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());
}
