internal static GifApplicationExtensionBlock Create(GifReader reader)
{
GifApplicationExtensionBlock gifApplicationExtensionBlock = new GifApplicationExtensionBlock(reader);
if (gifApplicationExtensionBlock.ApplicationIdentifier.Equals("NETSCAPE") && gifApplicationExtensionBlock.ApplicationAuthenticationCode.Equals("2.0"))
{
if ((null != gifApplicationExtensionBlock.Bytes))
{
if ((3 == gifApplicationExtensionBlock.Bytes.Length) && (1 == gifApplicationExtensionBlock.Bytes[0]))
{
gifApplicationExtensionBlock = new GifNetscapeLoopingApplicationExtensionBlock(gifApplicationExtensionBlock);
}
else if ((5 == gifApplicationExtensionBlock.Bytes.Length) && (2 == gifApplicationExtensionBlock.Bytes[0]))
{
gifApplicationExtensionBlock = new GifNetscapeBufferingApplicationExtensionBlock(gifApplicationExtensionBlock);
}
}
}
else if (gifApplicationExtensionBlock.ApplicationIdentifier.Equals("ANIMEXTS") && gifApplicationExtensionBlock.ApplicationAuthenticationCode.Equals("1.0"))
{
if ((null != gifApplicationExtensionBlock.Bytes) && (3 == gifApplicationExtensionBlock.Bytes.Length) && (1 == gifApplicationExtensionBlock.Bytes[0]))
{
gifApplicationExtensionBlock = new GifAnimextsLoopingApplicationExtensionBlock(gifApplicationExtensionBlock);
}
}
return(gifApplicationExtensionBlock);
}
internal GifAnimextsLoopingApplicationExtensionBlock(GifApplicationExtensionBlock gifApplicationExtensionBlock)
: base(GifBlockType.AnimextsLoopingApplicationExtension)
{
applicationIdentifier = gifApplicationExtensionBlock.ApplicationIdentifier;
applicationAuthenticationCode = gifApplicationExtensionBlock.ApplicationAuthenticationCode;
bytes = gifApplicationExtensionBlock.Bytes;
if ((null == bytes) || (bytes.Length != 3) || (bytes[0] != 1))
{
System.Diagnostics.Debug.WriteLine("Wrong format of " + ToString());
}
loopCount = (UInt16)(((UInt16)bytes[2] << 8) | (UInt16)bytes[1]);
}
internal GifAnimextsLoopingApplicationExtensionBlock(GifApplicationExtensionBlock gifApplicationExtensionBlock)
: base(GifBlockType.AnimextsLoopingApplicationExtension)
{
applicationIdentifier = gifApplicationExtensionBlock.ApplicationIdentifier;
applicationAuthenticationCode = gifApplicationExtensionBlock.ApplicationAuthenticationCode;
bytes = gifApplicationExtensionBlock.Bytes;
if ((null == bytes) || (bytes.Length != 3) || (bytes[0] != 1))
{
System.Diagnostics.Debug.WriteLine("Wrong format of " + ToString());
}
loopCount = (UInt16)(((UInt16)bytes[2] << 8) | (UInt16)bytes[1]);
}
internal GifNetscapeBufferingApplicationExtensionBlock(GifApplicationExtensionBlock gifApplicationExtensionBlock)
: base(GifBlockType.NetscapeLoopingApplicationExtension)
{
applicationIdentifier = gifApplicationExtensionBlock.ApplicationIdentifier;
applicationAuthenticationCode = gifApplicationExtensionBlock.ApplicationAuthenticationCode;
bytes = gifApplicationExtensionBlock.Bytes;
if ((null == bytes) || (bytes.Length != 5) || (bytes[0] != 2))
{
System.Diagnostics.Debug.WriteLine("Wrong format of " + ToString());
}
bufferSize = (UInt32)(((UInt32)bytes[4] << 24) | ((UInt32)bytes[3] << 16) | ((UInt32)bytes[2] << 8) | (UInt32)bytes[1]);
