tif_read.c File Reference

#include "tiffiop.h"
#include <stdio.h>

Include dependency graph for tif_read.c:

Go to the source code of this file.

Macros
#define	NOSTRIP   ((uint32_t)(-1)) /* undefined state */
#define	NOTILE   ((uint32_t)(-1)) /* undefined state */
#define	INITIAL_THRESHOLD   (1024 * 1024)
#define	THRESHOLD_MULTIPLIER   10
#define	MAX_THRESHOLD
#define	TIFF_INT64_MAX   ((((int64_t)0x7FFFFFFF) << 32) | 0xFFFFFFFF)

Functions
int	TIFFFillStrip (TIFF *tif, uint32_t strip)
int	TIFFFillTile (TIFF *tif, uint32_t tile)
static int	TIFFStartStrip (TIFF *tif, uint32_t strip)
static int	TIFFStartTile (TIFF *tif, uint32_t tile)
static int	TIFFCheckRead (TIFF *, int)
static tmsize_t	TIFFReadRawStrip1 (TIFF *tif, uint32_t strip, void *buf, tmsize_t size, const char *module)
static tmsize_t	TIFFReadRawTile1 (TIFF *tif, uint32_t tile, void *buf, tmsize_t size, const char *module)
static int	TIFFReadAndRealloc (TIFF *tif, tmsize_t size, tmsize_t rawdata_offset, int is_strip, uint32_t strip_or_tile, const char *module)
static int	TIFFFillStripPartial (TIFF *tif, int strip, tmsize_t read_ahead, int restart)
static int	TIFFSeek (TIFF *tif, uint32_t row, uint16_t sample)
int	TIFFReadScanline (TIFF *tif, void *buf, uint32_t row, uint16_t sample)
static tmsize_t	TIFFReadEncodedStripGetStripSize (TIFF *tif, uint32_t strip, uint16_t *pplane)
tmsize_t	TIFFReadEncodedStrip (TIFF *tif, uint32_t strip, void *buf, tmsize_t size)
tmsize_t	_TIFFReadEncodedStripAndAllocBuffer (TIFF *tif, uint32_t strip, void **buf, tmsize_t bufsizetoalloc, tmsize_t size_to_read)
static tmsize_t	TIFFReadRawStripOrTile2 (TIFF *tif, uint32_t strip_or_tile, int is_strip, tmsize_t size, const char *module)
tmsize_t	TIFFReadRawStrip (TIFF *tif, uint32_t strip, void *buf, tmsize_t size)
static TIFF_NOSANITIZE_UNSIGNED_INT_OVERFLOW uint64_t	NoSanitizeSubUInt64 (uint64_t a, uint64_t b)
tmsize_t	TIFFReadTile (TIFF *tif, void *buf, uint32_t x, uint32_t y, uint32_t z, uint16_t s)
tmsize_t	TIFFReadEncodedTile (TIFF *tif, uint32_t tile, void *buf, tmsize_t size)
tmsize_t	_TIFFReadTileAndAllocBuffer (TIFF *tif, void **buf, tmsize_t bufsizetoalloc, uint32_t x, uint32_t y, uint32_t z, uint16_t s)
tmsize_t	_TIFFReadEncodedTileAndAllocBuffer (TIFF *tif, uint32_t tile, void **buf, tmsize_t bufsizetoalloc, tmsize_t size_to_read)
tmsize_t	TIFFReadRawTile (TIFF *tif, uint32_t tile, void *buf, tmsize_t size)
int	TIFFReadBufferSetup (TIFF *tif, void *bp, tmsize_t size)
int	TIFFReadFromUserBuffer (TIFF *tif, uint32_t strile, void *inbuf, tmsize_t insize, void *outbuf, tmsize_t outsize)
void	_TIFFNoPostDecode (TIFF *tif, uint8_t *buf, tmsize_t cc)
void	_TIFFSwab16BitData (TIFF *tif, uint8_t *buf, tmsize_t cc)
void	_TIFFSwab24BitData (TIFF *tif, uint8_t *buf, tmsize_t cc)
void	_TIFFSwab32BitData (TIFF *tif, uint8_t *buf, tmsize_t cc)
void	_TIFFSwab64BitData (TIFF *tif, uint8_t *buf, tmsize_t cc)

Macro Definition Documentation

INITIAL_THRESHOLD

#define INITIAL_THRESHOLD   (1024 * 1024)

Definition at line 45 of file tif_read.c.

MAX_THRESHOLD

#define MAX_THRESHOLD

Value:

    (THRESHOLD_MULTIPLIER * THRESHOLD_MULTIPLIER * THRESHOLD_MULTIPLIER *      \
     INITIAL_THRESHOLD)

Definition at line 47 of file tif_read.c.

NOSTRIP

#define NOSTRIP   ((uint32_t)(-1)) /* undefined state */

Definition at line 42 of file tif_read.c.

NOTILE

#define NOTILE   ((uint32_t)(-1)) /* undefined state */

Definition at line 43 of file tif_read.c.

THRESHOLD_MULTIPLIER

#define THRESHOLD_MULTIPLIER   10

Definition at line 46 of file tif_read.c.

TIFF_INT64_MAX

#define TIFF_INT64_MAX   ((((int64_t)0x7FFFFFFF) << 32) | 0xFFFFFFFF)

Definition at line 51 of file tif_read.c.

Function Documentation

_TIFFNoPostDecode()

void _TIFFNoPostDecode	(	TIFF *	tif,
		uint8_t *	buf,
		tmsize_t	cc
	)

Definition at line 1648 of file tif_read.c.

{
    (void)tif;
    (void)buf;
    (void)cc;
}

Referenced by _TIFFVSetField(), PredictorSetupDecode(), PredictorSetupEncode(), and TIFFDefaultDirectory().

_TIFFReadEncodedStripAndAllocBuffer()

tmsize_t _TIFFReadEncodedStripAndAllocBuffer	(	TIFF *	tif,
		uint32_t	strip,
		void **	buf,
		tmsize_t	bufsizetoalloc,
		tmsize_t	size_to_read
	)

Definition at line 584 of file tif_read.c.

{
    tmsize_t this_stripsize;
    uint16_t plane;
 
    if (*buf != NULL)
    {
        return TIFFReadEncodedStrip(tif, strip, *buf, size_to_read);
    }
 
    this_stripsize = TIFFReadEncodedStripGetStripSize(tif, strip, &plane);
    if (this_stripsize == ((tmsize_t)(-1)))
        return ((tmsize_t)(-1));
 
    if ((size_to_read != (tmsize_t)(-1)) && (size_to_read < this_stripsize))
        this_stripsize = size_to_read;
    if (!TIFFFillStrip(tif, strip))
        return ((tmsize_t)(-1));
 
    *buf = _TIFFmallocExt(tif, bufsizetoalloc);
    if (*buf == NULL)
    {
        TIFFErrorExtR(tif, TIFFFileName(tif), "No space for strip buffer");
        return ((tmsize_t)(-1));
    }
    _TIFFmemset(*buf, 0, bufsizetoalloc);
 
    if ((*tif->tif_decodestrip)(tif, *buf, this_stripsize, plane) <= 0)
        return ((tmsize_t)(-1));
    (*tif->tif_postdecode)(tif, *buf, this_stripsize);
    return (this_stripsize);
}

Referenced by gtStripContig(), and gtStripSeparate().

