434 lines
6.4 KiB
C
434 lines
6.4 KiB
C
/* $Header: /roq/tiff/tif_compress.c 1 11/02/99 4:39p Zaphod $ */
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/*
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* Copyright (c) 1988-1996 Sam Leffler
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* Copyright (c) 1991-1996 Silicon Graphics, Inc.
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*
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* Permission to use, copy, modify, distribute, and sell this software and
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* its documentation for any purpose is hereby granted without fee, provided
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* that (i) the above copyright notices and this permission notice appear in
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* all copies of the software and related documentation, and (ii) the names of
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* Sam Leffler and Silicon Graphics may not be used in any advertising or
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* publicity relating to the software without the specific, prior written
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* permission of Sam Leffler and Silicon Graphics.
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*
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* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
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* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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*
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* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
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* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
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* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
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* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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/*
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* TIFF Library
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*
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* Compression Scheme Configuration Support.
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*/
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#include "tiffiop.h"
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static int
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TIFFNoEncode(TIFF* tif, char* method)
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{
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const TIFFCodec* c = TIFFFindCODEC(tif->tif_dir.td_compression);
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if (c)
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TIFFError(tif->tif_name, "%s %s encoding is not implemented",
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c->name, method);
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else
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TIFFError(tif->tif_name,
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"Compression scheme %u %s encoding is not implemented",
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tif->tif_dir.td_compression, method);
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return (-1);
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}
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int
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_TIFFNoRowEncode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)
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{
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(void) pp; (void) cc; (void) s;
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return (TIFFNoEncode(tif, "scanline"));
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}
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int
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_TIFFNoStripEncode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)
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{
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(void) pp; (void) cc; (void) s;
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return (TIFFNoEncode(tif, "strip"));
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}
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int
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_TIFFNoTileEncode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)
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{
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(void) pp; (void) cc; (void) s;
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return (TIFFNoEncode(tif, "tile"));
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}
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static int
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TIFFNoDecode(TIFF* tif, char* method)
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{
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const TIFFCodec* c = TIFFFindCODEC(tif->tif_dir.td_compression);
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if (c)
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TIFFError(tif->tif_name, "%s %s decoding is not implemented",
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c->name, method);
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else
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TIFFError(tif->tif_name,
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"Compression scheme %u %s decoding is not implemented",
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tif->tif_dir.td_compression, method);
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return (-1);
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}
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int
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_TIFFNoRowDecode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)
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{
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(void) pp; (void) cc; (void) s;
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return (TIFFNoDecode(tif, "scanline"));
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}
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int
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_TIFFNoStripDecode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)
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{
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(void) pp; (void) cc; (void) s;
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return (TIFFNoDecode(tif, "strip"));
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}
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int
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_TIFFNoTileDecode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)
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{
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(void) pp; (void) cc; (void) s;
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return (TIFFNoDecode(tif, "tile"));
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}
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int
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_TIFFNoSeek(TIFF* tif, uint32 off)
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{
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(void) off;
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TIFFError(tif->tif_name,
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"Compression algorithm does not support random access");
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return (0);
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}
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int
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_TIFFNoPreCode(TIFF* tif, tsample_t s)
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{
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(void) tif; (void) s;
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return (1);
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}
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static int _TIFFtrue(TIFF* tif) { (void) tif; return (1); }
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static void _TIFFvoid(TIFF* tif) { (void) tif; }
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int
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TIFFSetCompressionScheme(TIFF* tif, int scheme)
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{
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const TIFFCodec *c = TIFFFindCODEC(scheme);
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tif->tif_setupdecode = _TIFFtrue;
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tif->tif_predecode = _TIFFNoPreCode;
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tif->tif_decoderow = _TIFFNoRowDecode;
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tif->tif_decodestrip = _TIFFNoStripDecode;
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tif->tif_decodetile = _TIFFNoTileDecode;
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tif->tif_setupencode = _TIFFtrue;
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tif->tif_preencode = _TIFFNoPreCode;
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tif->tif_postencode = _TIFFtrue;
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tif->tif_encoderow = _TIFFNoRowEncode;
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tif->tif_encodestrip = _TIFFNoStripEncode;
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tif->tif_encodetile = _TIFFNoTileEncode;
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tif->tif_close = _TIFFvoid;
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tif->tif_seek = _TIFFNoSeek;
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tif->tif_cleanup = _TIFFvoid;
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tif->tif_defstripsize = _TIFFDefaultStripSize;
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tif->tif_deftilesize = _TIFFDefaultTileSize;
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tif->tif_flags &= ~TIFF_NOBITREV;
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/*
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* Don't treat an unknown compression scheme as an error.
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* This permits applications to open files with data that
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* the library does not have builtin support for, but which
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* may still be meaningful.
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*/
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return (c ? (*c->init)(tif, scheme) : 1);
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}
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/*
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* Other compression schemes may be registered. Registered
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* schemes can also override the builtin versions provided
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* by this library.
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*/
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typedef struct _codec {
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struct _codec* next;
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TIFFCodec* info;
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} codec_t;
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static codec_t* registeredCODECS = NULL;
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const TIFFCodec*
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TIFFFindCODEC(uint16 scheme)
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{
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const TIFFCodec* c;
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codec_t* cd;
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for (cd = registeredCODECS; cd; cd = cd->next)
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if (cd->info->scheme == scheme)
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return ((const TIFFCodec*) cd->info);
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for (c = _TIFFBuiltinCODECS; c->name; c++)
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if (c->scheme == scheme)
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return (c);
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return ((const TIFFCodec*) 0);
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}
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TIFFCodec*
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TIFFRegisterCODEC(uint16 scheme, const char* name, TIFFInitMethod init)
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{
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codec_t* cd = (codec_t*)
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_TIFFmalloc(sizeof (codec_t) + sizeof (TIFFCodec) + strlen(name)+1);
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if (cd != NULL) {
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cd->info = (TIFFCodec*) ((tidata_t) cd + sizeof (codec_t));
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cd->info->name = (char*)
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((tidata_t) cd->info + sizeof (TIFFCodec));
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strcpy(cd->info->name, name);
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cd->info->scheme = scheme;
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cd->info->init = init;
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cd->next = registeredCODECS;
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registeredCODECS = cd;
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} else
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TIFFError("TIFFRegisterCODEC",
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"No space to register compression scheme %s", name);
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return (cd->info);
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}
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void
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TIFFUnRegisterCODEC(TIFFCodec* c)
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{
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codec_t* cd;
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codec_t** pcd;
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for (pcd = ®isteredCODECS; (cd = *pcd); pcd = &cd->next)
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if (cd->info == c) {
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*pcd = cd->next;
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_TIFFfree(cd);
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return;
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}
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TIFFError("TIFFUnRegisterCODEC",
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"Cannot remove compression scheme %s; not registered", c->name);
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}
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