/*

 * 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)

    {

        TIFFErrorExtR(tif, tif->tif_name, "%s %s encoding is not implemented",

                      c->name, method);

    }

    else

    {

        TIFFErrorExtR(tif, tif->tif_name,

                      "Compression scheme %" PRIu16

                      " %s encoding is not implemented",

                      tif->tif_dir.td_compression, method);

    }

    return (-1);

}

int _TIFFNoRowEncode(TIFF *tif, uint8_t *pp, tmsize_t cc, uint16_t s)

{

    (void)pp;

    (void)cc;

    (void)s;

    return (TIFFNoEncode(tif, "scanline"));

}

int _TIFFNoStripEncode(TIFF *tif, uint8_t *pp, tmsize_t cc, uint16_t s)

{

    (void)pp;

    (void)cc;

    (void)s;

    return (TIFFNoEncode(tif, "strip"));

}

int _TIFFNoTileEncode(TIFF *tif, uint8_t *pp, tmsize_t cc, uint16_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)

        TIFFErrorExtR(tif, tif->tif_name, "%s %s decoding is not implemented",

                      c->name, method);

    else

        TIFFErrorExtR(tif, tif->tif_name,

                      "Compression scheme %" PRIu16

                      " %s decoding is not implemented",

                      tif->tif_dir.td_compression, method);

    return (0);

}

static int _TIFFNoFixupTags(TIFF *tif)

{

    (void)tif;

    return (1);

}

int _TIFFNoRowDecode(TIFF *tif, uint8_t *pp, tmsize_t cc, uint16_t s)

{

    (void)pp;

    (void)cc;

    (void)s;

    return (TIFFNoDecode(tif, "scanline"));

}

int _TIFFNoStripDecode(TIFF *tif, uint8_t *pp, tmsize_t cc, uint16_t s)

{

    (void)pp;

    (void)cc;

    (void)s;

    return (TIFFNoDecode(tif, "strip"));

}

int _TIFFNoTileDecode(TIFF *tif, uint8_t *pp, tmsize_t cc, uint16_t s)

{

    (void)pp;

    (void)cc;

    (void)s;

    return (TIFFNoDecode(tif, "tile"));

}

int _TIFFNoSeek(TIFF *tif, uint32_t off)

{

    (void)off;

    TIFFErrorExtR(tif, tif->tif_name,

                  "Compression algorithm does not support random access");

    return (0);

}

int _TIFFNoPreCode(TIFF *tif, uint16_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_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_t)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_t 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_t scheme, const char *name,

                             TIFFInitMethod init)

{

    codec_t *cd = (codec_t *)_TIFFmallocExt(

        NULL,

        (tmsize_t)(sizeof(codec_t) + sizeof(TIFFCodec) + strlen(name) + 1));

    if (cd != NULL)

    {

        char *codec_name;

        cd->info = (TIFFCodec *)((uint8_t *)cd + sizeof(codec_t));

        codec_name = (char *)((uint8_t *)cd->info + sizeof(TIFFCodec));

        strcpy(codec_name, name);

        cd->info->name = codec_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) != NULL; pcd = &cd->next)

        if (cd->info == c)

        {

            *pcd = cd->next;

            _TIFFfreeExt(NULL, cd);

            return;

        }

    TIFFErrorExt(0, "TIFFUnRegisterCODEC",

                 "Cannot remove compression scheme %s; not registered",

                 c->name);

}

/************************************************************************/

/*                       TIFFGetConfiguredCODECs()                      */

/************************************************************************/

/**

 * 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(void)

{

    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 *)_TIFFreallocExt(NULL, codecs, i * sizeof(TIFFCodec));

        if (!new_codecs)

        {

            _TIFFfreeExt(NULL, codecs);

            return NULL;

        }

        codecs = new_codecs;

        _TIFFmemcpy(codecs + i - 1, cd->info, sizeof(TIFFCodec));

        i++;

    }

    for (c = _TIFFBuiltinCODECS; c->name; c++)

    {

        if (TIFFIsCODECConfigured(c->scheme))

        {

            new_codecs = (TIFFCodec *)_TIFFreallocExt(NULL, codecs,

                                                      i * sizeof(TIFFCodec));

            if (!new_codecs)

            {

                _TIFFfreeExt(NULL, codecs);

                return NULL;

            }

            codecs = new_codecs;

            _TIFFmemcpy(codecs + i - 1, (const void *)c, sizeof(TIFFCodec));

            i++;

        }

    }

    new_codecs =

        (TIFFCodec *)_TIFFreallocExt(NULL, codecs, i * sizeof(TIFFCodec));

    if (!new_codecs)

    {

        _TIFFfreeExt(NULL, codecs);

        return NULL;

    }

    codecs = new_codecs;

    _TIFFmemset(codecs + i - 1, 0, sizeof(TIFFCodec));

    return codecs;

}