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-- license:BSD-3-Clause
-- copyright-holders:Carl
-- This includes a library of functions to be used at the Lua console as cf.getspaces() etc...
local exports = {}
exports.name = "cheatfind"
exports.version = "0.0.1"
exports.description = "Cheat finder helper library"
exports.license = "The BSD 3-Clause License"
exports.author = { name = "Carl" }
local cheatfind = exports
function cheatfind.startplugin()
local cheat = {}
-- return table of devices and spaces
function cheat.getspaces()
local spaces = {}
for tag, device in pairs(manager:machine().devices) do
if device.spaces then
spaces[tag] = {}
for name, space in pairs(device.spaces) do
spaces[tag][name] = space
end
end
end
return spaces
end
-- return table of ram devices
function cheat.getram()
local ram = {}
for tag, device in pairs(manager:machine().devices) do
if device:shortname() == "ram" then
ram[tag] = {}
ram[tag].dev = device
ram[tag].size = emu.item(device.items["0/m_size"]):read(0)
end
end
return ram
end
-- save data block
function cheat.save(space, start, size)
local data = { block = "", start = start, size = size, space = space }
if space.shortname then
if space:shortname() == "ram" then
data.block = emu.item(space.items["0/m_pointer"]):read_block(start, size)
if not data.block then
return nil
end
end
else
local block = ""
for i = start, start + size do
block = block .. string.pack("B", space:read_u8(i))
end
data.block = block
end
return data
end
-- compare two data blocks, format is as lua string.unpack, bne and beq val is table of masks
function cheat.comp(olddata, newdata, oper, format, val, bcd)
local ret = {}
local ref = {} -- this is a helper for comparing two match lists
local bitmask = nil
local function bne(a, b, val, addr)
if type(val) ~= "table" then
bitmask = a ~ b
return bitmask ~= 0
elseif not val[addr] then
return false
else
bitmask = (a ~ b) & val[addr]
return bitmask ~= 0
end
end
local function beq(a, b, val, addr)
if type(val) ~= "table" then
bitmask = ~a ~ b
return bitmask ~= 0
elseif not val[addr] then
return false
else
bitmask = (~a ~ b) & val[addr]
return bitmask ~= 0
end
end
local cfoper = {
lt = function(a, b, val) return (a < b and val == 0) or (val > 0 and (a + val) == b) end,
gt = function(a, b, val) return (a > b and val == 0) or (val > 0 and (a - val) == b) end,
eq = function(a, b, val) return a == b end,
ne = function(a, b, val) return (a ~= b and val == 0) or
(val > 0 and ((a - val) == b or (a + val) == b)) end,
bne = bne, beq = beq }
local function check_bcd(val)
local a = val + 0x0666666666666666
a = a ~ val
return (a & 0x1111111111111110) == 0
end
local function frombcd(val)
local result = 0
local mul = 1
while val ~= 0 do
result = result + ((val % 16) * mul)
val = val >> 4
mul = mul * 10
end
return result
end
if olddata.start ~= newdata.start or olddata.size ~= newdata.size or not cfoper[oper] then
return {}
end
if not val then
val = 0
end
for i = 1, olddata.size do
local old = string.unpack(format, olddata.block, i)
local new = string.unpack(format, newdata.block, i)
local oldc, newc = old, new
local comp = false
local addr = olddata.start + i - 1
if not bcd or (check_bcd(old) and check_bcd(new)) then
if bcd then
oldc = frombcd(old)
newc = frombcd(new)
end
if cfoper[oper](oldc, newc, val, addr) then
ret[#ret + 1] = { addr = addr,
oldval = old,
newval = new,
bitmask = bitmask }
ref[ret[#ret].addr] = #ret
end
end
end
return ret, ref
end
local function check_val(oper, val, matches)
if oper ~= "beq" and oper ~= "bne" then
return val
elseif not matches or not matches[1].bitmask then
return nil
end
local masks = {}
for num, match in pairs(matches) do
masks[match.addr] = match.bitmask
end
return masks
end
-- compare two blocks and filter by table of previous matches