}
internal GifNetscapeBufferingApplicationExtensionBlock(GifApplicationExtensionBlock gifApplicationExtensionBlock)
: base(GifBlockType.NetscapeLoopingApplicationExtension)
{
applicationIdentifier = gifApplicationExtensionBlock.ApplicationIdentifier;
applicationAuthenticationCode = gifApplicationExtensionBlock.ApplicationAuthenticationCode;
bytes = gifApplicationExtensionBlock.Bytes;
if ((null == bytes) || (bytes.Length != 5) || (bytes[0] != 2))
{
System.Diagnostics.Debug.WriteLine("Wrong format of " + ToString());
}
bufferSize = (UInt32)(((UInt32)bytes[4] << 24) | ((UInt32)bytes[3] << 16) | ((UInt32)bytes[2] << 8) | (UInt32)bytes[1]);
}
internal static GifApplicationExtensionBlock Create(GifReader reader)
{
GifApplicationExtensionBlock gifApplicationExtensionBlock = new GifApplicationExtensionBlock(reader);
if (gifApplicationExtensionBlock.ApplicationIdentifier.Equals("NETSCAPE") && gifApplicationExtensionBlock.ApplicationAuthenticationCode.Equals("2.0"))
{
if ((null != gifApplicationExtensionBlock.Bytes))
{
if ((3 == gifApplicationExtensionBlock.Bytes.Length) && (1 == gifApplicationExtensionBlock.Bytes[0]))
{
gifApplicationExtensionBlock = new GifNetscapeLoopingApplicationExtensionBlock(gifApplicationExtensionBlock);
}
else if ((5 == gifApplicationExtensionBlock.Bytes.Length) && (2 == gifApplicationExtensionBlock.Bytes[0]))
{
gifApplicationExtensionBlock = new GifNetscapeBufferingApplicationExtensionBlock(gifApplicationExtensionBlock);
}
}
}
else if (gifApplicationExtensionBlock.ApplicationIdentifier.Equals("ANIMEXTS") && gifApplicationExtensionBlock.ApplicationAuthenticationCode.Equals("1.0"))
{
if ((null != gifApplicationExtensionBlock.Bytes) && (3 == gifApplicationExtensionBlock.Bytes.Length) && (1 == gifApplicationExtensionBlock.Bytes[0]))
{
gifApplicationExtensionBlock = new GifAnimextsLoopingApplicationExtensionBlock(gifApplicationExtensionBlock);
}
}
return gifApplicationExtensionBlock;
}
static private void DumpBlock(GifBlock gifBlock)
{
GifExtensionBlock gifUnknownBlock = gifBlock as GifExtensionBlock;
if (gifUnknownBlock != null)
{
Console.WriteLine("\tLength:\t\t\t\t" + gifUnknownBlock.Bytes.Length);
}
GifHeaderBlock gifHeaderBlock = gifBlock as GifHeaderBlock;
if (gifHeaderBlock != null)
{
Console.WriteLine("\tVersion:\t\t\t" + gifHeaderBlock.Version);
}
GifLogicalScreenDescriptorBlock gifLogicalScreenDescriptorBlock = gifBlock as GifLogicalScreenDescriptorBlock;
if (gifLogicalScreenDescriptorBlock != null)
{
Console.WriteLine("\tWidth:\t\t\t\t" + gifLogicalScreenDescriptorBlock.Width);
Console.WriteLine("\tHeight:\t\t\t\t" + gifLogicalScreenDescriptorBlock.Height);
Console.WriteLine("\tGlobalColorTableFlag:\t\t" + gifLogicalScreenDescriptorBlock.GlobalColorTableFlag);
Console.WriteLine("\tColorResolution:\t\t" + gifLogicalScreenDescriptorBlock.ColorResolution);
Console.WriteLine("\tGlobalColorTableSorted:\t\t" + gifLogicalScreenDescriptorBlock.GlobalColorTableSorted);
Console.WriteLine("\tGlobalColorTableSize:\t\t" + gifLogicalScreenDescriptorBlock.GlobalColorTableSize);
