/// <summary>
/// Creates <see cref="JpegImage"/> from stream with an arbitrary image data
/// </summary>
/// <param name="imageData">Stream containing bytes of image in
/// arbitrary format (BMP, Jpeg, GIF, PNG, TIFF, e.t.c)</param>
public JpegImage(Stream imageData)
{
if (imageData is null)
{
throw new ArgumentNullException(nameof(imageData));
}
m_compressedData = new MemoryStream();
imageData.CopyTo(m_compressedData);
if (CompressedData.Length <= 2)
{
throw new ArgumentException("There must be at least two bytes in the image stream", nameof(imageData));
}
CompressedData.Seek(0, SeekOrigin.Begin);
var first = CompressedData.ReadByte();
var second = CompressedData.ReadByte();
if (!(first == 0xFF) &&
(second == (int)JpegMarker.SOI))
{
throw new ArgumentException("This is not a JPEG stream", nameof(imageData));
}
Decompress();
}
