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/* $Header: /home/terralib/src/tiff/tif_read.c,v 1.3 2004/03/19 11:51:25 lubia Exp $ */
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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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* 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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* 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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* 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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* Scanline-oriented Read Support
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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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* Seek to a random row+sample in a file.
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TIFFSeek(TIFF* tif, uint32 row, tsample_t sample)
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register TIFFDirectory *td = &tif->tif_dir;
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if (row >= td->td_imagelength) { /* out of range */
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TIFFError(tif->tif_name, "%lu: Row out of range, max %lu",
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(u_long) row, (u_long) td->td_imagelength);
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if (td->td_planarconfig == PLANARCONFIG_SEPARATE) {
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if (sample >= td->td_samplesperpixel) {
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TIFFError(tif->tif_name,
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"%lu: Sample out of range, max %lu",
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(u_long) sample, (u_long) td->td_samplesperpixel);
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strip = sample*td->td_stripsperimage + row/td->td_rowsperstrip;
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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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} else if (row < tif->tif_row) {
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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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* 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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if (!TIFFStartStrip(tif, strip))
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if (row != tif->tif_row) {
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* Seek forward to the desired row.
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if (!(*tif->tif_seek)(tif, row - tif->tif_row))
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TIFFReadScanline(TIFF* tif, tdata_t buf, uint32 row, tsample_t sample)
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if (!TIFFCheckRead(tif, 0))
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if( (e = TIFFSeek(tif, row, sample)) != 0) {
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* Decompress desired row into user buffer.
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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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(*tif->tif_postdecode)(tif, (tidata_t) buf,
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tif->tif_scanlinesize);
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return (e > 0 ? 1 : -1);
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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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TIFFReadEncodedStrip(TIFF* tif, tstrip_t strip, tdata_t buf, tsize_t size)
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TIFFDirectory *td = &tif->tif_dir;
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tstrip_t sep_strip, strips_per_sep;
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if (!TIFFCheckRead(tif, 0))
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if (strip >= td->td_nstrips) {
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TIFFError(tif->tif_name, "%ld: Strip out of range, max %ld",
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(long) strip, (long) td->td_nstrips);
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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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if( td->td_rowsperstrip >= td->td_imagelength )
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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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else if (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 ((tsize_t) -1);
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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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TIFFDirectory *td = &tif->tif_dir;
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if (!isMapped(tif)) {
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if (!SeekOK(tif, td->td_stripoffset[strip])) {
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"%s: Seek error at scanline %lu, strip %lu",
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(u_long) tif->tif_row, (u_long) strip);
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cc = TIFFReadFile(tif, buf, size);
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"%s: Read error at scanline %lu; got %lu bytes, expected %lu",
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(u_long) tif->tif_row,
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if (td->td_stripoffset[strip] + size > tif->tif_size) {
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"%s: Read error at scanline %lu, strip %lu; got %lu bytes, expected %lu",
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(u_long) tif->tif_row,
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(u_long) tif->tif_size - td->td_stripoffset[strip],
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_TIFFmemcpy(buf, tif->tif_base + td->td_stripoffset[strip], size);
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* Read a strip of data from the file.
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TIFFReadRawStrip(TIFF* tif, tstrip_t strip, tdata_t buf, tsize_t size)
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static const char module[] = "TIFFReadRawStrip";
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TIFFDirectory *td = &tif->tif_dir;
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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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TIFFError(tif->tif_name, "%lu: Strip out of range, max %lu",
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(u_long) strip, (u_long) td->td_nstrips);
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return ((tsize_t) -1);
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bytecount = td->td_stripbytecount[strip];
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if (bytecount <= 0) {
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TIFFError(tif->tif_name,
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"%lu: Invalid strip byte count, strip %lu",
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(u_long) bytecount, (u_long) strip);
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return ((tsize_t) -1);
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if (size != (tsize_t)-1 && size < bytecount)
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return (TIFFReadRawStrip1(tif, strip, buf, bytecount, module));
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* Read the specified strip and setup for decoding.
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* The data buffer is expanded, as necessary, to
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* hold the strip's data.
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TIFFFillStrip(TIFF* tif, tstrip_t strip)
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static const char module[] = "TIFFFillStrip";
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TIFFDirectory *td = &tif->tif_dir;
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bytecount = td->td_stripbytecount[strip];
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if (bytecount <= 0) {
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TIFFError(tif->tif_name,
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"%lu: Invalid strip byte count, strip %lu",
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(u_long) bytecount, (u_long) strip);
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(isFillOrder(tif, td->td_fillorder) || (tif->tif_flags & TIFF_NOBITREV))) {
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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 going
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* to handle this operation itself. In this case, avoid
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* copying the raw data and instead just reference the
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* data from the memory mapped file image. This assumes
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* that the decompression routines do not modify the
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* contents of the raw data buffer (if they try to,
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* the application will get a fault since the file is
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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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if ( td->td_stripoffset[strip] + bytecount > tif->tif_size) {
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* This error message might seem strange, but it's
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* what would happen if a read were done instead.