_TIFFReadEncodedTileAndAllocBuffer()

tmsize_t _TIFFReadEncodedTileAndAllocBuffer	(	TIFF *	tif,
		uint32_t	tile,
		void **	buf,
		tmsize_t	bufsizetoalloc,
		tmsize_t	size_to_read
	)

Definition at line 1029 of file tif_read.c.

{
    static const char module[] = "_TIFFReadEncodedTileAndAllocBuffer";
    TIFFDirectory *td = &tif->tif_dir;
    tmsize_t tilesize = tif->tif_tilesize;
 
    if (*buf != NULL)
    {
        return TIFFReadEncodedTile(tif, tile, *buf, size_to_read);
    }
 
    if (!TIFFCheckRead(tif, 1))
        return ((tmsize_t)(-1));
    if (tile >= td->td_nstrips)
    {
        TIFFErrorExtR(tif, module,
                      "%" PRIu32 ": Tile out of range, max %" PRIu32, tile,
                      td->td_nstrips);
        return ((tmsize_t)(-1));
    }
 
    if (!TIFFFillTile(tif, tile))
        return ((tmsize_t)(-1));
 
    /* Sanity checks to avoid excessive memory allocation */
    /* Cf https://gitlab.com/libtiff/libtiff/-/issues/479 */
    if (td->td_compression == COMPRESSION_NONE)
    {
        if (tif->tif_rawdatasize != tilesize)
        {
            TIFFErrorExtR(tif, TIFFFileName(tif),
                          "Invalid tile byte count for tile %u. "
                          "Expected %" PRIu64 ", got %" PRIu64,
                          tile, (uint64_t)tilesize,
                          (uint64_t)tif->tif_rawdatasize);
            return ((tmsize_t)(-1));
        }
    }
    else
    {
        /* Max compression ratio experimentally determined. Might be fragile...
         * Only apply this heuristics to situations where the memory allocation
         * would be big, to avoid breaking nominal use cases.
         */
        const int maxCompressionRatio =
            td->td_compression == COMPRESSION_ZSTD ? 33000
            : td->td_compression == COMPRESSION_JXL
                ?
                /* Evaluated on a 8000x8000 tile */
                25000 * (td->td_planarconfig == PLANARCONFIG_CONTIG
                             ? td->td_samplesperpixel
                             : 1)
                : td->td_compression == COMPRESSION_LZMA ? 7000 : 1000;
        if (bufsizetoalloc > 100 * 1000 * 1000 &&
            tif->tif_rawdatasize < tilesize / maxCompressionRatio)
        {
            TIFFErrorExtR(tif, TIFFFileName(tif),
                          "Likely invalid tile byte count for tile %u. "
                          "Uncompressed tile size is %" PRIu64 ", "
                          "compressed one is %" PRIu64,
                          tile, (uint64_t)tilesize,
                          (uint64_t)tif->tif_rawdatasize);
            return ((tmsize_t)(-1));
        }
    }
 
    *buf = _TIFFmallocExt(tif, bufsizetoalloc);
    if (*buf == NULL)
    {
        TIFFErrorExtR(tif, TIFFFileName(tif), "No space for tile buffer");
        return ((tmsize_t)(-1));
    }
    _TIFFmemset(*buf, 0, bufsizetoalloc);
 
    if (size_to_read == (tmsize_t)(-1))
        size_to_read = tilesize;
    else if (size_to_read > tilesize)
        size_to_read = tilesize;
    if ((*tif->tif_decodetile)(tif, (uint8_t *)*buf, size_to_read,
                               (uint16_t)(tile / td->td_stripsperimage)))
    {
        (*tif->tif_postdecode)(tif, (uint8_t *)*buf, size_to_read);
        return (size_to_read);
    }
    else
        return ((tmsize_t)(-1));
}

Referenced by _TIFFReadTileAndAllocBuffer().

_TIFFReadTileAndAllocBuffer()

tmsize_t _TIFFReadTileAndAllocBuffer	(	TIFF *	tif,
		void **	buf,
		tmsize_t	bufsizetoalloc,
		uint32_t	x,
		uint32_t	y,
		uint32_t	z,
		uint16_t	s
	)

Definition at line 1012 of file tif_read.c.

{
    if (!TIFFCheckRead(tif, 1) || !TIFFCheckTile(tif, x, y, z, s))
        return ((tmsize_t)(-1));
    return (_TIFFReadEncodedTileAndAllocBuffer(
        tif, TIFFComputeTile(tif, x, y, z, s), buf, bufsizetoalloc,
        (tmsize_t)(-1)));
}

Referenced by gtTileContig(), and gtTileSeparate().

_TIFFSwab16BitData()

void _TIFFSwab16BitData	(	TIFF *	tif,
		uint8_t *	buf,
		tmsize_t	cc
	)

Definition at line 1655 of file tif_read.c.

{
    (void)tif;
    assert((cc & 1) == 0);
    TIFFSwabArrayOfShort((uint16_t *)buf, cc / 2);
}

Referenced by _TIFFVSetField().

_TIFFSwab24BitData()

void _TIFFSwab24BitData	(	TIFF *	tif,
		uint8_t *	buf,
		tmsize_t	cc
	)

Definition at line 1662 of file tif_read.c.

{
    (void)tif;
    assert((cc % 3) == 0);
    TIFFSwabArrayOfTriples((uint8_t *)buf, cc / 3);
}

Referenced by _TIFFVSetField().

_TIFFSwab32BitData()

void _TIFFSwab32BitData	(	TIFF *	tif,
		uint8_t *	buf,
		tmsize_t	cc
	)

Definition at line 1669 of file tif_read.c.

{
    (void)tif;
    assert((cc & 3) == 0);
    TIFFSwabArrayOfLong((uint32_t *)buf, cc / 4);
}

Referenced by _TIFFVSetField().

_TIFFSwab64BitData()

void _TIFFSwab64BitData	(	TIFF *	tif,
		uint8_t *	buf,
		tmsize_t	cc
	)

Definition at line 1676 of file tif_read.c.

{
    (void)tif;
    assert((cc & 7) == 0);
    TIFFSwabArrayOfDouble((double *)buf, cc / 8);
}

Referenced by _TIFFVSetField().

NoSanitizeSubUInt64()

static TIFF_NOSANITIZE_UNSIGNED_INT_OVERFLOW uint64_t NoSanitizeSubUInt64 ( uint64_t  a, uint64_t  b  )

static

Definition at line 753 of file tif_read.c.

{ return a - b; }

Referenced by TIFFFillStrip().

TIFFCheckRead()

static int TIFFCheckRead ( TIFF *  tif, int  tiles  )

static

Definition at line 1519 of file tif_read.c.

