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700 lines
22 KiB
700 lines
22 KiB
/* |
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* Copyright (c) 1995-1997 Sam Leffler |
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* Copyright (c) 1995-1997 Silicon Graphics, Inc. |
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* |
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* Permission to use, copy, modify, distribute, and sell this software and |
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* its documentation for any purpose is hereby granted without fee, provided |
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* that (i) the above copyright notices and this permission notice appear in |
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* all copies of the software and related documentation, and (ii) the names of |
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* Sam Leffler and Silicon Graphics may not be used in any advertising or |
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* publicity relating to the software without the specific, prior written |
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* permission of Sam Leffler and Silicon Graphics. |
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* |
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* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, |
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* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY |
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* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. |
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* |
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* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR |
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* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, |
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* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, |
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* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF |
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* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE |
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* OF THIS SOFTWARE. |
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*/ |
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|
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#include "tiffiop.h" |
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#ifdef ZIP_SUPPORT |
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/* |
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* TIFF Library. |
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* |
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* ZIP (aka Deflate) Compression Support |
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* |
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* This file is an interface to the zlib library written by |
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* Jean-loup Gailly and Mark Adler. You must use version 1.0 or later |
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* of the library. |
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* |
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* Optionally, libdeflate (https://github.com/ebiggers/libdeflate) may be used |
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* to do the compression and decompression, but only for whole strips and tiles. |
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* For scanline access, zlib will be sued as a fallback. |
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*/ |
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#include "tif_predict.h" |
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#include "zlib.h" |
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|
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#if LIBDEFLATE_SUPPORT |
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#include "libdeflate.h" |
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#endif |
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#define LIBDEFLATE_MAX_COMPRESSION_LEVEL 12 |
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|
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#include <stdio.h> |
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|
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/* |
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* Sigh, ZLIB_VERSION is defined as a string so there's no |
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* way to do a proper check here. Instead we guess based |
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* on the presence of #defines that were added between the |
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* 0.95 and 1.0 distributions. |
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*/ |
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#if !defined(Z_NO_COMPRESSION) || !defined(Z_DEFLATED) |
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#error "Antiquated ZLIB software; you must use version 1.0 or later" |
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#endif |
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#define SAFE_MSG(sp) ((sp)->stream.msg == NULL ? "" : (sp)->stream.msg) |
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|
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/* |
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* State block for each open TIFF |
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* file using ZIP compression/decompression. |
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*/ |
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typedef struct { |
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TIFFPredictorState predict; |
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z_stream stream; |
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int zipquality; /* compression level */ |
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int state; /* state flags */ |
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int subcodec; /* DEFLATE_SUBCODEC_ZLIB or DEFLATE_SUBCODEC_LIBDEFLATE */ |
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#if LIBDEFLATE_SUPPORT |
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int libdeflate_state; /* -1 = until first time ZIPEncode() / ZIPDecode() is called, 0 = use zlib, 1 = use libdeflate */ |
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struct libdeflate_decompressor* libdeflate_dec; |
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struct libdeflate_compressor* libdeflate_enc; |
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#endif |
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#define ZSTATE_INIT_DECODE 0x01 |
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#define ZSTATE_INIT_ENCODE 0x02 |
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|
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TIFFVGetMethod vgetparent; /* super-class method */ |
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TIFFVSetMethod vsetparent; /* super-class method */ |
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} ZIPState; |
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#define ZState(tif) ((ZIPState*) (tif)->tif_data) |
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#define DecoderState(tif) ZState(tif) |
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#define EncoderState(tif) ZState(tif) |
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static int ZIPEncode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s); |
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static int ZIPDecode(TIFF* tif, uint8* op, tmsize_t occ, uint16 s); |
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|
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static int |
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ZIPFixupTags(TIFF* tif) |
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{ |
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(void) tif; |
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return (1); |
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} |
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static int |
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ZIPSetupDecode(TIFF* tif) |
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{ |
