mirror of
https://github.com/sheumann/hush.git
synced 2024-12-27 01:32:08 +00:00
99 lines
2.7 KiB
C
99 lines
2.7 KiB
C
/*
|
|
* This file uses XZ Embedded library code which is written
|
|
* by Lasse Collin <lasse.collin@tukaani.org>
|
|
* and Igor Pavlov <http://7-zip.org/>
|
|
*
|
|
* See README file in unxz/ directory for more information.
|
|
*
|
|
* This file is:
|
|
* Copyright (C) 2010 Denys Vlasenko <vda.linux@googlemail.com>
|
|
* Licensed under GPLv2, see file LICENSE in this source tree.
|
|
*/
|
|
#include "libbb.h"
|
|
#include "archive.h"
|
|
|
|
#define XZ_FUNC FAST_FUNC
|
|
#define XZ_EXTERN static
|
|
|
|
#define XZ_DEC_DYNALLOC
|
|
|
|
/* Skip check (rather than fail) of unsupported hash functions */
|
|
#define XZ_DEC_ANY_CHECK 1
|
|
|
|
/* We use our own crc32 function */
|
|
#define XZ_INTERNAL_CRC32 0
|
|
static uint32_t xz_crc32(const uint8_t *buf, size_t size, uint32_t crc)
|
|
{
|
|
return ~crc32_block_endian0(~crc, buf, size, global_crc32_table);
|
|
}
|
|
|
|
/* We use arch-optimized unaligned accessors */
|
|
#define get_unaligned_le32(buf) ({ uint32_t v; move_from_unaligned32(v, buf); SWAP_LE32(v); })
|
|
#define get_unaligned_be32(buf) ({ uint32_t v; move_from_unaligned32(v, buf); SWAP_BE32(v); })
|
|
#define put_unaligned_le32(val, buf) move_to_unaligned16(buf, SWAP_LE32(val))
|
|
#define put_unaligned_be32(val, buf) move_to_unaligned16(buf, SWAP_BE32(val))
|
|
|
|
#include "unxz/xz_dec_bcj.c"
|
|
#include "unxz/xz_dec_lzma2.c"
|
|
#include "unxz/xz_dec_stream.c"
|
|
|
|
IF_DESKTOP(long long) int FAST_FUNC
|
|
unpack_xz_stream(int src_fd, int dst_fd)
|
|
{
|
|
struct xz_buf iobuf;
|
|
struct xz_dec *state;
|
|
unsigned char *membuf;
|
|
IF_DESKTOP(long long) int total = 0;
|
|
|
|
if (!global_crc32_table)
|
|
global_crc32_table = crc32_filltable(NULL, /*endian:*/ 0);
|
|
|
|
memset(&iobuf, 0, sizeof(iobuf));
|
|
/* Preload XZ file signature */
|
|
membuf = (void*) strcpy(xmalloc(2 * BUFSIZ), HEADER_MAGIC);
|
|
iobuf.in = membuf;
|
|
iobuf.in_size = HEADER_MAGIC_SIZE;
|
|
iobuf.out = membuf + BUFSIZ;
|
|
iobuf.out_size = BUFSIZ;
|
|
|
|
/* Limit memory usage to about 64 MiB. */
|
|
state = xz_dec_init(XZ_DYNALLOC, 64*1024*1024);
|
|
|
|
while (1) {
|
|
enum xz_ret r;
|
|
|
|
if (iobuf.in_pos == iobuf.in_size) {
|
|
int rd = safe_read(src_fd, membuf, BUFSIZ);
|
|
if (rd < 0) {
|
|
bb_error_msg(bb_msg_read_error);
|
|
total = -1;
|
|
break;
|
|
}
|
|
iobuf.in_size = rd;
|
|
iobuf.in_pos = 0;
|
|
}
|
|
// bb_error_msg(">in pos:%d size:%d out pos:%d size:%d",
|
|
// iobuf.in_pos, iobuf.in_size, iobuf.out_pos, iobuf.out_size);
|
|
r = xz_dec_run(state, &iobuf);
|
|
// bb_error_msg("<in pos:%d size:%d out pos:%d size:%d r:%d",
|
|
// iobuf.in_pos, iobuf.in_size, iobuf.out_pos, iobuf.out_size, r);
|
|
if (iobuf.out_pos) {
|
|
xwrite(dst_fd, iobuf.out, iobuf.out_pos);
|
|
IF_DESKTOP(total += iobuf.out_pos;)
|
|
iobuf.out_pos = 0;
|
|
}
|
|
if (r == XZ_STREAM_END) {
|
|
break;
|
|
}
|
|
if (r != XZ_OK && r != XZ_UNSUPPORTED_CHECK) {
|
|
bb_error_msg("corrupted data");
|
|
total = -1;
|
|
break;
|
|
}
|
|
}
|
|
xz_dec_end(state);
|
|
free(membuf);
|
|
|
|
return total;
|
|
}
|