1 /* $Id: tif_compress.c,v 1.22 2010-03-10 18:56:48 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, uint8* pp, tmsize_t cc, uint16 s)
54 (void) pp; (void) cc; (void) s;
55 return (TIFFNoEncode(tif, "scanline"));
59 _TIFFNoStripEncode(TIFF* tif, uint8* pp, tmsize_t cc, uint16 s)
61 (void) pp; (void) cc; (void) s;
62 return (TIFFNoEncode(tif, "strip"));
66 _TIFFNoTileEncode(TIFF* tif, uint8* pp, tmsize_t cc, uint16 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 _TIFFNoFixupTags(TIFF* tif)
96 _TIFFNoRowDecode(TIFF* tif, uint8* pp, tmsize_t cc, uint16 s)
98 (void) pp; (void) cc; (void) s;
99 return (TIFFNoDecode(tif, "scanline"));
103 _TIFFNoStripDecode(TIFF* tif, uint8* pp, tmsize_t cc, uint16 s)
105 (void) pp; (void) cc; (void) s;
106 return (TIFFNoDecode(tif, "strip"));
110 _TIFFNoTileDecode(TIFF* tif, uint8* pp, tmsize_t cc, uint16 s)
112 (void) pp; (void) cc; (void) s;
113 return (TIFFNoDecode(tif, "tile"));
117 _TIFFNoSeek(TIFF* tif, uint32 off)
120 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
121 "Compression algorithm does not support random access");
126 _TIFFNoPreCode(TIFF* tif, uint16 s)
128 (void) tif; (void) s;
132 static int _TIFFtrue(TIFF* tif) { (void) tif; return (1); }
133 static void _TIFFvoid(TIFF* tif) { (void) tif; }
136 _TIFFSetDefaultCompressionState(TIFF* tif)
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);
161 TIFFSetCompressionScheme(TIFF* tif, int scheme)
163 const TIFFCodec *c = TIFFFindCODEC((uint16) scheme);
165 _TIFFSetDefaultCompressionState(tif);
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.
172 return (c ? (*c->init)(tif, scheme) : 1);
176 * Other compression schemes may be registered. Registered
177 * schemes can also override the builtin versions provided
180 typedef struct _codec {
184 static codec_t* registeredCODECS = NULL;
187 TIFFFindCODEC(uint16 scheme)
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)
198 return ((const TIFFCodec*) 0);
202 TIFFRegisterCODEC(uint16 scheme, const char* name, TIFFInitMethod init)
204 codec_t* cd = (codec_t*)
205 _TIFFmalloc((tmsize_t)(sizeof (codec_t) + sizeof (TIFFCodec) + strlen(name)+1));
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;
217 TIFFErrorExt(0, "TIFFRegisterCODEC",
218 "No space to register compression scheme %s", name);
225 TIFFUnRegisterCODEC(TIFFCodec* c)
230 for (pcd = ®isteredCODECS; (cd = *pcd); pcd = &cd->next)
236 TIFFErrorExt(0, "TIFFUnRegisterCODEC",
237 "Cannot remove compression scheme %s; not registered", c->name);
240 /************************************************************************/
241 /* TIFFGetConfisuredCODECs() */
242 /************************************************************************/
245 * Get list of configured codecs, both built-in and registered by user.
246 * Caller is responsible to free this structure.
248 * @return returns array of TIFFCodec records (the last record should be NULL)
249 * or NULL if function failed.
253 TIFFGetConfiguredCODECs()
258 TIFFCodec* codecs = NULL;
259 TIFFCodec* new_codecs;
261 for (cd = registeredCODECS; cd; cd = cd->next) {
262 new_codecs = (TIFFCodec *)
263 _TIFFrealloc(codecs, i * sizeof(TIFFCodec));
269 _TIFFmemcpy(codecs + i - 1, cd, sizeof(TIFFCodec));
272 for (c = _TIFFBuiltinCODECS; c->name; c++) {
273 if (TIFFIsCODECConfigured(c->scheme)) {
274 new_codecs = (TIFFCodec *)
275 _TIFFrealloc(codecs, i * sizeof(TIFFCodec));
281 _TIFFmemcpy(codecs + i - 1, (const void*)c, sizeof(TIFFCodec));
286 new_codecs = (TIFFCodec *) _TIFFrealloc(codecs, i * sizeof(TIFFCodec));
292 _TIFFmemset(codecs + i - 1, 0, sizeof(TIFFCodec));
297 /* vim: set ts=8 sts=8 sw=8 noet: */