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-rwxr-xr-xtiff/libtiff/tif_read.c1086
1 files changed, 1086 insertions, 0 deletions
diff --git a/tiff/libtiff/tif_read.c b/tiff/libtiff/tif_read.c
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--- /dev/null
+++ b/tiff/libtiff/tif_read.c
@@ -0,0 +1,1086 @@
+/* $Id: tif_read.c,v 1.44 2014-12-23 10:15:35 erouault Exp $ */
+
+/*
+ * Copyright (c) 1988-1997 Sam Leffler
+ * Copyright (c) 1991-1997 Silicon Graphics, Inc.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and
+ * its documentation for any purpose is hereby granted without fee, provided
+ * that (i) the above copyright notices and this permission notice appear in
+ * all copies of the software and related documentation, and (ii) the names of
+ * Sam Leffler and Silicon Graphics may not be used in any advertising or
+ * publicity relating to the software without the specific, prior written
+ * permission of Sam Leffler and Silicon Graphics.
+ *
+ * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
+ * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
+ * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
+ * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+ * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
+ * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+
+/*
+ * TIFF Library.
+ * Scanline-oriented Read Support
+ */
+#include "tiffiop.h"
+#include <stdio.h>
+
+int TIFFFillStrip(TIFF* tif, uint32 strip);
+int TIFFFillTile(TIFF* tif, uint32 tile);
+static int TIFFStartStrip(TIFF* tif, uint32 strip);
+static int TIFFStartTile(TIFF* tif, uint32 tile);
+static int TIFFCheckRead(TIFF*, int);
+static tmsize_t
+TIFFReadRawStrip1(TIFF* tif, uint32 strip, void* buf, tmsize_t size,const char* module);
+
+#define NOSTRIP ((uint32)(-1)) /* undefined state */
+#define NOTILE ((uint32)(-1)) /* undefined state */
+
+static int
+TIFFFillStripPartial( TIFF *tif, int strip, tmsize_t read_ahead, int restart )
+{
+ static const char module[] = "TIFFFillStripPartial";
+ register TIFFDirectory *td = &tif->tif_dir;
+ tmsize_t unused_data;
+ uint64 read_offset;
+ tmsize_t cc, to_read;
+ /* tmsize_t bytecountm; */
+
+ if (!_TIFFFillStriles( tif ) || !tif->tif_dir.td_stripbytecount)
+ return 0;
+
+ /*
+ * Expand raw data buffer, if needed, to hold data
+ * strip coming from file (perhaps should set upper
+ * bound on the size of a buffer we'll use?).
+ */
+
+ /* bytecountm=(tmsize_t) td->td_stripbytecount[strip]; */
+ if (read_ahead*2 > tif->tif_rawdatasize) {
+ assert( restart );
+
+ tif->tif_curstrip = NOSTRIP;
+ if ((tif->tif_flags & TIFF_MYBUFFER) == 0) {
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "Data buffer too small to hold part of strip %lu",
+ (unsigned long) strip);
+ return (0);
+ }
+ if (!TIFFReadBufferSetup(tif, 0, read_ahead*2))
+ return (0);
+ }
+
+ if( restart )
+ {
+ tif->tif_rawdataloaded = 0;
+ tif->tif_rawdataoff = 0;
+ }
+
+ /*
+ ** If we are reading more data, move any unused data to the
+ ** start of the buffer.
+ */
+ if( tif->tif_rawdataloaded > 0 )
+ unused_data = tif->tif_rawdataloaded - (tif->tif_rawcp - tif->tif_rawdata);
+ else
+ unused_data = 0;
+
+ if( unused_data > 0 )
+ {
+ assert((tif->tif_flags&TIFF_BUFFERMMAP)==0);
+ memmove( tif->tif_rawdata, tif->tif_rawcp, unused_data );
+ }
+
+ /*
+ ** Seek to the point in the file where more data should be read.
+ */
+ read_offset = td->td_stripoffset[strip]
+ + tif->tif_rawdataoff + tif->tif_rawdataloaded;
+
+ if (!SeekOK(tif, read_offset)) {
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "Seek error at scanline %lu, strip %lu",
+ (unsigned long) tif->tif_row, (unsigned long) strip);
+ return 0;
+ }
+
+ /*
+ ** How much do we want to read?
