hashfile.h

#include<unistd.h>
#include<sys/stat.h>
#define COLLISIONFACTOR 0.5
struct HashFileHeader
{
int sig;
int reclen; 
int total_rec_num;
int current_rec_num;  
};
struct CFTag
{
char collision; 
char free; 
};
int hashfile_creat(const char *filename,mode_t mode,int reclen,int total_rec_num);
//int hashfile_open(const char *filename,int flags); 
int hashfile_open(const char *filename,int flags,mode_t mode);
int hashfile_close(int fd);
int hashfile_read(int fd,int keyoffset,int keylen,void *buf);
int hashfile_write(int fd,int keyoffset,int keylen,void *buf);
int hashfile_delrec(int fd,int keyoffset,int keylen,void *buf);
int hashfile_findrec(int fd,int keyoffset,int keylen,void *buf);
int hashfile_saverec(int fd,int keyoffset,int keylen,void *buf);
int hash(int keyoffset,int keylen,void *buf,int total_rec_num);
int checkHashFileFull(int fd);
int readHashFileHeader(int fd,struct HashFileHeader *hfh);