CRC-manipulator

A tool that lets you reverse and freely change CRC checksums through smart file patching.

Note

This repository is no longer maintained. The focus has shifted to a Python variant of this tool (the performance is equivalent).

Features

• Patching and calculating CRC checksums for:
  • CRC32
  • CRC32POSIX (cksum from GNU coreutils)
  • CRC16CCITT
  • CRC16IBM
• Available for GNU/Linux and Windows.
• Minimal GUI (supports CRC32 only; for more advanced options, use CLI version).

How it works

It appends a few bytes at the end of the file so that the file checksum computes to given hexadecimal hash.

Seeing it in action

GUI version:

CLI version:

Binaries for Windows

To download precompiled binaries for Windows, head over to releases.

Compiling

1. Make sure you have g++ python3-setuptools and python3-wheel packages installed

2. Install Meson and Ninja

   pip3 install meson ninja

3. Run following

   meson build --buildtype release
   ninja -C build

   The crcmanip-gui is not compiled by default. If you want to compile it, make sure you have qt5 packages installed. Then replace the third step above with this one:

   meson build -Dgui=true --buildtype release
   ninja -C build

Cross-compiling for Windows without GUI

1. Install mingw-w64

2. Replace the content of the cross_mingw_i686.txt and cross_mingw_x86_64.txt files with the one of the mingw-w64 files that you can find here

3. Build the binaries

   Windows 32-bit

   meson build_windows32 \
       --buildtype release \
       --cross-file cross_mingw_i686.txt
   ninja -C build_windows32

   Windows 64-bit

   meson build_windows64 \
       --buildtype release \
       --cross-file cross_mingw_x86_64.txt
   ninja -C build_windows64

Cross-compiling for Windows with GUI

1. Install mxe

2. Add the mxe path to the environment variable PATH

3. Install the static version of the qt5 library

   Windows 32-bit

   cd your/path/to/mxe/
   make MXE_TARGETS=i686-w64-mingw32.static qt5

   Windows 64-bit

   cd your/path/to/mxe/
   make MXE_TARGETS=x86_64-w64-mingw32.static qt5

4. Build the binaries

   Windows 32-bit

   meson build_windows32 \
       --buildtype release \
       -Dgui=true \
       -Dmxe='/your/path/to/mxe/32-bit' \
       --cross-file cross_mingw_i686.txt
   ninja -C build_windows32

   Windows 64-bit

   meson build_windows64 \
       --buildtype release \
       -Dgui=true \
       -Dmxe='/your/path/to/mxe/64-bit' \
       --cross-file cross_mingw_x86_64.txt
   ninja -C build_windows64

Building tests

To build tests, simply add the -Dtests=true option to the meson command.