/* * 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_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 */