Changes in uspace/srv/fs/udf/udf_cksum.c [5c702a8:48e3190] in mainline

File:

• uspace/srv/fs/udf/udf_cksum.c (modified) (2 diffs)

uspace/srv/fs/udf/udf_cksum.c

@@ -73 +73 @@
 };
 
+/** Calculate CRC16
+ *
+ */
+uint16_t udf_cksum(uint8_t *buf, size_t len)
+{
+        uint16_t crc = 0;
+        
+        while (len-- > 0)
+                crc = crc_table[(crc >> 8 ^ *buf++) & 0xff] ^ (crc << 8);
+        
+        return crc;
+}
+
 /** Unicode checksum
  *
@@ -90 +103 @@
         
         return crc;
+}
+
+/** EA checksum
+ *
+ * Calculate a 16-bit checksum of the Implementation Use
+ * Extended Attribute header or Application Use Extended Attribute
+ * header. The fields AttributeType through ImplementationIdentifier
+ * (or ApplicationIdentifier) inclusively represent the
+ * data covered by the checksum (48 bytes).
+ *
+ */
+uint16_t udf_ea_cksum(uint8_t *data)
+{
+        uint16_t checksum = 0;
+        size_t count;
+        
+        for (count = 0; count < 48; count++)
+                checksum += *data++;
+        
+        return checksum;
 }