source: branches/2.2.9/mindi-busybox/archival/libarchive/decompress_unxz.c @ 2725

Last change on this file since 2725 was 2725, checked in by Bruno Cornec, 9 years ago
  • Update mindi-busybox to 1.18.3 to avoid problems with the tar command which is now failing on recent versions with busybox 1.7.3
  • Property svn:eol-style set to native
File size: 2.7 KB
Line 
1/*
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/>
5 *
6 * See README file in unxz/ directory for more information.
7 *
8 * This file is:
9 * Copyright (C) 2010 Denys Vlasenko <vda.linux@googlemail.com>
10 * Licensed under GPLv2, see file LICENSE in this source tree.
11 */
12#include "libbb.h"
13#include "archive.h"
14
15#define XZ_FUNC FAST_FUNC
16#define XZ_EXTERN static
17
18#define XZ_DEC_DYNALLOC
19
20/* Skip check (rather than fail) of unsupported hash functions */
21#define XZ_DEC_ANY_CHECK  1
22
23/* We use our own crc32 function */
24#define XZ_INTERNAL_CRC32 0
25static uint32_t xz_crc32(const uint8_t *buf, size_t size, uint32_t crc)
26{
27    return ~crc32_block_endian0(~crc, buf, size, global_crc32_table);
28}
29
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))
35
36#include "unxz/xz_dec_bcj.c"
37#include "unxz/xz_dec_lzma2.c"
38#include "unxz/xz_dec_stream.c"
39
40IF_DESKTOP(long long) int FAST_FUNC
41unpack_xz_stream(int src_fd, int dst_fd)
42{
43    struct xz_buf iobuf;
44    struct xz_dec *state;
45    unsigned char *membuf;
46    IF_DESKTOP(long long) int total = 0;
47
48    if (!global_crc32_table)
49        global_crc32_table = crc32_filltable(NULL, /*endian:*/ 0);
50
51    memset(&iobuf, 0, sizeof(iobuf));
52    /* Preload XZ file signature */
53    membuf = (void*) strcpy(xmalloc(2 * BUFSIZ), HEADER_MAGIC);
54    iobuf.in = membuf;
55    iobuf.in_size = HEADER_MAGIC_SIZE;
56    iobuf.out = membuf + BUFSIZ;
57    iobuf.out_size = BUFSIZ;
58
59    /* Limit memory usage to about 64 MiB. */
60    state = xz_dec_init(XZ_DYNALLOC, 64*1024*1024);
61
62    while (1) {
63        enum xz_ret r;
64
65        if (iobuf.in_pos == iobuf.in_size) {
66            int rd = safe_read(src_fd, membuf, BUFSIZ);
67            if (rd < 0) {
68                bb_error_msg(bb_msg_read_error);
69                total = -1;
70                break;
71            }
72            iobuf.in_size = rd;
73            iobuf.in_pos = 0;
74        }
75//      bb_error_msg(">in pos:%d size:%d out pos:%d size:%d",
76//              iobuf.in_pos, iobuf.in_size, iobuf.out_pos, iobuf.out_size);
77        r = xz_dec_run(state, &iobuf);
78//      bb_error_msg("<in pos:%d size:%d out pos:%d size:%d r:%d",
79//              iobuf.in_pos, iobuf.in_size, iobuf.out_pos, iobuf.out_size, r);
80        if (iobuf.out_pos) {
81            xwrite(dst_fd, iobuf.out, iobuf.out_pos);
82            IF_DESKTOP(total += iobuf.out_pos;)
83            iobuf.out_pos = 0;
84        }
85        if (r == XZ_STREAM_END) {
86            break;
87        }
88        if (r != XZ_OK && r != XZ_UNSUPPORTED_CHECK) {
89            bb_error_msg("corrupted data");
90            total = -1;
91            break;
92        }
93    }
94    xz_dec_end(state);
95    free(membuf);
96
97    return total;
98}
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