/* * Copyright (c) 1988-1997 Sam Leffler * Copyright (c) 1991-1997 Silicon Graphics, Inc. * * Permission to use, copy, modify, distribute, and sell this software and * its documentation for any purpose is hereby granted without fee, provided * that (i) the above copyright notices and this permission notice appear in * all copies of the software and related documentation, and (ii) the names of * Sam Leffler and Silicon Graphics may not be used in any advertising or * publicity relating to the software without the specific, prior written * permission of Sam Leffler and Silicon Graphics. * * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. * * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE * OF THIS SOFTWARE. */ /* * TIFF Library. * Scanline-oriented Read Support */ #include "tiffiop.h" #include int TIFFFillStrip(TIFF* tif, uint32 strip); int TIFFFillTile(TIFF* tif, uint32 tile); static int TIFFStartStrip(TIFF* tif, uint32 strip); static int TIFFStartTile(TIFF* tif, uint32 tile); static int TIFFCheckRead(TIFF*, int); static tmsize_t TIFFReadRawStrip1(TIFF* tif, uint32 strip, void* buf, tmsize_t size,const char* module); static tmsize_t TIFFReadRawTile1(TIFF* tif, uint32 tile, void* buf, tmsize_t size, const char* module); #define NOSTRIP ((uint32)(-1)) /* undefined state */ #define NOTILE ((uint32)(-1)) /* undefined state */ #define INITIAL_THRESHOLD (1024 * 1024) #define THRESHOLD_MULTIPLIER 10 #define MAX_THRESHOLD (THRESHOLD_MULTIPLIER * THRESHOLD_MULTIPLIER * THRESHOLD_MULTIPLIER * INITIAL_THRESHOLD) #define TIFF_INT64_MAX ((((int64)0x7FFFFFFF) << 32) | 0xFFFFFFFF) /* Read 'size' bytes in tif_rawdata buffer starting at offset 'rawdata_offset' * Returns 1 in case of success, 0 otherwise. */ static int TIFFReadAndRealloc( TIFF* tif, tmsize_t size, tmsize_t rawdata_offset, int is_strip, uint32 strip_or_tile, const char* module ) { #if SIZEOF_SIZE_T == 8 tmsize_t threshold = INITIAL_THRESHOLD; #endif tmsize_t already_read = 0; #if SIZEOF_SIZE_T != 8 /* On 32 bit processes, if the request is large enough, check against */ /* file size */ if( size > 1000 * 1000 * 1000 ) { uint64 filesize = TIFFGetFileSize(tif); if( (uint64)size >= filesize ) { TIFFErrorExt(tif->tif_clientdata, module, "Chunk size requested is larger than file size."); return 0; } } #endif /* On 64 bit processes, read first a maximum of 1 MB, then 10 MB, etc */ /* so as to avoid allocating too much memory in case the file is too */ /* short. We could ask for the file size, but this might be */ /* expensive with some I/O layers (think of reading a gzipped file) */ /* Restrict to 64 bit processes, so as to avoid reallocs() */ /* on 32 bit processes where virtual memory is scarce. */ while( already_read < size ) { tmsize_t bytes_read; tmsize_t to_read = size - already_read; #if SIZEOF_SIZE_T == 8 if( to_read >= threshold && threshold < MAX_THRESHOLD && already_read + to_read + rawdata_offset > tif->tif_rawdatasize ) { to_read = threshold; threshold *= THRESHOLD_MULTIPLIER; } #endif if (already_read + to_read + rawdata_offset > tif->tif_rawdatasize) { uint8* new_rawdata; assert((tif->tif_flags & TIFF_MYBUFFER) != 0); tif->tif_rawdatasize = (tmsize_t)TIFFroundup_64( (uint64)already_read + to_read + rawdata_offset, 1024); if (tif->tif_rawdatasize==0) { TIFFErrorExt(tif->tif_clientdata, module, "Invalid buffer size"); return 0; } new_rawdata = (uint8*) _TIFFrealloc( tif->tif_rawdata, tif->tif_rawdatasize); if( new_rawdata == 0 ) { TIFFErrorExt(tif->tif_clientdata, module, "No space for data buffer at scanline %lu", (unsigned long) tif->tif_row); _TIFFfree(tif->tif_rawdata); tif->tif_rawdata = 0; tif->tif_rawdatasize = 0; return 0; } tif->tif_rawdata = new_rawdata; } if( tif->tif_rawdata == NULL ) { /* should not happen in practice but helps CoverityScan */ return 0; } bytes_read = TIFFReadFile(tif, tif->tif_rawdata + rawdata_offset + already_read, to_read); already_read += bytes_read; if (bytes_read != to_read) { memset( tif->tif_rawdata + rawdata_offset + already_read, 0, tif->tif_rawdatasize - rawdata_offset - already_read ); #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__)) if( is_strip ) { TIFFErrorExt(tif->tif_clientdata, module, "Read error at scanline %lu; got %I64u bytes, " "expected %I64u", (unsigned long) tif->tif_row, (unsigned __int64) already_read, (unsigned __int64) size); } else { TIFFErrorExt(tif->tif_clientdata, module, "Read error at row %lu, col %lu, tile %lu; " "got %I64u bytes, expected %I64u", (unsigned long) tif->tif_row, (unsigned long) tif->tif_col, (unsigned long) strip_or_tile, (unsigned __int64) already_read, (unsigned __int64) size); } #else if( is_strip ) { TIFFErrorExt(tif->tif_clientdata, module, "Read error at scanline %lu; got %llu bytes, " "expected %llu", (unsigned long) tif->tif_row, (unsigned long long) already_read, (unsigned long long) size); } else { TIFFErrorExt(tif->tif_clientdata, module, "Read error at row %lu, col %lu, tile %lu; " "got %llu bytes, expected %llu", (unsigned long) tif->tif_row, (unsigned long) tif->tif_col, (unsigned long) strip_or_tile, (unsigned long long) already_read, (unsigned long long) size); } #endif return 0; } } return 1; } static int TIFFFillStripPartial( TIFF *tif, int strip, tmsize_t read_ahead, int restart ) { static const char module[] = "TIFFFillStripPartial"; register TIFFDirectory *td = &tif->tif_dir; tmsize_t unused_data; uint64 read_offset; tmsize_t to_read; tmsize_t read_ahead_mod; /* tmsize_t bytecountm; */ /* * 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?). */ /* bytecountm=(tmsize_t) TIFFGetStrileByteCount(tif, strip); */ /* Not completely sure where the * 2 comes from, but probably for */ /* an exponentional growth strategy of tif_rawdatasize */ if( read_ahead < TIFF_TMSIZE_T_MAX / 2 ) read_ahead_mod = read_ahead * 2; else read_ahead_mod = read_ahead; if (read_ahead_mod > tif->tif_rawdatasize) { assert( restart ); tif->tif_curstrip = NOSTRIP; if ((tif->tif_flags & TIFF_MYBUFFER) == 0) { TIFFErrorExt(tif->tif_clientdata, module, "Data buffer too small to hold part of strip %lu", (unsigned long) strip); return (0); } } if( restart ) { tif->tif_rawdataloaded = 0; tif->tif_rawdataoff = 0; } /* ** If we are reading more data, move any unused data to the ** start of the buffer. */ if( tif->tif_rawdataloaded > 0 ) unused_data = tif->tif_rawdataloaded - (tif->tif_rawcp - tif->tif_rawdata); else unused_data = 0; if( unused_data > 0 ) { assert((tif->tif_flags&TIFF_BUFFERMMAP)==0); memmove( tif->tif_rawdata, tif->tif_rawcp, unused_data ); } /* ** Seek to the point in the file where more data should be read. */ read_offset = TIFFGetStrileOffset(tif, strip) + tif->tif_rawdataoff + tif->tif_rawdataloaded; if (!SeekOK(tif, read_offset)) { TIFFErrorExt(tif->tif_clientdata, module, "Seek error at scanline %lu, strip %lu", (unsigned long) tif->tif_row, (unsigned long) strip); return 0; } /* ** How much do we want to read? */ if( read_ahead_mod > tif->tif_rawdatasize ) to_read = read_ahead_mod - unused_data; else to_read = tif->tif_rawdatasize - unused_data; if( (uint64) to_read > TIFFGetStrileByteCount(tif, strip) - tif->tif_rawdataoff - tif->tif_rawdataloaded ) { to_read = (tmsize_t) TIFFGetStrileByteCount(tif, strip) - tif->tif_rawdataoff - tif->tif_rawdataloaded; } assert((tif->tif_flags&TIFF_BUFFERMMAP)==0); if( !TIFFReadAndRealloc( tif, to_read, unused_data, 1, /* is_strip */ 0, /* strip_or_tile */ module) ) { return 0; } tif->tif_rawdataoff = tif->tif_rawdataoff + tif->tif_rawdataloaded - unused_data ; tif->tif_rawdataloaded = unused_data + to_read; tif->tif_rawcc = tif->tif_rawdataloaded; tif->tif_rawcp = tif->tif_rawdata; if (!isFillOrder(tif, td->td_fillorder) && (tif->tif_flags & TIFF_NOBITREV) == 0) { assert((tif->tif_flags&TIFF_BUFFERMMAP)==0); TIFFReverseBits(tif->tif_rawdata + unused_data, to_read ); } /* ** When starting a strip from the