A tool for quickly getting an idea for whether directories of large files have the same contents. This is similar to the much more rigorous hashdeep, though is much faster for large files.

The primary speedup vs related tools comes from not actually checking the full content of each file, so it can only give a general idea about changes. This is an acceptable trade-off where file integrity is not an issue and where file diversity is large.

The original use-case was for coping with directories of video files which might have been moved or renamed, but which were unlikely to actually change.

Very minimal tests exist via the ./runtests script. This operates on some dummy data files and directories within tests/ and can be configured to use either the Python or Rust implementations.

Python:

./runtests ./fast-hashdeep.py

Rust:

./runtests cargo run --release --