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>
26 #include <u-boot/zlib.h>
27
28 static z_stream stream;
29
30 void *zalloc(void *, unsigned, unsigned);
31 void zfree(void *, void *, unsigned);
32
33 /* Returns length of decompressed data. */
cramfs_uncompress_block(void * dst,void * src,int srclen)34 int cramfs_uncompress_block (void *dst, void *src, int srclen)
35 {
36 int err;
37
38 inflateReset (&stream);
39
40 stream.next_in = src;
41 stream.avail_in = srclen;
42
43 stream.next_out = dst;
44 stream.avail_out = 4096 * 2;
45
46 err = inflate (&stream, Z_FINISH);
47
48 if (err != Z_STREAM_END)
49 goto err;
50 return stream.total_out;
51
52 err:
53 /*printf ("Error %d while decompressing!\n", err); */
54 /*printf ("%p(%d)->%p\n", src, srclen, dst); */
55 return -1;
56 }
57
cramfs_uncompress_init(void)58 int cramfs_uncompress_init (void)
59 {
60 int err;
61
62 stream.zalloc = zalloc;
63 stream.zfree = zfree;
64 stream.next_in = 0;
65 stream.avail_in = 0;
66
67 #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
68 stream.outcb = (cb_func) WATCHDOG_RESET;
69 #else
70 stream.outcb = Z_NULL;
71 #endif /* CONFIG_HW_WATCHDOG */
72
73 err = inflateInit (&stream);
74 if (err != Z_OK) {
75 printf ("Error: inflateInit2() returned %d\n", err);
76 return -1;
77 }
78
79 return 0;
80 }
81
cramfs_uncompress_exit(void)82 int cramfs_uncompress_exit (void)
83 {
84 inflateEnd (&stream);
85 return 0;
86 }
87