/// <summary>
/// Parse the header of a chunk, with that we know the <see cref="ChunkType"/> and the length of the chunk
/// Took extra caution because there is no <see cref="SubStream"/> to protect the reading.
/// When I discover the length of the replay, I immediatly create a SubStream so i can protect the rest of the replay.
/// </summary>
/// <param name="replayInfo"></param>
/// <returns></returns>
public virtual async ValueTask <ChunkHeader> ParseChunkHeader()
{
if (SubStreamFactory.CanReadLength && SubStreamFactory.CanReadPosition &&
SubStreamFactory.BaseStream.Position == SubStreamFactory.BaseStream.Length)
{
return(new ChunkHeader {
ChunkType = ChunkType.EndOfStream, ChunkSize = 0
});
}
int chunkSize;
ChunkType chunkType;
await using (SubStream chunkHeader = SubStreamFactory.CreateSubstream(8))
await using (CustomBinaryReaderAsync customReader = new CustomBinaryReaderAsync(chunkHeader, true))
{
try //TODO add case when you can seek.
{
chunkType = (ChunkType)await customReader.ReadUInt32Async();
}
catch (EndOfStreamException)
{
chunkHeader.CancelSelfRepositioning();
return(new ChunkHeader {
ChunkType = ChunkType.EndOfStream, ChunkSize = 0
});
}
chunkSize = await customReader.ReadInt32Async();
if ((uint)chunkType > 3)
{
return(new ChunkHeader {
ChunkType = ChunkType.Unknown, ChunkSize = 0
});
}
}
return(new ChunkHeader {
ChunkType = chunkType, ChunkSize = chunkSize
});
}
