/*

 * Copyright (c) 1995-1997 Sam Leffler

 * Copyright (c) 1995-1997 Silicon Graphics, Inc.

 *

 * Permission to use, copy, modify, distribute, and sell this software and

 * its documentation for any purpose is hereby granted without fee, provided

 * that (i) the above copyright notices and this permission notice appear in

 * all copies of the software and related documentation, and (ii) the names of

 * Sam Leffler and Silicon Graphics may not be used in any advertising or

 * publicity relating to the software without the specific, prior written

 * permission of Sam Leffler and Silicon Graphics.

 *

 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,

 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY

 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

 *

 * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR

 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,

 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,

 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF

 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE

 * OF THIS SOFTWARE.

 */

#include "tiffiop.h"

#ifdef ZIP_SUPPORT

/*

 * TIFF Library.

 *

 * ZIP (aka Deflate) Compression Support

 *

 * This file is an interface to the zlib library written by

 * Jean-loup Gailly and Mark Adler.  You must use version 1.0 or later

 * of the library.

 *

 * Optionally, libdeflate (https://github.com/ebiggers/libdeflate) may be used

 * to do the compression and decompression, but only for whole strips and tiles.

 * For scanline access, zlib will be sued as a fallback.

 */

#include "tif_predict.h"

#include "zlib.h"

#if LIBDEFLATE_SUPPORT

#include "libdeflate.h"

#endif

#define LIBDEFLATE_MAX_COMPRESSION_LEVEL 12

#include <stdio.h>

/*

 * Sigh, ZLIB_VERSION is defined as a string so there's no

 * way to do a proper check here.  Instead we guess based

 * on the presence of #defines that were added between the

 * 0.95 and 1.0 distributions.

 */

#if !defined(Z_NO_COMPRESSION) || !defined(Z_DEFLATED)

#error "Antiquated ZLIB software; you must use version 1.0 or later"

#endif

#define SAFE_MSG(sp) ((sp)->stream.msg == NULL ? "" : (sp)->stream.msg)

/*

 * State block for each open TIFF

 * file using ZIP compression/decompression.

 */

typedef struct

{

    TIFFPredictorState predict;

    z_stream stream;

    int zipquality; /* compression level */

    int state;      /* state flags */

    int subcodec;   /* DEFLATE_SUBCODEC_ZLIB or DEFLATE_SUBCODEC_LIBDEFLATE */

#if LIBDEFLATE_SUPPORT

    int libdeflate_state; /* -1 = until first time ZIPEncode() / ZIPDecode() is

                             called, 0 = use zlib, 1 = use libdeflate */

    struct libdeflate_decompressor *libdeflate_dec;

    struct libdeflate_compressor *libdeflate_enc;

#endif

#define ZSTATE_INIT_DECODE 0x01

#define ZSTATE_INIT_ENCODE 0x02

    TIFFVGetMethod vgetparent; /* super-class method */

    TIFFVSetMethod vsetparent; /* super-class method */

} ZIPState;

#define GetZIPState(tif) ((ZIPState *)(tif)->tif_data)

#define ZIPDecoderState(tif) GetZIPState(tif)

#define ZIPEncoderState(tif) GetZIPState(tif)

static int ZIPEncode(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s);

static int ZIPDecode(TIFF *tif, uint8_t *op, tmsize_t occ, uint16_t s);

static int ZIPFixupTags(TIFF *tif)

{

    (void)tif;

    return (1);

}

static int ZIPSetupDecode(TIFF *tif)

{

    static const char module[] = "ZIPSetupDecode";

    ZIPState *sp = ZIPDecoderState(tif);

    assert(sp != NULL);

    /* if we were last encoding, terminate this mode */

    if (sp->state & ZSTATE_INIT_ENCODE)

    {

        deflateEnd(&sp->stream);

        sp->state = 0;

    }

    /* This function can possibly be called several times by */

    /* PredictorSetupDecode() if this function succeeds but */

    /* PredictorSetup() fails */

    if ((sp->state & ZSTATE_INIT_DECODE) == 0 &&

        inflateInit(&sp->stream) != Z_OK)

    {

        TIFFErrorExtR(tif, module, "%s", SAFE_MSG(sp));

        return (0);

    }

    else

    {

        sp->state |= ZSTATE_INIT_DECODE;

        return (1);

    }

}

/*

 * Setup state for decoding a strip.

