Java ByteBuffer Get getTruncatedInt(ByteBuffer bytes, int numBytes)

Description

get Truncated Int

License

Open Source License

Declaration

public static int getTruncatedInt(ByteBuffer bytes, int numBytes) throws IOException 

Method Source Code

//package com.java2s;
/*//from w w w. j  a  v  a2s.c  o  m
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 int getTruncatedInt(ByteBuffer bytes, 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("too few bytes specified for truncated int value!");
            return bytes.getInt();
        }

        if (bytes.remaining() < numBytes)
            throw new IOException("too few bytes specified for truncated int value!");

        int value = 0;
        for (int i = (numBytes - 1); i >= 0; i--)
            value |= ((bytes.get() & 0xff) << (8 * i));
        return value;
    }

    public static int getTruncatedInt(ByteBuffer bytes, int pos, 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("too few bytes specified for truncated int value!");
            return bytes.getInt(pos);
        }

        if ((pos + numBytes) > bytes.limit())
            throw new IOException("too few bytes specified for truncated int value!");

        int value = 0;
        for (int i = (numBytes - 1); i >= 0; i--)
            value |= ((bytes.get(pos++) & 0xff) << (8 * i));
        return value;
    }
}

Related

1. getSurrogateKey(byte[] data, ByteBuffer buffer)
2. getTableUuid(ByteBuffer rowKey)
3. getTempByteBuffer()
4. getTerminatedArray(ByteBuffer buf)
5. getTriByte(ByteBuffer buf)
6. getTsStartSyncByte(ByteBuffer packet, boolean synced)
7. getTsSyncByte(ByteBuffer packet)
8. getUByte(ByteBuffer b)
9. getUleb128(ByteBuffer buffer)