Console.WriteLine("\tBackgroundColorIndex:\t\t" + gifLogicalScreenDescriptorBlock.BackgroundColorIndex);
Console.WriteLine("\tPixelAspectRatio:\t\t" + gifLogicalScreenDescriptorBlock.PixelAspectRatio);
}
GifGlobalColorTableBlock gifGlobalColorTableBlock = gifBlock as GifGlobalColorTableBlock;
if (gifGlobalColorTableBlock != null)
{
Console.WriteLine("\tLength:\t\t\t\t" + gifGlobalColorTableBlock.Bytes.Length);
}
GifImageDescriptorBlock gifImageDescriptorBlock = gifBlock as GifImageDescriptorBlock;
if (gifImageDescriptorBlock != null)
{
Console.WriteLine("\tLeft:\t\t\t\t" + gifImageDescriptorBlock.Left);
Console.WriteLine("\tTop:\t\t\t\t" + gifImageDescriptorBlock.Top);
Console.WriteLine("\tWidth:\t\t\t\t" + gifImageDescriptorBlock.Width);
Console.WriteLine("\tHeight:\t\t\t\t" + gifImageDescriptorBlock.Height);
Console.WriteLine("\tInterlaced:\t\t\t" + gifImageDescriptorBlock.Interlaced);
Console.WriteLine("\tLocalColorTableFlag:\t\t" + gifImageDescriptorBlock.LocalColorTableFlag);
Console.WriteLine("\tLocalColorTableSorted:\t\t" + gifImageDescriptorBlock.LocalColorTableSorted);
Console.WriteLine("\tLocalColorTableSize:\t\t" + gifImageDescriptorBlock.LocalColorTableSize);
}
GifLocalColorTableBlock gifLocalColorTableBlock = gifBlock as GifLocalColorTableBlock;
if (gifLocalColorTableBlock != null)
{
Console.WriteLine("\tLength:\t\t\t\t" + gifLocalColorTableBlock.Bytes.Length);
}
GifTableBasedImageDataBlock gifTableBasedImageDataBlock = gifBlock as GifTableBasedImageDataBlock;
if (gifTableBasedImageDataBlock != null)
{
Console.WriteLine("\tLzwMinimumCodeSize:\t\t" + gifTableBasedImageDataBlock.LzwMinimumCodeSize);
Console.WriteLine("\tLength:\t\t\t\t" + gifTableBasedImageDataBlock.ImageData.Length);
}
GifGraphicControExtensionBlock gifGraphicControExtensionBlock = gifBlock as GifGraphicControExtensionBlock;
if (gifGraphicControExtensionBlock != null)
{
Console.WriteLine("\tDisposalMethod:\t\t\t" + gifGraphicControExtensionBlock.DisposalMethod + " (" + (int)gifGraphicControExtensionBlock.DisposalMethod + ")");
Console.WriteLine("\tUserInputExpected:\t\t" + gifGraphicControExtensionBlock.UserInputExpected);
Console.WriteLine("\tTransparency:\t\t\t" + gifGraphicControExtensionBlock.Transparency);
Console.WriteLine("\tDelay:\t\t\t\t" + gifGraphicControExtensionBlock.Delay);
Console.WriteLine("\tTransparencyIndex:\t\t" + gifGraphicControExtensionBlock.TransparencyIndex);
}
GifCommentExtensionBlock gifCommentExtensionBlock = gifBlock as GifCommentExtensionBlock;
if (gifCommentExtensionBlock != null)
{
Console.WriteLine("\tComment:\t\t\t" + gifCommentExtensionBlock.Comment);
}
GifPlainTextExtensionBlock gifPlainTextExtensionBlock = gifBlock as GifPlainTextExtensionBlock;
if (gifPlainTextExtensionBlock != null)
{
Console.WriteLine("\tLeft:\t\t\t\t" + gifPlainTextExtensionBlock.Left);
Console.WriteLine("\tTop:\t\t\t\t" + gifPlainTextExtensionBlock.Top);
Console.WriteLine("\tWidth:\t\t\t\t" + gifPlainTextExtensionBlock.Width);
Console.WriteLine("\tHeight:\t\t\t\t" + gifPlainTextExtensionBlock.Height);
