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1624 lines
53 KiB
1624 lines
53 KiB
/* |
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* Copyright (c) 1988-1997 Sam Leffler |
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* Copyright (c) 1991-1997 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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/* |
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* TIFF Library. |
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* Scanline-oriented Read Support |
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*/ |
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#include "tiffiop.h" |
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#include <stdio.h> |
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|
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int TIFFFillStrip(TIFF *tif, uint32_t strip); |
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int TIFFFillTile(TIFF *tif, uint32_t tile); |
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static int TIFFStartStrip(TIFF *tif, uint32_t strip); |
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static int TIFFStartTile(TIFF *tif, uint32_t tile); |
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static int TIFFCheckRead(TIFF *, int); |
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static tmsize_t TIFFReadRawStrip1(TIFF *tif, uint32_t strip, void *buf, |
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tmsize_t size, const char *module); |
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static tmsize_t TIFFReadRawTile1(TIFF *tif, uint32_t tile, void *buf, |
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tmsize_t size, const char *module); |
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|
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#define NOSTRIP ((uint32_t)(-1)) /* undefined state */ |
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#define NOTILE ((uint32_t)(-1)) /* undefined state */ |
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|
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#define INITIAL_THRESHOLD (1024 * 1024) |
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#define THRESHOLD_MULTIPLIER 10 |
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#define MAX_THRESHOLD \ |
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(THRESHOLD_MULTIPLIER * THRESHOLD_MULTIPLIER * THRESHOLD_MULTIPLIER * \ |
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INITIAL_THRESHOLD) |
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|
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#define TIFF_INT64_MAX ((((int64_t)0x7FFFFFFF) << 32) | 0xFFFFFFFF) |
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|
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/* Read 'size' bytes in tif_rawdata buffer starting at offset 'rawdata_offset' |
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* Returns 1 in case of success, 0 otherwise. */ |
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static int TIFFReadAndRealloc(TIFF *tif, tmsize_t size, tmsize_t rawdata_offset, |
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int is_strip, uint32_t strip_or_tile, |
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const char *module) |
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{ |
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#if SIZEOF_SIZE_T == 8 |
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tmsize_t threshold = INITIAL_THRESHOLD; |
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#endif |
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tmsize_t already_read = 0; |
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|
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#if SIZEOF_SIZE_T != 8 |
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/* On 32 bit processes, if the request is large enough, check against */ |
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/* file size */ |
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if (size > 1000 * 1000 * 1000) |
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{ |
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uint64_t filesize = TIFFGetFileSize(tif); |
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if ((uint64_t)size >= filesize) |
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{ |
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TIFFErrorExtR(tif, module, |
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"Chunk size requested is larger than file size."); |
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return 0; |
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} |
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} |
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#endif |
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|
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/* On 64 bit processes, read first a maximum of 1 MB, then 10 MB, etc */ |
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/* so as to avoid allocating too much memory in case the file is too */ |
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/* short. We could ask for the file size, but this might be */ |
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/* expensive with some I/O layers (think of reading a gzipped file) */ |
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/* Restrict to 64 bit processes, so as to avoid reallocs() */ |
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/* on 32 bit processes where virtual memory is scarce. */ |
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while (already_read < size) |
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{ |
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tmsize_t bytes_read; |
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tmsize_t to_read = size - already_read; |
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#if SIZEOF_SIZE_T == 8 |
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if (to_read >= threshold && threshold < MAX_THRESHOLD && |
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already_read + to_read + rawdata_offset > tif->tif_rawdatasize) |
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{ |
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to_read = threshold; |
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threshold *= THRESHOLD_MULTIPLIER; |
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} |
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#endif |
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if (already_read + to_read + rawdata_offset > tif->tif_rawdatasize) |
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{ |
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uint8_t *new_rawdata; |
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assert((tif->tif_flags & TIFF_MYBUFFER) != 0); |
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tif->tif_rawdatasize = (tmsize_t)TIFFroundup_64( |
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(uint64_t)already_read + to_read + rawdata_offset, 1024); |
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if (tif->tif_rawdatasize == 0) |
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{ |
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TIFFErrorExtR(tif, module, "Invalid buffer size"); |
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return 0; |
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} |
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new_rawdata = |
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(uint8_t *)_TIFFrealloc(tif->tif_rawdata, tif->tif_rawdatasize); |
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if (new_rawdata == 0) |
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{ |
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TIFFErrorExtR(tif, module, |
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"No space for data buffer at scanline %" PRIu32, |
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tif->tif_row); |
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_TIFFfreeExt(tif, tif->tif_rawdata); |
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tif->tif_rawdata = 0; |
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tif->tif_rawdatasize = 0; |
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return 0; |
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} |
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tif->tif_rawdata = new_rawdata; |
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} |
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if (tif->tif_rawdata == NULL) |
