vxZIP Decoder Architecture

• Decoders are ELF executables for x86-32

  • Can be written in any language, safe or unsafe
  • Compiled using ordinary tools (GCC)

• Decoders have access to five “system calls”:

  • read stdin, write stdout, malloc, next file, exit

• Decoders cannot:

  • open files, windows, devices, network connections, ...
  • get system info: user name, current time, OS type, ...