1/* 2 * uncompress.c 3 * 4 * Copyright (C) 1999 Linus Torvalds 5 * Copyright (C) 2000-2002 Transmeta Corporation 6 * 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. 10 * 11 * cramfs interfaces to the uncompression library. There's really just 12 * three entrypoints: 13 * 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. 17 * 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. 21 */ 22 23#include <common.h> 24#include <cyclic.h> 25#include <malloc.h> 26#include <watchdog.h> 27#include <u-boot/zlib.h> 28 29static z_stream stream; 30 31/* Returns length of decompressed data. */ 32int cramfs_uncompress_block (void *dst, void *src, int srclen) 33{ 34 int err; 35 36 inflateReset (&stream); 37 38 stream.next_in = src; 39 stream.avail_in = srclen; 40 41 stream.next_out = dst; 42 stream.avail_out = 4096 * 2; 43 44 err = inflate (&stream, Z_FINISH); 45 46 if (err != Z_STREAM_END) 47 goto err; 48 return stream.total_out; 49 50 err: 51 /*printf ("Error %d while decompressing!\n", err); */ 52 /*printf ("%p(%d)->%p\n", src, srclen, dst); */ 53 return -1; 54} 55 56int cramfs_uncompress_init (void) 57{ 58 int err; 59 60 stream.zalloc = gzalloc; 61 stream.zfree = gzfree; 62 stream.next_in = 0; 63 stream.avail_in = 0; 64 65#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG) 66 stream.outcb = (cb_func)cyclic_run; 67#else 68 stream.outcb = Z_NULL; 69#endif /* CONFIG_HW_WATCHDOG */ 70 71 err = inflateInit (&stream); 72 if (err != Z_OK) { 73 printf ("Error: inflateInit2() returned %d\n", err); 74 return -1; 75 } 76 77 return 0; 78} 79 80int cramfs_uncompress_exit (void) 81{ 82 inflateEnd (&stream); 83 return 0; 84} 85