+#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;
+}
projects / wxWidgets.git / blobdiff