beginning we need to ** restart the decoder. */ if( restart ) { #ifdef JPEG_SUPPORT /* A bit messy since breaks the codec abstraction. Ultimately */ /* there should be a function pointer for that, but it seems */ /* only JPEG is affected. */ /* For JPEG, if there are multiple scans (can generally be known */ /* with the read_ahead used), we need to read the whole strip */ if( tif->tif_dir.td_compression==COMPRESSION_JPEG && (uint64)tif->tif_rawcc < TIFFGetStrileByteCount(tif, strip) ) { if( TIFFJPEGIsFullStripRequired(tif) ) { return TIFFFillStrip(tif, strip); } } #endif return TIFFStartStrip(tif, strip); } else { return 1; } } /* * Seek to a random row+sample in a file. * * Only used by TIFFReadScanline, and is only used on * strip organized files. We do some tricky stuff to try * and avoid reading the whole compressed raw data for big * strips. */ static int TIFFSeek(TIFF* tif, uint32 row, uint16 sample ) { register TIFFDirectory *td = &tif->tif_dir; uint32 strip; int whole_strip; tmsize_t read_ahead = 0; /* ** Establish what strip we are working from. */ if (row >= td->td_imagelength) { /* out of range */ TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "%lu: Row out of range, max %lu", (unsigned long) row, (unsigned long) td->td_imagelength); return (0); } if (td->td_planarconfig == PLANARCONFIG_SEPARATE) { if (sample >= td->td_samplesperpixel) { TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "%lu: Sample out of range, max %lu", (unsigned long) sample, (unsigned long) td->td_samplesperpixel); return (0); } strip = (uint32)sample*td->td_stripsperimage + row/td->td_rowsperstrip; } else strip = row / td->td_rowsperstrip; /* * Do we want to treat this strip as one whole chunk or * read it a few lines at a time? */ #if defined(CHUNKY_STRIP_READ_SUPPORT) whole_strip = TIFFGetStrileByteCount(tif, strip) < 10 || isMapped(tif); if( td->td_compression == COMPRESSION_LERC || td->td_compression == COMPRESSION_JBIG ) { /* Ideally plugins should have a way to declare they don't support * chunk strip */ whole_strip = 1; } #else whole_strip = 1; #endif if( !whole_strip ) { /* 16 is for YCbCr mode where we may need to read 16 */ /* lines at a time to get a decompressed line, and 5000 */ /* is some constant value, for example for JPEG tables */ if( tif->tif_scanlinesize < TIFF_TMSIZE_T_MAX / 16 && tif->tif_scanlinesize * 16 < TIFF_TMSIZE_T_MAX - 5000 ) { read_ahead = tif->tif_scanlinesize * 16 + 5000; } else { read_ahead = tif->tif_scanlinesize; } } /* * If we haven't loaded this strip, do so now, possibly * only reading the first part. */ if (strip != tif->tif_curstrip) { /* different strip, refill */ if( whole_strip ) { if (!TIFFFillStrip(tif, strip)) return (0); } else { if( !TIFFFillStripPartial(tif,strip,read_ahead,1) ) return 0; } } /* ** If we already have some data loaded, do we need to read some more? */ else if( !whole_strip ) { if( ((tif->tif_rawdata + tif->tif_rawdataloaded) - tif->tif_rawcp) < read_ahead && (uint64) tif->tif_rawdataoff+tif->tif_rawdataloaded < TIFFGetStrileByteCount(tif, strip) ) { if( !TIFFFillStripPartial(tif,strip,read_ahead,0) ) return 0; } } if (row < tif->tif_row) { /* * Moving backwards within the same strip: backup * to the start and then decode forward (below). * * NB: If you're planning on lots of random access within a * strip, it's better to just read and decode the entire * strip, and then access the decoded data in a random fashion. */ if( tif->tif_rawdataoff != 0 ) { if( !TIFFFillStripPartial(tif,strip,read_ahead,1) ) return 0; } else { if (!TIFFStartStrip(tif, strip)) return (0); } } if (row != tif->tif_row) { /* * Seek forward to the desired row. */ /* TODO: Will this really work with partial buffers? */ if (!