107 lines
2.2 KiB
C
107 lines
2.2 KiB
C
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/*
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* uncompress.c
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*
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* Copyright (C) 1999 Linus Torvalds
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* Copyright (C) 2000-2002 Transmeta Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License (Version 2) as
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* published by the Free Software Foundation.
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*
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* cramfs interfaces to the uncompression library. There's really just
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* three entrypoints:
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*
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* - cramfs_uncompress_init() - called to initialize the thing.
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* - cramfs_uncompress_exit() - tell me when you're done
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* - cramfs_uncompress_block() - uncompress a block.
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*
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* NOTE NOTE NOTE! The uncompression is entirely single-threaded. We
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* only have one stream, and we'll initialize it only once even if it
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* then is used by multiple filesystems.
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*/
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#include <common.h>
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#include <malloc.h>
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#include <watchdog.h>
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#include <zlib.h>
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#if (CONFIG_COMMANDS & CFG_CMD_JFFS2)
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static z_stream stream;
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#define ZALLOC_ALIGNMENT 16
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static void *zalloc (void *x, unsigned items, unsigned size)
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{
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void *p;
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size *= items;
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size = (size + ZALLOC_ALIGNMENT - 1) & ~(ZALLOC_ALIGNMENT - 1);
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p = malloc (size);
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return (p);
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}
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static void zfree (void *x, void *addr, unsigned nb)
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{
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free (addr);
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}
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/* Returns length of decompressed data. */
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int cramfs_uncompress_block (void *dst, void *src, int srclen)
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{
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int err;
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inflateReset (&stream);
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stream.next_in = src;
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stream.avail_in = srclen;
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stream.next_out = dst;
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stream.avail_out = 4096 * 2;
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err = inflate (&stream, Z_FINISH);
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if (err != Z_STREAM_END)
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goto err;
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return stream.total_out;
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err:
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/*printf ("Error %d while decompressing!\n", err); */
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/*printf ("%p(%d)->%p\n", src, srclen, dst); */
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return -1;
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}
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int cramfs_uncompress_init (void)
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{
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int err;
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stream.zalloc = zalloc;
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stream.zfree = zfree;
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stream.next_in = 0;
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stream.avail_in = 0;
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#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
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stream.outcb = (cb_func) WATCHDOG_RESET;
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#else
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stream.outcb = Z_NULL;
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#endif /* CONFIG_HW_WATCHDOG */
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err = inflateInit (&stream);
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if (err != Z_OK) {
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printf ("Error: inflateInit2() returned %d\n", err);
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return -1;
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}
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return 0;
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}
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int cramfs_uncompress_exit (void)
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{
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inflateEnd (&stream);
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return 0;
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}
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#endif /* CFG_FS_CRAMFS */
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