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wdenkdd875c72004-01-03 21:24:46 +00001/*
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>
26#include <zlib.h>
27
28#if (CONFIG_COMMANDS & CFG_CMD_JFFS2)
29
30static z_stream stream;
31
32#define ZALLOC_ALIGNMENT 16
33
34static void *zalloc (void *x, unsigned items, unsigned size)
35{
36 void *p;
37
38 size *= items;
39 size = (size + ZALLOC_ALIGNMENT - 1) & ~(ZALLOC_ALIGNMENT - 1);
40
41 p = malloc (size);
42
43 return (p);
44}
45
46static void zfree (void *x, void *addr, unsigned nb)
47{
48 free (addr);
49}
50
51/* Returns length of decompressed data. */
52int cramfs_uncompress_block (void *dst, void *src, int srclen)
53{
54 int err;
55
56 inflateReset (&stream);
57
58 stream.next_in = src;
59 stream.avail_in = srclen;
60
61 stream.next_out = dst;
62 stream.avail_out = 4096 * 2;
63
64 err = inflate (&stream, Z_FINISH);
65
66 if (err != Z_STREAM_END)
67 goto err;
68 return stream.total_out;
69
70 err:
71 /*printf ("Error %d while decompressing!\n", err); */
72 /*printf ("%p(%d)->%p\n", src, srclen, dst); */
73 return -1;
74}
75
76int cramfs_uncompress_init (void)
77{
78 int err;
79
80 stream.zalloc = zalloc;
81 stream.zfree = zfree;
82 stream.next_in = 0;
83 stream.avail_in = 0;
84
85#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
86 stream.outcb = (cb_func) WATCHDOG_RESET;
87#else
88 stream.outcb = Z_NULL;
89#endif /* CONFIG_HW_WATCHDOG */
90
91 err = inflateInit (&stream);
92 if (err != Z_OK) {
93 printf ("Error: inflateInit2() returned %d\n", err);
94 return -1;
95 }
96
97 return 0;
98}
99
100int cramfs_uncompress_exit (void)
101{
102 inflateEnd (&stream);
103 return 0;
104}
105
106#endif /* CFG_FS_CRAMFS */