(*tif->tif_seek)(tif, row - tif->tif_row)) return (0); tif->tif_row = row; } return (1); } int TIFFReadScanline(TIFF* tif, void* buf, uint32 row, uint16 sample) { int e; if (!TIFFCheckRead(tif, 0)) return (-1); if( (e = TIFFSeek(tif, row, sample)) != 0) { /* * Decompress desired row into user buffer. */ e = (*tif->tif_decoderow) (tif, (uint8*) buf, tif->tif_scanlinesize, sample); /* we are now poised at the beginning of the next row */ tif->tif_row = row + 1; if (e) (*tif->tif_postdecode)(tif, (uint8*) buf, tif->tif_scanlinesize); } return (e > 0 ? 1 : -1); } /* * Calculate the strip size according to the number of * rows in the strip (check for truncated last strip on any * of the separations). */ static tmsize_t TIFFReadEncodedStripGetStripSize(TIFF* tif, uint32 strip, uint16* pplane) { static const char module[] = "TIFFReadEncodedStrip"; TIFFDirectory *td = &tif->tif_dir; uint32 rowsperstrip; uint32 stripsperplane; uint32 stripinplane; uint32 rows; tmsize_t stripsize; if (!TIFFCheckRead(tif,0)) return((tmsize_t)(-1)); if (strip>=td->td_nstrips) { TIFFErrorExt(tif->tif_clientdata,module, "%lu: Strip out of range, max %lu",(unsigned long)strip, (unsigned long)td->td_nstrips); return((tmsize_t)(-1)); } rowsperstrip=td->td_rowsperstrip; if (rowsperstrip>td->td_imagelength) rowsperstrip=td->td_imagelength; stripsperplane= TIFFhowmany_32_maxuint_compat(td->td_imagelength, rowsperstrip); stripinplane=(strip%stripsperplane); if( pplane ) *pplane=(uint16)(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 strip, void* buf, tmsize_t size) { static const char module[] = "TIFFReadEncodedStrip"; TIFFDirectory *td = &tif->tif_dir; tmsize_t stripsize; uint16 plane; 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) ) { 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); (*tif->tif_postdecode)(tif,buf,stripsize); return (stripsize); } if ((size!=(tmsize_t)(-1))&&(sizetif_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 = _TIFFmalloc(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 strip, void **buf, tmsize_t bufsizetoalloc, tmsize_t size_to_read) { tmsize_t this_stripsize; uint16 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_readtif_clientdata, 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 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))) { TIFFErrorExt(tif->tif_clientdata, module, "Seek error at scanline %lu, strip %lu", (unsigned long) tif->tif_row, (unsigned long) strip); return ((tmsize_t)(-1)); } cc = TIFFReadFile(tif, buf, size); if (cc != size) { #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__)) TIFFErrorExt(tif->tif_clientdata, module, "Read error at scanline %lu; got %I64u bytes, expected %I64u", (unsigned long) tif->tif_row, (unsigned __int64) cc, (unsigned __int64) size); #else TIFFErrorExt(tif->tif_clientdata, module, "Read error at scanline %lu; got %llu bytes, expected %llu", (unsigned long) tif->tif_row, (unsigned long long) cc, (unsigned long long) size); #endif return ((tmsize_t)(-1)); } } else { tmsize_t ma = 0; tmsize_t n; if ((TIFFGetStrileOffset(tif, strip) > (uint64)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) { #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__)) TIFFErrorExt(tif->tif_clientdata, module, "Read error at scanline %lu, strip %lu; got %I64u bytes, expected %I64u", (unsigned long) tif->tif_row, (unsigned long) strip, (unsigned __int64) n, (unsigned __int64) size); #else TIFFErrorExt(tif->tif_clientdata, module, "Read error at scanline %lu, strip %lu; got %llu bytes, expected %llu", (unsigned long) tif->tif_row, (unsigned long) strip, (unsigned long long) n, (unsigned long long) size); #endif return ((tmsize_t)(-1)); } _TIFFmemcpy(buf, tif->tif_base + ma, size); } return (size); } static tmsize_t TIFFReadRawStripOrTile2(TIFF* tif, uint32 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 ) { TIFFErrorExt(tif->tif_clientdata, module, "Seek error at scanline %lu, strip %lu", (unsigned long) tif->tif_row, (unsigned long) strip_or_tile); } else { TIFFErrorExt(tif->tif_clientdata, module, "Seek error at row %lu, col %lu, tile %lu", (unsigned long) tif->tif_row, (unsigned