internal AtomEvent(string name, AtomTypeFlags flags, long size, long dataSize)
{
Name = name;
Flags = flags;
Size = size;
DataSize = dataSize;
}
/// <summary>
/// Read atom header, add known flags.
/// </summary>
private AtomEvent ReadAtom()
{
// get size
uint sizeShort;
if (!TryReadUint(out sizeShort))
{
return(null); // end of stream
}
long size = sizeShort;
long dataSize = size - 8; // header length
// get type
string name = ReadAsciiStr(4);
if (string.IsNullOrEmpty(name))
{
return(null);
}
// check for wide atom
if (sizeShort == 0)
{
// Should not be hard to support it but dont need it yet.
throw new InvalidOperationException("Open atom not supported.");
}
if (sizeShort == 1)
{
// wide atom (should be "mdat")
ulong sizeLong;
if (!TryReadUlong(out sizeLong))
{
return(null); // end of stream
}
size = (long)sizeLong; // better to have size ulong, bot other methods expect long
dataSize = size - 16;
}
// get known flags
AtomTypeFlags flags = AtomTypeFlags.None;
AtomType type = Types.GetValueOrDefault(name);
if (type != null)
{
flags = type.Flags;
}
return(new AtomEvent(name, flags, size, dataSize));
}
public AtomType(string name, AtomTypeFlags flags)
{
Name = name;
Flags = flags;
}