private void ReadFrames(Stream stream, bool metadataOnly) { List <GifFrame> list = new List <GifFrame>(); List <GifExtension> controlExtensions = new List <GifExtension>(); List <GifExtension> list3 = new List <GifExtension>(); while (true) { GifBlock block = GifBlock.ReadBlock(stream, controlExtensions, metadataOnly); if (block.Kind == GifBlockKind.GraphicRendering) { controlExtensions = new List <GifExtension>(); } if (block is GifFrame) { list.Add((GifFrame)block); } else if (!(block is GifExtension)) { if (block is GifTrailer) { this.Frames = list.AsReadOnly(); this.Extensions = list3.AsReadOnly(); return; } } else { GifExtension item = (GifExtension)block; switch (item.Kind) { case GifBlockKind.Control: controlExtensions.Add(item); break; case GifBlockKind.SpecialPurpose: list3.Add(item); break; default: break; } } } }
internal static GifBlock ReadBlock(Stream stream, IEnumerable <GifExtension> controlExtensions, bool metadataOnly) { int blockId = stream.ReadByte(); if (blockId < 0) { throw GifHelpers.UnexpectedEndOfStreamException(); } switch (blockId) { case GifExtension.ExtensionIntroducer: return(GifExtension.ReadExtension(stream, controlExtensions, metadataOnly)); case GifFrame.ImageSeparator: return(GifFrame.ReadFrame(stream, controlExtensions, metadataOnly)); case GifTrailer.TrailerByte: return(GifTrailer.ReadTrailer()); default: throw GifHelpers.UnknownBlockTypeException(blockId); } }
internal static GifBlock ReadBlock(Stream stream, IEnumerable <GifExtension> controlExtensions, bool metadataOnly) { int blockId = stream.ReadByte(); if (blockId < 0) { throw GifHelpers.UnexpectedEndOfStreamException(); } int num2 = blockId; if (num2 == 0x21) { return(GifExtension.ReadExtension(stream, controlExtensions, metadataOnly)); } if (num2 == 0x2c) { return(GifFrame.ReadFrame(stream, controlExtensions, metadataOnly)); } if (num2 != 0x3b) { throw GifHelpers.UnknownBlockTypeException(blockId); } return(GifTrailer.ReadTrailer()); }