private ReplaceInstruction CreateReplaceInstruction(string[] tokens, int lineNumber)
{
// we need THREE tokens
if (tokens.Length < 3)
{
Console.WriteLine("Instruction " + lineNumber + " is 'replace' but is missing anything to replace with");
return(null);
}
if (tokens[1].Length != tokens[2].Length)
{
Console.WriteLine("Instruction " + lineNumber + " has key and replacement of different lengths: " + tokens[1] + " vs " + tokens[2]);
return(null);
}
ReplaceInstruction r = new ReplaceInstruction(tokens[1], tokens[2]);
return(r);
}
static private void ProcessInstructions(List <SearchInstruction> instructions, byte[] bytes)
{
int instrIndex = 0;
int byteIndex = 0;
while (instrIndex < instructions.Count)
{
SearchInstruction current = instructions[instrIndex];
Console.WriteLine(current.ToString());
int newIndex = current.FindMatch(bytes, byteIndex);
if (newIndex < 0)
{
Console.WriteLine("Failed to find match for instruction " + instrIndex);
return;
}
if (current is ReplaceInstruction)
{
ReplaceInstruction r = (current as ReplaceInstruction);
r.ReplaceAt(bytes, newIndex);
}
byteIndex = newIndex + current.MatchLength;
instrIndex++;
}
}