Java ByteBuffer Extract extractBytes(ByteBuffer byteBuffer, byte startByte, byte endByte)

Description

Return the bytes contained between the startByte and the endByte.

License

Open Source License

Parameter

Parameter	Description
byteBuffer	The bytes.
startByte	the first byte to look for
endByte	the second byte to look for

Return

The byte[] contained between startByte and endByte

Declaration

public static byte[] extractBytes(ByteBuffer byteBuffer, byte startByte, byte endByte) 

Method Source Code

//package com.java2s;
/*/*from  w  w  w  .jav  a2  s . c o  m*/
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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
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import java.nio.ByteBuffer;

public class Main {
    /**
     * Return the bytes contained between the startByte and the endByte. The ByteBuffer
     * will be left in the state it was before invoking that method, meaning
     * its position and limit will be the same.
     *
     * @param byteBuffer The bytes.
     * @param startByte the first byte to look for
     * @param endByte the second byte to look for
     * @return The byte[] contained between startByte and endByte
     */
    public static byte[] extractBytes(ByteBuffer byteBuffer, byte startByte, byte endByte) {

        int curPosition = byteBuffer.position();
        int curLimit = byteBuffer.limit();

        if (byteBuffer.position() == 0) {
            throw new IllegalStateException("Invalid state");
        }

        byteBuffer.position(0);
        byteBuffer.limit(curPosition);
        int state = 0;
        int start = 0;
        int end;
        try {
            byte c;

            // Rule b - try to determine the context-root
            while (byteBuffer.hasRemaining()) {
                c = byteBuffer.get();
                switch (state) {
                case 0: // Search for first ' '
                    if (c == startByte) {
                        state = 1;
                        start = byteBuffer.position();
                    }
                    break;
                case 1:
                    if (c == endByte) {
                        end = byteBuffer.position();
                        byte[] bytes = new byte[end - start];
                        byteBuffer.position(start);
                        byteBuffer.limit(end);
                        byteBuffer.get(bytes);
                        return bytes;
                    }
                    break;
                default:
                    throw new IllegalArgumentException("Unexpected state");
                }
            }
            throw new IllegalStateException("Unexpected state");
        } finally {
            byteBuffer.limit(curLimit);
            byteBuffer.position(curPosition);
        }
    }
}

Related

1. extract(ByteBuffer buf)
2. extractBytes(ByteBuffer buf)
3. extractBytes(ByteBuffer buffer, int size)
4. extractSingleHighCardDims(byte[] highCardArr, int index, int highCardinalityCount, ByteBuffer outBuffer)