function cheat.compnext(olddata, newdata, oldmatch, oper, format, val, bcd)
local matches, refs = cheat.comp(olddata, newdata, oper, format, check_val(oper, val, oldmatch), bcd)
local nonmatch = {}
local oldrefs = {}
for num, match in pairs(oldmatch) do
oldrefs[match.addr] = num
end
for addr, ref in pairs(refs) do
if not oldrefs[addr] then
nonmatch[ref] = true
refs[addr] = nil
else
matches[ref].oldval = oldmatch[oldrefs[addr]].oldval
end
end
local resort = {}
for num, match in pairs(matches) do
if not nonmatch[num] then
resort[#resort + 1] = match
end
end
return resort
end
-- compare a data block to the current state
function cheat.compcur(olddata, oper, format, val, bcd)
local newdata = cheat.save(olddata.space, olddata.start, olddata.size, olddata.space)
return cheat.comp(olddata, newdata, oper, format, val, bcd)
end
-- compare a data block to the current state and filter
function cheat.compcurnext(olddata, oldmatch, oper, format, val, bcd)
local newdata = cheat.save(olddata.space, olddata.start, olddata.size, olddata.space)
return cheat.compnext(olddata, newdata, oldmatch, oper, format, val, bcd)
end
_G.cf = cheat
local devtable = {}
local devsel = 1
local devcur = 1
local formtable = { "<B", ">B", "<b", ">b", "<H", ">H", "<h", ">h", "<L", ">L", "<l", ">l", "<J", ">J", "<j", ">j" }
local formname = { "little u8", "big u8", "little s8", "big s8", "little u16", "big u16", "little s16", "big s16",
"little u32", "big u32", "little s32", "big s32", "little u64", "big u64", "little s64", "big s64" }
local width = 1
local bcd = 0
local optable = { "lt", "gt", "eq", "ne", "beq", "bne" }
local opsel = 1
local value = 0
local leftop = 1
local rightop = 0
local matches = {}
local matchsel = 1
local menu_blocks = {}
local midx = { region = 1, init = 2, undo = 3, save = 4, lop = 6, op = 7, rop = 8, val = 9,
width = 11, bcd = 12, comp = 13, match = 15, watch = 0 }
local watches = {}
local function start()
devtable = {}
devsel = 1
devcur = 1
width = 1
bcd = 0
opsel = 1
value = 0
leftop = 1
rightop = 1
matches = {}
matchsel = 1
menu_blocks = {}
watches = {}
local space_table = cheat.getspaces()
for tag, list in pairs(space_table) do
if list.program then
local ram = {}
for num, entry in pairs(list.program.map) do
if entry.writetype == "ram" then
ram[#ram + 1] = { offset = entry.offset, size = entry.endoff - entry.offset }
end
end
if next(ram) then
devtable[#devtable + 1] = { tag = tag, space = list.program, ram = ram }
end
end
end
space_table = cheat.getram()
for tag, ram in pairs(space_table) do
devtable[#devtable + 1] = { tag = tag, space = ram.dev, ram = {{ offset = 0, size = ram.size }} }
end
end
emu.register_start(start)
local function menu_populate()
local menu = {}
local function menu_lim(val, min, max, menuitem)
if val == min then
menuitem[3] = "r"
elseif val == max then
menuitem[3] = "l"
else
menuitem[3] = "lr"
end
end
menu[midx.region] = { "CPU or RAM", devtable[devsel].tag, 0 }
if #devtable == 1 then
menu[midx.region][3] = 0
else
menu_lim(devsel, 1, #devtable, menu[midx.region])
end
menu[midx.init] = { "Start new search", "", 0 }
if #menu_blocks ~= 0 then
menu[midx.undo] = { "Undo last search -- #" .. #matches, "", 0 }
menu[midx.save] = { "Save current -- #" .. #menu_blocks[1] + 1, "", 0 }
menu[midx.save + 1] = { "---", "", "off" }
menu[midx.lop] = { "Left operand", leftop, "" }
menu_lim(leftop, 1, #menu_blocks[1] + 1, menu[midx.lop])
if leftop == #menu_blocks[1] + 1 then
menu[midx.lop][2] = "All"
end
menu[midx.op] = { "Operator", optable[opsel], "" }
menu_lim(opsel, 1, #optable, menu[midx.op])
menu[midx.rop] = { "Right operand", rightop, "" }
menu_lim(rightop, 1, #menu_blocks[1] + 1, menu[midx.rop])
if rightop == #menu_blocks[1] + 1 then
menu[midx.rop][2] = "Current"
end
menu[midx.val] = { "Value", value, "" }
menu_lim(value, 0, 100, menu[midx.val]) -- max value?
