Compressed put/get operations on a ByteBuffer for byte, char, short, int, long, Byte, Character, Short, Integer, and Long.

Compress.java

import java.nio.ByteBuffer;


public class Compress
{
    
    public static final int BYTE_MORE = 0x80;
    public static final int BYTE_SIGN = 0x40;
    public static final int BYTE_NULL = 0x20;

    public static int sizeOf(int value) 
    {
        value = Math.abs( value );
        return (value < (1 <<  6) ? 1 :
               (value < (1 << 13) ? 2 : 
               (value < (1 << 20) ? 3 :
               (value < (1 << 27) ? 4 : 5))));
    }
    
    public static int sizeOf(long value) 
    {
        value = Math.abs( value );
        return (value < (1L <<  6) ? 1 :    
               (value < (1L << 13) ? 2 :    
               (value < (1L << 20) ? 3 :    
               (value < (1L << 27) ? 4 :    
               (value < (1L << 34) ? 5 :    
               (value < (1L << 41) ? 6 :    
               (value < (1L << 48) ? 7 :    
               (value < (1L << 55) ? 8 :    
               (value < (1L << 62) ? 9 : 10)))))))));
    }
    
    public static int sizeOfNullable(Number n) 
    {
        if (n == null) return 1; 
        int value = Math.abs( n.intValue() );
        
        return (value < (1 <<  5) ? 1 :  
               (value < (1 << 12) ? 2 :  
               (value < (1 << 19) ? 3 :  
               (value < (1 << 26) ? 4 : 5))));
    }
    
    public static int sizeOfNullable(Long n) 
    {
        if (n == null) return 1; 
        long value = Math.abs( n.longValue() );
        
        return (value < (1L <<  5) ? 1 :                    
               (value < (1L << 12) ? 2 :                  
               (value < (1L << 19) ? 3 :                
               (value < (1L << 26) ? 4 :              
               (value < (1L << 33) ? 5 :            
               (value < (1L << 40) ? 6 : 
               (value < (1L << 47) ? 7 : 
               (value < (1L << 54) ? 8 : 
               (value < (1L << 61) ? 9 : 10)))))))));
    }
    
    public static int getInt(ByteBuffer in)
    {
        int a = in.get() & 0xFF;
        int sign = (a & BYTE_SIGN);
        int value = (a & 0x3f);
        int shift = -1;
        
        while ((a & BYTE_MORE) != 0)
        {
            a = in.get() & 0xFF;
            value |= (a & 0x7F) << (shift += 7);
        }
        
        if (sign != 0)
        {
            value = -value;
        }
        
        return value;
    }
    
    public static Integer getIntNullable(ByteBuffer in)
    {
        int a = in.get() & 0xFF;

        if ((a & BYTE_NULL) != 0) 
        {
            return null;
        }
        
        int sign = (a & BYTE_SIGN);
        int value = (a & 0x1f);
        int shift = -2;
        
        while ((a & BYTE_MORE) != 0)
        {
            a = in.get() & 0xFF;
            value |= (a & 0x7F) << (shift += 7);
        }
        
        if (sign != 0)
        {
            value = -value;
        }
        
        return value;
    }
    
    public static void putInt(ByteBuffer out, int x)
    {
        int value = (x < 0 ? -x : x);
        int sign = (x < 0 ? BYTE_SIGN : 0);
        int a = (value & 0x3F);
        int more = (value >>= 6) != 0 ? BYTE_MORE : 0;
        
        out.put( (byte)(more | sign | a) );
        
        while (more != 0)
        {
            a = value & 0x7F;
            more = (value >>= 7) != 0 ? BYTE_MORE : 0;
            out.put( (byte)(more | a) );
        }
    }
    
    public static void putIntNullable(ByteBuffer out, Integer x)
    {
        if (x == null) 
        {
            out.put( (byte)BYTE_NULL );
        }
        else
        {
            int value = (x < 0 ? -x : x);
            int sign = (x < 0 ? BYTE_SIGN : 0);
            int a = (value & 0x1F);
            int more = (value >>= 5) != 0 ? BYTE_MORE : 0;
            
