public override void Write(byte[] buffer, int offset, int count)
{
mLength += count;
for (int i = 0; i < count; i++)
{
mBytes[buffer[offset + i]]++;
}
mCurrentCRC = CRC.Update(mCurrentCRC, buffer, offset, count);
}
public uint Finish()
{
if (!mFinished)
{
mFinished = true;
mCRC = CRC.Finish(mCRC);
}
return(mCRC);
}
public override void Write(byte[] buffer, int offset, int count)
{
if (mFinished)
{
throw new InvalidOperationException("CRC calculation has been finished.");
}
mProcessed += count;
mCRC = CRC.Update(mCRC, buffer, offset, count);
mTarget.Write(buffer, offset, count);
}
public override int Read(byte[] buffer, int offset, int count)
{
if (count > 0 && !mFinished)
{
int read = mSource.Read(buffer, offset, count);
if (read > 0)
{
mProcessed += read;
mCRC = CRC.Update(mCRC, buffer, offset, read);
return(read);
}
Finish();
}
return(0);
}
protected override void Dispose(bool disposing)
{
try
{
if (disposing && !mClosed)
{
mClosed = true;
mCurrentCRC = CRC.Finish(mCurrentCRC);
#if DEBUG
if (mCurrentCRC == mExpectedCRC)
{
System.Diagnostics.Debug.WriteLine("CRC ok: " + mExpectedCRC.ToString("x8"));
}
else
{
System.Diagnostics.Debugger.Break();
System.Diagnostics.Debug.WriteLine("bad CRC");
}
double lengthInv = 1.0 / mLength;
double entropy = 0;
for (int i = 0; i < 256; i++)
{
if (mBytes[i] != 0)
{
double p = lengthInv * mBytes[i];
entropy -= p * Math.Log(p, 256);
}
}
System.Diagnostics.Debug.WriteLine("entropy: " + (int)(entropy * 100) + "%");
#endif
}
}
finally
{
base.Dispose(disposing);
}
}
