mirror of
https://github.com/holub/mame
synced 2025-06-11 15:16:09 +03:00
267 lines
8.6 KiB
Lua
267 lines
8.6 KiB
Lua
-- converter for simple cheats
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-- simple cheats are single address every frame ram or gg,ar cheats in one file called cheat.simple
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--
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-- ram cheat format: <set name>,<cputag>,<hex offset>,<b|w|d|q - size>,<hex value>,<desc>
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-- only program address space is supported, comments are prepended with ;
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-- size is b - u8, w - u16, d - u32, q - u64
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--
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-- gg,ar cheat format: <set name>,<gg|ar - type>,<code>,<desc> like "nes/smb,gg,SXIOPO,Infinite Lives"
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-- gg for game genie -- nes, snes, megadriv, gamegear, gameboy
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-- ar for action replay -- nes
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--
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-- set name is <softlist>/<entry> like "nes/smb" for softlist items
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-- Don't use commas in the description
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local simple = {}
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simple.romset = "????"
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function simple.filename(name)
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simple.romset = name
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return "cheat.simple"
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end
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local codefuncs = {}
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function codefuncs.nes_gg(desc, code)
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local xlate = { A = 0, P = 1, Z = 2, L = 3, G = 4, I = 5, T = 6, Y = 7, E = 8,
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O = 9, X = 10, U = 11, K = 12, S = 13, V = 14, N = 15 }
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local cheat = { desc = desc, region = { rom = ":nes_slot:cart:prg_rom" } }
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local value = 0
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code:upper():gsub("(.)", function(s)
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if not xlate[s] then
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error("error parsing game genie cheat " .. desc)
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end
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value = (value << 4) | xlate[s]
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end)
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local addr, newval, comp
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cheat.script = { off = "if on then rom:write_u8(addr, save) end" }
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if #code == 6 then
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addr = ((value >> 4) & 7) | ((value >> 8) & 0x78) | ((value >> 12) & 0x80) | ((value << 8) & 0x700) | ((value << 4) & 0x7800)
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newval = ((value >> 20) & 7) | (value & 8) | ((value >> 12) & 0x70) | ((value >> 16) & 0x80)
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cheat.script.on = string.format([[
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on = true
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addr = %d
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save = rom:read_u8(addr)
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rom:write_u8(addr, %d)]], addr, newval)
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elseif #code == 8 then
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addr = ((value >> 12) & 7) | ((value >> 16) & 0x78) | ((value >> 20) & 0x80) | (value & 0x700) | ((value >> 4) & 0x7800)
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newval = ((value >> 28) & 7) | (value & 8) | ((value >> 20) & 0x70) | ((value >> 24) & 0x80)
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comp = ((value >> 4) & 7) | ((value >> 8) & 8) | ((value << 4) & 0x70) | ((value << 1) & 0x80)
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-- assume 8K banks, 32K also common but is an easy multiple of 8K
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cheat.script.on = string.format([[
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addr = %d
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save = %d
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for i = 0, rom.size, 8192 do
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if rom:read_u8(i + addr) == save then
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on = true
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addr = i + addr
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rom:write_u8(addr, %d)
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break
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end
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end]], addr & 0x3fff, comp, newval)
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else
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error("error game genie cheat incorrect length " .. desc)
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end
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return cheat
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end
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function codefuncs.nes_ar(desc, code)
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local cheat = { desc = desc, space = { cpup = { tag = ":maincpu", type = "program" } } }
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code = code:gsub("[: %-]", "")
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if #code ~= 8 then
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error("error action replay cheat incorrect length " .. desc)
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end
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local newval = tonumber(code:sub(7, 8), 16)
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local addr = tonumber(code:sub(3, 6), 16)
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if not newval or not addr then
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error("error parsing action replay cheat " .. desc)
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end
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cheat.script = { run = "cpup:write_u8(" .. addr .. "," .. newval .. ", true)" }
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return cheat
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end
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function codefuncs.snes_gg(desc, code)
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local xlate = { D = 0, F = 1, ["4"] = 2, ["7"] = 3, ["0"] = 4, ["9"] = 5, ["1"] = 6, ["5"] = 7,
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["6"] = 8, B = 9, C = 10, ["8"] = 11, A = 12, ["2"] = 13, ["3"] = 14, E = 15 }
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local value = 0
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local count = 0
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local cheat = { desc = desc, region = { rom = ":snsslot:cart:rom" } }
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cheat.script = { off = "if on then rom:write_u8(addr, save) end" }
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code:upper():gsub("(.)", function(s)
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if s == "-" then
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return
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elseif not xlate[s] then
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error("error parsing game genie cheat " .. desc)
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end
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count = count + 1
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value = (value << 4) | xlate[s]
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end)
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if count ~= 8 then
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error("error game genie cheat incorrect length " .. desc)
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end
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local newval = (value >> 24) & 0xff
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local addr = ((value >> 6) & 0xf) | ((value >> 12) & 0xf0) | ((value >> 6) & 0x300) | ((value << 10) & 0xc00) |
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((value >> 8) & 0xf000) | ((value << 14) & 0xf0000) | ((value << 10) & 0xf00000)
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if (manager:machine().devices[":maincpu"].spaces["program"]:read_u8(0xffd5) & 1) == 1 then --hirom
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local bank = addr >> 16
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local offset = addr & 0xffff
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if (bank & 0x7f) <= 0x3f and offset >= 0x8000 then
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-- direct map
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elseif (bank & 0x7f) >= 0x40 and (bank & 0x7f) <= 0x7d then
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addr = addr & 0x3fffff
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elseif bank >= 0xfe then
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addr = addr & 0x3fffff
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else
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error("error game genie cheat not rom addr " .. desc)
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end
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else --lorom
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local bank = addr >> 16
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local offset = addr & 0xffff
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if (bank & 0x7f) <= 0x3f and offset >= 0x8000 then
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addr = ((addr >> 1) & 0x78000) | (addr & 0x7fff)
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elseif (bank & 0x7f) >= 0x40 and (bank & 0x7f) <= 0x6f then
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addr = ((addr >> 1) & 0x78000) | (addr & 0x7fff)
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elseif (bank & 0x7f) >= 0x70 and (bank & 0x7f) <= 0x7d and offset >= 0x8000 then
