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Copy pathmemscan.lua
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518 lines (450 loc) · 14.2 KB
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-- Utilities for offset scan scripts.
local _ENV = mkmodule('memscan')
local utils = require('utils')
-- A length-checked view on a memory buffer
CheckedArray = CheckedArray or {}
function CheckedArray.new(type,saddr,eaddr)
local data = df.reinterpret_cast(type,saddr)
local esize = data:sizeof()
local count = math.floor((eaddr-saddr)/esize)
local obj = {
type = type, start = saddr, size = count*esize,
esize = esize, data = data, count = count
}
setmetatable(obj, CheckedArray)
return obj
end
function CheckedArray:__len()
return self.count
end
function CheckedArray:__index(idx)
if type(idx) == "number" then
if idx >= self.count then
error('Index out of bounds: '..tostring(idx))
end
return self.data[idx]
else
return CheckedArray[idx]
end
end
function CheckedArray:__newindex(idx, val)
if idx >= self.count then
error('Index out of bounds: '..tostring(idx))
end
self.data[idx] = val
end
function CheckedArray:addr2idx(addr, round)
local off = addr - self.start
if off >= 0 and off < self.size and (round or (off % self.esize) == 0) then
return math.floor(off / self.esize), off
end
end
function CheckedArray:idx2addr(idx)
if idx >= 0 and idx < self.count then
return self.start + idx*self.esize
end
end
-- Search methods
function CheckedArray:find(data,sidx,eidx,reverse)
local dcnt = #data
sidx = math.max(0, sidx or 0)
eidx = math.min(self.count, eidx or self.count)
if (eidx - sidx) >= dcnt and dcnt > 0 then
return dfhack.with_temp_object(
df.new(self.type, dcnt),
function(buffer)
for i = 1,dcnt do
buffer[i-1] = data[i]
end
local cnt = eidx - sidx - dcnt
local step = self.esize
local sptr = self.start + sidx*step
local ksize = dcnt*step
if reverse then
local idx, addr = dfhack.internal.memscan(sptr + cnt*step, cnt, -step, buffer, ksize)
if idx then
return sidx + cnt - idx, addr
end
else
local idx, addr = dfhack.internal.memscan(sptr, cnt, step, buffer, ksize)
if idx then
return sidx + idx, addr
end
end
end
)
end
end
function CheckedArray:find_one(data,sidx,eidx,reverse)
local idx, addr = self:find(data,sidx,eidx,reverse)
if idx then
-- Verify this is the only match
if reverse then
eidx = idx+#data-1
else
sidx = idx+1
end
if self:find(data,sidx,eidx,reverse) then
return nil
end
end
return idx, addr
end
function CheckedArray:list_changes(old_arr,old_val,new_val,delta)
if old_arr.type ~= self.type or old_arr.count ~= self.count then
error('Incompatible arrays')
end
local eidx = self.count
local optr = old_arr.start
local nptr = self.start
local esize = self.esize
local rv
local sidx = 0
while true do
local idx = dfhack.internal.diffscan(optr, nptr, sidx, eidx, esize, old_val, new_val, delta)
if not idx then
break
end
rv = rv or {}
rv[#rv+1] = idx
sidx = idx+1
end
return rv
end
function CheckedArray:filter_changes(prev_list,old_arr,old_val,new_val,delta)
if old_arr.type ~= self.type or old_arr.count ~= self.count then
error('Incompatible arrays')
end
local eidx = self.count
local optr = old_arr.start
local nptr = self.start
local esize = self.esize
local rv
for i=1,#prev_list do
local idx = prev_list[i]
if idx < 0 or idx >= eidx then
error('Index out of bounds: '..idx)
end
if dfhack.internal.diffscan(optr, nptr, idx, idx+1, esize, old_val, new_val, delta) then
rv = rv or {}
rv[#rv+1] = idx
end
end
return rv
end
-- A raw memory area class
MemoryArea = MemoryArea or {}
MemoryArea.__index = MemoryArea
function MemoryArea.new(astart, aend)
local obj = {
start_addr = astart, end_addr = aend, size = aend - astart,
