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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
function cheat.comp(olddata, newdata, oper, val, signed, width, endian)
local ret = {}
local ref = {} -- this is a helper for comparing two match lists
local format = ""
local size = olddata.size
if endian == 1 then
format = format .. ">"
else
format = format .. "<"
end
if width == 16 then
size = size & 0xfffe
if signed == 1 then
format = format .. "h"
else
format = format .. "H"
end
elseif width == 32 then
size = size & 0xfffc
if signed == 1 then
format = format .. "l"
else
format = format .. "L"
end
elseif width == 64 then
size = size & 0xfff8
if signed == 1 then
format = format .. "j"
else
format = format .. "J"
end
else
if signed == 1 then
format = format .. "b"
else
format = format .. "B"
end
end
if olddata.start ~= newdata.start or olddata.size ~= newdata.size then
return {}
end
if not val then
val = 0
end
if oper == "+" or oper == "inc" or oper == "<" or oper == "lt" then
for i = 1, size do
local old = string.unpack(format, olddata.block, i)
local new = string.unpack(format, newdata.block, i)
if old < new then
if (val > 0 and (old + val) == new) or val == 0 then
ret[#ret + 1] = { addr = olddata.start + i - 1,
oldval = old,
newval = new}
ref[ret[#ret].addr] = #ret
end
end
end
elseif oper == "-" or oper == "dec" or oper == ">" or oper == "gt" then
for i = 1, size do
local old = string.unpack(format, olddata.block, i)
local new = string.unpack(format, newdata.block, i)
if old > new then
if (val > 0 and (old - val) == new) or val == 0 then
ret[#ret + 1] = { addr = olddata.start + i - 1,
oldval = old,
newval = new}
ref[ret[#ret].addr] = #ret
end
end
end
elseif oper == "=" or oper == "eq" then
for i = 1, size do
local old = string.unpack(format, olddata.block, i)
local new = string.unpack(format, newdata.block, i)
if old == new then
ret[#ret + 1] = { addr = olddata.start + i - 1,
oldval = old,
newval = new}
ref[ret[#ret].addr] = #ret
end
end
elseif oper == "!" or oper == "ne" then
for i = 1, size do
local old = string.unpack(format, olddata.block, i)
local new = string.unpack(format, newdata.block, i)
if old ~= new then
ret[#ret + 1] = { addr = olddata.start + i - 1,
oldval = old,
newval = new}
ref[ret[#ret].addr] = #ret
end
end
elseif oper == "^" or oper == "xor" then
if val >= width then
return {}
end
for i = 1, size do
local old = string.unpack(format, olddata.block, i)
local new = string.unpack(format, newdata.block, i)
if ((old ~ new) & (1 << val)) ~= 0 then
ret[#ret + 1] = { addr = olddata.start + i - 1,
oldval = old,
newval = new}
ref[ret[#ret].addr] = #ret
end
end
end
return ret, ref
end
-- compare successive pairs of blocks from a table returning only addresses that match every comparison
function cheat.compall(dattable, oper, val, signed, width, endian)
if #dattable < 2 then
return {}
end
local matches, refs = cheat.comp(dattable[1], dattable[2], oper, val, signed, width, endian)
local nonmatch = {}
for i = 2, #dattable - 1 do
local matchnext, refsnext = cheat.comp(dattable[i], dattable[i+1], oper, val, signed, width, endian)
for addr, ref in pairs(refs) do
if not refsnext[addr] then
nonmatch[ref] = true
refs[addr] = nil
else
matches[ref].newval = matchnext[refsnext[addr]].newval
end
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, val, signed, width, endian)
local newdata = cheat.save(olddata.space, olddata.start, olddata.size, olddata.space)
return cheat.comp(olddata, newdata, oper, val, signed, width, endian)
end
_G.cf = cheat
local devtable = {}
local devsel = 1
local devcur = 1
local bitwidth = 3
local signed = 0
local endian = 0
local optable = { "<", ">", "=", "!", "^" }
local opsel = 1
local bit = 0
local value = 0
local leftop = 1
local rightop = 0
local matches = {}
local matchsel = 1
local menu_blocks = {}
local midx = { region = 1, init = 2, save = 3, width = 5, signed = 6, endian = 7, op = 8, val = 9,
lop = 10, rop = 11, comp = 12, match = 14 }
local function start()
devtable = {}
devsel = 1
devcur = 1
bitwidth = 3
signed = 0
endian = 0
opsel = 1
bit = 0
value = 0
leftop = 1
rightop = 1
matches = {}
matchsel = 1
menu_blocks = {}
table = cheat.getspaces()
for tag, list in pairs(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
table = cheat.getram()
for tag, ram in pairs(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] = { "Init", "", 0 }
