Add C API and Julia bindings for Zarr Store

Cargo.toml

@@ -1,8 +1,11 @@
 [workspace]
-members = ["icechunk", "icechunk-python", "icechunk-macros"]
+members = ["icechunk", "icechunk-python", "icechunk-macros", "icechunk-c"]
 default-members = ["icechunk"]
 resolver = "2"
 
+[workspace.package]
+edition = "2024"
+
 [workspace.lints.clippy]
 expect_used = "warn"
 unwrap_used = "warn"

icechunk-c/Cargo.toml

@@ -0,0 +1,24 @@
+[package]
+name = "icechunk-c"
+version = "0.1.0"
+edition.workspace = true
+publish = false
+
+[lib]
+crate-type = ["cdylib", "staticlib"]
+
+[dependencies]
+icechunk = { path = "../icechunk", version = "0.3.14" }
+tokio = { version = "1", features = ["rt-multi-thread"] }
+bytes = "1"
+futures = "0.3"
+libc = "0.2"
+
+[build-dependencies]
+cbindgen = "0.28"
+
+[dev-dependencies]
+tempfile = "3"
+
+[lints]
+workspace = true

icechunk-c/build.rs

@@ -0,0 +1,19 @@
+fn main() {
+    let Ok(crate_dir) = std::env::var("CARGO_MANIFEST_DIR") else {
+        eprintln!("CARGO_MANIFEST_DIR not set");
+        return;
+    };
+    let config_path = std::path::Path::new(&crate_dir).join("cbindgen.toml");
+    let config = cbindgen::Config::from_file(&config_path).unwrap_or_default();
+
+    let output_path = std::path::Path::new(&crate_dir).join("include").join("icechunk.h");
+
+    match cbindgen::Builder::new().with_crate(&crate_dir).with_config(config).generate() {
+        Ok(bindings) => {
+            bindings.write_to_file(&output_path);
+        }
+        Err(e) => {
+            eprintln!("Unable to generate C bindings: {e}");
+        }
+    }
+}

icechunk-c/cbindgen.toml

@@ -0,0 +1,11 @@
+language = "C"
+header = "/* Generated by cbindgen — do not edit */"
+include_guard = "ICECHUNK_H"
+no_includes = true
+sys_includes = ["stdint.h", "stddef.h", "stdbool.h"]
+
+[export]
+prefix = ""
+
+[enum]
+rename_variants = "ScreamingSnakeCase"