myvtm/Framework/spshell/md5file.cpp

#include "precompile.h"
#include <stdio.h>  
#include <stdlib.h>  
#include <string.h>  
  
#include "md5.h"  
  
char *MD5_file (char *path, int md5_len)  
{  
    FILE *fp = fopen (path, "rb");  
    MD5_CTX mdContext;  
    int bytes;  
    unsigned char data[1024];  
    char *file_md5;  
    int i;  
  
    if (fp == NULL) 
	{  
        fprintf (stderr, "fopen %s failed\n", path);  
        return NULL;  
    }  
  
    MD5Init (&mdContext);  
    while ((bytes = fread (data, 1, 1024, fp)) != 0)  
    {  
        MD5Update (&mdContext, data, bytes);  
    }  
    MD5Final (&mdContext);  
      
    file_md5 = (char *)malloc((md5_len + 1) * sizeof(char));  
    if(file_md5 == NULL)  
    {  
        fprintf(stderr, "malloc failed.\n");  
        return NULL;  
    }  
    memset(file_md5, 0, (md5_len + 1));  
      
    if(md5_len == 16)  
    {  
        for(i=4; i<12; i++)  
        {  
            sprintf(&file_md5[(i-4)*2], "%02x", mdContext.digest[i]);  
        }  
    }  
    else if(md5_len == 32)  
    {  
        for(i=0; i<16; i++)  
        {  
            sprintf(&file_md5[i*2], "%02x", mdContext.digest[i]);  
        }  
    }  
    else  
    {  
        fclose(fp);  
        free(file_md5);  
        return NULL;  
    }  
      
    fclose (fp);  
    return file_md5;  
}