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static const char module[] = "ZIPSetupDecode"; |
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ZIPState* sp = DecoderState(tif); |
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|
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assert(sp != NULL); |
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|
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/* if we were last encoding, terminate this mode */ |
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if (sp->state & ZSTATE_INIT_ENCODE) { |
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deflateEnd(&sp->stream); |
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sp->state = 0; |
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} |
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|
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/* This function can possibly be called several times by */ |
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/* PredictorSetupDecode() if this function succeeds but */ |
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/* PredictorSetup() fails */ |
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if ((sp->state & ZSTATE_INIT_DECODE) == 0 && |
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inflateInit(&sp->stream) != Z_OK) { |
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TIFFErrorExt(tif->tif_clientdata, module, "%s", SAFE_MSG(sp)); |
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return (0); |
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} else { |
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sp->state |= ZSTATE_INIT_DECODE; |
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return (1); |
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} |
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} |
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/* |
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* Setup state for decoding a strip. |
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*/ |
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static int |
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ZIPPreDecode(TIFF* tif, uint16 s) |
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{ |
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ZIPState* sp = DecoderState(tif); |
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(void) s; |
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assert(sp != NULL); |
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if( (sp->state & ZSTATE_INIT_DECODE) == 0 ) |
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tif->tif_setupdecode( tif ); |
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#if LIBDEFLATE_SUPPORT |
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sp->libdeflate_state = -1; |
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#endif |
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sp->stream.next_in = tif->tif_rawdata; |
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assert(sizeof(sp->stream.avail_in)==4); /* if this assert gets raised, |
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we need to simplify this code to reflect a ZLib that is likely updated |
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to deal with 8byte memory sizes, though this code will respond |
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appropriately even before we simplify it */ |
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sp->stream.avail_in = (uint64)tif->tif_rawcc < 0xFFFFFFFFU ? (uInt) tif->tif_rawcc : 0xFFFFFFFFU; |
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return (inflateReset(&sp->stream) == Z_OK); |
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} |
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static int |
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ZIPDecode(TIFF* tif, uint8* op, tmsize_t occ, uint16 s) |
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{ |
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static const char module[] = "ZIPDecode"; |
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ZIPState* sp = DecoderState(tif); |
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(void) s; |
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assert(sp != NULL); |
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assert(sp->state == ZSTATE_INIT_DECODE); |
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#if LIBDEFLATE_SUPPORT |
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if( sp->libdeflate_state == 1 ) |
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return 0; |
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|
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/* If we have libdeflate support and we are asked to read a whole */ |
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/* strip/tile, then go for using it */ |
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do { |
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TIFFDirectory *td = &tif->tif_dir; |
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|
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if( sp->libdeflate_state == 0 ) |
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break; |
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if( sp->subcodec == DEFLATE_SUBCODEC_ZLIB ) |
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break; |
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|
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/* Check if we are in the situation where we can use libdeflate */ |
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if (isTiled(tif)) { |
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if( TIFFTileSize64(tif) != (uint64)occ ) |
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break; |
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} else { |
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uint32 strip_height = td->td_imagelength - tif->tif_row; |
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if (strip_height > td->td_rowsperstrip) |
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strip_height = td->td_rowsperstrip; |
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if( TIFFVStripSize64(tif, strip_height) != (uint64)occ ) |
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break; |
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} |
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|
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/* Check for overflow */ |
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if( (size_t)tif->tif_rawcc != (uint64)tif->tif_rawcc ) |
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break; |
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if( (size_t)occ != (uint64)occ ) |
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break; |
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|
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/* Go for decompression using libdeflate */ |
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{ |
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enum libdeflate_result res; |
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if( sp->libdeflate_dec == NULL ) |
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{ |
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sp->libdeflate_dec = libdeflate_alloc_decompressor(); |
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if( sp->libdeflate_dec == NULL ) |
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{ |
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break; |
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} |
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} |
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sp->libdeflate_state = 1; |
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res = libdeflate_zlib_decompress( |
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sp->libdeflate_dec, tif->tif_rawcp, (size_t)tif->tif_rawcc, op, (size_t)occ, NULL); |
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tif->tif_rawcp += tif->tif_rawcc; |
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tif->tif_rawcc = 0; |
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/* We accept LIBDEFLATE_INSUFFICIENT_SPACE has a return */ |
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/* There are odd files in the wild where the last strip, when */ |
