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