java: redesign

cpp/msgpack/type/nil.hpp

@@ -51,6 +51,14 @@ inline void operator<< (object::with_zone& o, type::nil v)
 	{ static_cast<object&>(o) << v; }
 
 
+template <>
+inline void object::as<void>() const
+{
+	msgpack::type::nil v;
+	convert(&v);
+}
+
+
 }  // namespace msgpack
 
 #endif /* msgpack/type/nil.hpp */

java/src/main/java/org/msgpack/BufferedUnpackerImpl.java

@@ -0,0 +1,384 @@
+//
+// MessagePack for Java
+//
+// Copyright (C) 2009-2010 FURUHASHI Sadayuki
+//
+//    Licensed under the Apache License, Version 2.0 (the "License");
+//    you may not use this file except in compliance with the License.
+//    You may obtain a copy of the License at
+//
+//        http://www.apache.org/licenses/LICENSE-2.0
+//
+//    Unless required by applicable law or agreed to in writing, software
+//    distributed under the License is distributed on an "AS IS" BASIS,
+//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//    See the License for the specific language governing permissions and
+//    limitations under the License.
+//
+package org.msgpack;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+//import java.math.BigInteger;
+
+abstract class BufferedUnpackerImpl extends UnpackerImpl {
+	int filled = 0;
+	byte[] buffer = null;
+	private ByteBuffer castBuffer = ByteBuffer.allocate(8);
+
+	abstract boolean fill() throws IOException;
+
+	final int next(int offset, UnpackResult result) throws IOException, UnpackException {
+		if(filled == 0) {
+			if(!fill()) {
+				return offset;
+			}
+		}
+
+		do {
+			int noffset = super.execute(buffer, offset, filled);
+			if(noffset <= offset) {
+				if(!fill()) {
+					return offset;
+				}
+			}
+			offset = noffset;
+		} while(!super.isFinished());
+
+		Object obj = super.getData();
+		super.reset();
+		result.done(obj);
+
+		return offset;
+	}
+
+	private final void more(int offset, int require) throws IOException, UnpackException {
+		while(filled - offset < require) {
+			if(!fill()) {
+				// FIXME
+				throw new UnpackException("insufficient buffer");
+			}
+		}
+	}
+
+	final byte unpackByte(UnpackCursor c, int offset) throws IOException, MessageTypeException {
+		int o = unpackInt(c, offset);
+		if(0x7f < o || o < -0x80) {
+			throw new MessageTypeException();
+		}
+		return (byte)o;
+	}
+
+	final short unpackShort(UnpackCursor c, int offset) throws IOException, MessageTypeException {
+		int o = unpackInt(c, offset);
+		if(0x7fff < o || o < -0x8000) {
+			throw new MessageTypeException();
+		}
+		return (short)o;
+	}
+
+	final int unpackInt(UnpackCursor c, int offset) throws IOException, MessageTypeException {
+		more(offset, 1);
+		int b = buffer[offset];
+		if((b & 0x80) == 0 || (b & 0xe0) == 0xe0) {  // Fixnum
+			return (int)b;
+		}
+		switch(b & 0xff) {
+		case 0xcc:  // unsigned int  8
+			more(offset, 2);
+			c.advance(2);
+			return (int)((short)buffer[offset+1] & 0xff);
+		case 0xcd:  // unsigned int 16
+			more(offset, 3);
+			castBuffer.rewind();
+			castBuffer.put(buffer, offset+1, 2);
+			c.advance(3);
+			return (int)((int)castBuffer.getShort(0) & 0xffff);
+		case 0xce:  // unsigned int 32
+			more(offset, 5);
+			castBuffer.rewind();
+			castBuffer.put(buffer, offset+1, 4);
+			{
+				int o = castBuffer.getInt(0);
+				if(o < 0) {
+					throw new MessageTypeException();
+				}
+				c.advance(5);
+				return o;
+			}
+		case 0xcf:  // unsigned int 64
+			more(offset, 9);
+			castBuffer.rewind();
+			castBuffer.put(buffer, offset+1, 8);
+			{
+				long o = castBuffer.getLong(0);
+				if(o < 0 || o > 0x7fffffffL) {
+					throw new MessageTypeException();
+				}
+				c.advance(9);
+				return (int)o;
+			}
+		case 0xd0:  // signed int  8
+			more(offset, 2);
+			c.advance(2);
+			return (int)buffer[offset+1];
+		case 0xd1:  // signed int 16
+			more(offset, 3);
+			castBuffer.rewind();
+			castBuffer.put(buffer, offset+1, 2);
+			c.advance(3);
+			return (int)castBuffer.getShort(0);
+		case 0xd2:  // signed int 32
+			more(offset, 4);
+			castBuffer.rewind();
+			castBuffer.put(buffer, offset+1, 4);
+			c.advance(4);
+			return (int)castBuffer.getInt(0);
+		case 0xd3:  // signed int 64
+			more(offset, 9);
+			castBuffer.rewind();
+			castBuffer.put(buffer, offset+1, 8);
+			{
+				long o = castBuffer.getLong(0);
+				if(0x7fffffffL < o || o < -0x80000000L) {
+					throw new MessageTypeException();
+				}
+				c.advance(9);
+				return (int)o;
+			}
+		default:
+			throw new MessageTypeException();
+		}
+	}
+
+	final long unpackLong(UnpackCursor c, int offset) throws IOException, MessageTypeException {
+		more(offset, 1);
+		int b = buffer[offset];
+		if((b & 0x80) == 0 || (b & 0xe0) == 0xe0) {  // Fixnum
+			return (long)b;
+		}
+		switch(b & 0xff) {
+		case 0xcc:  // unsigned int  8
+			more(offset, 2);
+			c.advance(2);
+			return (long)((short)buffer[offset+1] & 0xff);
+		case 0xcd:  // unsigned int 16
+			more(offset, 3);
+			castBuffer.rewind();
+			castBuffer.put(buffer, offset+1, 2);
+			c.advance(3);
+			return (long)((int)castBuffer.getShort(0) & 0xffff);
+		case 0xce:  // unsigned int 32
+			more(offset, 5);
+			castBuffer.rewind();
+			castBuffer.put(buffer, offset+1, 4);
+			c.advance(5);
+			return ((long)castBuffer.getInt(0) & 0xffffffffL);
+		case 0xcf:  // unsigned int 64
+			more(offset, 9);
+			castBuffer.rewind();
+			castBuffer.put(buffer, offset+1, 8);
+			{
+				long o = castBuffer.getLong(0);
