public void testEncode() throws EncodingException {
PngStegoImage encodedImage = new PngStegoImage();
encodedImage.setImageBitmap(mCoverImage);
encodedImage.setEmbeddedData(mData);
encodedImage.encode();
assertNotNull("Image Bytes should not be null.", encodedImage.getImageBytes());
}
public void testDecode() throws EncodingException, DecodingException {
PngStegoImage encodedImage = new PngStegoImage();
encodedImage.setImageBitmap(mCoverImage);
encodedImage.setEmbeddedData(mData);
encodedImage.encode();
byte[] encodedImageBytes = encodedImage.getImageBytes();
PngStegoImage decodedImage = new PngStegoImage();
decodedImage.setImageBytes(encodedImageBytes);
decodedImage.decode();
byte[] decodedBytes = decodedImage.getEmbeddedData();
assertNotNull(decodedBytes);
assertEquals(mData.length, decodedBytes.length);
ByteBuffer b = ByteBuffer.wrap(decodedBytes).order(Constants.BYTE_ORDER);
//
// We should get the same values back as we embedded
//
assertEquals(1, b.getInt());
assertEquals(-12, b.getInt());
assertEquals(123, b.getInt());
assertEquals(-1234, b.getInt());
assertEquals(12345, b.getInt());
assertEquals(-123456, b.getInt());
}
public void testActualStegImage() throws DecodingException {
Options opts = new Options();
opts.inScaled = false;
Bitmap bitmap =
BitmapFactory.decodeResource(getContext().getResources(), R.drawable.steg, opts);
PngStegoImage image = new PngStegoImage();
image.setImageBitmap(bitmap);
image.decode();
assertTrue(image.hasEmbeddedData());
}
public void testPngMaxData() throws EncodingException, DecodingException {
int maxLength = PngStegoImage.getMaxBytesEncodable(mCoverImage);
byte[] bytes = new byte[maxLength];
for (int i = 0; i < bytes.length; i++) {
bytes[i] = (byte) (i % 255);
}
PngStegoImage image = new PngStegoImage();
image.setImageBitmap(mCoverImage);
image.setEmbeddedData(bytes);
image.encode();
PngStegoImage decoder = new PngStegoImage();
decoder.setImageBytes(image.getImageBytes());
decoder.decode();
int bitnum = 8 * Constants.STEGO_HEADER_LENGTH;
for (int i = 0; i < bytes.length; i++) {
assertEquals(
String.format(
"Bytes length %d, Byte %d, Expected '%x' Actual '%x', bitnum is %d",
bytes.length, i, bytes[i] & 0xFF, decoder.getEmbeddedData()[i] & 0xFF, bitnum),
bytes[i],
decoder.getEmbeddedData()[i]);
bitnum += 8;
}
}
