public static AbstractChunk From(Stream stream)
{
AbstractChunk chunk;
Span <byte> buffer = stackalloc byte[4];
stream.Read(buffer);
if (BitConverter.IsLittleEndian)
{
buffer.Reverse();
}
int length = (int)Unsafe.ReadUnaligned <uint>(ref MemoryMarshal.GetReference(buffer));
stream.Read(buffer);
string type = Encoding.ASCII.GetString(buffer);
switch (type)
{
case "tEXt":
chunk = new TextualChunk();
break;
default:
chunk = new RawChunk();
break;
}
chunk.Length = length;
chunk.Type = type;
chunk.HandleChunkData(stream);
stream.Read(buffer);
if (BitConverter.IsLittleEndian)
{
buffer.Reverse();
}
chunk.Crc = Unsafe.ReadUnaligned <uint>(ref MemoryMarshal.GetReference(buffer));
return(chunk);
}
public void AddTextualData(string keyword, string text)
{
TextualChunk textualChunk = new TextualChunk(keyword, text);
Chunks.Insert(Chunks.Count - 2, textualChunk);
}