internal static GifBlock ReadBlock(
Stream stream,
IEnumerable <GifExtension> controlExtensions,
bool metadataOnly)
{
int blockId = stream.ReadByte();
if (blockId < 0)
{
throw GifHelpers.UnexpectedEndOfStreamException();
}
if (blockId == 33)
{
return((GifBlock)GifExtension.ReadExtension(stream, controlExtensions, metadataOnly));
}
if (blockId == 44)
{
return((GifBlock)GifFrame.ReadFrame(stream, controlExtensions, metadataOnly));
}
if (blockId == 59)
{
return((GifBlock)GifTrailer.ReadTrailer());
}
throw GifHelpers.UnknownBlockTypeException(blockId);
}
private void Read(Stream stream)
{
byte[] bytes = GifHelpers.ReadDataBlocks(stream, false);
if (bytes == null)
{
return;
}
this.Text = Encoding.ASCII.GetString(bytes);
}
private void Read(
Stream stream,
IEnumerable <GifExtension> controlExtensions,
bool metadataOnly)
{
this.Descriptor = GifImageDescriptor.ReadImageDescriptor(stream);
if (this.Descriptor.HasLocalColorTable)
{
this.LocalColorTable = GifHelpers.ReadColorTable(stream, this.Descriptor.LocalColorTableSize);
}
this.ImageData = GifImageData.ReadImageData(stream, metadataOnly);
this.Extensions = (IList <GifExtension>)controlExtensions.ToList <GifExtension>().AsReadOnly();
}
private void Read(Stream stream)
{
this.Signature = GifHelpers.ReadString(stream, 3);
if (this.Signature != "GIF")
{
throw GifHelpers.InvalidSignatureException(this.Signature);
}
this.Version = GifHelpers.ReadString(stream, 3);
if (this.Version != "87a" && this.Version != "89a")
{
throw GifHelpers.UnsupportedVersionException(this.Version);
}
this.LogicalScreenDescriptor = GifLogicalScreenDescriptor.ReadLogicalScreenDescriptor(stream);
}
private void Read(Stream stream)
{
byte[] numArray1 = new byte[12];
stream.ReadAll(numArray1, 0, numArray1.Length);
this.BlockSize = (int)numArray1[0];
if (this.BlockSize != 11)
{
throw GifHelpers.InvalidBlockSizeException("Application Extension", 11, this.BlockSize);
}
this.ApplicationIdentifier = Encoding.ASCII.GetString(numArray1, 1, 8);
byte[] numArray2 = new byte[3];
Array.Copy((Array)numArray1, 9, (Array)numArray2, 0, 3);
this.AuthenticationCode = numArray2;
this.Data = GifHelpers.ReadDataBlocks(stream, false);
}
private void Read(Stream stream)
{
byte[] buffer = new byte[6];
stream.ReadAll(buffer, 0, buffer.Length);
this.BlockSize = (int)buffer[0];
if (this.BlockSize != 4)
{
throw GifHelpers.InvalidBlockSizeException("Graphic Control Extension", 4, this.BlockSize);
}
byte num = buffer[1];
this.DisposalMethod = ((int)num & 28) >> 2;
this.UserInput = ((uint)num & 2U) > 0U;
this.HasTransparency = ((uint)num & 1U) > 0U;
this.Delay = (int)BitConverter.ToUInt16(buffer, 2) * 10;
this.TransparencyIndex = (int)buffer[4];
}
private void Read(
Stream stream,
IEnumerable <GifExtension> controlExtensions,
bool metadataOnly)
{
byte[] buffer = new byte[13];
stream.ReadAll(buffer, 0, buffer.Length);
this.BlockSize = (int)buffer[0];
if (this.BlockSize != 12)
{
throw GifHelpers.InvalidBlockSizeException("Plain Text Extension", 12, this.BlockSize);
}
this.Left = (int)BitConverter.ToUInt16(buffer, 1);
this.Top = (int)BitConverter.ToUInt16(buffer, 3);
this.Width = (int)BitConverter.ToUInt16(buffer, 5);
this.Height = (int)BitConverter.ToUInt16(buffer, 7);
this.CellWidth = (int)buffer[9];
this.CellHeight = (int)buffer[10];
this.ForegroundColorIndex = (int)buffer[11];
this.BackgroundColorIndex = (int)buffer[12];
this.Text = Encoding.ASCII.GetString(GifHelpers.ReadDataBlocks(stream, metadataOnly));
this.Extensions = (IList <GifExtension>)controlExtensions.ToList <GifExtension>().AsReadOnly();
}
private void Read(Stream stream, bool metadataOnly)
{
this.LzwMinimumCodeSize = (byte)stream.ReadByte();
this.CompressedData = GifHelpers.ReadDataBlocks(stream, metadataOnly);
}
