/*

 * Copyright (c) 2010, Andrey Kiselev <dron@ak4719.spb.edu>

 *

 * 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.

 */

#include "tiffiop.h"

#ifdef LZMA_SUPPORT

/*

 * TIFF Library.

 *

 * LZMA2 Compression Support

 *

 * You need an LZMA2 SDK to link with. See http://tukaani.org/xz/ for details.

 *

 * The codec is derived from ZLIB codec (tif_zip.c).

 */

#include "lzma.h"

#include "tif_predict.h"

#include <stdio.h>

/*

 * State block for each open TIFF file using LZMA2 compression/decompression.

 */

typedef struct

{

    TIFFPredictorState predict;

    int read_error; /* whether a read error has occurred, and which should cause

                       further reads in the same strip/tile to be aborted */

    lzma_stream stream;

    lzma_filter filters[LZMA_FILTERS_MAX + 1];

    lzma_options_delta opt_delta; /* delta filter options */

    lzma_options_lzma opt_lzma;   /* LZMA2 filter options */

    int preset;                   /* compression level */

    lzma_check check;             /* type of the integrity check */

    int state;                    /* state flags */

#define LSTATE_INIT_DECODE 0x01

#define LSTATE_INIT_ENCODE 0x02

    TIFFVGetMethod vgetparent; /* super-class method */

    TIFFVSetMethod vsetparent; /* super-class method */

} LZMAState;

#define GetLZMAState(tif) ((LZMAState *)(tif)->tif_data)

#define LZMADecoderState(tif) GetLZMAState(tif)

#define LZMAEncoderState(tif) GetLZMAState(tif)

static int LZMAEncode(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s);

static int LZMADecode(TIFF *tif, uint8_t *op, tmsize_t occ, uint16_t s);

static const char *LZMAStrerror(lzma_ret ret)

{

    switch (ret)

    {

        case LZMA_OK:

            return "operation completed successfully";

        case LZMA_STREAM_END:

            return "end of stream was reached";

        case LZMA_NO_CHECK:

            return "input stream has no integrity check";

        case LZMA_UNSUPPORTED_CHECK:

            return "cannot calculate the integrity check";

        case LZMA_GET_CHECK:

            return "integrity check type is now available";

        case LZMA_MEM_ERROR:

            return "cannot allocate memory";

        case LZMA_MEMLIMIT_ERROR:

            return "memory usage limit was reached";

        case LZMA_FORMAT_ERROR:

            return "file format not recognized";

        case LZMA_OPTIONS_ERROR:

            return "invalid or unsupported options";

        case LZMA_DATA_ERROR:

            return "data is corrupt";

        case LZMA_BUF_ERROR:

            return "no progress is possible (stream is truncated or corrupt)";

        case LZMA_PROG_ERROR:

            return "programming error";

        default:

            return "unidentified liblzma error";

    }

}

static int LZMAFixupTags(TIFF *tif)

{

    (void)tif;

    return 1;

}

static int LZMASetupDecode(TIFF *tif)

{

    LZMAState *sp = LZMADecoderState(tif);

    assert(sp != NULL);

    /* if we were last encoding, terminate this mode */

    if (sp->state & LSTATE_INIT_ENCODE)

    {

        lzma_end(&sp->stream);

        sp->state = 0;

    }

    sp->state |= LSTATE_INIT_DECODE;

    return 1;

}

/*

 * Setup state for decoding a strip.

 */

static int LZMAPreDecode(TIFF *tif, uint16_t s)

{

    static const char module[] = "LZMAPreDecode";

    LZMAState *sp = LZMADecoderState(tif);

    lzma_ret ret;

    (void)s;

    assert(sp != NULL);

    if ((sp->state & LSTATE_INIT_DECODE) == 0)

        tif->tif_setupdecode(tif);

    sp->stream.next_in = tif->tif_rawdata;

    sp->stream.avail_in = (size_t)tif->tif_rawcc;

    if ((tmsize_t)sp->stream.avail_in != tif->tif_rawcc)

    {

        TIFFErrorExtR(tif, module,

                      "Liblzma cannot deal with buffers this size");

        return 0;

    }

    /*

     * Disable memory limit when decoding. UINT64_MAX is a flag to disable

     * the limit, we are passing (uint64_t)-1 which should be the same.