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{ |
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/* should not happen in practice but helps CoverityScan */ |
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return 0; |
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} |
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bytes_read = TIFFReadFile( |
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tif, tif->tif_rawdata + rawdata_offset + already_read, to_read); |
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already_read += bytes_read; |
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if (bytes_read != to_read) |
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{ |
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memset(tif->tif_rawdata + rawdata_offset + already_read, 0, |
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tif->tif_rawdatasize - rawdata_offset - already_read); |
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if (is_strip) |
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{ |
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TIFFErrorExtR(tif, module, |
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"Read error at scanline %" PRIu32 |
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"; got %" TIFF_SSIZE_FORMAT " bytes, " |
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"expected %" TIFF_SSIZE_FORMAT, |
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tif->tif_row, already_read, size); |
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} |
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else |
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{ |
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TIFFErrorExtR(tif, module, |
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"Read error at row %" PRIu32 ", col %" PRIu32 |
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", tile %" PRIu32 "; " |
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"got %" TIFF_SSIZE_FORMAT |
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" bytes, expected %" TIFF_SSIZE_FORMAT "", |
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tif->tif_row, tif->tif_col, strip_or_tile, |
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already_read, size); |
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} |
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return 0; |
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} |
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} |
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return 1; |
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} |
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|
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static int TIFFFillStripPartial(TIFF *tif, int strip, tmsize_t read_ahead, |
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int restart) |
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{ |
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static const char module[] = "TIFFFillStripPartial"; |
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register TIFFDirectory *td = &tif->tif_dir; |
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tmsize_t unused_data; |
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uint64_t read_offset; |
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tmsize_t to_read; |
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tmsize_t read_ahead_mod; |
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/* tmsize_t bytecountm; */ |
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|
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/* |
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* Expand raw data buffer, if needed, to hold data |
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* strip coming from file (perhaps should set upper |
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* bound on the size of a buffer we'll use?). |
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*/ |
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|
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/* bytecountm=(tmsize_t) TIFFGetStrileByteCount(tif, strip); */ |
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|
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/* Not completely sure where the * 2 comes from, but probably for */ |
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/* an exponentional growth strategy of tif_rawdatasize */ |
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if (read_ahead < TIFF_TMSIZE_T_MAX / 2) |
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read_ahead_mod = read_ahead * 2; |
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else |
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read_ahead_mod = read_ahead; |
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if (read_ahead_mod > tif->tif_rawdatasize) |
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{ |
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assert(restart); |
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tif->tif_curstrip = NOSTRIP; |
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if ((tif->tif_flags & TIFF_MYBUFFER) == 0) |
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{ |
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TIFFErrorExtR(tif, module, |
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"Data buffer too small to hold part of strip %d", |
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strip); |
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return (0); |
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} |
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} |
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if (restart) |
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{ |
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tif->tif_rawdataloaded = 0; |
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tif->tif_rawdataoff = 0; |
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} |
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/* |
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** If we are reading more data, move any unused data to the |
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** start of the buffer. |
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*/ |
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if (tif->tif_rawdataloaded > 0) |
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unused_data = |
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tif->tif_rawdataloaded - (tif->tif_rawcp - tif->tif_rawdata); |
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else |
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unused_data = 0; |
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|
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if (unused_data > 0) |
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{ |
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assert((tif->tif_flags & TIFF_BUFFERMMAP) == 0); |
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memmove(tif->tif_rawdata, tif->tif_rawcp, unused_data); |
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} |
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/* |
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** Seek to the point in the file where more data should be read. |
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*/ |
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read_offset = TIFFGetStrileOffset(tif, strip) + tif->tif_rawdataoff + |
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tif->tif_rawdataloaded; |
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|
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if (!SeekOK(tif, read_offset)) |
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{ |
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TIFFErrorExtR(tif, module, |
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"Seek error at scanline %" PRIu32 ", strip %d", |
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tif->tif_row, strip); |
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return 0; |
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} |
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|
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/* |
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** How much do we want to read? |
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*/ |
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if (read_ahead_mod > tif->tif_rawdatasize) |
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to_read = read_ahead_mod - unused_data; |
