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- /*
- * Copyright (c) 1988-1997 Sam Leffler
- * Copyright (c) 1991-1997 Silicon Graphics, Inc.
- *
- * Permission to use, copy, modify, distribute, and sell this software and
- * its documentation for any purpose is hereby granted without fee, provided
- * that (i) the above copyright notices and this permission notice appear in
- * all copies of the software and related documentation, and (ii) the names of
- * Sam Leffler and Silicon Graphics may not be used in any advertising or
- * publicity relating to the software without the specific, prior written
- * permission of Sam Leffler and Silicon Graphics.
- *
- * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
- * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
- *
- * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
- * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
- * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
- * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
- * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
- * OF THIS SOFTWARE.
- */
-
- /*
- * TIFF Library
- *
- * Compression Scheme Configuration Support.
- */
-
- /* $Id: tif_compress.c,v 1.5 2001/03/21 17:16:25 rjs Exp $ */
-
- #include "tiffiop.h"
-
- static int
- TIFFNoDecode(TIFF* tif, char* method)
- {
- const TIFFCodec* c = TIFFFindCODEC(tif->tif_dir.td_compression);
-
- if (c)
- TIFFError(tif->tif_name, "%s %s decoding is not implemented",
- c->name, method);
- else
- TIFFError(tif->tif_name,
- "Compression scheme %u %s decoding is not implemented",
- tif->tif_dir.td_compression, method);
- return (-1);
- }
-
- int
- _TIFFNoRowDecode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)
- {
- (void) pp; (void) cc; (void) s;
- return (TIFFNoDecode(tif, "scanline"));
- }
-
- int
- _TIFFNoStripDecode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)
- {
- (void) pp; (void) cc; (void) s;
- return (TIFFNoDecode(tif, "strip"));
- }
-
- int
- _TIFFNoTileDecode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)
- {
- (void) pp; (void) cc; (void) s;
- return (TIFFNoDecode(tif, "tile"));
- }
-
- int
- _TIFFNoSeek(TIFF* tif, uint32 off)
- {
- (void) off;
- TIFFError(tif->tif_name,
- "Compression algorithm does not support random access");
- return (0);
- }
-
- int
- _TIFFNoPreCode(TIFF* tif, tsample_t s)
- {
- (void) tif; (void) s;
- return (1);
- }
-
- static int _TIFFtrue(TIFF* tif) { (void) tif; return (1); }
- static void _TIFFvoid(TIFF* tif) { (void) tif; }
-
- void
- _TIFFSetDefaultCompressionState(TIFF* tif)
- {
- tif->tif_setupdecode = _TIFFtrue;
- tif->tif_predecode = _TIFFNoPreCode;
- tif->tif_decoderow = _TIFFNoRowDecode;
- tif->tif_decodestrip = _TIFFNoStripDecode;
- tif->tif_decodetile = _TIFFNoTileDecode;
- tif->tif_setupencode = _TIFFtrue;
- tif->tif_preencode = _TIFFNoPreCode;
- tif->tif_postencode = _TIFFtrue;
- tif->tif_close = _TIFFvoid;
- tif->tif_seek = _TIFFNoSeek;
- tif->tif_cleanup = _TIFFvoid;
- tif->tif_defstripsize = _TIFFDefaultStripSize;
- tif->tif_deftilesize = _TIFFDefaultTileSize;
- tif->tif_flags &= ~TIFF_NOBITREV;
- }
-
- int
- TIFFSetCompressionScheme(TIFF* tif, int scheme)
- {
- const TIFFCodec *c = TIFFFindCODEC((uint16) scheme);
-
- _TIFFSetDefaultCompressionState(tif);
- /*
- * Don't treat an unknown compression scheme as an error.
- * This permits applications to open files with data that
- * the library does not have builtin support for, but which
- * may still be meaningful.
- */
- return (c ? (*c->init)(tif, scheme) : 1);
- }
-
- /*
- * Other compression schemes may be registered. Registered
- * schemes can also override the builtin versions provided
- * by this library.
- */
- typedef struct _codec {
- struct _codec* next;
- TIFFCodec* info;
- } codec_t;
- static codec_t* registeredCODECS = NULL;
-
- const TIFFCodec*
- TIFFFindCODEC(uint16 scheme)
- {
- const TIFFCodec* c;
- codec_t* cd;
-
- for (cd = registeredCODECS; cd; cd = cd->next)
- if (cd->info->scheme == scheme)
- return ((const TIFFCodec*) cd->info);
- for (c = _TIFFBuiltinCODECS; c->name; c++)
- if (c->scheme == scheme)
- return (c);
- return ((const TIFFCodec*) 0);
- }
-