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"%s: Read error on strip %lu; got %lu bytes, expected %lu",
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(u_long) tif->tif_size - td->td_stripoffset[strip],
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tif->tif_curstrip = NOSTRIP;
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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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* Expand raw data buffer, if needed, to
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* hold data strip coming from file
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* (perhaps should set upper bound on
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* the size of a buffer we'll use?).
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if (bytecount > 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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"%s: Data buffer too small to hold strip %lu",
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tif->tif_name, (u_long) strip);
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if (!TIFFReadBufferSetup(tif, 0,
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TIFFroundup(bytecount, 1024)))
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if (TIFFReadRawStrip1(tif, strip, (u_char *)tif->tif_rawdata,
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bytecount, module) != bytecount)
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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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return (TIFFStartStrip(tif, strip));
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* Tile-oriented Read Support
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* Contributed by Nancy Cam (Silicon Graphics).
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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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TIFFReadTile(TIFF* tif,
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tdata_t buf, uint32 x, uint32 y, uint32 z, tsample_t s)
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if (!TIFFCheckRead(tif, 1) || !TIFFCheckTile(tif, x, y, z, s))
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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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* Read a tile of data and decompress the specified
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* amount into the user-supplied buffer.
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TIFFReadEncodedTile(TIFF* tif, ttile_t tile, tdata_t buf, tsize_t size)
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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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if (tile >= td->td_nstrips) {
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TIFFError(tif->tif_name, "%ld: Tile out of range, max %ld",
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(long) tile, (u_long) td->td_nstrips);
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if (size == (tsize_t) -1)
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else if (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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TIFFReadRawTile1(TIFF* tif,
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ttile_t tile, tdata_t buf, tsize_t size, const char* module)
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TIFFDirectory *td = &tif->tif_dir;
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if (!isMapped(tif)) {
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if (!SeekOK(tif, td->td_stripoffset[tile])) {
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"%s: Seek error at row %ld, col %ld, tile %ld",
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return ((tsize_t) -1);
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cc = TIFFReadFile(tif, buf, size);
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"%s: Read error at row %ld, col %ld; got %lu bytes, expected %lu",
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return ((tsize_t) -1);
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if (td->td_stripoffset[tile] + size > tif->tif_size) {
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"%s: Read error at row %ld, col %ld, tile %ld; got %lu bytes, expected %lu",
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(u_long) tif->tif_size - td->td_stripoffset[tile],
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return ((tsize_t) -1);
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_TIFFmemcpy(buf, tif->tif_base + td->td_stripoffset[tile], size);
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* Read a tile of data from the file.
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TIFFReadRawTile(TIFF* tif, ttile_t tile, tdata_t buf, tsize_t size)
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static const char module[] = "TIFFReadRawTile";
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TIFFDirectory *td = &tif->tif_dir;
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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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TIFFError(tif->tif_name, "%lu: Tile out of range, max %lu",
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(u_long) tile, (u_long) td->td_nstrips);
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return ((tsize_t) -1);
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bytecount = td->td_stripbytecount[tile];
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if (size != (tsize_t) -1 && size < bytecount)
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return (TIFFReadRawTile1(tif, tile, buf, bytecount, module));
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* Read the specified tile and setup for decoding.
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* The data buffer is expanded, as necessary, to
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* hold the tile's data.
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TIFFFillTile(TIFF* tif, ttile_t tile)
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static const char module[] = "TIFFFillTile";
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TIFFDirectory *td = &tif->tif_dir;
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bytecount = td->td_stripbytecount[tile];
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if (bytecount <= 0) {
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TIFFError(tif->tif_name,
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"%lu: Invalid tile byte count, tile %lu",
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(u_long) bytecount, (u_long) tile);
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(isFillOrder(tif, td->td_fillorder) || (tif->tif_flags & TIFF_NOBITREV))) {
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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 going
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* to handle this operation itself. In this case, avoid
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* copying the raw data and instead just reference the
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* data from the memory mapped file image. This assumes
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* that the decompression routines do not modify the
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* contents of the raw data buffer (if they try to,
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* the application will get a fault since the file is
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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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if ( td->td_stripoffset[tile] + bytecount > tif->tif_size) {
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tif->tif_curtile = NOTILE;
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tif->tif_rawdatasize = bytecount;
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tif->tif_rawdata = tif->tif_base + td->td_stripoffset[tile];
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* Expand raw data buffer, if needed, to
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* hold data tile coming from file
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* (perhaps should set upper bound on
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* the size of a buffer we'll use?).
