/* $Id: tif_read.c,v 1.41 2012-07-06 19:22:58 bfriesen 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;
uint64 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 = 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 (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 (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 (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)
tif->tif_rawdatasize=(tmsize_t)(-1);
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:
*/