文件切割

王朝other·作者佚名  2006-01-08
窄屏简体版  字體: |||超大  

下面是切割文件和合并文件的代码,是我用来熟悉文件操作函数时写的一些东西,大有完善的余地,与大家分享,听取大家指教。程序在UNIX_AIX下调试通过。

/***************************

mycut.c

文件切割程序

用于将文件切割成1024字节大小的小文件

***************************/

#include<stdio.h>

#include<stdlib.h>

#include<sys/stat.h>

#define SIZE 1024

#define MAX 1048576*5

main(int argc, char **argv)

{

char buffer[SIZE],c;

FILE *source, *target;

struct stat sbuf;

int count = 0, n = 0;

char flag = '0';

char mycount[10];

char parts[10];

char mysign[20];

if(argc != 2)

{

fprintf(stderr, "Usage: source--file\n", *argv);

exit(1);

}

if((source = fopen(argv[1],"r")) == NULL)

{

perror(argv[1]);

exit(1);

}

stat(argv[1], &sbuf);

if(sbuf.st_size > MAX)

{

printf("the file is too big \n");

exit(0);

}

/*计算文件的块数*/

count = sbuf.st_size / SIZE + 1;

memset(mysign, 0, 10);

printf("%d\n", count);

/*记录文件个数*/

target = fopen("thecount","w");

sprintf(mysign, "%d", count);

fputs(mysign, target);

fclose(target);

/*记录文件名*/

target = fopen("thefilename","w");

fputs(argv[1], target);

fclose(target);

for(flag=0; flag<count; flag++)

{

sprintf(mysign,"%d",flag);

printf("%s",mysign);

target = fopen(mysign, "w");

n = fread(buffer, sizeof(char), SIZE, source);

fwrite(buffer, sizeof(char), n, target);

fclose(target);

}

fclose(source);

exit(0);

}

/***************************

mycomb.c

文件合并程序

用于将用上面程序切割的小文件合并复原

***************************/

#include<stdio.h>

#include<stdlib.h>

#include<sys/stat.h>

#define SIZE 1024

#define MAX 1048576*5

main(int argc, char **argv)

{

char buffer[SIZE],c;

FILE *source, *target;

struct stat sbuf;

int count = 0, n = 0;

char flag = '0';

char mycount[10];

char filename[20];

char mysign[10];

/*获得文件块数信息*/

if((source = fopen("thecount","r")) == NULL)

{

printf("some thing is wrong\n");

exit(1);

}

memset(mycount, 0, 10);

fgets(mycount,10,source );

fclose(source);

remove("thecount");

count = atoi(mycount);

/*获得文件名信息*/

if((source = fopen("thefilename","r")) == NULL)

{

printf("some thing is wrong\n");

exit(1);

}

memset(filename, 0, 20);

fgets(filename,10,source );

fclose(source);

remove("thefilename");

target = fopen(filename,"a");

memset(mysign, 0 ,10);

/*文件合并*/

for(flag=0; flag<count; flag++)

{

sprintf(mysign,"%d",flag);

printf("%s",mysign);

source = fopen(mysign, "r");

n = fread(buffer, sizeof(char), SIZE, source);

fwrite(buffer, sizeof(char), n, target);

fclose(source);

remove(mysign);

}

fclose(target);

exit(0);

}

 
 
 
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