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buffer.h
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/
buffer.h
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/** \file buffer.h
* Global buffer for file I/O.
* Supported data types: Raw buffer, FAT entries.
*/
#include "Arduino.h"
#ifndef BUFFER_H
#define BUFFER_H
//typedef unsigned char byte; /**< 8 bits, unsigned */
//typedef unsigned short unsigned short; /**< 16 bits (make sure!), unsigned */
typedef unsigned long u_32; /**< 32 bits (make sure!), unsigned */
/** FAT/VFAT directory record union */
union DirRecordUnion {
/** Standard directory entry */
struct Entry {
byte Name[11];
byte Attr;
byte NTRes;
byte CrtTimeTenth;
unsigned short CrtTime;
unsigned short CrtDate;
unsigned short LstAccDate;
unsigned short FstClusHi;
unsigned short WrtTime;
unsigned short WrtDate;
unsigned short FstClusLo;
u_32 FileSize;
} entry;
#if 0
/** Extended directory entry */
struct LongEntry {
byte Ord;
unsigned short Name1[5]; /**< characters 1-5 */
byte Attr;
byte Type; /**< entry type, zero=long name component */
byte Chksum;
unsigned short Name2[6]; /**< characters 6-11 */
unsigned short FstClusLO; /**< zero for long entry */
unsigned short Name3[2]; /**< characters 12-13 */
} longentry;
#endif
};
/** FAT/VFAT directory record type */
typedef union DirRecordUnion dirrecordtype;
typedef struct FatInfo {
byte BS_jmpBoot[3]; /**< x86 Boot Jump Code */
byte BS_OEMName[8]; /**< Formatter's name, usually "MSWIN4.1" */
unsigned short BPB_BytsPerSec; /**< Bytes per sector (512) */
byte BPB_SecPerClus; /**< Sectors per Cluster (1,2,4,8,..,128) */
unsigned short BPB_RsvdSecCnt; /**< Reserved sectors (1 (32 for FAT32)) */
byte BPB_NumFATs; /**< Number of FATs (2) */
unsigned short BPB_RootEntCnt; /**< FAT12/16 n of root dir entries */
u_32 BPB_TotSec16; /**< Old sector count (0 for FAT32) */
byte BPB_Media; /**< Media Type (eg 0xF8) */
unsigned short BPB_FATSz16; /**< Size of one FAT16 in sectors */
unsigned short BPB_SecPerTrk; /**< Old CHS Sectors Per Track */
unsigned short BPB_NumHeads; /**< Old CSH Number of Heads */
u_32 BPB_HiddSec; /**< n of sectors before this volume */
u_32 BPB_TotSec32; /**< New sector count (0 for FAT12/16) */
/** FAT type specific extensions */
union ExtensionsInfo{
/** FAT12/16 specific extensions to Bios Parameter Block*/
struct Fat16SpecificInfo {
byte BS_DrvNum; /**< DOS INT13 Drive Number (0x80=HD)*/
byte BS_Reserved1; /**< For WINNT; Format to 0 */
byte BS_BootSig; /**< 0x29 if next 3 fields are present */
byte BS_VolID[4]; /**< Volume ID (usually format datetime) */
byte BS_VolLab[11]; /**< Volume Label */
byte BS_FilSysType[8]; /**< Decorative name of fs, eg "FAT16 "*/
} _16;
/** FAT32 specific extensions to Bios Parameter Block*/
struct Fat32SpecificInfo {
u_32 BPB_FATSz32; /**< Size of one FAT32 in sectors */
unsigned short BPB_ExtFlags; /**< Flags; active FAT number etc */
unsigned short BPB_FSVer; /**< File System Version (0x0000) */
u_32 BPB_RootClus; /**< Start cluster of Root Dir. (2) */
unsigned short BPB_FSInfo; /**< Start sector of FSINFO in Resvd area */
unsigned short BPB_BkBootSec; /**< Sector in Resvd area for BkBoot (6) */
byte BPB_Reserved[12]; /**< Reserved, Always 0. */
byte BS_DrvNum; /**< DOS INT13 Drive Number (0x80=HD) */
byte BS_Reserved1; /**< For WINNT, Format to 0 */
byte BS_BootSig; /**< 0x29 if next 3 fields are present */
byte BS_VolID[4]; /**< Volume ID (usually format datetime) */
byte BS_VolLab[11]; /**< Volume Label */
byte BS_FilSysType[8]; /**< Decorative name of fs, eg "FAT32 "*/
} _32;
} ext;
} FatType;
/** Disk Block type including RAW data and FAT deciphering structures. */
