1 /* $Header: /cvs/maptools/cvsroot/libtiff/libtiff/tif_dumpmode.c,v 1.4 2005/12/21 12:23:13 joris 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 /*
28 * TIFF Library.
29 *
30 * "Null" Compression Algorithm Support.
31 */
32 #include "tiffiop.h"
33
34 /*
35 * Encode a hunk of pixels.
36 */
37 static int
DumpModeEncode(TIFF * tif,tidata_t pp,tsize_t cc,tsample_t s)38 DumpModeEncode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)
39 {
40 (void) s;
41 while (cc > 0) {
42 tsize_t n;
43
44 n = cc;
45 if (tif->tif_rawcc + n > tif->tif_rawdatasize)
46 n = tif->tif_rawdatasize - tif->tif_rawcc;
47
48 assert( n > 0 );
49
50 /*
51 * Avoid copy if client has setup raw
52 * data buffer to avoid extra copy.
53 */
54 if (tif->tif_rawcp != pp)
55 _TIFFmemcpy(tif->tif_rawcp, pp, n);
56 tif->tif_rawcp += n;
57 tif->tif_rawcc += n;
58 pp += n;
59 cc -= n;
60 if (tif->tif_rawcc >= tif->tif_rawdatasize &&
61 !TIFFFlushData1(tif))
62 return (-1);
63 }
64 return (1);
65 }
66
67 /*
68 * Decode a hunk of pixels.
69 */
70 static int
DumpModeDecode(TIFF * tif,tidata_t buf,tsize_t cc,tsample_t s)71 DumpModeDecode(TIFF* tif, tidata_t buf, tsize_t cc, tsample_t s)
72 {
73 (void) s;
74 if (tif->tif_rawcc < cc) {
75 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
76 "DumpModeDecode: Not enough data for scanline %d",
77 tif->tif_row);
78 return (0);
79 }
80 /*
81 * Avoid copy if client has setup raw
82 * data buffer to avoid extra copy.
83 */
84 if (tif->tif_rawcp != buf)
85 _TIFFmemcpy(buf, tif->tif_rawcp, cc);
86 tif->tif_rawcp += cc;
87 tif->tif_rawcc -= cc;
88 return (1);
89 }
90
91 /*
92 * Seek forwards nrows in the current strip.
93 */
94 static int
DumpModeSeek(TIFF * tif,uint32 nrows)95 DumpModeSeek(TIFF* tif, uint32 nrows)
96 {
97 tif->tif_rawcp += nrows * tif->tif_scanlinesize;
98 tif->tif_rawcc -= nrows * tif->tif_scanlinesize;
99 return (1);
100 }
101
102 /*
103 * Initialize dump mode.
104 */
105 int
TIFFInitDumpMode(TIFF * tif,int scheme)106 TIFFInitDumpMode(TIFF* tif, int scheme)
107 {
108 (void) scheme;
109 tif->tif_decoderow = DumpModeDecode;
110 tif->tif_decodestrip = DumpModeDecode;
111 tif->tif_decodetile = DumpModeDecode;
112 tif->tif_encoderow = DumpModeEncode;
113 tif->tif_encodestrip = DumpModeEncode;
114 tif->tif_encodetile = DumpModeEncode;
115 tif->tif_seek = DumpModeSeek;
116 return (1);
117 }
118