2 * This file uses XZ Embedded library code which is written
3 * by Lasse Collin <lasse.collin@tukaani.org>
4 * and Igor Pavlov <http://7-zip.org/>
6 * See README file in unxz/ directory for more information.
9 * Copyright (C) 2010 Denys Vlasenko <vda.linux@googlemail.com>
10 * Licensed under GPLv2, see file LICENSE in this source tree.
13 #include "bb_archive.h"
15 #define XZ_FUNC FAST_FUNC
16 #define XZ_EXTERN static
18 #define XZ_DEC_DYNALLOC
20 /* Skip check (rather than fail) of unsupported hash functions */
21 #define XZ_DEC_ANY_CHECK 1
23 /* We use our own crc32 function */
24 #define XZ_INTERNAL_CRC32 0
25 static uint32_t xz_crc32(const uint8_t *buf, size_t size, uint32_t crc)
27 return ~crc32_block_endian0(~crc, buf, size, global_crc32_table);
30 /* We use arch-optimized unaligned accessors */
31 #define get_unaligned_le32(buf) ({ uint32_t v; move_from_unaligned32(v, buf); SWAP_LE32(v); })
32 #define get_unaligned_be32(buf) ({ uint32_t v; move_from_unaligned32(v, buf); SWAP_BE32(v); })
33 #define put_unaligned_le32(val, buf) move_to_unaligned16(buf, SWAP_LE32(val))
34 #define put_unaligned_be32(val, buf) move_to_unaligned16(buf, SWAP_BE32(val))
36 #include "unxz/xz_dec_bcj.c"
37 #include "unxz/xz_dec_lzma2.c"
38 #include "unxz/xz_dec_stream.c"
40 IF_DESKTOP(long long) int FAST_FUNC
41 unpack_xz_stream(transformer_aux_data_t *aux, int src_fd, int dst_fd)
45 unsigned char *membuf;
46 IF_DESKTOP(long long) int total = 0;
48 if (!global_crc32_table)
49 global_crc32_table = crc32_filltable(NULL, /*endian:*/ 0);
51 memset(&iobuf, 0, sizeof(iobuf));
52 membuf = xmalloc(2 * BUFSIZ);
54 iobuf.out = membuf + BUFSIZ;
55 iobuf.out_size = BUFSIZ;
57 if (!aux || aux->check_signature == 0) {
58 /* Preload XZ file signature */
59 strcpy((char*)membuf, HEADER_MAGIC);
60 iobuf.in_size = HEADER_MAGIC_SIZE;
61 } /* else: let xz code read & check it */
63 /* Limit memory usage to about 64 MiB. */
64 state = xz_dec_init(XZ_DYNALLOC, 64*1024*1024);
69 if (iobuf.in_pos == iobuf.in_size) {
70 int rd = safe_read(src_fd, membuf, BUFSIZ);
72 bb_error_msg(bb_msg_read_error);
79 // bb_error_msg(">in pos:%d size:%d out pos:%d size:%d",
80 // iobuf.in_pos, iobuf.in_size, iobuf.out_pos, iobuf.out_size);
81 r = xz_dec_run(state, &iobuf);
82 // bb_error_msg("<in pos:%d size:%d out pos:%d size:%d r:%d",
83 // iobuf.in_pos, iobuf.in_size, iobuf.out_pos, iobuf.out_size, r);
85 xwrite(dst_fd, iobuf.out, iobuf.out_pos);
86 IF_DESKTOP(total += iobuf.out_pos;)
89 if (r == XZ_STREAM_END) {
92 if (r != XZ_OK && r != XZ_UNSUPPORTED_CHECK) {
93 bb_error_msg("corrupted data");