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static private ConvertEndian ( |
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/// <summary>
/// Gets the frame as PNG FileStream.
/// </summary>
public MemoryStream GetStream()
{
var ihdrChunk = new IHDRChunk(IHDRChunk);
if (fcTLChunk != null)
{
// Fix frame size with fcTL data.
ihdrChunk.ModifyChunkData(0, Helper.ConvertEndian(fcTLChunk.Width));
ihdrChunk.ModifyChunkData(4, Helper.ConvertEndian(fcTLChunk.Height));
}
// Write image data
using (var ms = new MemoryStream())
{
ms.WriteBytes(Signature);
ms.WriteBytes(ihdrChunk.RawData);
foreach (IDATChunk idatChunk in idatChunks)
{
ms.WriteBytes(idatChunk.RawData);
}
foreach (ITextChunk chunk in TextChunks)
{
ms.WriteBytes((chunk as Chunk).RawData);
}
ms.WriteBytes(IENDChunk.RawData);
ms.Position = 0;
return(ms);
}
}
internal Chunk(MemoryStream ms)
{
Length = Helper.ConvertEndian(ms.ReadUInt32());
ChunkType = Encoding.ASCII.GetString(ms.ReadBytes(4));
ChunkData = ms.ReadBytes((int)Length);
Crc = Helper.ConvertEndian(ms.ReadUInt32());
ParseData(new MemoryStream(ChunkData));
}
protected override void ParseData(MemoryStream ms)
{
Width = Helper.ConvertEndian(ms.ReadInt32());
Height = Helper.ConvertEndian(ms.ReadInt32());
BitDepth = Convert.ToByte(ms.ReadByte());
ColorType = Convert.ToByte(ms.ReadByte());
CompressionMethod = Convert.ToByte(ms.ReadByte());
FilterMethod = Convert.ToByte(ms.ReadByte());
InterlaceMethod = Convert.ToByte(ms.ReadByte());
}
protected override void ParseData(MemoryStream ms)
{
SequenceNumber = Helper.ConvertEndian(ms.ReadUInt32());
Width = Helper.ConvertEndian(ms.ReadUInt32());
Height = Helper.ConvertEndian(ms.ReadUInt32());
XOffset = Helper.ConvertEndian(ms.ReadUInt32());
YOffset = Helper.ConvertEndian(ms.ReadUInt32());
DelayNum = Helper.ConvertEndian(ms.ReadUInt16());
DelayDen = Helper.ConvertEndian(ms.ReadUInt16());
DisposeOp = (DisposeOps)ms.ReadByte();
BlendOp = (BlendOps)ms.ReadByte();
}
internal Chunk(byte[] bytes)
{
var ms = new MemoryStream(bytes);
Length = Helper.ConvertEndian(ms.ReadUInt32());
ChunkType = Encoding.ASCII.GetString(ms.ReadBytes(4));
ChunkData = ms.ReadBytes((int)Length);
Crc = Helper.ConvertEndian(ms.ReadUInt32());
if (ms.Position != ms.Length)
{
throw new Exception("Chunk length not correct.");
}
if (Length != ChunkData.Length)
{
throw new Exception("Chunk data length not correct.");
}
ParseData(new MemoryStream(ChunkData));
}
public IDATChunk ToIDATChunk()
{
uint newCrc;
using (var msCrc = new MemoryStream())
{
msCrc.WriteBytes(new[] { (byte)'I', (byte)'D', (byte)'A', (byte)'T' });
msCrc.WriteBytes(FrameData);
newCrc = CrcHelper.Calculate(msCrc.ToArray());
}
using (var ms = new MemoryStream())
{
ms.WriteUInt32(Helper.ConvertEndian(Length - 4));
ms.WriteBytes(new[] { (byte)'I', (byte)'D', (byte)'A', (byte)'T' });
ms.WriteBytes(FrameData);
ms.WriteUInt32(Helper.ConvertEndian(newCrc));
ms.Position = 0;
return(new IDATChunk(ms));
}
}
/// <summary>
/// Gets the frame as PNG FileStream.
/// </summary>
public MemoryStream GetStream()
{
var ihdrChunk = new IHDRChunk(IHDRChunk);
if (fcTLChunk != null)
{
// Fix frame size with fcTL data.
ihdrChunk.ModifyChunkData(0, Helper.ConvertEndian(fcTLChunk.Width));
ihdrChunk.ModifyChunkData(4, Helper.ConvertEndian(fcTLChunk.Height));
}
// Write image data
using (var ms = new MemoryStream())
{
ms.WriteBytes(Signature);
ms.WriteBytes(ihdrChunk.RawData);
otherChunks.ForEach(o => ms.WriteBytes(o.RawData));
idatChunks.ForEach(i => ms.WriteBytes(i.RawData));
ms.WriteBytes(IENDChunk.RawData);
ms.Position = 0;
return(ms);
}
}
protected override void ParseData(MemoryStream ms)
{
NumFrames = Helper.ConvertEndian(ms.ReadUInt32());
NumPlays = Helper.ConvertEndian(ms.ReadUInt32());
}
protected override void ParseData(MemoryStream ms)
{
SequenceNumber = Helper.ConvertEndian(ms.ReadUInt32());
FrameData = ms.ReadBytes((int)Length - 4);
}