Console.WriteLine("\tCellWidth:\t\t\t" + gifPlainTextExtensionBlock.CellWidth);
Console.WriteLine("\tCellHeight:\t\t\t" + gifPlainTextExtensionBlock.CellHeight);
Console.WriteLine("\tForegroundColor:\t\t" + gifPlainTextExtensionBlock.ForegroundColor);
Console.WriteLine("\tBackgroundColor:\t\t" + gifPlainTextExtensionBlock.BackgroundColor);
Console.WriteLine("\tText:\t\t\t" + gifPlainTextExtensionBlock.Text);
}
GifApplicationExtensionBlock gifApplicationExtensionBlock = gifBlock as GifApplicationExtensionBlock;
if (gifApplicationExtensionBlock != null)
{
Console.WriteLine("\tApplicationIdentifier:\t\t" + gifApplicationExtensionBlock.ApplicationIdentifier);
Console.WriteLine("\tApplicationAuthenticationCode:\t" + gifApplicationExtensionBlock.ApplicationAuthenticationCode);
}
GifNetscapeLoopingApplicationExtensionBlock gifNetscapeExtensionBlock = gifBlock as GifNetscapeLoopingApplicationExtensionBlock;
if (gifNetscapeExtensionBlock != null)
{
Console.WriteLine("\tLoopCount:\t\t\t" + gifNetscapeExtensionBlock.LoopCount);
}
GifNetscapeBufferingApplicationExtensionBlock gifNetscapeBufferingExtensionBlock = gifBlock as GifNetscapeBufferingApplicationExtensionBlock;
if (gifNetscapeBufferingExtensionBlock != null)
{
Console.WriteLine("\tBufferSize:\t\t\t" + gifNetscapeBufferingExtensionBlock.BufferSize);
}
GifAnimextsLoopingApplicationExtensionBlock gifAnimextsLoopingExtensionBlock = gifBlock as GifAnimextsLoopingApplicationExtensionBlock;
if (gifAnimextsLoopingExtensionBlock != null)
{
Console.WriteLine("\tLoopCount:\t\t\t" + gifAnimextsLoopingExtensionBlock.LoopCount);
}
}
public void Read(Stream stream)
{
blocks.Clear();
// reader
GifReader reader = new GifReader(stream);
// Header
AddBlock(new GifHeaderBlock(reader));
// Logical Screen Descriptor
GifLogicalScreenDescriptorBlock gifLogicalScreenDescriptorBlock = new GifLogicalScreenDescriptorBlock(reader);
AddBlock(gifLogicalScreenDescriptorBlock);
// Global Color Table
if (gifLogicalScreenDescriptorBlock.GlobalColorTableFlag)
{
AddBlock(new GifGlobalColorTableBlock(reader, gifLogicalScreenDescriptorBlock));
}
// Segments
while (true)
{
Byte identifier = reader.ReadByte();
switch (identifier)
{
// Frames
case 0x2C:
GifImageDescriptorBlock gifImageDescriptorBlock = new GifImageDescriptorBlock(reader);
AddBlock(gifImageDescriptorBlock);
if (gifImageDescriptorBlock.LocalColorTableFlag)
{
AddBlock(new GifLocalColorTableBlock(reader, gifImageDescriptorBlock));
}
AddBlock(new GifTableBasedImageDataBlock(reader));
break;
// Extensions
case 0x21:
Byte label = reader.ReadByte();
switch (label)
{
case 0xF9:
AddBlock(new GifGraphicControExtensionBlock(reader));
break;
case 0xFE:
AddBlock(new GifCommentExtensionBlock(reader));
break;
case 0x01:
AddBlock(new GifPlainTextExtensionBlock(reader));
break;
case 0xFF:
AddBlock(GifApplicationExtensionBlock.Create(reader));
break;
default:
AddBlock(new GifExtensionBlock(label, reader));
break;
}
break;
// Trailer
case 0x3B:
AddBlock(new GifTrailerBlock());
return;
default:
throw new Exception("Unknown segment identifier: 0x" + identifier.ToString("X2"));
}
}
}
