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/*-
* Copyright (c) 2006 Tobias Reifenberger
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/types.h>
/*
* Conversion macros for little endian encoded unsigned integers
* in byte streams to the local unsigned integer format.
*/
#define UINT16BYTES(p) ((uint32_t)((p)[0] + (256*(p)[1])))
#define UINT32BYTES(p) ((uint32_t)((p)[0] + (256*(p)[1]) + \
(65536*(p)[2]) + (16777216*(p)[3])))
/*
* All following structures are according to:
*
* Microsoft Extensible Firmware Initiative FAT32 File System Specification
* FAT: General Overview of On-Disk Format
* Version 1.03, December 6, 2000
* Microsoft Corporation
*/
/*
* FAT boot sector and boot parameter block for
* FAT12 and FAT16 volumes
*/
typedef struct fat_bsbpb {
/* common fields */
uint8_t BS_jmpBoot[3];
uint8_t BS_OEMName[8];
uint8_t BPB_BytsPerSec[2];
uint8_t BPB_SecPerClus;
uint8_t BPB_RsvdSecCnt[2];
uint8_t BPB_NumFATs;
uint8_t BPB_RootEntCnt[2];
uint8_t BPB_TotSec16[2];
uint8_t BPB_Media;
uint8_t BPB_FATSz16[2];
uint8_t BPB_SecPerTrack[2];
uint8_t BPB_NumHeads[2];
uint8_t BPB_HiddSec[4];
uint8_t BPB_TotSec32[4];
/* FAT12/FAT16 only fields */
uint8_t BS_DrvNum;
uint8_t BS_Reserved1;
uint8_t BS_BootSig;
uint8_t BS_VolID[4];
uint8_t BS_VolLab[11];
uint8_t BS_FilSysType[8];
} FAT_BSBPB; /* 62 bytes */
/*
* FAT boot sector and boot parameter block for
* FAT32 volumes
*/
typedef struct fat32_bsbpb {
/* common fields */
uint8_t BS_jmpBoot[3];
uint8_t BS_OEMName[8];
uint8_t BPB_BytsPerSec[2];
uint8_t BPB_SecPerClus;
uint8_t BPB_RsvdSecCnt[2];
uint8_t BPB_NumFATs;
uint8_t BPB_RootEntCnt[2];
uint8_t BPB_TotSec16[2];
uint8_t BPB_Media;
uint8_t BPB_FATSz16[2];
uint8_t BPB_SecPerTrack[2];
uint8_t BPB_NumHeads[2];
uint8_t BPB_HiddSec[4];
uint8_t BPB_TotSec32[4];
/* FAT32 only fields */
uint8_t BPB_FATSz32[4];
uint8_t BPB_ExtFlags[2];
uint8_t BPB_FSVer[2];
uint8_t BPB_RootClus[4];
uint8_t BPB_FSInfo[2];
uint8_t BPB_BkBootSec[2];
uint8_t BPB_Reserved[12];
uint8_t BS_DrvNum;
uint8_t BS_Reserved1;
uint8_t BS_BootSig;
uint8_t BS_VolID[4];
uint8_t BS_VolLab[11];
uint8_t BS_FilSysType[8];
} FAT32_BSBPB; /* 90 bytes */
/*
* FAT directory entry structure
*/
#define FAT_DES_ATTR_READ_ONLY 0x01
#define FAT_DES_ATTR_HIDDEN 0x02
#define FAT_DES_ATTR_SYSTEM 0x04
#define FAT_DES_ATTR_VOLUME_ID 0x08
#define FAT_DES_ATTR_DIRECTORY 0x10
#define FAT_DES_ATTR_ARCHIVE 0x20
#define FAT_DES_ATTR_LONG_NAME (FAT_DES_ATTR_READ_ONLY | \
FAT_DES_ATTR_HIDDEN | \
FAT_DES_ATTR_SYSTEM | \
FAT_DES_ATTR_VOLUME_ID)
typedef struct fat_des {
uint8_t DIR_Name[11];
uint8_t DIR_Attr;
uint8_t DIR_NTRes;
uint8_t DIR_CrtTimeTenth;
uint8_t DIR_CrtTime[2];
uint8_t DIR_CrtDate[2];
uint8_t DIR_LstAccDate[2];
uint8_t DIR_FstClusHI[2];
uint8_t DIR_WrtTime[2];
uint8_t DIR_WrtDate[2];
uint8_t DIR_FstClusLO[2];
uint8_t DIR_FileSize[4];
} FAT_DES;
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