private void EnsureCapacity(int capacity)
{
if (capacity > MaxLength)
{
throw new ArgumentOutOfRangeException(nameof(capacity), SR.ArgumentOutOfRange_Capacity);
}
Debug.Assert(_buffer != null);
if ((uint)capacity * sizeof(char) <= _buffer.ByteLength)
{
return;
}
UnmanagedBuffer oldBuffer = _buffer;
UnmanagedBuffer newBuffer = UnmanagedBuffer.Allocate(GetAlignedByteSize(capacity));
UnmanagedBuffer.Copy(oldBuffer, newBuffer, (uint)_decryptedLength * sizeof(char));
_buffer = newBuffer;
oldBuffer.Dispose();
}
private bool DoTestExternalRam()
{
var result = true;
if (this.startSdRamTest)
{
return(false);
}
this.startSdRamTest = true;
new Thread(this.ThreadBlinkLed).Start();
var externalRam1 = new UnmanagedBuffer(16 * 1024 * 1024);
var externalRam2 = new UnmanagedBuffer(14 * 1024 * 1024);
byte[] buf1 = null;
byte[] buf2 = null;
var useUnmanagedHeap = false;
if (GHIElectronics.TinyCLR.Native.Memory.UnmanagedMemory.FreeBytes == 0 &&
GHIElectronics.TinyCLR.Native.Memory.ManagedMemory.FreeBytes > 512 * 1024)
{
buf1 = new byte[16 * 1024 * 1024];
buf2 = new byte[14 * 1024 * 1024];
}
else
{
buf1 = externalRam1.Bytes;
buf2 = externalRam2.Bytes;
useUnmanagedHeap = true;
}
var md5 = GHIElectronics.TinyCLR.Cryptography.MD5.Create();
var hashValue = md5.ComputeHash(buf1); //data is a byte array.
var rd = new Random(3);
this.UpdateStatusText("Testing external ram. It will take ~ 2 seconds to get test result.", true, System.Drawing.Color.White);
this.UpdateStatusText(" ", false);
this.UpdateStatusText("External ram test is starting...", false);
this.UpdateStatusText(" ", false);
this.UpdateStatusText("Ram test is failed if the led stops blinking ", false);
this.UpdateStatusText("(or the test stop at this step more than 2 seconds) ", false);
Thread.Sleep(100);
rd.NextBytes(buf2);
try {
var hashValue2 = md5.ComputeHash(buf1); //data is a byte array.
for (var i = 0; i < hashValue.Length; i++)
{
if (hashValue[i] != hashValue2[i])
{
result = false;
}
}
}
catch {
result = false;
}
if (useUnmanagedHeap)
{
externalRam1.Dispose();
externalRam2.Dispose();
}
if (result)
{
this.UpdateStatusText("Test external ram passed.", false);
}
else
{
this.UpdateStatusText("Test external ram failed.", false, System.Drawing.Color.Red);
}
this.startSdRamTest = false;
return(result);
}
public void Dispose()
{
_buffer.Dispose();
}