--- /dev/null
+/* $Id: tif_read.c,v 1.1 2005-06-17 13:54:52 vp153 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 */
+ TIFFError(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) {
+ TIFFError(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) {
+ TIFFError(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;
+
+ if (!isMapped(tif)) {
+ tsize_t cc;
+
+ if (!SeekOK(tif, td->td_stripoffset[strip])) {
+ TIFFError(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) {
+ TIFFError(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) {
+ TIFFError(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;
+ tsize_t bytecount;
+
+ if (!TIFFCheckRead(tif, 0))
+ return ((tsize_t) -1);
+ if (strip >= td->td_nstrips) {
+ TIFFError(tif->tif_name, "%lu: Strip out of range, max %lu",
+ (unsigned long) strip, (unsigned long) td->td_nstrips);
+ return ((tsize_t) -1);
+ }
+ bytecount = td->td_stripbytecount[strip];
+ if (bytecount <= 0) {
+ TIFFError(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 && 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;
+ tsize_t bytecount;
+
+ bytecount = td->td_stripbytecount[strip];
+ if (bytecount <= 0) {
+ TIFFError(tif->tif_name,
+ "%lu: Invalid strip byte count, strip %lu",
+ (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;
+ if ( td->td_stripoffset[strip] + bytecount > tif->tif_size) {
+ /*
+ * This error message might seem strange, but it's
+ * what would happen if a read were done instead.
+ */
+ TIFFError(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 > tif->tif_rawdatasize) {
+ tif->tif_curstrip = NOSTRIP;
+ if ((tif->tif_flags & TIFF_MYBUFFER) == 0) {
+ TIFFError(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 (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) {
+ TIFFError(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;
+
+ if (!isMapped(tif)) {
+ tsize_t cc;
+
+ if (!SeekOK(tif, td->td_stripoffset[tile])) {
+ TIFFError(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) {
+ TIFFError(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) {
+ TIFFError(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;
+ tsize_t bytecount;
+
+ if (!TIFFCheckRead(tif, 1))
+ return ((tsize_t) -1);
+ if (tile >= td->td_nstrips) {
+ TIFFError(tif->tif_name, "%lu: Tile out of range, max %lu",
+ (unsigned long) tile, (unsigned long) td->td_nstrips);
+ return ((tsize_t) -1);
+ }
+ bytecount = td->td_stripbytecount[tile];
+ if (size != (tsize_t) -1 && 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;
+ tsize_t bytecount;
+
+ bytecount = td->td_stripbytecount[tile];
+ if (bytecount <= 0) {
+ TIFFError(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;
+ if ( td->td_stripoffset[tile] + bytecount > tif->tif_size) {
+ 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 > tif->tif_rawdatasize) {
+ tif->tif_curtile = NOTILE;
+ if ((tif->tif_flags & TIFF_MYBUFFER) == 0) {
+ TIFFError(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 (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";
+
+ 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) {
+ TIFFError(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;
+ 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;
+ 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) {
+ TIFFError(tif->tif_name, "File not open for reading");
+ return (0);
+ }
+ if (tiles ^ isTiled(tif)) {
+ TIFFError(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
+_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: */
projects / opencv / blobdiff