GSC Tool

A utility to compile & decompile IW engine game scripts.

Supported Games

• IW5 (Call of Duty: Modern Warfare 3) PC PS3 Xbox 360
• IW6 (Call of Duty: Ghosts) PC PS3 PS4 Xbox 360 Xbox One
• IW7 (Call of Duty: Infinite Warfare) PC PS4 Xbox One
• IW8 (Call of Duty: Modern Warfare (2019) / Warzone) PC PS4 PS5 Xbox One Xbox Series X|S
• IW9 (Call of Duty: Modern Warfare II (2022) / Warzone 2) PC PS4 PS5 Xbox One Xbox Series X|S
• S1 (Call of Duty: Advanced Warfare) PC PS3 PS4 Xbox 360 Xbox One
• S2 (Call of Duty: WWII) PC PS4 Xbox One
• S4 (Call of Duty: Vanguard) PC PS4 PS5 Xbox One Xbox Series X|S
• H1 (Call of Duty: Modern Warfare Remastered) PC PS4 Xbox One
• H2 (Call of Duty: Modern Warfare 2 Campaign Remastered) PC PS4 PS5 Xbox One Xbox Series X|S
• T6 (Call of Duty: Black Ops II) PC PS3 Xbox 360 Wii U
• T7 (Call of Duty: Black Ops III) PC (Decompiler)
• T8 (Call of Duty: Black Ops 4) *WIP*
• T9 (Call of Duty: Black Ops Cold War) *WIP*
• T10 (Call of Duty: Black Ops 6) *WIP*
• JUP (Call of Duty: Modern Warfare III (2023) *WIP*

Usage

gsc-tool [OPTIONS..] <path>

• path: file or directory to process

• options:

  -m, --mode <mode> [REQUIRED] one of: asm, disasm, comp, decomp, parse

  -g, --game <game> [REQUIRED] one of: iw5, iw6, iw7, iw8, iw9, s1, s2, s4, h1, h2, t6 t7 t8 t9 jup

  -s, --system <system> [REQUIRED] one of: pc, ps3, ps4, ps5, xb2 (360), xb3 (One), xb4 (Series X|S), wiiu

  -i, --instance <instance> Instance to use on games with .gsc/.csc (server, client). (default: server)

  -w, --workdir <path> Working directory for includes or headers. (default: .)

  -y, --dry Dry run (do not write files).

  -d, --dev Enable developer mode (dev blocks & generate bytecode map).

  -z, --zonetool Enable zonetool mode (use .cgsc files).

  --t6fixup Decompile t6 files from broken compilers.

  -h, --help Display help.

  -v, --version Display version.

Example: gsc-tool -m comp -g iw5 -s pc ./data/iw5/my_fancy_script.gsc

Mode	Description	Output
asm	assemble a file.gscasm	file.gscbin
disasm	dissasemble a file.gscbin	file.gscasm
comp	compile a file.gsc	file.gscbin
decomp	decompile a file.gscbin	file.gsc
parse	parse a file.gsc	file.gsc

File Format

If you need to extract scripts from fastfiles or game memory, use Zonetool or Jekyll.

• gsc-tool .gscbin binary format is a serialized ScriptFile struct:
  

  • magic: "GSC\0" 4 byte
    
  • compressedLen: 4 byte usigned integer
    
  • len: 4 byte usigned integer
    
  • bytecodeLen: 4 byte usigned integer
    
  • buffer: byte array[compressedLen]
    
  • bytecode: byte array[bytecodeLen]
    

note: for PS3 & Xbox 360 .gscbin files (compressedLen, len, bytecodeLen) are saved as little-endian!!

• zonetool (IW5) format made of bytecode file .cgsc and decompressed stack buffer .cgsc.stack.

• treyarch (T6) format is a single buffer with gscobj data .gsc or .csc.

Build

• install premake5 on your system PATH
• clone this repository
• update the submodules git submodule update --init --recursive
• run prebuild script premake5 vs2022 (windows) or premake5 gmake2 (linux/macos)

Contribute

If you like my work, consider sponsoring/donating! Would allow me to spend more time adding new features & fixing bugs.

BTC: bc1qky7x9kpjlt6nsvt7pckc3wwzk8rk9pgtnmw98u

Credits

This project is based on RektInator's gsc-asm. Special thanks to RektInator, JTAG & Dasfonia.

Disclaimer

This software has been created purely for the purposes of academic research. Project maintainers are not responsible or liable for misuse of the software. Use responsibly.