long) tif->tif_col, (unsigned long) 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 strip, void* buf, tmsize_t size) { static const char module[] = "TIFFReadRawStrip"; TIFFDirectory *td = &tif->tif_dir; uint64 bytecount64; tmsize_t bytecountm; if (!TIFFCheckRead(tif, 0)) return ((tmsize_t)(-1)); if (strip >= td->td_nstrips) { TIFFErrorExt(tif->tif_clientdata, module, "%lu: Strip out of range, max %lu", (unsigned long) strip, (unsigned long) td->td_nstrips); return ((tmsize_t)(-1)); } if (tif->tif_flags&TIFF_NOREADRAW) { TIFFErrorExt(tif->tif_clientdata, 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)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 NoSanitizeSubUInt64(uint64 a, uint64 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 strip) { static const char module[] = "TIFFFillStrip"; TIFFDirectory *td = &tif->tif_dir; if ((tif->tif_flags&TIFF_NOREADRAW)==0) { uint64 bytecount = TIFFGetStrileByteCount(tif, strip); if( bytecount == 0 || bytecount > (uint64)TIFF_INT64_MAX ) { #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__)) TIFFErrorExt(tif->tif_clientdata, module, "Invalid strip byte count %I64u, strip %lu", (unsigned __int64) bytecount, (unsigned long) strip); #else TIFFErrorExt(tif->tif_clientdata, module, "Invalid strip byte count %llu, strip %lu", (unsigned long long) bytecount, (unsigned long) strip); #endif 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)stripsize ) { uint64 newbytecount = (uint64)stripsize * 10 + 4096; if( newbytecount == 0 || newbytecount > (uint64)TIFF_INT64_MAX ) { #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__)) TIFFWarningExt(tif->tif_clientdata, module, "Too large strip byte count %I64u, strip %lu. Limiting to %I64u", (unsigned __int64) bytecount, (unsigned long) strip, (unsigned __int64) newbytecount); #else TIFFErrorExt(tif->tif_clientdata, module, "Too large strip byte count %llu, strip %lu. Limiting to %llu", (unsigned long long) bytecount, (unsigned long) strip, (unsigned long long) newbytecount); #endif 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)tif->tif_size || TIFFGetStrileOffset(tif, strip) > (uint64)tif->tif_size - bytecount) { /* * This error message might seem strange, but * it's what would happen if a read were done * instead. */ #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__)) TIFFErrorExt(tif->tif_clientdata, module, "Read error on strip %lu; " "got %I64u bytes, expected %I64u", (unsigned long) strip, (unsigned __int64) NoSanitizeSubUInt64(tif->tif_size, TIFFGetStrileOffset(tif, strip)), (unsigned __int64) bytecount); #else TIFFErrorExt(tif->tif_clientdata, module, "Read error on strip %lu; " "got %llu bytes, expected %llu", (unsigned long) strip, (unsigned long long) NoSanitizeSubUInt64(tif->tif_size, TIFFGetStrileOffset(tif, strip)), (unsigned long long) bytecount); #endif 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) { _TIFFfree(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)bytecountm!=bytecount) { TIFFErrorExt(tif->tif_clientdata,module,"Integer overflow"); return(0); } if (bytecountm > tif->tif_rawdatasize) { tif->tif_curstrip = NOSTRIP; if ((tif->tif_flags & TIFF_MYBUFFER) == 0) { TIFFErrorExt(tif->tif_clientdata, module, "Data buffer too small to hold strip %lu", (unsigned long) 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 x, uint32 y, uint32 z, uint16 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 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) { TIFFErrorExt(tif->tif_clientdata, module, "%lu: Tile out of range, max %lu", (unsigned long) tile, (unsigned long) 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*) buf, size, (uint16)(tile/td->td_stripsperimage))) { (*tif->tif_postdecode)(tif, (uint8*) buf, size); return (size); } else return ((tmsize_t)(-1)); } /* Variant of TIFFReadTile() that does * * if *buf == NULL, *buf = _TIFFmalloc(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 