+++ /dev/null
-/* $Id: tif_next.c,v 1.19 2016-09-04 21:32:56 erouault Exp $ */
-
-/*
- * Copyright (c) 1988-1997 Sam Leffler
- * Copyright (c) 1991-1997 Silicon Graphics, Inc.
- *
- * Permission to use, copy, modify, distribute, and sell this software and
- * its documentation for any purpose is hereby granted without fee, provided
- * that (i) the above copyright notices and this permission notice appear in
- * all copies of the software and related documentation, and (ii) the names of
- * Sam Leffler and Silicon Graphics may not be used in any advertising or
- * publicity relating to the software without the specific, prior written
- * permission of Sam Leffler and Silicon Graphics.
- *
- * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
- * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
- *
- * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
- * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
- * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
- * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
- * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
- * OF THIS SOFTWARE.
- */
-
-#include <precomp.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); op_offset++; break; \
- } \
-}
-
-#define LITERALROW 0x00
-#define LITERALSPAN 0x40
-#define WHITE ((1<<2)-1)
-
-static int
-NeXTDecode(TIFF* tif, uint8* buf, tmsize_t occ, uint16 s)
-{
- static const char module[] = "NeXTDecode";
- unsigned char *bp, *op;
- tmsize_t cc;
- uint8* row;
- tmsize_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 = (unsigned char*) buf, cc = occ; cc-- > 0;)
- *op++ = 0xff;
-
- bp = (unsigned char *)tif->tif_rawcp;
- cc = tif->tif_rawcc;
- scanline = tif->tif_scanlinesize;
- if (occ % scanline)
- {
- TIFFErrorExt(tif->tif_clientdata, module, "Fractional scanlines cannot be read");
- return (0);
- }
- for (row = buf; cc > 0 && 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: {
- tmsize_t off;
- /*
- * The scanline has a literal span that begins at some
- * offset.
- */
- if( cc < 4 )
- goto bad;
- 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;
- tmsize_t op_offset = 0;
- uint32 imagewidth = tif->tif_dir.td_imagewidth;
- if( isTiled(tif) )
- imagewidth = tif->tif_dir.td_tilewidth;
-
- /*
- * 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 = (uint32)((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 && op_offset < scanline)
- SETPIXEL(op, grey);
- if (npixels >= imagewidth)
- break;
- if (op_offset >= scanline ) {
- TIFFErrorExt(tif->tif_clientdata, module, "Invalid data for scanline %ld",
- (long) tif->tif_row);
- return (0);
- }
- if (cc == 0)
- goto bad;
- n = *bp++;
- cc--;
- }
- break;
- }
- }
- }
- tif->tif_rawcp = (uint8*) bp;
- tif->tif_rawcc = cc;
- return (1);
-bad:
- TIFFErrorExt(tif->tif_clientdata, module, "Not enough data for scanline %ld",
- (long) tif->tif_row);
- return (0);
-}
-
-static int
-NeXTPreDecode(TIFF* tif, uint16 s)
-{
- static const char module[] = "NeXTPreDecode";
- TIFFDirectory *td = &tif->tif_dir;
- (void)s;
-
- if( td->td_bitspersample != 2 )
- {
- TIFFErrorExt(tif->tif_clientdata, module, "Unsupported BitsPerSample = %d",
- td->td_bitspersample);
- return (0);
- }
- return (1);
-}
-
-int
-TIFFInitNeXT(TIFF* tif, int scheme)
-{
- (void) scheme;
- tif->tif_predecode = NeXTPreDecode;
- 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:
- */
projects / reactos.git / blobdiff