+ */
+ to_read = tif->tif_rawdatasize - unused_data;
+ if( (uint64) to_read > td->td_stripbytecount[strip]
+ - tif->tif_rawdataoff - tif->tif_rawdataloaded )
+ {
+ to_read = (tmsize_t) td->td_stripbytecount[strip]
+ - tif->tif_rawdataoff - tif->tif_rawdataloaded;
+ }
+
+ assert((tif->tif_flags&TIFF_BUFFERMMAP)==0);
+ cc = TIFFReadFile(tif, tif->tif_rawdata + unused_data, to_read);
+
+ if (cc != to_read) {
+#if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "Read error at scanline %lu; got %I64u bytes, expected %I64u",
+ (unsigned long) tif->tif_row,
+ (unsigned __int64) cc,
+ (unsigned __int64) to_read);
+#else
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "Read error at scanline %lu; got %llu bytes, expected %llu",
+ (unsigned long) tif->tif_row,
+ (unsigned long long) cc,
+ (unsigned long long) to_read);
+#endif
+ return 0;
+ }
+
+ tif->tif_rawdataoff = tif->tif_rawdataoff + tif->tif_rawdataloaded - unused_data ;
+ tif->tif_rawdataloaded = unused_data + to_read;
+
+ tif->tif_rawcp = tif->tif_rawdata;
+
+ if (!isFillOrder(tif, td->td_fillorder) &&
+ (tif->tif_flags & TIFF_NOBITREV) == 0) {
+ assert((tif->tif_flags&TIFF_BUFFERMMAP)==0);
+ TIFFReverseBits(tif->tif_rawdata + unused_data, to_read );
+ }
+
+ /*
+ ** When starting a strip from the beginning we need to
+ ** restart the decoder.
+ */
+ if( restart )
+ return TIFFStartStrip(tif, strip);
+ else
+ return 1;
+}
+
+/*
+ * Seek to a random row+sample in a file.
+ *
+ * Only used by TIFFReadScanline, and is only used on
+ * strip organized files. We do some tricky stuff to try
+ * and avoid reading the whole compressed raw data for big
+ * strips.
+ */
+static int
+TIFFSeek(TIFF* tif, uint32 row, uint16 sample )
+{
+ register TIFFDirectory *td = &tif->tif_dir;
+ uint32 strip;
+ int whole_strip;
+ tmsize_t read_ahead = 0;
+
+ /*
+ ** Establish what strip we are working from.
+ */
+ if (row >= td->td_imagelength) { /* out of range */
+ TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
+ "%lu: Row out of range, max %lu",
+ (unsigned long) row,
+ (unsigned long) td->td_imagelength);
+ return (0);
+ }
+ if (td->td_planarconfig == PLANARCONFIG_SEPARATE) {
+ if (sample >= td->td_samplesperpixel) {
+ TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
+ "%lu: Sample out of range, max %lu",
+ (unsigned long) sample, (unsigned long) td->td_samplesperpixel);
+ return (0);
+ }
+ strip = (uint32)sample*td->td_stripsperimage + row/td->td_rowsperstrip;
+ } else
+ strip = row / td->td_rowsperstrip;
+
+ /*
+ * Do we want to treat this strip as one whole chunk or
+ * read it a few lines at a time?
+ */
+#if defined(CHUNKY_STRIP_READ_SUPPORT)
+ if (!_TIFFFillStriles( tif ) || !tif->tif_dir.td_stripbytecount)
+ return 0;
+ whole_strip = tif->tif_dir.td_stripbytecount[strip] < 10
+ || isMapped(tif);
+#else
+ whole_strip = 1;
+#endif
+
+ if( !whole_strip )
+ {
+ read_ahead = tif->tif_scanlinesize * 16 + 5000;
+ }
+
+ /*
+ * If we haven't loaded this strip, do so now, possibly
+ * only reading the first part.
+ */
+ if (strip != tif->tif_curstrip) { /* different strip, refill */
+
+ if( whole_strip )
+ {
+ if (!TIFFFillStrip(tif, strip))
+ return (0);
+ }
+ else
+ {
+ if( !TIFFFillStripPartial(tif,strip,read_ahead,1) )
+ return 0;
+ }
+ }
+
+ /*
+ ** If we already have some data loaded, do we need to read some more?
+ */
+ else if( !whole_strip )
+ {
+ if( ((tif->tif_rawdata + tif->tif_rawdataloaded) - tif->tif_rawcp) < read_ahead
+ && (uint64) tif->tif_rawdataoff+tif->tif_rawdataloaded < td->td_stripbytecount[strip] )
+ {
+ if( !TIFFFillStripPartial(tif,strip,read_ahead,0) )
+ return 0;
+ }
+ }
+
+ if (row < tif->tif_row) {
+ /*
+ * Moving backwards within the same strip: backup
+ * to the start and then decode forward (below).
+ *
+ * NB: If you're planning on lots of random access within a
+ * strip, it's better to just read and decode the entire
+ * strip, and then access the decoded data in a random fashion.
+ */
+
+ if( tif->tif_rawdataoff != 0 )
+ {
+ if( !TIFFFillStripPartial(tif,strip,read_ahead,1) )
+ return 0;
+ }
+ else
+ {
+ if (!TIFFStartStrip(tif, strip))
+ return (0);
+ }
+ }
+
+ if (row != tif->tif_row) {
+ /*
+ * Seek forward to the desired row.
