/* $Header: /cvsroot/VTK/VTK/Utilities/tiff/tif_zip.c,v 1.3 2002/02/04 01:53:22 andy 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.
 */

#ifdef ZIP_SUPPORT
#include "zlib.h"
#endif

#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 <stdio.h>
#include <assert.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) {
                TIFFError(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) {
                        TIFFError(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) {
                        TIFFError(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) {
                TIFFError(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) {
                TIFFError(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) {
                        TIFFError(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 ((tsize_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 = tif->tif_rawdatasize;
                    }
                    break;
                default:
                    TIFFError(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);
        if (sp) {
                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;
        }
}

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) {
                                TIFFError(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,  "" },
};
#define N(a)    (sizeof (a) / sizeof (a[0]))

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, N(zipFieldInfo));
        sp->vgetparent = tif->tif_vgetfield;
        tif->tif_vgetfield = ZIPVGetField;      /* hook for codec tags */
        sp->vsetparent = tif->tif_vsetfield;
        tif->tif_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:
        TIFFError("TIFFInitZIP", "No space for ZIP state block");
        return (0);
}
#endif /* ZIP_SUPORT */
