/* $Id: tif_zip.c,v 1.31 2011-01-06 16:00:23 fwarmerdam Exp $ */

/*
 * Copyright (c) 1995-1997 Sam Leffler
 * Copyright (c) 1995-1997 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.
 */

#include "tiffiop.h"
#ifdef ZIP_SUPPORT
/*
 * TIFF Library.
 *
 * ZIP (aka Deflate) Compression Support
 *
 * This file is simply an interface to the zlib library written by
 * Jean-loup Gailly and Mark Adler.  You must use version 1.0 or later
 * of the library: this code assumes the 1.0 API and also depends on
 * the ability to write the zlib header multiple times (one per strip)
 * which was not possible with versions prior to 0.95.  Note also that
 * older versions of this codec avoided this bug by supressing the header
 * entirely.  This means that files written with the old library cannot
 * be read; they should be converted to a different compression scheme
 * and then reconverted.
 *
 * The data format used by the zlib library is described in the files
 * zlib-3.1.doc, deflate-1.1.doc and gzip-4.1.doc, available in the
 * directory ftp://ftp.uu.net/pub/archiving/zip/doc.  The library was
 * last found at ftp://ftp.uu.net/pub/archiving/zip/zlib/zlib-0.99.tar.gz.
 */
#include "tif_predict.h"
#include "zlib.h"

#include <stdio.h>

/*
 * Sigh, ZLIB_VERSION is defined as a string so there's no
 * way to do a proper check here.  Instead we guess based
 * on the presence of #defines that were added between the
 * 0.95 and 1.0 distributions.
 */
#if !defined(Z_NO_COMPRESSION) || !defined(Z_DEFLATED)
#error "Antiquated ZLIB software; you must use version 1.0 or later"
#endif

/*
 * State block for each open TIFF
 * file using ZIP compression/decompression.
 */
typedef struct {
    TIFFPredictorState predict;
        z_stream        stream;
    int             zipquality;            /* compression level */
    int             state;                 /* state flags */
#define ZSTATE_INIT_DECODE 0x01
#define ZSTATE_INIT_ENCODE 0x02

    TIFFVGetMethod  vgetparent;            /* super-class method */
    TIFFVSetMethod  vsetparent;            /* super-class method */
} ZIPState;

#define ZState(tif)             ((ZIPState*) (tif)->tif_data)
#define DecoderState(tif)       ZState(tif)
#define EncoderState(tif)       ZState(tif)

static int ZIPEncode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s);
static int ZIPDecode(TIFF* tif, uint8* op, tmsize_t occ, uint16 s);

static int
ZIPFixupTags(TIFF* tif)
{
    (void) tif;
    return (1);
}

static int
ZIPSetupDecode(TIFF* tif)
{
    static const char module[] = "ZIPSetupDecode";
    ZIPState* sp = DecoderState(tif);

    assert(sp != NULL);

        /* if we were last encoding, terminate this mode */
    if (sp->state & ZSTATE_INIT_ENCODE) {
        deflateEnd(&sp->stream);
        sp->state = 0;
    }

    if (inflateInit(&sp->stream) != Z_OK) {
        TIFFErrorExt(tif->tif_clientdata, module, "%s", sp->stream.msg);
        return (0);
    } else {
        sp->state |= ZSTATE_INIT_DECODE;
        return (1);
    }
}

/*
 * Setup state for decoding a strip.
 */
static int
ZIPPreDecode(TIFF* tif, uint16 s)
{
    static const char module[] = "ZIPPreDecode";
    ZIPState* sp = DecoderState(tif);

    (void) s;
    assert(sp != NULL);

    if( (sp->state & ZSTATE_INIT_DECODE) == 0 )
            tif->tif_setupdecode( tif );

    sp->stream.next_in = tif->tif_rawdata;
    assert(sizeof(sp->stream.avail_in)==4);  /* if this assert gets raised,
        we need to simplify this code to reflect a ZLib that is likely updated
        to deal with 8byte memory sizes, though this code will respond
        apropriately even before we simplify it */
    sp->stream.avail_in = (uInt) tif->tif_rawcc;
    if ((tmsize_t)sp->stream.avail_in != tif->tif_rawcc)
    {
        TIFFErrorExt(tif->tif_clientdata, module, "ZLib cannot deal with buffers this size");
        return (0);
    }
    return (inflateReset(&sp->stream) == Z_OK);
}

static int
ZIPDecode(TIFF* tif, uint8* op, tmsize_t occ, uint16 s)
{
    static const char module[] = "ZIPDecode";
    ZIPState* sp = DecoderState(tif);

