| /* $Id: tif_read.c,v 1.27 2009/09/06 13:11:29 drolon 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*, tstrip_t); |
| int TIFFFillTile(TIFF*, ttile_t); |
| static int TIFFStartStrip(TIFF*, tstrip_t); |
| static int TIFFStartTile(TIFF*, ttile_t); |
| static int TIFFCheckRead(TIFF*, int); |
| |
| #define NOSTRIP ((tstrip_t) -1) /* undefined state */ |
| #define NOTILE ((ttile_t) -1) /* undefined state */ |
| |
| /* |
| * Seek to a random row+sample in a file. |
| */ |
| static int |
| TIFFSeek(TIFF* tif, uint32 row, tsample_t sample) |
| { |
| register TIFFDirectory *td = &tif->tif_dir; |
| tstrip_t strip; |
| |
| 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 = sample*td->td_stripsperimage + row/td->td_rowsperstrip; |
| } else |
| strip = row / td->td_rowsperstrip; |
| if (strip != tif->tif_curstrip) { /* different strip, refill */ |
| if (!TIFFFillStrip(tif, strip)) |
| return (0); |
| } else 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 (!TIFFStartStrip(tif, strip)) |
| return (0); |
| } |
| if (row != tif->tif_row) { |
| /* |
| * Seek forward to the desired row. |
| */ |
| if (!(*tif->tif_seek)(tif, row - tif->tif_row)) |
| return (0); |
| tif->tif_row = row; |
| } |
| return (1); |
| } |
| |
| int |
| TIFFReadScanline(TIFF* tif, tdata_t buf, uint32 row, tsample_t 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, (tidata_t) 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, (tidata_t) buf, |
| tif->tif_scanlinesize); |
| } |
| return (e > 0 ? 1 : -1); |
| } |
| |
| /* |
| * Read a strip of data and decompress the specified |
| * amount into the user-supplied buffer. |
| */ |
| tsize_t |
| TIFFReadEncodedStrip(TIFF* tif, tstrip_t strip, tdata_t buf, tsize_t size) |
| { |
| TIFFDirectory *td = &tif->tif_dir; |
| uint32 nrows; |
| tsize_t stripsize; |
| tstrip_t sep_strip, strips_per_sep; |
| |
| if (!TIFFCheckRead(tif, 0)) |
| return (-1); |
| if (strip >= td->td_nstrips) { |
| TIFFErrorExt(tif->tif_clientdata, tif->tif_name, |
| "%ld: Strip out of range, max %ld", |
| (long) strip, (long) td->td_nstrips); |
| return (-1); |
| } |
| /* |
| * Calculate the strip size according to the number of |
| * rows in the strip (check for truncated last strip on any |
| * of the separations). |
| */ |
| if( td->td_rowsperstrip >= td->td_imagelength ) |
| strips_per_sep = 1; |
| else |
| strips_per_sep = (td->td_imagelength+td->td_rowsperstrip-1) |
| / td->td_rowsperstrip; |
| |
| sep_strip = strip % strips_per_sep; |
| |
| if (sep_strip != strips_per_sep-1 || |
| (nrows = td->td_imagelength % td->td_rowsperstrip) == 0) |
| nrows = td->td_rowsperstrip; |
| |
| stripsize = TIFFVStripSize(tif, nrows); |
| if (size == (tsize_t) -1) |
| size = stripsize; |
| else if (size > stripsize) |
| size = stripsize; |
| if (TIFFFillStrip(tif, strip) |
| && (*tif->tif_decodestrip)(tif, (tidata_t) buf, size, |
| (tsample_t)(strip / td->td_stripsperimage)) > 0 ) { |
| (*tif->tif_postdecode)(tif, (tidata_t) buf, size); |
| return (size); |
| } else |
| return ((tsize_t) -1); |
| } |
| |
| static tsize_t |
| TIFFReadRawStrip1(TIFF* tif, |
| tstrip_t strip, tdata_t buf, tsize_t size, const char* module) |
| { |
| TIFFDirectory *td = &tif->tif_dir; |
| |
| assert((tif->tif_flags&TIFF_NOREADRAW)==0); |
| if (!isMapped(tif)) { |
