Category : File Managers
Archive   : CASP421.ZIP
Filename : DOSSTRUC.H

#ifndef DOS_DATE
#define DOS_DATE
typedef union {
unsigned u;
struct {
unsigned Day:5;
unsigned Month:4;
unsigned Year:7;
} b;
} DOS_FILE_DATE;
#endif

#ifndef DOS_TIME
#define DOS_TIME
typedef union {
unsigned u;
struct {
unsigned Second:5;
unsigned Minute:6;
unsigned Hour:5;
} b;
} DOS_FILE_TIME;
#endif

/* DpbStruct -- Layout of parameter block returned by Int 21H, Fn 32H */
/* This function is an undocumented MS-DOS service but has */
/* been verified to work correctly on PC/MS-DOS 2.0 through */
/* PC/MS-DOS 3.3 */

struct DOS_2 {
unsigned char FatSize;
unsigned DirStart;
unsigned long ddh;
unsigned char MediaType;
unsigned char Rebuild;
unsigned long NextTable;
unsigned CurDir1st;
char CurDirPath[64];
};

struct DOS_3 {
unsigned char FatSize;
unsigned DirStart;
unsigned long ddh;
unsigned char MediaType;
unsigned char Rebuild;
unsigned long NextTable;
unsigned FreeSearchClus;
unsigned FreeCluster;
};

struct DOS_4 {
unsigned FatSize;
unsigned DirStart;
unsigned long ddh;
unsigned char MediaType;
unsigned char Rebuild;
unsigned long NextTable;
unsigned FreeSearchClus;
unsigned FreeCluster;
};

struct DpbStruct {
unsigned char Designator; /* Drive # (0=A, 1=B, ...) */
unsigned char AltDesignator; /* As above; 0 if RAMdisk */
unsigned SectorSize; /* Bytes per Sector */
unsigned char ClusterSize; /* Sectors per Cluster - 1 */
unsigned char ClusterShift; /* Log2 (Sectors per Clus) */
unsigned FatStart; /* Sectors in Boot Record */
unsigned char FatCopies; /* Copies of FAT */
unsigned MaxEntries; /* Max entries in Root Directory */
unsigned DataStart; /* 1st sector of data area */
unsigned LastCluster; /* Last cluster number */
union {
struct DOS_2 V2;
struct DOS_3 V3;
struct DOS_4 V4;
} V;
};


/*
* ExtendedHeader -- header used in constructing an extended file control
* block.
*/

struct ExtendedHeader {
char Header;
char Zeros[5];
char Attrib;
};
/* ExtFcb -- extended file control block */

struct ExtFcb {
struct ExtendedHeader FcbHdr;
char DriveId;
char FileName[8];
char FileExtension[3];
unsigned CurBlock;
unsigned RecSize;
long FileSize;
DOS_FILE_DATE Date;
DOS_FILE_TIME Time;
char Reserved[8];
char RecInBlock;
long RelRecord;
};
/*
* DirDta -- dta directory entry structure
*/

struct DirDta {
char DriveNum;
char FileName[11];
char Attributes;
char Unused[10];
DOS_FILE_TIME CreateTime;
DOS_FILE_DATE CreateDate;
unsigned FirstCluster;
long FileSize;
};
/*
* DirEntry -- format of an entry in the directory
*/

struct DirEntry {
unsigned char Name[8];
char Ext[3];
char Attribute;
char Reserved[10];
unsigned ModifyTime;
unsigned ModifyDate;
unsigned FirstCluster;
long FileSize;
};
/*
* ExtendedEntry -- directory structure for use with extended file search
*/

struct ExtendedEntry {
struct ExtendedHeader DirHdr;
struct DirDta Body;
};

struct ClusterEntry {
struct ClusterEntry *Next;
unsigned Cluster;
};

struct ClusterQueue {
struct ClusterEntry *Head, *Current;
int Count;
};


struct absr32m
{
long sector;
int nsect;
unsigned char far *xferad;
};

#define FAT_BLK 57344U
#define INT_FAT_BLK (FAT_BLK / 2)

#if defined(MAIN)
#define EXTERN
#else
#define EXTERN extern
#endif