+ */
+
+ /* TODO: Will this really work with partial buffers? */
+
+ if (!(*tif->tif_seek)(tif, row - tif->tif_row))
+ return (0);
+ tif->tif_row = row;
+ }
+
+ return (1);
+}
+
+int
+TIFFReadScanline(TIFF* tif, void* buf, uint32 row, uint16 sample)
+{
+ int e;
+
+ if (!TIFFCheckRead(tif, 0))
+ return (-1);
+ if( (e = TIFFSeek(tif, row, sample)) != 0) {
+ /*
+ * Decompress desired row into user buffer.
+ */
+ e = (*tif->tif_decoderow)
+ (tif, (uint8*) buf, tif->tif_scanlinesize, sample);
+
+ /* we are now poised at the beginning of the next row */
+ tif->tif_row = row + 1;
+
+ if (e)
+ (*tif->tif_postdecode)(tif, (uint8*) buf,
+ tif->tif_scanlinesize);
+ }
+ return (e > 0 ? 1 : -1);
+}
+
+/*
+ * Read a strip of data and decompress the specified
+ * amount into the user-supplied buffer.
+ */
+tmsize_t
+TIFFReadEncodedStrip(TIFF* tif, uint32 strip, void* buf, tmsize_t size)
+{
+ static const char module[] = "TIFFReadEncodedStrip";
+ TIFFDirectory *td = &tif->tif_dir;
+ uint32 rowsperstrip;
+ uint32 stripsperplane;
+ uint32 stripinplane;
+ uint16 plane;
+ uint32 rows;
+ tmsize_t stripsize;
+ if (!TIFFCheckRead(tif,0))
+ return((tmsize_t)(-1));
+ if (strip>=td->td_nstrips)
+ {
+ TIFFErrorExt(tif->tif_clientdata,module,
+ "%lu: Strip out of range, max %lu",(unsigned long)strip,
+ (unsigned long)td->td_nstrips);
+ return((tmsize_t)(-1));
+ }
+ /*
+ * Calculate the strip size according to the number of
+ * rows in the strip (check for truncated last strip on any
+ * of the separations).
+ */
+ rowsperstrip=td->td_rowsperstrip;
+ if (rowsperstrip>td->td_imagelength)
+ rowsperstrip=td->td_imagelength;
+ stripsperplane=((td->td_imagelength+rowsperstrip-1)/rowsperstrip);
+ stripinplane=(strip%stripsperplane);
+ plane=(strip/stripsperplane);
+ rows=td->td_imagelength-stripinplane*rowsperstrip;
+ if (rows>rowsperstrip)
+ rows=rowsperstrip;
+ stripsize=TIFFVStripSize(tif,rows);
+ if (stripsize==0)
+ return((tmsize_t)(-1));
+ if ((size!=(tmsize_t)(-1))&&(size<stripsize))
+ stripsize=size;
+ if (!TIFFFillStrip(tif,strip))
+ return((tmsize_t)(-1));
+ if ((*tif->tif_decodestrip)(tif,buf,stripsize,plane)<=0)
+ return((tmsize_t)(-1));
+ (*tif->tif_postdecode)(tif,buf,stripsize);
+ return(stripsize);
+}
+
+static tmsize_t
+TIFFReadRawStrip1(TIFF* tif, uint32 strip, void* buf, tmsize_t size,
+ const char* module)
+{
+ TIFFDirectory *td = &tif->tif_dir;
+
+ if (!_TIFFFillStriles( tif ))
+ return ((tmsize_t)(-1));
+
+ assert((tif->tif_flags&TIFF_NOREADRAW)==0);
+ if (!isMapped(tif)) {
+ tmsize_t cc;
+
+ if (!SeekOK(tif, td->td_stripoffset[strip])) {
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "Seek error at scanline %lu, strip %lu",
+ (unsigned long) tif->tif_row, (unsigned long) strip);
+ return ((tmsize_t)(-1));
+ }
+ cc = TIFFReadFile(tif, buf, size);
+ if (cc != size) {
+#if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "Read error at scanline %lu; got %I64u bytes, expected %I64u",
+ (unsigned long) tif->tif_row,
+ (unsigned __int64) cc,
+ (unsigned __int64) size);
+#else
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "Read error at scanline %lu; got %llu bytes, expected %llu",
+ (unsigned long) tif->tif_row,
+ (unsigned long long) cc,
+ (unsigned long long) size);
+#endif
+ return ((tmsize_t)(-1));
+ }
+ } else {
+ tmsize_t ma,mb;
+ tmsize_t n;
+ ma=(tmsize_t)td->td_stripoffset[strip];
+ mb=ma+size;
+ if (((uint64)ma!=td->td_stripoffset[strip])||(ma>tif->tif_size))
+ n=0;
+ else if ((mb<ma)||(mb<size)||(mb>tif->tif_size))
+ n=tif->tif_size-ma;
+ else
+ n=size;
+ if (n!=size) {
+#if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "Read error at scanline %lu, strip %lu; got %I64u bytes, expected %I64u",
+ (unsigned long) tif->tif_row,
+ (unsigned long) strip,
+ (unsigned __int64) n,
+ (unsigned __int64) size);
+#else
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "Read error at scanline %lu, strip %lu; got %llu bytes, expected %llu",
+ (unsigned long) tif->tif_row,
+ (unsigned long) strip,
+ (unsigned long long) n,
+ (unsigned long long) size);
+#endif
+ return ((tmsize_t)(-1));
+ }
+ _TIFFmemcpy(buf, tif->tif_base + ma,
+ size);
+ }
+ return (size);
+}
+
+/*
+ * Read a strip of data from the file.
