package org.apache.lucene.util.encoding;
import java.io.IOException;
/*
* 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.
*/
/**
* An {@link IntDecoder} which can decode values encoded by
* {@link VInt8IntEncoder}.
*
* @lucene.experimental
*/
public class VInt8IntDecoder extends IntDecoder {
private boolean legalEOS = true;
@Override
public long decode() throws IOException {
int value = 0;
while (true) {
int first = in.read();
if (first < 0) {
if (!legalEOS) {
throw new IOException("Unexpected End-Of-Stream");
}
return EOS;
}
value |= first & 0x7F;
if ((first & 0x80) == 0) {
legalEOS = true;
return value;
}
legalEOS = false;
value <<= 7;
}
}
@Override
public String toString() {
return "VInt8";
}
}