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/* $Id: tif_zip.c,v 1.11 2015/02/19 22:39:59 drolon 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 suppressing 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/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

#define SAFE_MSG(sp)   ((sp)->stream.msg == NULL ? "" : (sp)->stream.msg)

/*
 * 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", SAFE_MSG(sp));
		return (0);
	} else {
		sp->state |= ZSTATE_INIT_DECODE;
		return (1);
	}