if value == 0 then
menu[midx.val][2] = "Any"
end
menu[midx.val + 1] = { "---", "", "off" }
menu[midx.width] = { "Data Format", formname[width], 0 }
menu_lim(width, 1, #formtable, menu[midx.width])
menu[midx.bcd] = { "BCD", "Off", 0 }
menu_lim(bcd, 0, 1, menu[midx.bcd])
if bcd == 1 then
menu[midx.bcd][2] = "On"
end
menu[midx.comp] = { "Compare", "", 0 }
if #matches ~= 0 then
menu[midx.comp + 1] = { "---", "", "off" }
menu[midx.match] = { "Match block", matchsel, "" }
if #matches[#matches] == 1 then
menu[midx.match][3] = 0
else
menu_lim(matchsel, 1, #matches[#matches], menu[midx.match])
end
for num2, match in ipairs(matches[#matches][matchsel]) do
if #menu > 50 then
break
end
local numform = ""
local bitwidth = formtable[width]:sub(2, 2):lower()
if bitwidth == "h" then
numform = " %04x"
elseif bitwidth == "l" then
numform = " %08x"
elseif bitwidth == "j" then
numform = " %016x"
else
numform = " %02x"
end
menu[#menu + 1] = { string.format("%08x" .. numform .. numform, match.addr, match.oldval,
match.newval), "", 0 }
if not match.mode then
match.mode = 1
end
if match.mode == 1 then
menu[#menu][2] = "Test"
elseif match.mode == 2 then
menu[#menu][2] = "Write"
else
menu[#menu][2] = "Watch"
end
menu_lim(match.mode, 1, 3, menu[#menu])
end
end
if #watches ~= 0 then
menu[#menu + 1] = { "Clear Watches", "", 0 }
midx.watch = #menu
end
end
return menu
end
local function menu_callback(index, event)
local ret = false
local function incdec(val, min, max)
if event == "left" and val ~= min then
val = val - 1
ret = true
elseif event == "right" and val ~= max then
val = val + 1
ret = true
end
return val
end
if index == midx.region then
if (event == "left" or event == "right") and #menu_blocks ~= 0 then
manager:machine():popmessage("Changes to this only take effect when \"Start new search\" is selected")
end
devsel = incdec(devsel, 1, #devtable)
return true
elseif index == midx.init then
if event == "select" then
menu_blocks = {}
matches = {}
for num, region in ipairs(devtable[devcur].ram) do
menu_blocks[num] = {}
menu_blocks[num][1] = cheat.save(devtable[devcur].space, region.offset, region.size)
end
manager:machine():popmessage("Data cleared and current state saved")
watches = {}
leftop = 1
rightop = 2
ret = true
end
devcur = devsel
elseif index == midx.undo then
if event == "select" and #matches > 0 then
matches[#matches] = nil
end
ret = true
elseif index == midx.save then
if event == "select" then
for num, region in ipairs(devtable[devcur].ram) do
menu_blocks[num][#menu_blocks[num] + 1] = cheat.save(devtable[devcur].space, region.offset, region.size)
end
manager:machine():popmessage("Current state saved")
ret = true
end
elseif index == midx.op then
opsel = incdec(opsel, 1, #optable)
if event == "left" or event == "right" or event == "comment" then
if optable[opsel] == "lt" then
manager:machine():popmessage("Left less than right, value is difference")
elseif optable[opsel] == "gt" then
manager:machine():popmessage("Left greater than right, value is difference")
elseif optable[opsel] == "eq" then
manager:machine():popmessage("Left equal to right, value is ignored")
elseif optable[opsel] == "ne" then
manager:machine():popmessage("Left not equal to right, value is difference")
elseif optable[opsel] == "beq" then
manager:machine():popmessage("Left equal to right with bitmask, value is ignored")
