public HappyPenguinVMProgram ReadCodeFromStream(Stream inputStream)
{
var inputStreamReader = new BinaryReader(inputStream);
//var inputData = inputStreamReader.ReadToEnd();
//Verify header
byte[] headerBuffer = new byte[MagicHeader.Length];
headerBuffer = inputStreamReader.ReadBytes(headerBuffer.Length);
var headerMatch = MagicHeader.SequenceEqual(headerBuffer);
if (!headerMatch)
{
throw new InvalidProgramException("The data does not contain a valid HappyPenguinVM program!");
}
//Header matches, now read instructions into code
var readProgram = new HappyPenguinVMProgram();
byte[] instructionReaderBuffer = new byte[sizeof(byte) + sizeof(int) * 2]; //Size of the instruction (byte + int + int)
while (inputStreamReader.BaseStream.Position < inputStreamReader.BaseStream.Length)
{
inputStreamReader.Read(instructionReaderBuffer, 0, instructionReaderBuffer.Length);
byte opCodeByte = instructionReaderBuffer[0];
uint uiArg1 = (uint)BitConverter.ToInt32(instructionReaderBuffer, 1);
uint uiArg2 = (uint)BitConverter.ToInt32(instructionReaderBuffer, 5);
readProgram.Add(new CodeInstruction {
OpCode = (OpCode)uiArg1, UIntArg1 = uiArg1, UIntArg2 = uiArg2
});
}
return(readProgram);
}
} = new byte[] { 0xF0, 0x9F, 0x90, 0xA7 }; //"🐧"
public void EncodeCodeToStream(HappyPenguinVMProgram programCode, Stream outputStream)
{
var outputStreamWriter = new BinaryWriter(outputStream);
//Write magic header
outputStreamWriter.Write(MagicHeader);
foreach (var instruction in programCode)
{
outputStreamWriter.Write((byte)instruction.OpCode);
outputStreamWriter.Write(instruction.UIntArg1);
outputStreamWriter.Write(instruction.UIntArg2);
}
outputStreamWriter.Flush();
}
public ProgramExecutor(HappyPenguinVMProgram code, int memorySize)
{
if (memorySize < 0)
{
throw new ArgumentOutOfRangeException(nameof(memorySize), "Negative memory size given");
}
if (memorySize > uint.MaxValue)
{
throw new ArgumentOutOfRangeException(nameof(memorySize), "Memory size to big (addresses are only 16 bits!)");
}
if (memorySize == 0) //auto
{
memorySize = DEFAULT_MEMORY_SIZE;
}
_memorySize = memorySize;
this.code = code;
}
private bool skipProgramCounterUpdate; //Set to true to skip updating the program counter after executing the next instruction. This is set to false automatically after being checked.
public ProgramExecutor(HappyPenguinVMProgram code) : this(code, 0)
{
}