int8_t = CheckedArray.new('int8_t',astart,aend),
uint8_t = CheckedArray.new('uint8_t',astart,aend),
int16_t = CheckedArray.new('int16_t',astart,aend),
uint16_t = CheckedArray.new('uint16_t',astart,aend),
int32_t = CheckedArray.new('int32_t',astart,aend),
uint32_t = CheckedArray.new('uint32_t',astart,aend),
float = CheckedArray.new('float',astart,aend)
}
setmetatable(obj, MemoryArea)
return obj
end
function MemoryArea:__gc()
df.delete(self.buffer)
end
function MemoryArea:__tostring()
return string.format('<MemoryArea: %x..%x>', self.start_addr, self.end_addr)
end
function MemoryArea:contains_range(start,size)
return size >= 0 and start >= self.start_addr and (start+size) <= self.end_addr
end
function MemoryArea:contains_obj(obj,count)
local size, base = df.sizeof(obj)
return size and base and self:contains_range(base, size*(count or 1))
end
function MemoryArea:clone()
local buffer = df.new('int8_t', self.size)
local _, base = buffer:sizeof()
local rv = MemoryArea.new(base, base+self.size)
rv.buffer = buffer
return rv
end
function MemoryArea:copy_from(area2)
if area2.size ~= self.size then
error('Size mismatch')
end
dfhack.internal.memmove(self.start_addr, area2.start_addr, self.size)
end
function MemoryArea:delete()
setmetatable(self, nil)
df.delete(self.buffer)
for k,v in pairs(self) do self[k] = nil end
end
-- Static code segment search
function get_code_segment()
local cstart, cend
for i,mem in ipairs(dfhack.internal.getMemRanges()) do
if mem.read and mem.execute
and (string.match(mem.name,'/dwarfort%.exe$')
or string.match(mem.name,'/Dwarf_Fortress$')
or string.match(mem.name,'Dwarf Fortress%.exe'))
then
cstart = mem.start_addr
cend = mem.end_addr
end
end
if cstart and cend then
return MemoryArea.new(cstart, cend)
end
end
-- Static data segment search
local function find_data_segment()
local data_start, data_end
for i,mem in ipairs(dfhack.internal.getMemRanges()) do
if data_end then
if mem.start_addr == data_end and mem.read and mem.write then
data_end = mem.end_addr
else
break
end
elseif mem.read and mem.write
and (string.match(mem.name,'/dwarfort%.exe$')
or string.match(mem.name,'/Dwarf_Fortress$')
or string.match(mem.name,'Dwarf Fortress%.exe'))
then
data_start = mem.start_addr
data_end = mem.end_addr
end
end
return data_start, data_end
end
function get_data_segment()
local s, e = find_data_segment()
if s and e then
return MemoryArea.new(s, e)
end
end
-- Register a found offset, or report an error.
function found_offset(name,val)
local cval = dfhack.internal.getAddress(name)
if not val then
print('Could not find offset '..name)
if not cval and not utils.prompt_yes_no('Continue with the script?') then
qerror('User quit')
end
return
end
if df.isvalid(val) then
_,val = val:sizeof()
end
print(string.format('Found offset %s: %x', name, val))
if cval then
if cval ~= val then
error(string.format('Mismatch with the current value: %x != %x',val,cval))
end
else
dfhack.internal.setAddress(name, val)
local ival = val - dfhack.internal.getRebaseDelta()
local entry = string.format("<global-address name='%s' value='0x%x'/>\n", name, ival)
local ccolor = dfhack.color(COLOR_LIGHTGREEN)
dfhack.print(entry)
dfhack.color(ccolor)
io.stdout:write(entry)
io.stdout:flush()
end
end
-- Offset of a field within struct
function field_ref(handle,...)
local items = table.pack(...)
for i=1,items.n-1 do
handle = handle[items[i]]
end
return handle:_field(items[items.n])
end
function field_offset(type,...)
local handle = df.reinterpret_cast(type,1)
local _,addr = df.sizeof(field_ref(handle,...))
return addr-1
end
function MemoryArea:object_by_field(addr,type,...)
if not addr then
return nil
end
local base = addr - field_offset(type,...)
