/// <summary>
/// Determines image type via headers.
/// Keeps stream position.
/// </summary>
/// <param name="imgData">Image data, incl header.</param>
/// <returns>Type of image.</returns>
public static SupportedExtensions DetermineImageType(Stream imgData)
{
SupportedExtensions ext = SupportedExtensions.UNKNOWN;
// KFreon: Save position and go back to start
long originalPos = imgData.Position;
imgData.Seek(0, SeekOrigin.Begin);
var bits = new byte[8];
imgData.Read(bits, 0, 8);
// BMP
if (BMP_Header.CheckIdentifier(bits))
{
ext = SupportedExtensions.BMP;
}
// PNG
if (PNG_Header.CheckIdentifier(bits))
{
ext = SupportedExtensions.PNG;
}
// JPG
if (JPG_Header.CheckIdentifier(bits))
{
ext = SupportedExtensions.JPG;
}
// DDS
if (DDS_Header.CheckIdentifier(bits))
{
ext = SupportedExtensions.DDS;
}
// GIF
if (GIF_Header.CheckIdentifier(bits))
{
ext = SupportedExtensions.GIF;
}
if (TIFF_Header.CheckIdentifier(bits))
{
ext = SupportedExtensions.TIF;
}
// TGA (assumed if no other matches
if (ext == SupportedExtensions.UNKNOWN)
{
ext = SupportedExtensions.TGA;
}
// KFreon: Reset stream position
imgData.Seek(originalPos, SeekOrigin.Begin);
return(ext);
}
internal static AbstractHeader LoadHeader(Stream stream)
{
stream.Seek(0, SeekOrigin.Begin);
// Determine type of image
ImageFormats.SupportedExtensions ext = ImageFormats.DetermineImageType(stream);
// Parse header
AbstractHeader header = null;
switch (ext)
{
case ImageFormats.SupportedExtensions.BMP:
header = new BMP_Header(stream);
break;
case ImageFormats.SupportedExtensions.DDS:
header = new DDS_Header(stream);
break;
case ImageFormats.SupportedExtensions.JPG:
header = new JPG_Header(stream);
break;
case ImageFormats.SupportedExtensions.PNG:
header = new PNG_Header(stream);
break;
case ImageFormats.SupportedExtensions.TGA:
header = new TGA_Header(stream);
break;
case ImageFormats.SupportedExtensions.GIF:
header = new GIF_Header(stream);
break;
case ImageFormats.SupportedExtensions.TIF:
header = new TIFF_Header(stream);
break;
default:
throw new NotSupportedException("Image type unknown.");
}
return(header);
}
