public static byte[] ComputeHash(ArraySegment <byte> value)
{
if (value.Array == null)
{
throw new ArgumentNullException("value");
}
return(Crc32_Castagnoli.ComputeHash(value.Array, value.Offset, value.Count));
}
public static byte[] ComputeHash(string value)
{
if (value == null)
{
throw new ArgumentNullException("value");
}
return(Crc32_Castagnoli.ComputeHash(_threadLocalEncoding.Value.GetBytes(value)));
}
/// <summary>
/// ハッシュを生成する
/// </summary>
/// <param name="buffer">ハッシュ値を計算するbyte配列</param>
public static byte[] ComputeHash(byte[] buffer)
{
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
return(Crc32_Castagnoli.ComputeHash(buffer, 0, buffer.Length));
}
public static int GetHashCode(byte[] buffer)
{
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
return(BitConverter.ToInt32(Crc32_Castagnoli.ComputeHash(
new ArraySegment <byte>[]
{
new ArraySegment <byte>(_vector),
new ArraySegment <byte>(buffer),
}), 0));
}
private static Stream ToStream <T>(ItemBase <T> item)
where T : ItemBase <T>
{
Stream stream = null;
try
{
stream = new RangeStream(item.Export(_bufferManager));
List <KeyValuePair <byte, Stream> > list = new List <KeyValuePair <byte, Stream> >();
try
{
stream.Seek(0, SeekOrigin.Begin);
BufferStream deflateBufferStream = null;
try
{
deflateBufferStream = new BufferStream(_bufferManager);
using (DeflateStream deflateStream = new DeflateStream(deflateBufferStream, CompressionMode.Compress, true))
{
byte[] compressBuffer = null;
try
{
compressBuffer = _bufferManager.TakeBuffer(1024 * 4);
int i = -1;
while ((i = stream.Read(compressBuffer, 0, compressBuffer.Length)) > 0)
{
deflateStream.Write(compressBuffer, 0, i);
}
}
finally
{
if (compressBuffer != null)
{
_bufferManager.ReturnBuffer(compressBuffer);
}
}
}
deflateBufferStream.Seek(0, SeekOrigin.Begin);
list.Add(new KeyValuePair <byte, Stream>((byte)ConvertCompressionAlgorithm.Deflate, deflateBufferStream));
}
catch (Exception)
{
if (deflateBufferStream != null)
{
deflateBufferStream.Dispose();
}
}
}
catch (Exception)
{
}
list.Add(new KeyValuePair <byte, Stream>((byte)ConvertCompressionAlgorithm.None, stream));
list.Sort((x, y) =>
{
int c = x.Value.Length.CompareTo(y.Value.Length);
if (c != 0)
{
return(c);
}
return(x.Key.CompareTo(y.Key));
});
#if DEBUG
if (list[0].Value.Length != stream.Length)
{
Debug.WriteLine("Library.Security.Converter ToStream : {0}→{1} {2}",
NetworkConverter.ToSizeString(stream.Length),
NetworkConverter.ToSizeString(list[0].Value.Length),
NetworkConverter.ToSizeString(list[0].Value.Length - stream.Length));
}
#endif
for (int i = 1; i < list.Count; i++)
{
list[i].Value.Dispose();
}
BufferStream headerStream = new BufferStream(_bufferManager);
headerStream.WriteByte((byte)list[0].Key);
var dataStream = new UniteStream(headerStream, list[0].Value);
MemoryStream crcStream = new MemoryStream(Crc32_Castagnoli.ComputeHash(dataStream));
return(new UniteStream(dataStream, crcStream));
}
catch (Exception ex)
{
if (stream != null)
{
stream.Dispose();
}
throw new ArgumentException(ex.Message, ex);
}
}
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("Library.Security.Converter 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);
}
}