HustBase/PF_Manager.h at master · PancrasL/HustBase · GitHub

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#ifndef PF_MANAGER_H_H
#define PF_MANAGER_H_H

#include <stdio.h>
#include <io.h>
#include <fcntl.h>
#include <sys/types.h>

#include <sys/stat.h>
#include <string.h>
#include <time.h>
#include <malloc.h>
#include <windows.h>

#include "RC.h"

#define PF_PAGE_SIZE ((1<<12)-4)
#define PF_FILESUBHDR_SIZE (sizeof(PF_FileSubHeader))
#define PF_BUFFER_SIZE 50//Ò³Ãæ»º³åÇøµÄ´óÐ¡
#define PF_PAGESIZE (1<<12)
typedef unsigned int PageNum;

typedef struct {
	PageNum pageNum;
	char pData[PF_PAGE_SIZE];
}Page;

typedef struct {
	PageNum pageCount;
	int nAllocatedPages;
}PF_FileSubHeader;

typedef struct {
	bool bDirty;
	unsigned int pinCount;
	clock_t  accTime;
	char *fileName;
	int fileDesc;
	Page page;
}Frame;

typedef struct {
	bool bopen;
	char *fileName;
	int fileDesc;
	Frame *pHdrFrame;
	Page *pHdrPage;
	char *pBitmap;
	PF_FileSubHeader *pFileSubHeader;
}PF_FileHandle;

typedef struct {
	int nReads;
	int nWrites;
	Frame frame[PF_BUFFER_SIZE];
	bool allocated[PF_BUFFER_SIZE];
}BF_Manager;

typedef struct {
	bool bOpen;
	Frame *pFrame;
}PF_PageHandle;

const RC CreateFile(const char *fileName);
const RC openFile(char *fileName, PF_FileHandle *fileHandle);
const RC CloseFile(PF_FileHandle *fileHandle);

const RC GetThisPage(PF_FileHandle *fileHandle, PageNum pageNum, PF_PageHandle *pageHandle);
const RC AllocatePage(PF_FileHandle *fileHandle, PF_PageHandle *pageHandle);
const RC GetPageNum(PF_PageHandle *pageHandle, PageNum *pageNum);

const RC GetData(PF_PageHandle *pageHandle, char **pData);
const RC DisposePage(PF_FileHandle *fileHandle, PageNum pageNum);

const RC MarkDirty(PF_PageHandle *pageHandle);

const RC UnpinPage(PF_PageHandle *pageHandle);

#endif