TEA (tclconfig) Source Code

/*
 * tclZipfs.c --
 *
 *    Implementation of the ZIP filesystem used in TIP 430
 *    Adapted from the implentation for AndroWish.
 *
 * Coptright (c) 2016-2017 Sean Woods <[email protected]>
 * Copyright (c) 2013-2015 Christian Werner <[email protected]>
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * This file is almost verbatim to the implementation from the tcl core
 * The prefix is modified because certain bug fixes for unc paths are not in
 * for a core that requires this file
 */

#include "tclInt.h"
#include "tclFileSystem.h"

#if !defined(_WIN32) && !defined(_WIN64)
#include <sys/mman.h>
#else
#include <winbase.h>
#endif
#include <errno.h>
#include <string.h>
#include <sys/stat.h>
#include <time.h>
#include <stdlib.h>
#include <fcntl.h>

#ifndef MAP_FILE
#define MAP_FILE 0
#endif

#ifdef HAVE_ZLIB
#include "zlib.h"
#include "crypt.h"

/*
** Pre TIP430 style zipfs prefix
** //zipfs:/ doesn't work straight out of the box on either windows or Unix
*/
#define ZIPFS_VOLUME      "zipfs:/"
#define ZIPFS_VOLUME_LEN  7
#define ZIPFS_APP_MOUNT   "zipfs:/app"
#define ZIPFS_ZIP_MOUNT   "zipfs:/lib/tcl"
/*
 * Various constants and offsets found in ZIP archive files
 */

#define ZIP_SIG_LEN                     4

/* Local header of ZIP archive member (at very beginning of each member). */
#define ZIP_LOCAL_HEADER_SIG            0x04034b50
#define ZIP_LOCAL_HEADER_LEN            30
#define ZIP_LOCAL_SIG_OFFS              0
#define ZIP_LOCAL_VERSION_OFFS          4
#define ZIP_LOCAL_FLAGS_OFFS            6
#define ZIP_LOCAL_COMPMETH_OFFS         8
#define ZIP_LOCAL_MTIME_OFFS            10
#define ZIP_LOCAL_MDATE_OFFS            12
#define ZIP_LOCAL_CRC32_OFFS            14
#define ZIP_LOCAL_COMPLEN_OFFS          18
#define ZIP_LOCAL_UNCOMPLEN_OFFS        22
#define ZIP_LOCAL_PATHLEN_OFFS          26
#define ZIP_LOCAL_EXTRALEN_OFFS         28

/* Central header of ZIP archive member at end of ZIP file. */
#define ZIP_CENTRAL_HEADER_SIG          0x02014b50
#define ZIP_CENTRAL_HEADER_LEN          46
#define ZIP_CENTRAL_SIG_OFFS            0
#define ZIP_CENTRAL_VERSIONMADE_OFFS    4
#define ZIP_CENTRAL_VERSION_OFFS        6
#define ZIP_CENTRAL_FLAGS_OFFS          8
#define ZIP_CENTRAL_COMPMETH_OFFS       10
#define ZIP_CENTRAL_MTIME_OFFS          12
#define ZIP_CENTRAL_MDATE_OFFS          14
#define ZIP_CENTRAL_CRC32_OFFS          16
#define ZIP_CENTRAL_COMPLEN_OFFS        20
#define ZIP_CENTRAL_UNCOMPLEN_OFFS      24
#define ZIP_CENTRAL_PATHLEN_OFFS        28
#define ZIP_CENTRAL_EXTRALEN_OFFS       30
#define ZIP_CENTRAL_FCOMMENTLEN_OFFS    32
#define ZIP_CENTRAL_DISKFILE_OFFS       34
#define ZIP_CENTRAL_IATTR_OFFS          36
#define ZIP_CENTRAL_EATTR_OFFS          38
#define ZIP_CENTRAL_LOCALHDR_OFFS       42

/* Central end signature at very end of ZIP file. */
#define ZIP_CENTRAL_END_SIG             0x06054b50
#define ZIP_CENTRAL_END_LEN             22
#define ZIP_CENTRAL_END_SIG_OFFS        0
#define ZIP_CENTRAL_DISKNO_OFFS         4
#define ZIP_CENTRAL_DISKDIR_OFFS        6
#define ZIP_CENTRAL_ENTS_OFFS           8
#define ZIP_CENTRAL_TOTALENTS_OFFS      10
#define ZIP_CENTRAL_DIRSIZE_OFFS        12
#define ZIP_CENTRAL_DIRSTART_OFFS       16
#define ZIP_CENTRAL_COMMENTLEN_OFFS     20

#define ZIP_MIN_VERSION                 20
#define ZIP_COMPMETH_STORED             0
#define ZIP_COMPMETH_DEFLATED           8

#define ZIP_PASSWORD_END_SIG            0x5a5a4b50

/* Macro to report errors only if an interp is present */
#define ZIPFS_ERROR(interp,errstr) \
    if(interp != NULL) Tcl_SetObjResult(interp, Tcl_NewStringObj(errstr, -1));

/*
 * Macros to read and write 16 and 32 bit integers from/to ZIP archives.
 */

#define zip_read_int(p)                         \
    ((p)[0] | ((p)[1] << 8) | ((p)[2] << 16) | ((p)[3] << 24))
#define zip_read_short(p)                       \
    ((p)[0] | ((p)[1] << 8))

#define zip_write_int(p, v)                    \
    (p)[0] = (v) & 0xff; (p)[1] = ((v) >> 8) & 0xff;        \
    (p)[2] = ((v) >> 16) & 0xff; (p)[3] = ((v) >> 24) & 0xff;
#define zip_write_short(p, v)                    \
    (p)[0] = (v) & 0xff; (p)[1] = ((v) >> 8) & 0xff;

/*
 * Windows drive letters.
 */

#if defined(_WIN32) || defined(_WIN64)
#define HAS_DRIVES 1
static const char drvletters[] =
    "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
#else
#define HAS_DRIVES 0
#endif

/*
 * Mutex to protect localtime(3) when no reentrant version available.
 */

#if !defined(_WIN32) && !defined(_WIN64)
#ifndef HAVE_LOCALTIME_R
#ifdef TCL_THREADS
TCL_DECLARE_MUTEX(localtimeMutex)
#endif
#endif
#endif

/*
 * In-core description of mounted ZIP archive file.
 */

typedef struct ZipFile {
    char *name;               /* Archive name */
    Tcl_Channel chan;         /* Channel handle or NULL */
    unsigned char *data;      /* Memory mapped or malloc'ed file */
    long length;              /* Length of memory mapped file */
    unsigned char *tofree;    /* Non-NULL if malloc'ed file */
    int nfiles;               /* Number of files in archive */
    int baseoffs;             /* Archive start */
    int baseoffsp;            /* Password start */
    int centoffs;             /* Archive directory start */
    char pwbuf[264];          /* Password buffer */
#if defined(_WIN32) || defined(_WIN64)
    HANDLE mh;
#endif
    int nopen;                /* Number of open files on archive */
    struct ZipEntry *entries; /* List of files in archive */
    struct ZipEntry *topents; /* List of top-level dirs in archive */
#if HAS_DRIVES
    int mntdrv;                  /* Drive letter of mount point */
#endif
    int mntptlen;             /* Length of mount point */
    char mntpt[1];            /* Mount point */
} ZipFile;

/*
 * In-core description of file contained in mounted ZIP archive.
 */

typedef struct ZipEntry {
    char *name;               /* The full pathname of the virtual file */
    ZipFile *zipfile;         /* The ZIP file holding this virtual file */
    long offset;              /* Data offset into memory mapped ZIP file */
    int nbyte;                /* Uncompressed size of the virtual file */
    int nbytecompr;           /* Compressed size of the virtual file */
    int cmeth;                /* Compress method */
    int isdir;                  /* Set to 1 if directory, or -1 if root */
    int depth;                   /* Number of slashes in path. */
    int crc32;                /* CRC-32 */
    int timestamp;            /* Modification time */
    int isenc;                /* True if data is encrypted */
    unsigned char *data;      /* File data if written */
    struct ZipEntry *next;    /* Next file in the same archive */
    struct ZipEntry *tnext;   /* Next top-level dir in archive */
} ZipEntry;

/*
 * File channel for file contained in mounted ZIP archive.
 */

typedef struct ZipChannel {
    ZipFile *zipfile;         /* The ZIP file holding this channel */
    ZipEntry *zipentry;       /* Pointer back to virtual file */
    unsigned long nmax;       /* Max. size for write */
    unsigned long nbyte;      /* Number of bytes of uncompressed data */
    unsigned long nread;      /* Pos of next byte to be read from the channel */
    unsigned char *ubuf;      /* Pointer to the uncompressed data */
    int iscompr;              /* True if data is compressed */
    int isdir;                  /* Set to 1 if directory, or -1 if root */
    int isenc;                /* True if data is encrypted */
    int iswr;                 /* True if open for writing */
    unsigned long keys[3];    /* Key for decryption */
} ZipChannel;

/*
 * Global variables.
 *
 * Most are kept in single ZipFS struct. When build with threading
 * support this struct is protected by the ZipFSMutex (see below).
 *
 * The "fileHash" component is the process wide global table of all known
 * ZIP archive members in all mounted ZIP archives.
 *
 * The "zipHash" components is the process wide global table of all mounted
 * ZIP archive files.
 */

static struct {
    int initialized;        /* True when initialized */
    int lock;            /* RW lock, see below */
    int waiters;        /* RW lock, see below */
    int wrmax;            /* Maximum write size of a file */
    int idCount;        /* Counter for channel names */
    Tcl_HashTable fileHash;    /* File name to ZipEntry mapping */
    Tcl_HashTable zipHash;    /* Mount to ZipFile mapping */
} ZipFS = {
    0, 0, 0, 0, 0,
};

/*
 * For password rotation.
 */

static const char pwrot[16] = {
    0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
    0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0
};

/*
 * Table to compute CRC32.
 */

static const unsigned long crc32tab[256] = {
    0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
    0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
    0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
    0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
    0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
    0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
    0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
    0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
    0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
    0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
    0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
    0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
    0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
    0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
    0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
    0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
    0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
    0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
    0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
    0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
    0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
    0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
    0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
    0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
    0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
    0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
    0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
    0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
    0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
    0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
    0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
    0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
    0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
    0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
    0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
    0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
    0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
    0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
    0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
    0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
    0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
    0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
    0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
    0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
    0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
    0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
    0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
    0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
    0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
    0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
    0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
    0x2d02ef8d,
};

const char *zipfs_literal_tcl_library=NULL;

Tcl_Obj *TclZipfs_TclLibrary(void);


/*
 *-------------------------------------------------------------------------
 *
 * ReadLock, WriteLock, Unlock --
 *
 *    POSIX like rwlock functions to support multiple readers
 *    and single writer on internal structs.
 *
 *    Limitations:
 *    - a read lock cannot be promoted to a write lock
 *    - a write lock may not be nested
 *
 *-------------------------------------------------------------------------
 */

TCL_DECLARE_MUTEX(ZipFSMutex)

#ifdef TCL_THREADS

static Tcl_Condition ZipFSCond;

static void
ReadLock(void)
{
    Tcl_MutexLock(&ZipFSMutex);
    while (ZipFS.lock < 0) {
        ZipFS.waiters++;
        Tcl_ConditionWait(&ZipFSCond, &ZipFSMutex, NULL);
        ZipFS.waiters--;
    }
    ZipFS.lock++;
    Tcl_MutexUnlock(&ZipFSMutex);
}

static void
WriteLock(void)
{
    Tcl_MutexLock(&ZipFSMutex);
    while (ZipFS.lock != 0) {
        ZipFS.waiters++;
        Tcl_ConditionWait(&ZipFSCond, &ZipFSMutex, NULL);
        ZipFS.waiters--;
    }
    ZipFS.lock = -1;
    Tcl_MutexUnlock(&ZipFSMutex);
}

static void
Unlock(void)
{
    Tcl_MutexLock(&ZipFSMutex);
    if (ZipFS.lock > 0) {
        --ZipFS.lock;
    } else if (ZipFS.lock < 0) {
        ZipFS.lock = 0;
    }
    if ((ZipFS.lock == 0) && (ZipFS.waiters > 0)) {
        Tcl_ConditionNotify(&ZipFSCond);
    }
    Tcl_MutexUnlock(&ZipFSMutex);
}

#else

#define ReadLock()    do {} while (0)
#define WriteLock()    do {} while (0)
#define Unlock()    do {} while (0)

#endif

/*
 *-------------------------------------------------------------------------
 *
 * DosTimeDate, ToDosTime, ToDosDate --
 *
 *    Functions to perform conversions between DOS time stamps
 *    and POSIX time_t.
 *
 *-------------------------------------------------------------------------
 */

static time_t
DosTimeDate(int dosDate, int dosTime)
{
    struct tm tm;
    time_t ret;

    memset(&tm, 0, sizeof (tm));
    tm.tm_year = (((dosDate & 0xfe00) >> 9) + 80);
    tm.tm_mon = ((dosDate & 0x1e0) >> 5) - 1;
    tm.tm_mday = dosDate & 0x1f;
    tm.tm_hour = (dosTime & 0xf800) >> 11;
    tm.tm_min = (dosTime & 0x7e) >> 5;
    tm.tm_sec = (dosTime & 0x1f) << 1;
    ret = mktime(&tm);
    if (ret == (time_t) -1) {
        /* fallback to 1980-01-01T00:00:00+00:00 (DOS epoch) */
        ret = (time_t) 315532800;
    }
    return ret;
}

static int
ToDosTime(time_t when)
{
    struct tm *tmp, tm;

#ifdef TCL_THREADS
#if defined(_WIN32) || defined(_WIN64)
    /* Win32 uses thread local storage */
    tmp = localtime(&when);
    tm = *tmp;
#else
#ifdef HAVE_LOCALTIME_R
    tmp = &tm;
    localtime_r(&when, tmp);
#else
    Tcl_MutexLock(&localtimeMutex);
    tmp = localtime(&when);
    tm = *tmp;
    Tcl_MutexUnlock(&localtimeMutex);
#endif
#endif
#else
    tmp = localtime(&when);
    tm = *tmp;
#endif
    return (tm.tm_hour << 11) | (tm.tm_min << 5) | (tm.tm_sec >> 1);
}

static int
ToDosDate(time_t when)
{
    struct tm *tmp, tm;

#ifdef TCL_THREADS
#if defined(_WIN32) || defined(_WIN64)
    /* Win32 uses thread local storage */
    tmp = localtime(&when);
    tm = *tmp;
#else
#ifdef HAVE_LOCALTIME_R
    tmp = &tm;
    localtime_r(&when, tmp);
#else
    Tcl_MutexLock(&localtimeMutex);
    tmp = localtime(&when);
    tm = *tmp;
    Tcl_MutexUnlock(&localtimeMutex);
#endif
#endif
#else
    tmp = localtime(&when);
    tm = *tmp;
#endif
    return ((tm.tm_year - 80) << 9) | ((tm.tm_mon + 1) << 5) | tm.tm_mday;
}

/*
 *-------------------------------------------------------------------------
 *
 * CountSlashes --
 *
 *    This function counts the number of slashes in a pathname string.
 *
 * Results:
 *    Number of slashes found in string.
 *
 * Side effects:
 *    None.
 *
 *-------------------------------------------------------------------------
 */

static int
CountSlashes(const char *string)
{
    int count = 0;
    const char *p = string;

    while (*p != '\0') {
        if (*p == '/') {
            count++;
        }
        p++;
    }
    return count;
}

/*
 *-------------------------------------------------------------------------
 *
 * CanonicalPath --
 *
 *    This function computes the canonical path from a directory
 *    and file name components into the specified Tcl_DString.
 *
 * Results:
 *    Returns the pointer to the canonical path contained in the
 *    specified Tcl_DString.
 *
 * Side effects:
 *    Modifies the specified Tcl_DString.
 *
 *-------------------------------------------------------------------------
 */

static char *
CanonicalPath(const char *root, const char *tail, Tcl_DString *dsPtr,int ZIPFSPATH)
{
    char *path;
    char *result;
    int i, j, c, isunc = 0, isvfs=0, n=0;
#if HAS_DRIVES
    int zipfspath=1;
    if (
        (tail[0] != '\0')
        && (strchr(drvletters, tail[0]) != NULL)
        && (tail[1] == ':')
    ) {
        tail += 2;
        zipfspath=0;
    }
    /* UNC style path */
    if (tail[0] == '\\') {
        root = "";
        ++tail;
        zipfspath=0;
    }
    if (tail[0] == '\\') {
        root = "/";
        ++tail;
        zipfspath=0;
    }
    if(zipfspath) {
#endif
        /* UNC style path */
        if(root && strncmp(root,ZIPFS_VOLUME,ZIPFS_VOLUME_LEN)==0) {
            isvfs=1;
        } else if (tail && strncmp(tail,ZIPFS_VOLUME,ZIPFS_VOLUME_LEN) == 0) {
            isvfs=2;
        }
        if(isvfs!=1) {
            if ((root[0] == '/') && (root[1] == '/')) {
            isunc = 1;
            }
        }
#if HAS_DRIVES
    }
#endif
    if(isvfs!=2) {
        if (tail[0] == '/') {
            if(isvfs!=1) {
                root = "";
            }
            ++tail;
            isunc = 0;
        }
        if (tail[0] == '/') {
            if(isvfs!=1) {
                root = "/";
            }
            ++tail;
            isunc = 1;
        }
    }
    i = strlen(root);
    j = strlen(tail);
    if(isvfs==1) {
        if(i>ZIPFS_VOLUME_LEN) {
            Tcl_DStringSetLength(dsPtr, i + j + 1);
            path = Tcl_DStringValue(dsPtr);
            memcpy(path, root, i);
            path[i++] = '/';
            memcpy(path + i, tail, j);
        } else {
            Tcl_DStringSetLength(dsPtr, i + j);
            path = Tcl_DStringValue(dsPtr);
            memcpy(path, root, i);
            memcpy(path + i, tail, j);
        }
    } else if(isvfs==2) {
        Tcl_DStringSetLength(dsPtr, j);
        path = Tcl_DStringValue(dsPtr);
        memcpy(path, tail, j);
    } else {
        if (ZIPFSPATH) {
            Tcl_DStringSetLength(dsPtr, i + j + ZIPFS_VOLUME_LEN);
            path = Tcl_DStringValue(dsPtr);
            memcpy(path, ZIPFS_VOLUME, ZIPFS_VOLUME_LEN);
            memcpy(path + ZIPFS_VOLUME_LEN + i , tail, j);
        } else {
            Tcl_DStringSetLength(dsPtr, i + j + 1);
            path = Tcl_DStringValue(dsPtr);
            memcpy(path, root, i);
            path[i++] = '/';
            memcpy(path + i, tail, j);
        }
    }
#if HAS_DRIVES
    for (i = 0; path[i] != '\0'; i++) {
        if (path[i] == '\\') {
            path[i] = '/';
        }
    }
#endif
    if(ZIPFSPATH) {
        n=ZIPFS_VOLUME_LEN;
    } else {
        n=0;
    }
    for (i = j = n; (c = path[i]) != '\0'; i++) {
        if (c == '/') {
            int c2 = path[i + 1];
            if (c2 == '/') {
                continue;
            }
            if (c2 == '.') {
                int c3 = path[i + 2];
                if ((c3 == '/') || (c3 == '\0')) {
                    i++;
                    continue;
                }
                if (
                    (c3 == '.')
                    && ((path[i + 3] == '/') || (path [i + 3] == '\0'))
                ) {
                    i += 2;
                    while ((j > 0) && (path[j - 1] != '/')) {
                        j--;
                    }
                    if (j > isunc) {
                        --j;
                        while ((j > 1 + isunc) && (path[j - 2] == '/')) {
                            j--;
                        }
                    }
                    continue;
                }
            }
        }
        path[j++] = c;
    }
    if (j == 0) {
        path[j++] = '/';
    }
    path[j] = 0;
    Tcl_DStringSetLength(dsPtr, j);
    result=Tcl_DStringValue(dsPtr);
    return result;
}


