Java InputStream Read Long readLong(InputStream in)

Description

read Long

License

Apache License

Declaration

public static final long readLong(InputStream in) throws IOException 

Method Source Code

//package com.java2s;
/*//from   w  w w .  j  ava2  s.com
 * Copyright 1999-2012 Alibaba Group.
 *  
 * 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.EOFException;
import java.io.IOException;
import java.io.InputStream;

public class Main {
    public static final long readLong(InputStream in) throws IOException {
        byte[] b = new byte[8];
        read(in, b, 0, b.length);
        long l = b[0] & 0xff;
        l |= (long) (b[1] & 0xff) << 8;
        l |= (long) (b[2] & 0xff) << 16;
        l |= (long) (b[3] & 0xff) << 24;
        l |= (long) (b[4] & 0xff) << 32;
        l |= (long) (b[5] & 0xff) << 40;
        l |= (long) (b[6] & 0xff) << 48;
        l |= (long) (b[7] & 0xff) << 56;
        return l;
    }

    public static final void read(InputStream in, byte[] b, int offset, int length) throws IOException {
        for (int got = 0; length > 0;) {
            got = in.read(b, offset, length);
            if (got < 0) {
                throw new EOFException();
            }
            offset += got;
            length -= got;
        }
    }

    public static final byte read(InputStream in) throws IOException {
        int got = in.read();
        if (got < 0) {
            throw new EOFException();
        }
        return (byte) (got & 0xff);
    }
}

Related

1. readLong(InputStream i)
2. readLong(InputStream in)
3. readLong(InputStream in)
4. readLong(InputStream in)
5. readLong(InputStream in)
6. readLong(InputStream in)
7. readLong(InputStream in)