigure} -setup {
    lassign [chan pipe] inSide outSide
} -constraints zlib -body {
    zlib push deflate $outSide -dictionary $spdyDict
    fconfigure $outSide -blocking 0 -translation binary -buffering none
    fconfigure $inSide -blocking 0 -translation binary
    puts -nonewline $outSide $spdyHeaders
    chan pop $outSide
    set compressed [read $inSide]
    catch {zlib inflate $compressed} err opt
    list [string length [zlib deflate $spdyHeaders]] \
	[string length $compressed] \
	$err [dict get $opt -errorcode]
} -cleanup {
    catch {close $outSide}
    catch {close $inSide}
} -result {254 212 {data error} {TCL ZLIB DATA}}
test zlib-8.11 {transformtion and fconfigure} -setup {
    lassign [chan pipe] inSide outSide
    set strm [zlib stream inflate]
} -constraints zlib -body {
    zlib push deflate $outSide -dictionary $spdyDict
    fconfigure $outSide -blocking 0 -translation binary -buffering none
    fconfigure $inSide -blocking 0 -translation binary
    puts -nonewline $outSide $spdyHeaders
    chan pop $outSide
    $strm put -dictionary $spdyDict [read $inSide]
    list [string length $spdyHeaders] [string length [$strm get]]
} -cleanup {
    catch {close $outSide}
    catch {close $inSide}
    catch {$strm close}
} -result {358 358}
test zlib-8.12 {transformtion and fconfigure} -setup {
    lassign [chan pipe] inSide outSide
    set strm [zlib stream compress]
} -constraints zlib -body {
    $strm put -dictionary $spdyDict -finalize $spdyHeaders
    zlib push decompress $inSide
    fconfigure $outSide -blocking 0 -translation binary
    fconfigure $inSide -translation binary -dictionary $spdyDict
    puts -nonewline $outSide [$strm get]
    close $outSide
    list [string length $spdyHeaders] [string length [read $inSide]] \
	[fconfigure $inSide -checksum]
} -cleanup {
    catch {close $outSide}
    catch {close $inSide}
    catch {$strm close}
} -result {358 358 3064818174}
test zlib-8.13 {transformtion and fconfigure} -setup {
    lassign [chan pipe] inSide outSide
    set strm [zlib stream compress]
} -constraints zlib -body {
    $strm put -dictionary $spdyDict -finalize $spdyHeaders
    zlib push decompress $inSide -dictionary $spdyDict
    fconfigure $outSide -blocking 0 -translation binary
    fconfigure $inSide -translation binary
    puts -nonewline $outSide [$strm get]
    close $outSide
    list [string length $spdyHeaders] [string length [read $inSide]] \
	[fconfigure $inSide -checksum]
} -cleanup {
    catch {close $outSide}
    catch {close $inSide}
    catch {$strm close}
} -result {358 358 3064818174}
test zlib-8.14 {transformtion and fconfigure} -setup {
    lassign [chan pipe] inSide outSide
    set strm [zlib stream deflate]
} -constraints zlib -body {
    $strm put -finalize -dictionary $spdyDict $spdyHeaders
    zlib push inflate $inSide
    fconfigure $outSide -blocking 0 -buffering none -translation binary
    fconfigure $inSide -translation binary -dictionary $spdyDict
    puts -nonewline $outSide [$strm get]
    close $outSide
    list [string length $spdyHeaders] [string length [read $inSide]]
} -cleanup {
    catch {close $outSide}
    catch {close $inSide}
    catch {$strm close}
} -result {358 358}
test zlib-8.15 {transformtion and fconfigure} -setup {
    lassign [chan pipe] inSide outSide
    set strm [zlib stream deflate]
} -constraints zlib -body {
    $strm put -finalize -dictionary $spdyDict $spdyHeaders
    zlib push inflate $inSide -dictionary $spdyDict
    fconfigure $outSide -blocking 0 -buffering none -translation binary
    fconfigure $inSide -translation binary
    puts -nonewline $outSide [$strm get]
    close $outSide
    list [string length $spdyHeaders] [string length [read $inSide]]
} -cleanup {
    catch {close $outSide}
    catch {close $inSide}
    catch {$strm close}
} -result {358 358}

test zlib-9.1 "check fcopy with push" -constraints zlib -setup {
    set sfile [makeFile {} testsrc.gz]
    set file [makeFile {} test.gz]
    set f [open $sfile wb]
    puts -nonewline $f [zlib gzip [string repeat a 81920]]
    close $f