x, uint32 y, uint32 z, uint16 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 = _TIFFmalloc(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 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) { TIFFErrorExt(tif->tif_clientdata, module, "%lu: Tile out of range, max %lu", (unsigned long) tile, (unsigned long) td->td_nstrips); return ((tmsize_t)(-1)); } if (!TIFFFillTile(tif,tile)) return((tmsize_t)(-1)); *buf = _TIFFmalloc(bufsizetoalloc); if (*buf == NULL) { TIFFErrorExt(tif->tif_clientdata, 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*) *buf, size_to_read, (uint16)(tile/td->td_stripsperimage))) { (*tif->tif_postdecode)(tif, (uint8*) *buf, size_to_read); return (size_to_read); } else return ((tmsize_t)(-1)); } static tmsize_t TIFFReadRawTile1(TIFF* tif, uint32 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))) { TIFFErrorExt(tif->tif_clientdata, module, "Seek error at row %lu, col %lu, tile %lu", (unsigned long) tif->tif_row, (unsigned long) tif->tif_col, (unsigned long) tile); return ((tmsize_t)(-1)); } cc = TIFFReadFile(tif, buf, size); if (cc != size) { #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__)) TIFFErrorExt(tif->tif_clientdata, module, "Read error at row %lu, col %lu; got %I64u bytes, expected %I64u", (unsigned long) tif->tif_row, (unsigned long) tif->tif_col, (unsigned __int64) cc, (unsigned __int64) size); #else TIFFErrorExt(tif->tif_clientdata, module, "Read error at row %lu, col %lu; got %llu bytes, expected %llu", (unsigned long) tif->tif_row, (unsigned long) tif->tif_col, (unsigned long long) cc, (unsigned long long) size); #endif 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)TIFF_TMSIZE_T_MAX)||(ma>tif->tif_size)) n=0; else if ((mbtif->tif_size)) n=tif->tif_size-ma; else n=size; if (n!=size) { #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__)) TIFFErrorExt(tif->tif_clientdata, module, "Read error at row %lu, col %lu, tile %lu; got %I64u bytes, expected %I64u", (unsigned long) tif->tif_row, (unsigned long) tif->tif_col, (unsigned long) tile, (unsigned __int64) n, (unsigned __int64) size); #else TIFFErrorExt(tif->tif_clientdata, module, "Read error at row %lu, col %lu, tile %lu; got %llu bytes, expected %llu", (unsigned long) tif->tif_row, (unsigned long) tif->tif_col, (unsigned long) tile, (unsigned long long) n, (unsigned long long) size); #endif 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 tile, void* buf, tmsize_t size) { static const char module[] = "TIFFReadRawTile"; TIFFDirectory *td = &tif->tif_dir; uint64 bytecount64; tmsize_t bytecountm; if (!TIFFCheckRead(tif, 1)) return ((tmsize_t)(-1)); if (tile >= td->td_nstrips) { TIFFErrorExt(tif->tif_clientdata, module, "%lu: Tile out of range, max %lu", (unsigned long) tile, (unsigned long) td->td_nstrips); return ((tmsize_t)(-1)); } if (tif->tif_flags&TIFF_NOREADRAW) { TIFFErrorExt(tif->tif_clientdata, 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)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 tile) { static const char module[] = "TIFFFillTile"; TIFFDirectory *td = &tif->tif_dir; if ((tif->tif_flags&TIFF_NOREADRAW)==0) { uint64 bytecount = TIFFGetStrileByteCount(tif, tile); if( bytecount == 0 || bytecount > (uint64)TIFF_INT64_MAX ) { #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__)) TIFFErrorExt(tif->tif_clientdata, module, "%I64u: Invalid tile byte count, tile %lu", (unsigned __int64) bytecount, (unsigned long) tile); #else TIFFErrorExt(tif->tif_clientdata, module, "%llu: Invalid tile byte count, tile %lu", (unsigned long long) bytecount, (unsigned long) tile); #endif 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)stripsize ) { uint64 newbytecount = (uint64)stripsize * 10 + 4096; if( newbytecount == 0 || newbytecount > (uint64)TIFF_INT64_MAX ) { #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__)) TIFFWarningExt(tif->tif_clientdata, module, "Too large tile byte count %I64u, tile %lu. Limiting to %I64u", (unsigned __int64) bytecount, (unsigned long) tile, (unsigned __int64) newbytecount); #else TIFFErrorExt(tif->tif_clientdata, module, "Too large tile byte count %llu, tile %lu. Limiting to %llu", (unsigned long long) bytecount, (unsigned long) tile, (unsigned long long) newbytecount); #endif 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)tif->tif_size || TIFFGetStrileOffset(tif, tile) > (uint64)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) { _TIFFfree(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)bytecountm!