/* FAT structure definition from Microsoft's FAT32 File System
* Specification, version 1.03. Always use 512 byte disk block. */
typedef union DiskBlock {
/** Boot Sector / Bios Parameter Block structure*/
struct Fat {
byte BS_jmpBoot[3]; /**< x86 Boot Jump Code */
byte BS_OEMName[8]; /**< Formatter's name, usually "MSWIN4.1" */
unsigned short BPB_BytsPerSec; /**< Bytes per sector (512) */
byte BPB_SecPerClus; /**< Sectors per Cluster (1,2,4,8,..,128) */
unsigned short BPB_RsvdSecCnt; /**< Reserved sectors (1 (32 for FAT32)) */
byte BPB_NumFATs; /**< Number of FATs (2) */
unsigned short BPB_RootEntCnt; /**< FAT12/16 n of root dir entries */
unsigned short BPB_TotSec16; /**< Old sector count (0 for FAT32) */
byte BPB_Media; /**< Media Type (eg 0xF8) */
unsigned short BPB_FATSz16; /**< Size of one FAT16 in sectors */
unsigned short BPB_SecPerTrk; /**< Old CHS Sectors Per Track */
unsigned short BPB_NumHeads; /**< Old CSH Number of Heads */
u_32 BPB_HiddSec; /**< n of sectors before this volume */
u_32 BPB_TotSec32; /**< New sector count (0 for FAT12/16) */
/** FAT type specific extensions */
union Extensions{
/** FAT12/16 specific extensions to Bios Parameter Block*/
struct Fat16Specific {
byte BS_DrvNum; /**< DOS INT13 Drive Number (0x80=HD)*/
byte BS_Reserved1; /**< For WINNT; Format to 0 */
byte BS_BootSig; /**< 0x29 if next 3 fields are present */
byte BS_VolID[4]; /**< Volume ID (usually format datetime) */
byte BS_VolLab[11]; /**< Volume Label */
byte BS_FilSysType[8]; /**< Decorative name of fs, eg "FAT16 "*/
} _16;
/** FAT32 specific extensions to Bios Parameter Block*/
struct Fat32Specific {
u_32 BPB_FATSz32; /**< Size of one FAT32 in sectors */
unsigned short BPB_ExtFlags; /**< Flags; active FAT number etc */
unsigned short BPB_FSVer; /**< File System Version (0x0000) */
u_32 BPB_RootClus; /**< Start cluster of Root Dir. (2) */
unsigned short BPB_FSInfo; /**< Start sector of FSINFO in Resvd area */
unsigned short BPB_BkBootSec; /**< Sector in Resvd area for BkBoot (6) */
byte BPB_Reserved[12]; /**< Reserved, Always 0. */
byte BS_DrvNum; /**< DOS INT13 Drive Number (0x80=HD) */
byte BS_Reserved1; /**< For WINNT, Format to 0 */
byte BS_BootSig; /**< 0x29 if next 3 fields are present */
byte BS_VolID[4]; /**< Volume ID (usually format datetime) */
byte BS_VolLab[11]; /**< Volume Label */
byte BS_FilSysType[8]; /**< Decorative name of fs, eg "FAT32 "*/
} _32;
} ext;
} fat;
/** Raw Data (interpret sector as array of 8-bit chars)*/
struct Raw {
byte buf[512]; /**< Raw Data */
} raw;
/** Interpret sector as directory records */
dirrecordtype dir[16];
/** Interpret sector as array of 16-bit integers */
unsigned short Fat16Table[256];
/** Interpret sector as array of 32-bit integers */
u_32 Fat32Table[128];
} DiskBlockType;
/** 32-bit data type that is also "byte addressable".
* \warning Byte order is for LITTLE-ENDIAN ARCHITECTURES, change
* byte order for big-endian compilers/architectures! */
union Address {
unsigned long l;
struct B {
unsigned char b0;
unsigned char b1;
unsigned char b2;
unsigned char b3;
} b;
};
/** Address type */
typedef union Address addressType;
/** Dirty but powerful global variable that is used for
* 1) remembering which sector is in the RAM disk buffer diskSect and
* 2) possibly other weird and dirty purposes, be very careful with this!
*/
extern addressType sectorAddress;
/** File I/O buffer */
extern DiskBlockType diskSect;
extern FatType fatInfo;
/** Global Data Buffer pointer
* Used mainly for filling the buffer and reading MP3 data to send to
* the codec, be very careful with what you do with this global pointer!
*/
extern unsigned char *dataBufPtr;
#endif