coders
Class LSBEncoder

java.lang.Object
  coders.LSBEncoder

public class LSBEncoder
extends java.lang.Object

Encodes/decodes messages into 24-bit color bitmaps potentially using the LSB of each color of each pixel. Currently, one bit from each pixel will be used. The first 32 pixels / bits will be used to encode the length of the message in bytes. Probably want to change these routines to be payload-driven instead of pixel-driven.

Author:

Jonathan L Dautrich Jr.

Constructor Summary

LSBEncoder()

Method Summary

private static boolean	bit(byte x, int y) Returns true if and only if bit y in byte x is set.
private static boolean	bit(long x, int y) Returns true if and only if bit y in long x is set.
static java.lang.String	decode(Bitmap bitmap)
static byte[]	decodeBytes(Bitmap bitmap)
static void	encode(Bitmap bitmap, byte[] bytes)
static void	encode(Bitmap bitmap, java.lang.String s)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LSBEncoder

public LSBEncoder()

Method Detail

encode

public static void encode(Bitmap bitmap,
                          java.lang.String s)

encode

public static void encode(Bitmap bitmap,
                          byte[] bytes)

decode

public static java.lang.String decode(Bitmap bitmap)

decodeBytes

public static byte[] decodeBytes(Bitmap bitmap)

bit

private static boolean bit(byte x,
                           int y)

Returns true if and only if bit y in byte x is set.

Parameters:

x -

y -

Returns:

bit

private static boolean bit(long x,
                           int y)

Returns true if and only if bit y in long x is set.

Parameters:

x -

y -

Returns: