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shenhuyong

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Posts posted by shenhuyong

  2. Posted

    LuaDec for Lua 5.1.4 is a Lua decompiler targeting lua versions 5.1.4

    It is based on Hisham Muhammad's luadec which targeted lua 5.0.x (http://luadec.luaforge.net/)

     

     

    About Hisham Muhammad's LuaDec

     

    LuaDec is a decompiler for the Lua language. It takes compiled Lua bytecodes and attempts to produce equivalent Lua source code on standard output. It targets Lua 5.0.2.

     

    LuaDec is written by Hisham Muhammad, and is licensed under the same terms as Lua. Windows binaries contributed by Fábio Mascarenhas.

     

    Description

     

    The decompiler performs two passes. The first pass is considered a "preliminary pass". Only two actions are performed: addresses of backward jumps are gathered for while constructs, and variables referenced by CLOSE instructions are taken note of in order to identify the point where explicit do blocks should be opened.

     

    The actual decompilation takes place in the second, "main pass". In this pass, the instructions are symbolically interpreted. As functions are traversed recursively, the symbolic content of registers are kept track of, as well as a few additional data structures: two register stacks, one for "variable registers" (registers currently allocated for variables) one for "temporary registers" (registers holding temporary values); and a list of boolean conditions.

     

    Instructions like ADD and MOVE combine the string representation of symbols and move them around in registers. Emission of actual statements is delayed until the temporaries stack is empty, so that constructs like a,b=b,a are processed correctly.

     

    The list of boolean conditions accumulate pairs of relational operators (or TESTs and jumps). The translation of a list into a boolean expression is done in three stages. In the first stage, jump addresses are checked to identify "then" and "else" addresses and to break the list into smaller lists in the case of nested if statements. In the second stage, the relations between the jumps is analyzed serially to devise a parenthization scheme. In the third scheme, taking into account the parenthization and an 'inversion' flag (used to tell "jump-if-true" from "jump-if-false" expressions), the expression is printed, recursively.

     

    Two forms of "backpatching" are used in the main processing pass: boolean conditions for while constructs are inserted in the marked addresses (as noted in the first pass), and do blocks are added as necessary, according to the liveness information of local variables.

     

    Status

     

    LuaDec, in its current form, is not a complete decompiler. It does succeed in decompiling most of the Lua constructs, so it could be used as a tool to aid in retrieving lost sources.

     

    The situations where LuaDec "get it wrong" are usually related to deciding whether a sequence of relational constructs including TEST operators are part of an assignment or an if construct. Also, the "single pass" nature of the symbolic interpreter fails at some corner cases where there simply is not enough information in the sequence of operator/jump pairs to identify what are the "then" and "else" addresses. This is an example of such a case:

     

    1 [2] LOADNIL 0 2 0

    2 [3] JMP 0 16 ; to 19

    3 [4] EQ 0 1 250 ; - 2

    4 [4] JMP 0 2 ; to 7

    5 [4] TEST 2 2 1

    6 [4] JMP 0 5 ; to 12

    7 [4] EQ 0 1 251 ; - 3

    8 [4] JMP 0 3 ; to 12

    9 [4] LOADK 3 2 ; 1

    10 [4] TEST 3 3 1

    11 [4] JMP 0 0 ; to 12

    12 [6] LOADK 0 2 ; 1

    13 [7] JMP 0 7 ; to 21

    14 [8] LOADK 0 0 ; 2

    15 [8] JMP 0 3 ; to 19

    16 [10] LOADK 0 1 ; 3

    17 [11] JMP 0 3 ; to 21

    18 [12] LOADK 0 4 ; 4

    19 [3] TEST 1 1 1

    20 [3] JMP 0 -18 ; to 3

    21 [14] RETURN 0 1 0

     

    local a, x, y

    while x do

    if ((x==2) and y) or ((x==3) and 1) or 0

    then

    a = 1

    do break end

    a = 2

    else

    a = 3

    do break end

    a = 4

    end

    a = 5

    end

     

     

     

    Notice that there is no reference to the "else" address in the highlighted sequence. Only with a more sophisticated block analysis it would be possible to identify the varying purposes of the JMP instructions at addresses 13, 15 and 17.

     

    For illustrational purposes, here are the results of running LuaDec on the bytecodes generated by the Lua demos included in the test/ subdirectory of the official Lua distribution, as of version 0.4.

    •bisect.lua - works

    •cf.lua - works

    •echo.lua - works

    •env.lua - works

    •factorial.lua - works

    •fibfor.lua - works

    •fib.lua - works

    •globals.lua - works

    •hello.lua - works

    •life.lua - works

    •luac.lua - works

    •printf.lua - works

    •readonly.lua - works

    •sieve.lua - works

    •sort.lua - works

    •table.lua - works

    •trace-calls.lua - fails assertion works (fixed in 0.4)

    •trace-globals.lua - works

    •undefined.lua - works

    •xd.lua - works

     

    Running it

     

    To try out LuaDec:

    make

    bin/luac test/life.lua

    bin/luadec luac.out > newlife.lua

    bin/lua newlife.lua

     

     

    LuaDec includes a -d flag, which displays the progress of the symbolic interpretation: for each bytecode, the variable stacks and the code generated so far are shown.

