private static Color handleBpccSelectionHeader(int bpcc, Color sourcePixelColor)
{
var binaryBpcc =
BinaryDecimalConverter.CalculateBinaryForBpcc(bpcc);
sourcePixelColor.G = (byte)binaryBpcc;
return(sourcePixelColor);
}
/// <summary>
/// Extracts the message from image.
/// </summary>
/// <param name="embeddedPixels">The embedded pixels.</param>
/// <param name="embeddedImageWidth">Width of the embedded image.</param>
/// <param name="embeddedImageHeight">Height of the embedded image.</param>
/// @Precondition none
/// @Postcondition message is extracted from the image
public override async Task ExtractMessageFromImage(byte[] embeddedPixels, uint embeddedImageWidth,
uint embeddedImageHeight)
{
var encryptionPassword = new StringBuilder();
var count = 0;
for (var currY = 0; currY < embeddedImageHeight; currY++)
{
for (var currX = 0; currX < embeddedImageWidth; currX++)
{
var embeddedPixelColor = PixelColorInfo.GetPixelBgra8(embeddedPixels, currY, currX,
embeddedImageWidth);
if (isFirstPixel(currY, currX))
{
if (embeddedPixelColor.R == 212 && embeddedPixelColor.B == 212 &&
embeddedPixelColor.G == 212)
{
continue;
}
await Dialogs.ShowNoMessageDialog();
return;
}
if (isSecondPixel(currY, currX))
{
EncryptionUsed = (embeddedPixelColor.R & 1) != 0;
this.endOfEncryptionKeyReached = !EncryptionUsed;
this.bpcc = BinaryDecimalConverter.CalculateBpccFromBinary(embeddedPixelColor.G);
var numberOfBits = (embeddedImageWidth * embeddedImageHeight - 2) *
PixelConstants.NumberOfColorChannels * this.bpcc;
this.embeddedBits = new BitArray((int)numberOfBits);
}
else
{
if (this.endOfMessageReached)
{
this.handleReachedEndOfMessage(encryptionPassword);
return;
}
this.extractMessageBitsFromPixel(embeddedPixelColor, count);
count += PixelConstants.NumberOfColorChannels * this.bpcc;
}
}
}
}
public void Construction()
{
// arrange
// act
var converter = new BinaryDecimalConverter();
// assert
Assert.NotNull(converter);
Assert.Null(converter.Binary);
Assert.Null(converter.Decimal);
Assert.Null(converter.ErrorMessage);
Assert.Equal("none", converter.ErrorDisplay);
}
public void ConvertBinary_WithDecimalString(
string initialDecimal, string expectedBinary, string expectedErrorMessage, string expectedErrorDisplay)
{
// arrange
var converter = new BinaryDecimalConverter
{
Decimal = initialDecimal
};
// act
converter.ConvertBinary();
// assert
Assert.Equal(expectedBinary, converter.Binary);
Assert.Equal(expectedErrorMessage, converter.ErrorMessage);
Assert.Equal(expectedErrorDisplay, converter.ErrorDisplay);
}
public void ConvertDecimal_WithBinaryString(
string initialBinary, string expectedDecimal, string expectedErrorMessage, string expectedErrorDisplay)
{
// arrange
var converter = new BinaryDecimalConverter
{
Binary = initialBinary
};
// act
converter.ConvertDecimal();
// assert
Assert.Equal(expectedDecimal, converter.Decimal);
Assert.Equal(expectedErrorMessage, converter.ErrorMessage);
Assert.Equal(expectedErrorDisplay, converter.ErrorDisplay);
}
