/* Compares the digests of two files, calculating them if neccessary.
*/
static int compare_file_digests(File* first, File* second)
{
if (get_file_digest(first) != 0)
return -1;
if (get_file_digest(second) != 0)
return -1;
if (memcmp(first->digest, second->digest, get_digest_size()) != 0)
return -1;
return 0;
}
/* Generates the digest for the specified file if it's not already present.
*/
void generate_file_digest(File* file)
{
get_file_digest(file);
}
/* display or test the md5sum of the current map or the specified file */
int command_ckdata(char *text, int len)
{
const int DIGEST_LEN = 16;
Uint8 digest[DIGEST_LEN];
char digest_str[DIGEST_LEN*2+1];
char expected_digest_str[DIGEST_LEN*2+1];
char result_str[256];
char filename[256];
/* paramters are optional, first is expected checksum value, second is filename */
/* if only a filename is specfied, we display checksum rather than do match */
filename[0] = digest_str[0] = expected_digest_str[0] = '\0';
text = getparams(text);
if (*text)
{
/* if we have at least one space and the first string is of digest length, assume we matching */
char *tempstr = safe_strcasestr(text, strlen(text), " ", 1);
if ((tempstr != NULL) && (strlen(text) - strlen(tempstr) == DIGEST_LEN*2))
{
safe_strncpy2(expected_digest_str, text, DIGEST_LEN*2+1, DIGEST_LEN*2 );
/* trim leading space from filename */
while (*tempstr == ' ')
tempstr++;
if (*tempstr)
safe_strncpy(filename, tempstr, 256);
}
/* else we only have a filename */
else
safe_strncpy(filename, text, 256 );
}
/* if no parameters default to current map elm file */
else
safe_strncpy(filename, continent_maps[cur_map].name, 256 );
/* calculate, display checksum if we're not matching */
if (*filename && el_file_exists(filename) && get_file_digest(filename, digest))
{
int i;
for(i=0; i<DIGEST_LEN; i++)
sprintf(&digest_str[2*i], "%02x", (int)digest[i]);
digest_str[DIGEST_LEN*2] = 0;
if (! *expected_digest_str)
{
safe_snprintf(result_str, sizeof(result_str), "#ckdata %s %s", digest_str, filename );
LOG_TO_CONSOLE(c_grey1,result_str);
}
}
/* show help if something fails */
else
{
LOG_TO_CONSOLE(c_red2, "ckdata: invalid file or command syntax.");
LOG_TO_CONSOLE(c_red1, "Show current map (elm): #ckdata");
LOG_TO_CONSOLE(c_red1, "Show specified file: #ckdata file_name");
LOG_TO_CONSOLE(c_red1, "Check specified file: #ckdata expected_checksum file_name");
return 1;
}
/* if we have an expected value, compare then display an appropriate message */
if (*expected_digest_str)
{
if (my_strcompare(digest_str, expected_digest_str))
LOG_TO_CONSOLE(c_green2,"ckdata: File matches expected checksum");
else
LOG_TO_CONSOLE(c_red2,"ckdata: File does not match expected checksum");
}
return 1;
} /* end command_ckdata() */
