/// <summary>
/// Converts an FDAT Chunk to an IDAT Chunk.
/// </summary>
/// <returns>The IDAT chunk.</returns>
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));
}
}