/* * 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.apache.cassandra.io.util; import java.io.*; import org.apache.cassandra.utils.vint.VIntCoding; /** * Extension to DataInput that provides support for reading varints */ public interface DataInputPlus extends DataInput { default long readVInt() throws IOException { return VIntCoding.readVInt(this); } /** * Think hard before opting for an unsigned encoding. Is this going to bite someone because some day * they might need to pass in a sentinel value using negative numbers? Is the risk worth it * to save a few bytes? * * Signed, not a fan of unsigned values in protocols and formats */ default long readUnsignedVInt() throws IOException { return VIntCoding.readUnsignedVInt(this); } /** * Always skips the requested number of bytes, unless EOF is reached * * @param n number of bytes to skip * @return number of bytes skipped */ public int skipBytes(int n) throws IOException; public default void skipBytesFully(int n) throws IOException { int skipped = skipBytes(n); if (skipped != n) throw new EOFException("EOF after " + skipped + " bytes out of " + n); } /** * Wrapper around an InputStream that provides no buffering but can decode varints */ public class DataInputStreamPlus extends DataInputStream implements DataInputPlus { public DataInputStreamPlus(InputStream is) { super(is); } } }