Add some memory reading stuff, based on many other open source projects

pkg/memory/offset.go

@@ -0,0 +1,56 @@
+package memory
+
+import "encoding/binary"
+
+type Offset struct {
+	GameData     uintptr
+	UnitTable    uintptr
+	UI           uintptr
+	Hover        uintptr
+	Expansion    uintptr
+	RosterOffset uintptr
+}
+
+func calculateOffsets(process Process) Offset {
+	// ignoring errors, always best practices
+	memory, _ := process.getProcessMemory()
+
+	// GameReader
+	pattern := process.FindPattern(memory, "\x44\x88\x25\x00\x00\x00\x00\x66\x44\x89\x25\x00\x00\x00\x00", "xxx????xxxx????")
+	bytes := process.ReadBytesFromMemory(pattern+0x3, 4)
+	offsetInt := uintptr(binary.LittleEndian.Uint32(bytes))
+	gameDataOffset := (pattern - process.moduleBaseAddressPtr) - 0x121 + offsetInt
+
+	// UnitTable
+	pattern = process.FindPattern(memory, "\x48\x03\xC7\x49\x8B\x8C\xC6", "xxxxxxx")
+	bytes = process.ReadBytesFromMemory(pattern+7, 4)
+	unitTableOffset := uintptr(binary.LittleEndian.Uint32(bytes))
+
+	// UI
+	pattern = process.FindPattern(memory, "\x40\x84\xed\x0f\x94\x05", "xxxxxx")
+	uiOffset := process.ReadUInt(pattern+6, Uint32)
+	uiOffsetPtr := (pattern - process.moduleBaseAddressPtr) + 10 + uintptr(uiOffset)
+
+	// Hover
+	pattern = process.FindPattern(memory, "\xc6\x84\xc2\x00\x00\x00\x00\x00\x48\x8b\x74\x24\x00", "xxx?????xxxx?")
+	hoverOffset := process.ReadUInt(pattern+3, Uint32) - 1
+
+	// Expansion
+	pattern = process.FindPattern(memory, "\x48\x8B\x05\x00\x00\x00\x00\x48\x8B\xD9\xF3\x0F\x10\x50\x00", "xxx????xxxxxxx?")
+	offsetPtr := uintptr(process.ReadUInt(pattern+3, Uint32))
+	expOffset := pattern - process.moduleBaseAddressPtr + 7 + offsetPtr
+
+	// Party members offset
+	pattern = process.FindPattern(memory, "\x02\x45\x33\xD2\x4D\x8B", "xxxxxx")
+	offsetPtr = uintptr(process.ReadUInt(pattern-3, Uint32))
+	rosterOffset := pattern - process.moduleBaseAddressPtr + 1 + offsetPtr
+
+	return Offset{
+		GameData:     gameDataOffset,
+		UnitTable:    unitTableOffset,
+		UI:           uiOffsetPtr,
+		Hover:        uintptr(hoverOffset),
+		Expansion:    expOffset,
+		RosterOffset: rosterOffset,
+	}
+}