+ */
+tmsize_t
+TIFFReadRawStrip(TIFF* tif, uint32 strip, void* buf, tmsize_t size)
+{
+ static const char module[] = "TIFFReadRawStrip";
+ TIFFDirectory *td = &tif->tif_dir;
+ uint64 bytecount;
+ tmsize_t bytecountm;
+
+ if (!TIFFCheckRead(tif, 0))
+ return ((tmsize_t)(-1));
+ if (strip >= td->td_nstrips) {
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "%lu: Strip out of range, max %lu",
+ (unsigned long) strip,
+ (unsigned long) td->td_nstrips);
+ return ((tmsize_t)(-1));
+ }
+ if (tif->tif_flags&TIFF_NOREADRAW)
+ {
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "Compression scheme does not support access to raw uncompressed data");
+ return ((tmsize_t)(-1));
+ }
+ bytecount = td->td_stripbytecount[strip];
+ if ((int64)bytecount <= 0) {
+#if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "%I64u: Invalid strip byte count, strip %lu",
+ (unsigned __int64) bytecount,
+ (unsigned long) strip);
+#else
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "%llu: Invalid strip byte count, strip %lu",
+ (unsigned long long) bytecount,
+ (unsigned long) strip);
+#endif
+ return ((tmsize_t)(-1));
+ }
+ bytecountm = (tmsize_t)bytecount;
+ if ((uint64)bytecountm!=bytecount) {
+ TIFFErrorExt(tif->tif_clientdata, module, "Integer overflow");
+ return ((tmsize_t)(-1));
+ }
+ if (size != (tmsize_t)(-1) && size < bytecountm)
+ bytecountm = size;
+ return (TIFFReadRawStrip1(tif, strip, buf, bytecountm, module));
+}
+
+/*
+ * Read the specified strip and setup for decoding. The data buffer is
+ * expanded, as necessary, to hold the strip's data.
+ */
+int
+TIFFFillStrip(TIFF* tif, uint32 strip)
+{
+ static const char module[] = "TIFFFillStrip";
+ TIFFDirectory *td = &tif->tif_dir;
+
+ if (!_TIFFFillStriles( tif ) || !tif->tif_dir.td_stripbytecount)
+ return 0;
+
+ if ((tif->tif_flags&TIFF_NOREADRAW)==0)
+ {
+ uint64 bytecount = td->td_stripbytecount[strip];
+ if ((int64)bytecount <= 0) {
+#if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "Invalid strip byte count %I64u, strip %lu",
+ (unsigned __int64) bytecount,
+ (unsigned long) strip);
+#else
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "Invalid strip byte count %llu, strip %lu",
+ (unsigned long long) bytecount,
+ (unsigned long) strip);
+#endif
+ return (0);
+ }
+ if (isMapped(tif) &&
+ (isFillOrder(tif, td->td_fillorder)
+ || (tif->tif_flags & TIFF_NOBITREV))) {
+ /*
+ * The image is mapped into memory and we either don't
+ * need to flip bits or the compression routine is
+ * going to handle this operation itself. In this
+ * case, avoid copying the raw data and instead just
+ * reference the data from the memory mapped file
+ * image. This assumes that the decompression
+ * routines do not modify the contents of the raw data
+ * buffer (if they try to, the application will get a
+ * fault since the file is mapped read-only).
+ */
+ if ((tif->tif_flags & TIFF_MYBUFFER) && tif->tif_rawdata) {
+ _TIFFfree(tif->tif_rawdata);
+ tif->tif_rawdata = NULL;
+ tif->tif_rawdatasize = 0;
+ }
+ tif->tif_flags &= ~TIFF_MYBUFFER;
+ /*
+ * We must check for overflow, potentially causing
+ * an OOB read. Instead of simple
+ *
+ * td->td_stripoffset[strip]+bytecount > tif->tif_size
+ *
+ * comparison (which can overflow) we do the following
+ * two comparisons:
+ */
+ if (bytecount > (uint64)tif->tif_size ||
+ td->td_stripoffset[strip] > (uint64)tif->tif_size - bytecount) {
+ /*
+ * This error message might seem strange, but
+ * it's what would happen if a read were done
+ * instead.