    (void) s;
    assert(sp != NULL);
    assert(sp->state == ZSTATE_INIT_DECODE);

        sp->stream.next_in = tif->tif_rawcp;
    sp->stream.avail_in = (uInt) tif->tif_rawcc;

    sp->stream.next_out = op;
    assert(sizeof(sp->stream.avail_out)==4);  /* if this assert gets raised,
        we need to simplify this code to reflect a ZLib that is likely updated
        to deal with 8byte memory sizes, though this code will respond
        apropriately even before we simplify it */
    sp->stream.avail_out = (uInt) occ;
    if ((tmsize_t)sp->stream.avail_out != occ)
    {
        TIFFErrorExt(tif->tif_clientdata, module, "ZLib cannot deal with buffers this size");
        return (0);
    }
    do {
        int state = inflate(&sp->stream, Z_PARTIAL_FLUSH);
        if (state == Z_STREAM_END)
            break;
        if (state == Z_DATA_ERROR) {
            TIFFErrorExt(tif->tif_clientdata, module,
                "Decoding error at scanline %lu, %s",
                (unsigned long) tif->tif_row, sp->stream.msg);
            if (inflateSync(&sp->stream) != Z_OK)
                return (0);
            continue;
        }
        if (state != Z_OK) {
            TIFFErrorExt(tif->tif_clientdata, module, "ZLib error: %s",
                sp->stream.msg);
            return (0);
        }
    } while (sp->stream.avail_out > 0);
    if (sp->stream.avail_out != 0) {
        TIFFErrorExt(tif->tif_clientdata, module,
            "Not enough data at scanline %lu (short " TIFF_UINT64_FORMAT " bytes)",
            (unsigned long) tif->tif_row, (TIFF_UINT64_T) sp->stream.avail_out);
        return (0);
    }

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

    return (1);
}

static int
ZIPSetupEncode(TIFF* tif)
{
    static const char module[] = "ZIPSetupEncode";
    ZIPState* sp = EncoderState(tif);

    assert(sp != NULL);
    if (sp->state & ZSTATE_INIT_DECODE) {
        inflateEnd(&sp->stream);
        sp->state = 0;
    }

    if (deflateInit(&sp->stream, sp->zipquality) != Z_OK) {
        TIFFErrorExt(tif->tif_clientdata, module, "%s", sp->stream.msg);
        return (0);
    } else {
        sp->state |= ZSTATE_INIT_ENCODE;
        return (1);
    }
}

/*
 * Reset encoding state at the start of a strip.
 */
static int
ZIPPreEncode(TIFF* tif, uint16 s)
{
    static const char module[] = "ZIPPreEncode";
    ZIPState *sp = EncoderState(tif);

    (void) s;
    assert(sp != NULL);
    if( sp->state != ZSTATE_INIT_ENCODE )
            tif->tif_setupencode( tif );

    sp->stream.next_out = tif->tif_rawdata;
    assert(sizeof(sp->stream.avail_out)==4);  /* if this assert gets raised,
        we need to simplify this code to reflect a ZLib that is likely updated
        to deal with 8byte memory sizes, though this code will respond
        apropriately even before we simplify it */
    sp->stream.avail_out = tif->tif_rawdatasize;
    if ((tmsize_t)sp->stream.avail_out != tif->tif_rawdatasize)
    {
        TIFFErrorExt(tif->tif_clientdata, module, "ZLib cannot deal with buffers this size");
        return (0);
    }
    return (deflateReset(&sp->stream) == Z_OK);
}

/*
 * Encode a chunk of pixels.
 */
static int
ZIPEncode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
{
    static const char module[] = "ZIPEncode";
    ZIPState *sp = EncoderState(tif);

    assert(sp != NULL);
    assert(sp->state == ZSTATE_INIT_ENCODE);

    (void) s;
    sp->stream.next_in = bp;
    assert(sizeof(sp->stream.avail_in)==4);  /* if this assert gets raised,
        we need to simplify this code to reflect a ZLib that is likely updated
        to deal with 8byte memory sizes, though this code will respond
        apropriately even before we simplify it */
    sp->stream.avail_in = (uInt) cc;
    if ((tmsize_t)sp->stream.avail_in != cc)
    {
        TIFFErrorExt(tif->tif_clientdata, module, "ZLib cannot deal with buffers this size");
        return (0);
    }
    do {
        if (deflate(&sp->stream, Z_NO_FLUSH) != Z_OK) {
            TIFFErrorExt(tif->tif_clientdata, module, "Encoder error: %s",
                sp->stream.msg);
            return (0);
        }
        if (sp->stream.avail_out == 0) {
            tif->tif_rawcc = tif->tif_rawdatasize;
            TIFFFlushData1(tif);
            sp->stream.next_out = tif->tif_rawdata;
            sp->stream.avail_out = (uInt) tif->tif_rawdatasize;  /* this is a safe typecast, as check is made already in ZIPPreEncode */
        }
    } 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
ZIPPostEncode(TIFF* tif)
{
    static const char module[] = "ZIPPostEncode";
    ZIPState *sp = EncoderState(tif);
    int state;

    sp->stream.avail_in = 0;
    do {
        state = deflate(&sp->stream, Z_FINISH);
        switch (state) {
        case Z_STREAM_END:
        case Z_OK:
            if ((tmsize_t)sp->stream.avail_out != tif->tif_rawdatasize)
            {
                tif->tif_rawcc =  tif->tif_rawdatasize - sp->stream.avail_out;
                TIFFFlushData1(tif);
                sp->stream.next_out = tif->tif_rawdata;
                sp->stream.avail_out = (uInt) tif->tif_rawdatasize;  /* this is a safe typecast, as check is made already in ZIPPreEncode */
            }
            break;
        default:
            TIFFErrorExt(tif->tif_clientdata, module, "ZLib error: %s",
                sp->stream.msg);
            return (0);
        }
    } while (state != Z_STREAM_END);
    return (1);
}

static void
ZIPCleanup(TIFF* tif)
{
    ZIPState* sp = ZState(tif);

    assert(sp != 0);

