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 <cyclic.h>
25 #include <malloc.h>
26 #include <watchdog.h>
27 #include <u-boot/zlib.h>
28
29 static z_stream stream;
30
31 /* Returns length of decompressed data. */
cramfs_uncompress_block(void * dst,void * src,int srclen)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
cramfs_uncompress_init(void)56 int cramfs_uncompress_init (void)
57 {
58 int err;
59
60 stream.zalloc = gzalloc;
61 stream.zfree = gzfree;
62 stream.next_in = 0;
63 stream.avail_in = 0;
64
65 #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
66 stream.outcb = (cb_func)cyclic_run;
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
cramfs_uncompress_exit(void)80 int cramfs_uncompress_exit (void)
81 {
82 inflateEnd (&stream);
83 return 0;
84 }
85