swap byte order for float values : Java

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10/23/2009 at 12:30PM PDT, ID: 24839170

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8.1

swap byte order for float values

Asked by mitchguy in Java Programming Language, Java AWT & Swing, NetBeans IDE

View the Solution FREE for 30 Days

         
           
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             import java.nio.ByteBuffer;
import java.nio.ByteOrder;
 
public class SwapBytes {
 
    public static float swap(float value) {
        int intValue = Float.floatToRawIntBits(value);
        intValue = swap(intValue);
        return Float.intBitsToFloat(intValue);
    }
 
    public static int swap(int value) {
 
        int b1 = (value >> 0) & 0xff;
        int b2 = (value >> 8) & 0xff;
        int b3 = (value >> 16) & 0xff;
        int b4 = (value >> 24) & 0xff;
 
        return b1 << 24 | b2 << 16 | b3 << 8 | b4 << 0;
    }
 
    public static float swap(float value, int endianNess) {
 
        int bytesForFloat = 4;
        ByteBuffer buffer = ByteBuffer.allocate(bytesForFloat);
        
        if (endianNess == 0) {
            buffer.order(ByteOrder.LITTLE_ENDIAN);
        } else {
            buffer.order(ByteOrder.BIG_ENDIAN);
        }
        System.out.println("BYTE ORDER NOW: " + buffer.order().toString());
 
        buffer.putFloat(0, value);
        buffer.rewind();
        return buffer.getFloat();
    }
 
    
 
    public static void main(String[] args) {
        
	float badValue = -71.80566f;
        float goodValue = -71.80658f;
	float resultVal = 0.0f;
 
        SwapBytes sb = new SwapBytes();
       
        
	System.out.println("\nBAD VALUE:" + badValue);
        resultVal = sb.swap(badValue);
        System.out.println("badValue SWAPPED ONCE:" + resultVal);
 
        //swap back
        resultVal = sb.swap(resultVal);
        System.out.println("badValue SWAPPED TWICE:" + resultVal);
 
  
	System.out.println("\n\nGOOD VALUE:" + goodValue);
        resultVal = sb.swap(goodValue);
        System.out.println("goodValue SWAPPED ONCE:" + resultVal);
      
	//swap back
        resultVal = sb.swap(resultVal);
        System.out.println("goodValue SWAPPED TWICE:" + resultVal);
 
	System.out.println("\n\nByte BUffer function");
	System.out.println("\nBAD VALUE:" + badValue);
        resultVal = sb.swap(badValue,0);
        System.out.println("badValue SWAPPED ONCE:" + resultVal);
 
        //swap back
        resultVal = sb.swap(resultVal,0);
        System.out.println("badValue SWAPPED TWICE:" + resultVal);
 
  	System.out.println("\nByte BUffer function");
	System.out.println("\n\nGOOD VALUE:" + goodValue);
        resultVal = sb.swap(goodValue,1);
        System.out.println("goodValue SWAPPED ONCE:" + resultVal);
      
	//swap back
        resultVal = sb.swap(resultVal,1);
        System.out.println("goodValue SWAPPED TWICE:" + resultVal);
 
    }
}

           
         

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swap byte order for float values

Asked by mitchguy in Java Programming Language, Java AWT & Swing, NetBeans IDE

Tags: Java

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