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.
28 #if defined(CONFIG_CMD_JFFS2)
30 static z_stream stream;
32 void *zalloc(void *, unsigned, unsigned);
33 void zfree(void *, void *, unsigned);
35 /* Returns length of decompressed data. */
36 int cramfs_uncompress_block (void *dst, void *src, int srclen)
40 inflateReset (&stream);
43 stream.avail_in = srclen;
45 stream.next_out = dst;
46 stream.avail_out = 4096 * 2;
48 err = inflate (&stream, Z_FINISH);
50 if (err != Z_STREAM_END)
52 return stream.total_out;
55 /*printf ("Error %d while decompressing!\n", err); */
56 /*printf ("%p(%d)->%p\n", src, srclen, dst); */
60 int cramfs_uncompress_init (void)
64 stream.zalloc = zalloc;
69 #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
70 stream.outcb = (cb_func) WATCHDOG_RESET;
72 stream.outcb = Z_NULL;
73 #endif /* CONFIG_HW_WATCHDOG */
75 err = inflateInit (&stream);
77 printf ("Error: inflateInit2() returned %d\n", err);
84 int cramfs_uncompress_exit (void)
90 #endif /* CFG_FS_CRAMFS */