751 lines
21 KiB
C
751 lines
21 KiB
C
/* $Id: tif_read.c,v 1.16.2.3 2010-06-09 14:32:47 bfriesen Exp $ */
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/*
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* Copyright (c) 1988-1997 Sam Leffler
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* Copyright (c) 1991-1997 Silicon Graphics, Inc.
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*
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* Permission to use, copy, modify, distribute, and sell this software and
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* its documentation for any purpose is hereby granted without fee, provided
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* that (i) the above copyright notices and this permission notice appear in
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* all copies of the software and related documentation, and (ii) the names of
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* Sam Leffler and Silicon Graphics may not be used in any advertising or
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* publicity relating to the software without the specific, prior written
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* permission of Sam Leffler and Silicon Graphics.
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*
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* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
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* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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*
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* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
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* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
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* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
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* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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/*
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* TIFF Library.
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* Scanline-oriented Read Support
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*/
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#include "tiffiop.h"
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#include <stdio.h>
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int TIFFFillStrip(TIFF*, tstrip_t);
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int TIFFFillTile(TIFF*, ttile_t);
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static int TIFFStartStrip(TIFF*, tstrip_t);
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static int TIFFStartTile(TIFF*, ttile_t);
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static int TIFFCheckRead(TIFF*, int);
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#define NOSTRIP ((tstrip_t) -1) /* undefined state */
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#define NOTILE ((ttile_t) -1) /* undefined state */
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/*
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* Seek to a random row+sample in a file.
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*/
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static int
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TIFFSeek(TIFF* tif, uint32 row, tsample_t sample)
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{
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register TIFFDirectory *td = &tif->tif_dir;
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tstrip_t strip;
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if (row >= td->td_imagelength) { /* out of range */
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TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
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"%lu: Row out of range, max %lu",
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(unsigned long) row,
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(unsigned long) td->td_imagelength);
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return (0);
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}
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if (td->td_planarconfig == PLANARCONFIG_SEPARATE) {
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if (sample >= td->td_samplesperpixel) {
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TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
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"%lu: Sample out of range, max %lu",
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(unsigned long) sample, (unsigned long) td->td_samplesperpixel);
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return (0);
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}
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strip = sample*td->td_stripsperimage + row/td->td_rowsperstrip;
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} else
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strip = row / td->td_rowsperstrip;
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if (strip != tif->tif_curstrip) { /* different strip, refill */
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if (!TIFFFillStrip(tif, strip))
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return (0);
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} else if (row < tif->tif_row) {
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/*
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* Moving backwards within the same strip: backup
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* to the start and then decode forward (below).
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*
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* NB: If you're planning on lots of random access within a
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* strip, it's better to just read and decode the entire
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* strip, and then access the decoded data in a random fashion.
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*/
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if (!TIFFStartStrip(tif, strip))
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return (0);
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}
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if (row != tif->tif_row) {
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/*
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* Seek forward to the desired row.
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*/
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if (!(*tif->tif_seek)(tif, row - tif->tif_row))
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return (0);
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tif->tif_row = row;
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}
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return (1);
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}
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int
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TIFFReadScanline(TIFF* tif, tdata_t buf, uint32 row, tsample_t sample)
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{
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int e;
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if (!TIFFCheckRead(tif, 0))
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return (-1);
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if( (e = TIFFSeek(tif, row, sample)) != 0) {
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/*
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* Decompress desired row into user buffer.
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*/
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e = (*tif->tif_decoderow)
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(tif, (tidata_t) buf, tif->tif_scanlinesize, sample);
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/* we are now poised at the beginning of the next row */
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tif->tif_row = row + 1;
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if (e)
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(*tif->tif_postdecode)(tif, (tidata_t) buf,
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tif->tif_scanlinesize);
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}
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return (e > 0 ? 1 : -1);
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}
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/*
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* Read a strip of data and decompress the specified
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* amount into the user-supplied buffer.
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*/
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tsize_t
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TIFFReadEncodedStrip(TIFF* tif, tstrip_t strip, tdata_t buf, tsize_t size)
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{
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TIFFDirectory *td = &tif->tif_dir;
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uint32 nrows;
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tsize_t stripsize;
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tstrip_t sep_strip, strips_per_sep;
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if (!TIFFCheckRead(tif, 0))
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return (-1);
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if (strip >= td->td_nstrips) {
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TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
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"%ld: Strip out of range, max %ld",
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(long) strip, (long) td->td_nstrips);
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return (-1);
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}
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/*
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* Calculate the strip size according to the number of
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* rows in the strip (check for truncated last strip on any
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* of the separations).
