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1/* $Id: tif_compress.c,v 1.22 2010-03-10 18:56:48 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/*
28 * TIFF Library
29 *
30 * Compression Scheme Configuration Support.
31 */
32#include "tiffiop.h"
33
34static int
35TIFFNoEncode(TIFF* tif, const char* method)
36{
37 const TIFFCodec* c = TIFFFindCODEC(tif->tif_dir.td_compression);
38
39 if (c) {
40 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
41 "%s %s encoding is not implemented",
42 c->name, method);
43 } else {
44 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
45 "Compression scheme %u %s encoding is not implemented",
46 tif->tif_dir.td_compression, method);
47 }
48 return (-1);
49}
50
51int
52_TIFFNoRowEncode(TIFF* tif, uint8* pp, tmsize_t cc, uint16 s)
53{
54 (void) pp; (void) cc; (void) s;
55 return (TIFFNoEncode(tif, "scanline"));
56}
57
58int
59_TIFFNoStripEncode(TIFF* tif, uint8* pp, tmsize_t cc, uint16 s)
60{
61 (void) pp; (void) cc; (void) s;
62 return (TIFFNoEncode(tif, "strip"));
63}
64
65int
66_TIFFNoTileEncode(TIFF* tif, uint8* pp, tmsize_t cc, uint16 s)
67{
68 (void) pp; (void) cc; (void) s;
69 return (TIFFNoEncode(tif, "tile"));
70}
71
72static int
73TIFFNoDecode(TIFF* tif, const char* method)
74{
75 const TIFFCodec* c = TIFFFindCODEC(tif->tif_dir.td_compression);
76
77 if (c)
78 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
79 "%s %s decoding is not implemented",
80 c->name, method);
81 else
82 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
83 "Compression scheme %u %s decoding is not implemented",
84 tif->tif_dir.td_compression, method);
85 return (-1);
86}
87
88int
89_TIFFNoFixupTags(TIFF* tif)
90{
91 (void) tif;
92 return (1);
93}
94
95int
96_TIFFNoRowDecode(TIFF* tif, uint8* pp, tmsize_t cc, uint16 s)
97{
98 (void) pp; (void) cc; (void) s;
99 return (TIFFNoDecode(tif, "scanline"));
100}
101
102int
103_TIFFNoStripDecode(TIFF* tif, uint8* pp, tmsize_t cc, uint16 s)
104{
105 (void) pp; (void) cc; (void) s;
106 return (TIFFNoDecode(tif, "strip"));
107}
108
109int
110_TIFFNoTileDecode(TIFF* tif, uint8* pp, tmsize_t cc, uint16 s)
111{
112 (void) pp; (void) cc; (void) s;
113 return (TIFFNoDecode(tif, "tile"));
114}
115
116int
117_TIFFNoSeek(TIFF* tif, uint32 off)
118{
119 (void) off;
120 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
121 "Compression algorithm does not support random access");
122 return (0);
123}
124
125int
126_TIFFNoPreCode(TIFF* tif, uint16 s)
127{
128 (void) tif; (void) s;
129 return (1);
130}
131
132static int _TIFFtrue(TIFF* tif) { (void) tif; return (1); }
133static void _TIFFvoid(TIFF* tif) { (void) tif; }
134
135void
136_TIFFSetDefaultCompressionState(TIFF* tif)
137{
138 tif->tif_fixuptags = _TIFFNoFixupTags;
139 tif->tif_decodestatus = TRUE;
140 tif->tif_setupdecode = _TIFFtrue;
141 tif->tif_predecode = _TIFFNoPreCode;
142 tif->tif_decoderow = _TIFFNoRowDecode;
143 tif->tif_decodestrip = _TIFFNoStripDecode;
144 tif->tif_decodetile = _TIFFNoTileDecode;
145 tif->tif_encodestatus = TRUE;
146 tif->tif_setupencode = _TIFFtrue;
147 tif->tif_preencode = _TIFFNoPreCode;
148 tif->tif_postencode = _TIFFtrue;
149 tif->tif_encoderow = _TIFFNoRowEncode;
150 tif->tif_encodestrip = _TIFFNoStripEncode;
151 tif->tif_encodetile = _TIFFNoTileEncode;
152 tif->tif_close = _TIFFvoid;
153 tif->tif_seek = _TIFFNoSeek;
154 tif->tif_cleanup = _TIFFvoid;
155 tif->tif_defstripsize = _TIFFDefaultStripSize;
156 tif->tif_deftilesize = _TIFFDefaultTileSize;
157 tif->tif_flags &= ~(TIFF_NOBITREV|TIFF_NOREADRAW);
158}
159
160int
161TIFFSetCompressionScheme(TIFF* tif, int scheme)
162{
163 const TIFFCodec *c = TIFFFindCODEC((uint16) scheme);
164
165 _TIFFSetDefaultCompressionState(tif);
166 /*
167 * Don't treat an unknown compression scheme as an error.