| tsize_t cc; |
| |
| if (!SeekOK(tif, td->td_stripoffset[strip])) { |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "%s: Seek error at scanline %lu, strip %lu", |
| tif->tif_name, |
| (unsigned long) tif->tif_row, (unsigned long) strip); |
| return (-1); |
| } |
| cc = TIFFReadFile(tif, buf, size); |
| if (cc != size) { |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "%s: Read error at scanline %lu; got %lu bytes, expected %lu", |
| tif->tif_name, |
| (unsigned long) tif->tif_row, |
| (unsigned long) cc, |
| (unsigned long) size); |
| return (-1); |
| } |
| } else { |
| if (td->td_stripoffset[strip] + size > tif->tif_size) { |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "%s: Read error at scanline %lu, strip %lu; got %lu bytes, expected %lu", |
| tif->tif_name, |
| (unsigned long) tif->tif_row, |
| (unsigned long) strip, |
| (unsigned long) tif->tif_size - td->td_stripoffset[strip], |
| (unsigned long) size); |
| return (-1); |
| } |
| _TIFFmemcpy(buf, tif->tif_base + td->td_stripoffset[strip], |
| size); |
| } |
| return (size); |
| } |
| |
| /* |
| * Read a strip of data from the file. |
| */ |
| tsize_t |
| TIFFReadRawStrip(TIFF* tif, tstrip_t strip, tdata_t buf, tsize_t size) |
| { |
| static const char module[] = "TIFFReadRawStrip"; |
| TIFFDirectory *td = &tif->tif_dir; |
| /* |
| * FIXME: butecount should have tsize_t type, but for now libtiff |
| * defines tsize_t as a signed 32-bit integer and we are losing |
| * ability to read arrays larger than 2^31 bytes. So we are using |
| * uint32 instead of tsize_t here. |
| */ |
| uint32 bytecount; |
| |
| if (!TIFFCheckRead(tif, 0)) |
| return ((tsize_t) -1); |
| if (strip >= td->td_nstrips) { |
| TIFFErrorExt(tif->tif_clientdata, tif->tif_name, |
| "%lu: Strip out of range, max %lu", |
| (unsigned long) strip, |
| (unsigned long) td->td_nstrips); |
| return ((tsize_t) -1); |
| } |
| if (tif->tif_flags&TIFF_NOREADRAW) |
| { |
| TIFFErrorExt(tif->tif_clientdata, tif->tif_name, |
| "Compression scheme does not support access to raw uncompressed data"); |
| return ((tsize_t) -1); |
| } |
| bytecount = td->td_stripbytecount[strip]; |
| if (bytecount <= 0) { |
| TIFFErrorExt(tif->tif_clientdata, tif->tif_name, |
| "%lu: Invalid strip byte count, strip %lu", |
| (unsigned long) bytecount, (unsigned long) strip); |
| return ((tsize_t) -1); |
| } |
| if (size != (tsize_t)-1 && (uint32)size < bytecount) |
| bytecount = size; |
| return (TIFFReadRawStrip1(tif, strip, buf, bytecount, 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, tstrip_t strip) |
| { |
| static const char module[] = "TIFFFillStrip"; |
| TIFFDirectory *td = &tif->tif_dir; |
| |
| if ((tif->tif_flags&TIFF_NOREADRAW)==0) |
| { |
| /* |
| * FIXME: butecount should have tsize_t type, but for now |
| * libtiff defines tsize_t as a signed 32-bit integer and we |
| * are losing ability to read arrays larger than 2^31 bytes. |
| * So we are using uint32 instead of tsize_t here. |
| */ |
| uint32 bytecount = td->td_stripbytecount[strip]; |
| if (bytecount <= 0) { |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "%s: Invalid strip byte count %lu, strip %lu", |
| tif->tif_name, (unsigned long) bytecount, |
| (unsigned long) strip); |
