public void Read_ResizeBuffer()
{
using (SerialPort com1 = TCSupport.InitFirstSerialPort())
using (SerialPort com2 = TCSupport.InitSecondSerialPort(com1))
{
char[] charXmitBuffer = TCSupport.GetRandomChars(1023, TCSupport.CharacterOptions.ASCII);
int readResult;
Debug.WriteLine("Verifying that Read(char[], int, int) will compact data in the buffer");
com1.Encoding = Encoding.ASCII;
com2.Encoding = Encoding.ASCII;
com1.Open();
if (!com2.IsOpen) //This is necessary since com1 and com2 might be the same port if we are using a loopback
{
com2.Open();
}
//[] Fill the buffer up then read in all but one of the chars
var expectedChars = new char[charXmitBuffer.Length - 1];
var charRcvBuffer = new char[charXmitBuffer.Length - 1];
Array.Copy(charXmitBuffer, expectedChars, charXmitBuffer.Length - 1);
com2.Write(charXmitBuffer, 0, charXmitBuffer.Length);
TCSupport.WaitForPredicate(() => com1.BytesToRead == charXmitBuffer.Length, 2000,
"Err_29829haie Expected to received {0} bytes actual={1}", charXmitBuffer.Length, com1.BytesToRead);
if (charXmitBuffer.Length - 1 != (readResult = com1.Read(charRcvBuffer, 0, charXmitBuffer.Length - 1)))
{
Fail("Err_55084aheid Expected to read {0} chars actual {1}", charXmitBuffer.Length - 1,
readResult);
}
TCSupport.VerifyArray(expectedChars, charRcvBuffer);
//[] Write 16 more cahrs and read in 16 chars
expectedChars = new char[16];
charRcvBuffer = new char[16];
expectedChars[0] = charXmitBuffer[charXmitBuffer.Length - 1];
Array.Copy(charXmitBuffer, 0, expectedChars, 1, 15);
com2.Write(charXmitBuffer, 0, 16);
TCSupport.WaitForPredicate(() => com1.BytesToRead == 17, 2000,
"Err_0516848aied Expected to received {0} bytes actual={1}", 17, com1.BytesToRead);
if (16 != (readResult = com1.Read(charRcvBuffer, 0, 16)))
{
Fail("Err_650848ahide Expected to read {0} chars actual {1}", 16, readResult);
}
Assert.Equal(expectedChars, charRcvBuffer);
//[] Write more chars and read in all of the chars
expectedChars = new char[charXmitBuffer.Length + 1];
charRcvBuffer = new char[charXmitBuffer.Length + 1];
expectedChars[0] = charXmitBuffer[15];
Array.Copy(charXmitBuffer, 0, expectedChars, 1, charXmitBuffer.Length);
com2.Write(charXmitBuffer, 0, charXmitBuffer.Length);
TCSupport.WaitForPredicate(() => com1.BytesToRead == charXmitBuffer.Length + 1, 2000,
"Err_41515684 Expected to received {0} bytes actual={1}", charXmitBuffer.Length + 2, com1.BytesToRead);
if (charXmitBuffer.Length + 1 != (readResult = com1.Read(charRcvBuffer, 0, charXmitBuffer.Length + 1)))
{
Fail("Err_460574ajied Expected to read {0} chars actual {1}", charXmitBuffer.Length + 1, readResult);
}
Assert.Equal(expectedChars, charRcvBuffer);
}
}