+				if(o < 0) {
+					// FIXME
+					throw new MessageTypeException("uint 64 bigger than 0x7fffffff is not supported");
+				}
+				c.advance(9);
+				return o;
+			}
+		case 0xd0:  // signed int  8
+			more(offset, 2);
+			c.advance(2);
+			return (long)buffer[offset+1];
+		case 0xd1:  // signed int 16
+			more(offset, 3);
+			castBuffer.rewind();
+			castBuffer.put(buffer, offset+1, 2);
+			c.advance(3);
+			return (long)castBuffer.getShort(0);
+		case 0xd2:  // signed int 32
+			more(offset, 4);
+			castBuffer.rewind();
+			castBuffer.put(buffer, offset+1, 4);
+			c.advance(4);
+			return (long)castBuffer.getInt(0);
+		case 0xd3:  // signed int 64
+			more(offset, 9);
+			castBuffer.rewind();
+			castBuffer.put(buffer, offset+1, 8);
+			c.advance(9);
+			return (long)castBuffer.getLong(0);
+		default:
+			throw new MessageTypeException();
+		}
+	}
+
+	final float unpackFloat(UnpackCursor c, int offset) throws IOException, MessageTypeException {
+		more(offset, 1);
+		int b = buffer[offset];
+		switch(b & 0xff) {
+		case 0xca:  // float
+			more(offset, 5);
+			castBuffer.rewind();
+			castBuffer.put(buffer, offset+1, 4);
+			c.advance(5);
+			return castBuffer.getFloat(0);
+		case 0xcb:  // double
+			more(offset, 9);
+			castBuffer.rewind();
+			castBuffer.put(buffer, offset+1, 8);
+			c.advance(9);
+			// FIXME overflow check
+			return (float)castBuffer.getDouble(0);
+		default:
+			throw new MessageTypeException();
+		}
+	}
+
+	final double unpackDouble(UnpackCursor c, int offset) throws IOException, MessageTypeException {
+		more(offset, 1);
+		int b = buffer[offset];
+		switch(b & 0xff) {
+		case 0xca:  // float
+			more(offset, 5);
+			castBuffer.rewind();
+			castBuffer.put(buffer, offset+1, 4);
+			c.advance(5);
+			return (double)castBuffer.getFloat(0);
+		case 0xcb:  // double
+			more(offset, 9);
+			castBuffer.rewind();
+			castBuffer.put(buffer, offset+1, 8);
+			c.advance(9);
+			return castBuffer.getDouble(0);
+		default:
+			throw new MessageTypeException();
+		}
+	}
+
+	final Object unpackNull(UnpackCursor c, int offset) throws IOException, MessageTypeException {
+		more(offset, 1);
+		int b = buffer[offset] & 0xff;
+		if(b != 0xc0) {  // nil
+			throw new MessageTypeException();
+		}
+		c.advance(1);
+		return null;
+	}
+
+	final boolean unpackBoolean(UnpackCursor c, int offset) throws IOException, MessageTypeException {
+		more(offset, 1);
+		int b = buffer[offset] & 0xff;
+		if(b == 0xc2) {  // false
+			c.advance(1);
+			return false;
+		} else if(b == 0xc3) {  // true
+			c.advance(1);
+			return true;
+		} else {
+			throw new MessageTypeException();
+		}
+	}
+
+	final int unpackArray(UnpackCursor c, int offset) throws IOException, MessageTypeException {
+		more(offset, 1);
+		int b = buffer[offset];
+		if((b & 0xf0) == 0x90) {  // FixArray
+			c.advance(1);
+			return (int)(b & 0x0f);
+		}
+		switch(b & 0xff) {
+		case 0xdc:  // array 16
+			more(offset, 3);
+			castBuffer.rewind();
+			castBuffer.put(buffer, offset+1, 2);
+			c.advance(3);
+			return (int)castBuffer.getShort(0) & 0xffff;
+		case 0xdd:  // array 32
+			more(offset, 5);
+			castBuffer.rewind();
+			castBuffer.put(buffer, offset+1, 4);
+			c.advance(5);
+			// FIXME overflow check
+			return castBuffer.getInt(0) & 0x7fffffff;
+		default:
+			throw new MessageTypeException();
+		}
+	}
+
+	final int unpackMap(UnpackCursor c, int offset) throws IOException, MessageTypeException {
+		more(offset, 1);
+		int b = buffer[offset];
+		if((b & 0xf0) == 0x80) {  // FixMap
+			c.advance(1);
+			return (int)(b & 0x0f);
+		}
+		switch(b & 0xff) {
+		case 0xde:  // map 16
+			more(offset, 3);
+			castBuffer.rewind();
+			castBuffer.put(buffer, offset+1, 2);
+			c.advance(3);
+			return (int)castBuffer.getShort(0) & 0xffff;
+		case 0xdf:  // map 32
+			more(offset, 5);
+			castBuffer.rewind();
+			castBuffer.put(buffer, offset+1, 4);
+			c.advance(5);
+			// FIXME overflow check
+			return castBuffer.getInt(0) & 0x7fffffff;
+		default:
+			throw new MessageTypeException();
+		}
+	}
+
+	final int unpackRaw(UnpackCursor c, int offset) throws IOException, MessageTypeException {
+		more(offset, 1);
+		int b = buffer[offset];
+		if((b & 0xe0) == 0xa0) {  // FixRaw
+			c.advance(1);
+			return (int)(b & 0x0f);
+		}
+		switch(b & 0xff) {
+		case 0xda:  // raw 16
+			more(offset, 3);
+			castBuffer.rewind();
+			castBuffer.put(buffer, offset+1, 2);
+			c.advance(3);
+			return (int)castBuffer.getShort(0) & 0xffff;
+		case 0xdb:  // raw 32
+			more(offset, 5);
+			castBuffer.rewind();
+			castBuffer.put(buffer, offset+1, 4);
+			c.advance(5);
+			// FIXME overflow check
+			return castBuffer.getInt(0) & 0x7fffffff;
+		default:
+			throw new MessageTypeException();
+		}
+	}
+
+	final byte[] unpackRawBody(UnpackCursor c, int offset, int length) throws IOException, MessageTypeException {
+		more(offset, length);
+		byte[] bytes = new byte[length];
+		System.arraycopy(buffer, offset, bytes, 0, length);
+		c.advance(length);
+		return bytes;
+	}
+
+	final String unpackString(UnpackCursor c, int offset) throws IOException, MessageTypeException {
+		int length = unpackRaw(c, offset);
+		offset = c.getOffset();
+		more(offset, length);
+		String s;
+		try {
+			s = new String(buffer, offset, length, "UTF-8");
+		} catch (Exception e) {
+			throw new MessageTypeException();
+		}
+		c.advance(length);
+		return s;
+	}
+}
+

