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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 #include <endian.h>
20 
21 #include "fat.h"
22 
23 const char FAT_BOOT_SIG[] = { 0x55, 0xAA };
24 const char FAT_INFO_SIG1[4] = { 'R', 'R', 'a', 'A' };
25 const char FAT_INFO_SIG2[4] = { 'r', 'r', 'A', 'a' };
26 
fat_dirent_set_first_cluster(struct fat_dirent * de,cluster_t cluster)27 void fat_dirent_set_first_cluster(struct fat_dirent *de, cluster_t cluster)
28 {
29 	assert(de);
30 
31 	de->first_cluster_hi = htole16((cluster >> 16) & 0xffff);
32 	de->first_cluster_lo = htole16((cluster >>  0) & 0xffff);
33 }
34 
fat_dirent_set(struct fat_dirent * de,char * name,uint8_t attr,cluster_t first_cluster,uint32_t size)35 void fat_dirent_set(struct fat_dirent *de,
36                     char *name, uint8_t attr,
37                     cluster_t first_cluster, uint32_t size)
38 {
39 	assert(de);
40 	assert(name);
41 
42 	memset(de, 0, sizeof(*de));
43 
44 	memcpy(de->name, name, 11);
45 	de->attr = attr;
46 	fat_dirent_set_first_cluster(de, first_cluster);
47 	de->size = htole32(size);
48 }
49