{
    if (tif->tif_mode == O_WRONLY)
    {
        TIFFErrorExtR(tif, tif->tif_name, "File not open for reading");
        return (0);
    }
    if (tiles ^ isTiled(tif))
    {
        TIFFErrorExtR(tif, tif->tif_name,
                      tiles ? "Can not read tiles from a striped image"
                            : "Can not read scanlines from a tiled image");
        return (0);
    }
    return (1);
}

Referenced by _TIFFReadEncodedTileAndAllocBuffer(), _TIFFReadTileAndAllocBuffer(), TIFFReadEncodedStripGetStripSize(), TIFFReadEncodedTile(), TIFFReadRawStrip(), TIFFReadRawTile(), TIFFReadScanline(), and TIFFReadTile().

TIFFFillStrip()

int TIFFFillStrip	(	TIFF *	tif,
		uint32_t	strip
	)

Definition at line 759 of file tif_read.c.

{
    static const char module[] = "TIFFFillStrip";
    TIFFDirectory *td = &tif->tif_dir;
 
    if ((tif->tif_flags & TIFF_NOREADRAW) == 0)
    {
        uint64_t bytecount = TIFFGetStrileByteCount(tif, strip);
        if (bytecount == 0 || bytecount > (uint64_t)TIFF_INT64_MAX)
        {
            TIFFErrorExtR(tif, module,
                          "Invalid strip byte count %" PRIu64
                          ", strip %" PRIu32,
                          bytecount, strip);
            return (0);
        }
 
        /* To avoid excessive memory allocations: */
        /* Byte count should normally not be larger than a number of */
        /* times the uncompressed size plus some margin */
        if (bytecount > 1024 * 1024)
        {
            /* 10 and 4096 are just values that could be adjusted. */
            /* Hopefully they are safe enough for all codecs */
            tmsize_t stripsize = TIFFStripSize(tif);
            if (stripsize != 0 && (bytecount - 4096) / 10 > (uint64_t)stripsize)
            {
                uint64_t newbytecount = (uint64_t)stripsize * 10 + 4096;
                TIFFErrorExtR(tif, module,
                              "Too large strip byte count %" PRIu64
                              ", strip %" PRIu32 ". Limiting to %" PRIu64,
                              bytecount, strip, newbytecount);
                bytecount = newbytecount;
            }
        }
 
        if (isMapped(tif))
        {
            /*
             * We must check for overflow, potentially causing
             * an OOB read. Instead of simple
             *
             *  TIFFGetStrileOffset(tif, strip)+bytecount > tif->tif_size
             *
             * comparison (which can overflow) we do the following
             * two comparisons:
             */
            if (bytecount > (uint64_t)tif->tif_size ||
                TIFFGetStrileOffset(tif, strip) >
                    (uint64_t)tif->tif_size - bytecount)
            {
                /*
                 * This error message might seem strange, but
                 * it's what would happen if a read were done
                 * instead.
                 */
                TIFFErrorExtR(
                    tif, module,
 
                    "Read error on strip %" PRIu32 "; "
                    "got %" PRIu64 " bytes, expected %" PRIu64,
                    strip,
                    NoSanitizeSubUInt64(tif->tif_size,
                                        TIFFGetStrileOffset(tif, strip)),
                    bytecount);
                tif->tif_curstrip = NOSTRIP;
                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)
            {
                _TIFFfreeExt(tif, tif->tif_rawdata);
                tif->tif_rawdata = NULL;
                tif->tif_rawdatasize = 0;
            }
            tif->tif_flags &= ~TIFF_MYBUFFER;
            tif->tif_rawdatasize = (tmsize_t)bytecount;
            tif->tif_rawdata =
                tif->tif_base + (tmsize_t)TIFFGetStrileOffset(tif, 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_t)bytecountm != bytecount)
            {
                TIFFErrorExtR(tif, module, "Integer overflow");
                return (0);
            }
            if (bytecountm > tif->tif_rawdatasize)
            {
                tif->tif_curstrip = NOSTRIP;
                if ((tif->tif_flags & TIFF_MYBUFFER) == 0)
                {
                    TIFFErrorExtR(
                        tif, module,
                        "Data buffer too small to hold strip %" PRIu32, strip);
                    return (0);
                }
            }
            if (tif->tif_flags & TIFF_BUFFERMMAP)
            {
                tif->tif_curstrip = NOSTRIP;
                tif->tif_rawdata = NULL;
                tif->tif_rawdatasize = 0;
                tif->tif_flags &= ~TIFF_BUFFERMMAP;
            }
 
            if (isMapped(tif))
            {
                if (bytecountm > tif->tif_rawdatasize &&
                    !TIFFReadBufferSetup(tif, 0, bytecountm))
                {
                    return (0);
                }
                if (TIFFReadRawStrip1(tif, strip, tif->tif_rawdata, bytecountm,
                                      module) != bytecountm)
                {
                    return (0);
                }
            }
            else
            {
                if (TIFFReadRawStripOrTile2(tif, strip, 1, 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));
}

Referenced by _TIFFReadEncodedStripAndAllocBuffer(), TIFFFillStripPartial(), TIFFReadEncodedStrip(), and TIFFSeek().

TIFFFillStripPartial()

static int TIFFFillStripPartial ( TIFF *  tif, int  strip, tmsize_t  read_ahead, int  restart  )

static

Definition at line 159 of file tif_read.c.

{
    static const char module[] = "TIFFFillStripPartial";
    register TIFFDirectory *td = &tif->tif_dir;
    tmsize_t unused_data;
    uint64_t read_offset;
    tmsize_t to_read;
    tmsize_t read_ahead_mod;
    /* tmsize_t bytecountm; */
 
    /*
     * 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) TIFFGetStrileByteCount(tif, strip); */
 
    /* Not completely sure where the * 2 comes from, but probably for */
    /* an exponentional growth strategy of tif_rawdatasize */
    if (read_ahead < TIFF_TMSIZE_T_MAX / 2)
        read_ahead_mod = read_ahead * 2;
    else
        read_ahead_mod = read_ahead;
    if (read_ahead_mod > tif->tif_rawdatasize)
    {
        assert(restart);
 
        tif->tif_curstrip = NOSTRIP;
        if ((tif->tif_flags & TIFF_MYBUFFER) == 0)
        {
            TIFFErrorExtR(tif, module,
                          "Data buffer too small to hold part of strip %d",
                          strip);
            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 = TIFFGetStrileOffset(tif, strip) + tif->tif_rawdataoff +
                  tif->tif_rawdataloaded;
 
    if (!SeekOK(tif, read_offset))
    {
        TIFFErrorExtR(tif, module,
                      "Seek error at scanline %" PRIu32 ", strip %d",
                      tif->tif_row, strip);
        return 0;
    }
 
    /*
    ** How much do we want to read?
    */
    if (read_ahead_mod > tif->tif_rawdatasize)
        to_read = read_ahead_mod - unused_data;
    else
        to_read = tif->tif_rawdatasize - unused_data;
    if ((uint64_t)to_read > TIFFGetStrileByteCount(tif, strip) -
                                tif->tif_rawdataoff - tif->tif_rawdataloaded)
    {
        to_read = (tmsize_t)TIFFGetStrileByteCount(tif, strip) -
                  tif->tif_rawdataoff - tif->tif_rawdataloaded;
    }
 
    assert((tif->tif_flags & TIFF_BUFFERMMAP) == 0);
    if (!TIFFReadAndRealloc(tif, to_read, unused_data, 1, /* is_strip */
                            0,                            /* strip_or_tile */
                            module))
    {
        return 0;
    }
 
    tif->tif_rawdataoff =
        tif->tif_rawdataoff + tif->tif_rawdataloaded - unused_data;
    tif->tif_rawdataloaded = unused_data + to_read;
 
    tif->tif_rawcc = tif->tif_rawdataloaded;
    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)
    {
 