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else |
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to_read = tif->tif_rawdatasize - unused_data; |
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if ((uint64_t)to_read > TIFFGetStrileByteCount(tif, strip) - |
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tif->tif_rawdataoff - tif->tif_rawdataloaded) |
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{ |
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to_read = (tmsize_t)TIFFGetStrileByteCount(tif, strip) - |
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tif->tif_rawdataoff - tif->tif_rawdataloaded; |
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} |
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assert((tif->tif_flags & TIFF_BUFFERMMAP) == 0); |
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if (!TIFFReadAndRealloc(tif, to_read, unused_data, 1, /* is_strip */ |
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0, /* strip_or_tile */ |
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module)) |
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{ |
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return 0; |
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} |
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tif->tif_rawdataoff = |
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tif->tif_rawdataoff + tif->tif_rawdataloaded - unused_data; |
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tif->tif_rawdataloaded = unused_data + to_read; |
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|
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tif->tif_rawcc = tif->tif_rawdataloaded; |
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tif->tif_rawcp = tif->tif_rawdata; |
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|
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if (!isFillOrder(tif, td->td_fillorder) && |
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(tif->tif_flags & TIFF_NOBITREV) == 0) |
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{ |
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assert((tif->tif_flags & TIFF_BUFFERMMAP) == 0); |
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TIFFReverseBits(tif->tif_rawdata + unused_data, to_read); |
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} |
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|
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/* |
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** When starting a strip from the beginning we need to |
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** restart the decoder. |
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*/ |
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if (restart) |
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{ |
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|
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#ifdef JPEG_SUPPORT |
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/* A bit messy since breaks the codec abstraction. Ultimately */ |
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/* there should be a function pointer for that, but it seems */ |
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/* only JPEG is affected. */ |
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/* For JPEG, if there are multiple scans (can generally be known */ |
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/* with the read_ahead used), we need to read the whole strip */ |
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if (tif->tif_dir.td_compression == COMPRESSION_JPEG && |
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(uint64_t)tif->tif_rawcc < TIFFGetStrileByteCount(tif, strip)) |
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{ |
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if (TIFFJPEGIsFullStripRequired(tif)) |
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{ |
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return TIFFFillStrip(tif, strip); |
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} |
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} |
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#endif |
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return TIFFStartStrip(tif, strip); |
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} |
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else |
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{ |
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return 1; |
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} |
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} |
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/* |
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* Seek to a random row+sample in a file. |
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* |
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* Only used by TIFFReadScanline, and is only used on |
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* strip organized files. We do some tricky stuff to try |
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* and avoid reading the whole compressed raw data for big |
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* strips. |
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*/ |
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static int TIFFSeek(TIFF *tif, uint32_t row, uint16_t sample) |
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{ |
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register TIFFDirectory *td = &tif->tif_dir; |
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uint32_t strip; |
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int whole_strip; |
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tmsize_t read_ahead = 0; |
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|
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/* |
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** Establish what strip we are working from. |
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*/ |
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if (row >= td->td_imagelength) |
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{ /* out of range */ |
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TIFFErrorExtR(tif, tif->tif_name, |
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"%" PRIu32 ": Row out of range, max %" PRIu32 "", row, |
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td->td_imagelength); |
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return (0); |
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} |
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if (td->td_planarconfig == PLANARCONFIG_SEPARATE) |
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{ |
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if (sample >= td->td_samplesperpixel) |
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{ |
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TIFFErrorExtR(tif, tif->tif_name, |
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"%" PRIu16 ": Sample out of range, max %" PRIu16 "", |
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sample, td->td_samplesperpixel); |
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return (0); |
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} |
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strip = (uint32_t)sample * td->td_stripsperimage + |
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row / td->td_rowsperstrip; |
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} |
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else |
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strip = row / td->td_rowsperstrip; |
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|
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/* |
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* Do we want to treat this strip as one whole chunk or |
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* read it a few lines at a time? |
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*/ |
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#if defined(CHUNKY_STRIP_READ_SUPPORT) |
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whole_strip = TIFFGetStrileByteCount(tif, strip) < 10 || isMapped(tif); |
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if (td->td_compression == COMPRESSION_LERC || |
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td->td_compression == COMPRESSION_JBIG) |
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{ |
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/* Ideally plugins should have a way to declare they don't support |
