public Chunker(Stream stream, HasherType type, uint significantHashBits)
{
//significantBitsMask = (uint)Math.Pow(2, significantHashBits);
for (var i = 0; i < significantHashBits; i++)
{
significantBitsMask = (uint)((significantBitsMask << 1) + 1);
}
copyingStream = new CopyingStream(stream);
this.hasher = AbstractRollingHasher.createInstance(type, copyingStream, WINDOW_SIZE);
}
public StreamWriter OpenFileToWrite(string filename)
{
var stream = new CopyingStream(value => files[filename] = value);
return(new StreamWriter(stream));
}
/// <summary>
/// Reads a generic value from the stream
/// </summary>
/// <param name="tag">The tag number of the wrapping tags, or 255 for no wrapping tag</param>
/// <returns>The read value</returns>
public GenericValue ReadGeneric(byte tag = 255)
{
CopyingStream cstream = new CopyingStream(_stream);
BinaryReader creader = new BinaryReader(cstream);
Stream ostream = _stream;
BinaryReader oreader = _reader;
long end = 0;
int depth = 0;
ReadOpenTag(tag);
if (_hasHeader)
throw new Exception("Can't read generic tag when header is already cached");
try
{
_stream = cstream;
_reader = creader;
while (depth >= 0)
{
end = cstream.Position;
_peekHeader();
// TODO: EOF handling
if (_lvt == LVT.Type)
{
if (depth == 0 && _type == TagType.Close && _tagNumber == tag)
break;
else if (_type == TagType.Open)
depth++;
else if (_type == TagType.Close)
depth--;
}
else if (_lvt == LVT.Length)
{
cstream.Skip(_length);
}
_hasHeader = false;
}
}
finally
{
_stream = ostream;
_reader = oreader;
}
ReadCloseTag(tag);
return new TaggedGenericValue(cstream.MemoryStream.GetBuffer(), 0, (int)end);
}
/// <summary>
/// Reads a generic value from the stream
/// </summary>
/// <param name="tag">The tag number of the wrapping tags, or 255 for no wrapping tag</param>
/// <returns>The read value</returns>
public GenericValue ReadGeneric(byte tag = 255)
{
CopyingStream cstream = new CopyingStream(_stream);
BinaryReader creader = new BinaryReader(cstream);
Stream ostream = _stream;
BinaryReader oreader = _reader;
long end = 0;
int depth = 0;
ReadOpenTag(tag);
if (_hasHeader)
{
throw new Exception("Can't read generic tag when header is already cached");
}
try
{
_stream = cstream;
_reader = creader;
while (depth >= 0)
{
end = cstream.Position;
_peekHeader();
// TODO: EOF handling
if (_lvt == LVT.Type)
{
if (depth == 0 && _type == TagType.Close && _tagNumber == tag)
{
break;
}
else if (_type == TagType.Open)
{
depth++;
}
else if (_type == TagType.Close)
{
depth--;
}
}
else if (_lvt == LVT.Length)
{
cstream.Skip(_length);
}
_hasHeader = false;
}
}
finally
{
_stream = ostream;
_reader = oreader;
}
ReadCloseTag(tag);
return(new TaggedGenericValue(cstream.MemoryStream.GetBuffer(), 0, (int)end));
}