#ifdef JPEG_SUPPORT
        /* A bit messy since breaks the codec abstraction. Ultimately */
        /* there should be a function pointer for that, but it seems */
        /* only JPEG is affected. */
        /* For JPEG, if there are multiple scans (can generally be known */
        /* with the  read_ahead used), we need to read the whole strip */
        if (tif->tif_dir.td_compression == COMPRESSION_JPEG &&
            (uint64_t)tif->tif_rawcc < TIFFGetStrileByteCount(tif, strip))
        {
            if (TIFFJPEGIsFullStripRequired(tif))
            {
                return TIFFFillStrip(tif, strip);
            }
        }
#endif
 
        return TIFFStartStrip(tif, strip);
    }
    else
    {
        return 1;
    }
}

Referenced by TIFFSeek().

TIFFFillTile()

int TIFFFillTile	(	TIFF *	tif,
		uint32_t	tile
	)

Definition at line 1215 of file tif_read.c.

{
    static const char module[] = "TIFFFillTile";
    TIFFDirectory *td = &tif->tif_dir;
 
    if ((tif->tif_flags & TIFF_NOREADRAW) == 0)
    {
        uint64_t bytecount = TIFFGetStrileByteCount(tif, tile);
        if (bytecount == 0 || bytecount > (uint64_t)TIFF_INT64_MAX)
        {
            TIFFErrorExtR(tif, module,
                          "%" PRIu64 ": Invalid tile byte count, tile %" PRIu32,
                          bytecount, tile);
            return (0);
        }
 
        /* To avoid excessive memory allocations: */
        /* Byte count should normally not be larger than a number of */
        /* times the uncompressed size plus some margin */
        if (bytecount > 1024 * 1024)
        {
            /* 10 and 4096 are just values that could be adjusted. */
            /* Hopefully they are safe enough for all codecs */
            tmsize_t stripsize = TIFFTileSize(tif);
            if (stripsize != 0 && (bytecount - 4096) / 10 > (uint64_t)stripsize)
            {
                uint64_t newbytecount = (uint64_t)stripsize * 10 + 4096;
                TIFFErrorExtR(tif, module,
                              "Too large tile byte count %" PRIu64
                              ", tile %" PRIu32 ". Limiting to %" PRIu64,
                              bytecount, tile, newbytecount);
                bytecount = newbytecount;
            }
        }
 
        if (isMapped(tif))
        {
            /*
             * We must check for overflow, potentially causing
             * an OOB read. Instead of simple
             *
             *  TIFFGetStrileOffset(tif, tile)+bytecount > tif->tif_size
             *
             * comparison (which can overflow) we do the following
             * two comparisons:
             */
            if (bytecount > (uint64_t)tif->tif_size ||
                TIFFGetStrileOffset(tif, tile) >
                    (uint64_t)tif->tif_size - bytecount)
            {
                tif->tif_curtile = NOTILE;
                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)
            {
                _TIFFfreeExt(tif, tif->tif_rawdata);
                tif->tif_rawdata = NULL;
                tif->tif_rawdatasize = 0;
            }
            tif->tif_flags &= ~TIFF_MYBUFFER;
 
            tif->tif_rawdatasize = (tmsize_t)bytecount;
            tif->tif_rawdata =
                tif->tif_base + (tmsize_t)TIFFGetStrileOffset(tif, 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_t)bytecountm != bytecount)
            {
                TIFFErrorExtR(tif, module, "Integer overflow");
                return (0);
            }
            if (bytecountm > tif->tif_rawdatasize)
            {
                tif->tif_curtile = NOTILE;
                if ((tif->tif_flags & TIFF_MYBUFFER) == 0)
                {
                    TIFFErrorExtR(tif, module,
                                  "Data buffer too small to hold tile %" PRIu32,
                                  tile);
                    return (0);
                }
            }
            if (tif->tif_flags & TIFF_BUFFERMMAP)
            {
                tif->tif_curtile = NOTILE;
                tif->tif_rawdata = NULL;
                tif->tif_rawdatasize = 0;
                tif->tif_flags &= ~TIFF_BUFFERMMAP;
            }
 
            if (isMapped(tif))
            {
                if (bytecountm > tif->tif_rawdatasize &&
                    !TIFFReadBufferSetup(tif, 0, bytecountm))
                {
                    return (0);
                }
                if (TIFFReadRawTile1(tif, tile, tif->tif_rawdata, bytecountm,
                                     module) != bytecountm)
                {
                    return (0);
                }
            }
            else
            {
                if (TIFFReadRawStripOrTile2(tif, tile, 0, bytecountm, module) !=
                    bytecountm)
                {
                    return (0);
                }
            }
 
            tif->tif_rawdataoff = 0;
            tif->tif_rawdataloaded = bytecountm;
 
            if (tif->tif_rawdata != NULL &&
                !isFillOrder(tif, td->td_fillorder) &&
                (tif->tif_flags & TIFF_NOBITREV) == 0)
                TIFFReverseBits(tif->tif_rawdata, tif->tif_rawdataloaded);
        }
    }
    return (TIFFStartTile(tif, tile));
}

Referenced by _TIFFReadEncodedTileAndAllocBuffer(), and TIFFReadEncodedTile().

TIFFReadAndRealloc()

static int TIFFReadAndRealloc ( TIFF *  tif, tmsize_t  size, tmsize_t  rawdata_offset, int  is_strip, uint32_t  strip_or_tile, const char *  module  )

static

Definition at line 55 of file tif_read.c.

{
#if SIZEOF_SIZE_T == 8
    tmsize_t threshold = INITIAL_THRESHOLD;
#endif
    tmsize_t already_read = 0;
 
#if SIZEOF_SIZE_T != 8
    /* On 32 bit processes, if the request is large enough, check against */
    /* file size */
    if (size > 1000 * 1000 * 1000)
    {
        uint64_t filesize = TIFFGetFileSize(tif);
        if ((uint64_t)size >= filesize)
        {
            TIFFErrorExtR(tif, module,
                          "Chunk size requested is larger than file size.");
            return 0;
        }
    }
#endif
 