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* chunk strip */ |
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whole_strip = 1; |
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} |
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#else |
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whole_strip = 1; |
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#endif |
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|
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if (!whole_strip) |
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{ |
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/* 16 is for YCbCr mode where we may need to read 16 */ |
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/* lines at a time to get a decompressed line, and 5000 */ |
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/* is some constant value, for example for JPEG tables */ |
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if (tif->tif_scanlinesize < TIFF_TMSIZE_T_MAX / 16 && |
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tif->tif_scanlinesize * 16 < TIFF_TMSIZE_T_MAX - 5000) |
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{ |
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read_ahead = tif->tif_scanlinesize * 16 + 5000; |
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} |
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else |
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{ |
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read_ahead = tif->tif_scanlinesize; |
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} |
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} |
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|
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/* |
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* If we haven't loaded this strip, do so now, possibly |
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* only reading the first part. |
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*/ |
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if (strip != tif->tif_curstrip) |
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{ /* different strip, refill */ |
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|
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if (whole_strip) |
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{ |
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if (!TIFFFillStrip(tif, strip)) |
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return (0); |
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} |
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else |
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{ |
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if (!TIFFFillStripPartial(tif, strip, read_ahead, 1)) |
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return 0; |
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} |
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} |
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|
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/* |
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** If we already have some data loaded, do we need to read some more? |
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*/ |
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else if (!whole_strip) |
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{ |
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if (((tif->tif_rawdata + tif->tif_rawdataloaded) - tif->tif_rawcp) < |
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read_ahead && |
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(uint64_t)tif->tif_rawdataoff + tif->tif_rawdataloaded < |
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TIFFGetStrileByteCount(tif, strip)) |
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{ |
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if (!TIFFFillStripPartial(tif, strip, read_ahead, 0)) |
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return 0; |
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} |
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} |
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|
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if (row < tif->tif_row) |
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{ |
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/* |
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* Moving backwards within the same strip: backup |
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* to the start and then decode forward (below). |
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* |
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* NB: If you're planning on lots of random access within a |
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* strip, it's better to just read and decode the entire |
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* strip, and then access the decoded data in a random fashion. |
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*/ |
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|
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if (tif->tif_rawdataoff != 0) |
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{ |
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if (!TIFFFillStripPartial(tif, strip, read_ahead, 1)) |
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return 0; |
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} |
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else |
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{ |
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if (!TIFFStartStrip(tif, strip)) |
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return (0); |
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} |
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} |
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|
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if (row != tif->tif_row) |
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{ |
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/* |
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* Seek forward to the desired row. |
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*/ |
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|
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/* TODO: Will this really work with partial buffers? */ |
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|
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if (!(*tif->tif_seek)(tif, row - tif->tif_row)) |
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return (0); |
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tif->tif_row = row; |
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} |
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|
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return (1); |
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} |
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|
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int TIFFReadScanline(TIFF *tif, void *buf, uint32_t row, uint16_t sample) |
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{ |
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int e; |
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|
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if (!TIFFCheckRead(tif, 0)) |
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return (-1); |
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if ((e = TIFFSeek(tif, row, sample)) != 0) |
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{ |
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/* |
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* Decompress desired row into user buffer. |
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*/ |
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e = (*tif->tif_decoderow)(tif, (uint8_t *)buf, tif->tif_scanlinesize, |
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sample); |
|
|
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/* we are now poised at the beginning of the next row */ |
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tif->tif_row = row + 1; |
|
|
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if (e) |
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(*tif->tif_postdecode)(tif, (uint8_t *)buf, tif->tif_scanlinesize); |
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} |
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return (e > 0 ? 1 : -1); |
|
} |
|
|
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/* |
