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 <malloc.h> 25 #include <watchdog.h> 26 #include <u-boot/zlib.h> 27 28 static z_stream stream; 29 30 /* Returns length of decompressed data. */ 31 int cramfs_uncompress_block (void *dst, void *src, int srclen) 32 { 33 int err; 34 35 inflateReset (&stream); 36 37 stream.next_in = src; 38 stream.avail_in = srclen; 39 40 stream.next_out = dst; 41 stream.avail_out = 4096 * 2; 42 43 err = inflate (&stream, Z_FINISH); 44 45 if (err != Z_STREAM_END) 46 goto err; 47 return stream.total_out; 48 49 err: 50 /*printf ("Error %d while decompressing!\n", err); */ 51 /*printf ("%p(%d)->%p\n", src, srclen, dst); */ 52 return -1; 53 } 54 55 int cramfs_uncompress_init (void) 56 { 57 int err; 58 59 stream.zalloc = gzalloc; 60 stream.zfree = gzfree; 61 stream.next_in = 0; 62 stream.avail_in = 0; 63 64 #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG) 65 stream.outcb = (cb_func) WATCHDOG_RESET; 66 #else 67 stream.outcb = Z_NULL; 68 #endif /* CONFIG_HW_WATCHDOG */ 69 70 err = inflateInit (&stream); 71 if (err != Z_OK) { 72 printf ("Error: inflateInit2() returned %d\n", err); 73 return -1; 74 } 75 76 return 0; 77 } 78 79 int cramfs_uncompress_exit (void) 80 { 81 inflateEnd (&stream); 82 return 0; 83 } 84
