Hello CLJ

My latest clj stuff for random things.

The things

PHP mcrypt_rijndael_256 in Clojure

The actually working php rijndael 256 port to clojure for now is in me.php-mcrypt namespace.

CozoZB C API FFM with Clojure

Using coffi for CozoDB's C Lib.

Download and put in default java.library.path, e.g. here is for macos:

mkdir -p ~/Library/Java/Extensions
cd ~/Library/Java/Extensions
curl -OL https://github.com/cozodb/cozo/releases/download/v0.7.6/libcozo_c-0.7.6-aarch64-apple-darwin.dylib.gz
gunzip libcozo_c-0.7.6-aarch64-apple-darwin.dylib.gz

Then using coffi to load the native library:

(require '[coffi.mem :as mem])
(require '[coffi.ffi :as ffi :refer [defcfn]])
(ffi/load-system-library "cozo_c-0.7.6-aarch64-apple-darwin")

As far as i can dig it for now, the very minimum usage to open, query and close db is working as expected in this ns: me.cozo-clj-ffi.

Datelevin 0.9.22

Previous datalevin version that i use was 0.9.13 circa November 2024. The latest version as of now (Jun 2025) require libomp to be installed in the host. Below are note to install libomp for some os.

• MacOS

1. Download libomp.dylib from mac.r-project.org/openmp.
2. Put it in expected place.

sudo mkdir /opt/homebrew/opt/llvm/lib
curl -O https://mac.r-project.org/openmp/openmp-17.0.6-darwin20-Release.tar.gz
tar zxvf openmp-17.0.6-darwin20-Release.tar.gz
sudo cp -rp usr/local/lib/libomp.dylib /opt/homebrew/opt/llvm/lib

• Fedora

sudo dnf install libomp

• NixOS

To my limited knowledge, the best workaround i can find and apply is this.

1. Find correct libgomp in nix store, e.g. cd /nix/store && fd libgomp.so
2. Put the path into LD_LIBRARY_PATH.

export LD_LIBRARY_PATH=/nix/store/7n3q3rgy5382di7ccrh3r6gk2xp51dh7-gcc-14.2.1.20250322-lib/lib