=bytecount) { TIFFErrorExt(tif->tif_clientdata,module,"Integer overflow"); return(0); } if (bytecountm > tif->tif_rawdatasize) { tif->tif_curtile = NOTILE; if ((tif->tif_flags & TIFF_MYBUFFER) == 0) { TIFFErrorExt(tif->tif_clientdata, module, "Data buffer too small to hold tile %lu", (unsigned long) 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) _TIFFfree(tif->tif_rawdata); tif->tif_rawdata = NULL; tif->tif_rawdatasize = 0; } if (bp) { tif->tif_rawdatasize = size; tif->tif_rawdata = (uint8*) bp; tif->tif_flags &= ~TIFF_MYBUFFER; } else { tif->tif_rawdatasize = (tmsize_t)TIFFroundup_64((uint64)size, 1024); if (tif->tif_rawdatasize==0) { TIFFErrorExt(tif->tif_clientdata, 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*) _TIFFcalloc(1, tif->tif_rawdatasize); tif->tif_flags |= TIFF_MYBUFFER; } if (tif->tif_rawdata == NULL) { TIFFErrorExt(tif->tif_clientdata, module, "No space for data buffer at scanline %lu", (unsigned long) 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 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)(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 tile) { static const char module[] = "TIFFStartTile"; TIFFDirectory *td = &tif->tif_dir; uint32 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) { TIFFErrorExt(tif->tif_clientdata,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) { TIFFErrorExt(tif->tif_clientdata,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)(tile/td->td_stripsperimage))); } static int TIFFCheckRead(TIFF* tif, int tiles) { if (tif->tif_mode == O_WRONLY) { TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "File not open for reading"); return (0); } if (tiles ^ isTiled(tif)) { TIFFErrorExt(tif->tif_clientdata, 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 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 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) { TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "File not open for reading"); return 0; } if (tif->tif_flags&TIFF_NOREADRAW) { TIFFErrorExt(tif->tif_clientdata, 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*) outbuf, outsize, (uint16)(strile/td->td_stripsperimage)) ) { ret = 0; } } else { uint32 rowsperstrip=td->td_rowsperstrip; uint32 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*) outbuf, outsize, (uint16)(strile/stripsperplane)) ) { ret = 0; } } if( ret ) { (*tif->tif_postdecode)(tif, (uint8*) outbuf, outsize); } if (!isFillOrder(tif, td->td_fillorder) && (tif->tif_flags & TIFF_NOBITREV) == 0) { TIFFReverseBits(inbuf, insize); } tif->tif_flags = old_tif_flags; 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* buf, tmsize_t cc) { (void) tif; (void) buf; (void) cc; } void _TIFFSwab16BitData(TIFF* tif, uint8* buf, tmsize_t cc) { (void) tif; assert((cc & 1) == 0); TIFFSwabArrayOfShort((uint16*) buf, cc/2); } void _TIFFSwab24BitData(TIFF* tif, uint8* buf, tmsize_t cc) { (void) tif; assert((cc % 3) == 0); TIFFSwabArrayOfTriples((uint8*) buf, cc/3); } void _TIFFSwab32BitData(TIFF* tif, uint8* buf, tmsize_t cc) { (void) tif; assert((cc & 3) == 0); TIFFSwabArrayOfLong((uint32*) buf, cc/4); } void _TIFFSwab64BitData(TIFF* tif, uint8* buf, tmsize_t cc) { (void) tif; assert((cc & 7) == 0); TIFFSwabArrayOfDouble((double*) buf, cc/8); } /* vim: set ts=8 sts=8 sw=8 noet: */ /* * Local Variables: * mode: c * c-basic-offset: 8 * fill-column: 78 * End: */