     */

    ret = lzma_stream_decoder(&sp->stream, (uint64_t)-1, 0);

    if (ret != LZMA_OK)

    {

        TIFFErrorExtR(tif, module, "Error initializing the stream decoder, %s",

                      LZMAStrerror(ret));

        return 0;

    }

    sp->read_error = 0;

    return 1;

}

static int LZMADecode(TIFF *tif, uint8_t *op, tmsize_t occ, uint16_t s)

{

    static const char module[] = "LZMADecode";

    LZMAState *sp = LZMADecoderState(tif);

    (void)s;

    assert(sp != NULL);

    assert(sp->state == LSTATE_INIT_DECODE);

    if (sp->read_error)

    {

        memset(op, 0, (size_t)occ);

        TIFFErrorExtR(tif, module,

                      "LZMADecode: Scanline %" PRIu32 " cannot be read due to "

                      "previous error",

                      tif->tif_row);

        return 0;

    }

    sp->stream.next_in = tif->tif_rawcp;

    sp->stream.avail_in = (size_t)tif->tif_rawcc;

    sp->stream.next_out = op;

    sp->stream.avail_out = (size_t)occ;

    if ((tmsize_t)sp->stream.avail_out != occ)

    {

        // read_error not set here as this is a usage issue that can be

        // recovered in a following call.

        memset(op, 0, (size_t)occ);

        TIFFErrorExtR(tif, module,

                      "Liblzma cannot deal with buffers this size");

        return 0;

    }

    do

    {

        /*

         * Save the current stream state to properly recover from the

         * decoding errors later.

         */

        const uint8_t *next_in = sp->stream.next_in;

        size_t avail_in = sp->stream.avail_in;

        lzma_ret ret = lzma_code(&sp->stream, LZMA_RUN);

        if (ret == LZMA_STREAM_END)

            break;

        if (ret == LZMA_MEMLIMIT_ERROR)

        {

            lzma_ret r =

                lzma_stream_decoder(&sp->stream, lzma_memusage(&sp->stream), 0);

            if (r != LZMA_OK)

            {

                sp->read_error = 1;

                memset(op, 0, (size_t)occ);

                TIFFErrorExtR(tif, module,

                              "Error initializing the stream decoder, %s",

                              LZMAStrerror(r));

                break;

            }

            sp->stream.next_in = next_in;

            sp->stream.avail_in = avail_in;

            continue;

        }

        if (ret != LZMA_OK)

        {

            TIFFErrorExtR(tif, module,

                          "Decoding error at scanline %" PRIu32 ", %s",

                          tif->tif_row, LZMAStrerror(ret));

            break;

        }

    } while (sp->stream.avail_out > 0);

    if (sp->stream.avail_out != 0)

    {

        sp->read_error = 1;

        memset(sp->stream.next_out, 0, sp->stream.avail_out);

        TIFFErrorExtR(tif, module,

                      "Not enough data at scanline %" PRIu32

                      " (short %" TIFF_SIZE_FORMAT " bytes)",

                      tif->tif_row, sp->stream.avail_out);

        return 0;

    }

    tif->tif_rawcp = (uint8_t *)sp->stream.next_in; /* cast away const */

    tif->tif_rawcc = sp->stream.avail_in;

    return 1;

}

static int LZMASetupEncode(TIFF *tif)

{

    LZMAState *sp = LZMAEncoderState(tif);

    assert(sp != NULL);

    if (sp->state & LSTATE_INIT_DECODE)

    {

        lzma_end(&sp->stream);

        sp->state = 0;

    }

    sp->state |= LSTATE_INIT_ENCODE;

    return 1;

}

/*

 * Reset encoding state at the start of a strip.

 */

static int LZMAPreEncode(TIFF *tif, uint16_t s)

{

    static const char module[] = "LZMAPreEncode";

    LZMAState *sp = LZMAEncoderState(tif);

    lzma_ret ret;

    (void)s;

    assert(sp != NULL);

    if (sp->state != LSTATE_INIT_ENCODE)

        tif->tif_setupencode(tif);

    sp->stream.next_out = tif->tif_rawdata;

    sp->stream.avail_out = (size_t)tif->tif_rawdatasize;

    if ((tmsize_t)sp->stream.avail_out != tif->tif_rawdatasize)

    {

        TIFFErrorExtR(tif, module,

                      "Liblzma cannot deal with buffers this size");

        return 0;

    }

    ret = lzma_stream_encoder(&sp->stream, sp->filters, sp->check);

    if (ret != LZMA_OK)

    {

        TIFFErrorExtR(tif, module, "Error in lzma_stream_encoder(): %s",

                      LZMAStrerror(ret));

        return 0;

    }

    return 1;

}

/*

 * Encode a chunk of pixels.

