internal static void SkipHeader(ref SpanReader reader)
{
var magic = reader.ReadByteArrayRaw(MagicStartOfFile.Length);
var withGuid = BitArrayManipulation.CompareByteArray(magic, magic.Length,
MagicStartOfFileWithGuid, MagicStartOfFileWithGuid.Length) == 0;
if (withGuid)
{
reader.SkipGuid();
}
}
void LoadInfoAboutFiles()
{
foreach (var file in _fileCollection.Enumerate())
{
try
{
var readerController = file.GetExclusiveReader();
var reader = new SpanReader(readerController);
var magic = reader.ReadByteArrayRaw(MagicStartOfFile.Length);
Guid?guid = null;
if (
BitArrayManipulation.CompareByteArray(magic, magic.Length, MagicStartOfFileWithGuid,
MagicStartOfFileWithGuid.Length) == 0)
{
guid = reader.ReadGuid();
if (Guid.HasValue && Guid.Value != guid)
{
_fileInfos.TryAdd(file.Index, UnknownFile.Instance);
continue;
}
Guid = guid;
}
else if (
BitArrayManipulation.CompareByteArray(magic, magic.Length, MagicStartOfFile,
MagicStartOfFile.Length) != 0)
{
_fileInfos.TryAdd(file.Index, UnknownFile.Instance);
continue;
}
var fileType = (KVFileType)reader.ReadUInt8();
IFileInfo fileInfo;
switch (fileType)
{
case KVFileType.TransactionLog:
fileInfo = new FileTransactionLog(ref reader, guid);
break;
case KVFileType.KeyIndex:
fileInfo = new FileKeyIndex(ref reader, guid, false, false, false);
break;
case KVFileType.KeyIndexWithCommitUlong:
fileInfo = new FileKeyIndex(ref reader, guid, true, false, false);
break;
case KVFileType.ModernKeyIndex:
fileInfo = new FileKeyIndex(ref reader, guid, true, true, false);
break;
case KVFileType.ModernKeyIndexWithUlongs:
fileInfo = new FileKeyIndex(ref reader, guid, true, true, true);
break;
case KVFileType.PureValues:
fileInfo = new FilePureValues(ref reader, guid);
break;
case KVFileType.PureValuesWithId:
fileInfo = new FilePureValuesWithId(ref reader, guid);
break;
case KVFileType.HashKeyIndex:
fileInfo = new HashKeyIndex(ref reader, guid);
break;
default:
fileInfo = UnknownFile.Instance;
break;
}
if (_fileGeneration < fileInfo.Generation)
{
_fileGeneration = fileInfo.Generation;
}
_fileInfos.TryAdd(file.Index, fileInfo);
}
catch (Exception)
{
_fileInfos.TryAdd(file.Index, UnknownFile.Instance);
}
}
if (!Guid.HasValue)
{
Guid = System.Guid.NewGuid();
}
}
