-b : Outputs only the offsets where compressed data was found without actually writing the extracted files to disk. Useful for quick inspection.
: -m zlib or -m deflate to match the target's original compression type. Why Use These Instead of 7-Zip or WinRAR?
), edit them with a hex editor, and then re-compress them to unlock items or change stats. ROM Hacking Offzip Exe And Packzip Exe
offzip -S input_file.dat 0 0 This scans the entire file and lists the offsets and sizes of any zlib streams found.
Extracts compressed data from game files, executables, and libraries. -b : Outputs only the offsets where compressed
| Task | Command | |------|---------| | Extract all streams | offzip -a input.bin out_dir 0 | | Extract from offset 0x1000 | offzip -o 0x1000 input.bin out_file.dat | | Recompress single file | packzip raw.dat compressed.bin | | Check for Zlib header | Hex search: 78 01 , 78 9C , 78 DA |
Offzip has also been used to extract configuration files from routers such as the ZTE ZXHN H118N. By using Offzip on the config.bin file, users can obtain decrypted .dat files containing administrator credentials: Why Use These Instead of 7-Zip or WinRAR
Data compression is a fundamental part of modern software development, especially in video game design. Developers frequently use the zlib compression library to shrink asset files, reduce loading times, and save storage space. However, for modders, data analysts, and reverse engineers, these compressed files act as a barrier to accessing the underlying data.