| 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_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 > tif->tif_size || |
| td->td_stripoffset[strip] > tif->tif_size - bytecount) { |
| /* |
| * This error message might seem strange, but |
| * it's what would happen if a read were done |
| * instead. |
| */ |
| TIFFErrorExt(tif->tif_clientdata, module, |
| |
| "%s: Read error on strip %lu; " |
| "got %lu bytes, expected %lu", |
| tif->tif_name, (unsigned long) strip, |
| (unsigned long) tif->tif_size - td->td_stripoffset[strip], |
| (unsigned long) bytecount); |
| tif->tif_curstrip = NOSTRIP; |
| return (0); |
| } |
| tif->tif_rawdatasize = bytecount; |
| tif->tif_rawdata = tif->tif_base + td->td_stripoffset[strip]; |
| } 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?). |
| */ |
| if (bytecount > (uint32)tif->tif_rawdatasize) { |
| tif->tif_curstrip = NOSTRIP; |
| if ((tif->tif_flags & TIFF_MYBUFFER) == 0) { |
| TIFFErrorExt(tif->tif_clientdata, |
| module, |
| "%s: Data buffer too small to hold strip %lu", |
| tif->tif_name, |
| (unsigned long) strip); |
| return (0); |
| } |
| if (!TIFFReadBufferSetup(tif, 0, |
| TIFFroundup(bytecount, 1024))) |
| return (0); |
| } |
| if ((uint32)TIFFReadRawStrip1(tif, strip, |
| (unsigned char *)tif->tif_rawdata, |
| bytecount, module) != bytecount) |
| return (0); |
| if (!isFillOrder(tif, td->td_fillorder) && |
| (tif->tif_flags & TIFF_NOBITREV) == 0) |
| TIFFReverseBits(tif->tif_rawdata, bytecount); |
| } |
| } |
| 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. |
| */ |
| tsize_t |
| TIFFReadTile(TIFF* tif, |
| tdata_t buf, uint32 x, uint32 y, uint32 z, tsample_t s) |
| { |
| if (!TIFFCheckRead(tif, 1) || !TIFFCheckTile(tif, x, y, z, s)) |
| return (-1); |
| return (TIFFReadEncodedTile(tif, |
| TIFFComputeTile(tif, x, y, z, s), buf, (tsize_t) -1)); |
| } |
| |
| /* |
| * Read a tile of data and decompress the specified |
| * amount into the user-supplied buffer. |
| */ |
| tsize_t |
| TIFFReadEncodedTile(TIFF* tif, ttile_t tile, tdata_t buf, tsize_t size) |
| { |
| TIFFDirectory *td = &tif->tif_dir; |
| tsize_t tilesize = tif->tif_tilesize; |
| |
| if (!TIFFCheckRead(tif, 1)) |
| return (-1); |
| if (tile >= td->td_nstrips) { |
| TIFFErrorExt(tif->tif_clientdata, tif->tif_name, |
| "%ld: Tile out of range, max %ld", |
| (long) tile, (unsigned long) td->td_nstrips); |
| return (-1); |
| } |
| if (size == (tsize_t) -1) |
| size = tilesize; |
| else if (size > tilesize) |
| size = tilesize; |
| if (TIFFFillTile(tif, tile) && (*tif->tif_decodetile)(tif, |
| (tidata_t) buf, size, (tsample_t)(tile/td->td_stripsperimage))) { |
| (*tif->tif_postdecode)(tif, (tidata_t) buf, size); |
| return (size); |
| } else |
| return (-1); |
| } |
| |
| static tsize_t |
| TIFFReadRawTile1(TIFF* tif, |
| ttile_t tile, tdata_t buf, tsize_t size, const char* module) |
| { |
| TIFFDirectory *td = &tif->tif_dir; |
| |
| assert((tif->tif_flags&TIFF_NOREADRAW)==0); |
| if (!isMapped(tif)) { |
| tsize_t cc; |
| |
| if (!SeekOK(tif, td->td_stripoffset[tile])) { |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "%s: Seek error at row %ld, col %ld, tile %ld", |
| tif->tif_name, |
| (long) tif->tif_row, |
| (long) tif->tif_col, |
| (long) tile); |
| return ((tsize_t) -1); |
| } |
| cc = TIFFReadFile(tif, buf, size); |
