public bool ValidateChecksum(IChecksumAlgorithm algorithm)
{
var recieved = RemoveLastBytes(algorithm.ChecksumSize);
var computed = algorithm.ComputeChecksum(Content);
return(recieved.SequenceEqual(computed));
}
public Message ComputeChecksum(IChecksumAlgorithm algorithm)
{
var checksum = algorithm.ComputeChecksum(Content);
AddBytes(checksum);
return(this);
}
internal CompressedStream(
Stream baseStream,
StreamOperationMode mode,
ICompressionAlgorithm compressionAlgorithm,
IChecksumAlgorithm checksumAlgorithm)
: base(baseStream, mode)
{
if (compressionAlgorithm == null)
{
throw new ArgumentNullException(nameof(compressionAlgorithm));
}
this.Initialize(baseStream, compressionAlgorithm, checksumAlgorithm);
}
public CompressedStream(
Stream baseStream,
StreamOperationMode mode,
CompressionSettings settings,
bool useCrc32,
EncryptionSettings encryptionSettings)
: base(baseStream, mode)
{
baseStream = encryptionSettings != null ? (Stream) new CryptoStream(baseStream, mode, PlatformSettings.Manager.GetCryptoProvider(encryptionSettings)) : baseStream;
ICompressionAlgorithm compressionAlgorithm = ZipHelper.GetCompressionAlgorithm(settings);
IChecksumAlgorithm checksumAlgorithm = useCrc32 ? (IChecksumAlgorithm) new Crc32() : (IChecksumAlgorithm) new Adler32();
this.Initialize(baseStream, compressionAlgorithm, checksumAlgorithm);
}
private void Initialize(
Stream baseStream,
ICompressionAlgorithm compressionAlgorithm,
IChecksumAlgorithm checksumAlgorithm)
{
this.BaseStream = baseStream;
this.algorithm = compressionAlgorithm;
this.ChecksumAlgorithm = checksumAlgorithm;
switch (this.Mode)
{
case StreamOperationMode.Read:
this.Transform = this.algorithm.CreateDecompressor();
break;
case StreamOperationMode.Write:
this.Transform = this.algorithm.CreateCompressor();
break;
}
}