public async Task ReadData(string path, byte[] keystream, byte keyrepeat, IProgress <int> sizeReport, IProgress <int> PerformStep, string password)
{
ExceptionEncountered = false;
try
{
listByte.Clear();
int chunk = 1024 * 1024 * 10;
byte[] chunkData = new byte[chunk];
long readChunk = 0;
bool less100mb = false;
enchipher = new EBCEA(keystream, keyrepeat);
if (size < chunk)
{
chunk = (int)size;
less100mb = true;
}
int rounds = 0;
if (size % chunk != 0)
{
rounds = (int)(size / chunk) + 1;
}
else
{
rounds = (int)size / chunk;
}
sizeReport.Report(rounds);
int i = 0;
while (readChunk != size)
{
if (!less100mb)
{
if ((size - readChunk) < (1024 * 1024 * 10))
{
chunk = (int)(size - readChunk);
chunkData = new byte[chunk];
}
}
chunkData = enchipher.encyptData(ReadChunk(path, readChunk, chunk, true), password);
i++;
PerformStep.Report(i);
readChunk += chunk;
listByte.Add(chunkData);
await Task.Delay(100);
}
}
catch (Exception ErrorMessage)
{
ExceptionEncountered = true;
MessageBox.Show(string.Format("Encountered an exception while reading file.\n\n{0}", ErrorMessage.Message), "Cuttlefish", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
public async Task writeData(string path, long size, byte[] keystream, byte keyrepeat, IProgress <long> reportWroteData, List <byte[]> data, string password)
{
ExceptionEncountered = false;
try
{
enchipher = new EBCEA(keystream, keyrepeat);
long wroteDataLenght = 0;
reportWroteData.Report(wroteDataLenght);
FileStream fs = null;
if (File.Exists(path))
{
fs = new FileStream(path, FileMode.Truncate, FileAccess.Write);
}
else
{
fs = new FileStream(path, FileMode.Create, FileAccess.Write);
}
using (fs)
{
for (int i = 0; i < data.Count; i++)
{
byte[] temp = decryptDataStream(data[i], password);
if ((size - wroteDataLenght) < temp.Length)
{
fs.Write(temp, 0, (int)(size - wroteDataLenght));
wroteDataLenght += (size - wroteDataLenght);
reportWroteData.Report(wroteDataLenght);
}
else
{
fs.Write(temp, 0, temp.Length);
wroteDataLenght += temp.Length;
reportWroteData.Report(wroteDataLenght);
}
await Task.Delay(100);
}
}
fs.Dispose();
}
catch (Exception ErrorMessage)
{
ExceptionEncountered = true;
MessageBox.Show(string.Format("Opps, file access denied. Please check if file is in use by another program \n{0}", ErrorMessage.Message), "Cuttlefish", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}