if #menu_blocks ~= 0 then
menu[midx.save] = { "Save current", "", 0 }
menu[midx.save + 1] = { "---", "", "off" }
menu[midx.width] = { "Bit Width", 1 << bitwidth , 0 }
menu_lim(bitwidth, 3, 6, menu[midx.width])
menu[midx.signed] = { "Signed", "false", 0 }
menu_lim(signed, 0, 1, menu[midx.signed])
if signed == 1 then
menu[midx.signed][2] = "true"
end
menu[midx.endian] = { "Endian", "little", 0 }
menu_lim(endian, 0, 1, menu[midx.endian])
if endian == 1 then
menu[midx.endian][2] = "big"
end
menu[midx.op] = { "Operator", optable[opsel], "" }
menu_lim(opsel, 1, #optable, menu[midx.op])
if optable[opsel] == "^" then
menu[midx.val] = { "Bit", bit, "" }
menu_lim(bit, 0, (1 << bitwidth), menu[midx.val])
else
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
end
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.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.comp] = { "Compare", "", 0 }
if #matches ~= 0 then
menu[midx.comp + 1] = { "---", "", "off" }
menu[midx.match] = { "Match block", matchsel, "" }
if #matches == 1 then
menu[midx.match][3] = 0
else
menu_lim(matchsel, 1, #matches, menu[midx.match])
end
for num2, match in ipairs(matches[matchsel]) do
if #menu > 50 then
break
end
local numform = ""
if bitwidth == 4 then
numform = " %04x"
elseif bitwidth == 5 then
numform = " %08x"
elseif bitwidth == 6 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"
else
menu[#menu][2] = "Write"
end
menu_lim(match.mode, 1, 2, menu[#menu])
end
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 Init 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")
ret = true
end
devcur = devsel
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.width then
bitwidth = incdec(bitwidth, 3, 6)
if event == "left" or event == "right" then
bit = 0
end
elseif index == midx.signed then
signed = incdec(signed, 0, 1)
elseif index == midx.endian then
endian = incdec(endian, 0, 1)
elseif index == midx.op then
if event == "left" or event == "right" or event == "comment" then
if optable[opsel] == "<" then
manager:machine():popmessage("Left less than right, value is difference")
elseif optable[opsel] == ">" then
manager:machine():popmessage("Left greater than right, value is difference")
elseif optable[opsel] == "=" then
manager:machine():popmessage("Left equal to right, value is ignored")
elseif optable[opsel] == "!" then
manager:machine():popmessage("Left not equal to right, value is ignored")
elseif optable[opsel] == "^" then
manager:machine():popmessage("Left bit different than right")
end
end
opsel = incdec(opsel, 1, #optable)
elseif index == midx.val then
if optable[opsel] == "^" then
bit = incdec(bit, 0, (1 << bitwidth))
else
value = incdec(value, 0, 100)
end
elseif index == midx.lop then
leftop = incdec(leftop, 1, #menu_blocks[1] + 1)
if (event == "left" or event == "right" or event == "comment") and leftop == #menu_blocks[1] + 1 then
manager:machine():popmessage("Any compares every saved data pair and returns only matches that are true for all. Right operand is ignored.")
end
elseif index == midx.rop then
rightop = incdec(rightop, 1, #menu_blocks[1] + 1)
elseif index == midx.comp then
if event == "select" then
matches = {}
local val
if optable[opsel] == "^" then
val = bit
else
val = value
end
for num = 1, #menu_blocks do
if leftop == #menu_blocks[1] + 1 then
matches[#matches + 1] = cheat.compall(menu_blocks[num], optable[opsel], val, signed,
1 << bitwidth, endian)
elseif rightop == #menu_blocks[1] + 1 then
matches[#matches + 1] = cheat.compcur(menu_blocks[num][leftop], optable[opsel], val,
signed, 1 << bitwidth, endian)
else
matches[#matches + 1] = cheat.comp(menu_blocks[num][leftop], menu_blocks[num][rightop],
optable[opsel], val, signed, 1 << bitwidth, endian)
end
end
ret = true
end
elseif index == midx.match then
matchsel = incdec(matchsel, 0, #matches)
elseif index > midx.match then
local match = matches[matchsel][index - midx.match]
match.mode = incdec(match.mode, 1, 2)
if event == "select" then
local dev = devtable[devcur]
local cheat = { desc = string.format("Test cheat at addr %08x", match.addr), script = {} }
if dev.space.shortname then
cheat.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_u8(" .. 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
else
end
end
end
devsel = devcur
return ret
end
emu.register_menu(menu_callback, menu_populate, "Cheat Finder")
end
return exports
|