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/*
* This file is a part of Pcompress, a chunked parallel multi-
* algorithm lossless compression and decompression program.
*
* Copyright (C) 2012 Moinak Ghosh. All rights reserved.
* Use is subject to license terms.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* moinakg@belenix.org, http://moinakg.wordpress.com/
*
* This program includes partly-modified public domain source
* code from the LZMA SDK: http://www.7-zip.org/sdk.html
*/
#include <sys/types.h>
#include <stdio.h>
#include <strings.h>
#include <limits.h>
#include <utils.h>
#include <pcompress.h>
#include <lzfx.h>
#include <allocator.h>
struct lzfx_params {
uint32_t htab_bits;
};
void
lz_fx_stats(int show)
{
}
int
lz_fx_init(void **data, int *level, int nthreads, ssize_t chunksize)
{
struct lzfx_params *lzdat;
int lev;
if (chunksize > UINT_MAX) {
fprintf(stderr, "Chunk size too big for LZFX.\n");
return (1);
}
lzdat = slab_alloc(NULL, sizeof (struct lzfx_params));
lev = *level;
if (lev > 5) lev = 5;
lzdat->htab_bits = 16 + (lev-1);
*data = lzdat;
if (*level > 9) *level = 9;
return (0);
}
int
lz_fx_deinit(void **data)
{
struct lzfx_params *lzdat = (struct lzfx_params *)(*data);
if (lzdat) {
slab_free(NULL, lzdat);
}
*data = NULL;
return (0);
}
static void
lz_fx_err(int err)
{
switch (err) {
case LZFX_ESIZE:
fprintf(stderr, "LZFX: Output buffer too small.\n");
break;
case LZFX_ECORRUPT:
fprintf(stderr, "LZFX: Corrupt data for decompression.\n");
break;
case LZFX_EARGS:
fprintf(stderr, "LZFX: Invalid arguments.\n");
break;
case LZFX_ENOMEM:
fprintf(stderr, "LZFX: Out of memory when allocating hashtable.\n");
break;
default:
fprintf(stderr, "LZFX: Unknown error code: %d\n", err);
}
}
int
lz_fx_compress(void *src, size_t srclen, void *dst, size_t *dstlen,
int level, uchar_t chdr, void *data)
{
int rv;
struct lzfx_params *lzdat = (struct lzfx_params *)data;
unsigned int _srclen = srclen;
unsigned int _dstlen = *dstlen;
rv = lzfx_compress(src, _srclen, dst, &_dstlen, lzdat->htab_bits);
if (rv != 0) {
if (rv != LZFX_ESIZE)
lz_fx_err(rv);
return (-1);
}
*dstlen = _dstlen;
return (0);
}
int
lz_fx_decompress(void *src, size_t srclen, void *dst, size_t *dstlen,
int level, uchar_t chdr, void *data)
{
int rv;
unsigned int _srclen = srclen;
unsigned int _dstlen = *dstlen;
rv = lzfx_decompress(src, _srclen, dst, &_dstlen);
if (rv != 0) {
lz_fx_err(rv);
return (-1);
}
*dstlen = _dstlen;
return (0);
}
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