/*
 *-------------------------------------------------------------------------
 *
 * AbsolutePath --
 *
 *        This function computes the absolute path from a given
 *        (relative) path name into the specified Tcl_DString.
 *
 * Results:
 *        Returns the pointer to the absolute path contained in the
 *        specified Tcl_DString.
 *
 * Side effects:
 *        Modifies the specified Tcl_DString.
 *
 *-------------------------------------------------------------------------
 */

static char *
AbsolutePath(const char *path,
#if HAS_DRIVES
             int *drvPtr,
#endif
             Tcl_DString *dsPtr)
{
    char *result;

#if HAS_DRIVES
    if (drvPtr != NULL) {
        *drvPtr = 0;
    }
#endif
    if (*path == '~') {
        Tcl_DStringAppend(dsPtr, path, -1);
        return Tcl_DStringValue(dsPtr);
    }
    if ((*path != '/')
#if HAS_DRIVES
        && (*path != '\\') &&
        (((*path != '\0') && (strchr(drvletters, *path) == NULL)) ||
         (path[1] != ':'))
#endif
        ) {
        Tcl_DString pwd;

        /* relative path */
        Tcl_DStringInit(&pwd);
        Tcl_GetCwd(NULL, &pwd);
        result = Tcl_DStringValue(&pwd);
#if HAS_DRIVES
        if ((result[0] != '\0') && (strchr(drvletters, result[0]) != NULL) &&
            (result[1] == ':')) {
            if (drvPtr != NULL) {
                drvPtr[0] = result[0];
                if ((drvPtr[0] >= 'a') && (drvPtr[0] <= 'z')) {
                    drvPtr[0] -= 'a' - 'A';
                }
            }
            result += 2;
        }
#endif
        result = CanonicalPath(result, path, dsPtr, 0);
        Tcl_DStringFree(&pwd);
    } else {
        /* absolute path */
#if HAS_DRIVES
        if ((path[0] != '\0') && (strchr(drvletters, path[0]) != NULL) &&
            (path[1] == ':')) {
            if (drvPtr != NULL) {
                drvPtr[0] = path[0];
                if ((drvPtr[0] >= 'a') && (drvPtr[0] <= 'z')) {
                    drvPtr[0] -= 'a' - 'A';
                }
            }
        }
#endif
        result = CanonicalPath("", path, dsPtr, 0);
    }
    return result;
}

/*
 *-------------------------------------------------------------------------
 *
 * ZipFSLookup --
 *
 *    This function returns the ZIP entry struct corresponding to
 *    the ZIP archive member of the given file name.
 *
 * Results:
 *    Returns the pointer to ZIP entry struct or NULL if the
 *    the given file name could not be found in the global list
 *    of ZIP archive members.
 *
 * Side effects:
 *    None.
 *
 *-------------------------------------------------------------------------
 */

static ZipEntry *
ZipFSLookup(char *filename)
{
    Tcl_HashEntry *hPtr;
    ZipEntry *z;
    Tcl_DString ds;
    Tcl_DStringInit(&ds);
    hPtr = Tcl_FindHashEntry(&ZipFS.fileHash, filename);
    z = hPtr ? (ZipEntry *) Tcl_GetHashValue(hPtr) : NULL;
    Tcl_DStringFree(&ds);
    return z;
}

#ifdef NEVER_USED

/*
 *-------------------------------------------------------------------------
 *
 * ZipFSLookupMount --
 *
 *    This function returns an indication if the given file name
 *    corresponds to a mounted ZIP archive file.
 *
 * Results:
 *    Returns true, if the given file name is a mounted ZIP archive file.
 *
 * Side effects:
 *    None.
 *
 *-------------------------------------------------------------------------
 */

static int
ZipFSLookupMount(char *filename)
{
    Tcl_HashEntry *hPtr;
    Tcl_HashSearch search;
    ZipFile *zf;
    int match = 0;
    hPtr = Tcl_FirstHashEntry(&ZipFS.zipHash, &search);
    while (hPtr != NULL) {
        if ((zf = (ZipFile *) Tcl_GetHashValue(hPtr)) == NULL) continue;
        if (strcmp(zf->mntpt, filename) == 0) {
            match = 1;
            break;
        }
        hPtr = Tcl_NextHashEntry(&search);
    }
    return match;
}
#endif

/*
 *-------------------------------------------------------------------------
 *
 * ZipFSCloseArchive --
 *
 *    This function closes a mounted ZIP archive file.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    A memory mapped ZIP archive is unmapped, allocated memory is
 *    released.
 *
 *-------------------------------------------------------------------------
 */

static void
ZipFSCloseArchive(Tcl_Interp *interp, ZipFile *zf)
{
#if defined(_WIN32) || defined(_WIN64)
    if ((zf->data != NULL) && (zf->tofree == NULL)) {
        UnmapViewOfFile(zf->data);
        zf->data = NULL;
    }
    if (zf->mh != INVALID_HANDLE_VALUE) {
        CloseHandle(zf->mh);
    }
#else
    if ((zf->data != MAP_FAILED) && (zf->tofree == NULL)) {
        munmap(zf->data, zf->length);
        zf->data = MAP_FAILED;
    }
#endif
    if (zf->tofree != NULL) {
        Tcl_Free((char *) zf->tofree);
        zf->tofree = NULL;
    }
    if(zf->chan != NULL) {
        Tcl_Close(interp, zf->chan);
        zf->chan = NULL;
    }
}

/*
 *-------------------------------------------------------------------------
 *
 * ZipFSOpenArchive --
 *
 *    This function opens a ZIP archive file for reading. An attempt
 *    is made to memory map that file. Otherwise it is read into
 *    an allocated memory buffer. The ZIP archive header is verified
 *    and must be valid for the function to succeed. When "needZip"
 *    is zero an embedded ZIP archive in an executable file is accepted.
 *
 * Results:
 *    TCL_OK on success, TCL_ERROR otherwise with an error message
 *    placed into the given "interp" if it is not NULL.
 *
 * Side effects:
 *    ZIP archive is memory mapped or read into allocated memory,
 *    the given ZipFile struct is filled with information about
 *    the ZIP archive file.
 *
 *-------------------------------------------------------------------------
 */

static int
ZipFSOpenArchive(Tcl_Interp *interp, const char *zipname, int needZip,
         ZipFile *zf)
{
    int i;
    ClientData handle;
    unsigned char *p, *q;

#if defined(_WIN32) || defined(_WIN64)
    zf->data = NULL;
    zf->mh = INVALID_HANDLE_VALUE;
#else
    zf->data = MAP_FAILED;
#endif
    zf->length = 0;
    zf->nfiles = 0;
    zf->baseoffs = zf->baseoffsp = 0;
    zf->tofree = NULL;
    zf->pwbuf[0] = 0;
    zf->chan = Tcl_OpenFileChannel(interp, zipname, "r", 0);
    if (zf->chan == NULL) {
        return TCL_ERROR;
    }
    if (Tcl_GetChannelHandle(zf->chan, TCL_READABLE, &handle) != TCL_OK) {
        if (Tcl_SetChannelOption(interp, zf->chan, "-translation", "binary") != TCL_OK) {
            goto error;
        }
        if (Tcl_SetChannelOption(interp, zf->chan, "-encoding", "binary") != TCL_OK) {
            goto error;
        }
        zf->length = Tcl_Seek(zf->chan, 0, SEEK_END);
        if ((zf->length <= 0) || (zf->length > 64 * 1024 * 1024)) {
            ZIPFS_ERROR(interp,"illegal file size");
            goto error;
        }
        Tcl_Seek(zf->chan, 0, SEEK_SET);
        zf->tofree = zf->data = (unsigned char *) Tcl_AttemptAlloc(zf->length);
        if (zf->tofree == NULL) {
            ZIPFS_ERROR(interp,"out of memory")
            goto error;
        }
        i = Tcl_Read(zf->chan, (char *) zf->data, zf->length);
        if (i != zf->length) {
            ZIPFS_ERROR(interp,"file read error");
            goto error;
        }
        Tcl_Close(interp, zf->chan);
        zf->chan = NULL;
    } else {
#if defined(_WIN32) || defined(_WIN64)
        zf->length = GetFileSize((HANDLE) handle, 0);
        if (
            (zf->length == INVALID_FILE_SIZE) ||
            (zf->length < ZIP_CENTRAL_END_LEN)
        ) {
            ZIPFS_ERROR(interp,"invalid file size");
            goto error;
        }
        zf->mh = CreateFileMapping((HANDLE) handle, 0, PAGE_READONLY, 0,
                       zf->length, 0);
        if (zf->mh == INVALID_HANDLE_VALUE) {
            ZIPFS_ERROR(interp,"file mapping failed");
            goto error;
        }
        zf->data = MapViewOfFile(zf->mh, FILE_MAP_READ, 0, 0, zf->length);
        if (zf->data == NULL) {
            ZIPFS_ERROR(interp,"file mapping failed");
            goto error;
        }
#else
        zf->length = lseek((int) (long) handle, 0, SEEK_END);
        if ((zf->length == -1) || (zf->length < ZIP_CENTRAL_END_LEN)) {
            ZIPFS_ERROR(interp,"invalid file size");
            goto error;
        }
        lseek((int) (long) handle, 0, SEEK_SET);
        zf->data = (unsigned char *) mmap(0, zf->length, PROT_READ,
                          MAP_FILE | MAP_PRIVATE,
                          (int) (long) handle, 0);
        if (zf->data == MAP_FAILED) {
            ZIPFS_ERROR(interp,"file mapping failed");
            goto error;
        }
#endif
    }
    p = zf->data + zf->length - ZIP_CENTRAL_END_LEN;
    while (p >= zf->data) {
        if (*p == (ZIP_CENTRAL_END_SIG & 0xFF)) {
            if (zip_read_int(p) == ZIP_CENTRAL_END_SIG) {
            break;
            }
            p -= ZIP_SIG_LEN;
        } else {
            --p;
        }
    }
    if (p < zf->data) {
        if (!needZip) {
            zf->baseoffs = zf->baseoffsp = zf->length;
            return TCL_OK;
        }
        ZIPFS_ERROR(interp,"wrong end signature");
        goto error;
    }
    zf->nfiles = zip_read_short(p + ZIP_CENTRAL_ENTS_OFFS);
    if (zf->nfiles == 0) {
        if (!needZip) {
            zf->baseoffs = zf->baseoffsp = zf->length;
            return TCL_OK;
        }
        ZIPFS_ERROR(interp,"empty archive");
        goto error;
    }
    q = zf->data + zip_read_int(p + ZIP_CENTRAL_DIRSTART_OFFS);
    p -= zip_read_int(p + ZIP_CENTRAL_DIRSIZE_OFFS);
    if (
        (p < zf->data) || (p > (zf->data + zf->length)) ||
        (q < zf->data) || (q > (zf->data + zf->length))
    ) {
        if (!needZip) {
            zf->baseoffs = zf->baseoffsp = zf->length;
            return TCL_OK;
        }
        ZIPFS_ERROR(interp,"archive directory not found");
        goto error;
    }
    zf->baseoffs = zf->baseoffsp = p - q;
    zf->centoffs = p - zf->data;
    q = p;
    for (i = 0; i < zf->nfiles; i++) {
        int pathlen, comlen, extra;

        if ((q + ZIP_CENTRAL_HEADER_LEN) > (zf->data + zf->length)) {
            ZIPFS_ERROR(interp,"wrong header length");
            goto error;
        }
        if (zip_read_int(q) != ZIP_CENTRAL_HEADER_SIG) {
            ZIPFS_ERROR(interp,"wrong header signature");
            goto error;
        }
        pathlen = zip_read_short(q + ZIP_CENTRAL_PATHLEN_OFFS);
        comlen = zip_read_short(q + ZIP_CENTRAL_FCOMMENTLEN_OFFS);
        extra = zip_read_short(q + ZIP_CENTRAL_EXTRALEN_OFFS);
        q += pathlen + comlen + extra + ZIP_CENTRAL_HEADER_LEN;
    }
    q = zf->data + zf->baseoffs;
    if ((zf->baseoffs >= 6) && (zip_read_int(q - 4) == ZIP_PASSWORD_END_SIG)) {
        i = q[-5];
        if (q - 5 - i > zf->data) {
            zf->pwbuf[0] = i;
            memcpy(zf->pwbuf + 1, q - 5 - i, i);
            zf->baseoffsp -= i ? (5 + i) : 0;
        }
    }
    return TCL_OK;

error:
    ZipFSCloseArchive(interp, zf);
    return TCL_ERROR;
}

/*
 *-------------------------------------------------------------------------
 *
 * TclZipfs_Mount --
 *
 *      This procedure is invoked to mount a given ZIP archive file on
 *    a given mountpoint with optional ZIP password.
 *
 * Results:
 *      A standard Tcl result.
 *
 * Side effects:
 *      A ZIP archive file is read, analyzed and mounted, resources are
 *    allocated.
 *
 *-------------------------------------------------------------------------
 */

int
TclZipfs_Mount(
    Tcl_Interp *interp, const char *zipname,
    const char *mntpt,
    const char *passwd
) {
    char *realname, *p;
    int i, pwlen, isNew;
    ZipFile *zf, zf0;
    ZipEntry *z;
    Tcl_HashEntry *hPtr;
    Tcl_DString ds, dsm, fpBuf;
    unsigned char *q;
#if HAS_DRIVES
    int drive = 0;
#endif

    ReadLock();
    if (!ZipFS.initialized) {
        ZIPFS_ERROR(interp,"not initialized");
        Unlock();
        return TCL_ERROR;
    }
    if (zipname == NULL) {
        Tcl_HashSearch search;
        int ret = TCL_OK;

        i = 0;
        hPtr = Tcl_FirstHashEntry(&ZipFS.zipHash, &search);
        while (hPtr != NULL) {
            if ((zf = (ZipFile *) Tcl_GetHashValue(hPtr)) != NULL) {
                if (interp != NULL) {
                    Tcl_AppendElement(interp, zf->mntpt);
                    Tcl_AppendElement(interp, zf->name);
                }
                ++i;
            }
            hPtr = Tcl_NextHashEntry(&search);
        }
        if (interp == NULL) {
            ret = (i > 0) ? TCL_OK : TCL_BREAK;
        }
        Unlock();
        return ret;
    }
    if (mntpt == NULL) {
        if (interp == NULL) {
            Unlock();
            return TCL_OK;
        }
        Tcl_DStringInit(&ds);
#if HAS_DRIVES
        p = AbsolutePath(zipname, &drive, &ds);
#else
        p = AbsolutePath(zipname, &ds);
#endif
        hPtr = Tcl_FindHashEntry(&ZipFS.zipHash, p);
        if (hPtr != NULL) {
#if HAS_DRIVES
                if (drive == zf->mntdrv) {
                    Tcl_Obj *string;
                    char drvbuf[3];

                    drvbuf[0] = zf->mntdrv;
                    drvbuf[1] = ':';
                    drvbuf[2] = '\0';
                    string = Tcl_NewStringObj(drvbuf, 2);
                    Tcl_AppendToObj(string, zf->mntpt, zf->mntptlen);
                    Tcl_SetObjResult(interp, string);
                }
#else
            if ((zf = Tcl_GetHashValue(hPtr)) != NULL) {
                Tcl_SetObjResult(interp,Tcl_NewStringObj(zf->mntpt, zf->mntptlen));
            }
#endif
        }
        Unlock();
        return TCL_OK;
    }
    Unlock();
    pwlen = 0;
    if (passwd != NULL) {
        pwlen = strlen(passwd);
        if ((pwlen > 255) || (strchr(passwd, 0xff) != NULL)) {
            if (interp) {
            Tcl_SetObjResult(interp,
                Tcl_NewStringObj("illegal password", -1));
            }
            return TCL_ERROR;
        }
    }
    if (ZipFSOpenArchive(interp, zipname, 1, &zf0) != TCL_OK) {
        return TCL_ERROR;
    }
    Tcl_DStringInit(&ds);
#if HAS_DRIVES
    realname = AbsolutePath(zipname, NULL, &ds);
#else
    realname = AbsolutePath(zipname, &ds);
#endif
    /*
     * Mount point sometimes is a relative or otherwise denormalized path.
     * But an absolute name is needed as mount point here.
     */
    Tcl_DStringInit(&dsm);
    mntpt = CanonicalPath("",mntpt, &dsm, 1);