 */

static int ZIPPreDecode(TIFF *tif, uint16_t s)

{

    ZIPState *sp = ZIPDecoderState(tif);

    (void)s;

    assert(sp != NULL);

    if ((sp->state & ZSTATE_INIT_DECODE) == 0)

        tif->tif_setupdecode(tif);

#if LIBDEFLATE_SUPPORT

    sp->libdeflate_state = -1;

#endif

    sp->stream.next_in = tif->tif_rawdata;

    assert(sizeof(sp->stream.avail_in) == 4); /* if this assert gets raised,

         we need to simplify this code to reflect a ZLib that is likely updated

         to deal with 8byte memory sizes, though this code will respond

         appropriately even before we simplify it */

    sp->stream.avail_in = (uint64_t)tif->tif_rawcc < 0xFFFFFFFFU

                              ? (uInt)tif->tif_rawcc

                              : 0xFFFFFFFFU;

    return (inflateReset(&sp->stream) == Z_OK);

}

static int ZIPDecode(TIFF *tif, uint8_t *op, tmsize_t occ, uint16_t s)

{

    static const char module[] = "ZIPDecode";

    ZIPState *sp = ZIPDecoderState(tif);

    (void)s;

    assert(sp != NULL);

    assert(sp->state == ZSTATE_INIT_DECODE);

#if LIBDEFLATE_SUPPORT

    if (sp->libdeflate_state == 1)

        return 0;

    /* If we have libdeflate support and we are asked to read a whole */

    /* strip/tile, then go for using it */

    do

    {

        TIFFDirectory *td = &tif->tif_dir;

        if (sp->libdeflate_state == 0)

            break;

        if (sp->subcodec == DEFLATE_SUBCODEC_ZLIB)

            break;

        /* Check if we are in the situation where we can use libdeflate */

        if (isTiled(tif))

        {

            if (TIFFTileSize64(tif) != (uint64_t)occ)

                break;

        }

        else

        {

            uint32_t strip_height = td->td_imagelength - tif->tif_row;

            if (strip_height > td->td_rowsperstrip)

                strip_height = td->td_rowsperstrip;

            if (TIFFVStripSize64(tif, strip_height) != (uint64_t)occ)

                break;

        }

        /* Check for overflow */

        if ((size_t)tif->tif_rawcc != (uint64_t)tif->tif_rawcc)

            break;

        if ((size_t)occ != (uint64_t)occ)

            break;

        /* Go for decompression using libdeflate */

        {

            enum libdeflate_result res;

            if (sp->libdeflate_dec == NULL)

            {

                sp->libdeflate_dec = libdeflate_alloc_decompressor();

                if (sp->libdeflate_dec == NULL)

                {

                    break;

                }

            }

            sp->libdeflate_state = 1;

            res = libdeflate_zlib_decompress(sp->libdeflate_dec, tif->tif_rawcp,

                                             (size_t)tif->tif_rawcc, op,

                                             (size_t)occ, NULL);

            tif->tif_rawcp += tif->tif_rawcc;

            tif->tif_rawcc = 0;

            /* We accept LIBDEFLATE_INSUFFICIENT_SPACE has a return */

            /* There are odd files in the wild where the last strip, when */

            /* it is smaller in height than td_rowsperstrip, actually contains

             */

            /* data for td_rowsperstrip lines. Just ignore that silently. */

            if (res != LIBDEFLATE_SUCCESS &&

                res != LIBDEFLATE_INSUFFICIENT_SPACE)

            {

                TIFFErrorExtR(tif, module, "Decoding error at scanline %lu",

                              (unsigned long)tif->tif_row);

                return 0;

            }

            return 1;

        }

    } while (0);

    sp->libdeflate_state = 0;

