fix handling of second byte

core/src/main/groovy/com/muwire/core/util/DataUtil.groovy

@@ -33,7 +33,7 @@ class DataUtil {
 			throw new IllegalArgumentException("header length $header.length")
 			
 		return (((int)(header[0] & 0x7F)) << 16) |
-				((int)(header[1] & 0xFF << 8)) |
+				(((int)(header[1] & 0xFF) << 8)) |
 				((int)header[2] & 0xFF)
 	}
 }

core/src/test/groovy/com/muwire/core/util/DataUtilTest.groovy

@@ -37,6 +37,7 @@ class DataUtilTest {
 	void testHeader() {
 		header(0)
 		header(1)
+		header(556)
 		header(8 * 1024 * 1024 - 1)
 		try {
 			header(8 * 1024 *  1024)