Add support for reading unsigned int "i"

Add support for reading unsigned int "I"

https://www.rabbitmq.com/amqp-0-9-1-errata.html#section_3

Author: gustf

src/main/java/com/rabbitmq/client/impl/ValueReader.java

@@ -164,6 +164,9 @@ static Object readFieldValue(DataInputStream in)
           case 'I':
               value = in.readInt();
               break;
+          case 'i':
+              value = readUnsignedInt(in);
+              break;
           case 'D':
               int scale = in.readUnsignedByte();
               byte [] unscaled = new byte[4];
@@ -213,6 +216,17 @@ static Object readFieldValue(DataInputStream in)
         return value;
     }
 
+    /** Read an unsigned int */
+    private static long readUnsignedInt(DataInputStream in) throws IOException {
+        long ch1 = in.read();
+        long ch2 = in.read();
+        long ch3 = in.read();
+        long ch4 = in.read();
+        if ((ch1 | ch2 | ch3 | ch4) < 0)
+            throw new EOFException();
+        return ((ch1 << 24) + (ch2 << 16) + (ch3 << 8) + ch4);
+    }
+
     /** Read a field-array */
     private static List<Object> readArray(DataInputStream in)
         throws IOException