private bool AreInstructionTasksEqual(IEnumerable <DataPatcherUnitTask> instructionTasks)
{
using (var executableConnection = new ExecutableConnection(_executableFilePath))
{
foreach (var instructionTask in instructionTasks)
{
var realPosition = InstructionHelper.CalculateRealPositionFromVirtualPosition(instructionTask.VirtualPosition);
var currentInstructions = executableConnection.ReadByteArray(realPosition, instructionTask.Instructions.Length);
#if DEBUG
var virtualPosition = instructionTask.VirtualPosition;
Debug.WriteLine($"Evaluating task {instructionTask.TaskId:D2} at location {virtualPosition:X8} ({realPosition:X8})");
// If current instructions (file) do not equal task instructions (code)
var debugStringCollection = new StringCollection();
for (var i = 0; i < currentInstructions.Count(); i++)
{
if (currentInstructions[i].Equals(instructionTask.Instructions[i]))
{
continue;
}
var debugVirtualPosition = virtualPosition + i;
var debugRealPosition = realPosition + i;
debugStringCollection.Add($"Mismatch at location {debugVirtualPosition:X8} ({debugRealPosition:X8}) at byte index {i:X8}. Value {currentInstructions[i]:X2} vs. {instructionTask.Instructions[i]:X2} (File vs. Code).");
}
if (debugStringCollection.Count > 0)
{
Debug.WriteLine("WARNING - Instructions in code are not equal to instructions in file.");
foreach (var line in debugStringCollection)
{
Debug.WriteLine(line);
}
return(false);
}
#else
// If current instructions (file) do not equal task instructions (code)
if (!currentInstructions.SequenceEqual(instructionTask.Instructions))
{
return(false);
}
#endif
}
return(true);
}
}
/// <summary>
/// Applys the bypass on all detected references to jump functions.
/// This method is only intended for use with gpw.exe v1.01b.
/// Do not invoke this method more than once on the same file.
/// </summary>
public void Apply()
{
// Stats counters
var textBypassStatsCounter = 0;
var text68BypassStatsCounter = 0;
var textE8BypassStatsCounter = 0;
var textC704BypassStatsCounter = 0;
var textC705BypassStatsCounter = 0;
var textC745BypassStatsCounter = 0;
var textC784BypassStatsCounter = 0;
var rdataBypassStatsCounter = 0;
var dataBypassStatsCounter = 0;
var totalBypassesStatsCounter = 0;
// Define range where jump functions are located
const int jumpFunctionFirstReference = 0x00401000; // 0x00000400
const int jumpFunctionLastReference = 0x0040452A; // 0x0000392A
const int jumpFunctionReferenceStep = 0x00000005; // Bytes
// Define range of .text section
const int textSectionFirstByte = 0x00407A60;
const int textSectionLastByte = 0x00689FFF;
// Define range of .rdata section
const int rdataSectionFirstByte = 0x015ED000;
const int rdataSectionLastByte = 0x015EF7CF;
// Define range of .data section
const int dataSectionFirstByte = 0x015F0000;
const int dataSectionLastByte = 0x0160CBFF;
// Create collection to hold details of each jump function
var jumpFunctions = new Collection <JumpFunction>();
// Populate collection with the positions of the jump functions
for (var i = jumpFunctionFirstReference; i <= jumpFunctionLastReference; i += jumpFunctionReferenceStep)
{
jumpFunctions.Add(new JumpFunction()
{
Position = i
});
}
// Collection of changes to make after read
var jumpBypasses = new Collection <JumpFunction>();
// Open file and read
using (var executableConnection = new ExecutableConnection(_executableFilePath))
{
// Populate collection with the referenced function inside each jump function
foreach (var item in jumpFunctions)
{
var instructions = new byte[4];
instructions = executableConnection.ReadByteArray(InstructionHelper.CalculateRealPositionFromVirtualPosition(item.Position) + 1, instructions.Length);
item.Function = item.Position + 5 + BitConverter.ToInt32(instructions, 0);
}
// Analyse .text section for opcodes with references to jump functions
for (var i = textSectionFirstByte; i <= textSectionLastByte - 4; i++)
{
// Read two bytes
var opcodeCheck = executableConnection.ReadByteArray(InstructionHelper.CalculateRealPositionFromVirtualPosition(i), 2);
// Check for matching opcodes
if (opcodeCheck[0] == 0x68)
{
// Read last four bytes of five byte signature
var referenceCheckBytes = executableConnection.ReadByteArray(InstructionHelper.CalculateRealPositionFromVirtualPosition(i + 1), 4);
var referenceCheckValue = BitConverter.ToInt32(referenceCheckBytes, 0);
// Do bytes match a reference to a jump function in the collection
foreach (var item in jumpFunctions)
{
if (referenceCheckValue == item.Position)
{
// Add bypass to collection
jumpBypasses.Add(new JumpFunction()
{
Position = i + 1, Function = item.Function
});
textBypassStatsCounter++;
text68BypassStatsCounter++;
}
}
}
else if (opcodeCheck[0] == 0xE8)
{
// Read last four bytes of five byte signature
var referenceCheckBytes = executableConnection.ReadByteArray(InstructionHelper.CalculateRealPositionFromVirtualPosition(i + 1), 4);
var referenceCheckValue = i + 5 + BitConverter.ToInt32(referenceCheckBytes, 0);
// Do bytes match a reference to a jump function in the collection
foreach (var item in jumpFunctions)
{
if (referenceCheckValue == item.Position)
{
// Calc relative function position for opcode xE8
var functionOffset = BitConverter.GetBytes(item.Function - (i + 5));
// Add bypass to collection
jumpBypasses.Add(new JumpFunction()
{
Position = i + 1, Function = BitConverter.ToInt32(functionOffset, 0)
});
textBypassStatsCounter++;
textE8BypassStatsCounter++;
}
}
}
else if ((opcodeCheck[0] == 0xC7) && (opcodeCheck[1] == 0x04))
{
// Read last four bytes of eleven byte signature
var referenceCheckBytes = executableConnection.ReadByteArray(InstructionHelper.CalculateRealPositionFromVirtualPosition(i + 7), 4);
var referenceCheckValue = BitConverter.ToInt32(referenceCheckBytes, 0);
// Do bytes match a reference to a jump function in the collection
foreach (var item in jumpFunctions)
{
if (referenceCheckValue == item.Position)
{
// Add bypass to collection
jumpBypasses.Add(new JumpFunction()
{
Position = i + 7, Function = item.Function
});
textBypassStatsCounter++;
textC704BypassStatsCounter++;
}
}
}
else if ((opcodeCheck[0] == 0xC7) && (opcodeCheck[1] == 0x05))
{
// Read last four bytes of ten byte signature
var referenceCheckBytes = executableConnection.ReadByteArray(InstructionHelper.CalculateRealPositionFromVirtualPosition(i + 6), 4);
var referenceCheckValue = BitConverter.ToInt32(referenceCheckBytes, 0);
// Do bytes match a reference to a jump function in the collection
foreach (var item in jumpFunctions)
{
if (referenceCheckValue == item.Position)
{
// Add bypass to collection
jumpBypasses.Add(new JumpFunction()
{
Position = i + 6, Function = item.Function
});
textBypassStatsCounter++;
textC705BypassStatsCounter++;
}
}
}
else if ((opcodeCheck[0] == 0xC7) && (opcodeCheck[1] == 0x45))
{
// Read last four bytes of seven byte signature
var referenceCheckBytes = executableConnection.ReadByteArray(InstructionHelper.CalculateRealPositionFromVirtualPosition(i + 3), 4);
var referenceCheckValue = BitConverter.ToInt32(referenceCheckBytes, 0);
// Do bytes match a reference to a jump function in the collection
foreach (var item in jumpFunctions)
{
if (referenceCheckValue == item.Position)
{
// Add bypass to collection
jumpBypasses.Add(new JumpFunction()
{
Position = i + 3, Function = item.Function
});
textBypassStatsCounter++;
textC745BypassStatsCounter++;
}
}
}
else if ((opcodeCheck[0] == 0xC7) && (opcodeCheck[1] == 0x84))
{
// Read last four bytes of eleven byte signature
var referenceCheckBytes = executableConnection.ReadByteArray(InstructionHelper.CalculateRealPositionFromVirtualPosition(i + 7), 4);
var referenceCheckValue = BitConverter.ToInt32(referenceCheckBytes, 0);
// Do bytes match a reference to a jump function in the collection
foreach (var item in jumpFunctions)
{
if (referenceCheckValue == item.Position)
{
// Add bypass to collection
jumpBypasses.Add(new JumpFunction()
{
Position = i + 7, Function = item.Function
});
textBypassStatsCounter++;
textC784BypassStatsCounter++;
}
}
}
}
// Analyse .rdata section for references to jump functions
for (var i = rdataSectionFirstByte; i <= rdataSectionLastByte - 3; i++)
{
// Read four bytes
var referenceCheckBytes = executableConnection.ReadByteArray(InstructionHelper.CalculateRealPositionFromVirtualPosition(i), 4);
var referenceCheckValue = BitConverter.ToInt32(referenceCheckBytes, 0);
// Do bytes match a reference to a jump function in the collection
foreach (var item in jumpFunctions)
{
if (referenceCheckValue == item.Position)
{
// Add bypass to collection
jumpBypasses.Add(new JumpFunction()
{
Position = i, Function = item.Function
});
rdataBypassStatsCounter++;
}
}
}
// Analyse .data section for references to jump functions
for (var i = dataSectionFirstByte; i <= dataSectionLastByte - 3; i++)
{
// Read four bytes
var referenceCheckBytes = executableConnection.ReadByteArray(InstructionHelper.CalculateRealPositionFromVirtualPosition(i), 4);
var referenceCheckValue = BitConverter.ToInt32(referenceCheckBytes, 0);
// Do bytes match a reference to a jump function in the collection
foreach (var item in jumpFunctions)
{
if (referenceCheckValue == item.Position)
{
// Add bypass to collection
jumpBypasses.Add(new JumpFunction()
{
Position = i, Function = item.Function
});
dataBypassStatsCounter++;
}
}
}
}
// Open file and write
using (var executableConnection = new ExecutableConnection(_executableFilePath))
{
// Apply bypasses
foreach (var item in jumpBypasses)
{
// Write four bytes
executableConnection.WriteByteArray(InstructionHelper.CalculateRealPositionFromVirtualPosition(item.Position), BitConverter.GetBytes(item.Function));
totalBypassesStatsCounter++;
}
// Remove redundant jump functions
var clearByteArray = new byte[0x352F];
for (var i = 0; i < clearByteArray.Length; i++)
{
clearByteArray[i] = 0xCC; // Fill array with int3 opcode
}
executableConnection.WriteByteArray(InstructionHelper.CalculateRealPositionFromVirtualPosition(jumpFunctionFirstReference), clearByteArray);
}
Debug.WriteLine(" .text section bypass count: " + textBypassStatsCounter);
Debug.WriteLine(" .text opCode 68 count: " + text68BypassStatsCounter);
Debug.WriteLine(" .text opCode E8 count: " + textE8BypassStatsCounter);
Debug.WriteLine(" .text opCode C7 04 count: " + textC704BypassStatsCounter);
Debug.WriteLine(" .text opCode C7 05 count: " + textC705BypassStatsCounter);
Debug.WriteLine(" .text opCode C7 45 count: " + textC745BypassStatsCounter);
Debug.WriteLine(" .text opCode C7 84 count: " + textC784BypassStatsCounter);
Debug.WriteLine(".rdata section bypass count: " + rdataBypassStatsCounter);
Debug.WriteLine(" .data section bypass count: " + dataBypassStatsCounter);
Debug.WriteLine("----------------------------");
Debug.WriteLine(" Total bypasses: " + totalBypassesStatsCounter);
}
/// <summary>
/// Applys the new switch idiom to all predefined target addresses within.