java/src/main/java/org/msgpack/MessageConvertable.java

@@ -17,7 +17,7 @@
 //
 package org.msgpack;
 
-public interface MessageMergeable {
-	public void messageMerge(Object obj) throws MessageTypeException;
+public interface MessageConvertable {
+	public void messageConvert(Object obj) throws MessageTypeException;
 }
 

java/src/main/java/org/msgpack/MessageTypeException.java

@@ -17,9 +17,7 @@
 //
 package org.msgpack;
 
-import java.io.IOException;
-
-public class MessageTypeException extends IOException {
+public class MessageTypeException extends RuntimeException {
 	public MessageTypeException() { }
 
 	public MessageTypeException(String s) {

java/src/main/java/org/msgpack/MessageUnpackable.java

@@ -0,0 +1,25 @@
+//
+// MessagePack for Java
+//
+// Copyright (C) 2009-2010 FURUHASHI Sadayuki
+//
+//    Licensed under the Apache License, Version 2.0 (the "License");
+//    you may not use this file except in compliance with the License.
+//    You may obtain a copy of the License at
+//
+//        http://www.apache.org/licenses/LICENSE-2.0
+//
+//    Unless required by applicable law or agreed to in writing, software
+//    distributed under the License is distributed on an "AS IS" BASIS,
+//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//    See the License for the specific language governing permissions and
+//    limitations under the License.
+//
+package org.msgpack;
+
+import java.io.IOException;
+
+public interface MessageUnpackable {
+	public void messageUnpack(Unpacker pk) throws IOException, MessageTypeException;
+}
+

