/// TaObチャンクを書き込みます。
protected void WriteTaOb(string type, uint opt0, uint opt1, byte[] data)
{
//Console.WriteLine("WriteTaOb {0}", type);
//Console.WriteLine("taOb extract length {0}", data.Length);
byte[] chunk_type = System.Text.Encoding.ASCII.GetBytes(type);
MemoryStream dest = new MemoryStream();
using (DeflaterOutputStream gzip = new DeflaterOutputStream(dest))
{
gzip.IsStreamOwner = false;
gzip.Write(data, 0, data.Length);
}
dest.Seek(0, SeekOrigin.Begin);
//Console.WriteLine("taOb length {0}", dest.Length);
byte[] chunk_data = new byte[dest.Length + 20];
Array.Copy(chunk_type, 0, chunk_data, 0, 4);
byte[] buf;
buf = BitConverter.GetBytes((UInt32)opt0);
Array.Copy(buf, 0, chunk_data, 4, 4);
buf = BitConverter.GetBytes((UInt32)opt1);
Array.Copy(buf, 0, chunk_data, 8, 4);
buf = BitConverter.GetBytes((UInt32)data.Length);
Array.Copy(buf, 0, chunk_data, 12, 4);
buf = BitConverter.GetBytes((UInt32)dest.Length);
Array.Copy(buf, 0, chunk_data, 16, 4);
dest.Read(chunk_data, 20, (int)dest.Length);
PNGWriter.WriteChunk(writer, "taOb", chunk_data);
}
/// <summary>
/// 指定ストリームに保存します。
/// </summary>
/// <param name="dest_stream">ストリーム</param>
public void Save(Stream dest_stream)
{
BinaryWriter bw = new BinaryWriter(dest_stream, System.Text.Encoding.Default);
PNGWriter.Write(bw, header);
PNGWriter.WriteIHDR(bw, ihdr);
foreach (byte[] idat in IdatList)
{
PNGWriter.WriteIDAT(bw, idat);
}
if (WriteTaOb != null)
{
WriteTaOb(bw);
}
PNGWriter.WriteIEND(bw);
}