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tif_next.c
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1 /* $Id: tif_next.c,v 1.8.2.1 2010-06-08 18:50:42 bfriesen Exp $ */
2
3 /*
4 * Copyright (c) 1988-1997 Sam Leffler
5 * Copyright (c) 1991-1997 Silicon Graphics, Inc.
6 *
7 * Permission to use, copy, modify, distribute, and sell this software and
8 * its documentation for any purpose is hereby granted without fee, provided
9 * that (i) the above copyright notices and this permission notice appear in
10 * all copies of the software and related documentation, and (ii) the names of
11 * Sam Leffler and Silicon Graphics may not be used in any advertising or
12 * publicity relating to the software without the specific, prior written
13 * permission of Sam Leffler and Silicon Graphics.
14 *
15 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
17 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
18 *
19 * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
20 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
21 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
22 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
23 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
24 * OF THIS SOFTWARE.
25 */
26
27 #include "tiffiop.h"
28 #ifdef NEXT_SUPPORT
29 /*
30 * TIFF Library.
31 *
32 * NeXT 2-bit Grey Scale Compression Algorithm Support
33 */
34
35 #define SETPIXEL(op, v) { \
36 switch (npixels++ & 3) { \
37 case 0: op[0] = (unsigned char) ((v) << 6); break; \
38 case 1: op[0] |= (v) << 4; break; \
39 case 2: op[0] |= (v) << 2; break; \
40 case 3: *op++ |= (v); break; \
41 } \
42 }
43
44 #define LITERALROW 0x00
45 #define LITERALSPAN 0x40
46 #define WHITE ((1<<2)-1)
47
48 static int
49 NeXTDecode(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s)
50 {
51 unsigned char *bp, *op;
52 tsize_t cc;
53 tidata_t row;
54 tsize_t scanline, n;
55
56 (void) s;
57 /*
58 * Each scanline is assumed to start off as all
59 * white (we assume a PhotometricInterpretation
60 * of ``min-is-black'').
61 */
62 for (op = buf, cc = occ; cc-- > 0;)
63 *op++ = 0xff;
64
65 bp = (unsigned char *)tif->tif_rawcp;
66 cc = tif->tif_rawcc;
67 scanline = tif->tif_scanlinesize;
68 for (row = buf; occ > 0; occ -= scanline, row += scanline) {
69 n = *bp++, cc--;
70 switch (n) {
71 case LITERALROW:
72 /*
73 * The entire scanline is given as literal values.
74 */
75 if (cc < scanline)
76 goto bad;
77 _TIFFmemcpy(row, bp, scanline);
78 bp += scanline;
79 cc -= scanline;
80 break;
81 case LITERALSPAN: {
82 tsize_t off;
83 /*
84 * The scanline has a literal span that begins at some
85 * offset.
86 */
87 off = (bp[0] * 256) + bp[1];
88 n = (bp[2] * 256) + bp[3];
89 if (cc < 4+n || off+n > scanline)
90 goto bad;
91 _TIFFmemcpy(row+off, bp+4, n);
92 bp += 4+n;
93 cc -= 4+n;
94 break;
95 }
96 default: {
97 uint32 npixels = 0, grey;
98 uint32 imagewidth = tif->tif_dir.td_imagewidth;
99
100 /*
101 * The scanline is composed of a sequence of constant
102 * color ``runs''. We shift into ``run mode'' and
103 * interpret bytes as codes of the form
104 * <color><npixels> until we've filled the scanline.
105 */
106 op = row;
107 for (;;) {
108 grey = (n>>6) & 0x3;
109 n &= 0x3f;
110 /*
111 * Ensure the run does not exceed the scanline
112 * bounds, potentially resulting in a security
113 * issue.
114 */
115 while (n-- > 0 && npixels < imagewidth)
116 SETPIXEL(op, grey);
117 if (npixels >= imagewidth)
118 break;
119 if (cc == 0)
120 goto bad;
121 n = *bp++, cc--;
122 }
123 break;
124 }
125 }
126 }
127 tif->tif_rawcp = (tidata_t) bp;
128 tif->tif_rawcc = cc;
129 return (1);
130 bad:
131 TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "NeXTDecode: Not enough data for scanline %ld",
132 (long) tif->tif_row);
133 return (0);
134 }
135
136 int
137 TIFFInitNeXT(TIFF* tif, int scheme)
138 {
139 (void) scheme;
140 tif->tif_decoderow = NeXTDecode;
141 tif->tif_decodestrip = NeXTDecode;
142 tif->tif_decodetile = NeXTDecode;
143 return (1);
144 }
145 #endif /* NEXT_SUPPORT */
146
147 /* vim: set ts=8 sts=8 sw=8 noet: */
148 /*
149 * Local Variables:
150 * mode: c
151 * c-basic-offset: 8
152 * fill-column: 78
153 * End:
154 */
tsize_t
int32 tsize_t
Definition: tiffio.h:67
tsample_t
uint16 tsample_t
Definition: tiffio.h:63
LITERALSPAN
#define LITERALSPAN
Definition: tif_next.c:45
tiff::tif_decoderow
TIFFCodeMethod tif_decoderow
Definition: tiffiop.h:159
TIFFDirectory::td_imagewidth
uint32 td_imagewidth
Definition: tif_dir.h:41
tiff::tif_clientdata
thandle_t tif_clientdata
Definition: tiffiop.h:185
tiffiop.h
tiff::tif_name
char * tif_name
Definition: tiffiop.h:103
tiff
Definition: tiffiop.h:102
TIFFInitNeXT
int TIFFInitNeXT(TIFF *tif, int scheme)
Definition: tif_next.c:137
SETPIXEL
#define SETPIXEL(op, v)
Definition: tif_next.c:35
_TIFFmemcpy
void _TIFFmemcpy(tdata_t d, const tdata_t s, tsize_t c)
Definition: tif_acorn.c:485
tiff::tif_rawcp
tidata_t tif_rawcp
Definition: tiffiop.h:176
tiff::tif_decodestrip
TIFFCodeMethod tif_decodestrip
Definition: tiffiop.h:161
TIFFErrorExt
void TIFFErrorExt(thandle_t fd, const char *module, const char *fmt,...)
Definition: tif_error.c:63
tiff::tif_rawcc
tsize_t tif_rawcc
Definition: tiffiop.h:177
tiff::tif_decodetile
TIFFCodeMethod tif_decodetile
Definition: tiffiop.h:163
tidata_t
tidataval_t * tidata_t
Definition: tiffiop.h:91
tiff::tif_row
uint32 tif_row
Definition: tiffiop.h:139
tiff::tif_dir
TIFFDirectory tif_dir
Definition: tiffiop.h:133
tiff::tif_scanlinesize
tsize_t tif_scanlinesize
Definition: tiffiop.h:172
LITERALROW
#define LITERALROW
Definition: tif_next.c:44