Add C FFI [WIP]

Cargo.toml

@@ -1,29 +1,6 @@
-[package]
-name = "rekordcrate"
-version = "0.1.1"
-authors = ["Jan Holthuis <jan.holthuis@ruhr-uni-bochum.de>"]
-description = "Library for parsing Pioneer Rekordbox device exports"
-readme = "README.md"
-repository = "https://github.com/Holzhaus/rekordcrate"
-license = "MPL-2.0"
-keywords = ["rekordbox", "dj", "export", "database", "parser"]
-categories = ["parser-implementations"]
-edition = "2021"
-exclude = [".*"]
+[workspace]
 
-[dependencies]
-binrw = "0.10"
-modular-bitfield = "0.11"
-crc16 = "0.4"
-clap = { version = "4.0.10", features = ["derive"], optional = true }
-
-[build-dependencies]
-glob = "0.3"
-
-[features]
-default = ["cli"]
-cli = ["dep:clap"]
-
-[[bin]]
-name = "rekordcrate"
-required-features = ["cli"]
+members = [
+    "rekordcrate",
+    "rekordcrate-ffi",
+]

rekordcrate-ffi/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "rekordcrate-ffi"
+version = "0.1.1"
+authors = ["Jan Holthuis <jan.holthuis@ruhr-uni-bochum.de>"]
+description = "C bindings for rekordcrate"
+readme = "README.md"
+repository = "https://github.com/Holzhaus/rekordcrate"
+license = "MPL-2.0"
+keywords = ["rekordbox", "dj", "export", "database", "parser"]
+categories = ["parser-implementations"]
+edition = "2021"
+exclude = [".*"]
+
+[dependencies]
+rekordcrate = { version = "0.1.1", path = "../rekordcrate" }
+
+[build-dependencies]
+cbindgen = "0.24.3"
+
+[lib]
+crate_type = ["cdylib"]

rekordcrate-ffi/build.rs

@@ -0,0 +1,36 @@
+// Copyright (c) 2022 Jan Holthuis <jan.holthuis@rub.de>
+//
+// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy
+// of the MPL was not distributed with this file, You can obtain one at
+// http://mozilla.org/MPL/2.0/.
+//
+// SPDX-License-Identifier: MPL-2.0
+
+use std::env;
+use std::path::PathBuf;
+
+fn main() {
+    let crate_dir = env::var("CARGO_MANIFEST_DIR").unwrap();
+    let output_file = target_dir()
+        .join("include")
+        .join("rekordcrate.h")
+        .display()
+        .to_string();
+
+    cbindgen::Builder::new()
+        .with_crate(crate_dir)
+        .generate()
+        .expect("Unable to generate bindings")
+        .write_to_file(&output_file);
+}
+
+/// Find the location of the `target/` directory. Note that this may be
+/// overridden by `cmake`, so we also need to check the `CARGO_TARGET_DIR`
+/// variable.
+fn target_dir() -> PathBuf {
+    if let Ok(target) = env::var("CARGO_TARGET_DIR") {
+        PathBuf::from(target)
+    } else {
+        PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap()).join("target")
+    }
+}