| if (cc != size) { |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "%s: Read error at row %ld, col %ld; got %lu bytes, expected %lu", |
| tif->tif_name, |
| (long) tif->tif_row, |
| (long) tif->tif_col, |
| (unsigned long) cc, |
| (unsigned long) size); |
| return ((tsize_t) -1); |
| } |
| } else { |
| if (td->td_stripoffset[tile] + size > tif->tif_size) { |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "%s: Read error at row %ld, col %ld, tile %ld; got %lu bytes, expected %lu", |
| tif->tif_name, |
| (long) tif->tif_row, |
| (long) tif->tif_col, |
| (long) tile, |
| (unsigned long) tif->tif_size - td->td_stripoffset[tile], |
| (unsigned long) size); |
| return ((tsize_t) -1); |
| } |
| _TIFFmemcpy(buf, tif->tif_base + td->td_stripoffset[tile], size); |
| } |
| return (size); |
| } |
| |
| /* |
| * Read a tile of data from the file. |
| */ |
| tsize_t |
| TIFFReadRawTile(TIFF* tif, ttile_t tile, tdata_t buf, tsize_t size) |
| { |
| static const char module[] = "TIFFReadRawTile"; |
| TIFFDirectory *td = &tif->tif_dir; |
| /* |
| * FIXME: butecount should have tsize_t type, but for now libtiff |
| * defines tsize_t as a signed 32-bit integer and we are losing |
| * ability to read arrays larger than 2^31 bytes. So we are using |
| * uint32 instead of tsize_t here. |
| */ |
| uint32 bytecount; |
| |
| if (!TIFFCheckRead(tif, 1)) |
| return ((tsize_t) -1); |
| if (tile >= td->td_nstrips) { |
| TIFFErrorExt(tif->tif_clientdata, tif->tif_name, |
| "%lu: Tile out of range, max %lu", |
| (unsigned long) tile, (unsigned long) td->td_nstrips); |
| return ((tsize_t) -1); |
| } |
| if (tif->tif_flags&TIFF_NOREADRAW) |
| { |
| TIFFErrorExt(tif->tif_clientdata, tif->tif_name, |
| "Compression scheme does not support access to raw uncompressed data"); |
| return ((tsize_t) -1); |
| } |
| bytecount = td->td_stripbytecount[tile]; |
| if (size != (tsize_t) -1 && (uint32)size < bytecount) |
| bytecount = size; |
| return (TIFFReadRawTile1(tif, tile, buf, bytecount, 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, ttile_t tile) |
| { |
| static const char module[] = "TIFFFillTile"; |
| TIFFDirectory *td = &tif->tif_dir; |
| |
| if ((tif->tif_flags&TIFF_NOREADRAW)==0) |
| { |
| /* |
| * FIXME: butecount should have tsize_t type, but for now |
| * libtiff defines tsize_t as a signed 32-bit integer and we |
| * are losing ability to read arrays larger than 2^31 bytes. |
| * So we are using uint32 instead of tsize_t here. |
| */ |
| uint32 bytecount = td->td_stripbytecount[tile]; |
| if (bytecount <= 0) { |
| TIFFErrorExt(tif->tif_clientdata, tif->tif_name, |
| "%lu: Invalid tile byte count, tile %lu", |
| (unsigned long) bytecount, (unsigned long) tile); |
| 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_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 > tif->tif_size || |
| td->td_stripoffset[tile] > tif->tif_size - bytecount) { |
| tif->tif_curtile = NOTILE; |
| return (0); |
| } |
| tif->tif_rawdatasize = bytecount; |
| tif->tif_rawdata = |
| tif->tif_base + td->td_stripoffset[tile]; |
| } 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?). |
| */ |
| if (bytecount > (uint32)tif->tif_rawdatasize) { |
| tif->tif_curtile = NOTILE; |
| if ((tif->tif_flags & TIFF_MYBUFFER) == 0) { |
| TIFFErrorExt(tif->tif_clientdata, |
| module, |