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*/
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if( td->td_rowsperstrip >= td->td_imagelength )
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strips_per_sep = 1;
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else
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strips_per_sep = (td->td_imagelength+td->td_rowsperstrip-1)
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/ td->td_rowsperstrip;
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sep_strip = strip % strips_per_sep;
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if (sep_strip != strips_per_sep-1 ||
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(nrows = td->td_imagelength % td->td_rowsperstrip) == 0)
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nrows = td->td_rowsperstrip;
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stripsize = TIFFVStripSize(tif, nrows);
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if (size == (tsize_t) -1)
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size = stripsize;
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else if (size > stripsize)
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size = stripsize;
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if (TIFFFillStrip(tif, strip)
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&& (*tif->tif_decodestrip)(tif, (tidata_t) buf, size,
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(tsample_t)(strip / td->td_stripsperimage)) > 0 ) {
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(*tif->tif_postdecode)(tif, (tidata_t) buf, size);
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return (size);
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} else
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return ((tsize_t) -1);
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}
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static tsize_t
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TIFFReadRawStrip1(TIFF* tif,
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tstrip_t strip, tdata_t buf, tsize_t size, const char* module)
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{
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TIFFDirectory *td = &tif->tif_dir;
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assert((tif->tif_flags&TIFF_NOREADRAW)==0);
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if (!isMapped(tif)) {
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tsize_t cc;
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if (!SeekOK(tif, td->td_stripoffset[strip])) {
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TIFFErrorExt(tif->tif_clientdata, module,
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"%s: Seek error at scanline %lu, strip %lu",
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tif->tif_name,
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(unsigned long) tif->tif_row, (unsigned long) strip);
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return (-1);
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}
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cc = TIFFReadFile(tif, buf, size);
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if (cc != size) {
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TIFFErrorExt(tif->tif_clientdata, module,
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"%s: Read error at scanline %lu; got %lu bytes, expected %lu",
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tif->tif_name,
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(unsigned long) tif->tif_row,
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(unsigned long) cc,
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(unsigned long) size);
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return (-1);
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}
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} else {
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if (td->td_stripoffset[strip] + size > tif->tif_size) {
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TIFFErrorExt(tif->tif_clientdata, module,
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"%s: Read error at scanline %lu, strip %lu; got %lu bytes, expected %lu",
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tif->tif_name,
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(unsigned long) tif->tif_row,
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(unsigned long) strip,
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(unsigned long) tif->tif_size - td->td_stripoffset[strip],
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(unsigned long) size);
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return (-1);
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}
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_TIFFmemcpy(buf, tif->tif_base + td->td_stripoffset[strip],
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size);
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}
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return (size);
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}
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/*
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* Read a strip of data from the file.
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*/
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tsize_t
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TIFFReadRawStrip(TIFF* tif, tstrip_t strip, tdata_t buf, tsize_t size)
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{
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static const char module[] = "TIFFReadRawStrip";
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TIFFDirectory *td = &tif->tif_dir;
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/*
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* FIXME: butecount should have tsize_t type, but for now libtiff
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* defines tsize_t as a signed 32-bit integer and we are losing
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* ability to read arrays larger than 2^31 bytes. So we are using
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* uint32 instead of tsize_t here.
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*/
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uint32 bytecount;
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if (!TIFFCheckRead(tif, 0))
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return ((tsize_t) -1);
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if (strip >= td->td_nstrips) {
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TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
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"%lu: Strip out of range, max %lu",
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(unsigned long) strip,
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(unsigned long) td->td_nstrips);
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return ((tsize_t) -1);
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}
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if (tif->tif_flags&TIFF_NOREADRAW)
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{
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TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
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"Compression scheme does not support access to raw uncompressed data");
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return ((tsize_t) -1);
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}
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bytecount = td->td_stripbytecount[strip];
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if (bytecount <= 0) {
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TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
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"%lu: Invalid strip byte count, strip %lu",
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(unsigned long) bytecount, (unsigned long) strip);
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return ((tsize_t) -1);
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}
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if (size != (tsize_t)-1 && (uint32)size < bytecount)
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bytecount = size;
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return (TIFFReadRawStrip1(tif, strip, buf, bytecount, module));
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}
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/*
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* Read the specified strip and setup for decoding. The data buffer is
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* expanded, as necessary, to hold the strip's data.