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* Calculate the strip size according to the number of |
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* rows in the strip (check for truncated last strip on any |
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* of the separations). |
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*/ |
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static tmsize_t TIFFReadEncodedStripGetStripSize(TIFF *tif, uint32_t strip, |
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uint16_t *pplane) |
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{ |
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static const char module[] = "TIFFReadEncodedStrip"; |
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TIFFDirectory *td = &tif->tif_dir; |
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uint32_t rowsperstrip; |
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uint32_t stripsperplane; |
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uint32_t stripinplane; |
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uint32_t rows; |
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tmsize_t stripsize; |
|
if (!TIFFCheckRead(tif, 0)) |
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return ((tmsize_t)(-1)); |
|
if (strip >= td->td_nstrips) |
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{ |
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TIFFErrorExtR(tif, module, |
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"%" PRIu32 ": Strip out of range, max %" PRIu32, strip, |
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td->td_nstrips); |
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return ((tmsize_t)(-1)); |
|
} |
|
|
|
rowsperstrip = td->td_rowsperstrip; |
|
if (rowsperstrip > td->td_imagelength) |
|
rowsperstrip = td->td_imagelength; |
|
stripsperplane = |
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TIFFhowmany_32_maxuint_compat(td->td_imagelength, rowsperstrip); |
|
stripinplane = (strip % stripsperplane); |
|
if (pplane) |
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*pplane = (uint16_t)(strip / stripsperplane); |
|
rows = td->td_imagelength - stripinplane * rowsperstrip; |
|
if (rows > rowsperstrip) |
|
rows = rowsperstrip; |
|
stripsize = TIFFVStripSize(tif, rows); |
|
if (stripsize == 0) |
|
return ((tmsize_t)(-1)); |
|
return stripsize; |
|
} |
|
|
|
/* |
|
* Read a strip of data and decompress the specified |
|
* amount into the user-supplied buffer. |
|
*/ |
|
tmsize_t TIFFReadEncodedStrip(TIFF *tif, uint32_t strip, void *buf, |
|
tmsize_t size) |
|
{ |
|
static const char module[] = "TIFFReadEncodedStrip"; |
|
TIFFDirectory *td = &tif->tif_dir; |
|
tmsize_t stripsize; |
|
uint16_t plane; |
|
|
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stripsize = TIFFReadEncodedStripGetStripSize(tif, strip, &plane); |
|
if (stripsize == ((tmsize_t)(-1))) |
|
return ((tmsize_t)(-1)); |
|
|
|
/* shortcut to avoid an extra memcpy() */ |
|
if (td->td_compression == COMPRESSION_NONE && size != (tmsize_t)(-1) && |
|
size >= stripsize && !isMapped(tif) && |
|
((tif->tif_flags & TIFF_NOREADRAW) == 0)) |
|
{ |
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if (TIFFReadRawStrip1(tif, strip, buf, stripsize, module) != stripsize) |
|
return ((tmsize_t)(-1)); |
|
|
|
if (!isFillOrder(tif, td->td_fillorder) && |
|
(tif->tif_flags & TIFF_NOBITREV) == 0) |
|
TIFFReverseBits(buf, stripsize); |
|
|
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(*tif->tif_postdecode)(tif, buf, stripsize); |
|
return (stripsize); |
|
} |
|
|
|
if ((size != (tmsize_t)(-1)) && (size < stripsize)) |
|
stripsize = size; |
|
if (!TIFFFillStrip(tif, strip)) |
|
return ((tmsize_t)(-1)); |
|
if ((*tif->tif_decodestrip)(tif, buf, stripsize, plane) <= 0) |
|
return ((tmsize_t)(-1)); |
|
(*tif->tif_postdecode)(tif, buf, stripsize); |
|
return (stripsize); |
|
} |
|
|
|
/* Variant of TIFFReadEncodedStrip() that does |
|
* * if *buf == NULL, *buf = _TIFFmallocExt(tif, bufsizetoalloc) only after |
|
* TIFFFillStrip() has succeeded. This avoid excessive memory allocation in case |
|
* of truncated file. |
|
* * calls regular TIFFReadEncodedStrip() if *buf != NULL |
|
*/ |
|
tmsize_t _TIFFReadEncodedStripAndAllocBuffer(TIFF *tif, uint32_t strip, |
|
void **buf, |
|
tmsize_t bufsizetoalloc, |
|
tmsize_t size_to_read) |
|
{ |
|
tmsize_t this_stripsize; |
|
uint16_t plane; |
|
|
|
if (*buf != NULL) |
|
{ |
|
return TIFFReadEncodedStrip(tif, strip, *buf, size_to_read); |
|
} |
|
|
|
this_stripsize = TIFFReadEncodedStripGetStripSize(tif, strip, &plane); |
|
if (this_stripsize == ((tmsize_t)(-1))) |
|
return ((tmsize_t)(-1)); |
|
|
|
if ((size_to_read != (tmsize_t)(-1)) && (size_to_read < this_stripsize)) |
|
this_stripsize = size_to_read; |
|
if (!TIFFFillStrip(tif, strip)) |
|
return ((tmsize_t)(-1)); |
|
|
|
*buf = _TIFFmallocExt(tif, bufsizetoalloc); |
|
if (*buf == NULL) |
|
{ |
|
TIFFErrorExtR(tif, TIFFFileName(tif), "No space for strip buffer"); |
|
return ((tmsize_t)(-1)); |
|
} |
|
_TIFFmemset(*buf, 0, bufsizetoalloc); |
|
|
|
if ((*tif->tif_decodestrip)(tif, *buf, this_stripsize, plane) <= 0) |
|
return ((tmsize_t)(-1)); |
|
(*tif->tif_postdecode)(tif, *buf, this_stripsize); |
|
return (this_stripsize); |
|
} |
|
|
|
static tmsize_t TIFFReadRawStrip1(TIFF *tif, uint32_t strip, void *buf, |
|
tmsize_t size, const char *module) |
|
{ |
|
assert((tif->tif_flags & TIFF_NOREADRAW) == 0); |
|
if (!isMapped(tif)) |
|
{ |
|
tmsize_t cc; |
|
|
|
if (!SeekOK(tif, TIFFGetStrileOffset(tif, strip))) |
|
{ |
|
TIFFErrorExtR(tif, module, |
|
"Seek error at scanline %" PRIu32 ", strip %" PRIu32, |
|
tif->tif_row, strip); |
|
return ((tmsize_t)(-1)); |
|
} |
|
cc = TIFFReadFile(tif, buf, size); |
|
if (cc != size) |
|
{ |
|
TIFFErrorExtR(tif, module, |
|
"Read error at scanline %" PRIu32 |
|
"; got %" TIFF_SSIZE_FORMAT |
|
" bytes, expected %" TIFF_SSIZE_FORMAT, |
|
tif->tif_row, cc, size); |
|
return ((tmsize_t)(-1)); |
|
} |
|
} |
|
else |
|
{ |
|
tmsize_t ma = 0; |
|
tmsize_t n; |
|
if ((TIFFGetStrileOffset(tif, strip) > (uint64_t)TIFF_TMSIZE_T_MAX) || |
|
((ma = (tmsize_t)TIFFGetStrileOffset(tif, strip)) > tif->tif_size)) |
|
{ |
|
n = 0; |
|
} |
|
else if (ma > TIFF_TMSIZE_T_MAX - size) |
|
{ |
|
n = 0; |
|
} |
|
else |
|
{ |
|
tmsize_t mb = ma + size; |
|
if (mb > tif->tif_size) |
|
n = tif->tif_size - ma; |
|
else |
|
n = size; |
|
} |
|
if (n != size) |
|
{ |
|
TIFFErrorExtR(tif, module, |
|
"Read error at scanline %" PRIu32 ", strip %" PRIu32 |
|
"; got %" TIFF_SSIZE_FORMAT |
|
" bytes, expected %" TIFF_SSIZE_FORMAT, |
|
tif->tif_row, strip, n, size); |
|
return ((tmsize_t)(-1)); |
|
} |
|
_TIFFmemcpy(buf, tif->tif_base + ma, size); |
|
} |
|
return (size); |
|
} |
|
|
|
static tmsize_t TIFFReadRawStripOrTile2(TIFF *tif, uint32_t strip_or_tile, |
|
int is_strip, tmsize_t size, |
|
const char *module) |
|
{ |
|
assert(!isMapped(tif)); |
|
assert((tif->tif_flags & TIFF_NOREADRAW) == 0); |
|
|
|
if (!SeekOK(tif, TIFFGetStrileOffset(tif, strip_or_tile))) |
|
{ |
|
if (is_strip) |
|
{ |
|
TIFFErrorExtR(tif, module, |
|
"Seek error at scanline %" PRIu32 ", strip %" PRIu32, |
|
tif->tif_row, strip_or_tile); |
|
} |
|
else |
|
{ |
|
TIFFErrorExtR(tif, module, |
|
"Seek error at row %" PRIu32 ", col %" PRIu32 |
|
", tile %" PRIu32, |
|
tif->tif_row, tif->tif_col, strip_or_tile); |
|
} |
|
return ((tmsize_t)(-1)); |
|
} |
|
|
|
if (!TIFFReadAndRealloc(tif, size, 0, is_strip, strip_or_tile, module)) |
|
{ |
|
return ((tmsize_t)(-1)); |
|
} |
|
|
|
return (size); |
|
} |
|
|
|
/* |
|
* Read a strip of data from the file. |
|
*/ |
|
tmsize_t TIFFReadRawStrip(TIFF *tif, uint32_t strip, void *buf, tmsize_t size) |
|
{ |
|
static const char module[] = "TIFFReadRawStrip"; |
|
TIFFDirectory *td = &tif->tif_dir; |
|
uint64_t bytecount64; |
|
tmsize_t bytecountm; |
|
|
|
if (!TIFFCheckRead(tif, 0)) |
|
return ((tmsize_t)(-1)); |
|
if (strip >= td->td_nstrips) |
|
{ |
|
TIFFErrorExtR(tif, module, |
|
"%" PRIu32 ": Strip out of range, max %" PRIu32, strip, |
|
td->td_nstrips); |
|
return ((tmsize_t)(-1)); |
|
} |
|
if (tif->tif_flags & TIFF_NOREADRAW) |
|
{ |
|
TIFFErrorExtR(tif, module, |
|
"Compression scheme does not support access to raw " |
|
"uncompressed data"); |
|
return ((tmsize_t)(-1)); |
|
} |
|
bytecount64 = TIFFGetStrileByteCount(tif, strip); |
|
if (size != (tmsize_t)(-1) && (uint64_t)size <= bytecount64) |
|
bytecountm = size; |
|
else |
|
bytecountm = _TIFFCastUInt64ToSSize(tif, bytecount64, module); |
|
if (bytecountm == 0) |
|
{ |
|
return ((tmsize_t)(-1)); |
|
} |
|
return (TIFFReadRawStrip1(tif, strip, buf, bytecountm, module)); |
|
} |
|
|
|