    WriteLock();
    hPtr = Tcl_CreateHashEntry(&ZipFS.zipHash, zipname, &isNew);
    if (!isNew) {
        zf = (ZipFile *) Tcl_GetHashValue(hPtr);
        if (interp != NULL) {
            Tcl_AppendResult(interp, "already mounted on \"", zf->mntptlen ?
                zf->mntpt : "/", "\"", (char *) NULL);
        }
        Unlock();
        ZipFSCloseArchive(interp, &zf0);
        return TCL_ERROR;
    }
    if (strcmp(mntpt, "/") == 0) {
        mntpt = "";
    }
    zf = (ZipFile *) Tcl_AttemptAlloc(sizeof (*zf) + strlen(mntpt) + 1);
    if (zf == NULL) {
        if (interp != NULL) {
            Tcl_AppendResult(interp, "out of memory", (char *) NULL);
        }
        Unlock();
        ZipFSCloseArchive(interp, &zf0);
        return TCL_ERROR;
        }
        *zf = zf0;
        zf->name = Tcl_GetHashKey(&ZipFS.zipHash, hPtr);
        strcpy(zf->mntpt, mntpt);
        zf->mntptlen = strlen(zf->mntpt);
        zf->entries = NULL;
        zf->topents = NULL;
        zf->nopen = 0;
        Tcl_SetHashValue(hPtr, (ClientData) zf);
        if ((zf->pwbuf[0] == 0) && pwlen) {
        int k = 0;
        i = pwlen;
        zf->pwbuf[k++] = i;
        while (i > 0) {
            zf->pwbuf[k] = (passwd[i - 1] & 0x0f) |
            pwrot[(passwd[i - 1] >> 4) & 0x0f];
            k++;
            i--;
        }
        zf->pwbuf[k] = '\0';
    }
    if (mntpt[0] != '\0') {
        z = (ZipEntry *) Tcl_Alloc(sizeof (*z));
        z->name = NULL;
        z->tnext = NULL;
        z->depth = CountSlashes(mntpt);
        z->zipfile = zf;
        z->isdir = (zf->baseoffs == 0) ? 1 : -1; /* root marker */
        z->isenc = 0;
        z->offset = zf->baseoffs;
        z->crc32 = 0;
        z->timestamp = 0;
        z->nbyte = z->nbytecompr = 0;
        z->cmeth = ZIP_COMPMETH_STORED;
        z->data = NULL;
        hPtr = Tcl_CreateHashEntry(&ZipFS.fileHash, mntpt, &isNew);
        if (!isNew) {
            /* skip it */
            Tcl_Free((char *) z);
        } else {
            Tcl_SetHashValue(hPtr, (ClientData) z);
            z->name = Tcl_GetHashKey(&ZipFS.fileHash, hPtr);
            z->next = zf->entries;
            zf->entries = z;
        }
    }
    q = zf->data + zf->centoffs;
    Tcl_DStringInit(&fpBuf);
    Tcl_DStringInit(&ds);
    for (i = 0; i < zf->nfiles; i++) {
        int pathlen, comlen, extra, isdir = 0, dosTime, dosDate, nbcompr, offs;
        unsigned char *lq, *gq = NULL;
        char *fullpath, *path;

        pathlen = zip_read_short(q + ZIP_CENTRAL_PATHLEN_OFFS);
        comlen = zip_read_short(q + ZIP_CENTRAL_FCOMMENTLEN_OFFS);
        extra = zip_read_short(q + ZIP_CENTRAL_EXTRALEN_OFFS);
        Tcl_DStringSetLength(&ds, 0);
        Tcl_DStringAppend(&ds, (char *) q + ZIP_CENTRAL_HEADER_LEN, pathlen);
        path = Tcl_DStringValue(&ds);
        if ((pathlen > 0) && (path[pathlen - 1] == '/')) {
            Tcl_DStringSetLength(&ds, pathlen - 1);
            path = Tcl_DStringValue(&ds);
            isdir = 1;
        }
        if ((strcmp(path, ".") == 0) || (strcmp(path, "..") == 0)) {
            goto nextent;
        }
        lq = zf->data + zf->baseoffs + zip_read_int(q + ZIP_CENTRAL_LOCALHDR_OFFS);
        if ((lq < zf->data) || (lq > (zf->data + zf->length))) {
            goto nextent;
        }
        nbcompr = zip_read_int(lq + ZIP_LOCAL_COMPLEN_OFFS);
        if (
            !isdir && (nbcompr == 0)
            && (zip_read_int(lq + ZIP_LOCAL_UNCOMPLEN_OFFS) == 0)
            && (zip_read_int(lq + ZIP_LOCAL_CRC32_OFFS) == 0)
        ) {
            gq = q;
            nbcompr = zip_read_int(gq + ZIP_CENTRAL_COMPLEN_OFFS);
        }
        offs = (lq - zf->data)
            + ZIP_LOCAL_HEADER_LEN
            + zip_read_short(lq + ZIP_LOCAL_PATHLEN_OFFS)
            + zip_read_short(lq + ZIP_LOCAL_EXTRALEN_OFFS);
        if ((offs + nbcompr) > zf->length) {
            goto nextent;
        }
        if (!isdir && (mntpt[0] == '\0') && !CountSlashes(path)) {
#ifdef ANDROID
            /*
             * When mounting the ZIP archive on the root directory try
             * to remap top level regular files of the archive to
             * /assets/.root/... since this directory should not be
             * in a valid APK due to the leading dot in the file name
             * component. This trick should make the files
             * AndroidManifest.xml, resources.arsc, and classes.dex
             * visible to Tcl.
             */
            Tcl_DString ds2;

            Tcl_DStringInit(&ds2);
            Tcl_DStringAppend(&ds2, "assets/.root/", -1);
            Tcl_DStringAppend(&ds2, path, -1);
            hPtr = Tcl_FindHashEntry(&ZipFS.fileHash, Tcl_DStringValue(&ds2));
            if (hPtr != NULL) {
                /* should not happen but skip it anyway */
                Tcl_DStringFree(&ds2);
                goto nextent;
            }
            Tcl_DStringSetLength(&ds, 0);
            Tcl_DStringAppend(&ds, Tcl_DStringValue(&ds2), Tcl_DStringLength(&ds2));
            path = Tcl_DStringValue(&ds);
            Tcl_DStringFree(&ds2);
#else
            /*
             * Regular files skipped when mounting on root.
             */
            goto nextent;
#endif
        }
        Tcl_DStringSetLength(&fpBuf, 0);
        fullpath = CanonicalPath(mntpt, path, &fpBuf, 1);
        z = (ZipEntry *) Tcl_Alloc(sizeof (*z));
        z->name = NULL;
        z->tnext = NULL;
        z->depth = CountSlashes(fullpath);
        z->zipfile = zf;
        z->isdir = isdir;
        z->isenc = (zip_read_short(lq + ZIP_LOCAL_FLAGS_OFFS) & 1) && (nbcompr > 12);
        z->offset = offs;
        if (gq != NULL) {
            z->crc32 = zip_read_int(gq + ZIP_CENTRAL_CRC32_OFFS);
            dosDate = zip_read_short(gq + ZIP_CENTRAL_MDATE_OFFS);
            dosTime = zip_read_short(gq + ZIP_CENTRAL_MTIME_OFFS);
            z->timestamp = DosTimeDate(dosDate, dosTime);
            z->nbyte = zip_read_int(gq + ZIP_CENTRAL_UNCOMPLEN_OFFS);
            z->cmeth = zip_read_short(gq + ZIP_CENTRAL_COMPMETH_OFFS);
        } else {
            z->crc32 = zip_read_int(lq + ZIP_LOCAL_CRC32_OFFS);
            dosDate = zip_read_short(lq + ZIP_LOCAL_MDATE_OFFS);
            dosTime = zip_read_short(lq + ZIP_LOCAL_MTIME_OFFS);
            z->timestamp = DosTimeDate(dosDate, dosTime);
            z->nbyte = zip_read_int(lq + ZIP_LOCAL_UNCOMPLEN_OFFS);
            z->cmeth = zip_read_short(lq + ZIP_LOCAL_COMPMETH_OFFS);
        }
        z->nbytecompr = nbcompr;
        z->data = NULL;
        hPtr = Tcl_CreateHashEntry(&ZipFS.fileHash, fullpath, &isNew);
        if (!isNew) {
            /* should not happen but skip it anyway */
            Tcl_Free((char *) z);
        } else {
            Tcl_SetHashValue(hPtr, (ClientData) z);
            z->name = Tcl_GetHashKey(&ZipFS.fileHash, hPtr);
            z->next = zf->entries;
            zf->entries = z;
            if (isdir && (mntpt[0] == '\0') && (z->depth == 1)) {
                z->tnext = zf->topents;
                zf->topents = z;
            }
            if (!z->isdir && (z->depth > 1)) {
                char *dir, *end;
                ZipEntry *zd;

                Tcl_DStringSetLength(&ds, strlen(z->name) + 8);
                Tcl_DStringSetLength(&ds, 0);
                Tcl_DStringAppend(&ds, z->name, -1);
                dir = Tcl_DStringValue(&ds);
                end = strrchr(dir, '/');
                while ((end != NULL) && (end != dir)) {
                    Tcl_DStringSetLength(&ds, end - dir);
                    hPtr = Tcl_FindHashEntry(&ZipFS.fileHash, dir);
                    if (hPtr != NULL) {
                        break;
                    }
                    zd = (ZipEntry *) Tcl_Alloc(sizeof (*zd));
                    zd->name = NULL;
                    zd->tnext = NULL;
                    zd->depth = CountSlashes(dir);
                    zd->zipfile = zf;
                    zd->isdir = 1;
                    zd->isenc = 0;
                    zd->offset = z->offset;
                    zd->crc32 = 0;
                    zd->timestamp = z->timestamp;
                    zd->nbyte = zd->nbytecompr = 0;
                    zd->cmeth = ZIP_COMPMETH_STORED;
                    zd->data = NULL;
                    hPtr = Tcl_CreateHashEntry(&ZipFS.fileHash, dir, &isNew);
                    if (!isNew) {
                        /* should not happen but skip it anyway */
                        Tcl_Free((char *) zd);
                    } else {
                        Tcl_SetHashValue(hPtr, (ClientData) zd);
                        zd->name = Tcl_GetHashKey(&ZipFS.fileHash, hPtr);
                        zd->next = zf->entries;
                        zf->entries = zd;
                        if ((mntpt[0] == '\0') && (zd->depth == 1)) {
                            zd->tnext = zf->topents;
                            zf->topents = zd;
                        }
                    }
                    end = strrchr(dir, '/');
                }
            }
        }
nextent:
        q += pathlen + comlen + extra + ZIP_CENTRAL_HEADER_LEN;
    }
    Unlock();
    Tcl_DStringFree(&fpBuf);
    Tcl_DStringFree(&ds);
    Tcl_FSMountsChanged(NULL);
    return TCL_OK;
}

/*
 *-------------------------------------------------------------------------
 *
 * TclZipfs_Unmount --
 *
 *      This procedure is invoked to unmount a given ZIP archive.
 *
 * Results:
 *      A standard Tcl result.
 *
 * Side effects:
 *      A mounted ZIP archive file is unmounted, resources are free'd.
 *
 *-------------------------------------------------------------------------
 */

int
TclZipfs_Unmount(Tcl_Interp *interp, const char *zipname)
{
    ZipFile *zf;
    ZipEntry *z, *znext;
    Tcl_HashEntry *hPtr;
    int ret = TCL_OK, unmounted = 0;

    WriteLock();
    if (!ZipFS.initialized) goto done;

    hPtr = Tcl_FindHashEntry(&ZipFS.zipHash, zipname);

    /* don't report error */
    if (hPtr == NULL) goto done;

    zf = (ZipFile *) Tcl_GetHashValue(hPtr);
    if (zf->nopen > 0) {
        ZIPFS_ERROR(interp,"filesystem is busy");
        ret = TCL_ERROR;
        goto done;
    }
    Tcl_DeleteHashEntry(hPtr);
    for (z = zf->entries; z; z = znext) {
        znext = z->next;
        hPtr = Tcl_FindHashEntry(&ZipFS.fileHash, z->name);
        if (hPtr) {
            Tcl_DeleteHashEntry(hPtr);
        }
        if (z->data != NULL) {
            Tcl_Free((char *) z->data);
        }
        Tcl_Free((char *) z);
    }
    ZipFSCloseArchive(interp, zf);
    Tcl_Free((char *) zf);
    unmounted = 1;
done:
    Unlock();
    if (unmounted) {
        Tcl_FSMountsChanged(NULL);
    }
    return ret;
}

/*
 *-------------------------------------------------------------------------
 *
 * ZipFSMountObjCmd --
 *
 *      This procedure is invoked to process the "zipfs::mount" command.
 *
 * Results:
 *      A standard Tcl result.
 *
 * Side effects:
 *      A ZIP archive file is mounted, resources are allocated.
 *
 *-------------------------------------------------------------------------
 */

static int
ZipFSMountObjCmd(
    ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]
) {
    if (objc > 4) {
        Tcl_WrongNumArgs(interp, 1, objv,
                 "?zipfile? ?mountpoint? ?password?");
        return TCL_ERROR;
    }
    return TclZipfs_Mount(interp, (objc > 1) ? Tcl_GetString(objv[1]) : NULL,
               (objc > 2) ? Tcl_GetString(objv[2]) : NULL,
               (objc > 3) ? Tcl_GetString(objv[3]) : NULL);
}

/*
 *-------------------------------------------------------------------------
 *
 * ZipFSRootObjCmd --
 *
 *      This procedure is invoked to process the "zipfs::root" command. It
 *      returns the root that all zipfs file systems are mounted under.
 *
 * Results:
 *      A standard Tcl result.
 *
 * Side effects:
 *
 *-------------------------------------------------------------------------
 */

static int
ZipFSRootObjCmd(
    ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]
) {
    Tcl_SetObjResult(interp,Tcl_NewStringObj(ZIPFS_VOLUME, -1));
    return TCL_OK;
}

/*
 *-------------------------------------------------------------------------
 *
 * ZipFSUnmountObjCmd --
 *
 *      This procedure is invoked to process the "zipfs::unmount" command.
 *
 * Results:
 *      A standard Tcl result.
 *
 * Side effects:
 *      A mounted ZIP archive file is unmounted, resources are free'd.
 *
 *-------------------------------------------------------------------------
 */

static int
ZipFSUnmountObjCmd(
    ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]
) {
    if (objc != 2) {
        Tcl_WrongNumArgs(interp, 1, objv, "zipfile");
        return TCL_ERROR;
    }
    return TclZipfs_Unmount(interp, Tcl_GetString(objv[1]));
}

/*
 *-------------------------------------------------------------------------
 *
 * ZipFSMkKeyObjCmd --
 *
 *      This procedure is invoked to process the "zipfs::mkkey" command.
 *    It produces a rotated password to be embedded into an image file.
 *
 * Results:
 *      A standard Tcl result.
 *
 * Side effects:
 *      None.
 *
 *-------------------------------------------------------------------------
 */

static int
ZipFSMkKeyObjCmd(
    ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]
) {
    int len, i = 0;
    char *pw, pwbuf[264];

    if (objc != 2) {
    Tcl_WrongNumArgs(interp, 1, objv, "password");
        return TCL_ERROR;
    }
    pw = Tcl_GetString(objv[1]);
    len = strlen(pw);
    if (len == 0) {
        return TCL_OK;
    }
    if ((len > 255) || (strchr(pw, 0xff) != NULL)) {
        Tcl_SetObjResult(interp, Tcl_NewStringObj("illegal password", -1));
        return TCL_ERROR;
    }
    while (len > 0) {
        int ch = pw[len - 1];

        pwbuf[i] = (ch & 0x0f) | pwrot[(ch >> 4) & 0x0f];
        i++;
        len--;
    }
    pwbuf[i] = i;
    ++i;
    pwbuf[i++] = (char) ZIP_PASSWORD_END_SIG;
    pwbuf[i++] = (char) (ZIP_PASSWORD_END_SIG >> 8);
    pwbuf[i++] = (char) (ZIP_PASSWORD_END_SIG >> 16);
    pwbuf[i++] = (char) (ZIP_PASSWORD_END_SIG >> 24);
    pwbuf[i] = '\0';
    Tcl_AppendResult(interp, pwbuf, (char *) NULL);
    return TCL_OK;
}

/*
 *-------------------------------------------------------------------------
 *
 * ZipAddFile --
 *
 *      This procedure is used by ZipFSMkZipOrImgCmd() to add a single
 *    file to the output ZIP archive file being written. A ZipEntry
 *    struct about the input file is added to the given fileHash table
 *    for later creation of the central ZIP directory.
 *
 * Results:
 *      A standard Tcl result.
 *
 * Side effects:
 *    Input file is read and (compressed and) written to the output
 *    ZIP archive file.
 *
 *-------------------------------------------------------------------------
 */

static int
ZipAddFile(
    Tcl_Interp *interp, const char *path, const char *name,
    Tcl_Channel out, const char *passwd,
    char *buf, int bufsize, Tcl_HashTable *fileHash
) {
    Tcl_Channel in;
    Tcl_HashEntry *hPtr;
    ZipEntry *z;
    z_stream stream;
    const char *zpath;
    int nbyte, nbytecompr, len, crc, flush, pos[3], zpathlen, olen;
    int mtime = 0, isNew, align = 0, cmeth;
    unsigned long keys[3], keys0[3];
    char obuf[4096];

    zpath = name;
    while (zpath != NULL && zpath[0] == '/') {
        zpath++;
    }
    if ((zpath == NULL) || (zpath[0] == '\0')) {
        return TCL_OK;
    }
    zpathlen = strlen(zpath);
    if (zpathlen + ZIP_CENTRAL_HEADER_LEN > bufsize) {
        Tcl_AppendResult(interp, "path too long for \"", path, "\"", (char *) NULL);
        return TCL_ERROR;
    }
    in = Tcl_OpenFileChannel(interp, path, "r", 0);
    if (
        (in == NULL)
        || (Tcl_SetChannelOption(interp, in, "-translation", "binary") != TCL_OK)
        || (Tcl_SetChannelOption(interp, in, "-encoding", "binary") != TCL_OK)
    ) {
#if defined(_WIN32) || defined(_WIN64)
         /* hopefully a directory */
         if (strcmp("permission denied", Tcl_PosixError(interp)) == 0) {
            Tcl_Close(interp, in);
            return TCL_OK;
        }
#endif
        Tcl_Close(interp, in);
        return TCL_ERROR;
    } else {
        Tcl_Obj *pathObj = Tcl_NewStringObj(path, -1);
        Tcl_StatBuf statBuf;

