add rust src lib and makefile

Makefile

@@ -0,0 +1,40 @@
+##
+# Puff - a Huff compiler in Racket
+#
+# @file
+# @version 0.1
+
+KECCAK_LIB_DIR = rust_src/keccaklib
+KECCAK_LIB_TARGET_DIR = $(KECCAK_LIB_DIR)/target/release
+LIB_NAME = libkeccak_lib
+LIB_DIR = lib
+
+ifeq ($(OS),Windows_NT)
+    LIB_EXT = .dll
+else
+    UNAME_S := $(shell uname -s)
+    ifeq ($(UNAME_S),Linux)
+        LIB_EXT = .so
+    endif
+    ifeq ($(UNAME_S),Darwin)
+        LIB_EXT = .dylib
+    endif
+endif
+
+deps: build_rust copy_lib
+
+build_rust:
+	@echo "Building Rust library..."
+	cd $(KECCAK_LIB_DIR) && cargo build --release
+
+copy_lib:
+	@echo "Copying library to $(LIB_DIR) directory..."
+	mkdir -p $(LIB_DIR)
+	cp $(KECCAK_LIB_TARGET_DIR)/$(LIB_NAME)$(LIB_EXT) $(LIB_DIR)/$(LIB_NAME)$(LIB_EXT)
+
+clean:
+	@echo "Cleaning up..."
+	cd $(KECCAK_LIB_DIR) && cargo clean
+	rm -f $(LIB_DIR)/$(LIB_NAME)$(LIB_EXT)
+
+# end

rust_src/keccaklib/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "keccaklib"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+name = "keccak_lib"
+crate-type = ["cdylib"]
+
+[dependencies]
+alloy-primitives = "0.8.8"

rust_src/keccaklib/src/lib.rs

@@ -0,0 +1,10 @@
+use alloy_primitives::utils::keccak256 as keccak;
+
+#[no_mangle]
+pub extern "C" fn keccak256(data_ptr: *const u8, data_len: usize, result_ptr: *mut u8) {
+    let data = unsafe { std::slice::from_raw_parts(data_ptr, data_len) };
+    let hash = keccak(&data);
+    let hash = hash.as_slice();
+    let result = unsafe { std::slice::from_raw_parts_mut(result_ptr, 32) };
+    result.copy_from_slice(hash);
+}

src/keccak.rkt

@@ -3,9 +3,19 @@
 (require ffi/unsafe ffi/unsafe/define "assembler.rkt" threading)
 (require racket/runtime-path)
 
-(define-runtime-path libkeccak "../lib/libkeccak_lib.so")
+(define-runtime-path libdir "../lib")
 
-(define-ffi-definer define-keccak (ffi-lib libkeccak))
+;; define-runtime-path to each library file depending on system
+(define lib-path
+  (cond
+    [(eq? (system-type 'os) 'unix) (build-path libdir "libkeccak_lib.so")]
+    [(eq? (system-type 'os) 'windows) (build-path libdir "libkeccak_lib.dll")]
+    [(eq? (system-type 'os) 'macosx) (build-path libdir "libkeccak_lib.dylib")]
+    [else (error "Unsupported system type")]))
+
+;;(define-runtime-path libkeccak "../lib/libkeccak_lib")
+
+(define-ffi-definer define-keccak (ffi-lib lib-path))
 
 (define-keccak keccak256 (_fun _pointer _size _pointer -> _void))