1 /* $Id: tif_compress.c,v 1.13.2.1 2010-06-08 18:50:41 bfriesen Exp $ */
4 * Copyright (c) 1988-1997 Sam Leffler
5 * Copyright (c) 1991-1997 Silicon Graphics, Inc.
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.
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.
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
30 * Compression Scheme Configuration Support.
35 TIFFNoEncode(TIFF* tif, const char* method)
37 const TIFFCodec* c = TIFFFindCODEC(tif->tif_dir.td_compression);
40 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
41 "%s %s encoding is not implemented",
44 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
45 "Compression scheme %u %s encoding is not implemented",
46 tif->tif_dir.td_compression, method);
52 _TIFFNoRowEncode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)
54 (void) pp; (void) cc; (void) s;
55 return (TIFFNoEncode(tif, "scanline"));
59 _TIFFNoStripEncode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)
61 (void) pp; (void) cc; (void) s;
62 return (TIFFNoEncode(tif, "strip"));
66 _TIFFNoTileEncode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)
68 (void) pp; (void) cc; (void) s;
69 return (TIFFNoEncode(tif, "tile"));
73 TIFFNoDecode(TIFF* tif, const char* method)
75 const TIFFCodec* c = TIFFFindCODEC(tif->tif_dir.td_compression);
78 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
79 "%s %s decoding is not implemented",
82 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
83 "Compression scheme %u %s decoding is not implemented",
84 tif->tif_dir.td_compression, method);
89 _TIFFNoRowDecode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)
91 (void) pp; (void) cc; (void) s;
92 return (TIFFNoDecode(tif, "scanline"));
96 _TIFFNoStripDecode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)
98 (void) pp; (void) cc; (void) s;
99 return (TIFFNoDecode(tif, "strip"));
103 _TIFFNoTileDecode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)
105 (void) pp; (void) cc; (void) s;
106 return (TIFFNoDecode(tif, "tile"));
110 _TIFFNoSeek(TIFF* tif, uint32 off)
113 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
114 "Compression algorithm does not support random access");
119 _TIFFNoPreCode(TIFF* tif, tsample_t s)
121 (void) tif; (void) s;
125 static int _TIFFtrue(TIFF* tif) { (void) tif; return (1); }
126 static void _TIFFvoid(TIFF* tif) { (void) tif; }
129 _TIFFSetDefaultCompressionState(TIFF* tif)
131 tif->tif_decodestatus = TRUE;
132 tif->tif_setupdecode = _TIFFtrue;
133 tif->tif_predecode = _TIFFNoPreCode;
134 tif->tif_decoderow = _TIFFNoRowDecode;
135 tif->tif_decodestrip = _TIFFNoStripDecode;
136 tif->tif_decodetile = _TIFFNoTileDecode;
137 tif->tif_encodestatus = TRUE;
138 tif->tif_setupencode = _TIFFtrue;
139 tif->tif_preencode = _TIFFNoPreCode;
140 tif->tif_postencode = _TIFFtrue;
141 tif->tif_encoderow = _TIFFNoRowEncode;
142 tif->tif_encodestrip = _TIFFNoStripEncode;
143 tif->tif_encodetile = _TIFFNoTileEncode;
144 tif->tif_close = _TIFFvoid;
145 tif->tif_seek = _TIFFNoSeek;
146 tif->tif_cleanup = _TIFFvoid;
147 tif->tif_defstripsize = _TIFFDefaultStripSize;
148 tif->tif_deftilesize = _TIFFDefaultTileSize;
149 tif->tif_flags &= ~(TIFF_NOBITREV|TIFF_NOREADRAW);
153 TIFFSetCompressionScheme(TIFF* tif, int scheme)
155 const TIFFCodec *c = TIFFFindCODEC((uint16) scheme);
157 _TIFFSetDefaultCompressionState(tif);
159 * Don't treat an unknown compression scheme as an error.
160 * This permits applications to open files with data that
161 * the library does not have builtin support for, but which
162 * may still be meaningful.
164 return (c ? (*c->init)(tif, scheme) : 1);
168 * Other compression schemes may be registered. Registered
169 * schemes can also override the builtin versions provided
172 typedef struct _codec {
176 static codec_t* registeredCODECS = NULL;
179 TIFFFindCODEC(uint16 scheme)
184 for (cd = registeredCODECS; cd; cd = cd->next)
185 if (cd->info->scheme == scheme)
186 return ((const TIFFCodec*) cd->info);
187 for (c = _TIFFBuiltinCODECS; c->name; c++)
188 if (c->scheme == scheme)
190 return ((const TIFFCodec*) 0);
194 TIFFRegisterCODEC(uint16 scheme, const char* name, TIFFInitMethod init)
196 codec_t* cd = (codec_t*)
197 _TIFFmalloc(sizeof (codec_t) + sizeof (TIFFCodec) + strlen(name)+1);
200 cd->info = (TIFFCodec*) ((tidata_t) cd + sizeof (codec_t));
201 cd->info->name = (char*)
202 ((tidata_t) cd->info + sizeof (TIFFCodec));
203 strcpy(cd->info->name, name);
204 cd->info->scheme = scheme;
205 cd->info->init = init;
206 cd->next = registeredCODECS;
207 registeredCODECS = cd;
209 TIFFErrorExt(0, "TIFFRegisterCODEC",
210 "No space to register compression scheme %s", name);
217 TIFFUnRegisterCODEC(TIFFCodec* c)
222 for (pcd = ®isteredCODECS; (cd = *pcd); pcd = &cd->next)
228 TIFFErrorExt(0, "TIFFUnRegisterCODEC",
229 "Cannot remove compression scheme %s; not registered", c->name);
232 /************************************************************************/
233 /* TIFFGetConfisuredCODECs() */
234 /************************************************************************/
237 * Get list of configured codecs, both built-in and registered by user.
238 * Caller is responsible to free this structure.
240 * @return returns array of TIFFCodec records (the last record should be NULL)
241 * or NULL if function failed.
245 TIFFGetConfiguredCODECs()
250 TIFFCodec *codecs = NULL, *new_codecs;
252 for (cd = registeredCODECS; cd; cd = cd->next) {
253 new_codecs = (TIFFCodec *)
254 _TIFFrealloc(codecs, i * sizeof(TIFFCodec));
260 _TIFFmemcpy(codecs + i - 1, cd, sizeof(TIFFCodec));
263 for (c = _TIFFBuiltinCODECS; c->name; c++) {
264 if (TIFFIsCODECConfigured(c->scheme)) {
265 new_codecs = (TIFFCodec *)
266 _TIFFrealloc(codecs, i * sizeof(TIFFCodec));
272 _TIFFmemcpy(codecs + i - 1, (const tdata_t)c, sizeof(TIFFCodec));
277 new_codecs = (TIFFCodec *) _TIFFrealloc(codecs, i * sizeof(TIFFCodec));
283 _TIFFmemset(codecs + i - 1, 0, sizeof(TIFFCodec));
288 /* vim: set ts=8 sts=8 sw=8 noet: */