#endif /* LIBDEFLATE_SUPPORT */

    sp->stream.next_in = tif->tif_rawcp;

    sp->stream.next_out = op;

    assert(sizeof(sp->stream.avail_out) == 4); /* if this assert gets raised,

         we need to simplify this code to reflect a ZLib that is likely updated

         to deal with 8byte memory sizes, though this code will respond

         appropriately even before we simplify it */

    do

    {

        int state;

        uInt avail_in_before = (uint64_t)tif->tif_rawcc <= 0xFFFFFFFFU

                                   ? (uInt)tif->tif_rawcc

                                   : 0xFFFFFFFFU;

        uInt avail_out_before =

            (uint64_t)occ < 0xFFFFFFFFU ? (uInt)occ : 0xFFFFFFFFU;

        sp->stream.avail_in = avail_in_before;

        sp->stream.avail_out = avail_out_before;

        /* coverity[overrun-buffer-arg] */

        state = inflate(&sp->stream, Z_PARTIAL_FLUSH);

        tif->tif_rawcc -= (avail_in_before - sp->stream.avail_in);

        occ -= (avail_out_before - sp->stream.avail_out);

        if (state == Z_STREAM_END)

            break;

        if (state == Z_DATA_ERROR)

        {

            TIFFErrorExtR(tif, module, "Decoding error at scanline %lu, %s",

                          (unsigned long)tif->tif_row, SAFE_MSG(sp));

            return (0);

        }

        if (state != Z_OK)

        {

            TIFFErrorExtR(tif, module, "ZLib error: %s", SAFE_MSG(sp));

            return (0);

        }

    } while (occ > 0);

    if (occ != 0)

    {

        TIFFErrorExtR(tif, module,

                      "Not enough data at scanline %lu (short %" PRIu64

                      " bytes)",

                      (unsigned long)tif->tif_row, (uint64_t)occ);

        return (0);

    }

    tif->tif_rawcp = sp->stream.next_in;

    return (1);

}

static int ZIPSetupEncode(TIFF *tif)

{

    static const char module[] = "ZIPSetupEncode";

    ZIPState *sp = ZIPEncoderState(tif);

    int cappedQuality;

    assert(sp != NULL);

    if (sp->state & ZSTATE_INIT_DECODE)

    {

        inflateEnd(&sp->stream);

        sp->state = 0;

    }

    cappedQuality = sp->zipquality;

    if (cappedQuality > Z_BEST_COMPRESSION)

        cappedQuality = Z_BEST_COMPRESSION;

    if (deflateInit(&sp->stream, cappedQuality) != Z_OK)

    {

        TIFFErrorExtR(tif, module, "%s", SAFE_MSG(sp));

        return (0);

    }

    else

    {

        sp->state |= ZSTATE_INIT_ENCODE;

        return (1);

    }

}

/*

 * Reset encoding state at the start of a strip.

 */

static int ZIPPreEncode(TIFF *tif, uint16_t s)

{

    ZIPState *sp = ZIPEncoderState(tif);

    (void)s;

    assert(sp != NULL);

    if (sp->state != ZSTATE_INIT_ENCODE)

        tif->tif_setupencode(tif);

#if LIBDEFLATE_SUPPORT

    sp->libdeflate_state = -1;

#endif

    sp->stream.next_out = tif->tif_rawdata;

    assert(sizeof(sp->stream.avail_out) == 4); /* if this assert gets raised,

         we need to simplify this code to reflect a ZLib that is likely updated

         to deal with 8byte memory sizes, though this code will respond

         appropriately even before we simplify it */

    sp->stream.avail_out = (uint64_t)tif->tif_rawdatasize <= 0xFFFFFFFFU

                               ? (uInt)tif->tif_rawdatasize

                               : 0xFFFFFFFFU;

    return (deflateReset(&sp->stream) == Z_OK);

}

/*

 * Encode a chunk of pixels.

 */

static int ZIPEncode(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)

{

    static const char module[] = "ZIPEncode";

    ZIPState *sp = ZIPEncoderState(tif);

    assert(sp != NULL);

    assert(sp->state == ZSTATE_INIT_ENCODE);

    (void)s;

#if LIBDEFLATE_SUPPORT

    if (sp->libdeflate_state == 1)

        return 0;

    /* If we have libdeflate support and we are asked to write a whole */

    /* strip/tile, then go for using it */

    do

    {

        TIFFDirectory *td = &tif->tif_dir;

        if (sp->libdeflate_state == 0)

            break;

        if (sp->subcodec == DEFLATE_SUBCODEC_ZLIB)

            break;

