SWF decompilation tool, written for Castle Crashers

• Lexer
  • Main.swf opcodes
  • All opcodes
• Parser
  • To P-Code
  • To Actionscript
    • Expressions
    • If Else
    • If Else If
    • Ternary If Else
    • Switch case
    • While loop
    • Do While
    • Loop in loop
    • For loop
    • Arithmic precedence
    • String handling
    • Unknown byte handling
  • To Bytes
• Reading SWF
  • Code
  • Assets
  • Other
• Writing SWF
  • Code
  • Assets
  • Other
• Runtime
  • One file
  • Multiple files
• Fix Sly issues
  • WARNING: shift/reduce conflicts
  • spaces / newlines
  • DRY code

Doesn't actually accept SWF's just yet

$ python runtime.py {filename.swf}

P-Code

$ python runtime.py {filename.swf} --pcode

$ python -m unittest discover

Bytes in SWF

88 06 00 01 00 66 69 62 00 8e 0e 00 66 69 62 00 01 00 02 2a 00 01 6e 00 58 00 96 02 00 04 01 96 05 00 07 02 00 00 00 48 12 9d 02 00 0a 00 96 02 00 04 01 99 02 00 39 00 96 02 00 04 01 96 05 00 07 01 00 00 00 0b 96 05 00 07 01 00 00 00 96 02 00 08 00 3d 96 02 00 04 01 96 05 00 07 02 00 00 00 0b 96 05 00 07 01 00 00 00 96 02 00 08 00 3d 47 3e 00

Decompiled ActionScript

function fib(n)
{
  return n < 2 ? n : fib(n - 1) + fib(n - 2);
}

• https://docslib.org/doc/6003034/swf-file-format-specification-version-19
• http://www.doc.ic.ac.uk/lab/labman/swwf/SWFalexref.html