    /* On 64 bit processes, read first a maximum of 1 MB, then 10 MB, etc */
    /* so as to avoid allocating too much memory in case the file is too */
    /* short. We could ask for the file size, but this might be */
    /* expensive with some I/O layers (think of reading a gzipped file) */
    /* Restrict to 64 bit processes, so as to avoid reallocs() */
    /* on 32 bit processes where virtual memory is scarce.  */
    while (already_read < size)
    {
        tmsize_t bytes_read;
        tmsize_t to_read = size - already_read;
#if SIZEOF_SIZE_T == 8
        if (to_read >= threshold && threshold < MAX_THRESHOLD &&
            already_read + to_read + rawdata_offset > tif->tif_rawdatasize)
        {
            to_read = threshold;
            threshold *= THRESHOLD_MULTIPLIER;
        }
#endif
        if (already_read + to_read + rawdata_offset > tif->tif_rawdatasize)
        {
            uint8_t *new_rawdata;
            assert((tif->tif_flags & TIFF_MYBUFFER) != 0);
            tif->tif_rawdatasize = (tmsize_t)TIFFroundup_64(
                (uint64_t)already_read + to_read + rawdata_offset, 1024);
            if (tif->tif_rawdatasize == 0)
            {
                TIFFErrorExtR(tif, module, "Invalid buffer size");
                return 0;
            }
            new_rawdata = (uint8_t *)_TIFFreallocExt(tif, tif->tif_rawdata,
                                                     tif->tif_rawdatasize);
            if (new_rawdata == 0)
            {
                TIFFErrorExtR(tif, module,
                              "No space for data buffer at scanline %" PRIu32,
                              tif->tif_row);
                _TIFFfreeExt(tif, tif->tif_rawdata);
                tif->tif_rawdata = 0;
                tif->tif_rawdatasize = 0;
                return 0;
            }
            tif->tif_rawdata = new_rawdata;
        }
        if (tif->tif_rawdata == NULL)
        {
            /* should not happen in practice but helps CoverityScan */
            return 0;
        }
 
        bytes_read = TIFFReadFile(
            tif, tif->tif_rawdata + rawdata_offset + already_read, to_read);
        already_read += bytes_read;
        if (bytes_read != to_read)
        {
            memset(tif->tif_rawdata + rawdata_offset + already_read, 0,
                   tif->tif_rawdatasize - rawdata_offset - already_read);
            if (is_strip)
            {
                TIFFErrorExtR(tif, module,
                              "Read error at scanline %" PRIu32
                              "; got %" TIFF_SSIZE_FORMAT " bytes, "
                              "expected %" TIFF_SSIZE_FORMAT,
                              tif->tif_row, already_read, size);
            }
            else
            {
                TIFFErrorExtR(tif, module,
                              "Read error at row %" PRIu32 ", col %" PRIu32
                              ", tile %" PRIu32 "; "
                              "got %" TIFF_SSIZE_FORMAT
                              " bytes, expected %" TIFF_SSIZE_FORMAT "",
                              tif->tif_row, tif->tif_col, strip_or_tile,
                              already_read, size);
            }
            return 0;
        }
    }
    return 1;
}

Referenced by TIFFFillStripPartial(), and TIFFReadRawStripOrTile2().

TIFFReadBufferSetup()

int TIFFReadBufferSetup	(	TIFF *	tif,
		void *	bp,
		tmsize_t	size
	)

Definition at line 1375 of file tif_read.c.

{
    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)
            _TIFFfreeExt(tif, tif->tif_rawdata);
        tif->tif_rawdata = NULL;
        tif->tif_rawdatasize = 0;
    }
    if (bp)
    {
        tif->tif_rawdatasize = size;
        tif->tif_rawdata = (uint8_t *)bp;
        tif->tif_flags &= ~TIFF_MYBUFFER;
    }
    else
    {
        tif->tif_rawdatasize = (tmsize_t)TIFFroundup_64((uint64_t)size, 1024);
        if (tif->tif_rawdatasize == 0)
        {
            TIFFErrorExtR(tif, module, "Invalid buffer size");
            return (0);
        }
        /* Initialize to zero to avoid uninitialized buffers in case of */
        /* short reads (http://bugzilla.maptools.org/show_bug.cgi?id=2651) */
        tif->tif_rawdata =
            (uint8_t *)_TIFFcallocExt(tif, 1, tif->tif_rawdatasize);
        tif->tif_flags |= TIFF_MYBUFFER;
    }
    if (tif->tif_rawdata == NULL)
    {
        TIFFErrorExtR(tif, module,
                      "No space for data buffer at scanline %" PRIu32,
                      tif->tif_row);
        tif->tif_rawdatasize = 0;
        return (0);
    }
    return (1);
}

Referenced by TIFFFillStrip(), and TIFFFillTile().

TIFFReadEncodedStrip()

tmsize_t TIFFReadEncodedStrip	(	TIFF *	tif,
		uint32_t	strip,
		void *	buf,
		tmsize_t	size
	)

Definition at line 534 of file tif_read.c.

{
    static const char module[] = "TIFFReadEncodedStrip";
    TIFFDirectory *td = &tif->tif_dir;
    tmsize_t stripsize;
    uint16_t plane;
 
    stripsize = TIFFReadEncodedStripGetStripSize(tif, strip, &plane);
    if (stripsize == ((tmsize_t)(-1)))
        return ((tmsize_t)(-1));
 
    /* shortcut to avoid an extra memcpy() */
    if (td->td_compression == COMPRESSION_NONE && size != (tmsize_t)(-1) &&
        size >= stripsize && !isMapped(tif) &&
        ((tif->tif_flags & TIFF_NOREADRAW) == 0))
    {
        if (TIFFReadRawStrip1(tif, strip, buf, stripsize, module) != stripsize)
            return ((tmsize_t)(-1));
 
        if (!isFillOrder(tif, td->td_fillorder) &&
            (tif->tif_flags & TIFF_NOBITREV) == 0)
            TIFFReverseBits(buf, stripsize);
 
        (*tif->tif_postdecode)(tif, buf, stripsize);
        return (stripsize);
    }
 
    if ((size != (tmsize_t)(-1)) && (size < stripsize))
        stripsize = size;
    if (!TIFFFillStrip(tif, strip))
    {
        /* The output buf may be NULL, in particular if TIFFTAG_FAXFILLFUNC
           is being used. Thus, memset must be conditional on buf not NULL. */
        if (buf)
            memset(buf, 0, (size_t)stripsize);
        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);
}

Referenced by _TIFFReadEncodedStripAndAllocBuffer(), gtStripSeparate(), and tiff_decoder_read_tile().

TIFFReadEncodedStripGetStripSize()

static tmsize_t TIFFReadEncodedStripGetStripSize ( TIFF *  tif, uint32_t  strip, uint16_t *  pplane  )

static

Definition at line 488 of file tif_read.c.

{
    static const char module[] = "TIFFReadEncodedStrip";
    TIFFDirectory *td = &tif->tif_dir;
    uint32_t rowsperstrip;
    uint32_t stripsperplane;
    uint32_t stripinplane;
    uint32_t rows;
    tmsize_t stripsize;
    if (!TIFFCheckRead(tif, 0))
        return ((tmsize_t)(-1));
    if (strip >= td->td_nstrips)
    {
        TIFFErrorExtR(tif, module,
                      "%" PRIu32 ": Strip out of range, max %" PRIu32, strip,
                      td->td_nstrips);
        return ((tmsize_t)(-1));
    }
 
    rowsperstrip = td->td_rowsperstrip;
    if (rowsperstrip > td->td_imagelength)
        rowsperstrip = td->td_imagelength;
    if (rowsperstrip == 0)
    {
        TIFFErrorExtR(tif, module, "rowsperstrip is zero");
        return ((tmsize_t)(-1));
    }
    stripsperplane =
        TIFFhowmany_32_maxuint_compat(td->td_imagelength, rowsperstrip);
    stripinplane = (strip % stripsperplane);
    if (pplane)
        *pplane = (uint16_t)(strip / stripsperplane);
    rows = td->td_imagelength - stripinplane * rowsperstrip;
    if (rows > rowsperstrip)
        rows = rowsperstrip;
    stripsize = TIFFVStripSize(tif, rows);
    if (stripsize == 0)
        return ((tmsize_t)(-1));
    return stripsize;
}

Referenced by _TIFFReadEncodedStripAndAllocBuffer(), and TIFFReadEncodedStrip().

