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/*
* zlibdl.c -- zlib dynamic load interface
*
* zlibdl.c is a part of binkd project
*
* Copyright (C) 2003 val khokhlov, FIDONet 2:550/180
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version. See COPYING.
*/
#if defined(ZLIBDL) && defined(_MSC_VER)
#pragma optimize("", off)
#endif
#include <stdlib.h>
#include "sys.h"
#include "zlibdl.h"
#include "compress.h"
#include "tools.h"
int compress_init(int type, int lvl, void **data)
{
switch (type) {
#ifdef WITH_BZLIB2
case 2: {
*data = calloc(1, sizeof(bz_stream));
if (*data == NULL) {
Log (1, "compress_init: not enough memory (%lu needed)", sizeof(bz_stream));
return BZ_MEM_ERROR;
}
/* if (lvl <= 0) */ lvl = 1; /* default is small (100K) buffer */
return BZ2_bzCompressInit((bz_stream *)*data, lvl, 0, 0);
}
#endif
#ifdef WITH_ZLIB
case 1: {
*data = calloc(1, sizeof(z_stream));
if (*data == NULL) {
Log (1, "compress_init: not enough memory (%lu needed)", sizeof(z_stream));
return Z_MEM_ERROR;
}
/* 0 is default compression level */
/* no compression means send file without GZ flag, not 0 compress level */
if (lvl <= 0) lvl = Z_DEFAULT_COMPRESSION;
return deflateInit((z_stream *)*data, lvl);
}
#endif
default:
Log (1, "Unknown compression method: %d; data lost", type);
}
return -1;
}
int do_compress(int type, char *dst, int *dst_len, char *src, int *src_len,
int finish, void *data) {
int rc;
switch (type) {
#ifdef WITH_BZLIB2
case 2: {
bz_stream *zstrm = (bz_stream *)data;
zstrm->next_in = (char *)src;
zstrm->avail_in = (unsigned int)*src_len;
zstrm->next_out = (char *)dst;
zstrm->avail_out = (unsigned int)*dst_len;
rc = BZ2_bzCompress(zstrm, finish ? BZ_FINISH : 0);
*src_len -= (int)zstrm->avail_in;
*dst_len -= (int)zstrm->avail_out;
if (rc == BZ_RUN_OK || rc == BZ_FLUSH_OK || rc == BZ_FINISH_OK) rc = 0;
if (rc == BZ_STREAM_END) rc = 1;
return rc;
}
#endif
#ifdef WITH_ZLIB
case 1: {
z_stream *zstrm = (z_stream *)data;
zstrm->next_in = (Bytef *)src;
zstrm->avail_in = (uLong)*src_len;
zstrm->next_out = (Bytef *)dst;
zstrm->avail_out = (uLong)*dst_len;
rc = deflate(zstrm, finish ? Z_FINISH : 0);
*src_len -= (int)zstrm->avail_in;
*dst_len -= (int)zstrm->avail_out;
if (rc == Z_STREAM_END) rc = 1;
return rc;
}
#endif
default:
Log (1, "Unknown compression method: %d; data lost", type);
}
return -1;
}
void compress_deinit(int type, void *data)
{
switch (type) {
#ifdef WITH_BZLIB2
case 2: {
int rc = BZ2_bzCompressEnd((bz_stream *)data);
if (rc < 0) Log (1, "BZ2_bzCompressEnd error: %d", rc);
break;
}
#endif
#ifdef WITH_ZLIB
case 1: {
int rc = deflateEnd((z_stream *)data);
if (rc < 0) Log (1, "deflateEnd error: %d", rc);
break;
}
#endif
default:
Log (1, "Unknown compression method: %d", type);
}
free(data);
return;
}
void compress_abort(int type, void *data)
{
char buf[1024];
int i, j;
if (data) {
Log (4, "Purge compress buffers");
do {
i=sizeof(buf);
j=0;
} while (do_compress(type, buf, &i, NULL, &j, 1, data) == 0 && i > 0);
compress_deinit(type, data);
}
}
int decompress_init(int type, void **data)
{
switch (type) {
#ifdef WITH_BZLIB2
case 2: {
*data = calloc(1, sizeof(bz_stream));
if (*data == NULL) {
Log (1, "decompress_init: not enough memory (%lu needed)", sizeof(bz_stream));
return BZ_MEM_ERROR;
}
return BZ2_bzDecompressInit((bz_stream *)*data, 0, 0);
}
#endif
#ifdef WITH_ZLIB
case 1: {
*data = calloc(1, sizeof(z_stream));
if (*data == NULL) {
Log (1, "decompress_init: not enough memory (%lu needed)", sizeof(z_stream));
return Z_MEM_ERROR;
}
return inflateInit((z_stream *)*data);
}
#endif
default:
Log (1, "Unknown compression method: %d; data lost", type);
}
return -1;
}
int do_decompress(int type, char *dst, int *dst_len, char *src, int *src_len, void *data) {
int rc;
switch (type) {
#ifdef WITH_BZLIB2
case 2: {
bz_stream *zstrm = (bz_stream *)data;
zstrm->next_in = (char *)src;
zstrm->avail_in = (unsigned int)*src_len;
zstrm->next_out = (char *)dst;
zstrm->avail_out = (unsigned int)*dst_len;
rc = BZ2_bzDecompress(zstrm);
*src_len -= (int)zstrm->avail_in;
*dst_len -= (int)zstrm->avail_out;
if (rc == BZ_RUN_OK || rc == BZ_FLUSH_OK) rc = 0;
if (rc == BZ_STREAM_END) rc = 1;
return rc;
}
#endif
#ifdef WITH_ZLIB
case 1: {
z_stream *zstrm = (z_stream *)data;
zstrm->next_in = (Bytef *)src;
zstrm->avail_in = (uLong)*src_len;
zstrm->next_out = (Bytef *)dst;
zstrm->avail_out = (uLong)*dst_len;
rc = inflate(zstrm, 0);
*src_len -= (int)zstrm->avail_in;
*dst_len -= (int)zstrm->avail_out;
if (rc == Z_STREAM_END) rc = 1;
return rc;
}
#endif
default:
Log (1, "Unknown compression method: %d; data lost", type);
}
return 0;
}
int decompress_deinit(int type, void *data)
{
int rc = -1;
switch (type) {
#ifdef WITH_BZLIB2
case 2: {
rc = BZ2_bzDecompressEnd((bz_stream *)data);
break;
}
#endif
#ifdef WITH_ZLIB
case 1: {
rc = inflateEnd((z_stream *)data);
break;
}
#endif
default:
Log (1, "Unknown compression method: %d", type);
break;
}
free(data);
return rc;
}
int decompress_abort(int type, void *data) {
char buf[1024];
int i, j;
if (data) {
Log (4, "Purge decompress buffers");
do {
i=sizeof(buf);
j=0;
} while (do_decompress(type, buf, &i, NULL, &j, data) == 0 && i > 0);
return decompress_deinit(type, data);
}
return 0;
}
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