4 * Copyright (C) 1999 Linus Torvalds
5 * Copyright (C) 2000-2002 Transmeta Corporation
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.
11 * cramfs interfaces to the uncompression library. There's really just
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.
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.
26 #include <u-boot/zlib.h>
28 static z_stream stream;
30 void *zalloc(void *, unsigned, unsigned);
31 void zfree(void *, void *, unsigned);
33 /* Returns length of decompressed data. */
34 int cramfs_uncompress_block (void *dst, void *src, int srclen)
38 inflateReset (&stream);
41 stream.avail_in = srclen;
43 stream.next_out = dst;
44 stream.avail_out = 4096 * 2;
46 err = inflate (&stream, Z_FINISH);
48 if (err != Z_STREAM_END)
50 return stream.total_out;
53 /*printf ("Error %d while decompressing!\n", err); */
54 /*printf ("%p(%d)->%p\n", src, srclen, dst); */
58 int cramfs_uncompress_init (void)
62 stream.zalloc = zalloc;
67 #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
68 stream.outcb = (cb_func) WATCHDOG_RESET;
70 stream.outcb = Z_NULL;
71 #endif /* CONFIG_HW_WATCHDOG */
73 err = inflateInit (&stream);
75 printf ("Error: inflateInit2() returned %d\n", err);
82 int cramfs_uncompress_exit (void)