java: adds Unpacker.unpackBigInteger()

2 files changed, 31 insertions, 4 deletions

diff --git a/java/src/main/java/org/msgpack/BufferedUnpackerImpl.java b/java/src/main/java/org/msgpack/BufferedUnpackerImpl.java
index 9496238..5b449c7 100644
--- a/java/src/main/java/org/msgpack/BufferedUnpackerImpl.java
+++ b/java/src/main/java/org/msgpack/BufferedUnpackerImpl.java
@@ -19,7 +19,7 @@ package org.msgpack;
 
 import java.io.IOException;
 import java.nio.ByteBuffer;
-//import java.math.BigInteger;
+import java.math.BigInteger;
 
 abstract class BufferedUnpackerImpl extends UnpackerImpl {
 	int offset = 0;
@@ -198,8 +198,7 @@ abstract class BufferedUnpackerImpl extends UnpackerImpl {
 			{
 				long o = castBuffer.getLong(0);
 				if(o < 0) {
-					// FIXME unpackBigInteger
-					throw new MessageTypeException("uint 64 bigger than 0x7fffffff is not supported");
+					throw new MessageTypeException();
 				}
 				advance(9);
 				return o;
@@ -231,7 +230,25 @@ abstract class BufferedUnpackerImpl extends UnpackerImpl {
 		}
 	}
 
-	// FIXME unpackBigInteger
+	final BigInteger unpackBigInteger() throws IOException, MessageTypeException {
+		more(1);
+		int b = buffer[offset];
+		if((b & 0xff) != 0xcf) {
+			return BigInteger.valueOf(unpackLong());
+		}
+
+		// unsigned int 64
+		more(9);
+		castBuffer.rewind();
+		castBuffer.put(buffer, offset+1, 8);
+		advance(9);
+		long o = castBuffer.getLong(0);
+		if(o < 0) {
+			return new BigInteger(1, castBuffer.array());
+		} else {
+			return BigInteger.valueOf(o);
+		}
+	}
 
 	final float unpackFloat() throws IOException, MessageTypeException {
 		more(1);
diff --git a/java/src/main/java/org/msgpack/Unpacker.java b/java/src/main/java/org/msgpack/Unpacker.java
index 3a95243..3cae502 100644
--- a/java/src/main/java/org/msgpack/Unpacker.java
+++ b/java/src/main/java/org/msgpack/Unpacker.java
@@ -22,6 +22,7 @@ import java.io.InputStream;
 import java.io.IOException;
 import java.util.Iterator;
 import java.nio.ByteBuffer;
+import java.math.BigInteger;
 
 /**
  * Unpacker enables you to deserialize objects from stream.
@@ -453,6 +454,15 @@ public class Unpacker implements Iterable<MessagePackObject> {
 	}
 
 	/**
+	 * Gets one {@code BigInteger} value from the buffer.
+	 * This method calls {@link fill()} method if needed.
+	 * @throws MessageTypeException the first value of the buffer is not a {@code BigInteger}.
+	 */
+	public BigInteger unpackBigInteger() throws IOException, MessageTypeException {
+		return impl.unpackBigInteger();
+	}
+
+	/**
 	 * Gets one {@code float} value from the buffer.
 	 * This method calls {@link fill()} method if needed.
 	 * @throws MessageTypeException the first value of the buffer is not a {@code float}.