TIFFReadEncodedTile()

tmsize_t TIFFReadEncodedTile	(	TIFF *	tif,
		uint32_t	tile,
		void *	buf,
		tmsize_t	size
	)

Definition at line 953 of file tif_read.c.

{
    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)
    {
        TIFFErrorExtR(tif, module,
                      "%" PRIu32 ": Tile out of range, max %" PRIu32, tile,
                      td->td_nstrips);
        return ((tmsize_t)(-1));
    }
 
    /* shortcut to avoid an extra memcpy() */
    if (td->td_compression == COMPRESSION_NONE && size != (tmsize_t)(-1) &&
        size >= tilesize && !isMapped(tif) &&
        ((tif->tif_flags & TIFF_NOREADRAW) == 0))
    {
        if (TIFFReadRawTile1(tif, tile, buf, tilesize, module) != tilesize)
            return ((tmsize_t)(-1));
 
        if (!isFillOrder(tif, td->td_fillorder) &&
            (tif->tif_flags & TIFF_NOBITREV) == 0)
            TIFFReverseBits(buf, tilesize);
 
        (*tif->tif_postdecode)(tif, buf, tilesize);
        return (tilesize);
    }
 
    if (size == (tmsize_t)(-1))
        size = tilesize;
    else if (size > tilesize)
        size = tilesize;
    if (!TIFFFillTile(tif, tile))
    {
        /* See TIFFReadEncodedStrip comment regarding TIFFTAG_FAXFILLFUNC. */
        if (buf)
            memset(buf, 0, (size_t)size);
        return ((tmsize_t)(-1));
    }
    else if ((*tif->tif_decodetile)(tif, (uint8_t *)buf, size,
                                    (uint16_t)(tile / td->td_stripsperimage)))
    {
        (*tif->tif_postdecode)(tif, (uint8_t *)buf, size);
        return (size);
    }
    else
        return ((tmsize_t)(-1));
}

Referenced by _TIFFReadEncodedTileAndAllocBuffer(), tiff_decoder_read_tile(), and TIFFReadTile().

TIFFReadFromUserBuffer()

int TIFFReadFromUserBuffer	(	TIFF *	tif,
		uint32_t	strile,
		void *	inbuf,
		tmsize_t	insize,
		void *	outbuf,
		tmsize_t	outsize
	)

Definition at line 1545 of file tif_read.c.

{
    static const char module[] = "TIFFReadFromUserBuffer";
    TIFFDirectory *td = &tif->tif_dir;
    int ret = 1;
    uint32_t old_tif_flags = tif->tif_flags;
    tmsize_t old_rawdatasize = tif->tif_rawdatasize;
    void *old_rawdata = tif->tif_rawdata;
 
    if (tif->tif_mode == O_WRONLY)
    {
        TIFFErrorExtR(tif, tif->tif_name, "File not open for reading");
        return 0;
    }
    if (tif->tif_flags & TIFF_NOREADRAW)
    {
        TIFFErrorExtR(tif, module,
                      "Compression scheme does not support access to raw "
                      "uncompressed data");
        return 0;
    }
 
    tif->tif_flags &= ~TIFF_MYBUFFER;
    tif->tif_flags |= TIFF_BUFFERMMAP;
    tif->tif_rawdatasize = insize;
    tif->tif_rawdata = inbuf;
    tif->tif_rawdataoff = 0;
    tif->tif_rawdataloaded = insize;
 
    if (!isFillOrder(tif, td->td_fillorder) &&
        (tif->tif_flags & TIFF_NOBITREV) == 0)
    {
        TIFFReverseBits(inbuf, insize);
    }
 
    if (TIFFIsTiled(tif))
    {
        if (!TIFFStartTile(tif, strile))
        {
            ret = 0;
            /* See related TIFFReadEncodedStrip comment. */
            if (outbuf)
                memset(outbuf, 0, (size_t)outsize);
        }
        else if (!(*tif->tif_decodetile)(
                     tif, (uint8_t *)outbuf, outsize,
                     (uint16_t)(strile / td->td_stripsperimage)))
        {
            ret = 0;
        }
    }
    else
    {
        uint32_t rowsperstrip = td->td_rowsperstrip;
        uint32_t stripsperplane;
        if (rowsperstrip > td->td_imagelength)
            rowsperstrip = td->td_imagelength;
        if (rowsperstrip == 0)
        {
            TIFFErrorExtR(tif, module, "rowsperstrip is zero");
            ret = 0;
        }
        else
        {
            stripsperplane =
                TIFFhowmany_32_maxuint_compat(td->td_imagelength, rowsperstrip);
            if (!TIFFStartStrip(tif, strile))
            {
                ret = 0;
                /* See related TIFFReadEncodedStrip comment. */
                if (outbuf)
                    memset(outbuf, 0, (size_t)outsize);
            }
            else if (!(*tif->tif_decodestrip)(
                         tif, (uint8_t *)outbuf, outsize,
                         (uint16_t)(strile / stripsperplane)))
            {
                ret = 0;
            }
        }
    }
    if (ret)
    {
        (*tif->tif_postdecode)(tif, (uint8_t *)outbuf, outsize);
    }
 
    if (!isFillOrder(tif, td->td_fillorder) &&
        (tif->tif_flags & TIFF_NOBITREV) == 0)
    {
        TIFFReverseBits(inbuf, insize);
    }
 
    tif->tif_flags = (old_tif_flags & (TIFF_MYBUFFER | TIFF_BUFFERMMAP)) |
                     (tif->tif_flags & ~(TIFF_MYBUFFER | TIFF_BUFFERMMAP));
    tif->tif_rawdatasize = old_rawdatasize;
    tif->tif_rawdata = old_rawdata;
    tif->tif_rawdataoff = 0;
    tif->tif_rawdataloaded = 0;
 
    return ret;
}

TIFFReadRawStrip()

tmsize_t TIFFReadRawStrip	(	TIFF *	tif,
		uint32_t	strip,
		void *	buf,
		tmsize_t	size
	)

Definition at line 717 of file tif_read.c.

{
    static const char module[] = "TIFFReadRawStrip";
    TIFFDirectory *td = &tif->tif_dir;
    uint64_t bytecount64;
    tmsize_t bytecountm;
 
    if (!TIFFCheckRead(tif, 0))
        return ((tmsize_t)(-1));
    if (strip >= td->td_nstrips)
    {
        TIFFErrorExtR(tif, module,
                      "%" PRIu32 ": Strip out of range, max %" PRIu32, strip,
                      td->td_nstrips);
        return ((tmsize_t)(-1));
    }
    if (tif->tif_flags & TIFF_NOREADRAW)
    {
        TIFFErrorExtR(tif, module,
                      "Compression scheme does not support access to raw "
                      "uncompressed data");
        return ((tmsize_t)(-1));
    }
    bytecount64 = TIFFGetStrileByteCount(tif, strip);
    if (size != (tmsize_t)(-1) && (uint64_t)size <= bytecount64)
        bytecountm = size;
    else
        bytecountm = _TIFFCastUInt64ToSSize(tif, bytecount64, module);
    if (bytecountm == 0)
    {
        return ((tmsize_t)(-1));
    }
    return (TIFFReadRawStrip1(tif, strip, buf, bytecountm, module));
}

TIFFReadRawStrip1()

static tmsize_t TIFFReadRawStrip1 ( TIFF *  tif, uint32_t  strip, void *  buf, tmsize_t  size, const char *  module  )

static

Definition at line 620 of file tif_read.c.

