/* $Id: tif_compress.c,v 1.22 2010-03-10 18:56:48 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, uint8* pp, tmsize_t cc, uint16 s)
{
(void) pp; (void) cc; (void) s;
return (TIFFNoEncode(tif, "scanline"));
}
int
_TIFFNoStripEncode(TIFF* tif, uint8* pp, tmsize_t cc, uint16 s)
{
(void) pp; (void) cc; (void) s;
return (TIFFNoEncode(tif, "strip"));
}
int
_TIFFNoTileEncode(TIFF* tif, uint8* pp, tmsize_t cc, uint16 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
_TIFFNoFixupTags(TIFF* tif)
{
(void) tif;
return (1);
}
int
_TIFFNoRowDecode(TIFF* tif, uint8* pp, tmsize_t cc, uint16 s)
{
(void) pp; (void) cc; (void) s;
return (TIFFNoDecode(tif, "scanline"));
}
int
_TIFFNoStripDecode(TIFF* tif, uint8* pp, tmsize_t cc, uint16 s)
{
(void) pp; (void) cc; (void) s;
return (TIFFNoDecode(tif, "strip"));
}
int
_TIFFNoTileDecode(TIFF* tif, uint8* pp, tmsize_t cc, uint16 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, uint16 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_fixuptags = _TIFFNoFixupTags;
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((tmsize_t)(sizeof (codec_t) + sizeof (TIFFCodec) + strlen(name)+1));
if (cd != NULL) {
cd->info = (TIFFCodec*) ((uint8*) cd + sizeof (codec_t));
cd->info->name = (char*)
((uint8*) 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;
TIFFCodec* 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 void*)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:
*/