internal static GifApplicationExtension ReadApplication(Stream stream) { var ext = new GifApplicationExtension(); ext.Read(stream); return(ext); }
internal static GifExtension ReadExtension(Stream stream, IEnumerable <GifExtension> controlExtensions, bool metadataOnly) { // Note: at this point, the Extension Introducer (0x21) has already been read var label = stream.ReadByte(); if (label < 0) { throw GifHelpers.UnexpectedEndOfStreamException(); } return(label switch { GifGraphicControlExtension.ExtensionLabel => (GifExtension)GifGraphicControlExtension.ReadGraphicsControl(stream), GifCommentExtension.ExtensionLabel => GifCommentExtension.ReadComment(stream), GifPlainTextExtension.ExtensionLabel => GifPlainTextExtension.ReadPlainText(stream, controlExtensions, metadataOnly), GifApplicationExtension.ExtensionLabel => GifApplicationExtension.ReadApplication(stream), _ => throw GifHelpers.UnknownExtensionTypeException(label) });
public static ushort GetRepeatCount(GifApplicationExtension ext) { return(ext.Data?.Length >= 3 ? BitConverter.ToUInt16(ext.Data, 1) : (ushort)1); }
public static bool IsNetscapeExtension(GifApplicationExtension ext) { return(ext.ApplicationIdentifier == "NETSCAPE" && Encoding.ASCII.GetString(ext.AuthenticationCode ?? Array.Empty <byte>()) == "2.0"); }