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
29static z_stream stream;
30
31/* Returns length of decompressed data. */
32int 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
56int 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
80int cramfs_uncompress_exit (void)
81{
82	inflateEnd (&stream);
83	return 0;
84}
85