+ static char str[sizeof("ff:ff:ff:ff:ff:ff ")];
+
+ snprintf(str, sizeof(str), "%02x:%02x:%02x:%02x:%02x:%02x",
+ mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
+
+ return str;
+}
+
+uint32_t
+crc32_file(FILE *fp)
+{
+ static uint32_t *crcvals = NULL;
+ if (!crcvals) {
+ crcvals = malloc(sizeof(*crcvals) * 256);
+
+ for (size_t i = 0; i < 256; ++i) {
+ uint32_t c = i;
+ for (size_t j = 0; j < 8; ++j)
+ c = (c & 1) ? (0xEDB88320 ^ (c >> 1)) : (c >> 1);
+ crcvals[i] = c;
+ }
+ }
+
+ uint8_t buf[1024];
+ size_t len;
+ uint32_t c = 0xFFFFFFFF;
+
+ do {
+ len = fread(buf, 1, sizeof(buf), fp);
+ for (size_t i = 0; i < len; ++i)
+ c = crcvals[(c ^ buf[i]) & 0xFF] ^ (c >> 8);
+ } while (len == sizeof(buf));
+
+ return c ^ 0xFFFFFFFF;