| "%s: Data buffer too small to hold tile %ld", |
| tif->tif_name, |
| (long) tile); |
| return (0); |
| } |
| if (!TIFFReadBufferSetup(tif, 0, |
| TIFFroundup(bytecount, 1024))) |
| return (0); |
| } |
| if ((uint32)TIFFReadRawTile1(tif, tile, |
| (unsigned char *)tif->tif_rawdata, |
| bytecount, module) != bytecount) |
| return (0); |
| if (!isFillOrder(tif, td->td_fillorder) && |
| (tif->tif_flags & TIFF_NOBITREV) == 0) |
| TIFFReverseBits(tif->tif_rawdata, bytecount); |
| } |
| } |
| 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, tdata_t bp, tsize_t size) |
| { |
| static const char module[] = "TIFFReadBufferSetup"; |
| |
| assert((tif->tif_flags&TIFF_NOREADRAW)==0); |
| if (tif->tif_rawdata) { |
| if (tif->tif_flags & TIFF_MYBUFFER) |
| _TIFFfree(tif->tif_rawdata); |
| tif->tif_rawdata = NULL; |
| } |
| if (bp) { |
| tif->tif_rawdatasize = size; |
| tif->tif_rawdata = (tidata_t) bp; |
| tif->tif_flags &= ~TIFF_MYBUFFER; |
| } else { |
| tif->tif_rawdatasize = TIFFroundup(size, 1024); |
| tif->tif_rawdata = (tidata_t) _TIFFmalloc(tif->tif_rawdatasize); |
| tif->tif_flags |= TIFF_MYBUFFER; |
| } |
| if (tif->tif_rawdata == NULL) { |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "%s: No space for data buffer at scanline %ld", |
| tif->tif_name, (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, tstrip_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; |
| if (tif->tif_flags&TIFF_NOREADRAW) |
| { |
| tif->tif_rawcp = NULL; |
| tif->tif_rawcc = 0; |
| } |
| else |
| { |
| tif->tif_rawcp = tif->tif_rawdata; |
| tif->tif_rawcc = td->td_stripbytecount[strip]; |
| } |
| return ((*tif->tif_predecode)(tif, |
| (tsample_t)(strip / td->td_stripsperimage))); |
| } |
| |
| /* |
| * Set state to appear as if a |
| * tile has just been read in. |
| */ |
| static int |
| TIFFStartTile(TIFF* tif, ttile_t tile) |
| { |
| 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_curtile = tile; |
| tif->tif_row = |
| (tile % TIFFhowmany(td->td_imagewidth, td->td_tilewidth)) * |
| td->td_tilelength; |
| tif->tif_col = |
| (tile % TIFFhowmany(td->td_imagelength, td->td_tilelength)) * |
| td->td_tilewidth; |
| if (tif->tif_flags&TIFF_NOREADRAW) |
| { |
| tif->tif_rawcp = NULL; |
| tif->tif_rawcc = 0; |
| } |
| else |
| { |
| tif->tif_rawcp = tif->tif_rawdata; |
| tif->tif_rawcc = td->td_stripbytecount[tile]; |
| } |
| return ((*tif->tif_predecode)(tif, |
| (tsample_t)(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, tidata_t buf, tsize_t cc) |
| { |
| (void) tif; (void) buf; (void) cc; |
| } |
| |
| void |
| _TIFFSwab16BitData(TIFF* tif, tidata_t buf, tsize_t cc) |
| { |
| (void) tif; |
| assert((cc & 1) == 0); |
| TIFFSwabArrayOfShort((uint16*) buf, cc/2); |
| } |
| |
| void |
| _TIFFSwab24BitData(TIFF* tif, tidata_t buf, tsize_t cc) |
| { |
| (void) tif; |
| assert((cc % 3) == 0); |
| TIFFSwabArrayOfTriples((uint8*) buf, cc/3); |
| } |
| |
| void |
| _TIFFSwab32BitData(TIFF* tif, tidata_t buf, tsize_t cc) |
| { |
| (void) tif; |
| assert((cc & 3) == 0); |
| TIFFSwabArrayOfLong((uint32*) buf, cc/4); |
| } |
| |
| void |
| _TIFFSwab64BitData(TIFF* tif, tidata_t buf, tsize_t cc) |
| { |
| (void) tif; |
| assert((cc & 7) == 0); |
| TIFFSwabArrayOfDouble((double*) buf, cc/8); |
| } |
| |
| /* vim: set ts=8 sts=8 sw=8 noet: */ |