1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2006 Tobias Reifenberger 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/types.h> 30 31 /* 32 * Conversion macros for little endian encoded unsigned integers 33 * in byte streams to the local unsigned integer format. 34 */ 35 #define UINT16BYTES(p) ((uint32_t)((p)[0] + (256*(p)[1]))) 36 #define UINT32BYTES(p) ((uint32_t)((p)[0] + (256*(p)[1]) + \ 37 (65536*(p)[2]) + (16777216*(p)[3]))) 38 39 /* 40 * All following structures are according to: 41 * 42 * Microsoft Extensible Firmware Initiative FAT32 File System Specification 43 * FAT: General Overview of On-Disk Format 44 * Version 1.03, December 6, 2000 45 * Microsoft Corporation 46 */ 47 48 /* 49 * FAT boot sector and boot parameter block for 50 * FAT12 and FAT16 volumes 51 */ 52 typedef struct fat_bsbpb { 53 /* common fields */ 54 uint8_t BS_jmpBoot[3]; 55 uint8_t BS_OEMName[8]; 56 uint8_t BPB_BytsPerSec[2]; 57 uint8_t BPB_SecPerClus; 58 uint8_t BPB_RsvdSecCnt[2]; 59 uint8_t BPB_NumFATs; 60 uint8_t BPB_RootEntCnt[2]; 61 uint8_t BPB_TotSec16[2]; 62 uint8_t BPB_Media; 63 uint8_t BPB_FATSz16[2]; 64 uint8_t BPB_SecPerTrack[2]; 65 uint8_t BPB_NumHeads[2]; 66 uint8_t BPB_HiddSec[4]; 67 uint8_t BPB_TotSec32[4]; 68 /* FAT12/FAT16 only fields */ 69 uint8_t BS_DrvNum; 70 uint8_t BS_Reserved1; 71 uint8_t BS_BootSig; 72 uint8_t BS_VolID[4]; 73 uint8_t BS_VolLab[11]; 74 uint8_t BS_FilSysType[8]; 75 } FAT_BSBPB; /* 62 bytes */ 76 77 /* 78 * FAT boot sector and boot parameter block for 79 * FAT32 volumes 80 */ 81 typedef struct fat32_bsbpb { 82 /* common fields */ 83 uint8_t BS_jmpBoot[3]; 84 uint8_t BS_OEMName[8]; 85 uint8_t BPB_BytsPerSec[2]; 86 uint8_t BPB_SecPerClus; 87 uint8_t BPB_RsvdSecCnt[2]; 88 uint8_t BPB_NumFATs; 89 uint8_t BPB_RootEntCnt[2]; 90 uint8_t BPB_TotSec16[2]; 91 uint8_t BPB_Media; 92 uint8_t BPB_FATSz16[2]; 93 uint8_t BPB_SecPerTrack[2]; 94 uint8_t BPB_NumHeads[2]; 95 uint8_t BPB_HiddSec[4]; 96 uint8_t BPB_TotSec32[4]; 97 /* FAT32 only fields */ 98 uint8_t BPB_FATSz32[4]; 99 uint8_t BPB_ExtFlags[2]; 100 uint8_t BPB_FSVer[2]; 101 uint8_t BPB_RootClus[4]; 102 uint8_t BPB_FSInfo[2]; 103 uint8_t BPB_BkBootSec[2]; 104 uint8_t BPB_Reserved[12]; 105 uint8_t BS_DrvNum; 106 uint8_t BS_Reserved1; 107 uint8_t BS_BootSig; 108 uint8_t BS_VolID[4]; 109 uint8_t BS_VolLab[11]; 110 uint8_t BS_FilSysType[8]; 111 } FAT32_BSBPB; /* 90 bytes */ 112 113 /* 114 * FAT directory entry structure 115 */ 116 #define FAT_DES_ATTR_READ_ONLY 0x01 117 #define FAT_DES_ATTR_HIDDEN 0x02 118 #define FAT_DES_ATTR_SYSTEM 0x04 119 #define FAT_DES_ATTR_VOLUME_ID 0x08 120 #define FAT_DES_ATTR_DIRECTORY 0x10 121 #define FAT_DES_ATTR_ARCHIVE 0x20 122 #define FAT_DES_ATTR_LONG_NAME (FAT_DES_ATTR_READ_ONLY | \ 123 FAT_DES_ATTR_HIDDEN | \ 124 FAT_DES_ATTR_SYSTEM | \ 125 FAT_DES_ATTR_VOLUME_ID) 126 127 typedef struct fat_des { 128 uint8_t DIR_Name[11]; 129 uint8_t DIR_Attr; 130 uint8_t DIR_NTRes; 131 uint8_t DIR_CrtTimeTenth; 132 uint8_t DIR_CrtTime[2]; 133 uint8_t DIR_CrtDate[2]; 134 uint8_t DIR_LstAccDate[2]; 135 uint8_t DIR_FstClusHI[2]; 136 uint8_t DIR_WrtTime[2]; 137 uint8_t DIR_WrtDate[2]; 138 uint8_t DIR_FstClusLO[2]; 139 uint8_t DIR_FileSize[4]; 140 } FAT_DES; 141