public void ReadByte_FileWithData_ReturnFirstByte()
{
// Arrange
const int expectedResult = 0x31;
IInputStream fileInputStream = new FileInputStream($"{TestFilesPath}/FileWithData.txt");
// Act
int result = fileInputStream.ReadByte();
fileInputStream.Dispose();
// Assert
Assert.Equal(expectedResult, result);
}
public void ReadByte_FileIsEmpty_ReturnEndOfStreamIntCode()
{
// Arrange
const int endOfFileCode = -1;
IInputStream fileInputStream = new FileInputStream($"{TestFilesPath}/EmptyFile.txt");
// Act
int result = fileInputStream.ReadByte();
fileInputStream.Dispose();
// Assert
Assert.Equal(endOfFileCode, result);
}
// Processor wants to read data or status:
public override byte Read()
{
byte b;
Int32 Byte;
if ((Address & 0x0001) == 0x0001)
{
// Read received data:
switch (mode)
{
case IO_MODE_6820_TAPE:
timer.Start();
ResetFlag(ACIA_STATUS_RDRF);
if (line < Lines.Length)
{
if (pos > Lines[line].Length - 1)
{
if (Lines[line] == "RUN")
{
// Special treatment.
// People use to put "RUN" at end of listing in order to run the app,
// folloed by on last line containing only one space.
// The manual states procedure to use if "RUN" and pace is not inlcuded
// in listing only, and the user is told to get back to normal (not load)
// mode by pressing space and then enter.
// However, this does not work here, so if a "RUN" line is encountered
// we must tell keyboard input routine to reset the load:
mainPage.CSignetic6502.MemoryBus.Keyboard.loadResetIsNeeded = true;
}
line++;
pos = 0;
GC.Collect();
return(0x0d);
}
else
{
b = (byte)Lines[line][pos++];
return(b);
}
}
return(0x00);
case IO_MODE_6820_MIDI:
// If this is the last byte received for now, set flag to indicate 'no data available':
if ((byte)(outpointer + 1) == inpointer)
{
ResetFlag(ACIA_STATUS_RDRF);
}
return(midiBuffer[outpointer++]);
case IO_MODE_6820_SERIAL:
if (inStream != null)
{
Byte = inStream.ReadByte();
if (Byte > -1)
{
return((byte)Byte);
}
else
{
inStream.Close();
inStream = null;
}
}
return(0x00);
case IO_MODE_6820_FILE:
//while (CharNumber >= CurrentFile[LineNumber].Length)
//{
// CharNumber = 0;
// LineNumber++;
//}
//if (LineNumber < CurrentFile.Length)
//{
// if (CurrentFile[LineNumber][CharNumber++] != 0x0a)
// {
// return (byte)CurrentFile[LineNumber][CharNumber];
// }
//}
if (FileInputStream != null)
{
Byte = FileInputStream.ReadByte();
// BASIC uses only 0d for line feeds, remove 0a:
if (Byte == 10)
{
Byte = FileInputStream.ReadByte();
}
if (Byte > -1)
{
return((byte)Byte);
}
else
{
FileInputStream.Close();
FileInputStream = null;
}
}
return(0xff);
default:
return(0xff);
}
}
else
{
// Read status:
switch (mode)
{
case IO_MODE_6820_TAPE:
if (line < Lines.Length)
{
return(ACIAStatus);
}
else
{
return(0);
}
case IO_MODE_6820_MIDI:
if ((ACIAStatus & ACIA_STATUS_TDRE) == ACIA_STATUS_TDRE)
{
SetFlag(ACIA_STATUS_TDRE);
return(ACIAStatus);
}
else
{
return(ACIAStatus);
}
case IO_MODE_6820_FILE:
return(ACIAStatus);
case IO_MODE_6820_SERIAL:
SetFlag(ACIA_STATUS_TDRE);
SetFlag(ACIA_STATUS_RDRF);
return(ACIAStatus);
default:
return(0);
}
}
}