        Tcl_IncrRefCount(pathObj);
        if (Tcl_FSStat(pathObj, &statBuf) != -1) {
            mtime = statBuf.st_mtime;
        }
        Tcl_DecrRefCount(pathObj);
    }
    Tcl_ResetResult(interp);
    crc = 0;
    nbyte = nbytecompr = 0;
    while ((len = Tcl_Read(in, buf, bufsize)) > 0) {
        crc = crc32(crc, (unsigned char *) buf, len);
        nbyte += len;
    }
    if (len == -1) {
        if (nbyte == 0) {
            if (strcmp("illegal operation on a directory",
                   Tcl_PosixError(interp)) == 0) {
            Tcl_Close(interp, in);
            return TCL_OK;
            }
        }
        Tcl_AppendResult(interp, "read error on \"", path, "\"",
                 (char *) NULL);
        Tcl_Close(interp, in);
        return TCL_ERROR;
    }
    if (Tcl_Seek(in, 0, SEEK_SET) == -1) {
        Tcl_AppendResult(interp, "seek error on \"", path, "\"",
                 (char *) NULL);
        Tcl_Close(interp, in);
        return TCL_ERROR;
    }
    pos[0] = Tcl_Tell(out);
    memset(buf, '\0', ZIP_LOCAL_HEADER_LEN);
    memcpy(buf + ZIP_LOCAL_HEADER_LEN, zpath, zpathlen);
    len = zpathlen + ZIP_LOCAL_HEADER_LEN;
    if (Tcl_Write(out, buf, len) != len) {
wrerr:
    Tcl_AppendResult(interp, "write error", (char *) NULL);
    Tcl_Close(interp, in);
    return TCL_ERROR;
    }
    if ((len + pos[0]) & 3) {
        char abuf[8];

        /*
         * Align payload to next 4-byte boundary using a dummy extra
         * entry similar to the zipalign tool from Android's SDK.
         */
        align = 4 + ((len + pos[0]) & 3);
        zip_write_short(abuf, 0xffff);
        zip_write_short(abuf + 2, align - 4);
        zip_write_int(abuf + 4, 0x03020100);
        if (Tcl_Write(out, abuf, align) != align) {
            goto wrerr;
        }
    }
    if (passwd != NULL) {
        int i, ch, tmp;
        unsigned char kvbuf[24];
        Tcl_Obj *ret;

        init_keys(passwd, keys, crc32tab);
        for (i = 0; i < 12 - 2; i++) {
            if (Tcl_EvalEx(interp, "expr int(rand() * 256) % 256", -1, 0) != TCL_OK) {
                Tcl_AppendResult(interp, "PRNG error", (char *) NULL);
                Tcl_Close(interp, in);
                return TCL_ERROR;
            }
            ret = Tcl_GetObjResult(interp);
            if (Tcl_GetIntFromObj(interp, ret, &ch) != TCL_OK) {
                Tcl_Close(interp, in);
                return TCL_ERROR;
            }
            kvbuf[i + 12] = (unsigned char) zencode(keys, crc32tab, ch, tmp);
        }
        Tcl_ResetResult(interp);
        init_keys(passwd, keys, crc32tab);
        for (i = 0; i < 12 - 2; i++) {
            kvbuf[i] = (unsigned char) zencode(keys, crc32tab, kvbuf[i + 12], tmp);
        }
        kvbuf[i++] = (unsigned char) zencode(keys, crc32tab, crc >> 16, tmp);
        kvbuf[i++] = (unsigned char) zencode(keys, crc32tab, crc >> 24, tmp);
        len = Tcl_Write(out, (char *) kvbuf, 12);
        memset(kvbuf, 0, 24);
        if (len != 12) {
            Tcl_AppendResult(interp, "write error", (char *) NULL);
            Tcl_Close(interp, in);
            return TCL_ERROR;
        }
        memcpy(keys0, keys, sizeof (keys0));
        nbytecompr += 12;
    }
    Tcl_Flush(out);
    pos[2] = Tcl_Tell(out);
    cmeth = ZIP_COMPMETH_DEFLATED;
    memset(&stream, 0, sizeof (stream));
    stream.zalloc = Z_NULL;
    stream.zfree = Z_NULL;
    stream.opaque = Z_NULL;
    if (deflateInit2(&stream, 9, Z_DEFLATED, -15, 8, Z_DEFAULT_STRATEGY) != Z_OK) {
        Tcl_AppendResult(interp, "compression init error on \"", path, "\"",
                 (char *) NULL);
        Tcl_Close(interp, in);
        return TCL_ERROR;
    }
    do {
    len = Tcl_Read(in, buf, bufsize);
    if (len == -1) {
        Tcl_AppendResult(interp, "read error on \"", path, "\"",
                 (char *) NULL);
        deflateEnd(&stream);
        Tcl_Close(interp, in);
        return TCL_ERROR;
    }
    stream.avail_in = len;
    stream.next_in = (unsigned char *) buf;
    flush = Tcl_Eof(in) ? Z_FINISH : Z_NO_FLUSH;
    do {
        stream.avail_out = sizeof (obuf);
        stream.next_out = (unsigned char *) obuf;
        len = deflate(&stream, flush);
        if (len == Z_STREAM_ERROR) {
            Tcl_AppendResult(interp, "deflate error on \"", path, "\"",
                     (char *) NULL);
            deflateEnd(&stream);
            Tcl_Close(interp, in);
            return TCL_ERROR;
        }
        olen = sizeof (obuf) - stream.avail_out;
        if (passwd != NULL) {
            int i, tmp;

            for (i = 0; i < olen; i++) {
                obuf[i] = (char) zencode(keys, crc32tab, obuf[i], tmp);
            }
        }
        if (olen && (Tcl_Write(out, obuf, olen) != olen)) {
            Tcl_AppendResult(interp, "write error", (char *) NULL);
            deflateEnd(&stream);
            Tcl_Close(interp, in);
            return TCL_ERROR;
        }
        nbytecompr += olen;
    } while (stream.avail_out == 0);
    } while (flush != Z_FINISH);
    deflateEnd(&stream);
    Tcl_Flush(out);
    pos[1] = Tcl_Tell(out);
    if (nbyte - nbytecompr <= 0) {
        /*
         * Compressed file larger than input,
         * write it again uncompressed.
         */
        if ((int) Tcl_Seek(in, 0, SEEK_SET) != 0) {
            goto seekErr;
        }
        if ((int) Tcl_Seek(out, pos[2], SEEK_SET) != pos[2]) {
seekErr:
            Tcl_Close(interp, in);
            Tcl_AppendResult(interp, "seek error", (char *) NULL);
            return TCL_ERROR;
        }
        nbytecompr = (passwd != NULL) ? 12 : 0;
        while (1) {
            len = Tcl_Read(in, buf, bufsize);
            if (len == -1) {
            Tcl_AppendResult(interp, "read error on \"", path, "\"",
                     (char *) NULL);
            Tcl_Close(interp, in);
            return TCL_ERROR;
            } else if (len == 0) {
            break;
            }
            if (passwd != NULL) {
            int i, tmp;

            for (i = 0; i < len; i++) {
                buf[i] = (char) zencode(keys0, crc32tab, buf[i], tmp);
            }
            }
            if (Tcl_Write(out, buf, len) != len) {
            Tcl_AppendResult(interp, "write error", (char *) NULL);
            Tcl_Close(interp, in);
            return TCL_ERROR;
            }
            nbytecompr += len;
        }
        cmeth = ZIP_COMPMETH_STORED;
        Tcl_Flush(out);
        pos[1] = Tcl_Tell(out);
        Tcl_TruncateChannel(out, pos[1]);
    }
    Tcl_Close(interp, in);

    z = (ZipEntry *) Tcl_Alloc(sizeof (*z));
    z->name = NULL;
    z->tnext = NULL;
    z->depth = 0;
    z->zipfile = NULL;
    z->isdir = 0;
    z->isenc = (passwd != NULL) ? 1 : 0;
    z->offset = pos[0];
    z->crc32 = crc;
    z->timestamp = mtime;
    z->nbyte = nbyte;
    z->nbytecompr = nbytecompr;
    z->cmeth = cmeth;
    z->data = NULL;
    hPtr = Tcl_CreateHashEntry(fileHash, zpath, &isNew);
    if (!isNew) {
        Tcl_AppendResult(interp, "non-unique path name \"", path, "\"",
                 (char *) NULL);
        Tcl_Free((char *) z);
        return TCL_ERROR;
    } else {
        Tcl_SetHashValue(hPtr, (ClientData) z);
        z->name = Tcl_GetHashKey(fileHash, hPtr);
        z->next = NULL;
    }

    /*
     * Write final local header information.
     */
    zip_write_int(buf + ZIP_LOCAL_SIG_OFFS, ZIP_LOCAL_HEADER_SIG);
    zip_write_short(buf + ZIP_LOCAL_VERSION_OFFS, ZIP_MIN_VERSION);
    zip_write_short(buf + ZIP_LOCAL_FLAGS_OFFS, z->isenc);
    zip_write_short(buf + ZIP_LOCAL_COMPMETH_OFFS, z->cmeth);
    zip_write_short(buf + ZIP_LOCAL_MTIME_OFFS, ToDosTime(z->timestamp));
    zip_write_short(buf + ZIP_LOCAL_MDATE_OFFS, ToDosDate(z->timestamp));
    zip_write_int(buf + ZIP_LOCAL_CRC32_OFFS, z->crc32);
    zip_write_int(buf + ZIP_LOCAL_COMPLEN_OFFS, z->nbytecompr);
    zip_write_int(buf + ZIP_LOCAL_UNCOMPLEN_OFFS, z->nbyte);
    zip_write_short(buf + ZIP_LOCAL_PATHLEN_OFFS, zpathlen);
    zip_write_short(buf + ZIP_LOCAL_EXTRALEN_OFFS, align);
    if ((int) Tcl_Seek(out, pos[0], SEEK_SET) != pos[0]) {
        Tcl_DeleteHashEntry(hPtr);
        Tcl_Free((char *) z);
        Tcl_AppendResult(interp, "seek error", (char *) NULL);
        return TCL_ERROR;
    }
    if (Tcl_Write(out, buf, ZIP_LOCAL_HEADER_LEN) != ZIP_LOCAL_HEADER_LEN) {
        Tcl_DeleteHashEntry(hPtr);
        Tcl_Free((char *) z);
        Tcl_AppendResult(interp, "write error", (char *) NULL);
        return TCL_ERROR;
    }
    Tcl_Flush(out);
    if ((int) Tcl_Seek(out, pos[1], SEEK_SET) != pos[1]) {
        Tcl_DeleteHashEntry(hPtr);
        Tcl_Free((char *) z);
        Tcl_AppendResult(interp, "seek error", (char *) NULL);
        return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *-------------------------------------------------------------------------
 *
 * ZipFSMkZipOrImgObjCmd --
 *
 *      This procedure is creates a new ZIP archive file or image file
 *        given output filename, input directory of files to be archived,
 *        optional password, and optional image to be prepended to the
 *        output ZIP archive file.
 *
 * Results:
 *      A standard Tcl result.
 *
 * Side effects:
 *        A new ZIP archive file or image file is written.
 *
 *-------------------------------------------------------------------------
 */

static int
ZipFSMkZipOrImgObjCmd(ClientData clientData, Tcl_Interp *interp,
                      int isImg, int isList, int objc, Tcl_Obj *const objv[])
{
    Tcl_Channel out;
    int len = 0, pwlen = 0, slen = 0, i, count, ret = TCL_ERROR, lobjc, pos[3];
    Tcl_Obj **lobjv, *list = NULL;
    ZipEntry *z;
    Tcl_HashEntry *hPtr;
    Tcl_HashSearch search;
    Tcl_HashTable fileHash;
    char *strip = NULL, *pw = NULL, pwbuf[264], buf[4096];

    if (isList) {
        if ((objc < 3) || (objc > (isImg ? 5 : 4))) {
            Tcl_WrongNumArgs(interp, 1, objv, isImg ?
                             "outfile inlist ?password infile?" :
                             "outfile inlist ?password?");
            return TCL_ERROR;
        }
    } else {
        if ((objc < 3) || (objc > (isImg ? 6 : 5))) {
            Tcl_WrongNumArgs(interp, 1, objv, isImg ?
                             "outfile indir ?strip? ?password? ?infile?" :
                             "outfile indir ?strip? ?password?");
            return TCL_ERROR;
        }
    }
    pwbuf[0] = 0;
    if (objc > (isList ? 3 : 4)) {
        pw = Tcl_GetString(objv[isList ? 3 : 4]);
        pwlen = strlen(pw);
        if ((pwlen > 255) || (strchr(pw, 0xff) != NULL)) {
            Tcl_SetObjResult(interp,
                             Tcl_NewStringObj("illegal password", -1));
            return TCL_ERROR;
        }
    }
    if (isList) {
        list = objv[2];
        Tcl_IncrRefCount(list);
    } else {
        Tcl_Obj *cmd[3];

        cmd[1] = Tcl_NewStringObj("::tcl::zipfs::find", -1);
        cmd[2] = objv[2];
        cmd[0] = Tcl_NewListObj(2, cmd + 1);
        Tcl_IncrRefCount(cmd[0]);
        if (Tcl_EvalObjEx(interp, cmd[0], TCL_EVAL_DIRECT) != TCL_OK) {
            Tcl_DecrRefCount(cmd[0]);
            return TCL_ERROR;
        }
        Tcl_DecrRefCount(cmd[0]);
        list = Tcl_GetObjResult(interp);
        Tcl_IncrRefCount(list);
    }
    if (Tcl_ListObjGetElements(interp, list, &lobjc, &lobjv) != TCL_OK) {
        Tcl_DecrRefCount(list);
        return TCL_ERROR;
    }
    if (isList && (lobjc % 2)) {
        Tcl_DecrRefCount(list);
        Tcl_SetObjResult(interp,
                Tcl_NewStringObj("need even number of elements", -1));
        return TCL_ERROR;
    }
    if (lobjc == 0) {
        Tcl_DecrRefCount(list);
        Tcl_SetObjResult(interp, Tcl_NewStringObj("empty archive", -1));
        return TCL_ERROR;
    }
    out = Tcl_OpenFileChannel(interp, Tcl_GetString(objv[1]), "w", 0755);
    if (
        (out == NULL)
        || (Tcl_SetChannelOption(interp, out, "-translation", "binary") != TCL_OK)
        || (Tcl_SetChannelOption(interp, out, "-encoding", "binary") != TCL_OK)
    ) {
        Tcl_DecrRefCount(list);
        Tcl_Close(interp, out);
        return TCL_ERROR;
    }
    if (pwlen <= 0) {
        pw = NULL;
        pwlen = 0;
    }
    if (isImg) {
        ZipFile *zf, zf0;
        int isMounted = 0;
        const char *imgName;

        if (isList) {
            imgName = (objc > 4) ? Tcl_GetString(objv[4]) : Tcl_GetNameOfExecutable();
        } else {
            imgName = (objc > 5) ? Tcl_GetString(objv[5]) : Tcl_GetNameOfExecutable();
        }
        if (pwlen) {
            i = 0;
            len = pwlen;
            while (len > 0) {
                int ch = pw[len - 1];

                pwbuf[i] = (ch & 0x0f) | pwrot[(ch >> 4) & 0x0f];
                i++;
                len--;
            }
            pwbuf[i] = i;
            ++i;
            pwbuf[i++] = (char) ZIP_PASSWORD_END_SIG;
            pwbuf[i++] = (char) (ZIP_PASSWORD_END_SIG >> 8);
            pwbuf[i++] = (char) (ZIP_PASSWORD_END_SIG >> 16);
            pwbuf[i++] = (char) (ZIP_PASSWORD_END_SIG >> 24);
            pwbuf[i] = '\0';
        }
        /* Check for mounted image */
        WriteLock();
        hPtr = Tcl_FirstHashEntry(&ZipFS.zipHash, &search);
        while (hPtr != NULL) {
            if ((zf = (ZipFile *) Tcl_GetHashValue(hPtr)) != NULL) {
                if (strcmp(zf->name, imgName) == 0) {
                    isMounted = 1;
                    zf->nopen++;
                    break;
                }
            }
            hPtr = Tcl_NextHashEntry(&search);
        }
        Unlock();
        if (!isMounted) {
            zf = &zf0;
        }
        if (isMounted ||
            (ZipFSOpenArchive(interp, imgName, 0, zf) == TCL_OK)) {
            i = Tcl_Write(out, (char *) zf->data, zf->baseoffsp);
            if (i != zf->baseoffsp) {
                memset(pwbuf, 0, sizeof (pwbuf));
                Tcl_DecrRefCount(list);
                Tcl_SetObjResult(interp, Tcl_NewStringObj("write error", -1));
                Tcl_Close(interp, out);
                if (zf == &zf0) {
                    ZipFSCloseArchive(interp, zf);
                } else {
                    WriteLock();
                    zf->nopen--;
                    Unlock();
                }
                return TCL_ERROR;
            }
            if (zf == &zf0) {
                ZipFSCloseArchive(interp, zf);
            } else {
                WriteLock();
                zf->nopen--;
                Unlock();
            }
        } else {
            int k, n, m;
            Tcl_Channel in;
            const char *errMsg = "seek error";

