Changeset 2089

Timestamp:

05/27/10 12:19:36 (21 months ago)

Author:

mwhitworth

Message:

Add IpPartialSum.

Files:

• Whitix/branches/netchannel/user/sdk/network/checksum.h (modified) (1 diff)

Whitix/branches/netchannel/user/sdk/network/checksum.h

@@ -10 +10 @@
         ushort length;
 }__attribute__((packed));
+
+static inline ushort IpPartialSum(void* _data, ulong bytes, ushort _sum)
+{
+        uchar* data = (uchar*)_data;
+        ulong sum = _sum;
+
+        while (bytes > 1)
+        {
+                sum += (((ushort)*(data+1) << 8) | *data);
+                data += 2;
+                bytes -= 2;
+        }
+
+        if (bytes)
+                sum += *data;
+
+        while (sum >> 16)
+                sum = (ushort)sum + (sum >> 16);
+
+        return (ushort)sum;
+}
 
 static inline ushort TcpUdpHeaderSum(ulong sourceAddr, ulong destAddr, ushort len, uchar proto)