            out.put( (byte)(more | sign | a) );
            
            while (more != 0)
            {
                a = value & 0x7F;
                more = (value >>= 7) != 0 ? BYTE_MORE : 0;
                out.put( (byte)(more | a) );
            }
        }
    }
    

    public static long getLong(ByteBuffer in)
    {
        int a = in.get() & 0xFF;
        int sign = (a & BYTE_SIGN);
        long value = (a & 0x3fL);
        int shift = -1;
        
        while ((a & BYTE_MORE) != 0)
        {
            a = in.get() & 0xFF;
            value |= (a & 0x7FL) << (shift += 7);
        }
        
        if (sign != 0)
        {
            value = -value;
        }
        
        return value;
    }
    
    public static Long getLongNullable(ByteBuffer in)
    {
        int a = in.get() & 0xFF;

        if ((a & BYTE_NULL) != 0) 
        {
            return null;
        }
        
        int sign = (a & BYTE_SIGN);
        long value = (a & 0x1FL);
        int shift = -2;
        
        while ((a & BYTE_MORE) != 0)
        {
            a = in.get() & 0xFF;
            value |= (a & 0x7FL) << (shift += 7);
        }
        
        if (sign != 0)
        {
            value = -value;
        }
        
        return value;
    }
    
    public static void putLong(ByteBuffer out, long x)
    {
        long value = (x < 0 ? -x : x);
        int sign = (x < 0 ? BYTE_SIGN : 0);
        long a = (value & 0x3F);
        int more = (value >>= 6) != 0 ? BYTE_MORE : 0;
        
        out.put( (byte)(more | sign | a) );
        
        while (more != 0)
        {
            a = value & 0x7F;
            more = (value >>= 7) != 0 ? BYTE_MORE : 0;
            out.put( (byte)(more | a) );
        }
    }
    
    public static void putLongNullable(ByteBuffer out, Long x)
    {
        if (x == null) 
        {
            out.put( (byte)BYTE_NULL );
        }
        else
        {
            long value = (x < 0 ? -x : x);
            int sign = (x < 0 ? BYTE_SIGN : 0);
            long a = (value & 0x1F);
            int more = (value >>= 5) != 0 ? BYTE_MORE : 0;
            
            out.put( (byte)(more | sign | a) );
            
            while (more != 0)
            {
                a = value & 0x7F;
                more = (value >>= 7) != 0 ? BYTE_MORE : 0;
                out.put( (byte)(more | a) );
            }
        }
    }
    
    public static void putShort(ByteBuffer out, short x) 
    {
        putInt( out, x );
    }
    
    public static short getShort(ByteBuffer in) 
    {
        return (short)getInt( in );
    }
    
    public static void putShortNullable(ByteBuffer out, Short x) 
    {
        putIntNullable( out, x == null ? null : x.intValue() );
    }
    
    public static Short getShortNullable(ByteBuffer in) 
    {
        Integer x = getIntNullable( in );
        
        return (x == null ? null : x.shortValue());
    }
    
    public static void putChar(ByteBuffer out, char c) 
    {
        putInt( out, c );
    }
    
    public static char getChar(ByteBuffer in) 
    {
        return (char)getInt( in );
    }
    
    public static void putCharNullable(ByteBuffer out, Character x) 
    {
        putIntNullable( out, x == null ? null : (int)x );
    }
    
    public static Character getCharNullable(ByteBuffer in) 
    {
        Integer x = getIntNullable( in );
        
        return (x == null ? null : (char)x.intValue() );
    }
    
    public static void putByte(ByteBuffer out, byte b) 
    {
        out.put( b );
    }
    public static byte getByte(ByteBuffer in) 
    {
        return in.get();
    }
    
    public static void putByteNullable(ByteBuffer out, Byte x) 
    {
        putIntNullable( out, x == null ? null : x.intValue() );
    }
    
    public static Byte getByteNullable(ByteBuffer in) 
    {
        Integer x = getIntNullable( in );
        
        return (x == null ? null : x.byteValue() );
    }

}