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/*
* 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 defined(CONFIG_CMD_CRAMFS)
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 */
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