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 <zlib.h> 27 28 static z_stream stream; 29 30 void *zalloc(void *, unsigned, unsigned); 31 void zfree(void *, void *, unsigned); 32 33 /* Returns length of decompressed data. */ 34 int cramfs_uncompress_block (void *dst, void *src, int srclen) 35 { 36 int err; 37 38 inflateReset (&stream); 39 40 stream.next_in = src; 41 stream.avail_in = srclen; 42 43 stream.next_out = dst; 44 stream.avail_out = 4096 * 2; 45 46 err = inflate (&stream, Z_FINISH); 47 48 if (err != Z_STREAM_END) 49 goto err; 50 return stream.total_out; 51 52 err: 53 /*printf ("Error %d while decompressing!\n", err); */ 54 /*printf ("%p(%d)->%p\n", src, srclen, dst); */ 55 return -1; 56 } 57 58 int cramfs_uncompress_init (void) 59 { 60 int err; 61 62 stream.zalloc = zalloc; 63 stream.zfree = zfree; 64 stream.next_in = 0; 65 stream.avail_in = 0; 66 67 #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG) 68 stream.outcb = (cb_func) WATCHDOG_RESET; 69 #else 70 stream.outcb = Z_NULL; 71 #endif /* CONFIG_HW_WATCHDOG */ 72 73 err = inflateInit (&stream); 74 if (err != Z_OK) { 75 printf ("Error: inflateInit2() returned %d\n", err); 76 return -1; 77 } 78 79 return 0; 80 } 81 82 int cramfs_uncompress_exit (void) 83 { 84 inflateEnd (&stream); 85 return 0; 86 } 87