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 #if (CONFIG_COMMANDS & CFG_CMD_JFFS2) 29 30 static z_stream stream; 31 32 #define ZALLOC_ALIGNMENT 16 33 34 static void *zalloc (void *x, unsigned items, unsigned size) 35 { 36 void *p; 37 38 size *= items; 39 size = (size + ZALLOC_ALIGNMENT - 1) & ~(ZALLOC_ALIGNMENT - 1); 40 41 p = malloc (size); 42 43 return (p); 44 } 45 46 static void zfree (void *x, void *addr, unsigned nb) 47 { 48 free (addr); 49 } 50 51 /* Returns length of decompressed data. */ 52 int cramfs_uncompress_block (void *dst, void *src, int srclen) 53 { 54 int err; 55 56 inflateReset (&stream); 57 58 stream.next_in = src; 59 stream.avail_in = srclen; 60 61 stream.next_out = dst; 62 stream.avail_out = 4096 * 2; 63 64 err = inflate (&stream, Z_FINISH); 65 66 if (err != Z_STREAM_END) 67 goto err; 68 return stream.total_out; 69 70 err: 71 /*printf ("Error %d while decompressing!\n", err); */ 72 /*printf ("%p(%d)->%p\n", src, srclen, dst); */ 73 return -1; 74 } 75 76 int cramfs_uncompress_init (void) 77 { 78 int err; 79 80 stream.zalloc = zalloc; 81 stream.zfree = zfree; 82 stream.next_in = 0; 83 stream.avail_in = 0; 84 85 #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG) 86 stream.outcb = (cb_func) WATCHDOG_RESET; 87 #else 88 stream.outcb = Z_NULL; 89 #endif /* CONFIG_HW_WATCHDOG */ 90 91 err = inflateInit (&stream); 92 if (err != Z_OK) { 93 printf ("Error: inflateInit2() returned %d\n", err); 94 return -1; 95 } 96 97 return 0; 98 } 99 100 int cramfs_uncompress_exit (void) 101 { 102 inflateEnd (&stream); 103 return 0; 104 } 105 106 #endif /* CFG_FS_CRAMFS */ 107