public AdobeJpegDirectory Extract(SequentialReader reader)
{
reader.IsMotorolaByteOrder = false;
var directory = new AdobeJpegDirectory();
try
{
if (reader.GetString(Preamble.Length) != Preamble)
{
directory.AddError("Invalid Adobe JPEG data header.");
return directory;
}
directory.Set(AdobeJpegDirectory.TagDctEncodeVersion, reader.GetUInt16());
directory.Set(AdobeJpegDirectory.TagApp14Flags0, reader.GetUInt16());
directory.Set(AdobeJpegDirectory.TagApp14Flags1, reader.GetUInt16());
directory.Set(AdobeJpegDirectory.TagColorTransform, reader.GetSByte());
}
catch (IOException ex)
{
directory.AddError("IO exception processing data: " + ex.Message);
}
return directory;
}
public DuckyDirectory Extract(SequentialReader reader)
{
var directory = new DuckyDirectory();
try
{
while (true)
{
var tag = reader.GetUInt16();
// End of Segment is marked with zero
if (tag == 0)
break;
var length = reader.GetUInt16();
switch (tag)
{
case DuckyDirectory.TagQuality:
{
if (length != 4)
{
directory.AddError("Unexpected length for the quality tag");
return directory;
}
directory.Set(tag, reader.GetUInt32());
break;
}
case DuckyDirectory.TagComment:
case DuckyDirectory.TagCopyright:
{
reader.Skip(4);
directory.Set(tag, reader.GetString(length - 4, Encoding.BigEndianUnicode));
break;
}
default:
{
// Unexpected tag
directory.Set(tag, reader.GetBytes(length));
break;
}
}
}
}
catch (IOException e)
{
directory.AddError(e.Message);
}
return directory;
}
public BitReader(SequentialReader source)
{
_source = source;
}
