Java ByteBuffer Put putTruncatedInt(ByteBuffer bytes, int value, int numBytes)

Description

put Truncated Int

License

Open Source License

Declaration

public static ByteBuffer putTruncatedInt(ByteBuffer bytes, int value, int numBytes) throws IOException 

Method Source Code

//package com.java2s;
/*//from w w  w.  jav  a2  s .c om
Copyright 2011 Semantic Discovery, Inc. (www.semanticdiscovery.com)
    
This file is part of the Semantic Discovery Toolkit.
    
The Semantic Discovery Toolkit is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
    
The Semantic Discovery Toolkit 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 Lesser General Public License for more details.
    
You should have received a copy of the GNU Lesser General Public License
along with The Semantic Discovery Toolkit.  If not, see <http://www.gnu.org/licenses/>.
*/

import java.nio.ByteBuffer;
import java.io.IOException;

public class Main {
    public static ByteBuffer putTruncatedInt(ByteBuffer bytes, int value, int numBytes) throws IOException {
        if (numBytes <= 0)
            throw new IOException("too few bytes specified for truncated int value!");
        else if (numBytes >= 4) {
            if (bytes.remaining() < 4)
                throw new IOException("not enough space in buffer to write truncated int value");
            return bytes.putInt(value);
        }

        if (bytes.remaining() < numBytes)
            throw new IOException("not enough space in buffer to write truncated int value");

        int maxValue = 0xff;
        for (int i = 1; i < numBytes; i++)
            maxValue = (maxValue << 8) | 0xff;

        if (value > maxValue)
            throw new IOException("int value exceeds maximum truncated int value of " + maxValue + "!");

        for (int i = (numBytes - 1); i >= 0; i--)
            bytes.put((byte) (0xff & (value >> (8 * i))));

        return bytes;
    }

    public static ByteBuffer putTruncatedInt(ByteBuffer bytes, int pos, int value, int numBytes)
            throws IOException {
        if (numBytes <= 0)
            throw new IOException("too few bytes specified for truncated int value!");
        else if (numBytes >= 4) {
            if ((pos + 4) > bytes.limit())
                throw new IOException("not enough space in buffer to write truncated int value");
            return bytes.putInt(pos, value);
        }

        if ((pos + numBytes) > bytes.limit())
            throw new IOException("not enough space in buffer to write truncated int value");

        int maxValue = 0xff;
        for (int i = 1; i < numBytes; i++)
            maxValue = (maxValue << 8) | 0xff;

        if (value > maxValue)
            throw new IOException("int value exceeds maximum truncated int value of " + maxValue + "!");

        for (int i = (numBytes - 1); i >= 0; i--)
            bytes.put(pos++, (byte) (0xff & (value >> (8 * i))));

        return bytes;
    }
}

Related

1. putString(String name, ByteBuffer buffer)
2. putString(String str, ByteBuffer bb)
3. putStringAsCharArray(ByteBuffer byteBuffer, String s)
4. putStringToByteBuffer(final ByteBuffer bb, String value, String charset)
5. putTriByte(ByteBuffer buf, int value)
6. putUInt16(ByteBuffer buffer, long value)
7. putUInt32(ByteBuffer buffer, long value)
8. putUnsignedByte(ByteBuffer bb, int value)
9. putUnsignedInt(ByteBuffer buffer, long value)