        /* Libdeflate does not support the 0-compression level */

        if (sp->zipquality == Z_NO_COMPRESSION)

            break;

        /* Check if we are in the situation where we can use libdeflate */

        if (isTiled(tif))

        {

            if (TIFFTileSize64(tif) != (uint64_t)cc)

                break;

        }

        else

        {

            uint32_t strip_height = td->td_imagelength - tif->tif_row;

            if (strip_height > td->td_rowsperstrip)

                strip_height = td->td_rowsperstrip;

            if (TIFFVStripSize64(tif, strip_height) != (uint64_t)cc)

                break;

        }

        /* Check for overflow */

        if ((size_t)tif->tif_rawdatasize != (uint64_t)tif->tif_rawdatasize)

            break;

        if ((size_t)cc != (uint64_t)cc)

            break;

        /* Go for compression using libdeflate */

        {

            size_t nCompressedBytes;

            if (sp->libdeflate_enc == NULL)

            {

                /* To get results as good as zlib, we asked for an extra */

                /* level of compression */

                sp->libdeflate_enc = libdeflate_alloc_compressor(

                    sp->zipquality == Z_DEFAULT_COMPRESSION ? 7

                    : sp->zipquality >= 6 && sp->zipquality <= 9

                        ? sp->zipquality + 1

                        : sp->zipquality);

                if (sp->libdeflate_enc == NULL)

                {

                    TIFFErrorExtR(tif, module, "Cannot allocate compressor");

                    break;

                }

            }

            /* Make sure the output buffer is large enough for the worse case.

             */

            /* In TIFFWriteBufferSetup(), when libtiff allocates the buffer */

            /* we've taken a 10% margin over the uncompressed size, which should

             */

            /* be large enough even for the the worse case scenario. */

            if (libdeflate_zlib_compress_bound(sp->libdeflate_enc, (size_t)cc) >

                (size_t)tif->tif_rawdatasize)

            {

                break;

            }

            sp->libdeflate_state = 1;

            nCompressedBytes = libdeflate_zlib_compress(

                sp->libdeflate_enc, bp, (size_t)cc, tif->tif_rawdata,

                (size_t)tif->tif_rawdatasize);

            if (nCompressedBytes == 0)

            {

                TIFFErrorExtR(tif, module, "Encoder error at scanline %lu",

                              (unsigned long)tif->tif_row);

                return 0;

            }

            tif->tif_rawcc = nCompressedBytes;

            if (!TIFFFlushData1(tif))

                return 0;

            return 1;

        }

    } while (0);

    sp->libdeflate_state = 0;

#endif /* LIBDEFLATE_SUPPORT */

    sp->stream.next_in = bp;

    assert(sizeof(sp->stream.avail_in) == 4); /* if this assert gets raised,

         we need to simplify this code to reflect a ZLib that is likely updated

         to deal with 8byte memory sizes, though this code will respond

         appropriately even before we simplify it */

    do

    {

        uInt avail_in_before =

            (uint64_t)cc <= 0xFFFFFFFFU ? (uInt)cc : 0xFFFFFFFFU;

        sp->stream.avail_in = avail_in_before;

        /* coverity[overrun-buffer-arg] */

        if (deflate(&sp->stream, Z_NO_FLUSH) != Z_OK)

        {

            TIFFErrorExtR(tif, module, "Encoder error: %s", SAFE_MSG(sp));

            return (0);

        }

        if (sp->stream.avail_out == 0)

        {

            tif->tif_rawcc = tif->tif_rawdatasize;

            if (!TIFFFlushData1(tif))

                return 0;

            sp->stream.next_out = tif->tif_rawdata;

            sp->stream.avail_out = (uint64_t)tif->tif_rawdatasize <= 0xFFFFFFFFU

                                       ? (uInt)tif->tif_rawdatasize

                                       : 0xFFFFFFFFU;

        }

        cc -= (avail_in_before - sp->stream.avail_in);

    } while (cc > 0);

    return (1);

}

/*

 * Finish off an encoded strip by flushing the last

 * string and tacking on an End Of Information code.