            /*
             * Fall back to read it as plain file which
             * hopefully is a static tclsh or wish binary
             * with proper zipfs infrastructure built in.
             */
            Tcl_ResetResult(interp);
            in = Tcl_OpenFileChannel(interp, imgName, "r", 0644);
            if (in == NULL) {
                memset(pwbuf, 0, sizeof (pwbuf));
                Tcl_DecrRefCount(list);
                Tcl_Close(interp, out);
                return TCL_ERROR;
            }
            Tcl_SetChannelOption(interp, in, "-translation", "binary");
            Tcl_SetChannelOption(interp, in, "-encoding", "binary");
            i = Tcl_Seek(in, 0, SEEK_END);
            if (i == -1) {
cperr:
                memset(pwbuf, 0, sizeof (pwbuf));
                Tcl_DecrRefCount(list);
                Tcl_SetObjResult(interp, Tcl_NewStringObj(errMsg, -1));
                Tcl_Close(interp, out);
                Tcl_Close(interp, in);
                return TCL_ERROR;
            }
            Tcl_Seek(in, 0, SEEK_SET);
            k = 0;
            while (k < i) {
                m = i - k;
                if (m > sizeof (buf)) {
                    m = sizeof (buf);
                }
                n = Tcl_Read(in, buf, m);
                if (n == -1) {
                    errMsg = "read error";
                    goto cperr;
                } else if (n == 0) {
                    break;
                }
                m = Tcl_Write(out, buf, n);
                if (m != n) {
                    errMsg = "write error";
                    goto cperr;
                }
                k += m;
            }
            Tcl_Close(interp, in);
        }
        len = strlen(pwbuf);
        if (len > 0) {
            i = Tcl_Write(out, pwbuf, len);
            if (i != len) {
                Tcl_DecrRefCount(list);
                Tcl_SetObjResult(interp, Tcl_NewStringObj("write error", -1));
                Tcl_Close(interp, out);
                return TCL_ERROR;
            }
        }
        memset(pwbuf, 0, sizeof (pwbuf));
        Tcl_Flush(out);
    }
    Tcl_InitHashTable(&fileHash, TCL_STRING_KEYS);
    pos[0] = Tcl_Tell(out);
    if (!isList && (objc > 3)) {
        strip = Tcl_GetString(objv[3]);
        slen = strlen(strip);
    }
    for (i = 0; i < lobjc; i += (isList ? 2 : 1)) {
        const char *path, *name;

        path = Tcl_GetString(lobjv[i]);
        if (isList) {
            name = Tcl_GetString(lobjv[i + 1]);
        } else {
            name = path;
            if (slen > 0) {
                len = strlen(name);
                if ((len <= slen) || (strncmp(strip, name, slen) != 0)) {
                    continue;
                }
                name += slen;
            }
        }
        while (name[0] == '/') {
            ++name;
        }
        if (name[0] == '\0') {
            continue;
        }
        if (ZipAddFile(interp, path, name, out, pw, buf, sizeof (buf),
                       &fileHash) != TCL_OK) {
            goto done;
        }
    }
    pos[1] = Tcl_Tell(out);
    count = 0;
    for (i = 0; i < lobjc; i += (isList ? 2 : 1)) {
        const char *path, *name;

        path = Tcl_GetString(lobjv[i]);
        if (isList) {
            name = Tcl_GetString(lobjv[i + 1]);
        } else {
            name = path;
            if (slen > 0) {
                len = strlen(name);
                if ((len <= slen) || (strncmp(strip, name, slen) != 0)) {
                    continue;
                }
                name += slen;
            }
        }
        while (name[0] == '/') {
            ++name;
        }
        if (name[0] == '\0') {
            continue;
        }
        hPtr = Tcl_FindHashEntry(&fileHash, name);
        if (hPtr == NULL) {
            continue;
        }
        z = (ZipEntry *) Tcl_GetHashValue(hPtr);
        len = strlen(z->name);
        zip_write_int(buf + ZIP_CENTRAL_SIG_OFFS, ZIP_CENTRAL_HEADER_SIG);
        zip_write_short(buf + ZIP_CENTRAL_VERSIONMADE_OFFS, ZIP_MIN_VERSION);
        zip_write_short(buf + ZIP_CENTRAL_VERSION_OFFS, ZIP_MIN_VERSION);
        zip_write_short(buf + ZIP_CENTRAL_FLAGS_OFFS, z->isenc ? 1 : 0);
        zip_write_short(buf + ZIP_CENTRAL_COMPMETH_OFFS, z->cmeth);
        zip_write_short(buf + ZIP_CENTRAL_MTIME_OFFS, ToDosTime(z->timestamp));
        zip_write_short(buf + ZIP_CENTRAL_MDATE_OFFS, ToDosDate(z->timestamp));
        zip_write_int(buf + ZIP_CENTRAL_CRC32_OFFS, z->crc32);
        zip_write_int(buf + ZIP_CENTRAL_COMPLEN_OFFS, z->nbytecompr);
        zip_write_int(buf + ZIP_CENTRAL_UNCOMPLEN_OFFS, z->nbyte);
        zip_write_short(buf + ZIP_CENTRAL_PATHLEN_OFFS, len);
        zip_write_short(buf + ZIP_CENTRAL_EXTRALEN_OFFS, 0);
        zip_write_short(buf + ZIP_CENTRAL_FCOMMENTLEN_OFFS, 0);
        zip_write_short(buf + ZIP_CENTRAL_DISKFILE_OFFS, 0);
        zip_write_short(buf + ZIP_CENTRAL_IATTR_OFFS, 0);
        zip_write_int(buf + ZIP_CENTRAL_EATTR_OFFS, 0);
        zip_write_int(buf + ZIP_CENTRAL_LOCALHDR_OFFS, z->offset - pos[0]);
        if (
            (Tcl_Write(out, buf, ZIP_CENTRAL_HEADER_LEN) != ZIP_CENTRAL_HEADER_LEN)
            || (Tcl_Write(out, z->name, len) != len)
        ) {
            Tcl_SetObjResult(interp, Tcl_NewStringObj("write error", -1));
            goto done;
        }
        count++;
    }
    Tcl_Flush(out);
    pos[2] = Tcl_Tell(out);
    zip_write_int(buf + ZIP_CENTRAL_END_SIG_OFFS, ZIP_CENTRAL_END_SIG);
    zip_write_short(buf + ZIP_CENTRAL_DISKNO_OFFS, 0);
    zip_write_short(buf + ZIP_CENTRAL_DISKDIR_OFFS, 0);
    zip_write_short(buf + ZIP_CENTRAL_ENTS_OFFS, count);
    zip_write_short(buf + ZIP_CENTRAL_TOTALENTS_OFFS, count);
    zip_write_int(buf + ZIP_CENTRAL_DIRSIZE_OFFS, pos[2] - pos[1]);
    zip_write_int(buf + ZIP_CENTRAL_DIRSTART_OFFS, pos[1] - pos[0]);
    zip_write_short(buf + ZIP_CENTRAL_COMMENTLEN_OFFS, 0);
    if (Tcl_Write(out, buf, ZIP_CENTRAL_END_LEN) != ZIP_CENTRAL_END_LEN) {
        Tcl_SetObjResult(interp, Tcl_NewStringObj("write error", -1));
        goto done;
    }
    Tcl_Flush(out);
    ret = TCL_OK;
done:
    if (ret == TCL_OK) {
        ret = Tcl_Close(interp, out);
    } else {
        Tcl_Close(interp, out);
    }
    Tcl_DecrRefCount(list);
    hPtr = Tcl_FirstHashEntry(&fileHash, &search);
    while (hPtr != NULL) {
        z = (ZipEntry *) Tcl_GetHashValue(hPtr);
        Tcl_Free((char *) z);
        Tcl_DeleteHashEntry(hPtr);
        hPtr = Tcl_NextHashEntry(&search);
    }
    Tcl_DeleteHashTable(&fileHash);
    return ret;
}

/*
 *-------------------------------------------------------------------------
 *
 * ZipFSMkZipObjCmd --
 *
 *      This procedure is invoked to process the "zipfs::mkzip" command.
 *    See description of ZipFSMkZipOrImgCmd().
 *
 * Results:
 *      A standard Tcl result.
 *
 * Side effects:
 *    See description of ZipFSMkZipOrImgCmd().
 *
 *-------------------------------------------------------------------------
 */

static int
ZipFSMkZipObjCmd(
    ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]
) {
    return ZipFSMkZipOrImgObjCmd(clientData, interp, 0, 0, objc, objv);
}

static int
ZipFSLMkZipObjCmd(
    ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]
) {
    return ZipFSMkZipOrImgObjCmd(clientData, interp, 0, 1, objc, objv);
}

/*
 *-------------------------------------------------------------------------
 *
 * ZipFSZipFSOpenArchiveObjCmd --
 *
 *      This procedure is invoked to process the "zipfs::mkimg" command.
 *    See description of ZipFSMkZipOrImgCmd().
 *
 * Results:
 *      A standard Tcl result.
 *
 * Side effects:
 *    See description of ZipFSMkZipOrImgCmd().
 *
 *-------------------------------------------------------------------------
 */

static int
ZipFSMkImgObjCmd(ClientData clientData, Tcl_Interp *interp,
         int objc, Tcl_Obj *const objv[])
{
    return ZipFSMkZipOrImgObjCmd(clientData, interp, 1, 0, objc, objv);
}

static int
ZipFSLMkImgObjCmd(ClientData clientData, Tcl_Interp *interp,
          int objc, Tcl_Obj *const objv[])
{
    return ZipFSMkZipOrImgObjCmd(clientData, interp, 1, 1, objc, objv);
}

/*
 *-------------------------------------------------------------------------
 *
 * ZipFSExistsObjCmd --
 *
 *      This procedure is invoked to process the "zipfs::exists" command.
 *    It tests for the existence of a file in the ZIP filesystem and
 *    places a boolean into the interp's result.
 *
 * Results:
 *      Always TCL_OK.
 *
 * Side effects:
 *      None.
 *
 *-------------------------------------------------------------------------
 */

static int
ZipFSCanonicalObjCmd(
    ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]
) {
    char *mntpoint=NULL;
    char *filename=NULL;
    char *result;
    Tcl_DString dPath;

    if (objc != 2 && objc != 3 && objc!=4) {
        Tcl_WrongNumArgs(interp, 1, objv, "?mntpnt? filename ?ZIPFS?");
        return TCL_ERROR;
    }
    Tcl_DStringInit(&dPath);
    if(objc==2) {
        filename = Tcl_GetString(objv[1]);
        result=CanonicalPath("",filename,&dPath,1);
    } else if (objc==3) {
        mntpoint = Tcl_GetString(objv[1]);
        filename = Tcl_GetString(objv[2]);
        result=CanonicalPath(mntpoint,filename,&dPath,1);
    } else {
        int zipfs=0;
        if(Tcl_GetBooleanFromObj(interp,objv[3],&zipfs)) {
            return TCL_ERROR;
        }
        mntpoint = Tcl_GetString(objv[1]);
        filename = Tcl_GetString(objv[2]);
        result=CanonicalPath(mntpoint,filename,&dPath,zipfs);
    }
    Tcl_SetObjResult(interp,Tcl_NewStringObj(result,-1));
    return TCL_OK;
}

/*
 *-------------------------------------------------------------------------
 *
 * ZipFSExistsObjCmd --
 *
 *      This procedure is invoked to process the "zipfs::exists" command.
 *    It tests for the existence of a file in the ZIP filesystem and
 *    places a boolean into the interp's result.
 *
 * Results:
 *      Always TCL_OK.
 *
 * Side effects:
 *      None.
 *
 *-------------------------------------------------------------------------
 */

static int
ZipFSExistsObjCmd(
    ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]
) {
    char *filename;
    int exists;
    Tcl_DString ds;

    if (objc != 2) {
      Tcl_WrongNumArgs(interp, 1, objv, "filename");
      return TCL_ERROR;
    }

    /* prepend ZIPFS_VOLUME to filename, eliding the final / */
    filename = Tcl_GetStringFromObj(objv[1], 0);
    Tcl_DStringInit(&ds);
    Tcl_DStringAppend(&ds, ZIPFS_VOLUME, ZIPFS_VOLUME_LEN-1);
    Tcl_DStringAppend(&ds, filename, -1);
    filename = Tcl_DStringValue(&ds);

    ReadLock();
    exists = ZipFSLookup(filename) != NULL;
    Unlock();

    Tcl_SetObjResult(interp,Tcl_NewBooleanObj(exists));
    return TCL_OK;
}

/*
 *-------------------------------------------------------------------------
 *
 * ZipFSInfoObjCmd --
 *
 *      This procedure is invoked to process the "zipfs::info" command.
 *    On success, it returns a Tcl list made up of name of ZIP archive
 *    file, size uncompressed, size compressed, and archive offset of
 *    a file in the ZIP filesystem.
 *
 * Results:
 *      A standard Tcl result.
 *
 * Side effects:
 *      None.
 *
 *-------------------------------------------------------------------------
 */

static int
ZipFSInfoObjCmd(
    ClientData clientData, Tcl_Interp *interp,int objc, Tcl_Obj *const objv[]
) {
    char *filename;
    ZipEntry *z;

    if (objc != 2) {
        Tcl_WrongNumArgs(interp, 1, objv, "filename");
        return TCL_ERROR;
    }
    filename = Tcl_GetStringFromObj(objv[1], 0);
    ReadLock();
    z = ZipFSLookup(filename);
    if (z != NULL) {
        Tcl_Obj *result = Tcl_GetObjResult(interp);

        Tcl_ListObjAppendElement(interp, result,
                     Tcl_NewStringObj(z->zipfile->name, -1));
        Tcl_ListObjAppendElement(interp, result, Tcl_NewIntObj(z->nbyte));
        Tcl_ListObjAppendElement(interp, result, Tcl_NewIntObj(z->nbytecompr));
        Tcl_ListObjAppendElement(interp, result, Tcl_NewIntObj(z->offset));
    }
    Unlock();
    return TCL_OK;
}

/*
 *-------------------------------------------------------------------------
 *
 * ZipFSListObjCmd --
 *
 *      This procedure is invoked to process the "zipfs::list" command.
 *    On success, it returns a Tcl list of files of the ZIP filesystem
 *    which match a search pattern (glob or regexp).
 *
 * Results:
 *      A standard Tcl result.
 *
 * Side effects:
 *      None.
 *
 *-------------------------------------------------------------------------
 */

static int
ZipFSListObjCmd(
    ClientData clientData, Tcl_Interp *interp,int objc, Tcl_Obj *const objv[]
) {
    char *pattern = NULL;
    Tcl_RegExp regexp = NULL;
    Tcl_HashEntry *hPtr;
    Tcl_HashSearch search;
    Tcl_Obj *result = Tcl_GetObjResult(interp);

    if (objc > 3) {
        Tcl_WrongNumArgs(interp, 1, objv, "?(-glob|-regexp)? ?pattern?");
        return TCL_ERROR;
    }
    if (objc == 3) {
        int n;
        char *what = Tcl_GetStringFromObj(objv[1], &n);

        if ((n >= 2) && (strncmp(what, "-glob", n) == 0)) {
            pattern = Tcl_GetString(objv[2]);
        } else if ((n >= 2) && (strncmp(what, "-regexp", n) == 0)) {
            regexp = Tcl_RegExpCompile(interp, Tcl_GetString(objv[2]));
            if (regexp == NULL) {
                return TCL_ERROR;
            }
        } else {
            Tcl_AppendResult(interp, "unknown option \"", what,"\"", (char *) NULL);
            return TCL_ERROR;
        }
    } else if (objc == 2) {
        pattern = Tcl_GetStringFromObj(objv[1], 0);
    }
    ReadLock();
    if (pattern != NULL) {
        for (
            hPtr = Tcl_FirstHashEntry(&ZipFS.fileHash, &search);
            hPtr != NULL;
            hPtr = Tcl_NextHashEntry(&search)
        ) {
            ZipEntry *z = (ZipEntry *) Tcl_GetHashValue(hPtr);

            if (Tcl_StringMatch(z->name, pattern)) {
                Tcl_ListObjAppendElement(interp, result,Tcl_NewStringObj(z->name, -1));
            }
        }
    } else if (regexp != NULL) {
        for (
            hPtr = Tcl_FirstHashEntry(&ZipFS.fileHash, &search);
            hPtr != NULL;
            hPtr = Tcl_NextHashEntry(&search)
        ) {
            ZipEntry *z = (ZipEntry *) Tcl_GetHashValue(hPtr);
            if (Tcl_RegExpExec(interp, regexp, z->name, z->name)) {
                Tcl_ListObjAppendElement(interp, result,Tcl_NewStringObj(z->name, -1));
            }
        }
    } else {
        for (
            hPtr = Tcl_FirstHashEntry(&ZipFS.fileHash, &search);
            hPtr != NULL;
            hPtr = Tcl_NextHashEntry(&search)
        ) {
            ZipEntry *z = (ZipEntry *) Tcl_GetHashValue(hPtr);

            Tcl_ListObjAppendElement(interp, result, Tcl_NewStringObj(z->name, -1));
        }
    }
    Unlock();
    return TCL_OK;
}

/*
 *-------------------------------------------------------------------------
 *
 * ZipFSTclLibraryObjCmd --
 *
 *      This procedure is invoked to process the "zipfs::root" command. It
 *      returns the root that all zipfs file systems are mounted under.
 *
 * Results:
 *      A standard Tcl result.
 *
 * Side effects:
 *
 *-------------------------------------------------------------------------
 */

static int
ZipFSTclLibraryObjCmd(ClientData clientData, Tcl_Interp *interp,
         int objc, Tcl_Obj *const objv[])
{
    Tcl_Obj *pResult;

    pResult=TclZipfs_TclLibrary();
    if(!pResult) {
        pResult=Tcl_NewObj();
    }
    Tcl_SetObjResult(interp,pResult);
    return TCL_OK;
}

/*
 *-------------------------------------------------------------------------
 *
 * ZipChannelClose --
 *
 *    This function is called to close a channel.
 *
 * Results:
 *    Always TCL_OK.
 *
 * Side effects:
 *    Resources are free'd.
 *
 *-------------------------------------------------------------------------
 */

static int
ZipChannelClose(ClientData instanceData, Tcl_Interp *interp)
{
    ZipChannel *info = (ZipChannel *) instanceData;

    if (info->iscompr && (info->ubuf != NULL)) {
        Tcl_Free((char *) info->ubuf);
        info->ubuf = NULL;
    }
    if (info->isenc) {
        info->isenc = 0;
        memset(info->keys, 0, sizeof (info->keys));
    }
    if (info->iswr) {
        ZipEntry *z = info->zipentry;
        unsigned char *newdata;

        newdata = (unsigned char *) Tcl_AttemptRealloc((char *) info->ubuf, info->nread);
        if (newdata != NULL) {
            if (z->data != NULL) {
                Tcl_Free((char *) z->data);
            }
            z->data = newdata;
            z->nbyte = z->nbytecompr = info->nbyte;
            z->cmeth = ZIP_COMPMETH_STORED;
            z->timestamp = time(NULL);
            z->isdir = 0;
            z->isenc = 0;
            z->offset = 0;
            z->crc32 = 0;
        } else {
            Tcl_Free((char *) info->ubuf);
        }
    }
    WriteLock();
    info->zipfile->nopen--;
    Unlock();
    Tcl_Free((char *) info);
    return TCL_OK;
}

