piece.h

PDA上的CF CARD 文件系统的建立程式

#ifndef _RD_PIECE_H
#define _RD_PIECE_H


// piece data structure 
typedef struct piece_ds {
  void* startAddress;
  unsigned long size;
}PIECE_DS, *PPIECE_DS;


/*************************************************************
Function: initPieceParameters
Description:
	initialize the piece parameters
Input:
	NONE
Output:
	NONE
**************************************************************/
void initPieceParameters(void);



/*************************************************************
Function: initPLT
Description:
	initialize the PLT
Input:
	NONE
Output:
	NONE
**************************************************************/
void initPLT(void);



/*************************************************************
Function: getPiece
Description:
	get a piece from memory
Input:
	wantSize
Output:
	the pointer to the head of the piece
	NULL if failed
**************************************************************/
//void *getPiece(void);

void *getPiece(unsigned long wantSize);



/*************************************************************
Function: addNewPieceToFBL
Description:
	add a newly obtained piece to the free block list
Input:
	piece - the new piece
	size - the size of the piece
Output:
	NONE
**************************************************************/
//void addNewPieceToFBL(void *piece);

void addNewPieceToFBL(void *piece, unsigned long size);



/*************************************************************
Function: freePiece
Description:
	free a piece to memory
Input:
	piece - the target piece
Output:
	 0 if succeeded
	-1 if failed
**************************************************************/
int freePiece(void *piece);



/*************************************************************
Function: checkPieceFree
Description:
	check if the target piece is completely free
Input:
	piece - the target piece
Output:
	1 if totally free
	0 if not free
**************************************************************/
int checkPieceFree(void *piece);



/*************************************************************
Function: freeAllPieceNC
Description:
	free all pieces without checking whether they are totally unused
Input:
	index - freeing starts from this entry
Output:
	NONE
**************************************************************/
void freeAllPieceNC(int index);



/*************************************************************
Function: freeUnusedPiece
Description:
	free all unused pieces
Input:
	index - freeing starts from this entry
Output:
	number of pieces freed
**************************************************************/
int freeUnusedPiece(int index);



#endif