ScrapHacks/NOTES.md

Infos

• Engine: ScrapEngine
• Ingame Scripting Language: Python 1.5.2

Functions identified:

Ingame-Console (Ctrl+^ or right click on titlebar and select "switch console") (Handler@0x402190):

• <Command>: Try to evaluate Command as Python expression
• :<Var>: Get Game Engine Global Variable
• :<Var> <Val>: Set Game Engine Global Variable
• ?: Show all Global Variable
• ?<String>: Show all Global Variable matching <String>
• /<command>: Run Command defined in QuickConsole.py: import quickconsole;quickconsole.%s()
• /<command> <arg>,<arg>: Run function in QuickConsole.py with argument(s) import quickconsole;quickconsole.%s(%s)

External Console (Scenegraph Debugging?) (Handler@0x5f9520):

• listar luces
• listar
• arbol (Patch Scrap.exe@offset 0x314bc9 replace 0x20 with 0x00 (or just type arbol with a space at the end))
• mem
• ver uniones
• Easter Eggs:
  • imbecil
  • idiota
  • capullo

Python Stuff

• Modules List @ 0x79C698 (Module Name as char* followed by Pointer to Init Function)
• InitPyMod @ 0x5A8FB0
• PyExec @ 0x5A8390

Other Functions:

• FindEntity @ 0x404a50
• HashTable hashfunc @ 0x404bb0
• Register C Callback @ 0x404460
• Load Game @ 0x417470
• File opening functions @ 0x5e3800 and 0x419950
• Scrap_Debug_Init @ 0x403370
• Scrap_Init @ 0x401770
• Scrap_InitPy @ 0x4026d0
• Scrap_OpenPak @ 0x41ab50
• PyExec @ 0x5a8390
• Setup_Game_Var @ 0x414570
• Throw_Assertion @ 0x5fbc50
• m3d.ini loader @ 0x5f7000
• SM3 Scene Loader @ 0x650f80 (?)
• M3D Model Loader @ 0x6665a0 (??)
• World_Constructor @ 0x479b20 (???)
• World_Init @ 0x479b40
• World_DeInit @ 0x402510
• Make_World @ 0x479870

Data Structures

Game World/State Pointer @ 0x7fe944

Points to World struct

Offset	Type	Description
0x0000	void**	Virtual Method Table
0x0004	uint32_t	Size of Entity Hashtable
0x0008	void**	Pointer to Entity Hashtable
0x02B8	uint32_t	Number of entity lists
0x02BC	void**	Pointer to entity list Hashtable
0x0330	float[3]	Time (why 3 times?)
0x1C6C	float	Alarm level
0x1C68	float	Alarm Grow Level
0x2158	float	Used in World_Init
0x2170	???	Used in World_Init
0x2180	float	Used in World_Init
0x2188	void*	Used in World_Init
0x218C	void*	Used in World_Init
0x2190	float	Used in World_Init
0x2198	void*	Used in World_Init
0x219C	void*	Used in World_Init
0x21A0	void**	Used in World_Init (VTable pointer?)
0x21B4	void**	Used in World_Init (VTable pointer?)
0x21C8	???	Used in World_Init
0x2204	uint32_t or uint16_t	Used in World_Init
0x2230	float	Used in World_Init
0x2238	???	Used in World_Init
0x2254	float	Used in World_Init

Entity Hash Table

Hash-function used: PJW (Same parameters as the example implementation)

Entry format:

Offset	Type	Description
0x0	void*	Pointer to data
0x4	const char*	key as char*
0x8	void*	Pointer to next entry in chain

Data format:

Offset	Type	Description
0x0	void**	Virtual Method Table (?)
0x4	const char*	name as string
0x14	void*	pointer to self (why?)
0x28	float[3]	Position in Game World

Game Window Object (?) Pointer @ 0x7fa380

Offset	Type	Description
0x0000	void**	Virtual Method Table
0x0004	const char*	Some Model Name (?)
0x0008	void*	Pointer to something
0x000C	void*	Ditto

File Formats

.packed File Format:

Header:
    "BFPK\0\0\0\0"
    Int32ul: number of files
    for each file:
        Int32ul: path length
        String: path
        Int32ul: size
        Int32ul: offset in file

Loading Custom Content (not really working)

1. Create a folder mods
2. Drop a *.packed file into it
3. Change Scrap.cfg as follows
   1. Add ModPathName = mods
   2. Add ModFileName = <filename>

Interesting file:

• m3d.ini: Rendering Engine Configuration
• scripts/: Game Engine Scripts

How to enable External Console:

1. exctract Data.packed
2. in m3d.ini uncomment (remove ;) ConsolaWnd (GUI Console) and/or ConsolaTxt (Text Console) and set the value to SI
3. repack Data.packed

or right click on the title bar (in windowed mode) and click "Switch Console"

or Use a custom Content Pack (untested!)

Misc. Interesting things

• sys.path contains "./lib" so you can load your own Python Modules

Code Snippets

Kaitai Struct Parser for .packed files

meta:
  id: packed
  application: Scrapland
  file-extension: packed
  endian: le
  xref: http://wiki.xentax.com/index.php/Scrapland_PACKED
  license: MIT
  encoding: UTF-8
seq:
  - id: magic
    contents: BFPK
    doc: File Magic
  - id: magic2
    contents: [0,0,0,0]
    doc: Second File Magic
  - id: num_files
    type: u4
    doc: Number of files
  - id: files
    type: file_entry
    repeat: expr
    repeat-expr: num_files
    doc: Directory entry for each file
types:
  file_entry:
    seq:
      - id: path_len
        type: u4
        doc: Length of file path
      - id: path
        type: str
        size: path_len
        doc: File path
      - id: size
        type: u4
        doc: File size
      - id: offset
        type: u4
        doc: Absoulte File offset
    instances:
      data:
        pos: offset
        size: size

Hashfunction used in Entity Hash-Table

unsigned long ElfHash(const unsigned char *s)
{
    unsigned long h = 0, high;
    while ( *s )
    {
        h = ( h << 4 ) + *s++;
        if ( high = h & 0xF0000000 )
            h ^= high >> 24;
        h &= ~high;
    }
    return h;
}