    (void)TIFFPredictorCleanup(tif);

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

    if (sp->state & ZSTATE_INIT_ENCODE) {
        deflateEnd(&sp->stream);
        sp->state = 0;
    } else if( sp->state & ZSTATE_INIT_DECODE) {
        inflateEnd(&sp->stream);
        sp->state = 0;
    }
    _TIFFfree(sp);
    tif->tif_data = NULL;

    _TIFFSetDefaultCompressionState(tif);
}

static int
ZIPVSetField(TIFF* tif, uint32 tag, va_list ap)
{
    static const char module[] = "ZIPVSetField";
    ZIPState* sp = ZState(tif);

    switch (tag) {
    case TIFFTAG_ZIPQUALITY:
        sp->zipquality = (int) va_arg(ap, int);
        if ( sp->state&ZSTATE_INIT_ENCODE ) {
            if (deflateParams(&sp->stream,
                sp->zipquality, Z_DEFAULT_STRATEGY) != Z_OK) {
                TIFFErrorExt(tif->tif_clientdata, module, "ZLib error: %s",
                    sp->stream.msg);
                return (0);
            }
        }
        return (1);
    default:
        return (*sp->vsetparent)(tif, tag, ap);
    }
    /*NOTREACHED*/
}

static int
ZIPVGetField(TIFF* tif, uint32 tag, va_list ap)
{
    ZIPState* sp = ZState(tif);

    switch (tag) {
    case TIFFTAG_ZIPQUALITY:
        *va_arg(ap, int*) = sp->zipquality;
        break;
    default:
        return (*sp->vgetparent)(tif, tag, ap);
    }
    return (1);
}

static const TIFFField zipFields[] = {
    { TIFFTAG_ZIPQUALITY, 0, 0, TIFF_ANY, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "", NULL },
};

int
TIFFInitZIP(TIFF* tif, int scheme)
{
    static const char module[] = "TIFFInitZIP";
    ZIPState* sp;

    assert( (scheme == COMPRESSION_DEFLATE)
        || (scheme == COMPRESSION_ADOBE_DEFLATE));

    /*
     * Merge codec-specific tag information.
     */
    if (!_TIFFMergeFields(tif, zipFields, TIFFArrayCount(zipFields))) {
        TIFFErrorExt(tif->tif_clientdata, module,
                 "Merging Deflate codec-specific tags failed");
        return 0;
    }

    /*
     * Allocate state block so tag methods have storage to record values.
     */
    tif->tif_data = (uint8*) _TIFFmalloc(sizeof (ZIPState));
    if (tif->tif_data == NULL)
        goto bad;
    sp = ZState(tif);
    sp->stream.zalloc = NULL;
    sp->stream.zfree = NULL;
    sp->stream.opaque = NULL;
    sp->stream.data_type = Z_BINARY;

    /*
     * Override parent get/set field methods.
     */
    sp->vgetparent = tif->tif_tagmethods.vgetfield;
    tif->tif_tagmethods.vgetfield = ZIPVGetField; /* hook for codec tags */
    sp->vsetparent = tif->tif_tagmethods.vsetfield;
    tif->tif_tagmethods.vsetfield = ZIPVSetField; /* hook for codec tags */

    /* Default values for codec-specific fields */
    sp->zipquality = Z_DEFAULT_COMPRESSION;	/* default comp. level */
    sp->state = 0;

    /*
     * Install codec methods.
     */
    tif->tif_fixuptags = ZIPFixupTags;
    tif->tif_setupdecode = ZIPSetupDecode;
    tif->tif_predecode = ZIPPreDecode;
    tif->tif_decoderow = ZIPDecode;
    tif->tif_decodestrip = ZIPDecode;
    tif->tif_decodetile = ZIPDecode;
    tif->tif_setupencode = ZIPSetupEncode;
    tif->tif_preencode = ZIPPreEncode;
    tif->tif_postencode = ZIPPostEncode;
    tif->tif_encoderow = ZIPEncode;
    tif->tif_encodestrip = ZIPEncode;
    tif->tif_encodetile = ZIPEncode;
    tif->tif_cleanup = ZIPCleanup;
    /*
     * Setup predictor setup.
     */
    (void) TIFFPredictorInit(tif);
    return (1);
bad:
    TIFFErrorExt(tif->tif_clientdata, module,
             "No space for ZIP state block");
    return (0);
}
#endif /* ZIP_SUPORT */

/* vim: set ts=8 sts=8 sw=8 noet: */
/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 8
 * fill-column: 78
 * End:
 */