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author | wdenk <wdenk> | 2004-01-03 21:24:46 (GMT) |
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committer | wdenk <wdenk> | 2004-01-03 21:24:46 (GMT) |
commit | dd875c767e6fb0f4fecfb799b706d84562a7acee (patch) | |
tree | b008f2786749b0a6455d2de9a01146e0ee6453b2 /fs/cramfs/uncompress.c | |
parent | c935d3bd8b1c7f681ad58e64bd0548e1b26a7d2f (diff) | |
download | u-boot-dd875c767e6fb0f4fecfb799b706d84562a7acee.tar.xz |
* Patch by Robert Schwebel, 15 Dec 2003:
add support for cramfs (uses JFFS2 command interface)
Diffstat (limited to 'fs/cramfs/uncompress.c')
-rw-r--r-- | fs/cramfs/uncompress.c | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/fs/cramfs/uncompress.c b/fs/cramfs/uncompress.c new file mode 100644 index 0000000..170832a --- /dev/null +++ b/fs/cramfs/uncompress.c @@ -0,0 +1,106 @@ +/* + * uncompress.c + * + * Copyright (C) 1999 Linus Torvalds + * Copyright (C) 2000-2002 Transmeta Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License (Version 2) as + * published by the Free Software Foundation. + * + * cramfs interfaces to the uncompression library. There's really just + * three entrypoints: + * + * - cramfs_uncompress_init() - called to initialize the thing. + * - cramfs_uncompress_exit() - tell me when you're done + * - cramfs_uncompress_block() - uncompress a block. + * + * NOTE NOTE NOTE! The uncompression is entirely single-threaded. We + * only have one stream, and we'll initialize it only once even if it + * then is used by multiple filesystems. + */ + +#include <common.h> +#include <malloc.h> +#include <watchdog.h> +#include <zlib.h> + +#if (CONFIG_COMMANDS & CFG_CMD_JFFS2) + +static z_stream stream; + +#define ZALLOC_ALIGNMENT 16 + +static void *zalloc (void *x, unsigned items, unsigned size) +{ + void *p; + + size *= items; + size = (size + ZALLOC_ALIGNMENT - 1) & ~(ZALLOC_ALIGNMENT - 1); + + p = malloc (size); + + return (p); +} + +static void zfree (void *x, void *addr, unsigned nb) +{ + free (addr); +} + +/* Returns length of decompressed data. */ +int cramfs_uncompress_block (void *dst, void *src, int srclen) +{ + int err; + + inflateReset (&stream); + + stream.next_in = src; + stream.avail_in = srclen; + + stream.next_out = dst; + stream.avail_out = 4096 * 2; + + err = inflate (&stream, Z_FINISH); + + if (err != Z_STREAM_END) + goto err; + return stream.total_out; + + err: + /*printf ("Error %d while decompressing!\n", err); */ + /*printf ("%p(%d)->%p\n", src, srclen, dst); */ + return -1; +} + +int cramfs_uncompress_init (void) +{ + int err; + + stream.zalloc = zalloc; + stream.zfree = zfree; + stream.next_in = 0; + stream.avail_in = 0; + +#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG) + stream.outcb = (cb_func) WATCHDOG_RESET; +#else + stream.outcb = Z_NULL; +#endif /* CONFIG_HW_WATCHDOG */ + + err = inflateInit (&stream); + if (err != Z_OK) { + printf ("Error: inflateInit2() returned %d\n", err); + return -1; + } + + return 0; +} + +int cramfs_uncompress_exit (void) +{ + inflateEnd (&stream); + return 0; +} + +#endif /* CFG_FS_CRAMFS */ |