public void Write(Stream file)
{
var encoder = new PngBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(m_bitmap));
using (var png = new MemoryStream())
using (var cwp = new BinaryWriter(file, System.Text.Encoding.ASCII, true))
{
encoder.Save(png);
var header = new byte[0x11];
png.Position = 0x10;
png.Read(header, 0, header.Length);
cwp.Write(0x50445743u); // 'CWDP'
cwp.Write(header, 0, header.Length);
long idat;
using (var bin = new BinMemoryStream(png, ""))
idat = PngFormat.FindChunk(bin, "IDAT");
if (-1 == idat)
{
throw new InvalidFormatException("CWP conversion failed");
}
png.Position = idat;
png.Read(header, 0, 8);
int chunk_size = BigEndian.ToInt32(header, 0) + 4;
cwp.Write(header, 0, 4);
for (;;)
{
CopyChunk(png, file, chunk_size);
if (8 != png.Read(header, 0, 8))
{
throw new InvalidFormatException("CWP conversion failed");
}
if (Binary.AsciiEqual(header, 4, "IEND"))
{
cwp.Write((byte)0);
break;
}
chunk_size = BigEndian.ToInt32(header, 0) + 4;
cwp.Write(header, 0, 8);
}
}
}