Java File Read via ByteBuffer readVarLong(byte[] arr)

Description

read Var Long

License

Apache License

Declaration

public static long readVarLong(byte[] arr) 

Method Source Code

//package com.java2s;
/*/*from  w  w  w  . ja  va2 s  . c om*/
 * 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.
 */

import java.nio.ByteBuffer;

public class Main {
    public static long readVarLong(byte[] arr) {
        return readVarLong(ByteBuffer.wrap(arr));
    }

    public static long readVarLong(byte[] arr, int offset, int length) {
        return readVarLong(ByteBuffer.wrap(arr, offset, length));
    }

    public static long readVarLong(ByteBuffer buf) {
        long value = 0L;
        int i = 0;
        long b;
        while (((b = buf.get()) & 0x80L) != 0) {
            value |= (b & 0x7F) << i;
            i += 7;
        }
        return value | (b << i);
    }
}

Related

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2. readUintLE(byte[] bytes, int pointer, int size)
3. readUnsignedInt(InputStream is)
4. readUnsignedInt24(InputStream is)
5. readUtf8(DataInput in)
6. readWaveFile44100_16Bit_Mono(String dir, String name)
7. readWavHeader(DataInputStream inStrm, FileChannel fc)
8. readWholeFile(File file, StringBuilder stringBuilder)
9. readZipComment(File file)