private static Stream AddVersion(Stream stream, int version)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
var versionStream = new BufferStream(_bufferManager);
VintUtils.SetUInt64(versionStream, (uint)version);
return(new UniteStream(versionStream, stream));
}
private static Stream AddPadding(Stream stream, int size)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
try
{
var lengthStream = new BufferStream(_bufferManager);
VintUtils.SetUInt64(lengthStream, (ulong)stream.Length);
Stream paddingStream;
{
using (var random = RandomNumberGenerator.Create())
{
int paddingLength = size - (int)(lengthStream.Length + stream.Length);
paddingStream = new BufferStream(_bufferManager);
using (var safeBuffer = _bufferManager.CreateSafeBuffer(1024 * 4))
{
while (paddingLength > 0)
{
int writeSize = Math.Min(paddingLength, safeBuffer.Value.Length);
random.GetBytes(safeBuffer.Value);
paddingStream.Write(safeBuffer.Value, 0, writeSize);
paddingLength -= writeSize;
}
}
}
}
return(new UniteStream(lengthStream, stream, paddingStream));
}
catch (Exception e)
{
if (stream != null)
{
stream.Dispose();
}
throw new ArgumentException(e.Message, e);
}
}
private static Stream AddHash(Stream stream)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
var hashStream = new BufferStream(_bufferManager);
{
VintUtils.SetUInt64(hashStream, (uint)ConvertHashAlgorithm.Sha256);
var value = Sha256.ComputeHash(new WrapperStream(stream, true));
hashStream.Write(value, 0, value.Length);
}
return(new UniteStream(hashStream, stream));
}
private static Stream ToStream <T>(int version, ItemBase <T> item)
where T : ItemBase <T>
{
Stream stream = null;
try
{
stream = new RangeStream(item.Export(_bufferManager));
var dic = new Dictionary <byte, Stream>();
try
{
stream.Seek(0, SeekOrigin.Begin);
BufferStream deflateBufferStream = null;
try
{
deflateBufferStream = new BufferStream(_bufferManager);
using (var deflateStream = new DeflateStream(deflateBufferStream, CompressionMode.Compress, true))
using (var safeBuffer = _bufferManager.CreateSafeBuffer(1024 * 4))
{
int length;
while ((length = stream.Read(safeBuffer.Value, 0, safeBuffer.Value.Length)) > 0)
{
deflateStream.Write(safeBuffer.Value, 0, length);
}
}
deflateBufferStream.Seek(0, SeekOrigin.Begin);
dic.Add((byte)ConvertCompressionAlgorithm.Deflate, deflateBufferStream);
}
catch (Exception)
{
if (deflateBufferStream != null)
{
deflateBufferStream.Dispose();
}
}
}
catch (Exception)
{
}
dic.Add((byte)ConvertCompressionAlgorithm.None, stream);
var list = dic.ToList();
list.Sort((x, y) =>
{
int c = x.Value.Length.CompareTo(y.Value.Length);
if (c != 0)
{
return(c);
}
return(x.Key.CompareTo(y.Key));
});
for (int i = 1; i < list.Count; i++)
{
list[i].Value.Dispose();
}
var headerStream = new BufferStream(_bufferManager);
VintUtils.SetUInt64(headerStream, (uint)version);
VintUtils.SetUInt64(headerStream, list[0].Key);
var dataStream = new UniteStream(headerStream, list[0].Value);
var crcStream = new MemoryStream(Crc32_Castagnoli.ComputeHash(new WrapperStream(dataStream, true)));
return(new UniteStream(dataStream, crcStream));
}
catch (Exception ex)
{
if (stream != null)
{
stream.Dispose();
}
throw new ArgumentException(ex.Message, ex);
}
}
private static Stream Compress(Stream stream)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
try
{
var dic = new Dictionary <byte, Stream>();
try
{
stream.Seek(0, SeekOrigin.Begin);
BufferStream deflateBufferStream = null;
try
{
deflateBufferStream = new BufferStream(_bufferManager);
using (var deflateStream = new DeflateStream(deflateBufferStream, CompressionMode.Compress, true))
using (var safeBuffer = _bufferManager.CreateSafeBuffer(1024 * 4))
{
int length;
while ((length = stream.Read(safeBuffer.Value, 0, safeBuffer.Value.Length)) > 0)
{
deflateStream.Write(safeBuffer.Value, 0, length);
}
}
deflateBufferStream.Seek(0, SeekOrigin.Begin);
dic.Add((byte)ConvertCompressionAlgorithm.Deflate, deflateBufferStream);
}
catch (Exception)
{
if (deflateBufferStream != null)
{
deflateBufferStream.Dispose();
}
}
}
catch (Exception)
{
}
dic.Add((byte)ConvertCompressionAlgorithm.None, stream);
var list = dic.ToList();
list.Sort((x, y) =>
{
int c = x.Value.Length.CompareTo(y.Value.Length);
if (c != 0)
{
return(c);
}
return(x.Key.CompareTo(y.Key));
});
for (int i = 1; i < list.Count; i++)
{
list[i].Value.Dispose();
}
var headerStream = new BufferStream(_bufferManager);
VintUtils.SetUInt64(headerStream, list[0].Key);
return(new UniteStream(headerStream, list[0].Value));
}
catch (Exception ex)
{
if (stream != null)
{
stream.Dispose();
}
throw new ArgumentException(ex.Message, ex);
}
}
private static Stream Encrypt(Stream stream, ExchangePublicKey publicKey)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
if (publicKey == null)
{
throw new ArgumentNullException(nameof(publicKey));
}
try
{
BufferStream outStream = null;
try
{
outStream = new BufferStream(_bufferManager);
VintUtils.SetUInt64(outStream, (uint)ConvertCryptoAlgorithm.Aes256);
var cryptoKey = new byte[32];
var iv = new byte[32];
using (var random = RandomNumberGenerator.Create())
{
random.GetBytes(cryptoKey);
random.GetBytes(iv);
}
{
var encryptedBuffer = Exchange.Encrypt(publicKey, cryptoKey);
VintUtils.SetUInt64(outStream, (uint)encryptedBuffer.Length);
outStream.Write(encryptedBuffer, 0, encryptedBuffer.Length);
}
outStream.Write(iv, 0, iv.Length);
using (var aes = Aes.Create())
{
aes.KeySize = 256;
aes.Mode = CipherMode.CBC;
aes.Padding = PaddingMode.PKCS7;
using (var inStream = new WrapperStream(stream, true))
using (var cs = new CryptoStream(inStream, aes.CreateEncryptor(cryptoKey, iv), CryptoStreamMode.Read))
using (var safeBuffer = _bufferManager.CreateSafeBuffer(1024 * 4))
{
int length;
while ((length = cs.Read(safeBuffer.Value, 0, safeBuffer.Value.Length)) > 0)
{
outStream.Write(safeBuffer.Value, 0, length);
}
}
}
outStream.Seek(0, SeekOrigin.Begin);
}
catch (Exception)
{
if (outStream != null)
{
outStream.Dispose();
}
throw;
}
return(outStream);
}
catch (Exception e)
{
throw new ArgumentException(e.Message, e);
}
finally
{
if (stream != null)
{
stream.Dispose();
}
}
}