async ValueTask ReadChunks(long chunkTableOffset, int chunkCount)
{
if (ChunkReader is null)
{
throw new InvalidOperationException();
}
var chunkTable = new byte[(chunkCount + 1) * (4 + sizeof(long))];
if (await ChunkReader.ReadAtAsync(chunkTableOffset, chunkTable).ConfigureAwait(false) != chunkTable.Length)
{
return;
}
_chunks = Enumerable.Range(0, chunkCount + 1).Select(i => new Chunk
{
Name = (i < chunkCount) ? Encoding.ASCII.GetString(chunkTable, 12 * i, 4) : null,
Position = NetBitConverter.ToInt64(chunkTable, 12 * i + 4)
}).ToArray();
for (int i = 0; i < chunkCount; i++)
{
_chunks[i].Length = _chunks[i + 1].Position - _chunks[i].Position;
}
FanOut = await ReadFanOutAsync().ConfigureAwait(false);
}
private async ValueTask <long> ReadCommitTimeOffset(uint index)
{
var offsetData = new byte[sizeof(int)];
if (offsetData.Length != await ReadFromChunkAsync("GDA2", index * sizeof(int), offsetData).ConfigureAwait(false))
{
return(long.MinValue);
}
int v = NetBitConverter.ToInt32(offsetData, 0);
if (v >= 0)
{
return(v);
}
offsetData = new byte[sizeof(long)];
if (offsetData.Length != await ReadFromChunkAsync("GDO2", (~v) * sizeof(long), offsetData).ConfigureAwait(false))
{
return(long.MinValue);
}
return(NetBitConverter.ToInt64(offsetData, 0));
}
private static DateTime ToDateTime(byte[] bytes, int startIndex)
{
var l = NetBitConverter.ToInt64(bytes, startIndex);
return(DateTimeUtil.UnixTimestampToDateTime(l));
}
private static DateTime ToDateTime(byte[] bytes, int startIndex)
{
var l = NetBitConverter.ToInt64(bytes, startIndex);
return(DateTime.FromBinary(l));
}