1 /*
2 * Copyright (c) 1988-1997 Sam Leffler
3 * Copyright (c) 1991-1997 Silicon Graphics, Inc.
4 *
5 * Permission to use, copy, modify, distribute, and sell this software and
6 * its documentation for any purpose is hereby granted without fee, provided
7 * that (i) the above copyright notices and this permission notice appear in
8 * all copies of the software and related documentation, and (ii) the names of
9 * Sam Leffler and Silicon Graphics may not be used in any advertising or
10 * publicity relating to the software without the specific, prior written
11 * permission of Sam Leffler and Silicon Graphics.
12 *
13 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
14 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
15 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
16 *
17 * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
18 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
19 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
20 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
21 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
22 * OF THIS SOFTWARE.
23 */
24
25 /*
26 * TIFF Library.
27 *
28 * "Null" Compression Algorithm Support.
29 */
30 #include "tiffiop.h"
31
DumpFixupTags(TIFF * tif)32 static int DumpFixupTags(TIFF *tif)
33 {
34 (void)tif;
35 return (1);
36 }
37
38 /*
39 * Encode a hunk of pixels.
40 */
DumpModeEncode(TIFF * tif,uint8_t * pp,tmsize_t cc,uint16_t s)41 static int DumpModeEncode(TIFF *tif, uint8_t *pp, tmsize_t cc, uint16_t s)
42 {
43 (void)s;
44 while (cc > 0)
45 {
46 tmsize_t n;
47
48 n = cc;
49 if (tif->tif_rawcc + n > tif->tif_rawdatasize)
50 n = tif->tif_rawdatasize - tif->tif_rawcc;
51
52 assert(n > 0);
53
54 /*
55 * Avoid copy if client has setup raw
56 * data buffer to avoid extra copy.
57 */
58 if (tif->tif_rawcp != pp)
59 _TIFFmemcpy(tif->tif_rawcp, pp, n);
60 tif->tif_rawcp += n;
61 tif->tif_rawcc += n;
62 pp += n;
63 cc -= n;
64 if (tif->tif_rawcc >= tif->tif_rawdatasize && !TIFFFlushData1(tif))
65 return (0);
66 }
67 return (1);
68 }
69
70 /*
71 * Decode a hunk of pixels.
72 */
DumpModeDecode(TIFF * tif,uint8_t * buf,tmsize_t cc,uint16_t s)73 static int DumpModeDecode(TIFF *tif, uint8_t *buf, tmsize_t cc, uint16_t s)
74 {
75 static const char module[] = "DumpModeDecode";
76 (void)s;
77 if (tif->tif_rawcc < cc)
78 {
79 TIFFErrorExtR(tif, module,
80 "Not enough data for scanline %" PRIu32
81 ", expected a request for at most %" TIFF_SSIZE_FORMAT
82 " bytes, got a request for %" TIFF_SSIZE_FORMAT " bytes",
83 tif->tif_row, tif->tif_rawcc, cc);
84 return (0);
85 }
86 /*
87 * Avoid copy if client has setup raw
88 * data buffer to avoid extra copy.
89 */
90 if (tif->tif_rawcp != buf)
91 _TIFFmemcpy(buf, tif->tif_rawcp, cc);
92 tif->tif_rawcp += cc;
93 tif->tif_rawcc -= cc;
94 return (1);
95 }
96
97 /*
98 * Seek forwards nrows in the current strip.
99 */
DumpModeSeek(TIFF * tif,uint32_t nrows)100 static int DumpModeSeek(TIFF *tif, uint32_t nrows)
101 {
102 tif->tif_rawcp += nrows * tif->tif_scanlinesize;
103 tif->tif_rawcc -= nrows * tif->tif_scanlinesize;
104 return (1);
105 }
106
107 /*
108 * Initialize dump mode.
109 */
TIFFInitDumpMode(TIFF * tif,int scheme)110 int TIFFInitDumpMode(TIFF *tif, int scheme)
111 {
112 (void)scheme;
113 tif->tif_fixuptags = DumpFixupTags;
114 tif->tif_decoderow = DumpModeDecode;
115 tif->tif_decodestrip = DumpModeDecode;
116 tif->tif_decodetile = DumpModeDecode;
117 tif->tif_encoderow = DumpModeEncode;
118 tif->tif_encodestrip = DumpModeEncode;
119 tif->tif_encodetile = DumpModeEncode;
120 tif->tif_seek = DumpModeSeek;
121 return (1);
122 }
123