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