     

    Operation modes

     

    In its default operation mode, LuaDec recursively processes the program functions, starting from the outmost chunk ("main"). When LuaDec detects a decompilation error (by doing sanity checks on its internal data structures), Luadec outputs the portion of the function decompiled so far, and resumes decompilation in the outer closure.

     

    There is an alternative operation mode, set with the -f flag, where all functions are decompiled separately. This does not generate a .lua file structured like the original program, but it is useful in the cases where a decompilation error makes a closure declaration "unreachable" in the default operation mode. This allows a larger portion of the sources to be restored in the event of errors.

  3. Posted · Edited by shenhuyong

    Hello everyone, now we can decompile 5.1.4 lub files to lua file by ourslaves.

    LuaDec for Lua 5.1.4, it's a easy and super powerful Lub->Lua decompiler, and it's a offline tool not like this one http://herc.ws/board/topic/2241-lub-lua-decompilernow-online/.

     

    step 1: Copy you lub file to the root directory.

    step 2: Using the notepad to edit “RUN ME.bat”, change the lub file's name as you copyied

    example: luadec accessoryid.lub > accessoryid.lua

    step 3: Save “RUN ME.bat” and close the notepad, run “RUN ME.bat”, you can find a decompiled lua file appear in the root directory.

     

    Download link:

    http://herc.ws/board/files/file/52-luadec-for-lua-514-a-easy-and-super-powerful-lub-lua-decompiler/

     

    Source code:

    http://code.google.com/p/luadec/

    Litro, themon and Aethelingaeg reacted to this

  8. Posted · Edited by shenhuyong

    Hello everybody,

     

    We've support for the Rebellion now!

    I have pull a request to hercules GIT, you can see the code here.

    https://github.com/HerculesWS/Hercules/pull/161

     

    Added full support for the Rebellion

    Credits to 3ceam2 for the base,Thanks to Rytech.

    -The skill still needs to be completed, as well as support for higher base stats.

    -Bonus stats are set to temporarily values until the official ones are known.

    -Updated the item_db.txt file with information on the Rebellion's job equip mask.

    -Added packets and packet keys for 2013-08-07Ragexe with the info provided by Shakto,Thanks to Shakto.

    -A 2013-08-07Ragexe client or higher is required for this job to be properly playable.

     

    And you can see the translated lub files here.

    https://subversion.assembla.com/svn/client-side-translation/

     

    Enjoy it, This is my Chinese translated screenshot.

     

    screen56FD738B4E4B8C37PvP011.jpg

    Neo-Mind, Valor and Slowpoker reacted to this

  10. Posted · Edited by shenhuyong

     

     

    MEGA UPDATE:

    Restore Login Window & Disable 1rag1 Patches are now fixed (well i haven't seen any errors so far).

     

    Please download the updated xdiff from the repository link above.

     

    I tested 2013-06-05 and 2013-08-07, 2013-06-05 works fine,but 2013-08-07 seems have some wrong msg.

     

    For example, the title of server selection window, it display "Possible escape area."(line 2084 from msgstringtable.txt), but it should be "Select Service:"(line 2083 from msgstringtable.txt).

     

    And I press the "join" button on Login Window, the client will crash.

     

    >>hmm ok will take a look at that.

     

    EDIT: FYI new clients are taking different lines from msgstringtable.txt for strings (my Inventory became large because of it :| )

     

    I found the line on msgstringtable.txt that is mismatching on 2013-08-07

    Between:

    You cannot use this item with your current level.#
    and
    Enable Battlemode#
    I put something like:
    mydebugmsg#
    And everything I tested was back to normal. Not sure if bugged something, but I'm almost sure it is this message that is missing.
     
     
    @edit
    Also, can anyone help me here?
    I got the packet for the new bank system, but it is not available.
    Anyone knows in which version the bank system might be available? I'm using 2013-08-07

     

     

    I solved it. I extracted msgstringtable.txt from the latest Chinese client, I found they added a line on line 1749.

    Between:

    %s item could not be sold because you do not have the wanted amount of items.#

    and

    You don't have any summoned spirits.#

    add (I translated it from Chinese)

    What is this?#

    Then everything all right.

     

    And the bank system is not available on hercules, kRO added it on 2013-07-24. We still have not any code about bank system in the source.

  11. Posted

    MEGA UPDATE:

    Restore Login Window & Disable 1rag1 Patches are now fixed (well i haven't seen any errors so far).

     

    Please download the updated xdiff from the repository link above.

     

    I tested 2013-06-05 and 2013-08-07, 2013-06-05 works fine,but 2013-08-07 seems have some wrong msg.

     

    For example, the title of server selection window, it display "Possible escape area."(line 2084 from msgstringtable.txt), but it should be "Select Service:"(line 2083 from msgstringtable.txt).

     

    And I press the "join" button on Login Window, the client will crash.

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