168 * This permits applications to open files with data that
169 * the library does not have builtin support for, but which
170 * may still be meaningful.
171 */
172 return (c ? (*c->init)(tif, scheme) : 1);
173}
174
175/*
176 * Other compression schemes may be registered. Registered
177 * schemes can also override the builtin versions provided
178 * by this library.
179 */
180typedef struct _codec {
181 struct _codec* next;
182 TIFFCodec* info;
183} codec_t;
184static codec_t* registeredCODECS = NULL;
185
186const TIFFCodec*
187TIFFFindCODEC(uint16 scheme)
188{
189 const TIFFCodec* c;
190 codec_t* cd;
191
192 for (cd = registeredCODECS; cd; cd = cd->next)
193 if (cd->info->scheme == scheme)
194 return ((const TIFFCodec*) cd->info);
195 for (c = _TIFFBuiltinCODECS; c->name; c++)
196 if (c->scheme == scheme)
197 return (c);
198 return ((const TIFFCodec*) 0);
199}
200
201TIFFCodec*
202TIFFRegisterCODEC(uint16 scheme, const char* name, TIFFInitMethod init)
203{
204 codec_t* cd = (codec_t*)
205 _TIFFmalloc((tmsize_t)(sizeof (codec_t) + sizeof (TIFFCodec) + strlen(name)+1));
206
207 if (cd != NULL) {
208 cd->info = (TIFFCodec*) ((uint8*) cd + sizeof (codec_t));
209 cd->info->name = (char*)
210 ((uint8*) cd->info + sizeof (TIFFCodec));
211 strcpy(cd->info->name, name);
212 cd->info->scheme = scheme;
213 cd->info->init = init;
214 cd->next = registeredCODECS;
215 registeredCODECS = cd;
216 } else {
217 TIFFErrorExt(0, "TIFFRegisterCODEC",
218 "No space to register compression scheme %s", name);
219 return NULL;
220 }
221 return (cd->info);
222}
223
224void
225TIFFUnRegisterCODEC(TIFFCodec* c)
226{
227 codec_t* cd;
228 codec_t** pcd;
229
230 for (pcd = &registeredCODECS; (cd = *pcd); pcd = &cd->next)
231 if (cd->info == c) {
232 *pcd = cd->next;
233 _TIFFfree(cd);
234 return;
235 }
236 TIFFErrorExt(0, "TIFFUnRegisterCODEC",
237 "Cannot remove compression scheme %s; not registered", c->name);
238}
239
240/************************************************************************/
241/* TIFFGetConfisuredCODECs() */
242/************************************************************************/
243
244/**
245 * Get list of configured codecs, both built-in and registered by user.
246 * Caller is responsible to free this structure.
247 *
248 * @return returns array of TIFFCodec records (the last record should be NULL)
249 * or NULL if function failed.
250 */
251
252TIFFCodec*
253TIFFGetConfiguredCODECs()
254{
255 int i = 1;
256 codec_t *cd;
257 const TIFFCodec* c;
258 TIFFCodec* codecs = NULL;
259 TIFFCodec* new_codecs;
260
261 for (cd = registeredCODECS; cd; cd = cd->next) {
262 new_codecs = (TIFFCodec *)
263 _TIFFrealloc(codecs, i * sizeof(TIFFCodec));
264 if (!new_codecs) {
265 _TIFFfree (codecs);
266 return NULL;
267 }
268 codecs = new_codecs;
269 _TIFFmemcpy(codecs + i - 1, cd, sizeof(TIFFCodec));
270 i++;
271 }
272 for (c = _TIFFBuiltinCODECS; c->name; c++) {
273 if (TIFFIsCODECConfigured(c->scheme)) {
274 new_codecs = (TIFFCodec *)
275 _TIFFrealloc(codecs, i * sizeof(TIFFCodec));
276 if (!new_codecs) {
277 _TIFFfree (codecs);
278 return NULL;
279 }
280 codecs = new_codecs;
281 _TIFFmemcpy(codecs + i - 1, (const void*)c, sizeof(TIFFCodec));
282 i++;
283 }
284 }
285
286 new_codecs = (TIFFCodec *) _TIFFrealloc(codecs, i * sizeof(TIFFCodec));
287 if (!new_codecs) {
288 _TIFFfree (codecs);
289 return NULL;
290 }
291 codecs = new_codecs;
292 _TIFFmemset(codecs + i - 1, 0, sizeof(TIFFCodec));
293
294 return codecs;
295}
296
297/* vim: set ts=8 sts=8 sw=8 noet: */
298/*
299 * Local Variables:
300 * mode: c
301 * c-basic-offset: 8
302 * fill-column: 78
303 * End:
304 */
305
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