/*
 *-------------------------------------------------------------------------
 *
 * ZipChannelRead --
 *
 *        This function is called to read data from channel.
 *
 * Results:
 *        Number of bytes read or -1 on error with error number set.
 *
 * Side effects:
 *        Data is read and file pointer is advanced.
 *
 *-------------------------------------------------------------------------
 */

static int
ZipChannelRead(ClientData instanceData, char *buf, int toRead, int *errloc)
{
    ZipChannel *info = (ZipChannel *) instanceData;
    unsigned long nextpos;

    if (info->isdir < 0) {
        /*
         * Special case: when executable combined with ZIP archive file
         * read data in front of ZIP, i.e. the executable itself.
         */
        nextpos = info->nread + toRead;
        if (nextpos > info->zipfile->baseoffs) {
            toRead = info->zipfile->baseoffs - info->nread;
            nextpos = info->zipfile->baseoffs;
        }
        if (toRead == 0) {
            return 0;
        }
        memcpy(buf, info->zipfile->data, toRead);
        info->nread = nextpos;
        *errloc = 0;
        return toRead;
    }
    if (info->isdir) {
        *errloc = EISDIR;
        return -1;
    }
    nextpos = info->nread + toRead;
    if (nextpos > info->nbyte) {
        toRead = info->nbyte - info->nread;
        nextpos = info->nbyte;
    }
    if (toRead == 0) {
        return 0;
    }
    if (info->isenc) {
        int i, ch;

        for (i = 0; i < toRead; i++) {
            ch = info->ubuf[i + info->nread];
            buf[i] = zdecode(info->keys, crc32tab, ch);
        }
    } else {
        memcpy(buf, info->ubuf + info->nread, toRead);
    }
    info->nread = nextpos;
    *errloc = 0;
    return toRead;
}

/*
 *-------------------------------------------------------------------------
 *
 * ZipChannelWrite --
 *
 *    This function is called to write data into channel.
 *
 * Results:
 *    Number of bytes written or -1 on error with error number set.
 *
 * Side effects:
 *    Data is written and file pointer is advanced.
 *
 *-------------------------------------------------------------------------
 */

static int
ZipChannelWrite(ClientData instanceData, const char *buf,
        int toWrite, int *errloc)
{
    ZipChannel *info = (ZipChannel *) instanceData;
    unsigned long nextpos;

    if (!info->iswr) {
        *errloc = EINVAL;
        return -1;
    }
    nextpos = info->nread + toWrite;
    if (nextpos > info->nmax) {
        toWrite = info->nmax - info->nread;
        nextpos = info->nmax;
    }
    if (toWrite == 0) {
        return 0;
    }
    memcpy(info->ubuf + info->nread, buf, toWrite);
    info->nread = nextpos;
    if (info->nread > info->nbyte) {
        info->nbyte = info->nread;
    }
    *errloc = 0;
    return toWrite;
}

/*
 *-------------------------------------------------------------------------
 *
 * ZipChannelSeek --
 *
 *        This function is called to position file pointer of channel.
 *
 * Results:
 *        New file position or -1 on error with error number set.
 *
 * Side effects:
 *        File pointer is repositioned according to offset and mode.
 *
 *-------------------------------------------------------------------------
 */

static int
ZipChannelSeek(ClientData instanceData, long offset, int mode, int *errloc)
{
    ZipChannel *info = (ZipChannel *) instanceData;
    unsigned long end;

    if (!info->iswr && (info->isdir < 0)) {
        /*
         * Special case: when executable combined with ZIP archive file,
         * seek within front of ZIP, i.e. the executable itself.
         */
        end = info->zipfile->baseoffs;
    } else if (info->isdir) {
        *errloc = EINVAL;
        return -1;
    } else {
        end = info->nbyte;
    }
    switch (mode) {
    case SEEK_CUR:
        offset += info->nread;
        break;
    case SEEK_END:
        offset += end;
        break;
    case SEEK_SET:
        break;
    default:
        *errloc = EINVAL;
        return -1;
    }
    if (offset < 0) {
        *errloc = EINVAL;
        return -1;
    }
    if (info->iswr) {
        if ((unsigned long) offset > info->nmax) {
            *errloc = EINVAL;
            return -1;
        }
        if ((unsigned long) offset > info->nbyte) {
            info->nbyte = offset;
        }
    } else if ((unsigned long) offset > end) {
        *errloc = EINVAL;
        return -1;
    }
    info->nread = (unsigned long) offset;
    return info->nread;
}

/*
 *-------------------------------------------------------------------------
 *
 * ZipChannelWatchChannel --
 *
 *    This function is called for event notifications on channel.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    None.
 *
 *-------------------------------------------------------------------------
 */

static void
ZipChannelWatchChannel(ClientData instanceData, int mask)
{
    return;
}

/*
 *-------------------------------------------------------------------------
 *
 * ZipChannelGetFile --
 *
 *    This function is called to retrieve OS handle for channel.
 *
 * Results:
 *    Always TCL_ERROR since there's never an OS handle for a
 *    file within a ZIP archive.
 *
 * Side effects:
 *    None.
 *
 *-------------------------------------------------------------------------
 */

static int
ZipChannelGetFile(
    ClientData instanceData, int direction,ClientData *handlePtr
) {
    return TCL_ERROR;
}

/*
 * The channel type/driver definition used for ZIP archive members.
 */

static Tcl_ChannelType ZipChannelType = {
    "zip",                  /* Type name. */
#ifdef TCL_CHANNEL_VERSION_4
    TCL_CHANNEL_VERSION_4,
    ZipChannelClose,        /* Close channel, clean instance data */
    ZipChannelRead,         /* Handle read request */
    ZipChannelWrite,        /* Handle write request */
    ZipChannelSeek,         /* Move location of access point, NULL'able */
    NULL,                   /* Set options, NULL'able */
    NULL,                   /* Get options, NULL'able */
    ZipChannelWatchChannel, /* Initialize notifier */
    ZipChannelGetFile,      /* Get OS handle from the channel */
    NULL,                   /* 2nd version of close channel, NULL'able */
    NULL,                   /* Set blocking mode for raw channel, NULL'able */
    NULL,                   /* Function to flush channel, NULL'able */
    NULL,                   /* Function to handle event, NULL'able */
    NULL,                   /* Wide seek function, NULL'able */
    NULL,                   /* Thread action function, NULL'able */
#else
    NULL,                   /* Set blocking/nonblocking behaviour, NULL'able */
    ZipChannelClose,        /* Close channel, clean instance data */
    ZipChannelRead,         /* Handle read request */
    ZipChannelWrite,        /* Handle write request */
    ZipChannelSeek,         /* Move location of access point, NULL'able */
    NULL,                   /* Set options, NULL'able */
    NULL,                   /* Get options, NULL'able */
    ZipChannelWatchChannel, /* Initialize notifier */
    ZipChannelGetFile,      /* Get OS handle from the channel */
#endif
};

/*
 *-------------------------------------------------------------------------
 *
 * ZipChannelOpen --
 *
 *    This function opens a Tcl_Channel on a file from a mounted ZIP
 *    archive according to given open mode.
 *
 * Results:
 *    Tcl_Channel on success, or NULL on error.
 *
 * Side effects:
 *    Memory is allocated, the file from the ZIP archive is uncompressed.
 *
 *-------------------------------------------------------------------------
 */

static Tcl_Channel
ZipChannelOpen(Tcl_Interp *interp, char *filename, int mode, int permissions)
{
    ZipEntry *z;
    ZipChannel *info;
    int i, ch, trunc, wr, flags = 0;
    char cname[128];

    if (
        (mode & O_APPEND)
        || ((ZipFS.wrmax <= 0) && (mode & (O_WRONLY | O_RDWR)))
    ) {
        if (interp != NULL) {
            Tcl_SetObjResult(interp, Tcl_NewStringObj("unsupported open mode", -1));
        }
        return NULL;
    }
    WriteLock();
    z = ZipFSLookup(filename);
    if (z == NULL) {
        if (interp != NULL) {
            Tcl_SetObjResult(interp, Tcl_NewStringObj("file not found", -1));
            Tcl_AppendResult(interp, " \"", filename, "\"", NULL);
        }
        goto error;
    }
    trunc = (mode & O_TRUNC) != 0;
    wr = (mode & (O_WRONLY | O_RDWR)) != 0;
    if ((z->cmeth != ZIP_COMPMETH_STORED) && (z->cmeth != ZIP_COMPMETH_DEFLATED)) {
        ZIPFS_ERROR(interp,"unsupported compression method");
        goto error;
    }
    if (wr && z->isdir) {
        ZIPFS_ERROR(interp,"unsupported file type");
        goto error;
    }
    if (!trunc) {
        flags |= TCL_READABLE;
        if (z->isenc && (z->zipfile->pwbuf[0] == 0)) {
            ZIPFS_ERROR(interp,"decryption failed");
            goto error;
        } else if (wr && (z->data == NULL) && (z->nbyte > ZipFS.wrmax)) {
            ZIPFS_ERROR(interp,"file too large");
            goto error;
        }
    } else {
        flags = TCL_WRITABLE;
    }
    info = (ZipChannel *) Tcl_AttemptAlloc(sizeof (*info));
    if (info == NULL) {
        ZIPFS_ERROR(interp,"out of memory");
        goto error;
    }
    info->zipfile = z->zipfile;
    info->zipentry = z;
    info->nread = 0;
    if (wr) {
        flags |= TCL_WRITABLE;
        info->iswr = 1;
        info->isdir = 0;
        info->nmax = ZipFS.wrmax;
        info->iscompr = 0;
        info->isenc = 0;
        info->ubuf = (unsigned char *) Tcl_AttemptAlloc(info->nmax);
        if (info->ubuf == NULL) {
merror0:
            if (info->ubuf != NULL) {
                Tcl_Free((char *) info->ubuf);
            }
            Tcl_Free((char *) info);
            ZIPFS_ERROR(interp,"out of memory");
            goto error;
        }
        memset(info->ubuf, 0, info->nmax);
        if (trunc) {
            info->nbyte = 0;
        } else {
            if (z->data != NULL) {
                unsigned int j = z->nbyte;

                if (j > info->nmax) {
                    j = info->nmax;
                }
                memcpy(info->ubuf, z->data, j);
                info->nbyte = j;
            } else {
                unsigned char *zbuf = z->zipfile->data + z->offset;

                if (z->isenc) {
                    int len = z->zipfile->pwbuf[0];
                    char pwbuf[260];

                    for (i = 0; i < len; i++) {
                        ch = z->zipfile->pwbuf[len - i];
                        pwbuf[i] = (ch & 0x0f) | pwrot[(ch >> 4) & 0x0f];
                    }
                    pwbuf[i] = '\0';
                    init_keys(pwbuf, info->keys, crc32tab);
                    memset(pwbuf, 0, sizeof (pwbuf));
                    for (i = 0; i < 12; i++) {
                        ch = info->ubuf[i];
                        zdecode(info->keys, crc32tab, ch);
                    }
                    zbuf += i;
                }
                if (z->cmeth == ZIP_COMPMETH_DEFLATED) {
                    z_stream stream;
                    int err;
                    unsigned char *cbuf = NULL;

                    memset(&stream, 0, sizeof (stream));
                    stream.zalloc = Z_NULL;
                    stream.zfree = Z_NULL;
                    stream.opaque = Z_NULL;
                    stream.avail_in = z->nbytecompr;
                        if (z->isenc) {
                        unsigned int j;

                        stream.avail_in -= 12;
                        cbuf = (unsigned char *)
                            Tcl_AttemptAlloc(stream.avail_in);
                        if (cbuf == NULL) {
                            goto merror0;
                        }
                        for (j = 0; j < stream.avail_in; j++) {
                            ch = info->ubuf[j];
                            cbuf[j] = zdecode(info->keys, crc32tab, ch);
                        }
                        stream.next_in = cbuf;
                    } else {
                        stream.next_in = zbuf;
                    }
                    stream.next_out = info->ubuf;
                    stream.avail_out = info->nmax;
                    if (inflateInit2(&stream, -15) != Z_OK) goto cerror0;
                    err = inflate(&stream, Z_SYNC_FLUSH);
                    inflateEnd(&stream);
                    if ((err == Z_STREAM_END) || ((err == Z_OK) && (stream.avail_in == 0))) {
                        if (cbuf != NULL) {
                            memset(info->keys, 0, sizeof (info->keys));
                            Tcl_Free((char *) cbuf);
                        }
                        goto wrapchan;
                    }
cerror0:
                    if (cbuf != NULL) {
                        memset(info->keys, 0, sizeof (info->keys));
                        Tcl_Free((char *) cbuf);
                    }
                    if (info->ubuf != NULL) {
                        Tcl_Free((char *) info->ubuf);
                    }
                    Tcl_Free((char *) info);
                    ZIPFS_ERROR(interp,"decompression error");
                    goto error;
                } else if (z->isenc) {
                    for (i = 0; i < z->nbyte - 12; i++) {
                        ch = zbuf[i];
                        info->ubuf[i] = zdecode(info->keys, crc32tab, ch);
                    }
                } else {
                    memcpy(info->ubuf, zbuf, z->nbyte);
                }
                memset(info->keys, 0, sizeof (info->keys));
                goto wrapchan;
            }
        }
    } else if (z->data != NULL) {
        flags |= TCL_READABLE;
        info->iswr = 0;
        info->iscompr = 0;
        info->isdir = 0;
        info->isenc = 0;
        info->nbyte = z->nbyte;
        info->nmax = 0;
        info->ubuf = z->data;
    } else {
        flags |= TCL_READABLE;
        info->iswr = 0;
        info->iscompr = z->cmeth == ZIP_COMPMETH_DEFLATED;
        info->ubuf = z->zipfile->data + z->offset;
        info->isdir = z->isdir;
        info->isenc = z->isenc;
        info->nbyte = z->nbyte;
        info->nmax = 0;
        if (info->isenc) {
            int len = z->zipfile->pwbuf[0];
            char pwbuf[260];

            for (i = 0; i < len; i++) {
                ch = z->zipfile->pwbuf[len - i];
                pwbuf[i] = (ch & 0x0f) | pwrot[(ch >> 4) & 0x0f];
            }
            pwbuf[i] = '\0';
            init_keys(pwbuf, info->keys, crc32tab);
            memset(pwbuf, 0, sizeof (pwbuf));
            for (i = 0; i < 12; i++) {
                ch = info->ubuf[i];
                zdecode(info->keys, crc32tab, ch);
            }
            info->ubuf += i;
        }
        if (info->iscompr) {
            z_stream stream;
            int err;
            unsigned char *ubuf = NULL;
            unsigned int j;

            memset(&stream, 0, sizeof (stream));
            stream.zalloc = Z_NULL;
            stream.zfree = Z_NULL;
            stream.opaque = Z_NULL;
            stream.avail_in = z->nbytecompr;
            if (info->isenc) {
                stream.avail_in -= 12;
                ubuf = (unsigned char *) Tcl_AttemptAlloc(stream.avail_in);
                if (ubuf == NULL) {
                    info->ubuf = NULL;
                    goto merror;
                }
                for (j = 0; j < stream.avail_in; j++) {
                    ch = info->ubuf[j];
                    ubuf[j] = zdecode(info->keys, crc32tab, ch);
                }
                stream.next_in = ubuf;
                } else {
                stream.next_in = info->ubuf;
            }
            stream.next_out = info->ubuf = (unsigned char *) Tcl_AttemptAlloc(info->nbyte);
            if (info->ubuf == NULL) {
merror:
                if (ubuf != NULL) {
                    info->isenc = 0;
                    memset(info->keys, 0, sizeof (info->keys));
                    Tcl_Free((char *) ubuf);
                }
                Tcl_Free((char *) info);
                if (interp != NULL) {
                    Tcl_SetObjResult(interp,
                    Tcl_NewStringObj("out of memory", -1));
                }
                goto error;
            }
            stream.avail_out = info->nbyte;
            if (inflateInit2(&stream, -15) != Z_OK) {
                goto cerror;
            }
            err = inflate(&stream, Z_SYNC_FLUSH);
            inflateEnd(&stream);
            if ((err == Z_STREAM_END) || ((err == Z_OK) && (stream.avail_in == 0))) {
                if (ubuf != NULL) {
                    info->isenc = 0;
                    memset(info->keys, 0, sizeof (info->keys));
                    Tcl_Free((char *) ubuf);
                }
                goto wrapchan;
            }
cerror:
            if (ubuf != NULL) {
                info->isenc = 0;
                memset(info->keys, 0, sizeof (info->keys));
                Tcl_Free((char *) ubuf);
            }
            if (info->ubuf != NULL) {
                Tcl_Free((char *) info->ubuf);
            }
            Tcl_Free((char *) info);
            ZIPFS_ERROR(interp,"decompression error");
            goto error;
        }
    }
wrapchan:
    sprintf(cname, "zipfs_%lx_%d", (unsigned long) z->offset, ZipFS.idCount++);
    z->zipfile->nopen++;
    Unlock();
    return Tcl_CreateChannel(&ZipChannelType, cname, (ClientData) info, flags);

error:
    Unlock();
    return NULL;
}

/*
 *-------------------------------------------------------------------------
 *
 * ZipEntryStat --
 *
 *    This function implements the ZIP filesystem specific version
 *    of the library version of stat.
 *
 * Results:
 *    See stat documentation.
 *
 * Side effects:
 *    See stat documentation.
 *
 *-------------------------------------------------------------------------
 */

static int
ZipEntryStat(char *path, Tcl_StatBuf *buf)
{
    ZipEntry *z;
    int ret = -1;

