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tif_zip
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1995-10-12
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/* $Header: /usr/people/sam/tiff/libtiff/RCS/tif_zip.c,v 1.4 1995/07/17 14:38:12 sam Exp $ */
/*
* Copyright (c) 1995 Sam Leffler
* Copyright (c) 1995 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 (i.e. Deflate) Compression Support
*
* This file is simply an interface to the libgz library written by
* Jean-loup Gailly and Mark Adler. Use version 0.92 or later of
* the library. 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/graphics/png/code/zlib-0.93.tar.gz.
*/
#include "tif_predict.h"
#include "zlib.h"
#include "zutil.h"
#include <stdio.h>
#include <assert.h>
/*
* State block for each open TIFF
* file using ZIP compression/decompression.
*/
typedef struct {
TIFFPredictorState predict;
z_stream stream;
} ZIPState;
#define DecoderState(tif) ((ZIPState*) (tif)->tif_data)
#define EncoderState(tif) ((ZIPState*) (tif)->tif_data)
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 char module[] = "ZIPSetupDecode";
assert(sp != NULL);
if (inflateInit2(&sp->stream, -DEF_WBITS) != Z_OK) {
TIFFError(module, "%s: %s", tif->tif_name, sp->stream.msg);
return (0);
} else
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 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: libgz 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 char module[] = "ZIPSetupEncode";
assert(sp != NULL);
/*
* We use the undocumented feature of a negiatve window
* bits to suppress writing the header in the output
* stream. This is necessary when the resulting image
* is made up of multiple strips or tiles as otherwise
* libgz will not write a header for each strip/tile and
* the decoder will fail.
*/
if (deflateInit2(&sp->stream, Z_DEFAULT_COMPRESSION,
DEFLATED, -MAX_WBITS, DEF_MEM_LEVEL, 0) != Z_OK) {
TIFFError(module, "%s: %s", tif->tif_name, sp->stream.msg);
return (0);
} else
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 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 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 (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: libgz error: %s",
tif->tif_name, sp->stream.msg);
return (0);
}
} while (state != Z_STREAM_END);
return (1);
}
static void
ZIPCleanup(TIFF* tif)
{
ZIPState* sp = (ZIPState*) tif->tif_data;
if (sp) {
if (tif->tif_mode == O_RDONLY)
inflateEnd(&sp->stream);
else
deflateEnd(&sp->stream);
_TIFFfree(sp);
tif->tif_data = NULL;
}
}
int
TIFFInitZIP(TIFF* tif, int scheme)
{
ZIPState* sp;
assert(scheme == COMPRESSION_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 = (ZIPState*) tif->tif_data;
sp->stream.zalloc = NULL;
sp->stream.zfree = NULL;
sp->stream.opaque = NULL;
sp->stream.data_type = Z_BINARY;
/*
* 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 */