public static async Task <TIFF> LoadFromStream(Stream stream)
{
var tiff = new TIFF();
tiff._ifh = await ImageFileHeader.LoadFromStream(stream);
if (tiff._ifh.OffsetOf1stIFD == 0)
{
return(tiff);
}
stream.Position = tiff._ifh.OffsetOf1stIFD;
while (true)
{
var ifd = await ImageFileDirectory.LoadFromStream(stream, tiff._ifh.IsLittleEndian);
tiff.ImageFileDirectories.Add(ifd);
if (ifd.OffsetOfNextIFD == 0)
{
break;
}
stream.Position = ifd.OffsetOfNextIFD;
}
return(tiff);
}
public static async Task <ImageFileHeader> LoadFromStream(Stream stream)
{
var ifh = new ImageFileHeader();
var TIFFBOM = new byte[2];
await stream.ReadAsync(TIFFBOM, 0, 2);
var BOMValue = System.Text.Encoding.ASCII.GetString(TIFFBOM);
ifh.IsLittleEndian = BOMValue == "II";
var binaryReader = new BinaryTools.BinaryReader(stream, ifh.IsLittleEndian);
await binaryReader.ReadUInt16Async(); // dispose 42
ifh.OffsetOf1stIFD = await binaryReader.ReadUInt32Async();
return(ifh);
}