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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 | ||
23 | #include <common.h> | |
24 | #include <malloc.h> | |
25 | #include <watchdog.h> | |
a31e091a | 26 | #include <u-boot/zlib.h> |
dd875c76 | 27 | |
dd875c76 WD |
28 | static z_stream stream; |
29 | ||
dd875c76 WD |
30 | /* Returns length of decompressed data. */ |
31 | int cramfs_uncompress_block (void *dst, void *src, int srclen) | |
32 | { | |
33 | int err; | |
34 | ||
35 | inflateReset (&stream); | |
36 | ||
37 | stream.next_in = src; | |
38 | stream.avail_in = srclen; | |
39 | ||
40 | stream.next_out = dst; | |
41 | stream.avail_out = 4096 * 2; | |
42 | ||
43 | err = inflate (&stream, Z_FINISH); | |
44 | ||
45 | if (err != Z_STREAM_END) | |
46 | goto err; | |
47 | return stream.total_out; | |
48 | ||
49 | err: | |
50 | /*printf ("Error %d while decompressing!\n", err); */ | |
51 | /*printf ("%p(%d)->%p\n", src, srclen, dst); */ | |
52 | return -1; | |
53 | } | |
54 | ||
55 | int cramfs_uncompress_init (void) | |
56 | { | |
57 | int err; | |
58 | ||
e3ed0575 MF |
59 | stream.zalloc = gzalloc; |
60 | stream.zfree = gzfree; | |
dd875c76 WD |
61 | stream.next_in = 0; |
62 | stream.avail_in = 0; | |
63 | ||
64 | #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG) | |
65 | stream.outcb = (cb_func) WATCHDOG_RESET; | |
66 | #else | |
67 | stream.outcb = Z_NULL; | |
68 | #endif /* CONFIG_HW_WATCHDOG */ | |
69 | ||
70 | err = inflateInit (&stream); | |
71 | if (err != Z_OK) { | |
72 | printf ("Error: inflateInit2() returned %d\n", err); | |
73 | return -1; | |
74 | } | |
75 | ||
76 | return 0; | |
77 | } | |
78 | ||
79 | int cramfs_uncompress_exit (void) | |
80 | { | |
81 | inflateEnd (&stream); | |
82 | return 0; | |
83 | } |