Java InputStream Read Long readLong(InputStream in)

Description

read Long

License

Apache License

Declaration

static public long readLong(InputStream in) throws IOException 

Method Source Code

//package com.java2s;
//License from project: Apache License 

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

public class Main {
    static public long readLong(InputStream in) throws IOException {
        byte[] buffer = new byte[8];
        readFully(in, buffer, 0, 8);//from w  ww. j  a v  a  2 s  .  co m
        return (((long) buffer[0] << 56) + ((long) (buffer[1] & 255) << 48) + ((long) (buffer[2] & 255) << 40)
                + ((long) (buffer[3] & 255) << 32) + ((long) (buffer[4] & 255) << 24) + ((buffer[5] & 255) << 16)
                + ((buffer[6] & 255) << 8) + ((buffer[7] & 255) << 0));
    }

    static public void readFully(InputStream in, byte buff[]) throws IOException {
        readFully(in, buff, 0, buff.length);
    }

    static public void readFully(InputStream in, byte buff[], int offset, int length) throws IOException {
        if (length < 0)
            throw new IndexOutOfBoundsException();
        int n = 0;
        while (n < length) {
            int count = in.read(buff, offset + n, length - n);
            if (count < 0)
                throw new EOFException();
            n += count;
        }
    }

    static public byte[] read(InputStream in, int len) throws IOException {
        byte[] buff = new byte[len];
        readFully(in, buff);
        return buff;
    }
}

Related

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