/// <summary>
/// The transformation function used by all derived classes
/// </summary>
/// <param name="inputFile"></param>
/// <param name="outputFile"></param>
/// <param name="transformer"></param>
protected void InternalTransformFile([NotNull] string inputFile, [NotNull] string outputFile, [NotNull] ICryptoTransform transformer)
{
FileStream outFileStream = File.Create(outputFile);
using (var cs = new CryptoStream(outFileStream, transformer, CryptoStreamMode.Write))
using (var inFile = new BinaryReader(File.OpenRead(inputFile)))
{
try
{
inFile.BaseStream.CopyTo(cs, this.BufferSize);
}
catch (ArgumentException e)
{
InternalDebug.WriteToDiagnosticsFile(e.Message);
throw;
}
}
}
/// <summary>
/// The transformation function used by all derived classes
/// </summary>
/// <param name="inputFile"></param>
/// <param name="outputFile"></param>
/// <param name="transformer"></param>
protected void TransformFile(string inputFile, string outputFile, ICryptoTransform transformer)
{
// Any cryptographic exception indicates the data is invalid or an incorrect password has been inputted
try
{
#if DEBUG
// Debug values
if (!Stopwatch.IsHighResolution)
{
throw new Exception("You don't have a high-res sysclock");
}
Console.WriteLine(_memoryConst);
Stopwatch watch = Stopwatch.StartNew();
var iterations = 0L;
var fullIterationTime = 0.0D;
var avgIterationMilliseconds = 0D;
#endif
// Creates the streams necessary for reading and writing data
FileStream outFileStream = File.Create(outputFile);
using (var cs = new CryptoStream(outFileStream, transformer, CryptoStreamMode.Write))
using (var inFile = new BinaryReader(File.OpenRead(inputFile)))
// BinaryReader is not a stream, but it's only argument is one
{
// Continuously reads the stream until it hits an EndOfStream exception
while (true)
{
#if DEBUG
double offset = watch.Elapsed.TotalMilliseconds;
#endif
// Read as many bytes as we allow into the array from the file
byte[] data = inFile.ReadBytes(_memoryConst);
// Write it through the cryptostream so it is transformed
cs.Write(data, 0, data.Length);
// Break if
if (data.Length < _memoryConst)
{
break;
}
#if DEBUG
// Debug values
double perIterationMilliseconds = watch.Elapsed.TotalMilliseconds - offset;
avgIterationMilliseconds =
(avgIterationMilliseconds * iterations + perIterationMilliseconds) /
(iterations + 1);
fullIterationTime += perIterationMilliseconds;
iterations++;
#endif
}
#if DEBUG
// Finalize and write debug values
double totalMilliseconds = watch.Elapsed.TotalMilliseconds;
double totalSeconds = totalMilliseconds / 1000;
double perIterationSeconds = avgIterationMilliseconds / 1000,
iterationMilliseconds = avgIterationMilliseconds;
string[] toWrite =
{
$"Transformation type: " + transformer.GetType(),
"Time to transform (s):" + totalSeconds,
"Time to transform (ms):" + totalMilliseconds,
"Average iteration length (s):" + perIterationSeconds.ToString("0." + new string('#', 339)),
"Average iteration length (ms):" +
iterationMilliseconds.ToString("0." + new string('#', 339)),
"Time of all iterations, combined (s):" + fullIterationTime / 1000,
"Time of all iterations, combined (ms):" + fullIterationTime,
"Iterations:" + iterations
};
InternalDebug.WriteToDiagnosticsFile(toWrite);
#endif
}
}
catch (CryptographicException) // If something went wrong, we get it here
{
SymmetricAlgorithm.Dispose();
throw;
}
}