TIFF_NOSANITIZE_UNSIGNED_INT_OVERFLOW |
|
static uint64_t NoSanitizeSubUInt64(uint64_t a, uint64_t b) { return a - b; } |
|
|
|
/* |
|
* Read the specified strip and setup for decoding. The data buffer is |
|
* expanded, as necessary, to hold the strip's data. |
|
*/ |
|
int TIFFFillStrip(TIFF *tif, uint32_t strip) |
|
{ |
|
static const char module[] = "TIFFFillStrip"; |
|
TIFFDirectory *td = &tif->tif_dir; |
|
|
|
if ((tif->tif_flags & TIFF_NOREADRAW) == 0) |
|
{ |
|
uint64_t bytecount = TIFFGetStrileByteCount(tif, strip); |
|
if (bytecount == 0 || bytecount > (uint64_t)TIFF_INT64_MAX) |
|
{ |
|
TIFFErrorExtR(tif, module, |
|
"Invalid strip byte count %" PRIu64 |
|
", strip %" PRIu32, |
|
bytecount, strip); |
|
return (0); |
|
} |
|
|
|
/* To avoid excessive memory allocations: */ |
|
/* Byte count should normally not be larger than a number of */ |
|
/* times the uncompressed size plus some margin */ |
|
if (bytecount > 1024 * 1024) |
|
{ |
|
/* 10 and 4096 are just values that could be adjusted. */ |
|
/* Hopefully they are safe enough for all codecs */ |
|
tmsize_t stripsize = TIFFStripSize(tif); |
|
if (stripsize != 0 && (bytecount - 4096) / 10 > (uint64_t)stripsize) |
|
{ |
|
uint64_t newbytecount = (uint64_t)stripsize * 10 + 4096; |
|
TIFFErrorExtR(tif, module, |
|
"Too large strip byte count %" PRIu64 |
|
", strip %" PRIu32 ". Limiting to %" PRIu64, |
|
bytecount, strip, newbytecount); |
|
bytecount = newbytecount; |
|
} |
|
} |
|
|
|
if (isMapped(tif)) |
|
{ |
|
/* |
|
* We must check for overflow, potentially causing |
|
* an OOB read. Instead of simple |
|
* |
|
* TIFFGetStrileOffset(tif, strip)+bytecount > tif->tif_size |
|
* |
|
* comparison (which can overflow) we do the following |
|
* two comparisons: |
|
*/ |
|
if (bytecount > (uint64_t)tif->tif_size || |
|
TIFFGetStrileOffset(tif, strip) > |
|
(uint64_t)tif->tif_size - bytecount) |
|
{ |
|
/* |
|
* This error message might seem strange, but |
|
* it's what would happen if a read were done |
|
* instead. |
|
*/ |
|
TIFFErrorExtR( |
|
tif, module, |
|
|
|
"Read error on strip %" PRIu32 "; " |
|
"got %" PRIu64 " bytes, expected %" PRIu64, |
|
strip, |
|
NoSanitizeSubUInt64(tif->tif_size, |
|
TIFFGetStrileOffset(tif, strip)), |
|
bytecount); |
|
tif->tif_curstrip = NOSTRIP; |
|
return (0); |
|
} |
|
} |
|
|
|
if (isMapped(tif) && (isFillOrder(tif, td->td_fillorder) || |
|
(tif->tif_flags & TIFF_NOBITREV))) |
|
{ |
|
/* |
|
* The image is mapped into memory and we either don't |
|
* need to flip bits or the compression routine is |
|
* going to handle this operation itself. In this |
|
* case, avoid copying the raw data and instead just |
|
* reference the data from the memory mapped file |
|
* image. This assumes that the decompression |
|
* routines do not modify the contents of the raw data |
|
* buffer (if they try to, the application will get a |
|
* fault since the file is mapped read-only). |
|
*/ |
|
if ((tif->tif_flags & TIFF_MYBUFFER) && tif->tif_rawdata) |
|
{ |
|
_TIFFfreeExt(tif, tif->tif_rawdata); |
|
tif->tif_rawdata = NULL; |
|
tif->tif_rawdatasize = 0; |
|
} |
|
tif->tif_flags &= ~TIFF_MYBUFFER; |
|
tif->tif_rawdatasize = (tmsize_t)bytecount; |
|
tif->tif_rawdata = |
|
tif->tif_base + (tmsize_t)TIFFGetStrileOffset(tif, strip); |
|
tif->tif_rawdataoff = 0; |
|
tif->tif_rawdataloaded = (tmsize_t)bytecount; |
|
|
|
/* |
|
* When we have tif_rawdata reference directly into the memory |
|
* mapped file we need to be pretty careful about how we use the |
|
* rawdata. It is not a general purpose working buffer as it |
|
* normally otherwise is. So we keep track of this fact to avoid |
|
* using it improperly. |
|
*/ |
|
tif->tif_flags |= TIFF_BUFFERMMAP; |
|
} |
|
else |
|
{ |
|
/* |
|
* Expand raw data buffer, if needed, to hold data |
|
* strip coming from file (perhaps should set upper |
|
* bound on the size of a buffer we'll use?). |
|
*/ |
|
tmsize_t bytecountm; |
|
bytecountm = (tmsize_t)bytecount; |
|
if ((uint64_t)bytecountm != bytecount) |
|
{ |
|
TIFFErrorExtR(tif, module, "Integer overflow"); |
|
return (0); |
|
} |
|
if (bytecountm > tif->tif_rawdatasize) |
|
{ |
|
tif->tif_curstrip = NOSTRIP; |
|
if ((tif->tif_flags & TIFF_MYBUFFER) == 0) |
|
{ |
|
TIFFErrorExtR( |
|
tif, module, |
|
"Data buffer too small to hold strip %" PRIu32, strip); |
|
return (0); |
|
} |
|
} |
|
if (tif->tif_flags & TIFF_BUFFERMMAP) |
|
{ |
|
tif->tif_curstrip = NOSTRIP; |
|
tif->tif_rawdata = NULL; |
|
tif->tif_rawdatasize = 0; |
|
tif->tif_flags &= ~TIFF_BUFFERMMAP; |
|
} |
|
|
|
if (isMapped(tif)) |
|
{ |
|
if (bytecountm > tif->tif_rawdatasize && |
|
!TIFFReadBufferSetup(tif, 0, bytecountm)) |
|
{ |
|
return (0); |
|
} |
|
if (TIFFReadRawStrip1(tif, strip, tif->tif_rawdata, bytecountm, |
|
module) != bytecountm) |
|
{ |
|
return (0); |
|
} |
|
} |
|
else |
|
{ |
|
if (TIFFReadRawStripOrTile2(tif, strip, 1, bytecountm, |
|
module) != bytecountm) |
|
{ |
|
return (0); |
|
} |
|
} |
|
|
|
tif->tif_rawdataoff = 0; |
|
tif->tif_rawdataloaded = bytecountm; |
|
|
|
if (!isFillOrder(tif, td->td_fillorder) && |
|
(tif->tif_flags & TIFF_NOBITREV) == 0) |
|
TIFFReverseBits(tif->tif_rawdata, bytecountm); |
|
} |
|
} |
|
return (TIFFStartStrip(tif, strip)); |
|
} |
|
|
|
/* |
|
* Tile-oriented Read Support |
|
* Contributed by Nancy Cam (Silicon Graphics). |
|
*/ |
|
|
|
/* |
|
* Read and decompress a tile of data. The |
|
* tile is selected by the (x,y,z,s) coordinates. |
|
*/ |
|
tmsize_t TIFFReadTile(TIFF *tif, void *buf, uint32_t x, uint32_t y, uint32_t z, |
|
uint16_t s) |
|
{ |
|
if (!TIFFCheckRead(tif, 1) || !TIFFCheckTile(tif, x, y, z, s)) |
|
return ((tmsize_t)(-1)); |
|
return (TIFFReadEncodedTile(tif, TIFFComputeTile(tif, x, y, z, s), buf, |
|
(tmsize_t)(-1))); |
|
} |
|
|
|
/* |
|
* Read a tile of data and decompress the specified |
|
* amount into the user-supplied buffer. |
|
*/ |
|
tmsize_t TIFFReadEncodedTile(TIFF *tif, uint32_t tile, void *buf, tmsize_t size) |
|
{ |
|
static const char module[] = "TIFFReadEncodedTile"; |
|
TIFFDirectory *td = &tif->tif_dir; |
|
tmsize_t tilesize = tif->tif_tilesize; |
|
|
|
if (!TIFFCheckRead(tif, 1)) |
|
return ((tmsize_t)(-1)); |
|
if (tile >= td->td_nstrips) |
|
{ |
|
TIFFErrorExtR(tif, module, |
|
"%" PRIu32 ": Tile out of range, max %" PRIu32, tile, |
|
td->td_nstrips); |
|
return ((tmsize_t)(-1)); |
|
} |
|
|
|
/* shortcut to avoid an extra memcpy() */ |
|
if (td->td_compression == COMPRESSION_NONE && size != (tmsize_t)(-1) && |
|
size >= tilesize && !isMapped(tif) && |
|
((tif->tif_flags & TIFF_NOREADRAW) == 0)) |
|
{ |
|
if (TIFFReadRawTile1(tif, tile, buf, tilesize, module) != tilesize) |
|
return ((tmsize_t)(-1)); |
|
|
|
if (!isFillOrder(tif, td->td_fillorder) && |
|
(tif->tif_flags & TIFF_NOBITREV) == 0) |
|
TIFFReverseBits(buf, tilesize); |
|
|
|
(*tif->tif_postdecode)(tif, buf, tilesize); |
|
return (tilesize); |
|
} |
|
|
|
if (size == (tmsize_t)(-1)) |
|
size = tilesize; |
|
else if (size > tilesize) |
|
size = tilesize; |
|
if (TIFFFillTile(tif, tile) && |
|
(*tif->tif_decodetile)(tif, (uint8_t *)buf, size, |
|
(uint16_t)(tile / td->td_stripsperimage))) |
|
{ |
|
(*tif->tif_postdecode)(tif, (uint8_t *)buf, size); |
|
return (size); |
|
} |
|
else |
|
return ((tmsize_t)(-1)); |
|
} |
|
|
|
/* Variant of TIFFReadTile() that does |
|
* * if *buf == NULL, *buf = _TIFFmallocExt(tif, bufsizetoalloc) only after |
|
* TIFFFillTile() has succeeded. This avoid excessive memory allocation in case |
|
* of truncated file. |
|
* * calls regular TIFFReadEncodedTile() if *buf != NULL |
|
*/ |
|
tmsize_t _TIFFReadTileAndAllocBuffer(TIFF *tif, void **buf, |
|
tmsize_t bufsizetoalloc, uint32_t x, |
|
uint32_t y, uint32_t z, uint16_t s) |
|
{ |
|
if (!TIFFCheckRead(tif, 1) || !TIFFCheckTile(tif, x, y, z, s)) |
|
return ((tmsize_t)(-1)); |
|
return (_TIFFReadEncodedTileAndAllocBuffer( |
|
tif, TIFFComputeTile(tif, x, y, z, s), buf, bufsizetoalloc, |
|
(tmsize_t)(-1))); |
|
} |
|
|
|
/* Variant of TIFFReadEncodedTile() that does |
|
* * if *buf == NULL, *buf = _TIFFmallocExt(tif, bufsizetoalloc) only after |
|
* TIFFFillTile() has succeeded. This avoid excessive memory allocation in case |
|
* of truncated file. |
|
* * calls regular TIFFReadEncodedTile() if *buf != NULL |
|
*/ |
|
tmsize_t _TIFFReadEncodedTileAndAllocBuffer(TIFF *tif, uint32_t tile, |
|
void **buf, tmsize_t bufsizetoalloc, |
|
tmsize_t size_to_read) |
|
{ |
|
static const char module[] = "_TIFFReadEncodedTileAndAllocBuffer"; |
|
TIFFDirectory *td = &tif->tif_dir; |
|
tmsize_t tilesize = tif->tif_tilesize; |
|
|
|
if (*buf != NULL) |
|
{ |
|
return TIFFReadEncodedTile(tif, tile, *buf, size_to_read); |
|
} |
|
|
|
if (!TIFFCheckRead(tif, 1)) |
|
return ((tmsize_t)(-1)); |
|
if (tile >= td->td_nstrips) |