/// This method is only intended for use with gpw.exe v1.01b.
/// Do not invoke this method more than once on the same file.
/// </summary>
public void Apply()
{
// New instruction template, 0x00 will be overwritten by jump/indirect table locations
var newInstructions = new byte[] {
0x33, 0xD2, 0x8A, 0x90, 0x00, 0x00, 0x00, 0x00, 0xFF,
0x24, 0x95, 0x00, 0x00, 0x00, 0x00, 0x90, 0x90, 0x90
};
// File location of each switch idiom to modify
var switchIdiomLocation = new long[] {
0x00021A9C, 0x0002EFE2, 0x00034FC5, 0x000387AE, 0x0003AD71, 0x00044C99,
0x0004EFD4, 0x0004FEDF, 0x0005F0EB, 0x00078996, 0x0008E2F7, 0x0008E850,
0x0008EE9E, 0x00093B02, 0x0009507E, 0x0009ED62, 0x000A5F9E, 0x001130A4,
0x001131B2, 0x00116871, 0x001170FA, 0x00117198, 0x001180EF, 0x0011C88A,
0x00120DB0, 0x00120E1E, 0x0012DE99, 0x00130D87, 0x00138A8E, 0x00139B64,
0x0013F6D1, 0x0013FE4B, 0x0013FF79, 0x001499BF, 0x00149A59, 0x0014A727,
0x0014A7F6, 0x0014B09F, 0x0014B5EF, 0x0014BC5D, 0x0014BCEE, 0x00154C42,
0x00154F47, 0x00155176, 0x0015533B, 0x001556C7, 0x0015BC0B, 0x0015DC59,
0x0015DE57, 0x0015DF24, 0x0015DFA2, 0x0015E1C0, 0x001675AA, 0x0017344E,
0x0018BF05, 0x0019012B, 0x001A1AEE, 0x001A1D23, 0x001A1DCC, 0x001A2F62,
0x001AE631, 0x001B4CAE, 0x001B50EC, 0x001D4F47, 0x001DCC1B, 0x001DE2A5,
0x001E30E6, 0x001F4FE5, 0x001F51EF, 0x001F74D8, 0x00203BFE, 0x0021862C,
0x00218788, 0x00218977, 0x0021BFB7, 0x0021C26A, 0x0025FF17, 0x0026028F,
0x0026082B, 0x002622D7, 0x002638F9, 0x002739E7, 0x00276F01, 0x00276FE8,
0x00278CB2, 0x00278D53, 0x00278FDD, 0x002790F0
};
// For every switch idiom (represented by the target address)
for (var i = 0; i < switchIdiomLocation.Length; i++)
{
var instructions = new byte[18];
// Get current instructions at target address
using (var executableConnection = new ExecutableConnection(_executableFilePath))
{
instructions = executableConnection.ReadByteArray(switchIdiomLocation[i], instructions.Length);
}
// Extract table location values
var indirectTableLocation = new byte[4];
var jumpTableLocation = new byte[4];
// Indirect table location is represented in little endian byte order
for (var j = 0; j < indirectTableLocation.Length; j++)
{
// Read four bytes
indirectTableLocation[j] = instructions[j + 2];
}
// Jump table location is represented in little endian byte order
for (var j = 0; j < jumpTableLocation.Length; j++)
{
// Read four bytes
jumpTableLocation[j] = instructions[j + 14];
}
// Create copy of new instructions by overwriting current instructions
Array.Copy(newInstructions, instructions, instructions.Length);
// Modify with new instructions
for (var j = 4; j < 8; j++)
{
// Write four bytes
instructions[j] = indirectTableLocation[j - 4];
}
for (var j = 11; j < 15; j++)
{
// Write four bytes
instructions[j] = jumpTableLocation[j - 11];
}
using (var executableConnection = new ExecutableConnection(_executableFilePath))
{
// Write new instructions to target address
executableConnection.WriteByteArray(switchIdiomLocation[i], instructions);
}
}
}