local obj = df.reinterpret_cast(type, base)
if not self:contains_obj(obj) then
obj = nil
end
return obj, base
end
-- Validation
function is_valid_vector(ref,size)
local ints = df.reinterpret_cast('uint32_t', ref)
return ints[0] <= ints[1] and ints[1] <= ints[2]
and (size == nil or (ints[1] - ints[0]) % size == 0)
end
-- Difference search helper
DiffSearcher = DiffSearcher or {}
DiffSearcher.__index = DiffSearcher
function DiffSearcher.new(area)
local obj = { area = area }
setmetatable(obj, DiffSearcher)
return obj
end
function DiffSearcher:begin_search(type)
self.type = type
self.old_value = nil
self.search_sets = nil
if not self.save_area then
self.save_area = self.area:clone()
end
end
function DiffSearcher:advance_search(new_value,delta)
if self.search_sets then
local nsets = #self.search_sets
local ovec = self.save_area[self.type]
local nvec = self.area[self.type]
local new_set
if nsets > 0 then
local last_set = self.search_sets[nsets]
new_set = nvec:filter_changes(last_set,ovec,self.old_value,new_value,delta)
else
new_set = nvec:list_changes(ovec,self.old_value,new_value,delta)
end
if new_set then
self.search_sets[nsets+1] = new_set
self.old_value = new_value
self.save_area:copy_from(self.area)
return #new_set, new_set
end
else
self.old_value = new_value
self.search_sets = {}
self.save_area:copy_from(self.area)
return #self.save_area[self.type], nil
end
end
function DiffSearcher:reset()
self.search_sets = nil
if self.save_area then
self.save_area:delete()
self.save_area = nil
end
end
function DiffSearcher:idx2addr(idx)
return self.area[self.type]:idx2addr(idx)
end
-- Interactive search utility
function DiffSearcher:find_interactive(prompt,data_type,condition_cb,iter_limit)
enum = enum or {}
-- Loop for restarting search from scratch
while true do
print('\n'..prompt)
self:begin_search(data_type)
local found = false
local ccursor = 0
-- Loop through choices
while true do
print('')
if iter_limit and ccursor >= iter_limit then
dfhack.printerr(' Iteration limit reached without a solution.')
break
end
local ok, value, delta = condition_cb(ccursor)
ccursor = ccursor + 1
if not ok then
break
end
-- Search for it in the memory
local cnt, set = self:advance_search(value, delta)
if not cnt then
dfhack.printerr(' Converged to zero candidates; probably a mistake somewhere.')
break
elseif set and cnt == 1 then
-- To confirm, wait for two 1-candidate results in a row
if found then
local addr = self:idx2addr(set[1])
print(string.format(' Confirmed address: %x\n', addr))
return addr, set[1]
else
found = true
end
end
print(' '..cnt..' candidates remaining.')
end
if not utils.prompt_yes_no('\nRetry search from the start?') then
return nil
end
end
end
function DiffSearcher:find_menu_cursor(prompt,data_type,choices,enum)
enum = enum or {}
return self:find_interactive(
prompt, data_type,
function(ccursor)
local choice
-- Select the next value to search for
if type(choices) == 'function' then
choice = choices(ccursor)
if not choice then
return false
end
else
choice = choices[(ccursor % #choices) + 1]
end
-- Ask the user to select it
if enum ~= 'noprompt' then
local cname = enum[choice] or choice
if type(choice) == 'string' and type(cname) == 'number' then
choice, cname = cname, choice
end
if cname ~= choice then
cname = cname..' ('..choice..')'
end
print(' Please select: '..cname)
if not utils.prompt_yes_no(' Continue?', true) then
return false
end
end
return true, choice
end
)
end
function DiffSearcher:find_counter(prompt,data_type,delta,action_prompt)
delta = delta or 1
return self:find_interactive(
prompt, data_type,
function(ccursor)
if ccursor > 0 then
print(" "..(action_prompt or 'Please do the action.'))
end
if not utils.prompt_yes_no(' Continue?', true) then
return false
end
return true, nil, delta
end
)
end
-- Screen size
function get_screen_size()
-- Use already known globals
if dfhack.internal.getAddress('init') then
local d = df.global.init.display
return d.grid_x, d.grid_y
end
if dfhack.internal.getAddress('gps') then
local g = df.global.gps
return g.dimx, g.dimy
end
-- Parse stdout.log for resize notifications
io.stdout:flush()
local w,h = 80,25
for line in io.lines('stdout.log') do
local cw, ch = string.match(line, '^Resizing grid to (%d+)x(%d+)$')
if cw and ch then
w, h = tonumber(cw), tonumber(ch)
end
end
return w,h
end
return _ENV
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