+ */
+#if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
+ TIFFErrorExt(tif->tif_clientdata, module,
+
+ "Read error on strip %lu; "
+ "got %I64u bytes, expected %I64u",
+ (unsigned long) strip,
+ (unsigned __int64) tif->tif_size - td->td_stripoffset[strip],
+ (unsigned __int64) bytecount);
+#else
+ TIFFErrorExt(tif->tif_clientdata, module,
+
+ "Read error on strip %lu; "
+ "got %llu bytes, expected %llu",
+ (unsigned long) strip,
+ (unsigned long long) tif->tif_size - td->td_stripoffset[strip],
+ (unsigned long long) bytecount);
+#endif
+ tif->tif_curstrip = NOSTRIP;
+ return (0);
+ }
+ tif->tif_rawdatasize = (tmsize_t)bytecount;
+ tif->tif_rawdata = tif->tif_base + (tmsize_t)td->td_stripoffset[strip];
+ tif->tif_rawdataoff = 0;
+ tif->tif_rawdataloaded = (tmsize_t) bytecount;
+
+ /*
+ * When we have tif_rawdata reference directly into the memory mapped file
+ * we need to be pretty careful about how we use the rawdata. It is not
+ * a general purpose working buffer as it normally otherwise is. So we
+ * keep track of this fact to avoid using it improperly.
+ */
+ tif->tif_flags |= TIFF_BUFFERMMAP;
+ } else {
+ /*
+ * Expand raw data buffer, if needed, to hold data
+ * strip coming from file (perhaps should set upper
+ * bound on the size of a buffer we'll use?).
+ */
+ tmsize_t bytecountm;
+ bytecountm=(tmsize_t)bytecount;
+ if ((uint64)bytecountm!=bytecount)
+ {
+ TIFFErrorExt(tif->tif_clientdata,module,"Integer overflow");
+ return(0);
+ }
+ if (bytecountm > tif->tif_rawdatasize) {
+ tif->tif_curstrip = NOSTRIP;
+ if ((tif->tif_flags & TIFF_MYBUFFER) == 0) {
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "Data buffer too small to hold strip %lu",
+ (unsigned long) strip);
+ return (0);
+ }
+ if (!TIFFReadBufferSetup(tif, 0, bytecountm))
+ return (0);
+ }
+ if (tif->tif_flags&TIFF_BUFFERMMAP) {
+ tif->tif_curstrip = NOSTRIP;
+ if (!TIFFReadBufferSetup(tif, 0, bytecountm))
+ return (0);
+ }
+ if (TIFFReadRawStrip1(tif, strip, tif->tif_rawdata,
+ bytecountm, module) != bytecountm)
+ return (0);
+
+ tif->tif_rawdataoff = 0;
+ tif->tif_rawdataloaded = bytecountm;
+
+ if (!isFillOrder(tif, td->td_fillorder) &&
+ (tif->tif_flags & TIFF_NOBITREV) == 0)
+ TIFFReverseBits(tif->tif_rawdata, bytecountm);
+ }
+ }
+ return (TIFFStartStrip(tif, strip));
+}
+
+/*
+ * Tile-oriented Read Support
+ * Contributed by Nancy Cam (Silicon Graphics).
+ */
+
+/*
+ * Read and decompress a tile of data. The
+ * tile is selected by the (x,y,z,s) coordinates.
+ */
+tmsize_t
+TIFFReadTile(TIFF* tif, void* buf, uint32 x, uint32 y, uint32 z, uint16 s)
+{
+ if (!TIFFCheckRead(tif, 1) || !TIFFCheckTile(tif, x, y, z, s))
+ return ((tmsize_t)(-1));
+ return (TIFFReadEncodedTile(tif,
+ TIFFComputeTile(tif, x, y, z, s), buf, (tmsize_t)(-1)));
+}
+
+/*
+ * Read a tile of data and decompress the specified
+ * amount into the user-supplied buffer.
