/* $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 = &registeredCODECS; (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:

*/