305 lines
8.4 KiB
C
305 lines
8.4 KiB
C
/* $Id: tif_compress.c,v 1.22 2010-03-10 18:56:48 bfriesen Exp $ */
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/*
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* Copyright (c) 1988-1997 Sam Leffler
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* Copyright (c) 1991-1997 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, const 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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TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
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"%s %s encoding is not implemented",
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c->name, method);
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} else {
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TIFFErrorExt(tif->tif_clientdata, 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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}
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return (-1);
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}
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int
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_TIFFNoRowEncode(TIFF* tif, uint8* pp, tmsize_t cc, uint16 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, uint8* pp, tmsize_t cc, uint16 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, uint8* pp, tmsize_t cc, uint16 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, const 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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TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
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"%s %s decoding is not implemented",
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c->name, method);
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else
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TIFFErrorExt(tif->tif_clientdata, 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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_TIFFNoFixupTags(TIFF* tif)
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{
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(void) tif;
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return (1);
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}
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int
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_TIFFNoRowDecode(TIFF* tif, uint8* pp, tmsize_t cc, uint16 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, uint8* pp, tmsize_t cc, uint16 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, uint8* pp, tmsize_t cc, uint16 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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TIFFErrorExt(tif->tif_clientdata, 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, uint16 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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void
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_TIFFSetDefaultCompressionState(TIFF* tif)
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{
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tif->tif_fixuptags = _TIFFNoFixupTags;
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tif->tif_decodestatus = TRUE;
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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_encodestatus = TRUE;
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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|TIFF_NOREADRAW);
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}
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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((uint16) scheme);
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_TIFFSetDefaultCompressionState(tif);
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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((tmsize_t)(sizeof (codec_t) + sizeof (TIFFCodec) + strlen(name)+1));
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if (cd != NULL) {
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cd->info = (TIFFCodec*) ((uint8*) cd + sizeof (codec_t));
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cd->info->name = (char*)
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((uint8*) 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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TIFFErrorExt(0, "TIFFRegisterCODEC",
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"No space to register compression scheme %s", name);
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return NULL;
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}
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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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TIFFErrorExt(0, "TIFFUnRegisterCODEC",
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"Cannot remove compression scheme %s; not registered", c->name);
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}
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/************************************************************************/
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/* TIFFGetConfisuredCODECs() */
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/************************************************************************/
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/**
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* Get list of configured codecs, both built-in and registered by user.
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* Caller is responsible to free this structure.
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*
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* @return returns array of TIFFCodec records (the last record should be NULL)
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* or NULL if function failed.
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*/
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TIFFCodec*
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TIFFGetConfiguredCODECs()
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{
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int i = 1;
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codec_t *cd;
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const TIFFCodec* c;
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TIFFCodec* codecs = NULL;
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TIFFCodec* new_codecs;
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for (cd = registeredCODECS; cd; cd = cd->next) {
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new_codecs = (TIFFCodec *)
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_TIFFrealloc(codecs, i * sizeof(TIFFCodec));
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if (!new_codecs) {
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_TIFFfree (codecs);
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return NULL;
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}
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codecs = new_codecs;
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_TIFFmemcpy(codecs + i - 1, cd, sizeof(TIFFCodec));
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i++;
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}
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for (c = _TIFFBuiltinCODECS; c->name; c++) {
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if (TIFFIsCODECConfigured(c->scheme)) {
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new_codecs = (TIFFCodec *)
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_TIFFrealloc(codecs, i * sizeof(TIFFCodec));
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if (!new_codecs) {
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_TIFFfree (codecs);
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return NULL;
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}
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codecs = new_codecs;
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_TIFFmemcpy(codecs + i - 1, (const void*)c, sizeof(TIFFCodec));
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i++;
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}
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}
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new_codecs = (TIFFCodec *) _TIFFrealloc(codecs, i * sizeof(TIFFCodec));
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if (!new_codecs) {
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_TIFFfree (codecs);
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return NULL;
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}
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codecs = new_codecs;
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_TIFFmemset(codecs + i - 1, 0, sizeof(TIFFCodec));
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return codecs;
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}
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/* vim: set ts=8 sts=8 sw=8 noet: */
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/*
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* Local Variables:
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* mode: c
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* c-basic-offset: 8
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* fill-column: 78
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* End:
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*/
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