elseif optable[opsel] == "bne" then
manager:machine():popmessage("Left not equal to right with bitmask, value is ignored")
end
end
elseif index == midx.val then
value = incdec(value, 0, 100)
elseif index == midx.lop then
leftop = incdec(leftop, 1, #menu_blocks[1])
elseif index == midx.rop then
rightop = incdec(rightop, 1, #menu_blocks[1] + 1)
elseif index == midx.width then
width = incdec(width, 1, #formtable)
elseif index == midx.bcd then
bcd = incdec(bcd, 0, 1)
elseif index == midx.comp then
if event == "select" then
if #matches == 0 then
matches[1] = {}
for num = 1, #menu_blocks do
if rightop == #menu_blocks[1] + 1 then
matches[1][num] = cheat.compcur(menu_blocks[num][leftop], optable[opsel],
formtable[width], value, bcd == 1)
else
matches[1][num] = cheat.comp(menu_blocks[num][leftop], menu_blocks[num][rightop],
optable[opsel], formtable[width], value, bcd == 1)
end
end
else
lastmatch = matches[#matches]
matches[#matches + 1] = {}
for num = 1, #menu_blocks do
if rightop == #menu_blocks[1] + 1 then
matches[#matches][num] = cheat.compcurnext(menu_blocks[num][leftop], lastmatch[num],
optable[opsel], formtable[width], value, bcd == 1)
else
matches[#matches][num] = cheat.compnext(menu_blocks[num][leftop], menu_blocks[num][rightop],
lastmatch[num], optable[opsel], formtable[width], value, bcd == 1)
end
end
end
ret = true
end
elseif index == midx.match then
matchsel = incdec(matchsel, 0, #matches[#matches])
elseif index == midx.watch then
watches = {}
ret = true
elseif index > midx.match then
local match = matches[#matches][matchsel][index - midx.match]
match.mode = incdec(match.mode, 1, 3)
if event == "select" then
local dev = devtable[devcur]
local cheat = { desc = string.format("Test cheat at addr %08x", match.addr), script = {} }
local wid = formtable[width]:sub(2, 2):lower()
if wid == "h" then
wid = "u16"
elseif wid == "l" then
wid = "u32"
elseif wid == "j" then
wid = "u64"
else
wid = "u8"
end
if dev.space.shortname then
cheat.ram = { ram = dev.tag }
cheat.script.on = "ram:write(" .. match.addr .. "," .. match.newval .. ")"
else
cheat.space = { cpu = { tag = dev.tag, type = "program" } }
cheat.script.on = "cpu:write_" .. wid .. "(" .. match.addr .. "," .. match.newval .. ")"
end
if match.mode == 1 then
if not _G.ce then
manager:machine():popmessage("Cheat engine not available")
else
_G.ce.inject(cheat)
end
elseif match.mode == 2 then
local filename = string.format("%s_%08x_cheat.json", emu.romname(), match.addr)
local json = require("json")
local file = io.open(filename, "w")
file:write(json.stringify({[1] = cheat}))
file:close()
manager:machine():popmessage("Cheat written to " .. filename)
else
local func = "return space:read"
local env = { space = devtable[devcur].space }
if not dev.space.shortname then
func = func .. "_" .. wid
end
func = func .. "(" .. match.addr .. ")"
watches[#watches + 1] = { addr = match.addr, func = load(func, func, "t", env) }
end
end
end
devsel = devcur
return ret
end
emu.register_menu(menu_callback, menu_populate, "Cheat Finder")
emu.register_frame_done(function ()
local tag, screen = next(manager:machine().screens)
local height = mame_manager:ui():get_line_height()
for num, watch in ipairs(watches) do
screen:draw_text("left", num * height, string.format("%08x %08x", watch.addr, watch.func()))
end
end)
end
return exports
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