private void TryReadingExistingFile()
{
using (var reader = OpenReader())
using (var binaryReader = new BinaryReaderWith7BitEncoding(reader))
{
var headerSignature = binaryReader.ReadBytes(16);
if (headerSignature .Length != 16 || new Guid(headerSignature) != HeaderSignatureGuid)
throw new Exceptions.InvalidFileFormatException("File signature is invalid, probably not a valid Raven storage file, or a corrupted one");
var version = binaryReader.Read7BitEncodedInt();
if (version != Version)
throw new Exceptions.InvalidFileFormatException("File signature is valid, but the version information is " +
version + ", while " + Version + " was expected");
var fileId = binaryReader.ReadBytes(16);
if(fileId.Length!=16)
throw new Exceptions.InvalidFileFormatException("File signature is valid, but the file ID has been truncated");
Id = new Guid(fileId);
var pos = reader.Length;
while (pos > 16)
{
reader.Position = pos - 16;
if (new Guid(binaryReader.ReadBytes(16)) == TransactionSignatureGuid)
{
reader.Position = pos - 24; // move to the position of the transaction itself
var txPos = binaryReader.ReadInt64();
reader.Position = txPos;
transaction = new JsonSerializer().Deserialize<StorageTransaction>(new BsonReader(reader));
return;
}
pos -= 1;
}
throw new Exceptions.InvalidFileFormatException("Could not find a valid transaction in the file");
}
}
public Tree(Stream reader, Stream writer, StartMode mode)
{
this.reader = reader;
this.writer = writer;
binaryReader = new BinaryReaderWith7BitEncoding(this.reader);
binaryWriter = new BinaryWriterWith7BitEncoding(this.writer);
root = mode == StartMode.Create
? new TreeNode(null, null, null, null, ReadNode, WriteNodeLazy)
: ReadNode(new StreamPosition(reader.Position, null));
}
public void CanEncodeUsing7BitInt64()
{
var buffer = new byte[1024];
for (long i = 0; i < 64*1024; i++)
{
var bw = new BinaryWriterWith7BitEncoding(new MemoryStream(buffer));
bw.Write7BitEncodedInt64(i);
var br = new BinaryReaderWith7BitEncoding(new MemoryStream(buffer));
Assert.Equal(i, br.Read7BitEncodedInt64());
}
}
public void CanEncodeUsing7BitInt64()
{
var buffer = new byte[1024];
for (long i = 0; i < 64 * 1024; i++)
{
var bw = new BinaryWriterWith7BitEncoding(new MemoryStream(buffer));
bw.Write7BitEncodedInt64(i);
var br = new BinaryReaderWith7BitEncoding(new MemoryStream(buffer));
Assert.Equal(i, br.Read7BitEncodedInt64());
}
}
public Queue(Stream reader, Stream writer, StartMode mode)
{
this.reader = reader;
this.writer = writer;
binaryReader = new BinaryReaderWith7BitEncoding(reader);
binaryWriter = new BinaryWriterWith7BitEncoding(writer);
if(mode == StartMode.Open)
{
currentId = binaryReader.Read7BitEncodedInt64();
var treePos = binaryReader.Read7BitEncodedInt64();
reader.Position = treePos;
}
tree = new Tree(reader, writer, mode);
}
private void TryReadingExistingFile()
{
using (var reader = OpenReader())
using (var binaryReader = new BinaryReaderWith7BitEncoding(reader))
{
var headerSignature = binaryReader.ReadBytes(16);
if (headerSignature.Length != 16 || new Guid(headerSignature) != HeaderSignatureGuid)
{
throw new Exceptions.InvalidFileFormatException("File signature is invalid, probably not a valid Raven storage file, or a corrupted one");
}
var version = binaryReader.Read7BitEncodedInt();
if (version != Version)
{
throw new Exceptions.InvalidFileFormatException("File signature is valid, but the version information is " +
version + ", while " + Version + " was expected");
}
var fileId = binaryReader.ReadBytes(16);
if (fileId.Length != 16)
{
throw new Exceptions.InvalidFileFormatException("File signature is valid, but the file ID has been truncated");
}
Id = new Guid(fileId);
var pos = reader.Length;
while (pos > 16)
{
reader.Position = pos - 16;
if (new Guid(binaryReader.ReadBytes(16)) == TransactionSignatureGuid)
{
reader.Position = pos - 24; // move to the position of the transaction itself
var txPos = binaryReader.ReadInt64();
reader.Position = txPos;
transaction = new JsonSerializer().Deserialize <StorageTransaction>(new BsonReader(reader));
return;
}
pos -= 1;
}
throw new Exceptions.InvalidFileFormatException("Could not find a valid transaction in the file");
}
}