{
    assert((tif->tif_flags & TIFF_NOREADRAW) == 0);
    if (!isMapped(tif))
    {
        tmsize_t cc;
 
        if (!SeekOK(tif, TIFFGetStrileOffset(tif, strip)))
        {
            TIFFErrorExtR(tif, module,
                          "Seek error at scanline %" PRIu32 ", strip %" PRIu32,
                          tif->tif_row, strip);
            return ((tmsize_t)(-1));
        }
        cc = TIFFReadFile(tif, buf, size);
        if (cc != size)
        {
            TIFFErrorExtR(tif, module,
                          "Read error at scanline %" PRIu32
                          "; got %" TIFF_SSIZE_FORMAT
                          " bytes, expected %" TIFF_SSIZE_FORMAT,
                          tif->tif_row, cc, size);
            return ((tmsize_t)(-1));
        }
    }
    else
    {
        tmsize_t ma = 0;
        tmsize_t n;
        if ((TIFFGetStrileOffset(tif, strip) > (uint64_t)TIFF_TMSIZE_T_MAX) ||
            ((ma = (tmsize_t)TIFFGetStrileOffset(tif, strip)) > tif->tif_size))
        {
            n = 0;
        }
        else if (ma > TIFF_TMSIZE_T_MAX - size)
        {
            n = 0;
        }
        else
        {
            tmsize_t mb = ma + size;
            if (mb > tif->tif_size)
                n = tif->tif_size - ma;
            else
                n = size;
        }
        if (n != size)
        {
            TIFFErrorExtR(tif, module,
                          "Read error at scanline %" PRIu32 ", strip %" PRIu32
                          "; got %" TIFF_SSIZE_FORMAT
                          " bytes, expected %" TIFF_SSIZE_FORMAT,
                          tif->tif_row, strip, n, size);
            return ((tmsize_t)(-1));
        }
        _TIFFmemcpy(buf, tif->tif_base + ma, size);
    }
    return (size);
}

Referenced by TIFFFillStrip(), TIFFReadEncodedStrip(), and TIFFReadRawStrip().

TIFFReadRawStripOrTile2()

static tmsize_t TIFFReadRawStripOrTile2 ( TIFF *  tif, uint32_t  strip_or_tile, int  is_strip, tmsize_t  size, const char *  module  )

static

Definition at line 681 of file tif_read.c.

{
    assert(!isMapped(tif));
    assert((tif->tif_flags & TIFF_NOREADRAW) == 0);
 
    if (!SeekOK(tif, TIFFGetStrileOffset(tif, strip_or_tile)))
    {
        if (is_strip)
        {
            TIFFErrorExtR(tif, module,
                          "Seek error at scanline %" PRIu32 ", strip %" PRIu32,
                          tif->tif_row, strip_or_tile);
        }
        else
        {
            TIFFErrorExtR(tif, module,
                          "Seek error at row %" PRIu32 ", col %" PRIu32
                          ", tile %" PRIu32,
                          tif->tif_row, tif->tif_col, strip_or_tile);
        }
        return ((tmsize_t)(-1));
    }
 
    if (!TIFFReadAndRealloc(tif, size, 0, is_strip, strip_or_tile, module))
    {
        return ((tmsize_t)(-1));
    }
 
    return (size);
}

Referenced by TIFFFillStrip(), and TIFFFillTile().

TIFFReadRawTile()

tmsize_t TIFFReadRawTile	(	TIFF *	tif,
		uint32_t	tile,
		void *	buf,
		tmsize_t	size
	)

Definition at line 1176 of file tif_read.c.

{
    static const char module[] = "TIFFReadRawTile";
    TIFFDirectory *td = &tif->tif_dir;
    uint64_t bytecount64;
    tmsize_t bytecountm;
 
    if (!TIFFCheckRead(tif, 1))
        return ((tmsize_t)(-1));
    if (tile >= td->td_nstrips)
    {
        TIFFErrorExtR(tif, module,
                      "%" PRIu32 ": Tile out of range, max %" PRIu32, tile,
                      td->td_nstrips);
        return ((tmsize_t)(-1));
    }
    if (tif->tif_flags & TIFF_NOREADRAW)
    {
        TIFFErrorExtR(tif, module,
                      "Compression scheme does not support access to raw "
                      "uncompressed data");
        return ((tmsize_t)(-1));
    }
    bytecount64 = TIFFGetStrileByteCount(tif, tile);
    if (size != (tmsize_t)(-1) && (uint64_t)size <= bytecount64)
        bytecountm = size;
    else
        bytecountm = _TIFFCastUInt64ToSSize(tif, bytecount64, module);
    if (bytecountm == 0)
    {
        return ((tmsize_t)(-1));
    }
    return (TIFFReadRawTile1(tif, tile, buf, bytecountm, module));
}

TIFFReadRawTile1()

static tmsize_t TIFFReadRawTile1 ( TIFF *  tif, uint32_t  tile, void *  buf, tmsize_t  size, const char *  module  )

static

Definition at line 1119 of file tif_read.c.

{
    assert((tif->tif_flags & TIFF_NOREADRAW) == 0);
    if (!isMapped(tif))
    {
        tmsize_t cc;
 
        if (!SeekOK(tif, TIFFGetStrileOffset(tif, tile)))
        {
            TIFFErrorExtR(tif, module,
                          "Seek error at row %" PRIu32 ", col %" PRIu32
                          ", tile %" PRIu32,
                          tif->tif_row, tif->tif_col, tile);
            return ((tmsize_t)(-1));
        }
        cc = TIFFReadFile(tif, buf, size);
        if (cc != size)
        {
            TIFFErrorExtR(tif, module,
                          "Read error at row %" PRIu32 ", col %" PRIu32
                          "; got %" TIFF_SSIZE_FORMAT
                          " bytes, expected %" TIFF_SSIZE_FORMAT,
                          tif->tif_row, tif->tif_col, cc, size);
            return ((tmsize_t)(-1));
        }
    }
    else
    {
        tmsize_t ma, mb;
        tmsize_t n;
        ma = (tmsize_t)TIFFGetStrileOffset(tif, tile);
        mb = ma + size;
        if ((TIFFGetStrileOffset(tif, tile) > (uint64_t)TIFF_TMSIZE_T_MAX) ||
            (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)
        {
            TIFFErrorExtR(tif, module,
                          "Read error at row %" PRIu32 ", col %" PRIu32
                          ", tile %" PRIu32 "; got %" TIFF_SSIZE_FORMAT
                          " bytes, expected %" TIFF_SSIZE_FORMAT,
                          tif->tif_row, tif->tif_col, tile, n, size);
            return ((tmsize_t)(-1));
        }
        _TIFFmemcpy(buf, tif->tif_base + ma, size);
    }
    return (size);
}

Referenced by TIFFFillTile(), TIFFReadEncodedTile(), and TIFFReadRawTile().

