Java ByteBuffer to Int readVarInt(ByteBuffer stream)

Description

read Var Int

License

Open Source License

Declaration

public static int readVarInt(ByteBuffer stream) throws IOException 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

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

public class Main {
    public static int readVarInt(ByteBuffer stream) throws IOException {
        final byte b[] = new byte[1];
        int count = 0;
        int result = 0;

        do {/*from   w  ww.  j a  v a 2  s . c o  m*/
            if (count == 5) {
                // If we get here it means that the fifth bit had its
                // high bit set, which implies corrupt data.
                throw new IOException("stream corrupted");
            }
            stream.get(b);

            result |= (b[0] & 0x7F) << (7 * count);
            ++count;
        } while ((b[0] & 0x80) > 0);

        return result;
    }

    public static int readVarInt(InputStream stream) throws IOException {
        final byte b[] = new byte[1];
        int count = 0;
        int result = 0;

        do {
            if (count == 5) {
                // If we get here it means that the fifth bit had its
                // high bit set, which implies corrupt data.
                throw new IOException("stream corrupted");
            }
            if (stream.read(b) == -1) {
                throw new IOException("end of stream");
            }
            result |= (b[0] & 0x7F) << (7 * count);
            ++count;
        } while ((b[0] & 0x80) > 0);

        return result;
    }
}

Related

1. readUnsignedVarint(ByteBuffer buffer)
2. readVarInt(ByteBuffer buff)
3. readVarInt(ByteBuffer buff)
4. readVarint(ByteBuffer buffer)
5. readVarInt(ByteBuffer buffer)
6. readVarIntRest(ByteBuffer buff, int b)
7. toInt(ByteBuffer buffer)
8. toInt(ByteBuffer buffer)
9. toInt(ByteBuffer bytes)