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/* it is smaller in height than td_rowsperstrip, actually contains */ |
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/* data for td_rowsperstrip lines. Just ignore that silently. */ |
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if( res != LIBDEFLATE_SUCCESS && |
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res != LIBDEFLATE_INSUFFICIENT_SPACE ) |
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{ |
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TIFFErrorExt(tif->tif_clientdata, module, |
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"Decoding error at scanline %lu", |
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(unsigned long) tif->tif_row); |
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return 0; |
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} |
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return 1; |
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} |
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} while(0); |
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sp->libdeflate_state = 0; |
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#endif /* LIBDEFLATE_SUPPORT */ |
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sp->stream.next_in = tif->tif_rawcp; |
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sp->stream.next_out = op; |
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assert(sizeof(sp->stream.avail_out)==4); /* if this assert gets raised, |
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we need to simplify this code to reflect a ZLib that is likely updated |
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to deal with 8byte memory sizes, though this code will respond |
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appropriately even before we simplify it */ |
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do { |
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int state; |
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uInt avail_in_before = (uint64)tif->tif_rawcc <= 0xFFFFFFFFU ? (uInt)tif->tif_rawcc : 0xFFFFFFFFU; |
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uInt avail_out_before = (uint64)occ < 0xFFFFFFFFU ? (uInt) occ : 0xFFFFFFFFU; |
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sp->stream.avail_in = avail_in_before; |
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sp->stream.avail_out = avail_out_before; |
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state = inflate(&sp->stream, Z_PARTIAL_FLUSH); |
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tif->tif_rawcc -= (avail_in_before - sp->stream.avail_in); |
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occ -= (avail_out_before - sp->stream.avail_out); |
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if (state == Z_STREAM_END) |
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break; |
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if (state == Z_DATA_ERROR) { |
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TIFFErrorExt(tif->tif_clientdata, module, |
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"Decoding error at scanline %lu, %s", |
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(unsigned long) tif->tif_row, SAFE_MSG(sp)); |
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return (0); |
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} |
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if (state != Z_OK) { |
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TIFFErrorExt(tif->tif_clientdata, module, |
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"ZLib error: %s", SAFE_MSG(sp)); |
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return (0); |
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} |
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} while (occ > 0); |
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if (occ != 0) { |
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TIFFErrorExt(tif->tif_clientdata, module, |
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"Not enough data at scanline %lu (short " TIFF_UINT64_FORMAT " bytes)", |
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(unsigned long) tif->tif_row, (TIFF_UINT64_T) occ); |
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return (0); |
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} |
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tif->tif_rawcp = sp->stream.next_in; |
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return (1); |
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} |
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static int |
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ZIPSetupEncode(TIFF* tif) |
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{ |
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static const char module[] = "ZIPSetupEncode"; |
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ZIPState* sp = EncoderState(tif); |
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int cappedQuality; |
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|
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assert(sp != NULL); |
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if (sp->state & ZSTATE_INIT_DECODE) { |
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inflateEnd(&sp->stream); |
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sp->state = 0; |
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} |
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cappedQuality = sp->zipquality; |
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if( cappedQuality > Z_BEST_COMPRESSION ) |
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cappedQuality = Z_BEST_COMPRESSION; |
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if (deflateInit(&sp->stream, cappedQuality) != Z_OK) { |
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TIFFErrorExt(tif->tif_clientdata, module, "%s", SAFE_MSG(sp)); |
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return (0); |
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} else { |
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sp->state |= ZSTATE_INIT_ENCODE; |
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return (1); |
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} |
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} |
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/* |
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* Reset encoding state at the start of a strip. |
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*/ |
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static int |
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ZIPPreEncode(TIFF* tif, uint16 s) |
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{ |
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ZIPState *sp = EncoderState(tif); |
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|
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(void) s; |
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assert(sp != NULL); |
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if( sp->state != ZSTATE_INIT_ENCODE ) |
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tif->tif_setupencode( tif ); |
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#if LIBDEFLATE_SUPPORT |
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sp->libdeflate_state = -1; |
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#endif |
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sp->stream.next_out = tif->tif_rawdata; |
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assert(sizeof(sp->stream.avail_out)==4); /* if this assert gets raised, |
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we need to simplify this code to reflect a ZLib that is likely updated |
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to deal with 8byte memory sizes, though this code will respond |
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appropriately even before we simplify it */ |
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sp->stream.avail_out = (uint64)tif->tif_rawdatasize <= 0xFFFFFFFFU ? (uInt)tif->tif_rawdatasize : 0xFFFFFFFFU; |
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return (deflateReset(&sp->stream) == Z_OK); |
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} |
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/* |