|
{ |
|
TIFFErrorExtR(tif, module, |
|
"%" PRIu32 ": Tile out of range, max %" PRIu32, tile, |
|
td->td_nstrips); |
|
return ((tmsize_t)(-1)); |
|
} |
|
|
|
if (!TIFFFillTile(tif, tile)) |
|
return ((tmsize_t)(-1)); |
|
|
|
/* Sanity checks to avoid excessive memory allocation */ |
|
/* Cf https://gitlab.com/libtiff/libtiff/-/issues/479 */ |
|
if (td->td_compression == COMPRESSION_NONE) |
|
{ |
|
if (tif->tif_rawdatasize != tilesize) |
|
{ |
|
TIFFErrorExtR(tif, TIFFFileName(tif), |
|
"Invalid tile byte count for tile %u. " |
|
"Expected %" PRIu64 ", got %" PRIu64, |
|
tile, (uint64_t)tilesize, |
|
(uint64_t)tif->tif_rawdatasize); |
|
return ((tmsize_t)(-1)); |
|
} |
|
} |
|
else |
|
{ |
|
/* Max compression ratio experimentally determined. Might be fragile... |
|
* Only apply this heuristics to situations where the memory allocation |
|
* would be big, to avoid breaking nominal use cases. |
|
*/ |
|
const int maxCompressionRatio = |
|
td->td_compression == COMPRESSION_ZSTD ? 33000 |
|
: td->td_compression == COMPRESSION_JXL |
|
? |
|
/* Evaluated on a 8000x8000 tile */ |
|
25000 * (td->td_planarconfig == PLANARCONFIG_CONTIG |
|
? td->td_samplesperpixel |
|
: 1) |
|
: td->td_compression == COMPRESSION_LZMA ? 7000 : 1000; |
|
if (bufsizetoalloc > 100 * 1000 * 1000 && |
|
tif->tif_rawdatasize < tilesize / maxCompressionRatio) |
|
{ |
|
TIFFErrorExtR(tif, TIFFFileName(tif), |
|
"Likely invalid tile byte count for tile %u. " |
|
"Uncompressed tile size is %" PRIu64 ", " |
|
"compressed one is %" PRIu64, |
|
tile, (uint64_t)tilesize, |
|
(uint64_t)tif->tif_rawdatasize); |
|
return ((tmsize_t)(-1)); |
|
} |
|
} |
|
|
|
*buf = _TIFFmallocExt(tif, bufsizetoalloc); |
|
if (*buf == NULL) |
|
{ |
|
TIFFErrorExtR(tif, TIFFFileName(tif), "No space for tile buffer"); |
|
return ((tmsize_t)(-1)); |
|
} |
|
_TIFFmemset(*buf, 0, bufsizetoalloc); |
|
|
|
if (size_to_read == (tmsize_t)(-1)) |
|
size_to_read = tilesize; |
|
else if (size_to_read > tilesize) |
|
size_to_read = tilesize; |
|
if ((*tif->tif_decodetile)(tif, (uint8_t *)*buf, size_to_read, |
|
(uint16_t)(tile / td->td_stripsperimage))) |
|
{ |
|
(*tif->tif_postdecode)(tif, (uint8_t *)*buf, size_to_read); |
|
return (size_to_read); |
|
} |
|
else |
|
return ((tmsize_t)(-1)); |
|
} |
|
|
|
static tmsize_t TIFFReadRawTile1(TIFF *tif, uint32_t tile, void *buf, |
|
tmsize_t size, const char *module) |
|
{ |
|
assert((tif->tif_flags & TIFF_NOREADRAW) == 0); |
|
if (!isMapped(tif)) |
|
{ |
|
tmsize_t cc; |
|
|
|
if (!SeekOK(tif, TIFFGetStrileOffset(tif, tile))) |
|
{ |
|
TIFFErrorExtR(tif, module, |
|
"Seek error at row %" PRIu32 ", col %" PRIu32 |
|
", tile %" PRIu32, |
|
tif->tif_row, tif->tif_col, tile); |
|
return ((tmsize_t)(-1)); |
|
} |
|
cc = TIFFReadFile(tif, buf, size); |
|
if (cc != size) |
|
{ |
|
TIFFErrorExtR(tif, module, |
|
"Read error at row %" PRIu32 ", col %" PRIu32 |
|
"; got %" TIFF_SSIZE_FORMAT |
|
" bytes, expected %" TIFF_SSIZE_FORMAT, |
|
tif->tif_row, tif->tif_col, cc, size); |
|
return ((tmsize_t)(-1)); |
|
} |
|
} |
|
else |
|
{ |
|
tmsize_t ma, mb; |
|
tmsize_t n; |
|
ma = (tmsize_t)TIFFGetStrileOffset(tif, tile); |
|
mb = ma + size; |
|
if ((TIFFGetStrileOffset(tif, tile) > (uint64_t)TIFF_TMSIZE_T_MAX) || |
|
(ma > tif->tif_size)) |
|
n = 0; |
|
else if ((mb < ma) || (mb < size) || (mb > tif->tif_size)) |
|
n = tif->tif_size - ma; |
|
else |
|
n = size; |
|
if (n != size) |
|
{ |
|
TIFFErrorExtR(tif, module, |
|
"Read error at row %" PRIu32 ", col %" PRIu32 |
|
", tile %" PRIu32 "; got %" TIFF_SSIZE_FORMAT |
|
" bytes, expected %" TIFF_SSIZE_FORMAT, |
|
tif->tif_row, tif->tif_col, tile, n, size); |
|
return ((tmsize_t)(-1)); |
|
} |
|
_TIFFmemcpy(buf, tif->tif_base + ma, size); |
|
} |
|
return (size); |
|
} |
|
|
|
/* |
|
* Read a tile of data from the file. |
|
*/ |
|
tmsize_t TIFFReadRawTile(TIFF *tif, uint32_t tile, void *buf, tmsize_t size) |
|
{ |
|
static const char module[] = "TIFFReadRawTile"; |
|
TIFFDirectory *td = &tif->tif_dir; |
|
uint64_t bytecount64; |
|
tmsize_t bytecountm; |
|
|
|
if (!TIFFCheckRead(tif, 1)) |
|
return ((tmsize_t)(-1)); |
|
if (tile >= td->td_nstrips) |
|
{ |
|
TIFFErrorExtR(tif, module, |
|
"%" PRIu32 ": Tile out of range, max %" PRIu32, tile, |
|
td->td_nstrips); |
|
return ((tmsize_t)(-1)); |
|
} |
|
if (tif->tif_flags & TIFF_NOREADRAW) |
|
{ |
|
TIFFErrorExtR(tif, module, |
|
"Compression scheme does not support access to raw " |
|
"uncompressed data"); |
|
return ((tmsize_t)(-1)); |
|
} |
|
bytecount64 = TIFFGetStrileByteCount(tif, tile); |
|
if (size != (tmsize_t)(-1) && (uint64_t)size <= bytecount64) |
|
bytecountm = size; |
|
else |
|
bytecountm = _TIFFCastUInt64ToSSize(tif, bytecount64, module); |
|
if (bytecountm == 0) |
|
{ |
|
return ((tmsize_t)(-1)); |
|
} |
|
return (TIFFReadRawTile1(tif, tile, buf, bytecountm, module)); |
|
} |
|
|
|
/* |
|
* Read the specified tile and setup for decoding. The data buffer is |
|
* expanded, as necessary, to hold the tile's data. |
|
*/ |
|
int TIFFFillTile(TIFF *tif, uint32_t tile) |
|
{ |
|
static const char module[] = "TIFFFillTile"; |
|
TIFFDirectory *td = &tif->tif_dir; |
|
|
|
if ((tif->tif_flags & TIFF_NOREADRAW) == 0) |
|
{ |
|
uint64_t bytecount = TIFFGetStrileByteCount(tif, tile); |
|
if (bytecount == 0 || bytecount > (uint64_t)TIFF_INT64_MAX) |
|
{ |
|
TIFFErrorExtR(tif, module, |
|
"%" PRIu64 ": Invalid tile byte count, tile %" PRIu32, |
|
bytecount, tile); |
|
return (0); |
|
} |
|
|
|
/* To avoid excessive memory allocations: */ |
|
/* Byte count should normally not be larger than a number of */ |
|
/* times the uncompressed size plus some margin */ |
|
if (bytecount > 1024 * 1024) |
|
{ |
|
/* 10 and 4096 are just values that could be adjusted. */ |
|
/* Hopefully they are safe enough for all codecs */ |
|
tmsize_t stripsize = TIFFTileSize(tif); |
|
if (stripsize != 0 && (bytecount - 4096) / 10 > (uint64_t)stripsize) |
|
{ |
|
uint64_t newbytecount = (uint64_t)stripsize * 10 + 4096; |
|
TIFFErrorExtR(tif, module, |
|
"Too large tile byte count %" PRIu64 |
|
", tile %" PRIu32 ". Limiting to %" PRIu64, |
|
bytecount, tile, newbytecount); |
|
bytecount = newbytecount; |
|
} |
|
} |
|
|
|
if (isMapped(tif)) |
|
{ |
|
/* |
|
* We must check for overflow, potentially causing |
|
* an OOB read. Instead of simple |
|
* |
|
* TIFFGetStrileOffset(tif, tile)+bytecount > tif->tif_size |
|
* |
|
* comparison (which can overflow) we do the following |
|
* two comparisons: |
|
*/ |
|
if (bytecount > (uint64_t)tif->tif_size || |
|
TIFFGetStrileOffset(tif, tile) > |
|
(uint64_t)tif->tif_size - bytecount) |
|
{ |
|
tif->tif_curtile = NOTILE; |
|
return (0); |
|
} |
|
} |
|
|
|
if (isMapped(tif) && (isFillOrder(tif, td->td_fillorder) || |
|
(tif->tif_flags & TIFF_NOBITREV))) |
|
{ |
|
/* |
|
* The image is mapped into memory and we either don't |
|
* need to flip bits or the compression routine is |
|
* going to handle this operation itself. In this |
|
* case, avoid copying the raw data and instead just |
|
* reference the data from the memory mapped file |
|
* image. This assumes that the decompression |
|
* routines do not modify the contents of the raw data |
|
* buffer (if they try to, the application will get a |
|
* fault since the file is mapped read-only). |
|
*/ |
|
if ((tif->tif_flags & TIFF_MYBUFFER) && tif->tif_rawdata) |
|
{ |
|
_TIFFfreeExt(tif, tif->tif_rawdata); |
|
tif->tif_rawdata = NULL; |
|
tif->tif_rawdatasize = 0; |
|
} |
|
tif->tif_flags &= ~TIFF_MYBUFFER; |
|
|
|
tif->tif_rawdatasize = (tmsize_t)bytecount; |
|
tif->tif_rawdata = |
|
tif->tif_base + (tmsize_t)TIFFGetStrileOffset(tif, tile); |
|
tif->tif_rawdataoff = 0; |
|
tif->tif_rawdataloaded = (tmsize_t)bytecount; |
|
tif->tif_flags |= TIFF_BUFFERMMAP; |
|
} |
|
else |
|
{ |
|
/* |
|
* Expand raw data buffer, if needed, to hold data |
|
* tile coming from file (perhaps should set upper |
|
* bound on the size of a buffer we'll use?). |
|
*/ |
|
tmsize_t bytecountm; |
|
bytecountm = (tmsize_t)bytecount; |
|
if ((uint64_t)bytecountm != bytecount) |
|
{ |
|
TIFFErrorExtR(tif, module, "Integer overflow"); |
|
return (0); |
|
} |
|
if (bytecountm > tif->tif_rawdatasize) |
|
{ |
|
tif->tif_curtile = NOTILE; |
|
if ((tif->tif_flags & TIFF_MYBUFFER) == 0) |
|
{ |
|
TIFFErrorExtR(tif, module, |
|
"Data buffer too small to hold tile %" PRIu32, |
|
tile); |
|
return (0); |
|
} |
|
} |
|
if (tif->tif_flags & TIFF_BUFFERMMAP) |
|
{ |
|
tif->tif_curtile = NOTILE; |
|
tif->tif_rawdata = NULL; |
|
tif->tif_rawdatasize = 0; |
|
tif->tif_flags &= ~TIFF_BUFFERMMAP; |
|
} |
|
|
|
if (isMapped(tif)) |
|
{ |
|
if (bytecountm > tif->tif_rawdatasize && |
|
!TIFFReadBufferSetup(tif, 0, bytecountm)) |
|
{ |
|
return (0); |
|
} |
|