java/src/main/java/org/msgpack/Packer.java

@@ -401,7 +401,7 @@ public class Packer {
 		} else if(o instanceof Double) {
 			return packDouble((Double)o);
 		} else {
-			throw new IOException("unknown object "+o+" ("+o.getClass()+")");
+			throw new MessageTypeException("unknown object "+o+" ("+o.getClass()+")");
 		}
 	}
 }

java/src/main/java/org/msgpack/UnbufferedUnpacker.java

@@ -1,82 +0,0 @@
-//
-// MessagePack for Java
-//
-// Copyright (C) 2009-2010 FURUHASHI Sadayuki
-//
-//    Licensed under the Apache License, Version 2.0 (the "License");
-//    you may not use this file except in compliance with the License.
-//    You may obtain a copy of the License at
-//
-//        http://www.apache.org/licenses/LICENSE-2.0
-//
-//    Unless required by applicable law or agreed to in writing, software
-//    distributed under the License is distributed on an "AS IS" BASIS,
-//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-//    See the License for the specific language governing permissions and
-//    limitations under the License.
-//
-package org.msgpack;
-
-import java.lang.Iterable;
-import java.io.InputStream;
-import java.io.IOException;
-import java.util.Iterator;
-import org.msgpack.impl.UnpackerImpl;
-
-public class UnbufferedUnpacker extends UnpackerImpl {
-	private int offset;
-	private boolean finished;
-	private Object data;
-
-	public UnbufferedUnpacker() {
-		super();
-		this.offset = 0;
-		this.finished = false;
-	}
-
-	public UnbufferedUnpacker useSchema(Schema s) {
-		super.setSchema(s);
-		return this;
-	}
-
-	public Object getData() {
-		return data;
-	}
-
-	public boolean isFinished() {
-		return finished;
-	}
-
-	public void reset() {
-		super.reset();
-		this.offset = 0;
-	}
-
-	int getOffset() {
-		return offset;
-	}
-
-	void setOffset(int offset) {
-		this.offset = offset;
-	}
-
-	public int execute(byte[] buffer) throws UnpackException {
-		return execute(buffer, 0, buffer.length);
-	}
-
-	// FIXME
-	public int execute(byte[] buffer, int offset, int length) throws UnpackException
-	{
-		int noffset = super.execute(buffer, offset + this.offset, length);
-		this.offset = noffset - offset;
-		if(super.isFinished()) {
-			this.data = super.getData();
-			this.finished = true;
-			super.reset();
-		} else {
-			this.finished = false;
-		}
-		return noffset;
-	}
-}
-

java/src/main/java/org/msgpack/UnpackCursor.java

@@ -0,0 +1,96 @@
+//
+// MessagePack for Java
+//
+// Copyright (C) 2009-2010 FURUHASHI Sadayuki
+//
+//    Licensed under the Apache License, Version 2.0 (the "License");
+//    you may not use this file except in compliance with the License.
+//    You may obtain a copy of the License at
+//
+//        http://www.apache.org/licenses/LICENSE-2.0
+//
+//    Unless required by applicable law or agreed to in writing, software
+//    distributed under the License is distributed on an "AS IS" BASIS,
+//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//    See the License for the specific language governing permissions and
+//    limitations under the License.
+//
+package org.msgpack;
+
+import java.io.IOException;
+
+public class UnpackCursor {
+	private Unpacker pac;
+	private int offset;
+
+	UnpackCursor(Unpacker pac, int offset)
+	{
+		this.pac = pac;
+		this.offset = offset;
+	}
+
+	final void advance(int length) {
+		offset += length;
+	}
+
+	final int getOffset() {
+		return offset;
+	}
+
+	public byte unpackByte() throws IOException, MessageTypeException {
+		return pac.impl.unpackByte(this, offset);
+	}
+
+	public short unpackShort() throws IOException, MessageTypeException {
+		return pac.impl.unpackShort(this, offset);
+	}
+
+	public int unpackInt() throws IOException, MessageTypeException {
+		return pac.impl.unpackInt(this, offset);
+	}
+
+	public long unpackLong() throws IOException, MessageTypeException {
+		return pac.impl.unpackLong(this, offset);
+	}
+
+	public float unpackFloat() throws IOException, MessageTypeException {
+		return pac.impl.unpackFloat(this, offset);
+	}
+
+	public double unpackDouble() throws IOException, MessageTypeException {
+		return pac.impl.unpackDouble(this, offset);
+	}
+
+	public Object unpackNull() throws IOException, MessageTypeException {
+		return pac.impl.unpackNull(this, offset);
+	}
+
+	public boolean unpackBoolean() throws IOException, MessageTypeException {
+		return pac.impl.unpackBoolean(this, offset);
+	}
+
+	public int unpackArray() throws IOException, MessageTypeException {
+		return pac.impl.unpackArray(this, offset);
+	}
+
+	public int unpackMap() throws IOException, MessageTypeException {
+		return pac.impl.unpackMap(this, offset);
+	}
+
+	public int unpackRaw() throws IOException, MessageTypeException {
+		return pac.impl.unpackRaw(this, offset);
+	}
+
+	public byte[] unpackRawBody(int length) throws IOException, MessageTypeException {
+		return pac.impl.unpackRawBody(this, offset, length);
+	}
+
+	public String unpackString() throws IOException, MessageTypeException {
+		return pac.impl.unpackString(this, offset);
+	}
+
+	public void commit() {
+		pac.setOffset(offset);
+	}
+}
+