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addr = ((addr >> 1) & 0x78000) | (addr & 0x7fff)
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elseif bank >= 0xfe and offset >= 0x8000 then
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addr = ((addr >> 1) & 0x78000) | (addr & 0x7fff)
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else
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error("error game genie cheat not rom addr " .. desc)
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end
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end
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cheat.script.on = string.format([[
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addr = %d
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save = rom:read_u8(addr)
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on = true
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rom:write_u8(addr, %d)
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]], addr, newval)
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return cheat
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end
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function codefuncs.megadriv_gg(desc, code)
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local xlate = { A = 0, B = 1, C = 2, D = 3, E = 4, F = 5, G = 6, H = 7, J = 8, K = 9, L = 10, M = 11, N = 12,
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P = 13, R = 14, S = 15, T = 16, V = 17, W = 18, X = 19, Y = 20, Z = 21, ["0"] = 22, ["1"] = 23,
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["2"] = 24, ["3"] = 25, ["4"] = 26, ["5"] = 27, ["6"] = 28, ["7"] = 29, ["8"] = 30, ["9"] = 31 }
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local value = 0
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local count = 0
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local cheat = { desc = desc, region = { rom = ":mdslot:cart:rom" } }
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cheat.script = { off = "if on then rom:write_u16(addr, save) end" }
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code:upper():gsub("(.)", function(s)
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if s == "-" then
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return
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elseif not xlate[s] then
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error("error parsing game genie cheat " .. desc)
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end
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count = count + 1
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value = (value << 5) | xlate[s]
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end)
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if count ~= 8 then
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error("error game genie cheat incorrect length " .. desc)
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end
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local newval = ((value >> 32) & 0xff) | ((value >> 3) & 0x1f00) | ((value << 5) & 0xe000)
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local addr = (value & 0xff00ff) | ((value >> 16) & 0xff00)
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cheat.script.on = string.format([[
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addr = %d
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save = rom:read_u16(addr)
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on = true
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rom:write_u16(addr, %d)
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]], addr, newval)
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return cheat
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end
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local function gbgg_ggcodes(desc, code, region)
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local cheat = { desc = desc, region = { rom = region } }
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cheat.script = { off = "if on then rom:write_u16(addr, save) end" }
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code = code:gsub("%-", "")
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local comp
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if #code == 6 then
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comp = -1
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elseif #code == 9 then
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comp = ~tonumber(code:sub(7, 7) .. code:sub(9, 9), 16) & 0xff
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comp = ((comp >> 2) | ((comp << 6) & 0xc0)) ~ 0x45
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else
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error("error game genie cheat incorrect length " .. desc)
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end
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local newval = tonumber(code:sub(1, 2), 16)
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local addr = tonumber(code:sub(6, 6) .. code:sub(3, 5), 16)
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if not newval or not addr or not comp then
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error("error parsing game genie cheat " .. desc)
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end
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addr = (~addr & 0xf000) | (addr & 0xfff)
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if addr > 0x7fff then
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error("error game genie cheat bad addr " .. desc)
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end
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if comp == -1 then
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cheat.script.on = string.format([[
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addr = %d
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save = rom:read_u8(addr)
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on = true
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rom:write_u8(addr, %d)
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]], addr, newval)
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else
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-- assume 8K banks
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cheat.script.on = string.format([[
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addr = %d
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save = %d
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for i = 0, rom.size, 8192 do
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if rom:read_u8(i + addr) == save then
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on = true
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addr = i + addr
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rom:write_u8(addr, %d)
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break
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end
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end]], addr & 0x3fff, comp, newval)
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end
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return cheat
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end
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function codefuncs.gameboy_gg(desc, code)
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return gbgg_ggcodes(desc, code, ":gbslot:cart:rom")
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end
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function codefuncs.gamegear_gg(desc, code)
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return gbgg_ggcodes(desc, code, ":slot:cart:rom")
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end
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function simple.conv_cheat(data)
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local cheats = {}
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for line in data:gmatch('([^\n;]+)') do
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local set, cputag, offset, size, val, desc = line:match('([^,]+),([^,]+),([^,]+),?([^,]*),?([^,]*),(.*)')
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if set == simple.romset then
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local cheat
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if cputag.sub(1,1) ~= ":" then
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local list, name = set:match('([^/]+)/(.+)')
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local func = list .. "_" .. cputag
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if list and desc and codefuncs[func] then
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local status
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status, cheat = pcall(codefuncs[func], desc, offset)
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if not status then
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emu.print_error(cheat)
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cheat = nil
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end
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end
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elseif size and val then
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cheat = { desc = desc, space = { cpup = { tag = cputag, type = "program" } } }
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if size == "w" then
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size = "u16"
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elseif size == "d" then
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size = "u32"
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elseif size == "q" then
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size = "u64"
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else
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size = "u8"
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end
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cheat.script = { run = "cpup:write_" .. size .. "(0x" .. offset .. ",0x" .. val .. ", true)" }
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end
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if cheat then
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cheats[#cheats + 1] = cheat
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end
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end
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end
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return cheats
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end
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return simple
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