fat.h revision f79b2dff1024db4f6326f3422236bed169dd902f
1f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle/* 2f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle * Copyright (C) 2010 The Android Open Source Project 3f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle * 4f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle * Licensed under the Apache License, Version 2.0 (the "License"); 5f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle * you may not use this file except in compliance with the License. 6f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle * You may obtain a copy of the License at 7f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle * 8f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle * http://www.apache.org/licenses/LICENSE-2.0 9f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle * 10f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle * Unless required by applicable law or agreed to in writing, software 11f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle * distributed under the License is distributed on an "AS IS" BASIS, 12f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle * See the License for the specific language governing permissions and 14f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle * limitations under the License. 15f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle */ 16f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle 17f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle#ifndef FAT_H 18f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle#define FAT_H 19f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle 20f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle#include <stdint.h> 21f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle 22f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle#include "types.h" 23f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle 24f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttletypedef uint64_t sector_t; 25f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttletypedef cluster_t fat_entry_t; 26f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle 27f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttlestruct fat_boot_sector { 28f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint8_t jump[3]; 29f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle char name[8]; 30f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint16_t sector_size; 31f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint8_t sectors_per_cluster; 32f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint16_t reserved_sectors; 33f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint8_t fats; 34f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint16_t rootdir_size; 35f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint16_t sectors16; 36f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint8_t media_desc; 37f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint16_t fat_sectors16; 38f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint16_t sectors_per_track; 39f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint16_t heads; 40f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint32_t hidden_sectors; 41f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint32_t sectors32; 42f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint32_t fat_sectors32; 43f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint16_t fat_flags; 44f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint16_t version; 45f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle cluster_t rootdir_start; 46f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint16_t fs_info_sector; 47f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint16_t backup_boot_sector; 48f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint8_t reserved1[12]; 49f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint8_t phys_drive; 50f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint8_t reserved2; 51f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint8_t ext_boot_sig; 52f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint32_t serial; 53f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle char vol_label[11]; 54f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle char type[8]; 55f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle char boot_code[420]; 56f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint8_t boot_sig[2]; 57f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle} __attribute__((__packed__)); 58f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle 59f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle#define FAT_MEDIA_DESC_FIXED 0xF8 60f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle 61f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle#define FAT_PHYS_DRIVE_REMOVABLE 0x00 62f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle#define FAT_PHYS_DRIVE_FIXED 0x80 63f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle 64f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle#define FAT_EXT_BOOT_SIG 0x29 65f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle 66f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttleextern const char FAT_BOOT_SIG[2]; 67f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle 68f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttleextern const char FAT_INFO_SIG1[4]; 69f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttleextern const char FAT_INFO_SIG2[4]; 70f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle#define FAT_INFO_SIG3 FAT_BOOT_SIG 71f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle 72f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttlestruct fat_info_sector { 73f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle char info_sig1[4]; 74f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle char reserved1[480]; 75f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle char info_sig2[4]; 76f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle cluster_t free_clusters; 77f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle cluster_t last_cluster; 78f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle char reserved2[14]; 79f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle char info_sig3[2]; 80f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle} __attribute__((__packed__)); 81f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle 82f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttlestruct fat_bootinfo { 83f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle struct fat_boot_sector boot; 84f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle struct fat_info_sector info; 85f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle} __attribute__((__packed__)); 86f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle 87f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttlestruct fat_dirent { 88f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle char name[11]; 89f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint8_t attr; 90f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint8_t reserved; 91f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint8_t ctime_ms; 92f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint16_t ctime; 93f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint16_t cdate; 94f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint16_t adate; 95f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint16_t first_cluster_hi; 96f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint16_t mtime; 97f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint16_t mdate; 98f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint16_t first_cluster_lo; 99f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle uint32_t size; 100f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle} __attribute__((__packed__)); 101f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle 102f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle#define FAT_ATTR_READONLY 0x01 103f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle#define FAT_ATTR_HIDDEN 0x02 104f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle#define FAT_ATTR_SYSTEM 0x04 105f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle#define FAT_ATTR_VOLLABEL 0x08 106f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle#define FAT_ATTR_SUBDIR 0x10 107f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle#define FAT_ATTR_ARCHIVE 0x20 108f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle#define FAT_ATTR_DEVICE 0x40 109f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle 110f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle#define FAT_ENTRY_FREE 0x00000000 111f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle#define FAT_ENTRY_BAD 0x0FFFFFF7 112f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle#define FAT_ENTRY_EOC 0x0FFFFFF8 113f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle 114f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle#define FAT_SECTOR_SIZE 512 115f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle#define FAT_CLUSTER_ZERO 2 116f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle#define FAT_ENTRIES_PER_SECTOR ((SECTOR_SIZE) / (sizeof(fat_entry_t))) 117f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle 118f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttlevoid fat_dirent_set_first_cluster(struct fat_dirent *de, cluster_t cluster); 119f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttlevoid fat_dirent_set(struct fat_dirent *de, 120f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle char *name, uint8_t attr, 121f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle cluster_t first_cluster, uint32_t size); 122f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle 123f79b2dff1024db4f6326f3422236bed169dd902fThomas Tuttle#endif 124