    ReadLock();
    z = ZipFSLookup(path);
    if (z == NULL) goto done;

    memset(buf, 0, sizeof (Tcl_StatBuf));
    if (z->isdir) {
        buf->st_mode = S_IFDIR | 0555;
    } else {
        buf->st_mode = S_IFREG | 0555;
    }
    buf->st_size = z->nbyte;
    buf->st_mtime = z->timestamp;
    buf->st_ctime = z->timestamp;
    buf->st_atime = z->timestamp;
    ret = 0;
done:
    Unlock();
    return ret;
}

/*
 *-------------------------------------------------------------------------
 *
 * ZipEntryAccess --
 *
 *    This function implements the ZIP filesystem specific version
 *    of the library version of access.
 *
 * Results:
 *    See access documentation.
 *
 * Side effects:
 *    See access documentation.
 *
 *-------------------------------------------------------------------------
 */

static int
ZipEntryAccess(char *path, int mode)
{
    ZipEntry *z;

    if (mode & 3) return -1;
    ReadLock();
    z = ZipFSLookup(path);
    Unlock();
    return (z != NULL) ? 0 : -1;
}

/*
 *-------------------------------------------------------------------------
 *
 * Zip_FSOpenFileChannelProc --
 *
 * Results:
 *
 * Side effects:
 *
 *-------------------------------------------------------------------------
 */

static Tcl_Channel
Zip_FSOpenFileChannelProc(Tcl_Interp *interp, Tcl_Obj *pathPtr,
              int mode, int permissions)
{
    int len;
    if (!(pathPtr = Tcl_FSGetNormalizedPath(NULL, pathPtr))) return NULL;
    return ZipChannelOpen(interp, Tcl_GetStringFromObj(pathPtr, &len), mode, permissions);
}

/*
 *-------------------------------------------------------------------------
 *
 * Zip_FSStatProc --
 *
 *    This function implements the ZIP filesystem specific version
 *    of the library version of stat.
 *
 * Results:
 *    See stat documentation.
 *
 * Side effects:
 *    See stat documentation.
 *
 *-------------------------------------------------------------------------
 */

static int
Zip_FSStatProc(Tcl_Obj *pathPtr, Tcl_StatBuf *buf)
{
    int len;
    if (!(pathPtr = Tcl_FSGetNormalizedPath(NULL, pathPtr))) return -1;
    return ZipEntryStat(Tcl_GetStringFromObj(pathPtr, &len), buf);
}

/*
 *-------------------------------------------------------------------------
 *
 * Zip_FSAccessProc --
 *
 *    This function implements the ZIP filesystem specific version
 *    of the library version of access.
 *
 * Results:
 *    See access documentation.
 *
 * Side effects:
 *    See access documentation.
 *
 *-------------------------------------------------------------------------
 */

static int
Zip_FSAccessProc(Tcl_Obj *pathPtr, int mode)
{
    int len;
    if (!(pathPtr = Tcl_FSGetNormalizedPath(NULL, pathPtr))) return -1;
    return ZipEntryAccess(Tcl_GetStringFromObj(pathPtr, &len), mode);
}

/*
 *-------------------------------------------------------------------------
 *
 * Zip_FSFilesystemSeparatorProc --
 *
 *    This function returns the separator to be used for a given path. The
 *    object returned should have a refCount of zero
 *
 * Results:
 *    A Tcl object, with a refCount of zero. If the caller needs to retain a
 *    reference to the object, it should call Tcl_IncrRefCount, and should
 *    otherwise free the object.
 *
 * Side effects:
 *    None.
 *
 *-------------------------------------------------------------------------
 */

static Tcl_Obj *
Zip_FSFilesystemSeparatorProc(Tcl_Obj *pathPtr)
{
    return Tcl_NewStringObj("/", -1);
}

/*
 *-------------------------------------------------------------------------
 *
 * Zip_FSMatchInDirectoryProc --
 *
 *    This routine is used by the globbing code to search a directory for
 *    all files which match a given pattern.
 *
 * Results:
 *    The return value is a standard Tcl result indicating whether an
 *    error occurred in globbing. Errors are left in interp, good
 *    results are lappend'ed to resultPtr (which must be a valid object).
 *
 * Side effects:
 *    None.
 *
 *-------------------------------------------------------------------------
 */
static int
Zip_FSMatchInDirectoryProc(Tcl_Interp* interp, Tcl_Obj *result,
               Tcl_Obj *pathPtr, const char *pattern,
               Tcl_GlobTypeData *types)
{
    Tcl_HashEntry *hPtr;
    Tcl_HashSearch search;
    Tcl_Obj *normPathPtr;
    int scnt, len, l, dirOnly = -1, prefixLen, strip = 0;
    char *pat, *prefix, *path;
    Tcl_DString dsPref;

    if (!(normPathPtr = Tcl_FSGetNormalizedPath(NULL, pathPtr))) return -1;

    if (types != NULL) {
        dirOnly = (types->type & TCL_GLOB_TYPE_DIR) == TCL_GLOB_TYPE_DIR;
    }

    /* the prefix that gets prepended to results */
    prefix = Tcl_GetStringFromObj(pathPtr, &prefixLen);

    /* the (normalized) path we're searching */
    path = Tcl_GetStringFromObj(normPathPtr, &len);

    Tcl_DStringInit(&dsPref);
    Tcl_DStringAppend(&dsPref, prefix, prefixLen);

    if (strcmp(prefix, path) == 0) {
        prefix = NULL;
    } else {
        strip = len + 1;
    }
    if (prefix != NULL) {
        Tcl_DStringAppend(&dsPref, "/", 1);
        prefixLen++;
        prefix = Tcl_DStringValue(&dsPref);
    }
    ReadLock();
    if ((types != NULL) && (types->type == TCL_GLOB_TYPE_MOUNT)) {
    l = CountSlashes(path);
    if (path[len - 1] == '/') {
        len--;
    } else {
        l++;
    }
    if ((pattern == NULL) || (pattern[0] == '\0')) {
        pattern = "*";
    }
    hPtr = Tcl_FirstHashEntry(&ZipFS.zipHash, &search);
    while (hPtr != NULL) {
        ZipFile *zf = (ZipFile *) Tcl_GetHashValue(hPtr);

        if (zf->mntptlen == 0) {
            ZipEntry *z = zf->topents;
            while (z != NULL) {
                int lenz = strlen(z->name);
                if (
                    (lenz > len + 1)
                    && (strncmp(z->name, path, len) == 0)
                    && (z->name[len] == '/')
                    && (CountSlashes(z->name) == l)
                    && Tcl_StringCaseMatch(z->name + len + 1, pattern, 0)
                ) {
                    if (prefix != NULL) {
                        Tcl_DStringAppend(&dsPref, z->name, lenz);
                        Tcl_ListObjAppendElement(
                            NULL, result,
                            Tcl_NewStringObj(Tcl_DStringValue(&dsPref),
                            Tcl_DStringLength(&dsPref))
                        );
                        Tcl_DStringSetLength(&dsPref, prefixLen);
                    } else {
                        Tcl_ListObjAppendElement(NULL, result, Tcl_NewStringObj(z->name, lenz));
                    }
                }
                z = z->tnext;
            }
        } else if (
            (zf->mntptlen > len + 1)
            && (strncmp(zf->mntpt, path, len) == 0)
            && (zf->mntpt[len] == '/')
            && (CountSlashes(zf->mntpt) == l)
            && Tcl_StringCaseMatch(zf->mntpt + len + 1, pattern, 0)
        ) {
            if (prefix != NULL) {
                Tcl_DStringAppend(&dsPref, zf->mntpt, zf->mntptlen);
                Tcl_ListObjAppendElement(NULL, result,
                    Tcl_NewStringObj(Tcl_DStringValue(&dsPref),
                    Tcl_DStringLength(&dsPref)));
                Tcl_DStringSetLength(&dsPref, prefixLen);
            } else {
                Tcl_ListObjAppendElement(NULL, result,
                    Tcl_NewStringObj(zf->mntpt, zf->mntptlen));
            }
        }
        hPtr = Tcl_NextHashEntry(&search);
    }
    goto end;
    }
    if ((pattern == NULL) || (pattern[0] == '\0')) {
    hPtr = Tcl_FindHashEntry(&ZipFS.fileHash, path);
    if (hPtr != NULL) {
        ZipEntry *z = (ZipEntry *) Tcl_GetHashValue(hPtr);

        if ((dirOnly < 0) ||
            (!dirOnly && !z->isdir) ||
            (dirOnly && z->isdir)) {
        if (prefix != NULL) {
            Tcl_DStringAppend(&dsPref, z->name, -1);
            Tcl_ListObjAppendElement(NULL, result,
                Tcl_NewStringObj(Tcl_DStringValue(&dsPref),
                Tcl_DStringLength(&dsPref)));
            Tcl_DStringSetLength(&dsPref, prefixLen);
        } else {
            Tcl_ListObjAppendElement(NULL, result,
                Tcl_NewStringObj(z->name, -1));
        }
        }
    }
    goto end;
    }
    l = strlen(pattern);
    pat = Tcl_Alloc(len + l + 2);
    memcpy(pat, path, len);
    while ((len > 1) && (pat[len - 1] == '/')) {
        --len;
    }
    if ((len > 1) || (pat[0] != '/')) {
        pat[len] = '/';
        ++len;
    }
    memcpy(pat + len, pattern, l + 1);
    scnt = CountSlashes(pat);
    for (
        hPtr = Tcl_FirstHashEntry(&ZipFS.fileHash, &search);
        hPtr != NULL;
        hPtr = Tcl_NextHashEntry(&search)
    ) {
        ZipEntry *z = (ZipEntry *) Tcl_GetHashValue(hPtr);
        if (
            (dirOnly >= 0) && ((dirOnly && !z->isdir) || (!dirOnly && z->isdir))
        ) {
            continue;
        }
        if ((z->depth == scnt) && Tcl_StringCaseMatch(z->name, pat, 0)) {
            if (prefix != NULL) {
                Tcl_DStringAppend(&dsPref, z->name + strip, -1);
                Tcl_ListObjAppendElement(
                    NULL, result,
                    Tcl_NewStringObj(Tcl_DStringValue(&dsPref),
                    Tcl_DStringLength(&dsPref))
                );
                Tcl_DStringSetLength(&dsPref, prefixLen);
            } else {
                Tcl_ListObjAppendElement(NULL, result, Tcl_NewStringObj(z->name + strip, -1));
            }
        }
    }
    Tcl_Free(pat);
end:
    Unlock();
    Tcl_DStringFree(&dsPref);
    return TCL_OK;
}

/*
 *-------------------------------------------------------------------------
 *
 * Zip_FSPathInFilesystemProc --
 *
 *    This function determines if the given path object is in the
 *    ZIP filesystem.
 *
 * Results:
 *    TCL_OK when the path object is in the ZIP filesystem, -1 otherwise.
 *
 * Side effects:
 *    None.
 *
 *-------------------------------------------------------------------------
 */

static int
Zip_FSPathInFilesystemProc(Tcl_Obj *pathPtr, ClientData *clientDataPtr)
{
    Tcl_HashEntry *hPtr;
    Tcl_HashSearch search;
    ZipFile *zf;
    int ret = -1, len;
    char *path;

    if (!(pathPtr = Tcl_FSGetNormalizedPath(NULL, pathPtr))) return -1;

    path = Tcl_GetStringFromObj(pathPtr, &len);
    if(strncmp(path,ZIPFS_VOLUME,ZIPFS_VOLUME_LEN)!=0) {
        return -1;
    }

    len = strlen(path);

    ReadLock();
    hPtr = Tcl_FindHashEntry(&ZipFS.fileHash, path);
    if (hPtr != NULL) {
        ret = TCL_OK;
        goto endloop;
    }
    hPtr = Tcl_FirstHashEntry(&ZipFS.zipHash, &search);
    while (hPtr != NULL) {
        zf = (ZipFile *) Tcl_GetHashValue(hPtr);
        if (zf->mntptlen == 0) {
            ZipEntry *z = zf->topents;
            while (z != NULL) {
                int lenz = strlen(z->name);
                if (
                    (len >= lenz) && (strncmp(path, z->name, lenz) == 0)
                ) {
                    ret = TCL_OK;
                    goto endloop;
                }
                z = z->tnext;
            }
        } else if (
            (len >= zf->mntptlen) && (strncmp(path, zf->mntpt, zf->mntptlen) == 0)
        ) {
            ret = TCL_OK;
            goto endloop;
        }
        hPtr = Tcl_NextHashEntry(&search);
    }
endloop:
    Unlock();
    return ret;
}

/*
 *-------------------------------------------------------------------------
 *
 * Zip_FSListVolumesProc --
 *
 *    Lists the currently mounted ZIP filesystem volumes.
 *
 * Results:
 *    The list of volumes.
 *
 * Side effects:
 *    None
 *
 *-------------------------------------------------------------------------
 */
static Tcl_Obj *
Zip_FSListVolumesProc(void) {
    return Tcl_NewStringObj(ZIPFS_VOLUME, -1);
}

/*
 *-------------------------------------------------------------------------
 *
 * Zip_FSFileAttrStringsProc --
 *
 *    This function implements the ZIP filesystem dependent 'file attributes'
 *    subcommand, for listing the set of possible attribute strings.
 *
 * Results:
 *    An array of strings
 *
 * Side effects:
 *    None.
 *
 *-------------------------------------------------------------------------
 */

static const char *const *
Zip_FSFileAttrStringsProc(Tcl_Obj *pathPtr, Tcl_Obj** objPtrRef)
{
    static const char *const attrs[] = {
    "-uncompsize",
    "-compsize",
    "-offset",
    "-mount",
    "-archive",
    "-permissions",
    NULL,
    };
    return attrs;
}

/*
 *-------------------------------------------------------------------------
 *
 * Zip_FSFileAttrsGetProc --
 *
 *    This function implements the ZIP filesystem specific
 *    'file attributes' subcommand, for 'get' operations.
 *
 * Results:
 *    Standard Tcl return code. The object placed in objPtrRef (if TCL_OK
 *    was returned) is likely to have a refCount of zero. Either way we must
 *    either store it somewhere (e.g. the Tcl result), or Incr/Decr its
 *    refCount to ensure it is properly freed.
 *
 * Side effects:
 *    None.
 *
 *-------------------------------------------------------------------------
 */

static int
Zip_FSFileAttrsGetProc(Tcl_Interp *interp, int index, Tcl_Obj *pathPtr,
               Tcl_Obj **objPtrRef)
{
    int len, ret = TCL_OK;
    char *path;
    ZipEntry *z;

    if (!(pathPtr = Tcl_FSGetNormalizedPath(NULL, pathPtr))) return -1;
    path = Tcl_GetStringFromObj(pathPtr, &len);
    ReadLock();
    z = ZipFSLookup(path);
    if (z == NULL) {
        ZIPFS_ERROR(interp,"file not found");
        ret = TCL_ERROR;
        goto done;
    }
    switch (index) {
        case 0:
        *objPtrRef = Tcl_NewIntObj(z->nbyte);
        goto done;
        case 1:
        *objPtrRef= Tcl_NewIntObj(z->nbytecompr);
        goto done;
        case 2:
        *objPtrRef= Tcl_NewLongObj(z->offset);
        goto done;
        case 3:
        *objPtrRef= Tcl_NewStringObj(z->zipfile->mntpt, -1);
        goto done;
        case 4:
        *objPtrRef= Tcl_NewStringObj(z->zipfile->name, -1);
        goto done;
        case 5:
        *objPtrRef= Tcl_NewStringObj("0555", -1);
        goto done;
    }
    ZIPFS_ERROR(interp,"unknown attribute");
    ret = TCL_ERROR;
done:
    Unlock();
    return ret;
}

/*
 *-------------------------------------------------------------------------
 *
 * Zip_FSFileAttrsSetProc --
 *
 *    This function implements the ZIP filesystem specific
 *    'file attributes' subcommand, for 'set' operations.
 *
 * Results:
 *    Standard Tcl return code.
 *
 * Side effects:
 *    None.
 *
 *-------------------------------------------------------------------------
 */

static int
Zip_FSFileAttrsSetProc(Tcl_Interp *interp, int index, Tcl_Obj *pathPtr,Tcl_Obj *objPtr)
{
    if (interp != NULL) {
        Tcl_SetObjResult(interp, Tcl_NewStringObj("unsupported operation", -1));
    }
    return TCL_ERROR;
}

/*
 *-------------------------------------------------------------------------
 *
 * Zip_FSFilesystemPathTypeProc --
 *
 * Results:
 *
 * Side effects:
 *
 *-------------------------------------------------------------------------
 */

static Tcl_Obj *
Zip_FSFilesystemPathTypeProc(Tcl_Obj *pathPtr)
{
    return Tcl_NewStringObj("zip", -1);
}


/*
 *-------------------------------------------------------------------------
 *
 * Zip_FSLoadFile --
 *
 *        This functions deals with loading native object code. If
 *        the given path object refers to a file within the ZIP
 *        filesystem, an approriate error code is returned to delegate
 *        loading to the caller (by copying the file to temp store
 *        and loading from there). As fallback when the file refers
 *        to the ZIP file system but is not present, it is looked up
 *        relative to the executable and loaded from there when available.
 *
 * Results:
 *        TCL_OK on success, TCL_ERROR otherwise with error message left.
 *
 * Side effects:
 *        Loads native code into the process address space.
 *
 *-------------------------------------------------------------------------
 */

static int
Zip_FSLoadFile(Tcl_Interp *interp, Tcl_Obj *path, Tcl_LoadHandle *loadHandle,
               Tcl_FSUnloadFileProc **unloadProcPtr, int flags)
{
    Tcl_FSLoadFileProc2 *loadFileProc;
#ifdef ANDROID
    /*
     * Force loadFileProc to native implementation since the
     * package manager already extracted the shared libraries
     * from the APK at install time.
     */

    loadFileProc = (Tcl_FSLoadFileProc2 *) tclNativeFilesystem.loadFileProc;
    if (loadFileProc != NULL) {
        return loadFileProc(interp, path, loadHandle, unloadProcPtr, flags);
    }
    Tcl_SetErrno(ENOENT);
    ZIPFS_ERROR(interp,Tcl_PosixError(interp));
    return TCL_ERROR;
#else
    Tcl_Obj *altPath = NULL;
    int ret = TCL_ERROR;

    if (Tcl_FSAccess(path, R_OK) == 0) {
        /*
         * EXDEV should trigger loading by copying to temp store.
         */