if (TIFFReadRawTile1(tif, tile, tif->tif_rawdata, bytecountm, |
|
module) != bytecountm) |
|
{ |
|
return (0); |
|
} |
|
} |
|
else |
|
{ |
|
if (TIFFReadRawStripOrTile2(tif, tile, 0, bytecountm, module) != |
|
bytecountm) |
|
{ |
|
return (0); |
|
} |
|
} |
|
|
|
tif->tif_rawdataoff = 0; |
|
tif->tif_rawdataloaded = bytecountm; |
|
|
|
if (tif->tif_rawdata != NULL && |
|
!isFillOrder(tif, td->td_fillorder) && |
|
(tif->tif_flags & TIFF_NOBITREV) == 0) |
|
TIFFReverseBits(tif->tif_rawdata, tif->tif_rawdataloaded); |
|
} |
|
} |
|
return (TIFFStartTile(tif, tile)); |
|
} |
|
|
|
/* |
|
* Setup the raw data buffer in preparation for |
|
* reading a strip of raw data. If the buffer |
|
* is specified as zero, then a buffer of appropriate |
|
* size is allocated by the library. Otherwise, |
|
* the client must guarantee that the buffer is |
|
* large enough to hold any individual strip of |
|
* raw data. |
|
*/ |
|
int TIFFReadBufferSetup(TIFF *tif, void *bp, tmsize_t size) |
|
{ |
|
static const char module[] = "TIFFReadBufferSetup"; |
|
|
|
assert((tif->tif_flags & TIFF_NOREADRAW) == 0); |
|
tif->tif_flags &= ~TIFF_BUFFERMMAP; |
|
|
|
if (tif->tif_rawdata) |
|
{ |
|
if (tif->tif_flags & TIFF_MYBUFFER) |
|
_TIFFfreeExt(tif, tif->tif_rawdata); |
|
tif->tif_rawdata = NULL; |
|
tif->tif_rawdatasize = 0; |
|
} |
|
if (bp) |
|
{ |
|
tif->tif_rawdatasize = size; |
|
tif->tif_rawdata = (uint8_t *)bp; |
|
tif->tif_flags &= ~TIFF_MYBUFFER; |
|
} |
|
else |
|
{ |
|
tif->tif_rawdatasize = (tmsize_t)TIFFroundup_64((uint64_t)size, 1024); |
|
if (tif->tif_rawdatasize == 0) |
|
{ |
|
TIFFErrorExtR(tif, module, "Invalid buffer size"); |
|
return (0); |
|
} |
|
/* Initialize to zero to avoid uninitialized buffers in case of */ |
|
/* short reads (http://bugzilla.maptools.org/show_bug.cgi?id=2651) */ |
|
tif->tif_rawdata = |
|
(uint8_t *)_TIFFcallocExt(tif, 1, tif->tif_rawdatasize); |
|
tif->tif_flags |= TIFF_MYBUFFER; |
|
} |
|
if (tif->tif_rawdata == NULL) |
|
{ |
|
TIFFErrorExtR(tif, module, |
|
"No space for data buffer at scanline %" PRIu32, |
|
tif->tif_row); |
|
tif->tif_rawdatasize = 0; |
|
return (0); |
|
} |
|
return (1); |
|
} |
|
|
|
/* |
|
* Set state to appear as if a |
|
* strip has just been read in. |
|
*/ |
|
static int TIFFStartStrip(TIFF *tif, uint32_t strip) |
|
{ |
|
TIFFDirectory *td = &tif->tif_dir; |
|
|
|
if ((tif->tif_flags & TIFF_CODERSETUP) == 0) |
|
{ |
|
if (!(*tif->tif_setupdecode)(tif)) |
|
return (0); |
|
tif->tif_flags |= TIFF_CODERSETUP; |
|
} |
|
tif->tif_curstrip = strip; |
|
tif->tif_row = (strip % td->td_stripsperimage) * td->td_rowsperstrip; |
|
tif->tif_flags &= ~TIFF_BUF4WRITE; |
|
|
|
if (tif->tif_flags & TIFF_NOREADRAW) |
|
{ |
|
tif->tif_rawcp = NULL; |
|
tif->tif_rawcc = 0; |
|
} |
|
else |
|
{ |
|
tif->tif_rawcp = tif->tif_rawdata; |
|
if (tif->tif_rawdataloaded > 0) |
|
tif->tif_rawcc = tif->tif_rawdataloaded; |
|
else |
|
tif->tif_rawcc = (tmsize_t)TIFFGetStrileByteCount(tif, strip); |
|
} |
|
if ((*tif->tif_predecode)(tif, (uint16_t)(strip / td->td_stripsperimage)) == |
|
0) |
|
{ |
|
/* Needed for example for scanline access, if tif_predecode */ |
|
/* fails, and we try to read the same strip again. Without invalidating |
|
*/ |
|
/* tif_curstrip, we'd call tif_decoderow() on a possibly invalid */ |
|
/* codec state. */ |
|
tif->tif_curstrip = NOSTRIP; |
|
return 0; |
|
} |
|
return 1; |
|
} |
|
|
|
/* |
|
* Set state to appear as if a |
|
* tile has just been read in. |
|
*/ |
|
static int TIFFStartTile(TIFF *tif, uint32_t tile) |
|
{ |
|
static const char module[] = "TIFFStartTile"; |
|
TIFFDirectory *td = &tif->tif_dir; |
|
uint32_t howmany32; |
|
|
|
if ((tif->tif_flags & TIFF_CODERSETUP) == 0) |
|
{ |
|
if (!(*tif->tif_setupdecode)(tif)) |
|
return (0); |
|
tif->tif_flags |= TIFF_CODERSETUP; |
|
} |
|
tif->tif_curtile = tile; |
|
howmany32 = TIFFhowmany_32(td->td_imagewidth, td->td_tilewidth); |
|
if (howmany32 == 0) |
|
{ |
|
TIFFErrorExtR(tif, module, "Zero tiles"); |
|
return 0; |
|
} |
|
tif->tif_row = (tile % howmany32) * td->td_tilelength; |
|
howmany32 = TIFFhowmany_32(td->td_imagelength, td->td_tilelength); |
|
if (howmany32 == 0) |
|
{ |
|
TIFFErrorExtR(tif, module, "Zero tiles"); |
|
return 0; |
|
} |
|
tif->tif_col = (tile % howmany32) * td->td_tilewidth; |
|
tif->tif_flags &= ~TIFF_BUF4WRITE; |
|
if (tif->tif_flags & TIFF_NOREADRAW) |
|
{ |
|
tif->tif_rawcp = NULL; |
|
tif->tif_rawcc = 0; |
|
} |
|
else |
|
{ |
|
tif->tif_rawcp = tif->tif_rawdata; |
|
if (tif->tif_rawdataloaded > 0) |
|
tif->tif_rawcc = tif->tif_rawdataloaded; |
|
else |
|
tif->tif_rawcc = (tmsize_t)TIFFGetStrileByteCount(tif, tile); |
|
} |
|
return ( |
|
(*tif->tif_predecode)(tif, (uint16_t)(tile / td->td_stripsperimage))); |
|
} |
|
|
|
static int TIFFCheckRead(TIFF *tif, int tiles) |
|
{ |
|
if (tif->tif_mode == O_WRONLY) |
|
{ |
|
TIFFErrorExtR(tif, tif->tif_name, "File not open for reading"); |
|
return (0); |
|
} |
|
if (tiles ^ isTiled(tif)) |
|
{ |
|
TIFFErrorExtR(tif, tif->tif_name, |
|
tiles ? "Can not read tiles from a striped image" |
|
: "Can not read scanlines from a tiled image"); |
|
return (0); |
|
} |
|
return (1); |
|
} |
|
|
|
/* Use the provided input buffer (inbuf, insize) and decompress it into |
|
* (outbuf, outsize). |
|
* This function replaces the use of |
|
* TIFFReadEncodedStrip()/TIFFReadEncodedTile() when the user can provide the |
|
* buffer for the input data, for example when he wants to avoid libtiff to read |
|
* the strile offset/count values from the [Strip|Tile][Offsets/ByteCounts] |
|
* array. inbuf content must be writable (if bit reversal is needed) Returns 1 |
|
* in case of success, 0 otherwise. |
|
*/ |
|
int TIFFReadFromUserBuffer(TIFF *tif, uint32_t strile, void *inbuf, |
|
tmsize_t insize, void *outbuf, tmsize_t outsize) |
|
{ |
|
static const char module[] = "TIFFReadFromUserBuffer"; |
|
TIFFDirectory *td = &tif->tif_dir; |
|
int ret = 1; |
|
uint32_t old_tif_flags = tif->tif_flags; |
|
tmsize_t old_rawdatasize = tif->tif_rawdatasize; |
|
void *old_rawdata = tif->tif_rawdata; |
|
|
|
if (tif->tif_mode == O_WRONLY) |
|
{ |
|
TIFFErrorExtR(tif, tif->tif_name, "File not open for reading"); |
|
return 0; |
|
} |
|
if (tif->tif_flags & TIFF_NOREADRAW) |
|
{ |
|
TIFFErrorExtR(tif, module, |
|
"Compression scheme does not support access to raw " |
|
"uncompressed data"); |
|
return 0; |
|
} |
|
|
|
tif->tif_flags &= ~TIFF_MYBUFFER; |
|
tif->tif_flags |= TIFF_BUFFERMMAP; |
|
tif->tif_rawdatasize = insize; |
|
tif->tif_rawdata = inbuf; |
|
tif->tif_rawdataoff = 0; |
|
tif->tif_rawdataloaded = insize; |
|
|
|
if (!isFillOrder(tif, td->td_fillorder) && |
|
(tif->tif_flags & TIFF_NOBITREV) == 0) |
|
{ |
|
TIFFReverseBits(inbuf, insize); |
|
} |
|
|
|
if (TIFFIsTiled(tif)) |
|
{ |
|
if (!TIFFStartTile(tif, strile) || |
|
!(*tif->tif_decodetile)(tif, (uint8_t *)outbuf, outsize, |
|
(uint16_t)(strile / td->td_stripsperimage))) |
|
{ |
|
ret = 0; |
|
} |
|
} |
|
else |
|
{ |
|
uint32_t rowsperstrip = td->td_rowsperstrip; |
|
uint32_t stripsperplane; |
|
if (rowsperstrip > td->td_imagelength) |
|
rowsperstrip = td->td_imagelength; |
|
stripsperplane = |
|
TIFFhowmany_32_maxuint_compat(td->td_imagelength, rowsperstrip); |
|
if (!TIFFStartStrip(tif, strile) || |
|
!(*tif->tif_decodestrip)(tif, (uint8_t *)outbuf, outsize, |
|
(uint16_t)(strile / stripsperplane))) |
|
{ |
|
ret = 0; |
|
} |
|
} |
|
if (ret) |
|
{ |
|
(*tif->tif_postdecode)(tif, (uint8_t *)outbuf, outsize); |
|
} |
|
|
|
if (!isFillOrder(tif, td->td_fillorder) && |
|
(tif->tif_flags & TIFF_NOBITREV) == 0) |
|
{ |
|
TIFFReverseBits(inbuf, insize); |
|
} |
|
|
|
tif->tif_flags = (old_tif_flags & (TIFF_MYBUFFER | TIFF_BUFFERMMAP)) | |
|
(tif->tif_flags & ~(TIFF_MYBUFFER | TIFF_BUFFERMMAP)); |
|
tif->tif_rawdatasize = old_rawdatasize; |
|
tif->tif_rawdata = old_rawdata; |
|
tif->tif_rawdataoff = 0; |
|
tif->tif_rawdataloaded = 0; |
|
|
|
return ret; |
|
} |
|
|
|
void _TIFFNoPostDecode(TIFF *tif, uint8_t *buf, tmsize_t cc) |
|
{ |
|
(void)tif; |
|
(void)buf; |
|
(void)cc; |
|
} |
|
|
|
void _TIFFSwab16BitData(TIFF *tif, uint8_t *buf, tmsize_t cc) |
|
{ |
|
(void)tif; |
|
assert((cc & 1) == 0); |
|
TIFFSwabArrayOfShort((uint16_t *)buf, cc / 2); |
|
} |
|
|
|
void _TIFFSwab24BitData(TIFF *tif, uint8_t *buf, tmsize_t cc) |
|
{ |
|
(void)tif; |
|
assert((cc % 3) == 0); |
|
TIFFSwabArrayOfTriples((uint8_t *)buf, cc / 3); |
|
} |
|
|
|
void _TIFFSwab32BitData(TIFF *tif, uint8_t *buf, tmsize_t cc) |
|
{ |
|
(void)tif; |
|
assert((cc & 3) == 0); |
|
TIFFSwabArrayOfLong((uint32_t *)buf, cc / 4); |
|
} |
|
|
|
void _TIFFSwab64BitData(TIFF *tif, uint8_t *buf, tmsize_t cc) |
|
{ |
|
(void)tif; |
|
assert((cc & 7) == 0); |
|
TIFFSwabArrayOfDouble((double *)buf, cc / 8); |
|
}
|
|
|