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* Encode a chunk of pixels. |
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*/ |
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static int |
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ZIPEncode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) |
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{ |
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static const char module[] = "ZIPEncode"; |
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ZIPState *sp = EncoderState(tif); |
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|
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assert(sp != NULL); |
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assert(sp->state == ZSTATE_INIT_ENCODE); |
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(void) s; |
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#if LIBDEFLATE_SUPPORT |
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if( sp->libdeflate_state == 1 ) |
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return 0; |
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|
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/* If we have libdeflate support and we are asked to write a whole */ |
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/* strip/tile, then go for using it */ |
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do { |
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TIFFDirectory *td = &tif->tif_dir; |
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|
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if( sp->libdeflate_state == 0 ) |
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break; |
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if( sp->subcodec == DEFLATE_SUBCODEC_ZLIB ) |
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break; |
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/* Libdeflate does not support the 0-compression level */ |
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if( sp->zipquality == Z_NO_COMPRESSION ) |
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break; |
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|
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/* Check if we are in the situation where we can use libdeflate */ |
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if (isTiled(tif)) { |
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if( TIFFTileSize64(tif) != (uint64)cc ) |
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break; |
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} else { |
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uint32 strip_height = td->td_imagelength - tif->tif_row; |
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if (strip_height > td->td_rowsperstrip) |
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strip_height = td->td_rowsperstrip; |
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if( TIFFVStripSize64(tif, strip_height) != (uint64)cc ) |
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break; |
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} |
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|
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/* Check for overflow */ |
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if( (size_t)tif->tif_rawdatasize != (uint64)tif->tif_rawdatasize ) |
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break; |
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if( (size_t)cc != (uint64)cc ) |
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break; |
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|
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/* Go for compression using libdeflate */ |
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{ |
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size_t nCompressedBytes; |
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if( sp->libdeflate_enc == NULL ) |
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{ |
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/* To get results as good as zlib, we asked for an extra */ |
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/* level of compression */ |
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sp->libdeflate_enc = libdeflate_alloc_compressor( |
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sp->zipquality == Z_DEFAULT_COMPRESSION ? 7 : |
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sp->zipquality >= 6 && sp->zipquality <= 9 ? sp->zipquality + 1 : |
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sp->zipquality); |
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if( sp->libdeflate_enc == NULL ) |
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{ |
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TIFFErrorExt(tif->tif_clientdata, module, |
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"Cannot allocate compressor"); |
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break; |
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} |
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} |
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/* Make sure the output buffer is large enough for the worse case. */ |
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/* In TIFFWriteBufferSetup(), when libtiff allocates the buffer */ |
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/* we've taken a 10% margin over the uncompressed size, which should */ |
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/* be large enough even for the the worse case scenario. */ |
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if( libdeflate_zlib_compress_bound(sp->libdeflate_enc, (size_t)cc) > |
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(size_t)tif->tif_rawdatasize) |
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{ |
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break; |
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} |
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sp->libdeflate_state = 1; |
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nCompressedBytes = libdeflate_zlib_compress( |
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sp->libdeflate_enc, bp, (size_t)cc, tif->tif_rawdata, (size_t)tif->tif_rawdatasize); |
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|
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if( nCompressedBytes == 0 ) |
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{ |
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TIFFErrorExt(tif->tif_clientdata, module, |
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"Encoder error at scanline %lu", |
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(unsigned long) tif->tif_row); |
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return 0; |
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} |
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tif->tif_rawcc = nCompressedBytes; |
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|
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if( !TIFFFlushData1(tif) ) |
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return 0; |
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return 1; |
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} |
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} while(0); |
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sp->libdeflate_state = 0; |
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#endif /* LIBDEFLATE_SUPPORT */ |
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sp->stream.next_in = bp; |
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assert(sizeof(sp->stream.avail_in)==4); /* if this assert gets raised, |
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we need to simplify this code to reflect a ZLib that is likely updated |
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to deal with 8byte memory sizes, though this code will respond |
|
appropriately even before we simplify it */ |
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do { |
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uInt avail_in_before = (uint64)cc <= 0xFFFFFFFFU ? (uInt)cc : 0xFFFFFFFFU; |
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sp->stream.avail_in = avail_in_before; |
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if (deflate(&sp->stream, Z_NO_FLUSH) != Z_OK) { |
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TIFFErrorExt(tif->tif_clientdata, module, |
