Java InputStream Read All readAll(final InputStream is)

Description

Read all data from input stream

License

Open Source License

Parameter

Parameter	Description
is	InputStream where to read

Exception

Parameter	Description
IOException	if reading fails with IOException

Return

Read data as a byte array

Declaration

public static byte[] readAll(final InputStream is) throws IOException 

Method Source Code

//package com.java2s;
/**//  w  w  w. j  a  va2  s .c  o  m
 *
 * Open Realm of Stars Game Project
 * Copyright (C) 2016  Tuomo Untinen
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see http://www.gnu.org/licenses/
 *
 *
 * Generic IO Utilities
 *
 */

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

public class Main {
    /**
     * Read all data from input stream
     * @param is InputStream where to read
     * @return Read data as a byte array
     * @throws IOException if reading fails with IOException
     */
    public static byte[] readAll(final InputStream is) throws IOException {
        int dataLength = 0;
        int byteOffset = 0;
        int blockSize = 8000;
        byte[] buffer = null;
        do {
            byte[] tmpBuf = new byte[blockSize];
            dataLength = is.read(tmpBuf, 0, tmpBuf.length);
            if (dataLength != -1) {
                byte[] targetBuf;
                if (buffer == null) {
                    targetBuf = new byte[dataLength];
                    byteOffset = 0;
                } else {
                    targetBuf = new byte[buffer.length + dataLength];
                    System.arraycopy(buffer, 0, targetBuf, 0, buffer.length);
                    byteOffset = buffer.length;
                }
                System.arraycopy(tmpBuf, 0, targetBuf, byteOffset, dataLength);
                buffer = targetBuf;
            }
        } while (dataLength != -1);
        return buffer;
    }
}

Related

1. readAll(InputStream i, byte b[])
2. readAll(InputStream in)
3. readall(InputStream in)
4. readAll(InputStream in)