Java ByteBuffer Get getAscii(ByteBuffer bytes)

Description

get Ascii

License

Open Source License

Declaration

public static String getAscii(ByteBuffer bytes) throws IOException 

Method Source Code

//package com.java2s;
/*// w  w  w  . jav  a  2s .co  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 String getAscii(ByteBuffer bytes) throws IOException {
        StringBuilder builder = new StringBuilder();

        if (bytes.remaining() < 2)
            throw new IOException("too few bytes specified for string value!");
        int numBytes = getUnsignedShort(bytes);
        if (bytes.remaining() < numBytes)
            throw new IOException("too few bytes specified for string value!");
        for (int i = 0; i < numBytes; i++)
            builder.append((char) bytes.get());

        return builder.toString();
    }

    public static String getAscii(ByteBuffer bytes, int pos) throws IOException {
        StringBuilder builder = new StringBuilder();

        if ((pos + 2) > bytes.limit())
            throw new IOException("too few bytes specified for string value!");
        int numBytes = getUnsignedShort(bytes, pos);
        pos += 2;
        if ((pos + numBytes) > bytes.limit())
            throw new IOException("too few bytes specified for string value!");
        for (int i = 0; i < numBytes; i++)
            builder.append((char) bytes.get(pos + i));

        return builder.toString();
    }

    public static int getUnsignedShort(ByteBuffer bytes) throws IOException {
        if (bytes.remaining() < 2)
            throw new IOException("too few bytes specified for unsigned short value!");

        byte b1 = bytes.get();
        byte b2 = bytes.get();

        int value = (int) ((0xff & b1) << 8 | (0xff & b2));
        return value;
    }

    public static int getUnsignedShort(ByteBuffer bytes, int pos) throws IOException {
        if ((pos + 2) > bytes.limit())
            throw new IOException("too few bytes specified for unsigned short value!");

        byte b1 = bytes.get(pos);
        byte b2 = bytes.get(pos + 1);

        int value = (int) ((0xff & b1) << 8 | (0xff & b2));
        return value;
    }
}

Related

1. getAddress(ByteBuffer buffer)
2. getAddressFromDirectByteBuffer(ByteBuffer buffer)
3. getArray(ByteBuffer buffer)
4. getAsByteBuffer()
5. getAsBytes(List buffers)
6. getAsciiString(ByteBuffer buffer)
7. getAsIntArray(ByteBuffer yuv, int size)
8. getAttrs(Map fields)
9. getBatch(ByteBuffer bb)