java/src/main/java/org/msgpack/UnpackIterator.java

@@ -21,41 +21,27 @@ import java.io.IOException;
 import java.util.Iterator;
 import java.util.NoSuchElementException;
 
-public class UnpackIterator implements Iterator<Object> {
+public class UnpackIterator extends UnpackResult implements Iterator<Object> {
 	private Unpacker pac;
-	private boolean have;
-	private Object data;
 
 	UnpackIterator(Unpacker pac) {
+		super();
 		this.pac = pac;
-		this.have = false;
 	}
 
 	public boolean hasNext() {
-		if(have) { return true; }
 		try {
-			while(true) {
-				if(pac.execute()) {
-					data = pac.getData();
-					pac.reset();
-					have = true;
-					return true;
-				}
-
-				if(!pac.fill()) {
-					return false;
-				}
-			}
+			return pac.next(this);
 		} catch (IOException e) {
 			return false;
 		}
 	}
 
 	public Object next() {
-		if(!have && !hasNext()) {
+		if(!finished && !hasNext()) {
 			throw new NoSuchElementException();
 		}
-		have = false;
+		finished = false;
 		return data;
 	}
 

java/src/main/java/org/msgpack/UnpackResult.java

@@ -0,0 +1,42 @@
+//
+// MessagePack for Java
+//
+// Copyright (C) 2009-2010 FURUHASHI Sadayuki
+//
+//    Licensed under the Apache License, Version 2.0 (the "License");
+//    you may not use this file except in compliance with the License.
+//    You may obtain a copy of the License at
+//
+//        http://www.apache.org/licenses/LICENSE-2.0
+//
+//    Unless required by applicable law or agreed to in writing, software
+//    distributed under the License is distributed on an "AS IS" BASIS,
+//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//    See the License for the specific language governing permissions and
+//    limitations under the License.
+//
+package org.msgpack;
+
+public class UnpackResult {
+	protected boolean finished = false;
+	protected Object data = null;
+
+	public boolean isFinished() {
+		return finished;
+	}
+
+	public Object getData() {
+		return data;
+	}
+
+	public void reset() {
+		finished = false;
+		data = null;
+	}
+
+	void done(Object obj) {
+		finished = true;
+		data = obj;
+	}
+}
+

java/src/main/java/org/msgpack/Unpacker.java

@@ -22,18 +22,43 @@ import java.io.InputStream;
 import java.io.IOException;
 import java.util.Iterator;
 import java.nio.ByteBuffer;
-import org.msgpack.impl.UnpackerImpl;
 
-public class Unpacker extends UnpackerImpl implements Iterable<Object> {
+public class Unpacker implements Iterable<Object> {
 
-	public static final int DEFAULT_BUFFER_SIZE = 32*1024;
+	// buffer:
+	// +---------------------------------------------+
+	// | [object] | [obje| unparsed ... | unused  ...|
+	// +---------------------------------------------+
+	//            ^ parsed
+	//                   ^ offset
+	//                                  ^ filled
+	//                                               ^ buffer.length
+
+	private static final int DEFAULT_BUFFER_SIZE = 32*1024;
+
+	protected int offset;
+	protected int parsed;
+	protected int bufferReserveSize;
+	protected InputStream stream;
+
+	class BufferedUnpackerMixin extends BufferedUnpackerImpl {
+		boolean fill() throws IOException {
+			if(stream == null) {
+				return false;
+			}
+			reserveBuffer(bufferReserveSize);
+			int rl = stream.read(buffer, filled, buffer.length - filled);
+			// equals: stream.read(getBuffer(), getBufferOffset(), getBufferCapacity());
+			if(rl <= 0) {
+				return false;
+			}
+			bufferConsumed(rl);
+			return true;
+		}
+	};
+
+	final BufferedUnpackerMixin impl = new BufferedUnpackerMixin();
 
-	private int used;
-	private int offset;
-	private int parsed;
-	private byte[] buffer;
-	private int bufferReserveSize;
-	private InputStream stream;
 
 	public Unpacker() {
 		this(DEFAULT_BUFFER_SIZE);
@@ -48,67 +73,31 @@ public class Unpacker extends UnpackerImpl implements Iterable<Object> {
 	}
 
 	public Unpacker(InputStream stream, int bufferReserveSize) {
-		super();
-		this.used = 0;
 		this.offset = 0;
 		this.parsed = 0;
-		this.buffer = new byte[bufferReserveSize];
 		this.bufferReserveSize = bufferReserveSize/2;
 		this.stream = stream;
 	}
 
 	public Unpacker useSchema(Schema s) {
-		super.setSchema(s);
+		impl.setSchema(s);
 		return this;
 	}
 
