fat.c revision f79b2dff1024db4f6326f3422236bed169dd902f 
1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <assert.h>
18#include <string.h>
19
20#include <sys/endian.h>
21
22#include "fat.h"
23
24const char FAT_BOOT_SIG[] = { 0x55, 0xAA };
25const char FAT_INFO_SIG1[4] = { 'R', 'R', 'a', 'A' };
26const char FAT_INFO_SIG2[4] = { 'r', 'r', 'A', 'a' };
27
28void fat_dirent_set_first_cluster(struct fat_dirent *de, cluster_t cluster) {
29	assert(de);
30
31	de->first_cluster_hi = htole16((cluster >> 16) & 0xffff);
32	de->first_cluster_lo = htole16((cluster >>  0) & 0xffff);
33}
34
35void fat_dirent_set(struct fat_dirent *de,
36                    char *name, uint8_t attr,
37                    cluster_t first_cluster, uint32_t size) {
38	assert(de);
39	assert(name);
40
41	memset(de, 0, sizeof(*de));
42
43	memcpy(de->name, name, 11);
44	de->attr = attr;
45	fat_dirent_set_first_cluster(de, first_cluster);
46	de->size = htole32(size);
47}
48