struct MsFileLock
 {
 BPTR fl_Link;
 LONG fl_Key;
 LONG fl_Access;
 struct MsgPort *fl_Task;
 BPTR fl_Volume;
 LONG MagicNum;
 LONG FirstDirBlock;
 LONG DirBlock;
 LONG DirPos;
 LONG FirstBlock;
 };

struct MsDosFile
 {
 LONG Used;
 LONG MagicNum;
 LONG FirstCluster;
 LONG BufferPosition;
 LONG Position;
 LONG FileLength;
 LONG ClusterPos;
 LONG BufferDirty;
 LONG LengthDirty;
 LONG LastCluster;
 LONG DirBlk;
 LONG DirPos;
 unsigned char Buffer[2048];
 };

struct DOSDIR
 {
 unsigned char FileName[8];
 unsigned char Extension[3];
 unsigned char Attribute;
 unsigned char Padding[10];
 short Time;
 short Date;
 short FirstCluster;
 long FileLength;
 };

#undef BADDR
#define BADDR(x) ((APTR) ((x)<<2))
#define AADDR(x) ((BPTR) ((x)>>2))
#define CSTR(x) (((char *) BADDR(x))+1)
#define ACTION_FIND_INPUT  1005
#define ACTION_FIND_OUTPUT 1006
#define ACTION_END		   1007
#define ACTION_SEEK		   1008
#define DOS_TRUE		   -1
#define DOS_FALSE		   0

#define MSDOSTYPE(x) ((x==TypeStandardAddress)||(x==TypeStandardData))
#define AMIGATYPE(x) (x==TypeAmigaDos)

#define FIRSTCLUSTER 26

#define MAXLOCKS 20
#define MAXFILES 5