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*/
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int
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TIFFFillStrip(TIFF* tif, tstrip_t strip)
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{
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static const char module[] = "TIFFFillStrip";
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TIFFDirectory *td = &tif->tif_dir;
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if ((tif->tif_flags&TIFF_NOREADRAW)==0)
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{
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/*
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* FIXME: butecount should have tsize_t type, but for now
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* libtiff defines tsize_t as a signed 32-bit integer and we
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* are losing ability to read arrays larger than 2^31 bytes.
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* So we are using uint32 instead of tsize_t here.
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*/
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uint32 bytecount = td->td_stripbytecount[strip];
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if (bytecount <= 0) {
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TIFFErrorExt(tif->tif_clientdata, module,
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"%s: Invalid strip byte count %lu, strip %lu",
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tif->tif_name, (unsigned long) bytecount,
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(unsigned long) strip);
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return (0);
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}
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if (isMapped(tif) &&
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(isFillOrder(tif, td->td_fillorder)
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|| (tif->tif_flags & TIFF_NOBITREV))) {
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/*
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* The image is mapped into memory and we either don't
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* need to flip bits or the compression routine is
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* going to handle this operation itself. In this
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* case, avoid copying the raw data and instead just
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* reference the data from the memory mapped file
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* image. This assumes that the decompression
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* routines do not modify the contents of the raw data
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* buffer (if they try to, the application will get a
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* fault since the file is mapped read-only).
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*/
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if ((tif->tif_flags & TIFF_MYBUFFER) && tif->tif_rawdata)
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_TIFFfree(tif->tif_rawdata);
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tif->tif_flags &= ~TIFF_MYBUFFER;
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/*
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* We must check for overflow, potentially causing
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* an OOB read. Instead of simple
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*
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* td->td_stripoffset[strip]+bytecount > tif->tif_size
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*
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* comparison (which can overflow) we do the following
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* two comparisons:
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*/
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if (bytecount > tif->tif_size ||
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td->td_stripoffset[strip] > tif->tif_size - bytecount) {
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/*
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* This error message might seem strange, but
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* it's what would happen if a read were done
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* instead.
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*/
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TIFFErrorExt(tif->tif_clientdata, module,
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"%s: Read error on strip %lu; "
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"got %lu bytes, expected %lu",
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tif->tif_name, (unsigned long) strip,
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(unsigned long) tif->tif_size - td->td_stripoffset[strip],
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(unsigned long) bytecount);
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tif->tif_curstrip = NOSTRIP;
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return (0);
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}
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tif->tif_rawdatasize = bytecount;
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tif->tif_rawdata = tif->tif_base + td->td_stripoffset[strip];
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} else {
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/*
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* Expand raw data buffer, if needed, to hold data
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* strip coming from file (perhaps should set upper
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* bound on the size of a buffer we'll use?).
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*/
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if (bytecount > (uint32)tif->tif_rawdatasize) {
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tif->tif_curstrip = NOSTRIP;
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if ((tif->tif_flags & TIFF_MYBUFFER) == 0) {
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TIFFErrorExt(tif->tif_clientdata,
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module,
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"%s: Data buffer too small to hold strip %lu",
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tif->tif_name,
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(unsigned long) strip);
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return (0);
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}
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if (!TIFFReadBufferSetup(tif, 0,
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TIFFroundup(bytecount, 1024)))
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return (0);
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}
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if ((uint32)TIFFReadRawStrip1(tif, strip,
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(unsigned char *)tif->tif_rawdata,
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bytecount, module) != bytecount)
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return (0);
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if (!isFillOrder(tif, td->td_fillorder) &&
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(tif->tif_flags & TIFF_NOBITREV) == 0)
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TIFFReverseBits(tif->tif_rawdata, bytecount);
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}
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}
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return (TIFFStartStrip(tif, strip));
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}
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/*
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* Tile-oriented Read Support
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* Contributed by Nancy Cam (Silicon Graphics).
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*/
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/*
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* Read and decompress a tile of data. The
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* tile is selected by the (x,y,z,s) coordinates.
