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/*
* Copyright (C) 2008 Nokia Corporation.
* Copyright (C) 2008 University of Szeged, Hungary
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* 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 General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors: Artem Bityutskiy
* Adrian Hunter
* Zoltan Sogor
*/
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <zlib.h>
#include <lzo/lzo1x.h>
#include <linux/types.h>
#include "compr.h"
#include "ubifs-media.h"
#include "mkfs.ubifs.h"
static void *lzo_mem;
static unsigned long long errcnt = 0;
#define DEFLATE_DEF_LEVEL Z_DEFAULT_COMPRESSION
#define DEFLATE_DEF_WINBITS 11
#define DEFLATE_DEF_MEMLEVEL 8
static int zlib_deflate(void *in_buf, size_t in_len, void *out_buf,
size_t *out_len)
{
z_stream strm;
strm.zalloc = NULL;
strm.zfree = NULL;
/*
* Match exactly the zlib parameters used by the Linux kernel crypto
* API.
*/
if (deflateInit2(&strm, DEFLATE_DEF_LEVEL, Z_DEFLATED,
-DEFLATE_DEF_WINBITS, DEFLATE_DEF_MEMLEVEL,
Z_DEFAULT_STRATEGY)) {
errcnt += 1;
return -1;
}
strm.next_in = in_buf;
strm.avail_in = in_len;
strm.total_in = 0;
strm.next_out = out_buf;
strm.avail_out = *out_len;
strm.total_out = 0;
if (deflate(&strm, Z_FINISH) != Z_STREAM_END) {
deflateEnd(&strm);
errcnt += 1;
return -1;
}
if (deflateEnd(&strm) != Z_OK) {
errcnt += 1;
return -1;
}
*out_len = strm.total_out;
return 0;
}
static int lzo_compress(void *in_buf, size_t in_len, void *out_buf,
size_t *out_len)
{
lzo_uint len;
int ret;
len = *out_len;
ret = lzo1x_999_compress(in_buf, in_len, out_buf, &len, lzo_mem);
*out_len = len;
if (ret != LZO_E_OK) {
errcnt += 1;
return -1;
}
return 0;
}
static int no_compress(void *in_buf, size_t in_len, void *out_buf,
size_t *out_len)
{
memcpy(out_buf, in_buf, in_len);
*out_len = in_len;
return 0;
}
static char *zlib_buf;
static int favor_lzo_compress(void *in_buf, size_t in_len, void *out_buf,
size_t *out_len, int *type)
{
int lzo_ret, zlib_ret;
size_t lzo_len, zlib_len;
lzo_len = zlib_len = *out_len;
lzo_ret = lzo_compress(in_buf, in_len, out_buf, &lzo_len);
zlib_ret = zlib_deflate(in_buf, in_len, zlib_buf, &zlib_len);
if (lzo_ret && zlib_ret)
/* Both compressors failed */
return -1;
if (!lzo_ret && !zlib_ret) {
double percent;
/* Both compressors succeeded */
if (lzo_len <= zlib_len )
goto select_lzo;
percent = (double)zlib_len / (double)lzo_len;
percent *= 100;
if (percent > 100 - c->favor_lzo)
goto select_lzo;
goto select_zlib;
}
if (lzo_ret)
/* Only zlib compressor succeeded */
goto select_zlib;
/* Only LZO compressor succeeded */
select_lzo:
*out_len = lzo_len;
*type = MKFS_UBIFS_COMPR_LZO;
return 0;
select_zlib:
*out_len = zlib_len;
*type = MKFS_UBIFS_COMPR_ZLIB;
memcpy(out_buf, zlib_buf, zlib_len);
return 0;
}
int compress_data(void *in_buf, size_t in_len, void *out_buf, size_t *out_len,
int type)
{
int ret;
if (in_len < UBIFS_MIN_COMPR_LEN) {
no_compress(in_buf, in_len, out_buf, out_len);
return MKFS_UBIFS_COMPR_NONE;
}
if (c->favor_lzo)
ret = favor_lzo_compress(in_buf, in_len, out_buf, out_len, &type);
else {
switch (type) {
case MKFS_UBIFS_COMPR_LZO:
ret = lzo_compress(in_buf, in_len, out_buf, out_len);
break;
case MKFS_UBIFS_COMPR_ZLIB:
ret = zlib_deflate(in_buf, in_len, out_buf, out_len);
break;
case MKFS_UBIFS_COMPR_NONE:
ret = 1;
break;
default:
errcnt += 1;
ret = 1;
break;
}
}
if (ret || *out_len >= in_len) {
no_compress(in_buf, in_len, out_buf, out_len);
return MKFS_UBIFS_COMPR_NONE;
}
return type;
}
int init_compression(void)
{
lzo_mem = malloc(LZO1X_999_MEM_COMPRESS);
if (!lzo_mem)
return -1;
zlib_buf = malloc(UBIFS_BLOCK_SIZE * WORST_COMPR_FACTOR);
if (!zlib_buf) {
free(lzo_mem);
return -1;
}
return 0;
}
void destroy_compression(void)
{
free(zlib_buf);
free(lzo_mem);
if (errcnt)
fprintf(stderr, "%llu compression errors occurred\n", errcnt);
}
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