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if (bytecount > tif->tif_rawdatasize) {
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tif->tif_curtile = NOTILE;
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if ((tif->tif_flags & TIFF_MYBUFFER) == 0) {
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"%s: Data buffer too small to hold tile %ld",
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tif->tif_name, (long) tile);
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if (!TIFFReadBufferSetup(tif, 0,
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TIFFroundup(bytecount, 1024)))
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if (TIFFReadRawTile1(tif, tile, (u_char *)tif->tif_rawdata,
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bytecount, module) != bytecount)
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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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return (TIFFStartTile(tif, tile));
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* Setup the raw data buffer in preparation for
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* reading a strip of raw data. If the buffer
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* is specified as zero, then a buffer of appropriate
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* size is allocated by the library. Otherwise,
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* the client must guarantee that the buffer is
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* large enough to hold any individual strip of
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TIFFReadBufferSetup(TIFF* tif, tdata_t bp, tsize_t size)
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static const char module[] = "TIFFReadBufferSetup";
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if (tif->tif_rawdata) {
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if (tif->tif_flags & TIFF_MYBUFFER)
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_TIFFfree(tif->tif_rawdata);
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tif->tif_rawdata = NULL;
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tif->tif_rawdatasize = size;
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tif->tif_rawdata = (tidata_t) bp;
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tif->tif_flags &= ~TIFF_MYBUFFER;
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tif->tif_rawdatasize = TIFFroundup(size, 1024);
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tif->tif_rawdata = (tidata_t) _TIFFmalloc(tif->tif_rawdatasize);
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tif->tif_flags |= TIFF_MYBUFFER;
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if (tif->tif_rawdata == NULL) {
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"%s: No space for data buffer at scanline %ld",
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tif->tif_name, (long) tif->tif_row);
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tif->tif_rawdatasize = 0;
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* Set state to appear as if a
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* strip has just been read in.
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TIFFStartStrip(TIFF* tif, tstrip_t strip)
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TIFFDirectory *td = &tif->tif_dir;
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if ((tif->tif_flags & TIFF_CODERSETUP) == 0) {
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if (!(*tif->tif_setupdecode)(tif))
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tif->tif_flags |= TIFF_CODERSETUP;
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tif->tif_curstrip = strip;
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tif->tif_row = (strip % td->td_stripsperimage) * td->td_rowsperstrip;
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tif->tif_rawcp = tif->tif_rawdata;
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tif->tif_rawcc = td->td_stripbytecount[strip];
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return ((*tif->tif_predecode)(tif,
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(tsample_t)(strip / td->td_stripsperimage)));
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* Set state to appear as if a
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* tile has just been read in.
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TIFFStartTile(TIFF* tif, ttile_t tile)
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TIFFDirectory *td = &tif->tif_dir;
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if ((tif->tif_flags & TIFF_CODERSETUP) == 0) {
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if (!(*tif->tif_setupdecode)(tif))
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tif->tif_flags |= TIFF_CODERSETUP;
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tif->tif_curtile = tile;
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(tile % TIFFhowmany(td->td_imagewidth, td->td_tilewidth)) *
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(tile % TIFFhowmany(td->td_imagelength, td->td_tilelength)) *
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tif->tif_rawcp = tif->tif_rawdata;
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tif->tif_rawcc = td->td_stripbytecount[tile];
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return ((*tif->tif_predecode)(tif,
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(tsample_t)(tile/td->td_stripsperimage)));
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TIFFCheckRead(TIFF* tif, int tiles)
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if (tif->tif_mode == O_WRONLY) {
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TIFFError(tif->tif_name, "File not open for reading");
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if (tiles ^ isTiled(tif)) {
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TIFFError(tif->tif_name, tiles ?
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"Can not read tiles from a stripped image" :
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"Can not read scanlines from a tiled image");
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_TIFFNoPostDecode(TIFF* tif, tidata_t buf, tsize_t cc)
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(void) tif; (void) buf; (void) cc;
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_TIFFSwab16BitData(TIFF* tif, tidata_t buf, tsize_t cc)
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assert((cc & 1) == 0);
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TIFFSwabArrayOfShort((uint16*) buf, cc/2);
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_TIFFSwab32BitData(TIFF* tif, tidata_t buf, tsize_t cc)
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assert((cc & 3) == 0);
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TIFFSwabArrayOfLong((uint32*) buf, cc/4);
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_TIFFSwab64BitData(TIFF* tif, tidata_t buf, tsize_t cc)
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assert((cc & 7) == 0);
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TIFFSwabArrayOfDouble((double*) buf, cc/8);
added
removed
src/tiff/tif_read.c
