/* $Id: tif_zip.c 4718 2009-08-07 15:17:36Z adcockj $ */

/*
 * 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    0x1        /* zlib setup successfully */

    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*, tidata_t, tsize_t, tsample_t);
static    int ZIPDecode(TIFF*, tidata_t, tsize_t, tsample_t);

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

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

/*
 * Setup state for decoding a strip.
 */
static int
ZIPPreDecode(TIFF* tif, tsample_t s)
{
    ZIPState* sp = DecoderState(tif);

    (void) s;
    assert(sp != NULL);
    sp->stream.next_in = tif->tif_rawdata;
    sp->stream.avail_in = tif->tif_rawcc;
    return (inflateReset(&sp->stream) == Z_OK);
}

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

    (void) s;
    assert(sp != NULL);
    sp->stream.next_out = op;
    sp->stream.avail_out = occ;
    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,
                "%s: Decoding error at scanline %d, %s",
                tif->tif_name, tif->tif_row, sp->stream.msg);
            if (inflateSync(&sp->stream) != Z_OK)
                return (0);
            continue;
        }
        if (state != Z_OK) {
            TIFFErrorExt(tif->tif_clientdata, module, "%s: zlib error: %s",
                tif->tif_name, sp->stream.msg);
            return (0);
        }
    } while (sp->stream.avail_out > 0);
    if (sp->stream.avail_out != 0) {
        TIFFErrorExt(tif->tif_clientdata, module,
            "%s: Not enough data at scanline %d (short %d bytes)",
            tif->tif_name, tif->tif_row, sp->stream.avail_out);
        return (0);
    }
    return (1);
}

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

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

/*
 * Reset encoding state at the start of a strip.
 */
static int
ZIPPreEncode(TIFF* tif, tsample_t s)
{
    ZIPState *sp = EncoderState(tif);

    (void) s;
    assert(sp != NULL);
    sp->stream.next_out = tif->tif_rawdata;
    sp->stream.avail_out = tif->tif_rawdatasize;
    return (deflateReset(&sp->stream) == Z_OK);
}

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

    (void) s;
    sp->stream.next_in = bp;
    sp->stream.avail_in = cc;
    do {
        if (deflate(&sp->stream, Z_NO_FLUSH) != Z_OK) {
            TIFFErrorExt(tif->tif_clientdata, module, "%s: Encoder error: %s",
                tif->tif_name, 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 = tif->tif_rawdatasize;
        }
    } 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)
{
    ZIPState *sp = EncoderState(tif);
    static const char module[] = "ZIPPostEncode";
    int state;

    sp->stream.avail_in = 0;
    do {
        state = deflate(&sp->stream, Z_FINISH);
        switch (state) {
        case Z_STREAM_END:
        case Z_OK:
            if ((int)sp->stream.avail_out != (int)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 = tif->tif_rawdatasize;
            }
            break;
        default:
            TIFFErrorExt(tif->tif_clientdata, module, "%s: zlib error: %s",
            tif->tif_name, 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) {
        /* NB: avoid problems in the library */
        if (tif->tif_mode == O_RDONLY)
            inflateEnd(&sp->stream);
        else
            deflateEnd(&sp->stream);
    }
    _TIFFfree(sp);
    tif->tif_data = NULL;

    _TIFFSetDefaultCompressionState(tif);
}

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

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

static int
ZIPVGetField(TIFF* tif, ttag_t 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 TIFFFieldInfo zipFieldInfo[] = {
    { TIFFTAG_ZIPQUALITY,     0, 0,    TIFF_ANY,    FIELD_PSEUDO,
      TRUE,    FALSE,    "" },
};

int
TIFFInitZIP(TIFF* tif, int scheme)
{
    ZIPState* sp;

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

    /*
     * Allocate state block so tag methods have storage to record values.
     */
    tif->tif_data = (tidata_t) _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;

    /*
     * Merge codec-specific tag information and
     * override parent get/set field methods.
     */
    _TIFFMergeFieldInfo(tif, zipFieldInfo, TIFFArrayCount(zipFieldInfo));
    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_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, "TIFFInitZIP",
             "No space for ZIP state block");
    return (0);
}
#endif /* ZIP_SUPORT */

/* vim: set ts=8 sts=8 sw=8 noet: */
