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