testhashfile.c

操作系统课程设计 有进程同步问题 内存管理 设备管理

/***************************************************************************
 *   Copyright (C) 2004 by root                                            *
 *   root@simplemepis                                                      *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdio.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>

#include "HashFile.h"
#include "jtRecord.h"
#define KEYOFFSET 0
#define KEYLEN sizeof(int)
#define FILENAME "jing.hash"


void showHashFile();
int main(int argc, char *argv[])
{
    struct jtRecord rec[6]=
        {
            {
                1,"jing"
            }
            ,{2,"wang"},{3,"li"},{4,"zhang"},{5,"qing"},{6,"yuan"}
        };
    int j=0;
    for(j=0;j<6;j++)
    {
        printf("<%d,%d>\t",rec[j].key,hash(KEYOFFSET,KEYLEN,&rec[j],6));
    }
    
    int fd=hashfile_creat(FILENAME,O_RDWR|O_CREAT,RECORDLEN,6);
    
    int i=0;
    printf("\nOpen ans Save Record...\n");
    fd=hashfile_open(FILENAME,O_RDWR,0);
    for(i=0;i<6;i++)
    {
        hashfile_saverec(fd,KEYOFFSET,KEYLEN,&rec[i]);
    }
    hashfile_close(fd);
    showHashFile();
    
    //Demo find Rec
    printf("\nFind Record...");
    fd=hashfile_open(FILENAME,O_RDWR,0);
    int offset=hashfile_findrec(fd,KEYOFFSET,KEYLEN,&rec[4]);
    printf("\noffset is %d\n",offset);
    hashfile_close(fd);
    struct jtRecord jt;
    struct CFTag tag;
    fd=open(FILENAME,O_RDWR);
    lseek(fd,offset,SEEK_SET);
    read(fd,&tag,sizeof(struct CFTag));
    printf("Tag is <%d,%d>\t",tag.collision,tag.free);
    read(fd,&jt,sizeof(struct jtRecord));
    printf("Record is {%d,%s}\n",jt.key,jt.other);
    
    //Demo Delete Rec
    printf("\nDelete Record...");
    fd=hashfile_open(FILENAME,O_RDWR,0);
    hashfile_delrec(fd,KEYOFFSET,KEYLEN,&rec[2]);
    hashfile_close(fd);
    showHashFile();
    
    //Demo Read
    fd=hashfile_open(FILENAME,O_RDWR,0);
    char buf[32];
    memcpy(buf,&rec[1],KEYLEN);
    hashfile_read(fd,KEYOFFSET,KEYLEN,buf);
    printf("\nRead Record is {%d,%s}\n",((struct jtRecord*)buf)->key,((struct jtRecord*)buf)->other);
    hashfile_close(fd);
   
    //Demo Write
    printf("\nWrite Record...");
    fd=hashfile_open(FILENAME,O_RDWR,0);
    hashfile_write(fd,KEYOFFSET,KEYLEN,&rec[3]);
    hashfile_close(fd);
    showHashFile();
    return 0;
}
void showHashFile()
{
    int fd;
    printf("\n");
    fd=open(FILENAME,O_RDWR);
    lseek(fd,sizeof(struct HashFileHeader),SEEK_SET);
    struct jtRecord jt;
    struct CFTag tag;
    while(1)
    {
        if (read(fd,&tag,sizeof(struct CFTag))<=0)
            break;
        printf("Tag is <%d,%d>\t",tag.collision,tag.free);
        if(read(fd,&jt,sizeof(struct jtRecord))<=0)
            break;
        printf("Record is {%d,%s}\n",jt.key,jt.other);
    }
    close(fd);
}