 */

static int LZMAEncode(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)

{

    static const char module[] = "LZMAEncode";

    LZMAState *sp = LZMAEncoderState(tif);

    assert(sp != NULL);

    assert(sp->state == LSTATE_INIT_ENCODE);

    (void)s;

    sp->stream.next_in = bp;

    sp->stream.avail_in = (size_t)cc;

    if ((tmsize_t)sp->stream.avail_in != cc)

    {

        TIFFErrorExtR(tif, module,

                      "Liblzma cannot deal with buffers this size");

        return 0;

    }

    do

    {

        lzma_ret ret = lzma_code(&sp->stream, LZMA_RUN);

        if (ret != LZMA_OK)

        {

            TIFFErrorExtR(tif, module,

                          "Encoding error at scanline %" PRIu32 ", %s",

                          tif->tif_row, LZMAStrerror(ret));

            return 0;

        }

        if (sp->stream.avail_out == 0)

        {

            tif->tif_rawcc = tif->tif_rawdatasize;

            if (!TIFFFlushData1(tif))

                return 0;

            sp->stream.next_out = tif->tif_rawdata;

            sp->stream.avail_out =

                (size_t)

                    tif->tif_rawdatasize; /* this is a safe typecast, as check

                                             is made already in LZMAPreEncode */

        }

    } while (sp->stream.avail_in > 0);

    return 1;

}

/*

 * Finish off an encoded strip by flushing the last

 * string and tacking on an End Of Information code.

 */

static int LZMAPostEncode(TIFF *tif)

{

    static const char module[] = "LZMAPostEncode";

    LZMAState *sp = LZMAEncoderState(tif);

    lzma_ret ret;

    sp->stream.avail_in = 0;

    do

    {

        ret = lzma_code(&sp->stream, LZMA_FINISH);

        switch (ret)

        {

            case LZMA_STREAM_END:

            case LZMA_OK:

                if ((tmsize_t)sp->stream.avail_out != tif->tif_rawdatasize)

                {

                    tif->tif_rawcc =

                        tif->tif_rawdatasize - sp->stream.avail_out;

                    if (!TIFFFlushData1(tif))

                        return 0;

                    sp->stream.next_out = tif->tif_rawdata;

                    sp->stream.avail_out =

                        (size_t)

                            tif->tif_rawdatasize; /* this is a safe typecast, as

                                                     check is made already in

                                                     ZIPPreEncode */

                }

                break;

            default:

                TIFFErrorExtR(tif, module, "Liblzma error: %s",

                              LZMAStrerror(ret));

                return 0;

        }

    } while (ret != LZMA_STREAM_END);

    return 1;

}

static void LZMACleanup(TIFF *tif)

{

    LZMAState *sp = GetLZMAState(tif);

    assert(sp != 0);

    (void)TIFFPredictorCleanup(tif);

    tif->tif_tagmethods.vgetfield = sp->vgetparent;

    tif->tif_tagmethods.vsetfield = sp->vsetparent;

    if (sp->state)

    {

        lzma_end(&sp->stream);

        sp->state = 0;

    }

    _TIFFfreeExt(tif, sp);

    tif->tif_data = NULL;

    _TIFFSetDefaultCompressionState(tif);

}

static int LZMAVSetField(TIFF *tif, uint32_t tag, va_list ap)

{

    static const char module[] = "LZMAVSetField";

    LZMAState *sp = GetLZMAState(tif);

    switch (tag)

    {

        case TIFFTAG_LZMAPRESET:

            sp->preset = (int)va_arg(ap, int);

            lzma_lzma_preset(&sp->opt_lzma, sp->preset);

            if (sp->state & LSTATE_INIT_ENCODE)

            {

                lzma_ret ret =

                    lzma_stream_encoder(&sp->stream, sp->filters, sp->check);

                if (ret != LZMA_OK)