-	public void reserveBuffer(int size) {
-		if(buffer.length - used >= size) {
-			return;
-		}
-		/*
-		if(used == parsed && buffer.length >= size) {
-			// rewind buffer
-			used = 0;
-			offset = 0;
-			return;
-		}
-		*/
 
-		int nextSize = buffer.length * 2;
-		while(nextSize < size + used) {
-			nextSize *= 2;
-		}
-
-		byte[] tmp = new byte[nextSize];
-		System.arraycopy(buffer, offset, tmp, 0, used - offset);
-
-		buffer = tmp;
-		used -= offset;
-		offset = 0;
+	public InputStream getStream() {
+		return this.stream;
 	}
 
-	public byte[] getBuffer() {
-		return buffer;
-	}
-
-	public int getBufferOffset() {
-		return used;
-	}
-
-	public int getBufferCapacity() {
-		return buffer.length - used;
-	}
-
-	public void bufferConsumed(int size) {
-		used += size;
+	public void setStream(InputStream stream) {
+		this.stream = stream;
 	}
 
 	public void feed(ByteBuffer buffer) {
 		int length = buffer.remaining();
 		if (length == 0) return;
 		reserveBuffer(length);
-		buffer.get(this.buffer, this.offset, length);
+		buffer.get(impl.buffer, this.offset, length);
 		bufferConsumed(length);
 	}
 
@@ -118,48 +107,116 @@ public class Unpacker extends UnpackerImpl implements Iterable<Object> {
 
 	public void feed(byte[] buffer, int offset, int length) {
 		reserveBuffer(length);
-		System.arraycopy(buffer, offset, this.buffer, this.offset, length);
+		System.arraycopy(buffer, offset, impl.buffer, this.offset, length);
 		bufferConsumed(length);
 	}
 
 	public boolean fill() throws IOException {
-		if(stream == null) {
-			return false;
-		}
-		reserveBuffer(bufferReserveSize);
-		int rl = stream.read(getBuffer(), getBufferOffset(), getBufferCapacity());
-		if(rl <= 0) {
-			return false;
-		}
-		bufferConsumed(rl);
-		return true;
+		return impl.fill();
 	}
 
 	public Iterator<Object> iterator() {
 		return new UnpackIterator(this);
 	}
 
+	public UnpackResult next() throws IOException, UnpackException {
+		UnpackResult result = new UnpackResult();
+		this.offset = impl.next(this.offset, result);
+		return result;
+	}
+
+	public boolean next(UnpackResult result) throws IOException, UnpackException {
+		this.offset = impl.next(this.offset, result);
+		return result.isFinished();
+	}
+
+
+	public void reserveBuffer(int require) {
+		if(impl.buffer == null) {
+			int nextSize = (bufferReserveSize < require) ? require : bufferReserveSize;
+			impl.buffer = new byte[nextSize];
+			return;
+		}
+
+		if(impl.buffer.length - impl.filled >= require) {
+			return;
+		}
+
+		int nextSize = impl.buffer.length * 2;
+		int notParsed = impl.filled - this.offset;
+		while(nextSize < require + notParsed) {
+			nextSize *= 2;
+		}
+
+		byte[] tmp = new byte[nextSize];
+		System.arraycopy(impl.buffer, this.offset, tmp, 0, impl.filled - this.offset);
+
+		impl.buffer = tmp;
+		impl.filled = notParsed;
+		this.offset = 0;
+	}
+
+	public byte[] getBuffer() {
+		return impl.buffer;
+	}
+
+	public int getBufferOffset() {
+		return impl.filled;
+	}
+
+	public int getBufferCapacity() {
+		return impl.buffer.length - impl.filled;
+	}
+
+	public void bufferConsumed(int size) {
+		impl.filled += size;
+	}
+
 	public boolean execute() throws UnpackException {
-		int noffset = super.execute(buffer, offset, used);
+		int noffset = impl.execute(impl.buffer, offset, impl.filled);
 		if(noffset <= offset) {
 			return false;
 		}
 		parsed += noffset - offset;
 		offset = noffset;
-		return super.isFinished();
+		return impl.isFinished();
+	}
+
+
+	public int execute(byte[] buffer) throws UnpackException {
+		return execute(buffer, 0, buffer.length);
+	}
+
+	public int execute(byte[] buffer, int offset, int length) throws UnpackException {
+		int noffset = impl.execute(buffer, offset + this.offset, length);
+		this.offset = noffset - offset;
+		if(impl.isFinished()) {
+			impl.resetState();
+		}
+		return noffset;
+	}
+
+	public boolean isFinished() {
+		return impl.isFinished();
 	}
 
 	public Object getData() {
-		return super.getData();
+		return impl.getData();
 	}
 
