diff options
Diffstat (limited to 'plugins/FreeImage/src/LibTIFF/tif_next.c')
| -rw-r--r-- | plugins/FreeImage/src/LibTIFF/tif_next.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/plugins/FreeImage/src/LibTIFF/tif_next.c b/plugins/FreeImage/src/LibTIFF/tif_next.c new file mode 100644 index 0000000000..3fa6406e68 --- /dev/null +++ b/plugins/FreeImage/src/LibTIFF/tif_next.c @@ -0,0 +1,154 @@ +/* $Id: tif_next.c,v 1.37 2011/04/10 17:14:09 drolon 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.
+ */
+
+#include "tiffiop.h"
+#ifdef NEXT_SUPPORT
+/*
+ * TIFF Library.
+ *
+ * NeXT 2-bit Grey Scale Compression Algorithm Support
+ */
+
+#define SETPIXEL(op, v) { \
+ switch (npixels++ & 3) { \
+ case 0: op[0] = (unsigned char) ((v) << 6); break; \
+ case 1: op[0] |= (v) << 4; break; \
+ case 2: op[0] |= (v) << 2; break; \
+ case 3: *op++ |= (v); break; \
+ } \
+}
+
+#define LITERALROW 0x00
+#define LITERALSPAN 0x40
+#define WHITE ((1<<2)-1)
+
+static int
+NeXTDecode(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s)
+{
+ unsigned char *bp, *op;
+ tsize_t cc;
+ tidata_t row;
+ tsize_t scanline, n;
+
+ (void) s;
+ /*
+ * Each scanline is assumed to start off as all
+ * white (we assume a PhotometricInterpretation
+ * of ``min-is-black'').
+ */
+ for (op = buf, cc = occ; cc-- > 0;)
+ *op++ = 0xff;
+
+ bp = (unsigned char *)tif->tif_rawcp;
+ cc = tif->tif_rawcc;
+ scanline = tif->tif_scanlinesize;
+ for (row = buf; occ > 0; occ -= scanline, row += scanline) {
+ n = *bp++, cc--;
+ switch (n) {
+ case LITERALROW:
+ /*
+ * The entire scanline is given as literal values.
+ */
+ if (cc < scanline)
+ goto bad;
+ _TIFFmemcpy(row, bp, scanline);
+ bp += scanline;
+ cc -= scanline;
+ break;
+ case LITERALSPAN: {
+ tsize_t off;
+ /*
+ * The scanline has a literal span that begins at some
+ * offset.
+ */
+ off = (bp[0] * 256) + bp[1];
+ n = (bp[2] * 256) + bp[3];
+ if (cc < 4+n || off+n > scanline)
+ goto bad;
+ _TIFFmemcpy(row+off, bp+4, n);
+ bp += 4+n;
+ cc -= 4+n;
+ break;
+ }
+ default: {
+ uint32 npixels = 0, grey;
+ uint32 imagewidth = tif->tif_dir.td_imagewidth;
+
+ /*
+ * The scanline is composed of a sequence of constant
+ * color ``runs''. We shift into ``run mode'' and
+ * interpret bytes as codes of the form
+ * <color><npixels> until we've filled the scanline.
+ */
+ op = row;
+ for (;;) {
+ grey = (n>>6) & 0x3;
+ n &= 0x3f;
+ /*
+ * Ensure the run does not exceed the scanline
+ * bounds, potentially resulting in a security
+ * issue.
+ */
+ while (n-- > 0 && npixels < imagewidth)
+ SETPIXEL(op, grey);
+ if (npixels >= imagewidth)
+ break;
+ if (cc == 0)
+ goto bad;
+ n = *bp++, cc--;
+ }
+ break;
+ }
+ }
+ }
+ tif->tif_rawcp = (tidata_t) bp;
+ tif->tif_rawcc = cc;
+ return (1);
+bad:
+ TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "NeXTDecode: Not enough data for scanline %ld",
+ (long) tif->tif_row);
+ return (0);
+}
+
+int
+TIFFInitNeXT(TIFF* tif, int scheme)
+{
+ (void) scheme;
+ tif->tif_decoderow = NeXTDecode;
+ tif->tif_decodestrip = NeXTDecode;
+ tif->tif_decodetile = NeXTDecode;
+ return (1);
+}
+#endif /* NEXT_SUPPORT */
+
+/* vim: set ts=8 sts=8 sw=8 noet: */
+/*
+ * Local Variables:
+ * mode: c
+ * c-basic-offset: 8
+ * fill-column: 78
+ * End:
+ */
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