                {

                    TIFFErrorExtR(tif, module, "Liblzma error: %s",

                                  LZMAStrerror(ret));

                }

            }

            return 1;

        default:

            return (*sp->vsetparent)(tif, tag, ap);

    }

    /*NOTREACHED*/

}

static int LZMAVGetField(TIFF *tif, uint32_t tag, va_list ap)

{

    LZMAState *sp = GetLZMAState(tif);

    switch (tag)

    {

        case TIFFTAG_LZMAPRESET:

            *va_arg(ap, int *) = sp->preset;

            break;

        default:

            return (*sp->vgetparent)(tif, tag, ap);

    }

    return 1;

}

static const TIFFField lzmaFields[] = {

    {TIFFTAG_LZMAPRESET, 0, 0, TIFF_ANY, 0, TIFF_SETGET_INT, FIELD_PSEUDO, TRUE,

     FALSE, "LZMA2 Compression Preset", NULL},

};

int TIFFInitLZMA(TIFF *tif, int scheme)

{

    static const char module[] = "TIFFInitLZMA";

    LZMAState *sp;

    lzma_stream tmp_stream = LZMA_STREAM_INIT;

    (void)scheme;

    assert(scheme == COMPRESSION_LZMA);

    /*

     * Merge codec-specific tag information.

     */

    if (!_TIFFMergeFields(tif, lzmaFields, TIFFArrayCount(lzmaFields)))

    {

        TIFFErrorExtR(tif, module, "Merging LZMA2 codec-specific tags failed");

        return 0;

    }

    /*

     * Allocate state block so tag methods have storage to record values.

     */

    tif->tif_data = (uint8_t *)_TIFFmallocExt(tif, sizeof(LZMAState));

    if (tif->tif_data == NULL)

        goto bad;

    sp = GetLZMAState(tif);

    memcpy(&sp->stream, &tmp_stream, sizeof(lzma_stream));

    /*

     * Override parent get/set field methods.

     */

    sp->vgetparent = tif->tif_tagmethods.vgetfield;

    tif->tif_tagmethods.vgetfield = LZMAVGetField; /* hook for codec tags */

    sp->vsetparent = tif->tif_tagmethods.vsetfield;

    tif->tif_tagmethods.vsetfield = LZMAVSetField; /* hook for codec tags */

    /* Default values for codec-specific fields */

    sp->preset = LZMA_PRESET_DEFAULT; /* default comp. level */

    sp->check = LZMA_CHECK_NONE;

    sp->state = 0;

    /* Data filters. So far we are using delta and LZMA2 filters only. */

    sp->opt_delta.type = LZMA_DELTA_TYPE_BYTE;

    /*

     * The sample size in bytes seems to be reasonable distance for delta

     * filter.

     */

    sp->opt_delta.dist = (tif->tif_dir.td_bitspersample % 8)

                             ? 1

                             : tif->tif_dir.td_bitspersample / 8;

    sp->filters[0].id = LZMA_FILTER_DELTA;

    sp->filters[0].options = &sp->opt_delta;

    lzma_lzma_preset(&sp->opt_lzma, sp->preset);

    sp->filters[1].id = LZMA_FILTER_LZMA2;

    sp->filters[1].options = &sp->opt_lzma;

    sp->filters[2].id = LZMA_VLI_UNKNOWN;

    sp->filters[2].options = NULL;

    /*

     * Install codec methods.

     */

    tif->tif_fixuptags = LZMAFixupTags;

    tif->tif_setupdecode = LZMASetupDecode;

    tif->tif_predecode = LZMAPreDecode;

    tif->tif_decoderow = LZMADecode;

    tif->tif_decodestrip = LZMADecode;

    tif->tif_decodetile = LZMADecode;

    tif->tif_setupencode = LZMASetupEncode;

    tif->tif_preencode = LZMAPreEncode;

    tif->tif_postencode = LZMAPostEncode;

    tif->tif_encoderow = LZMAEncode;

    tif->tif_encodestrip = LZMAEncode;

    tif->tif_encodetile = LZMAEncode;

    tif->tif_cleanup = LZMACleanup;

    /*

     * Setup predictor setup.

     */

    (void)TIFFPredictorInit(tif);

    return 1;

bad:

    TIFFErrorExtR(tif, module, "No space for LZMA2 state block");

    return 0;

}

#endif /* LZMA_SUPPORT */