 */

static int ZIPPostEncode(TIFF *tif)

{

    static const char module[] = "ZIPPostEncode";

    ZIPState *sp = ZIPEncoderState(tif);

    int state;

#if LIBDEFLATE_SUPPORT

    if (sp->libdeflate_state == 1)

        return 1;

#endif

    sp->stream.avail_in = 0;

    do

    {

        state = deflate(&sp->stream, Z_FINISH);

        switch (state)

        {

            case Z_STREAM_END:

            case Z_OK:

                if ((tmsize_t)sp->stream.avail_out != tif->tif_rawdatasize)

                {

                    tif->tif_rawcc =

                        tif->tif_rawdatasize - sp->stream.avail_out;

                    if (!TIFFFlushData1(tif))

                        return 0;

                    sp->stream.next_out = tif->tif_rawdata;

                    sp->stream.avail_out =

                        (uint64_t)tif->tif_rawdatasize <= 0xFFFFFFFFU

                            ? (uInt)tif->tif_rawdatasize

                            : 0xFFFFFFFFU;

                }

                break;

            default:

                TIFFErrorExtR(tif, module, "ZLib error: %s", SAFE_MSG(sp));

                return (0);

        }

    } while (state != Z_STREAM_END);

    return (1);

}

static void ZIPCleanup(TIFF *tif)

{

    ZIPState *sp = GetZIPState(tif);

    assert(sp != 0);

    (void)TIFFPredictorCleanup(tif);

    tif->tif_tagmethods.vgetfield = sp->vgetparent;

    tif->tif_tagmethods.vsetfield = sp->vsetparent;

    if (sp->state & ZSTATE_INIT_ENCODE)

    {

        deflateEnd(&sp->stream);

        sp->state = 0;

    }

    else if (sp->state & ZSTATE_INIT_DECODE)

    {

        inflateEnd(&sp->stream);

        sp->state = 0;

    }

#if LIBDEFLATE_SUPPORT

    if (sp->libdeflate_dec)

        libdeflate_free_decompressor(sp->libdeflate_dec);

    if (sp->libdeflate_enc)

        libdeflate_free_compressor(sp->libdeflate_enc);

#endif

    _TIFFfreeExt(tif, sp);

    tif->tif_data = NULL;

    _TIFFSetDefaultCompressionState(tif);

}

static int ZIPVSetField(TIFF *tif, uint32_t tag, va_list ap)

{

    static const char module[] = "ZIPVSetField";

    ZIPState *sp = GetZIPState(tif);

    switch (tag)

    {

        case TIFFTAG_ZIPQUALITY:

            sp->zipquality = (int)va_arg(ap, int);

            if (sp->zipquality < Z_DEFAULT_COMPRESSION ||

                sp->zipquality > LIBDEFLATE_MAX_COMPRESSION_LEVEL)

            {

                TIFFErrorExtR(

                    tif, module,

                    "Invalid ZipQuality value. Should be in [-1,%d] range",

                    LIBDEFLATE_MAX_COMPRESSION_LEVEL);

                return 0;

            }

            if (sp->state & ZSTATE_INIT_ENCODE)

            {

                int cappedQuality = sp->zipquality;

                if (cappedQuality > Z_BEST_COMPRESSION)

                    cappedQuality = Z_BEST_COMPRESSION;

                if (deflateParams(&sp->stream, cappedQuality,

                                  Z_DEFAULT_STRATEGY) != Z_OK)

                {

                    TIFFErrorExtR(tif, module, "ZLib error: %s", SAFE_MSG(sp));

                    return (0);

                }

            }

#if LIBDEFLATE_SUPPORT

            if (sp->libdeflate_enc)

            {

                libdeflate_free_compressor(sp->libdeflate_enc);

                sp->libdeflate_enc = NULL;

            }

#endif

            return (1);

        case TIFFTAG_DEFLATE_SUBCODEC:

            sp->subcodec = (int)va_arg(ap, int);

            if (sp->subcodec != DEFLATE_SUBCODEC_ZLIB &&

                sp->subcodec != DEFLATE_SUBCODEC_LIBDEFLATE)

            {

                TIFFErrorExtR(tif, module, "Invalid DeflateCodec value.");

                return 0;

            }

#if !LIBDEFLATE_SUPPORT

            if (sp->subcodec == DEFLATE_SUBCODEC_LIBDEFLATE)