+ */
+tmsize_t
+TIFFReadEncodedTile(TIFF* tif, uint32 tile, void* buf, tmsize_t size)
+{
+ static const char module[] = "TIFFReadEncodedTile";
+ TIFFDirectory *td = &tif->tif_dir;
+ tmsize_t tilesize = tif->tif_tilesize;
+
+ if (!TIFFCheckRead(tif, 1))
+ return ((tmsize_t)(-1));
+ if (tile >= td->td_nstrips) {
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "%lu: Tile out of range, max %lu",
+ (unsigned long) tile, (unsigned long) td->td_nstrips);
+ return ((tmsize_t)(-1));
+ }
+ if (size == (tmsize_t)(-1))
+ size = tilesize;
+ else if (size > tilesize)
+ size = tilesize;
+ if (TIFFFillTile(tif, tile) && (*tif->tif_decodetile)(tif,
+ (uint8*) buf, size, (uint16)(tile/td->td_stripsperimage))) {
+ (*tif->tif_postdecode)(tif, (uint8*) buf, size);
+ return (size);
+ } else
+ return ((tmsize_t)(-1));
+}
+
+static tmsize_t
+TIFFReadRawTile1(TIFF* tif, uint32 tile, void* buf, tmsize_t size, const char* module)
+{
+ TIFFDirectory *td = &tif->tif_dir;
+
+ if (!_TIFFFillStriles( tif ))
+ return ((tmsize_t)(-1));
+
+ assert((tif->tif_flags&TIFF_NOREADRAW)==0);
+ if (!isMapped(tif)) {
+ tmsize_t cc;
+
+ if (!SeekOK(tif, td->td_stripoffset[tile])) {
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "Seek error at row %lu, col %lu, tile %lu",
+ (unsigned long) tif->tif_row,
+ (unsigned long) tif->tif_col,
+ (unsigned long) tile);
+ return ((tmsize_t)(-1));
+ }
+ cc = TIFFReadFile(tif, buf, size);
+ if (cc != size) {
+#if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "Read error at row %lu, col %lu; got %I64u bytes, expected %I64u",
+ (unsigned long) tif->tif_row,
+ (unsigned long) tif->tif_col,
+ (unsigned __int64) cc,
+ (unsigned __int64) size);
+#else
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "Read error at row %lu, col %lu; got %llu bytes, expected %llu",
+ (unsigned long) tif->tif_row,
+ (unsigned long) tif->tif_col,
+ (unsigned long long) cc,
+ (unsigned long long) size);
+#endif
+ return ((tmsize_t)(-1));
+ }
+ } else {
+ tmsize_t ma,mb;
+ tmsize_t n;
+ ma=(tmsize_t)td->td_stripoffset[tile];
+ mb=ma+size;
+ if (((uint64)ma!=td->td_stripoffset[tile])||(ma>tif->tif_size))
+ n=0;
+ else if ((mb<ma)||(mb<size)||(mb>tif->tif_size))
+ n=tif->tif_size-ma;
+ else
+ n=size;
+ if (n!=size) {
+#if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
+ TIFFErrorExt(tif->tif_clientdata, module,
+"Read error at row %lu, col %lu, tile %lu; got %I64u bytes, expected %I64u",
+ (unsigned long) tif->tif_row,
+ (unsigned long) tif->tif_col,
+ (unsigned long) tile,
+ (unsigned __int64) n,
+ (unsigned __int64) size);
+#else
+ TIFFErrorExt(tif->tif_clientdata, module,
+"Read error at row %lu, col %lu, tile %lu; got %llu bytes, expected %llu",
+ (unsigned long) tif->tif_row,
+ (unsigned long) tif->tif_col,
+ (unsigned long) tile,
+ (unsigned long long) n,
+ (unsigned long long) size);
+#endif
+ return ((tmsize_t)(-1));
+ }
+ _TIFFmemcpy(buf, tif->tif_base + ma, size);
+ }
+ return (size);
+}
+
+/*
+ * Read a tile of data from the file.
+ */
+tmsize_t
+TIFFReadRawTile(TIFF* tif, uint32 tile, void* buf, tmsize_t size)
+{
+ static const char module[] = "TIFFReadRawTile";
+ TIFFDirectory *td = &tif->tif_dir;
+ uint64 bytecount64;
+ tmsize_t bytecountm;
+
+ if (!TIFFCheckRead(tif, 1))
+ return ((tmsize_t)(-1));
+ if (tile >= td->td_nstrips) {
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "%lu: Tile out of range, max %lu",
+ (unsigned long) tile, (unsigned long) td->td_nstrips);
+ return ((tmsize_t)(-1));
+ }
+ if (tif->tif_flags&TIFF_NOREADRAW)
+ {
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "Compression scheme does not support access to raw uncompressed data");
+ return ((tmsize_t)(-1));
+ }
+ bytecount64 = td->td_stripbytecount[tile];
+ if (size != (tmsize_t)(-1) && (uint64)size < bytecount64)
+ bytecount64 = (uint64)size;
+ bytecountm = (tmsize_t)bytecount64;
+ if ((uint64)bytecountm!=bytecount64)
+ {
+ TIFFErrorExt(tif->tif_clientdata,module,"Integer overflow");
+ return ((tmsize_t)(-1));
+ }
+ return (TIFFReadRawTile1(tif, tile, buf, bytecountm, module));
+}
+
+/*
+ * Read the specified tile and setup for decoding. The data buffer is
+ * expanded, as necessary, to hold the tile's data.
+ */
+int
+TIFFFillTile(TIFF* tif, uint32 tile)
+{
+ static const char module[] = "TIFFFillTile";
+ TIFFDirectory *td = &tif->tif_dir;
+
+ if (!_TIFFFillStriles( tif ) || !tif->tif_dir.td_stripbytecount)
+ return 0;
+
+ if ((tif->tif_flags&TIFF_NOREADRAW)==0)
+ {
+ uint64 bytecount = td->td_stripbytecount[tile];
+ if ((int64)bytecount <= 0) {
+#if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "%I64u: Invalid tile byte count, tile %lu",
+ (unsigned __int64) bytecount,
+ (unsigned long) tile);
+#else
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "%llu: Invalid tile byte count, tile %lu",
+ (unsigned long long) bytecount,
+ (unsigned long) tile);
+#endif
+ return (0);
+ }
+ if (isMapped(tif) &&
+ (isFillOrder(tif, td->td_fillorder)
+ || (tif->tif_flags & TIFF_NOBITREV))) {
+ /*
+ * The image is mapped into memory and we either don't
+ * need to flip bits or the compression routine is
+ * going to handle this operation itself. In this
+ * case, avoid copying the raw data and instead just
+ * reference the data from the memory mapped file
+ * image. This assumes that the decompression
+ * routines do not modify the contents of the raw data
+ * buffer (if they try to, the application will get a
+ * fault since the file is mapped read-only).
