Function MD5File

md5utils.c:71–113

! \brief * Calculate a MD5 digest over a file. * This function assumes 32 bytes in the destination buffer. * \param dest destination * \param file_name file for that the digest should be calculated * \return zero on success, negative on errors */

  * \return zero on success, negative on errors
  */
int MD5File(char *dest, const char *file_name)
{
	if (!dest || !file_name) {
		LM_ERR("invalid parameter value\n");
		return -1;
	}

	MD5_CTX context;
	FILE *input;
	char buffer[32768];
	char hash[16];
	unsigned int counter, size;

	struct stat stats;
    if (stat(file_name, &stats) != 0) {
		LM_ERR("could not stat file %s\n", file_name);
		return -1;
	}
	size = stats.st_size;

	MD5Init(&context);
	if((input = fopen(file_name, "rb")) == NULL) {
		LM_ERR("could not open file %s\n", file_name);
		return -1;
	}

	while(size) {
		counter = (size > sizeof(buffer)) ? sizeof(buffer) : size;
		if ((counter = fread(buffer, 1, counter, input)) <= 0) {
			fclose(input);
			return -1;
		}
		MD5Update(&context, buffer, counter);
		size -= counter;
	}
	fclose(input);
	MD5Final(hash, &context);

	string2hex(hash, 16, dest);
	LM_DBG("MD5 calculated: %.*s for file %s\n", MD5_LEN, dest, file_name);

	return 0;
}