| /* $Id: tif_read.c,v 1.45 2015-06-07 22:35:40 bfriesen Exp $ */ |
| |
| /* |
| * 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 <stdio.h> |
| |
| 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); |
| |
| #define NOSTRIP ((uint32)(-1)) /* undefined state */ |
| #define NOTILE ((uint32)(-1)) /* undefined state */ |
| |
| 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 cc, to_read; |
| /* tmsize_t bytecountm; */ |
| |
| if (!_TIFFFillStriles( tif ) || !tif->tif_dir.td_stripbytecount) |
| return 0; |
| |
| /* |
| * 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) td->td_stripbytecount[strip]; */ |
| if (read_ahead*2 > 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 (!TIFFReadBufferSetup(tif, 0, read_ahead*2)) |
| 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 = td->td_stripoffset[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? |
| */ |
| to_read = tif->tif_rawdatasize - unused_data; |
| if( (uint64) to_read > td->td_stripbytecount[strip] |
| - tif->tif_rawdataoff - tif->tif_rawdataloaded ) |
| { |
| to_read = (tmsize_t) td->td_stripbytecount[strip] |
| - tif->tif_rawdataoff - tif->tif_rawdataloaded; |
| } |
| |
| assert((tif->tif_flags&TIFF_BUFFERMMAP)==0); |
| cc = TIFFReadFile(tif, tif->tif_rawdata + unused_data, to_read); |
| |
| if (cc != to_read) { |
| #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) to_read); |
| #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) to_read); |
| #endif |
| return 0; |
| } |
| |
| tif->tif_rawdataoff = tif->tif_rawdataoff + tif->tif_rawdataloaded - unused_data ; |
| tif->tif_rawdataloaded = unused_data + to_read; |
| |
| 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 ) |
| 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) |
| if (!_TIFFFillStriles( tif ) || !tif->tif_dir.td_stripbytecount) |
| return 0; |
| whole_strip = tif->tif_dir.td_stripbytecount[strip] < 10 |
| || isMapped(tif); |
| #else |
| whole_strip = 1; |
| #endif |
| |
| if( !whole_strip ) |
| { |
| read_ahead = tif->tif_scanlinesize * 16 + 5000; |
| } |
| |
| /* |
| * 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 < td->td_stripbytecount[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); |
| } |
| |
| /* |
| * 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; |
| uint32 rowsperstrip; |
| uint32 stripsperplane; |
| uint32 stripinplane; |
| uint16 plane; |
| 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)); |
| } |
| /* |
| * Calculate the strip size according to the number of |
| * rows in the strip (check for truncated last strip on any |
| * of the separations). |
| */ |
| rowsperstrip=td->td_rowsperstrip; |
| if (rowsperstrip>td->td_imagelength) |
| rowsperstrip=td->td_imagelength; |
| stripsperplane=((td->td_imagelength+rowsperstrip-1)/rowsperstrip); |
| stripinplane=(strip%stripsperplane); |
| plane=(strip/stripsperplane); |
| rows=td->td_imagelength-stripinplane*rowsperstrip; |
| if (rows>rowsperstrip) |
| rows=rowsperstrip; |
| stripsize=TIFFVStripSize(tif,rows); |
| if (stripsize==0) |
| return((tmsize_t)(-1)); |
| 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); |
| } |
| |
| static tmsize_t |
| TIFFReadRawStrip1(TIFF* tif, uint32 strip, void* buf, tmsize_t size, |
| const char* module) |
| { |
| TIFFDirectory *td = &tif->tif_dir; |
| |
| if (!_TIFFFillStriles( tif )) |
| return ((tmsize_t)(-1)); |
| |
| assert((tif->tif_flags&TIFF_NOREADRAW)==0); |
| if (!isMapped(tif)) { |
| tmsize_t cc; |
| |
| if (!SeekOK(tif, td->td_stripoffset[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,mb; |
| tmsize_t n; |
| ma=(tmsize_t)td->td_stripoffset[strip]; |
| mb=ma+size; |
| if (((uint64)ma!=td->td_stripoffset[strip])||(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) { |
| #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); |
| } |
| |
| /* |
| * 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 bytecount; |
| 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)); |
| } |
| bytecount = td->td_stripbytecount[strip]; |
| if ((int64)bytecount <= 0) { |
| #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__)) |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "%I64u: Invalid strip byte count, strip %lu", |
| (unsigned __int64) bytecount, |
| (unsigned long) strip); |
| #else |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "%llu: Invalid strip byte count, strip %lu", |
| (unsigned long long) bytecount, |
| (unsigned long) strip); |
| #endif |
| return ((tmsize_t)(-1)); |
| } |
| bytecountm = (tmsize_t)bytecount; |
| if ((uint64)bytecountm!=bytecount) { |
| TIFFErrorExt(tif->tif_clientdata, module, "Integer overflow"); |
| return ((tmsize_t)(-1)); |
| } |
| if (size != (tmsize_t)(-1) && size < bytecountm) |
| bytecountm = size; |
| return (TIFFReadRawStrip1(tif, strip, buf, bytecountm, module)); |