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*/
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tsize_t
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TIFFReadTile(TIFF* tif,
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tdata_t buf, uint32 x, uint32 y, uint32 z, tsample_t s)
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{
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if (!TIFFCheckRead(tif, 1) || !TIFFCheckTile(tif, x, y, z, s))
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return (-1);
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return (TIFFReadEncodedTile(tif,
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TIFFComputeTile(tif, x, y, z, s), buf, (tsize_t) -1));
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}
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/*
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* Read a tile of data and decompress the specified
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* amount into the user-supplied buffer.
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*/
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tsize_t
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TIFFReadEncodedTile(TIFF* tif, ttile_t tile, tdata_t buf, tsize_t size)
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{
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TIFFDirectory *td = &tif->tif_dir;
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tsize_t tilesize = tif->tif_tilesize;
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if (!TIFFCheckRead(tif, 1))
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return (-1);
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if (tile >= td->td_nstrips) {
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TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
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"%ld: Tile out of range, max %ld",
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(long) tile, (unsigned long) td->td_nstrips);
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return (-1);
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}
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if (size == (tsize_t) -1)
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size = tilesize;
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else if (size > tilesize)
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size = tilesize;
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if (TIFFFillTile(tif, tile) && (*tif->tif_decodetile)(tif,
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(tidata_t) buf, size, (tsample_t)(tile/td->td_stripsperimage))) {
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(*tif->tif_postdecode)(tif, (tidata_t) buf, size);
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return (size);
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} else
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return (-1);
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}
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static tsize_t
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TIFFReadRawTile1(TIFF* tif,
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ttile_t tile, tdata_t buf, tsize_t size, const char* module)
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{
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TIFFDirectory *td = &tif->tif_dir;
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assert((tif->tif_flags&TIFF_NOREADRAW)==0);
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if (!isMapped(tif)) {
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tsize_t cc;
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if (!SeekOK(tif, td->td_stripoffset[tile])) {
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TIFFErrorExt(tif->tif_clientdata, module,
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"%s: Seek error at row %ld, col %ld, tile %ld",
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tif->tif_name,
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(long) tif->tif_row,
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(long) tif->tif_col,
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(long) tile);
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return ((tsize_t) -1);
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}
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cc = TIFFReadFile(tif, buf, size);
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if (cc != size) {
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TIFFErrorExt(tif->tif_clientdata, module,
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"%s: Read error at row %ld, col %ld; got %lu bytes, expected %lu",
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tif->tif_name,
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(long) tif->tif_row,
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(long) tif->tif_col,
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(unsigned long) cc,
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(unsigned long) size);
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return ((tsize_t) -1);
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}
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} else {
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if (td->td_stripoffset[tile] + size > tif->tif_size) {
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TIFFErrorExt(tif->tif_clientdata, module,
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"%s: Read error at row %ld, col %ld, tile %ld; got %lu bytes, expected %lu",
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tif->tif_name,
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(long) tif->tif_row,
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(long) tif->tif_col,
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(long) tile,
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(unsigned long) tif->tif_size - td->td_stripoffset[tile],
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(unsigned long) size);
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return ((tsize_t) -1);
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}
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_TIFFmemcpy(buf, tif->tif_base + td->td_stripoffset[tile], size);
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}
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return (size);
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}
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/*
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* Read a tile of data from the file.
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*/
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tsize_t
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TIFFReadRawTile(TIFF* tif, ttile_t tile, tdata_t buf, tsize_t size)
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{
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static const char module[] = "TIFFReadRawTile";
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TIFFDirectory *td = &tif->tif_dir;
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/*
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* FIXME: butecount should have tsize_t type, but for now libtiff
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* defines tsize_t as a signed 32-bit integer and we are losing
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* ability to read arrays larger than 2^31 bytes. So we are using
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* uint32 instead of tsize_t here.
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*/
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uint32 bytecount;
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if (!TIFFCheckRead(tif, 1))
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return ((tsize_t) -1);
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if (tile >= td->td_nstrips) {
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TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
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"%lu: Tile out of range, max %lu",
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(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);
|
|
if (tif->tif_rawdatasize > 0)
|
|
tif->tif_rawdata = (tidata_t) _TIFFmalloc(tif->tif_rawdatasize);
|
|
tif->tif_flags |= TIFF_MYBUFFER;
|
|
}
|
|
if ((tif->tif_rawdata == NULL) || (tif->tif_rawdatasize == 0)) {
|
|
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: */
|
|
/*
|
|
* Local Variables:
|
|
* mode: c
|
|
* c-basic-offset: 8
|
|
* fill-column: 78
|
|
* End:
|
|
*/
|