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"Encoder error: %s", |
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SAFE_MSG(sp)); |
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return (0); |
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} |
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if (sp->stream.avail_out == 0) { |
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tif->tif_rawcc = tif->tif_rawdatasize; |
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if (!TIFFFlushData1(tif)) |
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return 0; |
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sp->stream.next_out = tif->tif_rawdata; |
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sp->stream.avail_out = (uint64)tif->tif_rawdatasize <= 0xFFFFFFFFU ? (uInt)tif->tif_rawdatasize : 0xFFFFFFFFU; |
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} |
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cc -= (avail_in_before - sp->stream.avail_in); |
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} while (cc > 0); |
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return (1); |
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} |
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|
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/* |
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* Finish off an encoded strip by flushing the last |
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* string and tacking on an End Of Information code. |
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*/ |
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static int |
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ZIPPostEncode(TIFF* tif) |
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{ |
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static const char module[] = "ZIPPostEncode"; |
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ZIPState *sp = EncoderState(tif); |
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int state; |
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|
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#if LIBDEFLATE_SUPPORT |
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if( sp->libdeflate_state == 1 ) |
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return 1; |
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#endif |
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|
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sp->stream.avail_in = 0; |
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do { |
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state = deflate(&sp->stream, Z_FINISH); |
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switch (state) { |
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case Z_STREAM_END: |
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case Z_OK: |
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if ((tmsize_t)sp->stream.avail_out != tif->tif_rawdatasize) |
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{ |
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tif->tif_rawcc = tif->tif_rawdatasize - sp->stream.avail_out; |
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if (!TIFFFlushData1(tif)) |
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return 0; |
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sp->stream.next_out = tif->tif_rawdata; |
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sp->stream.avail_out = (uint64)tif->tif_rawdatasize <= 0xFFFFFFFFU ? (uInt)tif->tif_rawdatasize : 0xFFFFFFFFU; |
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} |
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break; |
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default: |
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TIFFErrorExt(tif->tif_clientdata, module, |
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"ZLib error: %s", SAFE_MSG(sp)); |
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return (0); |
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} |
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} while (state != Z_STREAM_END); |
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return (1); |
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} |
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|
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static void |
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ZIPCleanup(TIFF* tif) |
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{ |
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ZIPState* sp = ZState(tif); |
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|
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assert(sp != 0); |
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|
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(void)TIFFPredictorCleanup(tif); |
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|
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tif->tif_tagmethods.vgetfield = sp->vgetparent; |
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tif->tif_tagmethods.vsetfield = sp->vsetparent; |
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|
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if (sp->state & ZSTATE_INIT_ENCODE) { |
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deflateEnd(&sp->stream); |
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sp->state = 0; |
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} else if( sp->state & ZSTATE_INIT_DECODE) { |
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inflateEnd(&sp->stream); |
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sp->state = 0; |
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} |
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|
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#if LIBDEFLATE_SUPPORT |
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if( sp->libdeflate_dec ) |
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libdeflate_free_decompressor(sp->libdeflate_dec); |
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if( sp->libdeflate_enc ) |
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libdeflate_free_compressor(sp->libdeflate_enc); |
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#endif |
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|
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_TIFFfree(sp); |
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tif->tif_data = NULL; |
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|
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_TIFFSetDefaultCompressionState(tif); |
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} |
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|
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static int |
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ZIPVSetField(TIFF* tif, uint32 tag, va_list ap) |
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{ |
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static const char module[] = "ZIPVSetField"; |
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ZIPState* sp = ZState(tif); |
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|
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switch (tag) { |
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case TIFFTAG_ZIPQUALITY: |
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sp->zipquality = (int) va_arg(ap, int); |
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if( sp->zipquality < Z_DEFAULT_COMPRESSION || |
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sp->zipquality > LIBDEFLATE_MAX_COMPRESSION_LEVEL ) { |
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TIFFErrorExt(tif->tif_clientdata, module, |
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"Invalid ZipQuality value. Should be in [-1,%d] range", |
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LIBDEFLATE_MAX_COMPRESSION_LEVEL); |
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return 0; |
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} |
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|
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if ( sp->state&ZSTATE_INIT_ENCODE ) { |
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int cappedQuality = sp->zipquality; |
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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: |
|
*/
|
|
|