/*

 * 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 ZState(tif)             ((ZIPState*) (tif)->tif_data)

#define DecoderState(tif)       ZState(tif)

#define EncoderState(tif)       ZState(tif)

static int ZIPEncode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s);

static int ZIPDecode(TIFF* tif, uint8* op, tmsize_t occ, uint16 s);

static int

ZIPFixupTags(TIFF* tif)

{

  (void) tif;

  return (1);

}

static int

ZIPSetupDecode(TIFF* tif)

{

  static const char module[] = "ZIPSetupDecode";

  ZIPState* sp = DecoderState(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) {

    TIFFErrorExt(tif->tif_clientdata, 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 s)

{

  ZIPState* sp = DecoderState(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)tif->tif_rawcc < 0xFFFFFFFFU ? (uInt) tif->tif_rawcc : 0xFFFFFFFFU;

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

}

static int

ZIPDecode(TIFF* tif, uint8* op, tmsize_t occ, uint16 s)

{

  static const char module[] = "ZIPDecode";

  ZIPState* sp = DecoderState(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)occ )

                    break;

            } else {

                uint32 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)occ )

                    break;

            }

            /* Check for overflow */

            if( (size_t)tif->tif_rawcc != (uint64)tif->tif_rawcc )

                break;

            if( (size_t)occ != (uint64)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 )

                {

                    TIFFErrorExt(tif->tif_clientdata, 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)tif->tif_rawcc <= 0xFFFFFFFFU ? (uInt)tif->tif_rawcc : 0xFFFFFFFFU;

                uInt avail_out_before = (uint64)occ < 0xFFFFFFFFU ? (uInt) occ : 0xFFFFFFFFU;

                sp->stream.avail_in = avail_in_before;

                sp->stream.avail_out = avail_out_before;

    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) {

      TIFFErrorExt(tif->tif_clientdata, module,

          "Decoding error at scanline %lu, %s",

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

      return (0);

    }

    if (state != Z_OK) {

      TIFFErrorExt(tif->tif_clientdata, module, 

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

      return (0);

    }

  } while (occ > 0);

  if (occ != 0) {

    TIFFErrorExt(tif->tif_clientdata, module,

        "Not enough data at scanline %lu (short " TIFF_UINT64_FORMAT " bytes)",

        (unsigned long) tif->tif_row, (TIFF_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 = EncoderState(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) {

    TIFFErrorExt(tif->tif_clientdata, 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 s)

{

  ZIPState *sp = EncoderState(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)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* bp, tmsize_t cc, uint16 s)

{

  static const char module[] = "ZIPEncode";

  ZIPState *sp = EncoderState(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)cc )

                    break;

            } else {

                uint32 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)cc )

                    break;

            }

            /* Check for overflow */

            if( (size_t)tif->tif_rawdatasize != (uint64)tif->tif_rawdatasize )

                break;

            if( (size_t)cc != (uint64)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 )

                    {

                        TIFFErrorExt(tif->tif_clientdata, 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 )

                {

                    TIFFErrorExt(tif->tif_clientdata, 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)cc <= 0xFFFFFFFFU ? (uInt)cc : 0xFFFFFFFFU;

                sp->stream.avail_in = avail_in_before;

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

      TIFFErrorExt(tif->tif_clientdata, 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)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 = EncoderState(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)tif->tif_rawdatasize <= 0xFFFFFFFFU ? (uInt)tif->tif_rawdatasize : 0xFFFFFFFFU;

      }

      break;

    default:

      TIFFErrorExt(tif->tif_clientdata, module, 

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

      return (0);

    }

  } while (state != Z_STREAM_END);

  return (1);

}

static void

ZIPCleanup(TIFF* tif)

{

  ZIPState* sp = ZState(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

  _TIFFfree(sp);

  tif->tif_data = NULL;

  _TIFFSetDefaultCompressionState(tif);

}

static int

ZIPVSetField(TIFF* tif, uint32 tag, va_list ap)

{

  static const char module[] = "ZIPVSetField";

  ZIPState* sp = ZState(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 ) {

                    TIFFErrorExt(tif->tif_clientdata, 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) {

        TIFFErrorExt(tif->tif_clientdata, 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 )

                {

                    TIFFErrorExt(tif->tif_clientdata, module,

                                 "Invalid DeflateCodec value.");

                    return 0;

                }

#if !LIBDEFLATE_SUPPORT

                if( sp->subcodec == DEFLATE_SUBCODEC_LIBDEFLATE )

                {

                    TIFFErrorExt(tif->tif_clientdata, 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 tag, va_list ap)

{

  ZIPState* sp = ZState(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))) {

    TIFFErrorExt(tif->tif_clientdata, module,

           "Merging Deflate codec-specific tags failed");

    return 0;

  }

  /*

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

   */

  tif->tif_data = (uint8*) _TIFFcalloc(sizeof (ZIPState), 1);

  if (tif->tif_data == NULL)

    goto bad;

  sp = ZState(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:

  TIFFErrorExt(tif->tif_clientdata, module,

         "No space for ZIP state block");

  return (0);

}

#endif /* ZIP_SUPPORT */

/* vim: set ts=8 sts=8 sw=8 noet: */

/*

 * Local Variables:

 * mode: c

 * c-basic-offset: 8

 * fill-column: 78

 * End:

 */