vendor: OpenCV 5.0.0 snapshot at 40738fb16ceddb5fb3fea747585f7ce6abb0605b
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/*
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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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#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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#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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#include <stdio.h>
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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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* 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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{
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TIFFPredictorState predict;
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z_stream stream;
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int read_error; /* whether a read error has occurred, and which should cause
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further reads in the same strip/tile to be aborted */
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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
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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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TIFFVGetMethod vgetparent; /* super-class method */
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TIFFVSetMethod vsetparent; /* super-class method */
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} ZIPState;
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#define GetZIPState(tif) ((ZIPState *)(tif)->tif_data)
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#define ZIPDecoderState(tif) GetZIPState(tif)
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#define ZIPEncoderState(tif) GetZIPState(tif)
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static int ZIPEncode(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s);
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static int ZIPDecode(TIFF *tif, uint8_t *op, tmsize_t occ, uint16_t s);
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static int 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 ZIPSetupDecode(TIFF *tif)
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{
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static const char module[] = "ZIPSetupDecode";
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ZIPState *sp = ZIPDecoderState(tif);
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assert(sp != NULL);
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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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{
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deflateEnd(&sp->stream);
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sp->state = 0;
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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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{
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TIFFErrorExtR(tif, module, "%s", SAFE_MSG(sp));
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return (0);
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}
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else
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{
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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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static inline uint64_t TIFF_MIN_UINT64(uint64_t a, uint64_t b)
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{
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return a < b ? a : b;
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}
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static inline uInt TIFF_CLAMP_UINT64_TO_INT32_MAX(uint64_t v)
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{
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return (uInt)TIFF_MIN_UINT64(v, INT32_MAX);
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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 ZIPPreDecode(TIFF *tif, uint16_t s)
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{
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ZIPState *sp = ZIPDecoderState(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 = TIFF_CLAMP_UINT64_TO_INT32_MAX(tif->tif_rawcc);
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if (inflateReset(&sp->stream) == Z_OK)
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{
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sp->read_error = 0;
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return 1;
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}
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return 0;
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}
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static int ZIPDecode(TIFF *tif, uint8_t *op, tmsize_t occ, uint16_t s)
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{
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static const char module[] = "ZIPDecode";
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ZIPState *sp = ZIPDecoderState(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 (sp->read_error)
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{
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memset(op, 0, (size_t)occ);
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TIFFErrorExtR(tif, module,
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"ZIPDecode: Scanline %" PRIu32 " cannot be read due to "
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"previous error",
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tif->tif_row);
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return 0;
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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 0;
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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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{
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TIFFDirectory *td = &tif->tif_dir;
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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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/* Check if we are in the situation where we can use libdeflate */
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if (isTiled(tif))
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{
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if (TIFFTileSize64(tif) != (uint64_t)occ)
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break;
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}
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else
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{
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uint32_t 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_t)occ)
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break;
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}
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/* Check for overflow */
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if ((size_t)tif->tif_rawcc != (uint64_t)tif->tif_rawcc)
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break;
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if ((size_t)occ != (uint64_t)occ)
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break;
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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(sp->libdeflate_dec, tif->tif_rawcp,
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(size_t)tif->tif_rawcc, op,
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(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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*/
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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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memset(op, 0, (size_t)occ);
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TIFFErrorExtR(tif, module, "Decoding error at scanline %lu",
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(unsigned long)tif->tif_row);
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sp->read_error = 1;
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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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{
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int state;
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uInt avail_in_before = TIFF_CLAMP_UINT64_TO_INT32_MAX(tif->tif_rawcc);
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uInt avail_out_before = TIFF_CLAMP_UINT64_TO_INT32_MAX(occ);
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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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{
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memset(sp->stream.next_out, 0, (size_t)occ);
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TIFFErrorExtR(tif, module, "Decoding error at scanline %lu, %s",
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(unsigned long)tif->tif_row, SAFE_MSG(sp));
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sp->read_error = 1;
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return (0);
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}
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if (state != Z_OK)
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{
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memset(sp->stream.next_out, 0, (size_t)occ);
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TIFFErrorExtR(tif, module, "ZLib error: %s", SAFE_MSG(sp));
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sp->read_error = 1;
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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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{
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TIFFErrorExtR(tif, module,
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"Not enough data at scanline %lu (short %" PRIu64
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" bytes)",
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(unsigned long)tif->tif_row, (uint64_t)occ);
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memset(sp->stream.next_out, 0, (size_t)occ);
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sp->read_error = 1;
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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 ZIPSetupEncode(TIFF *tif)
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{
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static const char module[] = "ZIPSetupEncode";
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ZIPState *sp = ZIPEncoderState(tif);
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int cappedQuality;
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assert(sp != NULL);
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if (sp->state & ZSTATE_INIT_DECODE)
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{
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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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{
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TIFFErrorExtR(tif, module, "%s", SAFE_MSG(sp));
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return (0);
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}
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else
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{
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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 ZIPPreEncode(TIFF *tif, uint16_t s)
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{
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ZIPState *sp = ZIPEncoderState(tif);
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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,
|
||||
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 */
|
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sp->stream.avail_out = (uint64_t)tif->tif_rawdatasize <= 0xFFFFFFFFU
|
||||
? (uInt)tif->tif_rawdatasize
|
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: 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";
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||||
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 = TIFF_CLAMP_UINT64_TO_INT32_MAX(cc);
|
||||
sp->stream.avail_in = avail_in_before;
|
||||
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 =
|
||||
TIFF_CLAMP_UINT64_TO_INT32_MAX(tif->tif_rawdatasize);
|
||||
}
|
||||
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, FIELD_PSEUDO, TRUE,
|
||||
FALSE, "", NULL},
|
||||
{TIFFTAG_DEFLATE_SUBCODEC, 0, 0, TIFF_ANY, 0, TIFF_SETGET_INT, FIELD_PSEUDO,
|
||||
TRUE, FALSE, "", NULL},
|
||||
};
|
||||
|
||||
static void *TIFF_zalloc(void *opaque, unsigned int items, unsigned int size)
|
||||
{
|
||||
static const char module[] = "TIFF_zalloc";
|
||||
TIFF *tif = opaque;
|
||||
|
||||
if (items > ~(size_t)0 / size)
|
||||
{
|
||||
TIFFErrorExtR(tif, module, "Overflow");
|
||||
return NULL;
|
||||
}
|
||||
|
||||
return _TIFFmallocExt(tif, items * size);
|
||||
}
|
||||
|
||||
static void TIFF_zfree(void *opaque, void *ptr)
|
||||
{
|
||||
_TIFFfreeExt((TIFF *)opaque, ptr);
|
||||
}
|
||||
|
||||
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 = TIFF_zalloc;
|
||||
sp->stream.zfree = TIFF_zfree;
|
||||
sp->stream.opaque = tif;
|
||||
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 */
|
||||
Reference in New Issue
Block a user