+ */
+ if ((tif->tif_flags & TIFF_MYBUFFER) && tif->tif_rawdata) {
+ _TIFFfree(tif->tif_rawdata);
+ tif->tif_rawdata = NULL;
+ tif->tif_rawdatasize = 0;
+ }
+ tif->tif_flags &= ~TIFF_MYBUFFER;
+ /*
+ * We must check for overflow, potentially causing
+ * an OOB read. Instead of simple
+ *
+ * td->td_stripoffset[tile]+bytecount > tif->tif_size
+ *
+ * comparison (which can overflow) we do the following
+ * two comparisons:
+ */
+ if (bytecount > (uint64)tif->tif_size ||
+ td->td_stripoffset[tile] > (uint64)tif->tif_size - bytecount) {
+ tif->tif_curtile = NOTILE;
+ return (0);
+ }
+ tif->tif_rawdatasize = (tmsize_t)bytecount;
+ tif->tif_rawdata =
+ tif->tif_base + (tmsize_t)td->td_stripoffset[tile];
+ tif->tif_rawdataoff = 0;
+ tif->tif_rawdataloaded = (tmsize_t) bytecount;
+ tif->tif_flags |= TIFF_BUFFERMMAP;
+ } else {
+ /*
+ * Expand raw data buffer, if needed, to hold data
+ * tile coming from file (perhaps should set upper
+ * bound on the size of a buffer we'll use?).
+ */
+ tmsize_t bytecountm;
+ bytecountm=(tmsize_t)bytecount;
+ if ((uint64)bytecountm!=bytecount)
+ {
+ TIFFErrorExt(tif->tif_clientdata,module,"Integer overflow");
+ return(0);
+ }
+ if (bytecountm > tif->tif_rawdatasize) {
+ tif->tif_curtile = NOTILE;
+ if ((tif->tif_flags & TIFF_MYBUFFER) == 0) {
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "Data buffer too small to hold tile %lu",
+ (unsigned long) tile);
+ return (0);
+ }
+ if (!TIFFReadBufferSetup(tif, 0, bytecountm))
+ return (0);
+ }
+ if (tif->tif_flags&TIFF_BUFFERMMAP) {
+ tif->tif_curtile = NOTILE;
+ if (!TIFFReadBufferSetup(tif, 0, bytecountm))
+ return (0);
+ }
+
+ if (TIFFReadRawTile1(tif, tile, tif->tif_rawdata,
+ bytecountm, module) != bytecountm)
+ return (0);
+
+ tif->tif_rawdataoff = 0;
+ tif->tif_rawdataloaded = bytecountm;
+
+ if (!isFillOrder(tif, td->td_fillorder) &&
+ (tif->tif_flags & TIFF_NOBITREV) == 0)
+ TIFFReverseBits(tif->tif_rawdata,
+ tif->tif_rawdataloaded);
+ }
+ }
+ return (TIFFStartTile(tif, tile));
+}
+
+/*
+ * Setup the raw data buffer in preparation for
+ * reading a strip of raw data. If the buffer
+ * is specified as zero, then a buffer of appropriate
+ * size is allocated by the library. Otherwise,
+ * the client must guarantee that the buffer is
+ * large enough to hold any individual strip of
+ * raw data.
+ */
+int
+TIFFReadBufferSetup(TIFF* tif, void* bp, tmsize_t size)
+{
+ static const char module[] = "TIFFReadBufferSetup";
+
+ assert((tif->tif_flags&TIFF_NOREADRAW)==0);
+ tif->tif_flags &= ~TIFF_BUFFERMMAP;
+
+ if (tif->tif_rawdata) {
+ if (tif->tif_flags & TIFF_MYBUFFER)
+ _TIFFfree(tif->tif_rawdata);
+ tif->tif_rawdata = NULL;
+ tif->tif_rawdatasize = 0;
+ }
+ if (bp) {
+ tif->tif_rawdatasize = size;
+ tif->tif_rawdata = (uint8*) bp;
+ tif->tif_flags &= ~TIFF_MYBUFFER;
+ } else {
+ tif->tif_rawdatasize = (tmsize_t)TIFFroundup_64((uint64)size, 1024);
+ if (tif->tif_rawdatasize==0) {
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "Invalid buffer size");
+ return (0);
+ }
+ tif->tif_rawdata = (uint8*) _TIFFmalloc(tif->tif_rawdatasize);
+ tif->tif_flags |= TIFF_MYBUFFER;
+ }
+ if (tif->tif_rawdata == NULL) {
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "No space for data buffer at scanline %lu",
+ (unsigned long) tif->tif_row);
+ tif->tif_rawdatasize = 0;
+ return (0);
+ }
+ return (1);
+}
+
+/*
+ * Set state to appear as if a
+ * strip has just been read in.
