/* $Id: tif_compress.c,v 1.13.2.1 2010-06-08 18:50:41 bfriesen Exp $ */ /* * 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. */ #include "tiffiop.h" static int TIFFNoEncode(TIFF* tif, const char* method) { const TIFFCodec* c = TIFFFindCODEC(tif->tif_dir.td_compression); if (c) { TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "%s %s encoding is not implemented", c->name, method); } else { TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "Compression scheme %u %s encoding is not implemented", tif->tif_dir.td_compression, method); } return (-1); } int _TIFFNoRowEncode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s) { (void) pp; (void) cc; (void) s; return (TIFFNoEncode(tif, "scanline")); } int _TIFFNoStripEncode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s) { (void) pp; (void) cc; (void) s; return (TIFFNoEncode(tif, "strip")); } int _TIFFNoTileEncode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s) { (void) pp; (void) cc; (void) s; return (TIFFNoEncode(tif, "tile")); } static int TIFFNoDecode(TIFF* tif, const char* method) { const TIFFCodec* c = TIFFFindCODEC(tif->tif_dir.td_compression); if (c) TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "%s %s decoding is not implemented", c->name, method); else TIFFErrorExt(tif->tif_clientdata, 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; TIFFErrorExt(tif->tif_clientdata, 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_decodestatus = TRUE; tif->tif_setupdecode = _TIFFtrue; tif->tif_predecode = _TIFFNoPreCode; tif->tif_decoderow = _TIFFNoRowDecode; tif->tif_decodestrip = _TIFFNoStripDecode; tif->tif_decodetile = _TIFFNoTileDecode; tif->tif_encodestatus = TRUE; tif->tif_setupencode = _TIFFtrue; tif->tif_preencode = _TIFFNoPreCode; tif->tif_postencode = _TIFFtrue; tif->tif_encoderow = _TIFFNoRowEncode; tif->tif_encodestrip = _TIFFNoStripEncode; tif->tif_encodetile = _TIFFNoTileEncode; 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|TIFF_NOREADRAW); } 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); } TIFFCodec* TIFFRegisterCODEC(uint16 scheme, const char* name, TIFFInitMethod init) { codec_t* cd = (codec_t*) _TIFFmalloc(sizeof (codec_t) + sizeof (TIFFCodec) + strlen(name)+1); if (cd != NULL) { cd->info = (TIFFCodec*) ((tidata_t) cd + sizeof (codec_t)); cd->info->name = (char*) ((tidata_t) cd->info + sizeof (TIFFCodec)); strcpy(cd->info->name, name); cd->info->scheme = scheme; cd->info->init = init; cd->next = registeredCODECS; registeredCODECS = cd; } else { TIFFErrorExt(0, "TIFFRegisterCODEC", "No space to register compression scheme %s", name); return NULL; } return (cd->info); } void TIFFUnRegisterCODEC(TIFFCodec* c) { codec_t* cd; codec_t** pcd; for (pcd = ®isteredCODECS; (cd = *pcd); pcd = &cd->next) if (cd->info == c) { *pcd = cd->next; _TIFFfree(cd); return; } TIFFErrorExt(0, "TIFFUnRegisterCODEC", "Cannot remove compression scheme %s; not registered", c->name); } /************************************************************************/ /* TIFFGetConfisuredCODECs() */ /************************************************************************/ /** * Get list of configured codecs, both built-in and registered by user. * Caller is responsible to free this structure. * * @return returns array of TIFFCodec records (the last record should be NULL) * or NULL if function failed. */ TIFFCodec* TIFFGetConfiguredCODECs() { int i = 1; codec_t *cd; const TIFFCodec *c; TIFFCodec *codecs = NULL, *new_codecs; for (cd = registeredCODECS; cd; cd = cd->next) { new_codecs = (TIFFCodec *) _TIFFrealloc(codecs, i * sizeof(TIFFCodec)); if (!new_codecs) { _TIFFfree (codecs); return NULL; } codecs = new_codecs; _TIFFmemcpy(codecs + i - 1, cd, sizeof(TIFFCodec)); i++; } for (c = _TIFFBuiltinCODECS; c->name; c++) { if (TIFFIsCODECConfigured(c->scheme)) { new_codecs = (TIFFCodec *) _TIFFrealloc(codecs, i * sizeof(TIFFCodec)); if (!new_codecs) { _TIFFfree (codecs); return NULL; } codecs = new_codecs; _TIFFmemcpy(codecs + i - 1, (const tdata_t)c, sizeof(TIFFCodec)); i++; } } new_codecs = (TIFFCodec *) _TIFFrealloc(codecs, i * sizeof(TIFFCodec)); if (!new_codecs) { _TIFFfree (codecs); return NULL; } codecs = new_codecs; _TIFFmemset(codecs + i - 1, 0, sizeof(TIFFCodec)); return codecs; } /* vim: set ts=8 sts=8 sw=8 noet: */ /* * Local Variables: * mode: c * c-basic-offset: 8 * fill-column: 78 * End: */