填充文件后面为0xFF到指定大小

以下程序可以填充文件后面全部为0xff到指定大小.

test.c

#include <stdio.h>

/*

* Return: 0, OK

* -1, Fail

*/

unsigned long int appendFile(char *destFilePath, unsigned long int appendLength)

{

unsigned char tmpBuf[1024];

int i = 0;

FILE *fp;

for(i = 0; i < 1024; i++)

{

tmpBuf[i] = 0xFF;

}

if ((fp = fopen(destFilePath, "ab+"))==NULL)

{

printf("Can not open file %s \n", destFilePath);

return -1;

}



while(appendLength > 0)

{

if (appendLength <= 1024)

{

fwrite(tmpBuf, sizeof(char), appendLength, fp);

appendLength -= appendLength;

}

else

{

fwrite(tmpBuf, sizeof(char), 1024, fp);

appendLength -= 1024;

}

}

fclose(fp);

return 0;

}

#define SRC_FILE "./file1.bin"

#define DEST_FILE "./file2.bin"

void main(void)

{

unsigned long int totalLength = (85504 - 13824) * 1024;

unsigned long int fileLength = 57751552;

unsigned long int appendLength = totalLength - fileLength;

appendFile(DEST_FILE, appendLength);

}