200 lines
4.4 KiB
C
200 lines
4.4 KiB
C
/*
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* LZO decompressor for barebox. Code borrowed from the lzo
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* implementation by Markus Franz Xaver Johannes Oberhumer.
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*
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* Linux kernel adaptation:
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* Copyright (C) 2009
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* Albin Tonnerre, Free Electrons <albin.tonnerre@free-electrons.com>
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*
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* Original code:
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* Copyright (C) 1996-2005 Markus Franz Xaver Johannes Oberhumer
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* All Rights Reserved.
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*
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* lzop and the LZO library are free software; you can redistribute them
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* and/or modify them under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING.
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* If not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Markus F.X.J. Oberhumer
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* <markus@oberhumer.com>
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* http://www.oberhumer.com/opensource/lzop/
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*/
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#include <common.h>
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#include <malloc.h>
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#include <linux/types.h>
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#include <lzo.h>
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#include <errno.h>
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#include <fs.h>
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#include <xfuncs.h>
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#include <linux/compiler.h>
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#include <asm/unaligned.h>
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static const unsigned char lzop_magic[] = {
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0x89, 0x4c, 0x5a, 0x4f, 0x00, 0x0d, 0x0a, 0x1a, 0x0a };
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#define LZO_BLOCK_SIZE (256*1024l)
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#define HEADER_HAS_FILTER 0x00000800L
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static inline int parse_header(int in_fd)
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{
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u8 l;
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u16 version;
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int ret;
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unsigned char buf[256]; /* maximum filename length + 1 */
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/* read magic (9), library version (2), 'need to be extracted'
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* version (2) and method (1)
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*/
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ret = read(in_fd, buf, 9);
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if (ret < 0)
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return ret;
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/* check magic */
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for (l = 0; l < 9; l++) {
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if (buf[l] != lzop_magic[l])
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return -EINVAL;
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}
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ret = read(in_fd, buf, 4); /* version, lib_version */
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if (ret < 0)
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return ret;
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version = get_unaligned_be16(buf);
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if (version >= 0x0940) {
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ret = read(in_fd, buf, 2); /* version to extract */
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if (ret < 0)
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return ret;
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}
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ret = read(in_fd, buf, 1); /* method */
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if (ret < 0)
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return ret;
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if (version >= 0x0940)
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read(in_fd, buf, 1); /* level */
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ret = read(in_fd, buf, 4); /* flags */
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if (ret < 0)
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return ret;
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if (get_unaligned_be32(buf) & HEADER_HAS_FILTER) {
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ret = read(in_fd, buf, 4); /* skip filter info */
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if (ret < 0)
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return ret;
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}
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/* skip mode and mtime_low */
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ret = read(in_fd, buf, 8);
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if (ret < 0)
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return ret;
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if (version >= 0x0940) {
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ret = read(in_fd, buf, 4); /* skip mtime_high */
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if (ret < 0)
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return ret;
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}
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ret = read(in_fd, &l, 1);
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if (ret < 0)
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return ret;
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/* don't care about the file name, and skip checksum */
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ret = read(in_fd, buf, l + 4);
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if (ret < 0)
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return ret;
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return 0;
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}
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int unlzo(int in_fd, int out_fd, int *dest_len)
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{
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u8 r = 0;
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u32 src_len, dst_len;
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size_t tmp;
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u8 *in_buf, *out_buf;
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int obytes_processed = 0;
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unsigned char buf[8];
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int ret;
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if (parse_header(in_fd))
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return -EINVAL;
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out_buf = xmalloc(LZO_BLOCK_SIZE);
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in_buf = xmalloc(lzo1x_worst_compress(LZO_BLOCK_SIZE));
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for (;;) {
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/* read uncompressed block size */
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ret = read(in_fd, buf, 4);
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if (ret < 0)
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goto exit_free;
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dst_len = get_unaligned_be32(buf);
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/* exit if last block */
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if (dst_len == 0)
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break;
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if (dst_len > LZO_BLOCK_SIZE) {
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printf("dest len longer than block size");
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goto exit_free;
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}
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/* read compressed block size, and skip block checksum info */
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ret = read(in_fd, buf, 8);
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if (ret < 0)
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goto exit_free;
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src_len = get_unaligned_be32(buf);
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if (src_len <= 0 || src_len > dst_len) {
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printf("file corrupted");
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goto exit_free;
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}
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ret = read(in_fd, in_buf, src_len);
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if (ret < 0)
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goto exit_free;
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/* decompress */
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tmp = dst_len;
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if (src_len < dst_len) {
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r = lzo1x_decompress_safe((u8 *) in_buf, src_len,
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out_buf, &tmp);
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if (r != LZO_E_OK || dst_len != tmp) {
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printf("Compressed data violation");
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goto exit_free;
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}
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ret = write(out_fd, out_buf, dst_len);
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if (ret < 0)
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goto exit_free;
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} else {
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if (src_len != dst_len) {
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printf("Compressed data violation");
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goto exit_free;
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}
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ret = write(out_fd, in_buf, dst_len);
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if (ret < 0)
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goto exit_free;
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}
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obytes_processed += dst_len;
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}
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exit_free:
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free(in_buf);
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free(out_buf);
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*dest_len = obytes_processed;
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return 0;
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}
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