            {

                TIFFErrorExtR(tif, module,

                              "DeflateCodec = DEFLATE_SUBCODEC_LIBDEFLATE "

                              "unsupported in this build");

                return 0;

            }

#endif

            return 1;

        default:

            return (*sp->vsetparent)(tif, tag, ap);

    }

    /*NOTREACHED*/

}

static int ZIPVGetField(TIFF *tif, uint32_t tag, va_list ap)

{

    ZIPState *sp = GetZIPState(tif);

    switch (tag)

    {

        case TIFFTAG_ZIPQUALITY:

            *va_arg(ap, int *) = sp->zipquality;

            break;

        case TIFFTAG_DEFLATE_SUBCODEC:

            *va_arg(ap, int *) = sp->subcodec;

            break;

        default:

            return (*sp->vgetparent)(tif, tag, ap);

    }

    return (1);

}

static const TIFFField zipFields[] = {

    {TIFFTAG_ZIPQUALITY, 0, 0, TIFF_ANY, 0, TIFF_SETGET_INT,

     TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "", NULL},

    {TIFFTAG_DEFLATE_SUBCODEC, 0, 0, TIFF_ANY, 0, TIFF_SETGET_INT,

     TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "", NULL},

};

int TIFFInitZIP(TIFF *tif, int scheme)

{

    static const char module[] = "TIFFInitZIP";

    ZIPState *sp;

    assert((scheme == COMPRESSION_DEFLATE) ||

           (scheme == COMPRESSION_ADOBE_DEFLATE));

#ifdef NDEBUG

    (void)scheme;

#endif

    /*

     * Merge codec-specific tag information.

     */

    if (!_TIFFMergeFields(tif, zipFields, TIFFArrayCount(zipFields)))

    {

        TIFFErrorExtR(tif, module,

                      "Merging Deflate codec-specific tags failed");

        return 0;

    }

    /*

     * Allocate state block so tag methods have storage to record values.

     */

    tif->tif_data = (uint8_t *)_TIFFcallocExt(tif, sizeof(ZIPState), 1);

    if (tif->tif_data == NULL)

        goto bad;

    sp = GetZIPState(tif);

    sp->stream.zalloc = NULL;

    sp->stream.zfree = NULL;

    sp->stream.opaque = NULL;

    sp->stream.data_type = Z_BINARY;

    /*

     * Override parent get/set field methods.

     */

    sp->vgetparent = tif->tif_tagmethods.vgetfield;

    tif->tif_tagmethods.vgetfield = ZIPVGetField; /* hook for codec tags */

    sp->vsetparent = tif->tif_tagmethods.vsetfield;

    tif->tif_tagmethods.vsetfield = ZIPVSetField; /* hook for codec tags */

    /* Default values for codec-specific fields */

    sp->zipquality = Z_DEFAULT_COMPRESSION; /* default comp. level */

    sp->state = 0;

#if LIBDEFLATE_SUPPORT

    sp->subcodec = DEFLATE_SUBCODEC_LIBDEFLATE;

#else

    sp->subcodec = DEFLATE_SUBCODEC_ZLIB;

#endif

    /*

     * Install codec methods.

     */

    tif->tif_fixuptags = ZIPFixupTags;

    tif->tif_setupdecode = ZIPSetupDecode;

    tif->tif_predecode = ZIPPreDecode;

    tif->tif_decoderow = ZIPDecode;

    tif->tif_decodestrip = ZIPDecode;

    tif->tif_decodetile = ZIPDecode;

    tif->tif_setupencode = ZIPSetupEncode;

    tif->tif_preencode = ZIPPreEncode;

    tif->tif_postencode = ZIPPostEncode;

    tif->tif_encoderow = ZIPEncode;

    tif->tif_encodestrip = ZIPEncode;

    tif->tif_encodetile = ZIPEncode;

    tif->tif_cleanup = ZIPCleanup;

    /*

     * Setup predictor setup.

     */

    (void)TIFFPredictorInit(tif);

    return (1);

bad:

    TIFFErrorExtR(tif, module, "No space for ZIP state block");

    return (0);

}

#endif /* ZIP_SUPPORT */