Java InputStream Read Long readLong(InputStream is)

Description

read Long

License

Apache License

Declaration

public static long readLong(InputStream is) throws IOException 

Method Source Code

//package com.java2s;
/*// w  w w . j ava 2s  .c o m
 * Copyright 2016 Dmitriy Malakhov.
 *
 * 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.
 */

import java.io.IOException;
import java.io.InputStream;

public class Main {
    public static long readLong(InputStream is) throws IOException {
        byte[] b = new byte[8];
        read(is, b);
        return toLong(b);
    }

    public static void read(InputStream is, byte[] bytes) throws IOException {
        int start = 0;
        do {
            int count = is.read(bytes, start, bytes.length - start);
            start += count;
        } while (start < bytes.length);
    }

    public static long toLong(byte[] b) {
        long MASK = 0xFF;
        long result = 0;
        result = b[7] & MASK;
        result = result + ((b[6] & MASK) << 8);
        result = result + ((b[5] & MASK) << 16);
        result = result + ((b[4] & MASK) << 24);
        result = result + ((b[3] & MASK) << 32);
        result = result + ((b[2] & MASK) << 40);
        result = result + ((b[1] & MASK) << 48);
        result = result + ((b[0] & MASK) << 56);
        return result;
    }
}

Related

1. readLong(InputStream in)
2. readLong(InputStream input)
3. readLong(InputStream inputStream)
4. readLong(InputStream inputStream)
5. readLong(InputStream is)
6. readLong(InputStream is)
7. readLong(InputStream is)
8. readLong(InputStream is)
9. readLong(InputStream is)