        Tcl_SetErrno(EXDEV);
        ZIPFS_ERROR(interp,Tcl_PosixError(interp));
        return ret;
    } else {
        Tcl_Obj *objs[2] = { NULL, NULL };

        objs[1] = TclPathPart(interp, path, TCL_PATH_DIRNAME);
        if ((objs[1] != NULL) && (Zip_FSAccessProc(objs[1], R_OK) == 0)) {
            const char *execName = Tcl_GetNameOfExecutable();

            /*
             * Shared object is not in ZIP but its path prefix is,
             * thus try to load from directory where the executable
             * came from.
             */
            TclDecrRefCount(objs[1]);
            objs[1] = TclPathPart(interp, path, TCL_PATH_TAIL);
            /*
             * Get directory name of executable manually to deal
             * with cases where [file dirname [info nameofexecutable]]
             * is equal to [info nameofexecutable] due to VFS effects.
             */
            if (execName != NULL) {
                const char *p = strrchr(execName, '/');

                if (p > execName + 1) {
                    --p;
                    objs[0] = Tcl_NewStringObj(execName, p - execName);
                }
            }
            if (objs[0] == NULL) {
                objs[0] = TclPathPart(interp, TclGetObjNameOfExecutable(),
                                          TCL_PATH_DIRNAME);
            }
            if (objs[0] != NULL) {
                altPath = TclJoinPath(2, objs);
                if (altPath != NULL) {
                    Tcl_IncrRefCount(altPath);
                    if (Tcl_FSAccess(altPath, R_OK) == 0) {
                        path = altPath;
                    }
                }
            }
        }
        if (objs[0] != NULL) {
            Tcl_DecrRefCount(objs[0]);
        }
        if (objs[1] != NULL) {
            Tcl_DecrRefCount(objs[1]);
        }
    }
    loadFileProc = (Tcl_FSLoadFileProc2 *) tclNativeFilesystem.loadFileProc;
    if (loadFileProc != NULL) {
        ret = loadFileProc(interp, path, loadHandle, unloadProcPtr, flags);
    } else {
        Tcl_SetErrno(ENOENT);
        ZIPFS_ERROR(interp,Tcl_PosixError(interp));
    }
    if (altPath != NULL) {
        Tcl_DecrRefCount(altPath);
    }
    return ret;
#endif
}


/*
 * Define the ZIP filesystem dispatch table.
 */

MODULE_SCOPE const Tcl_Filesystem zipfsFilesystem;

const Tcl_Filesystem zipfsFilesystem = {
    "zipfs",
    sizeof (Tcl_Filesystem),
    TCL_FILESYSTEM_VERSION_2,
    Zip_FSPathInFilesystemProc,
    NULL, /* dupInternalRepProc */
    NULL, /* freeInternalRepProc */
    NULL, /* internalToNormalizedProc */
    NULL, /* createInternalRepProc */
    NULL, /* normalizePathProc */
    Zip_FSFilesystemPathTypeProc,
    Zip_FSFilesystemSeparatorProc,
    Zip_FSStatProc,
    Zip_FSAccessProc,
    Zip_FSOpenFileChannelProc,
    Zip_FSMatchInDirectoryProc,
    NULL, /* utimeProc */
    NULL, /* linkProc */
    Zip_FSListVolumesProc,
    Zip_FSFileAttrStringsProc,
    Zip_FSFileAttrsGetProc,
    Zip_FSFileAttrsSetProc,
    NULL, /* createDirectoryProc */
    NULL, /* removeDirectoryProc */
    NULL, /* deleteFileProc */
    NULL, /* copyFileProc */
    NULL, /* renameFileProc */
    NULL, /* copyDirectoryProc */
    NULL, /* lstatProc */
    (Tcl_FSLoadFileProc *) Zip_FSLoadFile,
    NULL, /* getCwdProc */
    NULL, /* chdirProc*/
};

#endif /* HAVE_ZLIB */

/*
 *-------------------------------------------------------------------------
 *
 * TclZipfs_Init --
 *
 *    Perform per interpreter initialization of this module.
 *
 * Results:
 *    The return value is a standard Tcl result.
 *
 * Side effects:
 *    Initializes this module if not already initialized, and adds
 *    module related commands to the given interpreter.
 *
 *-------------------------------------------------------------------------
 */

MODULE_SCOPE int
TclZipfs_Init(Tcl_Interp *interp)
{
#ifdef HAVE_ZLIB
    /* one-time initialization */
    Tcl_StaticPackage(interp, "zipfs", TclZipfs_Init, TclZipfs_Init);
    if (!ZipFS.initialized) {
    WriteLock();
#ifdef TCL_THREADS
    static const Tcl_Time t = { 0, 0 };
    /*
     * Inflate condition variable.
     */
    Tcl_MutexLock(&ZipFSMutex);
    Tcl_ConditionWait(&ZipFSCond, &ZipFSMutex, &t);
    Tcl_MutexUnlock(&ZipFSMutex);
#endif
    Tcl_FSRegister(NULL, &zipfsFilesystem);
    Tcl_InitHashTable(&ZipFS.fileHash, TCL_STRING_KEYS);
    Tcl_InitHashTable(&ZipFS.zipHash, TCL_STRING_KEYS);
    ZipFS.initialized = ZipFS.idCount = 1;
    }
    Unlock();
    if(interp != NULL) {
        static const EnsembleImplMap initMap[] = {
            {"mount",      ZipFSMountObjCmd,    NULL, NULL, NULL, 0},
            {"unmount",      ZipFSUnmountObjCmd,    NULL, NULL, NULL, 0},
            {"mkkey",      ZipFSMkKeyObjCmd,    NULL, NULL, NULL, 0},
            {"mkimg",      ZipFSMkImgObjCmd,    NULL, NULL, NULL, 0},
            {"mkzip",      ZipFSMkZipObjCmd,    NULL, NULL, NULL, 0},
            {"lmkimg",      ZipFSLMkImgObjCmd,    NULL, NULL, NULL, 0},
            {"lmkzip",      ZipFSLMkZipObjCmd,    NULL, NULL, NULL, 0},
            {"exists",      ZipFSExistsObjCmd,    NULL, NULL, NULL, 1},
            {"info",      ZipFSInfoObjCmd,    NULL, NULL, NULL, 1},
            {"list",      ZipFSListObjCmd,    NULL, NULL, NULL, 1},
            {"canonical", ZipFSCanonicalObjCmd, NULL, NULL, NULL, 1},
            {"root",      ZipFSRootObjCmd, NULL, NULL, NULL, 1},
            {"tcl_library",      ZipFSTclLibraryObjCmd,    NULL, NULL, NULL, 0},

            {NULL, NULL, NULL, NULL, NULL, 0}
        };
        static const char findproc[] =
            "namespace eval ::tcl::zipfs::zipfs {}\n"
            "proc ::tcl::zipfs::find dir {\n"
            " set result {}\n"
            " if {[catch {glob -directory $dir -tails -nocomplain * .*} list]} {\n"
            "  return $result\n"
            " }\n"
            " foreach file $list {\n"
            "  if {$file eq \".\" || $file eq \"..\"} {\n"
            "   continue\n"
            "  }\n"
            "  set file [file join $dir $file]\n"
            "  lappend result $file\n"
            "  foreach file [::tcl::zipfs::find $file] {\n"
            "   lappend result $file\n"
            "  }\n"
            " }\n"
            " return [lsort $result]\n"
            "}\n";
        Tcl_EvalEx(interp, findproc, -1, TCL_EVAL_GLOBAL);
        Tcl_LinkVar(interp, "::tcl::zipfs::wrmax", (char *) &ZipFS.wrmax,TCL_LINK_INT);
        TclMakeEnsemble(interp, "zipfs", initMap);
        Tcl_PkgProvide(interp, "zipfs", "2.0");
    }
    return TCL_OK;
#else
    ZIPFS_ERROR(interp,"no zlib available");
    return TCL_ERROR;
#endif
}

#if defined(_WIN32) || defined(_WIN64)
#define LIBRARY_SIZE        64
static int
ToUtf(
    const WCHAR *wSrc,
    char *dst)
{
    char *start;

    start = dst;
    while (*wSrc != '\0') {
    dst += Tcl_UniCharToUtf(*wSrc, dst);
    wSrc++;
    }
    *dst = '\0';
    return (int) (dst - start);
}

#endif

static int TclZipfs_AppHook_FindTclInit(const char *archive){
    Tcl_Obj *vfsinitscript;
    int found;
    if(zipfs_literal_tcl_library) {
        return TCL_ERROR;
    }
    if(TclZipfs_Mount(NULL, archive, ZIPFS_ZIP_MOUNT, NULL)) {
        /* Either the file doesn't exist or it is not a zip archive */
        return TCL_ERROR;
    }
    vfsinitscript=Tcl_NewStringObj(ZIPFS_ZIP_MOUNT "/init.tcl",-1);
    Tcl_IncrRefCount(vfsinitscript);
    found=Tcl_FSAccess(vfsinitscript,F_OK);
    Tcl_DecrRefCount(vfsinitscript);
    if(found==0) {
        zipfs_literal_tcl_library=ZIPFS_ZIP_MOUNT;
        return TCL_OK;
    }
    vfsinitscript=Tcl_NewStringObj(ZIPFS_ZIP_MOUNT "/tcl_library/init.tcl",-1);
    Tcl_IncrRefCount(vfsinitscript);
    found=Tcl_FSAccess(vfsinitscript,F_OK);
    Tcl_DecrRefCount(vfsinitscript);
    if(found==0) {
        zipfs_literal_tcl_library=ZIPFS_ZIP_MOUNT "/tcl_library";
        return TCL_OK;
    }
    return TCL_ERROR;
}

#if defined(_WIN32) || defined(_WIN64)
int TclZipfs_AppHook(int *argc, TCHAR ***argv)
#else
int TclZipfs_AppHook(int *argc, char ***argv)
#endif
{
    /*
     * Tclkit_MainHook --
     * Performs the argument munging for the shell
     */
    char *archive;

    Tcl_FindExecutable(*argv[0]);
    archive=Tcl_GetNameOfExecutable();
    TclZipfs_Init(NULL);
    /*
    ** Look for init.tcl in one of the locations mounted later in this function
    */
    if(!TclZipfs_Mount(NULL, archive, ZIPFS_APP_MOUNT, NULL)) {
        int found;
        Tcl_Obj *vfsinitscript;
        vfsinitscript=Tcl_NewStringObj(ZIPFS_APP_MOUNT "/main.tcl",-1);
        Tcl_IncrRefCount(vfsinitscript);
        if(Tcl_FSAccess(vfsinitscript,F_OK)==0) {
            /* Startup script should be set before calling Tcl_AppInit */
            Tcl_SetStartupScript(vfsinitscript,NULL);
        } else {
            Tcl_DecrRefCount(vfsinitscript);
        }
        /* Set Tcl Encodings */
        if(!zipfs_literal_tcl_library) {
            vfsinitscript=Tcl_NewStringObj(ZIPFS_APP_MOUNT "/tcl_library/init.tcl",-1);
            Tcl_IncrRefCount(vfsinitscript);
            found=Tcl_FSAccess(vfsinitscript,F_OK);
            Tcl_DecrRefCount(vfsinitscript);
            if(found==TCL_OK) {
                zipfs_literal_tcl_library=ZIPFS_APP_MOUNT "/tcl_library";
                return TCL_OK;
            }
        }
    } else if (*argc>1) {
#if defined(_WIN32) || defined(_WIN64)
        Tcl_DString ds;
          strcpy(archive, Tcl_WinTCharToUtf((*argv)[1], -1, &ds));
        Tcl_DStringFree(&ds);
#else
        archive=(*argv)[1];
#endif
        if(strcmp(archive,"install")==0) {
            /* If the first argument is mkzip, run the mkzip program */
            Tcl_Obj *vfsinitscript;
            /* Run this now to ensure the file is present by the time Tcl_Main wants it */
            TclZipfs_TclLibrary();
            vfsinitscript=Tcl_NewStringObj(ZIPFS_ZIP_MOUNT "/tcl_library/install.tcl",-1);
            Tcl_IncrRefCount(vfsinitscript);
            if(Tcl_FSAccess(vfsinitscript,F_OK)==0) {
             Tcl_SetStartupScript(vfsinitscript,NULL);
            }
            return TCL_OK;
        } else {
            if(!TclZipfs_Mount(NULL, archive, ZIPFS_APP_MOUNT, NULL)) {
                int found;
                Tcl_Obj *vfsinitscript;
                vfsinitscript=Tcl_NewStringObj(ZIPFS_APP_MOUNT "/main.tcl",-1);
                Tcl_IncrRefCount(vfsinitscript);
                if(Tcl_FSAccess(vfsinitscript,F_OK)==0) {
                    /* Startup script should be set before calling Tcl_AppInit */
                    Tcl_SetStartupScript(vfsinitscript,NULL);
                } else {
                    Tcl_DecrRefCount(vfsinitscript);
                }
                /* Set Tcl Encodings */
                vfsinitscript=Tcl_NewStringObj(ZIPFS_APP_MOUNT "/tcl_library/init.tcl",-1);
                Tcl_IncrRefCount(vfsinitscript);
                found=Tcl_FSAccess(vfsinitscript,F_OK);
                Tcl_DecrRefCount(vfsinitscript);
                if(found==TCL_OK) {
                    zipfs_literal_tcl_library=ZIPFS_APP_MOUNT "/tcl_library";
                    return TCL_OK;
                }
            }
        }
    }
    return TCL_OK;
}

Tcl_Obj *TclZipfs_TclLibrary(void) {
    if(zipfs_literal_tcl_library) {
        return Tcl_NewStringObj(zipfs_literal_tcl_library,-1);
    } else {
#if defined(_WIN32) || defined(_WIN64)
        HMODULE hModule = TclWinGetTclInstance();
        WCHAR wName[MAX_PATH + LIBRARY_SIZE];
        char dllname[(MAX_PATH + LIBRARY_SIZE) * TCL_UTF_MAX];

        if (GetModuleFileNameW(hModule, wName, MAX_PATH) == 0) {
            GetModuleFileNameA(hModule, dllname, MAX_PATH);
        } else {
            ToUtf(wName, dllname);
        }
        /* Mount zip file and dll before releasing to search */
        if(TclZipfs_AppHook_FindTclInit(dllname)==TCL_OK) {
            return Tcl_NewStringObj(zipfs_literal_tcl_library,-1);
        }
#else
#ifdef CFG_RUNTIME_LIBDIR
        /* Mount zip file and dll before releasing to search */
        if(TclZipfs_AppHook_FindTclInit(CFG_RUNTIME_LIBDIR "/" CFG_RUNTIME_DLLFILE)==TCL_OK) {
            return Tcl_NewStringObj(zipfs_literal_tcl_library,-1);
        }
        if(TclZipfs_AppHook_FindTclInit(CFG_RUNTIME_LIBDIR "/" CFG_RUNTIME_ZIPFILE)==TCL_OK) {
            return Tcl_NewStringObj(zipfs_literal_tcl_library,-1);
        }
        if(TclZipfs_AppHook_FindTclInit(CFG_RUNTIME_SCRDIR "/" CFG_RUNTIME_ZIPFILE)==TCL_OK) {
            return Tcl_NewStringObj(zipfs_literal_tcl_library,-1);
        }
#endif
#endif
    }
    if(zipfs_literal_tcl_library) {
        return Tcl_NewStringObj(zipfs_literal_tcl_library,-1);
    }
    return NULL;
}


#ifndef HAVE_ZLIB

/*
 *-------------------------------------------------------------------------
 *
 * TclZipfs_Mount, TclZipfs_Unmount --
 *
 *    Dummy version when no ZLIB support available.
 *
 *-------------------------------------------------------------------------
 */

int
TclZipfs_Mount(Tcl_Interp *interp, const char *zipname, const char *mntpt,
        const char *passwd)
{
    return TclZipfs_Init(interp, 1);
}

int
TclZipfs_Unmount(Tcl_Interp *interp, const char *zipname)
{
    return TclZipfs_Init(interp, 1);
}

#endif

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

    if {[file exists $zipfs]} {
      $TCLOBJ define set tip_430 1
      my define set tip_430 1
    } else {
      # The Tclconfig project maintains a mirror of the version
      # released with the Tcl core
      my define set tip_430 0
      ::practcl::LOCAL tool tclconfig unpack
      set COMPATSRCROOT [::practcl::LOCAL tool tclconfig define get srcdir]
      my add class csource ofile tclZipfs.o filename [file join $COMPATSRCROOT compat tclZipfs.c] extra -I[::practcl::file_relative $CWD [file join $TCLSRCDIR compat zlib contrib minizip]]
    }

    my define add include_dir [file join $TCLSRCDIR generic]
    my define add include_dir [file join $TCLSRCDIR $PLATFORM_SRC_DIR]
    # This file will implement TCL_LOCAL_APPINIT and TCL_LOCAL_MAIN_HOOK
    my build-tclkit_main $PROJECT $PKG_OBJS

# tcl.m4 --
#
#	This file provides a set of autoconf macros to help TEA-enable
#	a Tcl extension.
#
# Copyright (c) 1999-2000 Ajuba Solutions.
# Copyright (c) 2002-2005 ActiveState Corporation.
# Copyright (c) 2012-2018 Sean Woods.
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.

AC_PREREQ(2.57)

dnl TEA extensions pass us the version of TEA they think they
dnl are compatible with (must be set in TEA_INIT below)
dnl TEA_VERSION="4.0"

# Possible values for key variables defined:
#
# TEA_WINDOWINGSYSTEM - win32 aqua x11 (mirrors 'tk windowingsystem')
# PRACTCL_WINDOWINGSYSTEM - windows cocoa hitheme x11 sdl
# TEA_PLATFORM        - windows unix
# TEA_TK_EXTENSION    - True if this is a Tk extension