/// <summary>
/// Initializes a new instance of the <see cref="ExtractManager" /> class.
/// </summary>
public ExtractManager()
{
this.fileReader = new FileReader();
this.fileWriter = new FileWriter();
this.EmbeddedImageFile = null;
this.messageExtracter = null;
this.dpiX = 0;
this.dpiY = 0;
}
/// <summary>
/// Extracts the message.
/// </summary>
/// @Precondition this.embeddedImageFile != null
/// @Postcondition message is extracted from image
public async Task ExtractMessage()
{
var embeddedPixels = await PixelExtracter.ExtractPixelDataFromFile(this.EmbeddedImageFile);
var embeddedDecoder =
await BitmapDecoder.CreateAsync(await this.EmbeddedImageFile.OpenAsync(FileAccessMode.Read));
var fileTypeEmbedded =
EmbeddedMessageFileTypeExtractor.DetermineFileTypeToExtract(embeddedPixels, embeddedDecoder.PixelWidth);
if (fileTypeEmbedded == FileTypes.Text)
{
this.messageExtracter = new TextFileExtracter();
}
else
{
this.messageExtracter = new MonochromeImageExtracter();
}
await this.setExtractedImageSizeValues();
await this.messageExtracter.ExtractMessageFromImage(embeddedPixels, embeddedDecoder.PixelWidth,
embeddedDecoder.PixelHeight);
}
