Java File Read via ByteBuffer readDelimitedFromInputStream(InputStream inputStream)

Description

Read length delimited data from the input stream

License

Open Source License

Parameter

Parameter	Description
inputStream	the input stream to read from

Exception

Parameter	Description
IOException	if a problem occurs

Return

the bytes read

Declaration

protected static byte[] readDelimitedFromInputStream(InputStream inputStream) throws IOException 

Method Source Code

//package com.java2s;
/*/*from  w  w  w .ja  v  a2  s.c om*/
 *   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 3 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/>.
 */

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

import java.nio.ByteBuffer;

public class Main {
    /**
     * Read length delimited data from the input stream
     *
     * @param inputStream the input stream to read from
     * @return the bytes read
     * @throws IOException if a problem occurs
     */
    protected static byte[] readDelimitedFromInputStream(InputStream inputStream) throws IOException {
        byte[] sizeBytes = new byte[4];
        int numRead = inputStream.read(sizeBytes, 0, 4);
        if (numRead < 4) {
            throw new IOException("Failed to read the message size from the input stream!");
        }

        int messageLength = ByteBuffer.wrap(sizeBytes).getInt();
        byte[] messageData = new byte[messageLength];
        // for (numRead = 0; numRead < messageLength; numRead +=
        // inputStream.read(messageData, numRead, messageLength - numRead));
        for (numRead = 0; numRead < messageLength;) {
            int currentNumRead = inputStream.read(messageData, numRead, messageLength - numRead);
            if (currentNumRead < 0) {
                throw new IOException("Unexpected end of stream!");
            }
            numRead += currentNumRead;
        }

        return messageData;
    }
}

Related

1. readCode(byte[] message)
2. readColumnarKeyBlockDataForNoDictionaryCols(byte[] columnarKeyBlockData)
3. readContent(File file)
4. readContentsNIO(FileInputStream input, String encoding, boolean decodeNIO)
5. readData(String fileName, int size)
6. readDouble(BufferedReader br, double[] buf)
7. readDouble(byte[] src, int pointer)
8. readDouble(FileChannel fileChannel, ByteOrder byteOrder)
9. readDouble(final byte[] bytes, final int length, final int offset)