public void Read(Stream data)
{
if (data == null)
{
throw new ArgumentNullException(nameof(data));
}
var reader = new UnityReader(data);
Header = new DatabaseHeader(reader);
byte[] buffer = reader.ReadBytes(Header.CompressedSize);
byte[] uncompressed = LZ4Codec.Decode(buffer, 0, buffer.Length, Header.UncompressedSize);
using (var ms = new MemoryStream(uncompressed))
{
UnityReader lz4Reader = new UnityReader(ms);
int classCount = lz4Reader.ReadInt32();
Classes = new TypeClass[classCount];
for (int i = 0; i < classCount; i++)
{
Classes[i] = new TypeClass(lz4Reader, this);
}
lz4Reader.Position = Header.StringTablePosition;
_stringTable = lz4Reader.ReadStringFixed(Header.StringTableLength, Encoding.ASCII);
}
}
public void WriteAndReadHeader()
{
using MemoryFileSystemService service = new MemoryFileSystemService(new DatatentSettings(), Constants.DATABASE_HEADER_SIZE * 5, new NullLogger <FileSystemServiceBase>());
DatabaseHeader expected = new DatabaseHeader(1, new DataProcessingInformations(Guid.NewGuid(), Guid.NewGuid()));
service.WriteDatabaseHeader(ref expected);
DatabaseHeader result = service.ReadDatabaseHeader();
result.Identifier.Should().Be(result.Identifier);
result.Version.Should().Be(result.Version);
result.DataProcessingInformations.CompressionServiceId.Should().NotBeEmpty();
}
private void Initialize()
{
Header = DatabaseHeader.Parse(_reader);
// Database Size in pages adjustment
// https://www.sqlite.org/fileformat.html#in_header_database_size
uint expectedPages = (uint)(_reader.Length / Header.PageSize);
// TODO: Warn on mismatch
_sizeInPages = Math.Max(expectedPages, Header.DatabaseSizeInPages);
_reader.ApplySqliteDatabaseHeader(Header);
}
internal void ApplySqliteDatabaseHeader(DatabaseHeader header)
{
PageSize = header.PageSize;
ReservedSpace = header.ReservedSpaceAtEndOfPage;
TextEncoding = header.TextEncoding;
switch (TextEncoding)
{
case SqliteEncoding.UTF8:
_encoding = Encoding.UTF8;
break;
case SqliteEncoding.UTF16LE:
_encoding = Encoding.Unicode;
break;
case SqliteEncoding.UTF16BE:
_encoding = Encoding.BigEndianUnicode;
break;
default:
throw new ArgumentOutOfRangeException();
}
}
private void InitNew()
{
var header = new DatabaseHeader(Constants.VERSION, _processingPipeline.GetInformations());
_fileSystemService.WriteDatabaseHeader(ref header);
}