TIFFReadScanline()

int TIFFReadScanline	(	TIFF *	tif,
		void *	buf,
		uint32_t	row,
		uint16_t	sample
	)

Definition at line 454 of file tif_read.c.

{
    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_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, (uint8_t *)buf, tif->tif_scanlinesize);
    }
    else
    {
        /* See TIFFReadEncodedStrip comment regarding TIFFTAG_FAXFILLFUNC. */
        if (buf)
            memset(buf, 0, (size_t)tif->tif_scanlinesize);
    }
    return (e > 0 ? 1 : -1);
}

TIFFReadTile()

tmsize_t TIFFReadTile	(	TIFF *	tif,
		void *	buf,
		uint32_t	x,
		uint32_t	y,
		uint32_t	z,
		uint16_t	s
	)

Definition at line 940 of file tif_read.c.

{
    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)));
}

Referenced by gtTileSeparate().

TIFFSeek()

static int TIFFSeek ( TIFF *  tif, uint32_t  row, uint16_t  sample  )

static

Definition at line 309 of file tif_read.c.

{
    register TIFFDirectory *td = &tif->tif_dir;
    uint32_t strip;
    int whole_strip;
    tmsize_t read_ahead = 0;
 
    /*
    ** Establish what strip we are working from.
    */
    if (row >= td->td_imagelength)
    { /* out of range */
        TIFFErrorExtR(tif, tif->tif_name,
                      "%" PRIu32 ": Row out of range, max %" PRIu32 "", row,
                      td->td_imagelength);
        return (0);
    }
    if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
    {
        if (sample >= td->td_samplesperpixel)
        {
            TIFFErrorExtR(tif, tif->tif_name,
                          "%" PRIu16 ": Sample out of range, max %" PRIu16 "",
                          sample, td->td_samplesperpixel);
            return (0);
        }
        strip = (uint32_t)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)
    whole_strip = TIFFGetStrileByteCount(tif, strip) < 10 || isMapped(tif);
    if (td->td_compression == COMPRESSION_LERC ||
        td->td_compression == COMPRESSION_JBIG)
    {
        /* Ideally plugins should have a way to declare they don't support
         * chunk strip */
        whole_strip = 1;
    }
 
    if (!whole_strip)
    {
        /* 16 is for YCbCr mode where we may need to read 16 */
        /* lines at a time to get a decompressed line, and 5000 */
        /* is some constant value, for example for JPEG tables */
 
        /* coverity[dead_error_line:SUPPRESS] */
        if (tif->tif_scanlinesize < TIFF_TMSIZE_T_MAX / 16 &&
            tif->tif_scanlinesize * 16 < TIFF_TMSIZE_T_MAX - 5000)
        {
            read_ahead = tif->tif_scanlinesize * 16 + 5000;
        }
        else
        {
            read_ahead = tif->tif_scanlinesize;
        }
    }
#else
    whole_strip = 1;
#endif
 
    /*
     * 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);
        }
#if defined(CHUNKY_STRIP_READ_SUPPORT)
        else
        {
            if (!TIFFFillStripPartial(tif, strip, read_ahead, 1))
                return 0;
        }
#endif
    }
 
#if defined(CHUNKY_STRIP_READ_SUPPORT)
    /*
    ** If we already have some data loaded, do we need to read some more?
    */
    else if (!whole_strip)
    {
        /* coverity[dead_error_line:SUPPRESS] */
        if (((tif->tif_rawdata + tif->tif_rawdataloaded) - tif->tif_rawcp) <
                read_ahead &&
            (uint64_t)tif->tif_rawdataoff + tif->tif_rawdataloaded <
                TIFFGetStrileByteCount(tif, strip))
        {
            if (!TIFFFillStripPartial(tif, strip, read_ahead, 0))
                return 0;
        }
    }
#endif
 
    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);
}

Referenced by TIFFReadScanline().

TIFFStartStrip()

static int TIFFStartStrip ( TIFF *  tif, uint32_t  strip  )

static

Definition at line 1424 of file tif_read.c.

{
    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_flags &= ~TIFF_BUF4WRITE;
 
    if (tif->tif_flags & TIFF_NOREADRAW)
    {
        tif->tif_rawcp = NULL;
        tif->tif_rawcc = 0;
    }
    else
    {
        tif->tif_rawcp = tif->tif_rawdata;
        if (tif->tif_rawdataloaded > 0)
            tif->tif_rawcc = tif->tif_rawdataloaded;
        else
            tif->tif_rawcc = (tmsize_t)TIFFGetStrileByteCount(tif, strip);
    }
    if ((*tif->tif_predecode)(tif, (uint16_t)(strip / td->td_stripsperimage)) ==
        0)
    {
        /* Needed for example for scanline access, if tif_predecode */
        /* fails, and we try to read the same strip again. Without invalidating
         */
        /* tif_curstrip, we'd call tif_decoderow() on a possibly invalid */
        /* codec state. */
        tif->tif_curstrip = NOSTRIP;
        return 0;
    }
    return 1;
}

Referenced by TIFFFillStrip(), TIFFFillStripPartial(), TIFFReadFromUserBuffer(), and TIFFSeek().

TIFFStartTile()

static int TIFFStartTile ( TIFF *  tif, uint32_t  tile  )

static

Definition at line 1469 of file tif_read.c.

{
    static const char module[] = "TIFFStartTile";
    TIFFDirectory *td = &tif->tif_dir;
    uint32_t howmany32;
 
    if ((tif->tif_flags & TIFF_CODERSETUP) == 0)
    {
        if (!(*tif->tif_setupdecode)(tif))
            return (0);
        tif->tif_flags |= TIFF_CODERSETUP;
    }
    tif->tif_curtile = tile;
    if (td->td_tilewidth == 0)
    {
        TIFFErrorExtR(tif, module, "Zero tilewidth");
        return 0;
    }
    howmany32 = TIFFhowmany_32(td->td_imagewidth, td->td_tilewidth);
    if (howmany32 == 0)
    {
        TIFFErrorExtR(tif, module, "Zero tiles");
        return 0;
    }
    tif->tif_row = (tile % howmany32) * td->td_tilelength;
    howmany32 = TIFFhowmany_32(td->td_imagelength, td->td_tilelength);
    if (howmany32 == 0)
    {
        TIFFErrorExtR(tif, module, "Zero tiles");
        return 0;
    }
    tif->tif_col = (tile % howmany32) * 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;
        if (tif->tif_rawdataloaded > 0)
            tif->tif_rawcc = tif->tif_rawdataloaded;
        else
            tif->tif_rawcc = (tmsize_t)TIFFGetStrileByteCount(tif, tile);
    }
    return (
        (*tif->tif_predecode)(tif, (uint16_t)(tile / td->td_stripsperimage)));
}

Referenced by TIFFFillTile(), and TIFFReadFromUserBuffer().