ScreenToGif/ImageUtil/Decoder/GifBlock.cs

（完整代码） 1016B 

using System.Collections.Generic;
using System.IO;

namespace ScreenToGif.ImageUtil.Decoder
{
    public abstract class GifBlock
    {
        public 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);
            }
        }

        public abstract GifBlockKind Kind { get; }
    }
}

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