 	public void reset() {
-		super.reset();
-		parsed = 0;
+		impl.reset();
 	}
 
+
+	public UnpackCursor begin()
+	{
+		return new UnpackCursor(this, offset);
+	}
+
+
 	public int getMessageSize() {
-		return parsed - offset + used;
+		return parsed - offset + impl.filled;
 	}
 
 	public int getParsedSize() {
@@ -167,7 +224,7 @@ public class Unpacker extends UnpackerImpl implements Iterable<Object> {
 	}
 
 	public int getNonParsedSize() {
-		return used - offset;
+		return impl.filled - offset;
 	}
 
 	public void skipNonparsedBuffer(int size) {
@@ -175,80 +232,14 @@ public class Unpacker extends UnpackerImpl implements Iterable<Object> {
 	}
 
 	public void removeNonparsedBuffer() {
-		used = offset;
+		impl.filled = offset;
 	}
 
-	/*
-	public static class Context {
-		private boolean finished;
-		private Object data;
-		private int offset;
-		private UnpackerImpl impl;
 
-		public Context()
-		{
-			this.finished = false;
-			this.impl = new UnpackerImpl();
-		}
-
-		public boolean isFinished()
-		{
-			return finished;
-		}
-
-		public Object getData()
-		{
-			return data;
-		}
-
-		int getOffset()
-		{
-			return offset;
-		}
-
-		void setFinished(boolean finished)
-		{
-			this.finished = finished;
-		}
-
-		void setData(Object data)
-		{
-			this.data = data;
-		}
-
-		void setOffset(int offset)
-		{
-			this.offset = offset;
-		}
-
-		UnpackerImpl getImpl()
-		{
-			return impl;
-		}
-	}
-
-	public static int unpack(Context ctx, byte[] buffer) throws UnpackException
+	void setOffset(int offset)
 	{
-		return unpack(ctx, buffer, 0, buffer.length);
+		parsed += offset - this.offset;
+		this.offset = offset;
 	}
-
-	public static int unpack(Context ctx, byte[] buffer, int offset, int length) throws UnpackException
-	{
-		UnpackerImpl impl = ctx.getImpl();
-		int noffset = impl.execute(buffer, offset + ctx.getOffset(), length);
-		ctx.setOffset(noffset - offset);
-		if(impl.isFinished()) {
-			ctx.setData(impl.getData());
-			ctx.setFinished(false);
-			impl.reset();
-		} else {
-			ctx.setData(null);
-			ctx.setFinished(true);
-		}
-		int parsed = noffset - offset;
-		ctx.setOffset(parsed);
-		return noffset;
-	}
-	*/
 }
 

java/src/main/java/org/msgpack/UnpackerImpl.java

@@ -15,7 +15,7 @@
 //    See the License for the specific language governing permissions and
 //    limitations under the License.
 //
-package org.msgpack.impl;
+package org.msgpack;
 
 import java.nio.ByteBuffer;
 //import java.math.BigInteger;
@@ -47,7 +47,7 @@ public class UnpackerImpl {
 	static final int CT_MAP_KEY     = 0x01;
 	static final int CT_MAP_VALUE   = 0x02;
 
-	static final int MAX_STACK_SIZE = 16;
+	static final int MAX_STACK_SIZE = 32;
 
 	private int cs;
 	private int trail;
@@ -67,41 +67,45 @@ public class UnpackerImpl {
 	private static final Schema GENERIC_SCHEMA = new GenericSchema();
 	private Schema rootSchema;
 
-	protected UnpackerImpl()
+	public UnpackerImpl()
 	{
 		setSchema(GENERIC_SCHEMA);
 	}
 
-	protected void setSchema(Schema schema)
+	public void setSchema(Schema schema)
 	{
 		this.rootSchema = schema;
 		reset();
 	}
 
-	protected Object getData()
+	public final Object getData()
 	{
 		return data;
 	}
 
-	protected boolean isFinished()
+	public final boolean isFinished()
 	{
 		return finished;
 	}
 
-	protected void reset()
-	{
+	public final void resetState() {
 		cs = CS_HEADER;
 		top = -1;
-		finished = false;
-		data = null;
 		top_ct = 0;
 		top_count = 0;
 		top_obj = null;
 		top_schema = rootSchema;
 	}
 
