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dd875c76 WD |
1 | /* |
2 | * uncompress.c | |
3 | * | |
4 | * Copyright (C) 1999 Linus Torvalds | |
5 | * Copyright (C) 2000-2002 Transmeta Corporation | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License (Version 2) as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * cramfs interfaces to the uncompression library. There's really just | |
12 | * three entrypoints: | |
13 | * | |
14 | * - cramfs_uncompress_init() - called to initialize the thing. | |
15 | * - cramfs_uncompress_exit() - tell me when you're done | |
16 | * - cramfs_uncompress_block() - uncompress a block. | |
17 | * | |
18 | * NOTE NOTE NOTE! The uncompression is entirely single-threaded. We | |
19 | * only have one stream, and we'll initialize it only once even if it | |
20 | * then is used by multiple filesystems. | |
21 | */ | |
22 | ||
d678a59d | 23 | #include <common.h> |
29caf930 | 24 | #include <cyclic.h> |
dd875c76 WD |
25 | #include <malloc.h> |
26 | #include <watchdog.h> | |
a31e091a | 27 | #include <u-boot/zlib.h> |
dd875c76 | 28 | |
dd875c76 WD |
29 | static z_stream stream; |
30 | ||
dd875c76 WD |
31 | /* Returns length of decompressed data. */ |
32 | int cramfs_uncompress_block (void *dst, void *src, int srclen) | |
33 | { | |
34 | int err; | |
35 | ||
36 | inflateReset (&stream); | |
37 | ||
38 | stream.next_in = src; | |
39 | stream.avail_in = srclen; | |
40 | ||
41 | stream.next_out = dst; | |
42 | stream.avail_out = 4096 * 2; | |
43 | ||
44 | err = inflate (&stream, Z_FINISH); | |
45 | ||
46 | if (err != Z_STREAM_END) | |
47 | goto err; | |
48 | return stream.total_out; | |
49 | ||
50 | err: | |
51 | /*printf ("Error %d while decompressing!\n", err); */ | |
52 | /*printf ("%p(%d)->%p\n", src, srclen, dst); */ | |
53 | return -1; | |
54 | } | |
55 | ||
56 | int cramfs_uncompress_init (void) | |
57 | { | |
58 | int err; | |
59 | ||
e3ed0575 MF |
60 | stream.zalloc = gzalloc; |
61 | stream.zfree = gzfree; | |
dd875c76 WD |
62 | stream.next_in = 0; |
63 | stream.avail_in = 0; | |
64 | ||
65 | #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG) | |
29caf930 | 66 | stream.outcb = (cb_func)cyclic_run; |
dd875c76 WD |
67 | #else |
68 | stream.outcb = Z_NULL; | |
69 | #endif /* CONFIG_HW_WATCHDOG */ | |
70 | ||
71 | err = inflateInit (&stream); | |
72 | if (err != Z_OK) { | |
73 | printf ("Error: inflateInit2() returned %d\n", err); | |
74 | return -1; | |
75 | } | |
76 | ||
77 | return 0; | |
78 | } | |
79 | ||
80 | int cramfs_uncompress_exit (void) | |
81 | { | |
82 | inflateEnd (&stream); | |
83 | return 0; | |
84 | } |