public void seek()
{
MemoryStream memStream = new MemoryStream(testData, false);
memStream.Seek(testDataOffset, SeekOrigin.Current);
RangeStream rangeStream = new RangeStream(memStream, testDataLength);
Assert.AreEqual(testData[testDataOffset + 0], rangeStream.ReadByte());
rangeStream.Position += 2;
Assert.AreEqual(testData[testDataOffset + 3], rangeStream.ReadByte());
Assert.AreEqual(0, rangeStream.Seek(0, SeekOrigin.Begin));
Assert.AreEqual(testData[testDataOffset + 0], rangeStream.ReadByte());
Assert.AreEqual(2, rangeStream.Seek(1, SeekOrigin.Current));
Assert.AreEqual(testData[testDataOffset + 2], rangeStream.ReadByte());
Assert.AreEqual(1, rangeStream.Seek(-3, SeekOrigin.End));
Assert.AreEqual(testData[testDataOffset + 1], rangeStream.ReadByte());
}
private static T FromStream <T>(Stream stream)
where T : ItemBase <T>
{
try
{
using (var targetStream = new RangeStream(stream, true))
{
using (Stream verifyStream = new RangeStream(targetStream, 0, targetStream.Length - 4, true))
{
byte[] verifyCrc = Crc32_Castagnoli.ComputeHash(verifyStream);
byte[] orignalCrc = new byte[4];
using (RangeStream crcStream = new RangeStream(targetStream, targetStream.Length - 4, 4, true))
{
crcStream.Read(orignalCrc, 0, orignalCrc.Length);
}
if (!Unsafe.Equals(verifyCrc, orignalCrc))
{
throw new ArgumentException("Crc Error");
}
}
targetStream.Seek(0, SeekOrigin.Begin);
byte type = (byte)targetStream.ReadByte();
using (Stream dataStream = new RangeStream(targetStream, targetStream.Position, targetStream.Length - targetStream.Position - 4, true))
{
if (type == (byte)ConvertCompressionAlgorithm.None)
{
return(ItemBase <T> .Import(dataStream, _bufferManager));
}
else if (type == (byte)ConvertCompressionAlgorithm.Deflate)
{
using (BufferStream deflateBufferStream = new BufferStream(_bufferManager))
{
byte[] decompressBuffer = null;
try
{
decompressBuffer = _bufferManager.TakeBuffer(1024 * 4);
using (DeflateStream deflateStream = new DeflateStream(dataStream, CompressionMode.Decompress, true))
{
int i = -1;
while ((i = deflateStream.Read(decompressBuffer, 0, decompressBuffer.Length)) > 0)
{
deflateBufferStream.Write(decompressBuffer, 0, i);
}
}
}
finally
{
if (decompressBuffer != null)
{
_bufferManager.ReturnBuffer(decompressBuffer);
}
}
#if DEBUG
Debug.WriteLine("AmoebaConverter FromStream : {0}→{1} {2}",
NetworkConverter.ToSizeString(dataStream.Length),
NetworkConverter.ToSizeString(deflateBufferStream.Length),
NetworkConverter.ToSizeString(dataStream.Length - deflateBufferStream.Length));
#endif
deflateBufferStream.Seek(0, SeekOrigin.Begin);
return(ItemBase <T> .Import(deflateBufferStream, _bufferManager));
}
}
else
{
throw new ArgumentException("ArgumentException");
}
}
}
}
catch (Exception e)
{
throw new ArgumentException(e.Message, e);
}
}
private static Stream Decompress(Stream stream)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
try
{
var targetStream = new RangeStream(stream, true);
byte type = (byte)targetStream.ReadByte();
if (type == (byte)ConvertCompressionAlgorithm.None)
{
return(new RangeStream(targetStream));
}
else if (type == (byte)ConvertCompressionAlgorithm.Deflate)
{
using (Stream dataStream = new WrapperStream(targetStream, true))
{
BufferStream deflateBufferStream = null;
try
{
deflateBufferStream = new BufferStream(_bufferManager);
using (DeflateStream deflateStream = new DeflateStream(dataStream, CompressionMode.Decompress, true))
{
byte[] decompressBuffer = null;
try
{
decompressBuffer = _bufferManager.TakeBuffer(1024 * 4);
int i = -1;
while ((i = deflateStream.Read(decompressBuffer, 0, decompressBuffer.Length)) > 0)
{
deflateBufferStream.Write(decompressBuffer, 0, i);
}
}
finally
{
if (decompressBuffer != null)
{
_bufferManager.ReturnBuffer(decompressBuffer);
}
}
}
deflateBufferStream.Seek(0, SeekOrigin.Begin);
#if DEBUG
Debug.WriteLine("ContentConverter Decompress {3} : {0}→{1} {2}",
NetworkConverter.ToSizeString(dataStream.Length),
NetworkConverter.ToSizeString(deflateBufferStream.Length),
NetworkConverter.ToSizeString(dataStream.Length - deflateBufferStream.Length),
ConvertCompressionAlgorithm.Deflate);
#endif
return(deflateBufferStream);
}
catch (Exception)
{
if (deflateBufferStream != null)
{
deflateBufferStream.Dispose();
}
}
}
}
throw new ArgumentException("ArgumentException");
}
catch (Exception e)
{
throw new ArgumentException(e.Message, e);
}
}