1/* $Id: tif_compress.c 285 2010-07-07 11:02:56Z nijtmans $ */
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, tidata_t pp, tsize_t cc, tsample_t s)
53{
54	(void) pp; (void) cc; (void) s;
55	return (TIFFNoEncode(tif, "scanline"));
56}
57
58int
59_TIFFNoStripEncode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)
60{
61	(void) pp; (void) cc; (void) s;
62	return (TIFFNoEncode(tif, "strip"));
63}
64
65int
66_TIFFNoTileEncode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t 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_TIFFNoRowDecode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)
90{
91	(void) pp; (void) cc; (void) s;
92	return (TIFFNoDecode(tif, "scanline"));
93}
94
95int
96_TIFFNoStripDecode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)
97{
98	(void) pp; (void) cc; (void) s;
99	return (TIFFNoDecode(tif, "strip"));
100}
101
102int
103_TIFFNoTileDecode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)
104{
105	(void) pp; (void) cc; (void) s;
106	return (TIFFNoDecode(tif, "tile"));
107}
108
109int
110_TIFFNoSeek(TIFF* tif, uint32 off)
111{
112	(void) off;
113	TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
114		     "Compression algorithm does not support random access");
115	return (0);
116}
117
118int
119_TIFFNoPreCode(TIFF* tif, tsample_t s)
120{
121	(void) tif; (void) s;
122	return (1);
123}
124
125static int _TIFFtrue(TIFF* tif) { (void) tif; return (1); }
126static void _TIFFvoid(TIFF* tif) { (void) tif; }
127
128void
129_TIFFSetDefaultCompressionState(TIFF* tif)
130{
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);
150}
151
152int
153TIFFSetCompressionScheme(TIFF* tif, int scheme)
154{
155	const TIFFCodec *c = TIFFFindCODEC((uint16) scheme);
156
157	_TIFFSetDefaultCompressionState(tif);
158	/*
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.
163	 */
164	return (c ? (*c->init)(tif, scheme) : 1);
165}
166
167/*
168 * Other compression schemes may be registered.  Registered
169 * schemes can also override the builtin versions provided
170 * by this library.
171 */
172typedef struct _codec {
173	struct _codec*	next;
174	TIFFCodec*	info;
175} codec_t;
176static	codec_t* registeredCODECS = NULL;
177
178const TIFFCodec*
179TIFFFindCODEC(uint16 scheme)
180{
181	const TIFFCodec* c;
182	codec_t* cd;
183
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)
189			return (c);
190	return ((const TIFFCodec*) 0);
191}
192
193TIFFCodec*
194TIFFRegisterCODEC(uint16 scheme, const char* name, TIFFInitMethod init)
195{
196	codec_t* cd = (codec_t*)
197	    _TIFFmalloc(sizeof (codec_t) + sizeof (TIFFCodec) + strlen(name)+1);
198
199	if (cd != NULL) {
200		char *temp;
201		cd->info = (TIFFCodec*) ((tidata_t) cd + sizeof (codec_t));
202		temp = (char*)
203		    ((tidata_t) cd->info + sizeof (TIFFCodec));
204		strcpy(temp, name);
205		cd->info->name = temp;
206		cd->info->scheme = scheme;
207		cd->info->init = init;
208		cd->next = registeredCODECS;
209		registeredCODECS = cd;
210	} else {
211		TIFFErrorExt(0, "TIFFRegisterCODEC",
212		    "No space to register compression scheme %s", name);
213		return NULL;
214	}
215	return (cd->info);
216}
217
218void
219TIFFUnRegisterCODEC(TIFFCodec* c)
220{
221	codec_t* cd;
222	codec_t** pcd;
223
224	for (pcd = &registeredCODECS; (cd = *pcd); pcd = &cd->next)
225		if (cd->info == c) {
226			*pcd = cd->next;
227			_TIFFfree(cd);
228			return;
229		}
230	TIFFErrorExt(0, "TIFFUnRegisterCODEC",
231	    "Cannot remove compression scheme %s; not registered", c->name);
232}
233
234/************************************************************************/
235/*                       TIFFGetConfisuredCODECs()                      */
236/************************************************************************/
237
238/**
239 * Get list of configured codecs, both built-in and registered by user.
240 * Caller is responsible to free this structure.
241 *
242 * @return returns array of TIFFCodec records (the last record should be NULL)
243 * or NULL if function failed.
244 */
245
246TIFFCodec*
247TIFFGetConfiguredCODECs()
248{
249	int		i = 1;
250        codec_t		*cd;
251        const TIFFCodec	*c;
252	TIFFCodec	*codecs = NULL, *new_codecs;
253
254        for (cd = registeredCODECS; cd; cd = cd->next) {
255                new_codecs = (TIFFCodec *)
256			_TIFFrealloc(codecs, i * sizeof(TIFFCodec));
257		if (!new_codecs) {
258			_TIFFfree (codecs);
259			return NULL;
260		}
261		codecs = new_codecs;
262		_TIFFmemcpy(codecs + i - 1, cd, sizeof(TIFFCodec));
263		i++;
264	}
265        for (c = _TIFFBuiltinCODECS; c->name; c++) {
266                if (TIFFIsCODECConfigured(c->scheme)) {
267                        new_codecs = (TIFFCodec *)
268				_TIFFrealloc(codecs, i * sizeof(TIFFCodec));
269			if (!new_codecs) {
270				_TIFFfree (codecs);
271				return NULL;
272			}
273			codecs = new_codecs;
274			_TIFFmemcpy(codecs + i - 1, (const tdata_t)c, sizeof(TIFFCodec));
275			i++;
276		}
277	}
278
279	new_codecs = (TIFFCodec *) _TIFFrealloc(codecs, i * sizeof(TIFFCodec));
280	if (!new_codecs) {
281		_TIFFfree (codecs);
282		return NULL;
283	}
284	codecs = new_codecs;
285	_TIFFmemset(codecs + i - 1, 0, sizeof(TIFFCodec));
286
287        return codecs;
288}
289
290/* vim: set ts=8 sts=8 sw=8 noet: */
291/*
292 * Local Variables:
293 * mode: c
294 * c-basic-offset: 8
295 * fill-column: 78
296 * End:
297 */
298