| } |
| |
| /* |
| * 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 (!_TIFFFillStriles( tif ) || !tif->tif_dir.td_stripbytecount) |
| return 0; |
| |
| if ((tif->tif_flags&TIFF_NOREADRAW)==0) |
| { |
| uint64 bytecount = td->td_stripbytecount[strip]; |
| if ((int64)bytecount <= 0) { |
| #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); |
| } |
| 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; |
| /* |
| * We must check for overflow, potentially causing |
| * an OOB read. Instead of simple |
| * |
| * td->td_stripoffset[strip]+bytecount > tif->tif_size |
| * |
| * comparison (which can overflow) we do the following |
| * two comparisons: |
| */ |
| if (bytecount > (uint64)tif->tif_size || |
| td->td_stripoffset[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) tif->tif_size - td->td_stripoffset[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) tif->tif_size - td->td_stripoffset[strip], |
| (unsigned long long) bytecount); |
| #endif |
| tif->tif_curstrip = NOSTRIP; |
| return (0); |
| } |
| tif->tif_rawdatasize = (tmsize_t)bytecount; |
| tif->tif_rawdata = tif->tif_base + (tmsize_t)td->td_stripoffset[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 (!TIFFReadBufferSetup(tif, 0, bytecountm)) |
| return (0); |
| } |
| if (tif->tif_flags&TIFF_BUFFERMMAP) { |
| tif->tif_curstrip = NOSTRIP; |
| if (!TIFFReadBufferSetup(tif, 0, bytecountm)) |
| return (0); |
| } |
| if (TIFFReadRawStrip1(tif, strip, tif->tif_rawdata, |
| 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)); |
| } |
| 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)); |
| } |
| |
| static tmsize_t |
| TIFFReadRawTile1(TIFF* tif, uint32 tile, void* buf, tmsize_t size, const char* module) |
| { |
| TIFFDirectory *td = &tif->tif_dir; |
| |
| if (!_TIFFFillStriles( tif )) |
| return ((tmsize_t)(-1)); |
| |
| assert((tif->tif_flags&TIFF_NOREADRAW)==0); |
| if (!isMapped(tif)) { |
| tmsize_t cc; |
| |
| if (!SeekOK(tif, td->td_stripoffset[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)td->td_stripoffset[tile]; |
| mb=ma+size; |
| if (((uint64)ma!=td->td_stripoffset[tile])||(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) { |
| #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 = td->td_stripbytecount[tile]; |
| if (size != (tmsize_t)(-1) && (uint64)size < bytecount64) |
| bytecount64 = (uint64)size; |
| bytecountm = (tmsize_t)bytecount64; |
| if ((uint64)bytecountm!=bytecount64) |
| { |
| TIFFErrorExt(tif->tif_clientdata,module,"Integer overflow"); |
| 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 (!_TIFFFillStriles( tif ) || !tif->tif_dir.td_stripbytecount) |
| return 0; |
| |
| if ((tif->tif_flags&TIFF_NOREADRAW)==0) |
| { |
| uint64 bytecount = td->td_stripbytecount[tile]; |
| if ((int64)bytecount <= 0) { |
| #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); |
| } |
| 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; |
| /* |
| * We must check for overflow, potentially causing |
| * an OOB read. Instead of simple |
| * |
| * td->td_stripoffset[tile]+bytecount > tif->tif_size |
| * |
| * comparison (which can overflow) we do the following |
| * two comparisons: |
| */ |
| if (bytecount > (uint64)tif->tif_size || |
| td->td_stripoffset[tile] > (uint64)tif->tif_size - bytecount) { |
| tif->tif_curtile = NOTILE; |
| return (0); |
| } |
| tif->tif_rawdatasize = (tmsize_t)bytecount; |
| tif->tif_rawdata = |
| tif->tif_base + (tmsize_t)td->td_stripoffset[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 (!TIFFReadBufferSetup(tif, 0, bytecountm)) |
| return (0); |
| } |
| if (tif->tif_flags&TIFF_BUFFERMMAP) { |
| tif->tif_curtile = NOTILE; |
| if (!TIFFReadBufferSetup(tif, 0, bytecountm)) |
| return (0); |
| } |
| |
| if (TIFFReadRawTile1(tif, tile, tif->tif_rawdata, |
| 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, |
| 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); |
| } |
| tif->tif_rawdata = (uint8*) _TIFFmalloc(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 (!_TIFFFillStriles( tif ) || !tif->tif_dir.td_stripbytecount) |
| return 0; |
| |
| 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; |
| tif->tif_rawcc = (tmsize_t)td->td_stripbytecount[strip]; |
| } |
| return ((*tif->tif_predecode)(tif, |
| (uint16)(strip / td->td_stripsperimage))); |
| } |
| |
| /* |
| * 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 (!_TIFFFillStriles( tif ) || !tif->tif_dir.td_stripbytecount) |
| return 0; |
| |
| 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; |
| tif->tif_rawcc = (tmsize_t)td->td_stripbytecount[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 stripped image" : |
| "Can not read scanlines from a tiled image"); |
| return (0); |
| } |
| return (1); |
| } |
| |
| 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: |
| */ |