+	public final void reset()
+	{
+		resetState();
+		finished = false;
+		data = null;
+	}
+
 	@SuppressWarnings("unchecked")
-	protected int execute(byte[] src, int off, int length) throws UnpackException
+	public final int execute(byte[] src, int off, int length) throws UnpackException
 	{
 		if(off >= length) { return off; }
 

java/src/test/java/org/msgpack/TestDirectConversion.java

@@ -0,0 +1,154 @@
+package org.msgpack;
+
+import org.msgpack.*;
+import java.io.*;
+import java.util.*;
+
+import org.junit.Test;
+import static org.junit.Assert.*;
+
+public class TestDirectConversion {
+    private UnpackCursor prepareCursor(ByteArrayOutputStream out) {
+        ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
+        Unpacker upk = new Unpacker(in);
+        return upk.begin();
+    }
+
+    @Test
+    public void testInt() throws Exception {
+        testInt(0);
+        testInt(-1);
+        testInt(1);
+        testInt(Integer.MIN_VALUE);
+        testInt(Integer.MAX_VALUE);
+        Random rand = new Random();
+        for (int i = 0; i < 1000; i++)
+            testInt(rand.nextInt());
+    }
+    public void testInt(int val) throws Exception {
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        new Packer(out).pack(val);
+        UnpackCursor c = prepareCursor(out);
+        assertEquals(val, c.unpackInt());
+        c.commit();
+    }
+
+    @Test
+    public void testFloat() throws Exception {
+        testFloat((float)0.0);
+        testFloat((float)-0.0);
+        testFloat((float)1.0);
+        testFloat((float)-1.0);
+        testFloat((float)Float.MAX_VALUE);
+        testFloat((float)Float.MIN_VALUE);
+        testFloat((float)Float.NaN);
+        testFloat((float)Float.NEGATIVE_INFINITY);
+        testFloat((float)Float.POSITIVE_INFINITY);
+        Random rand = new Random();
+        for (int i = 0; i < 1000; i++)
+            testFloat(rand.nextFloat());
+    }
+    public void testFloat(float val) throws Exception {
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        new Packer(out).pack(val);
+        UnpackCursor c = prepareCursor(out);
+        float f = c.unpackFloat();
+        if(Float.isNaN(val)) {
+            assertTrue(Float.isNaN(f));
+        } else {
+            assertEquals(val, f, 10e-10);
+        }
+        c.commit();
+    }
+
+    @Test
+    public void testDouble() throws Exception {
+        testDouble((double)0.0);
+        testDouble((double)-0.0);
+        testDouble((double)1.0);
+        testDouble((double)-1.0);
+        testDouble((double)Double.MAX_VALUE);
+        testDouble((double)Double.MIN_VALUE);
+        testDouble((double)Double.NaN);
+        testDouble((double)Double.NEGATIVE_INFINITY);
+        testDouble((double)Double.POSITIVE_INFINITY);
+        Random rand = new Random();
+        for (int i = 0; i < 1000; i++)
+            testDouble(rand.nextDouble());
+    }
+    public void testDouble(double val) throws Exception {
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        new Packer(out).pack(val);
+        UnpackCursor c = prepareCursor(out);
+        double f = c.unpackDouble();
+        if(Double.isNaN(val)) {
+            assertTrue(Double.isNaN(f));
+        } else {
+            assertEquals(val, f, 10e-10);
+        }
+        c.commit();
+    }
+
+    @Test
+    public void testNil() throws Exception {
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        new Packer(out).packNil();
+        UnpackCursor c = prepareCursor(out);
+        assertEquals(null, c.unpackNull());
+        c.commit();
+    }
+
+    @Test
+    public void testBoolean() throws Exception {
+        testBoolean(false);
+        testBoolean(true);
+    }
+    public void testBoolean(boolean val) throws Exception {
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        new Packer(out).pack(val);
+        UnpackCursor c = prepareCursor(out);
+        assertEquals(val, c.unpackBoolean());
+        c.commit();
+    }
+
+    @Test
+    public void testString() throws Exception {
+        testString("");
+        testString("a");
+        testString("ab");
+        testString("abc");
+        // small size string
+        for (int i = 0; i < 100; i++) {
+            StringBuilder sb = new StringBuilder();
+            int len = (int)Math.random() % 31 + 1;
+            for (int j = 0; j < len; j++)
+                sb.append('a' + ((int)Math.random()) & 26);
+            testString(sb.toString());
+        }
+        // medium size string
+        for (int i = 0; i < 100; i++) {
+            StringBuilder sb = new StringBuilder();
+            int len = (int)Math.random() % 100 + (1 << 15);
+            for (int j = 0; j < len; j++)
+                sb.append('a' + ((int)Math.random()) & 26);
+            testString(sb.toString());
+        }
+        // large size string
+        for (int i = 0; i < 10; i++) {
+            StringBuilder sb = new StringBuilder();
+            int len = (int)Math.random() % 100 + (1 << 31);
+            for (int j = 0; j < len; j++)
+                sb.append('a' + ((int)Math.random()) & 26);
+            testString(sb.toString());
+        }
+    }
+    public void testString(String val) throws Exception {
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        new Packer(out).pack(val);
+        UnpackCursor c = prepareCursor(out);
+        assertEquals(val, c.unpackString());
+        c.commit();
+    }
+
+    // FIXME container types
+};

java/src/test/java/org/msgpack/TestPackUnpack.java

@@ -237,5 +237,5 @@ public class TestPackUnpack {
             System.out.println("Got unexpected class: " + obj.getClass());
             assertTrue(false);
         }
-    }    
+    }
 };