+ */
+static int
+TIFFStartStrip(TIFF* tif, uint32 strip)
+{
+ TIFFDirectory *td = &tif->tif_dir;
+
+ if (!_TIFFFillStriles( tif ) || !tif->tif_dir.td_stripbytecount)
+ return 0;
+
+ if ((tif->tif_flags & TIFF_CODERSETUP) == 0) {
+ if (!(*tif->tif_setupdecode)(tif))
+ return (0);
+ tif->tif_flags |= TIFF_CODERSETUP;
+ }
+ tif->tif_curstrip = strip;
+ tif->tif_row = (strip % td->td_stripsperimage) * td->td_rowsperstrip;
+ tif->tif_flags &= ~TIFF_BUF4WRITE;
+
+ if (tif->tif_flags&TIFF_NOREADRAW)
+ {
+ tif->tif_rawcp = NULL;
+ tif->tif_rawcc = 0;
+ }
+ else
+ {
+ tif->tif_rawcp = tif->tif_rawdata;
+ tif->tif_rawcc = (tmsize_t)td->td_stripbytecount[strip];
+ }
+ return ((*tif->tif_predecode)(tif,
+ (uint16)(strip / td->td_stripsperimage)));
+}
+
+/*
+ * Set state to appear as if a
+ * tile has just been read in.
+ */
+static int
+TIFFStartTile(TIFF* tif, uint32 tile)
+{
+ TIFFDirectory *td = &tif->tif_dir;
+
+ if (!_TIFFFillStriles( tif ) || !tif->tif_dir.td_stripbytecount)
+ return 0;
+
+ if ((tif->tif_flags & TIFF_CODERSETUP) == 0) {
+ if (!(*tif->tif_setupdecode)(tif))
+ return (0);
+ tif->tif_flags |= TIFF_CODERSETUP;
+ }
+ tif->tif_curtile = tile;
+ tif->tif_row =
+ (tile % TIFFhowmany_32(td->td_imagewidth, td->td_tilewidth)) *
+ td->td_tilelength;
+ tif->tif_col =
+ (tile % TIFFhowmany_32(td->td_imagelength, td->td_tilelength)) *
+ td->td_tilewidth;
+ tif->tif_flags &= ~TIFF_BUF4WRITE;
+ if (tif->tif_flags&TIFF_NOREADRAW)
+ {
+ tif->tif_rawcp = NULL;
+ tif->tif_rawcc = 0;
+ }
+ else
+ {
+ tif->tif_rawcp = tif->tif_rawdata;
+ tif->tif_rawcc = (tmsize_t)td->td_stripbytecount[tile];
+ }
+ return ((*tif->tif_predecode)(tif,
+ (uint16)(tile/td->td_stripsperimage)));
+}
+
+static int
+TIFFCheckRead(TIFF* tif, int tiles)
+{
+ if (tif->tif_mode == O_WRONLY) {
+ TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "File not open for reading");
+ return (0);
+ }
+ if (tiles ^ isTiled(tif)) {
+ TIFFErrorExt(tif->tif_clientdata, tif->tif_name, tiles ?
+ "Can not read tiles from a stripped image" :
+ "Can not read scanlines from a tiled image");
+ return (0);
+ }
+ return (1);
+}
+
+void
+_TIFFNoPostDecode(TIFF* tif, uint8* buf, tmsize_t cc)
+{
+ (void) tif; (void) buf; (void) cc;
+}
+
+void
+_TIFFSwab16BitData(TIFF* tif, uint8* buf, tmsize_t cc)
+{
+ (void) tif;
+ assert((cc & 1) == 0);
+ TIFFSwabArrayOfShort((uint16*) buf, cc/2);
+}
+
+void
+_TIFFSwab24BitData(TIFF* tif, uint8* buf, tmsize_t cc)
+{
+ (void) tif;
+ assert((cc % 3) == 0);
+ TIFFSwabArrayOfTriples((uint8*) buf, cc/3);
+}
+
+void
+_TIFFSwab32BitData(TIFF* tif, uint8* buf, tmsize_t cc)
+{
+ (void) tif;
+ assert((cc & 3) == 0);
+ TIFFSwabArrayOfLong((uint32*) buf, cc/4);
+}
+
+void
+_TIFFSwab64BitData(TIFF* tif, uint8* buf, tmsize_t cc)
+{
+ (void) tif;
+ assert((cc & 7) == 0);
+ TIFFSwabArrayOfDouble((double*) buf, cc/8);
+}
+
+/* vim: set ts=8 sts=8 sw=8 noet: */
+/*
+ * Local Variables:
+ * mode: c
+ * c-basic-offset: 8
+ * fill-column: 78
+ * End:
+ */