org.fusesource.hawtbuf.codec.VarLongCodec Maven / Gradle / Ivy
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.fusesource.hawtbuf.codec;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.net.ProtocolException;
/**
* Implementation of a variable length Codec for a Long
*
*/
public class VarLongCodec implements Codec {
public static final VarLongCodec INSTANCE = new VarLongCodec();
public void encode(Long object, DataOutput dataOut) throws IOException {
long value = object;
while (true) {
if ((value & ~0x7FL) == 0) {
dataOut.writeByte((int) value);
return;
} else {
dataOut.writeByte(((int) value & 0x7F) | 0x80);
value >>>= 7;
}
}
}
public Long decode(DataInput dataIn) throws IOException {
int shift = 0;
long result = 0;
while (shift < 64) {
byte b = dataIn.readByte();
result |= (long) (b & 0x7F) << shift;
if ((b & 0x80) == 0)
return result;
shift += 7;
}
throw new ProtocolException("Encountered a malformed variable int");
}
public boolean isEstimatedSizeSupported() {
return true;
}
public int estimatedSize(Long object) {
long value = object;
if ((value & (0xffffffffffffffffL << 7)) == 0)
return 1;
if ((value & (0xffffffffffffffffL << 14)) == 0)
return 2;
if ((value & (0xffffffffffffffffL << 21)) == 0)
return 3;
if ((value & (0xffffffffffffffffL << 28)) == 0)
return 4;
if ((value & (0xffffffffffffffffL << 35)) == 0)
return 5;
if ((value & (0xffffffffffffffffL << 42)) == 0)
return 6;
if ((value & (0xffffffffffffffffL << 49)) == 0)
return 7;
if ((value & (0xffffffffffffffffL << 56)) == 0)
return 8;
if ((value & (0xffffffffffffffffL << 63)) == 0)
return 9;
return 10;
}
public int getFixedSize() {
return -1;
}
public Long deepCopy(Long source) {
return source;
}
public boolean isDeepCopySupported() {
return true;
}
}