feat: generate java bindings

Cargo.toml

@@ -50,7 +50,7 @@ instant = { version = "0.1.13", features = ["wasm-bindgen"] }
 gloo-timers = { version = "0.3.0", features = ["futures"] }
 
 [build-dependencies]
-cbindgen = "0.26.0"
+cbindgen = { git = "https://github.com/fredszaq/cbindgen", branch = "java-jna-backend" }
 
 [patch.crates-io]
 # Remove this patch once the following PR is merged: <https://github.com/xJonathanLEI/starknet-rs/pull/615>

build.rs

@@ -108,6 +108,41 @@ fn main() {
         .expect("Unable to generate bindings")
         .write_to_file("dojo.pyx");
 
+        cbindgen::Builder::new()
+        .with_config({
+            let mut config = cbindgen::Config::default();
+
+            config.language = cbindgen::Language::JavaJna;
+            config.braces = cbindgen::Braces::SameLine;
+            config.style = cbindgen::Style::Both;
+            config.layout = cbindgen::LayoutConfig { ..Default::default() };
+            config.enumeration = cbindgen::EnumConfig {
+                derive_helper_methods: true,
+                // prefix_with_name: true,
+                ..Default::default()
+            };
+            config.export = cbindgen::ExportConfig {
+                mangle: cbindgen::MangleConfig { remove_underscores: true, ..Default::default() },
+                ..Default::default()
+            };
+
+            // config.structure.derive_constructor = true;
+            // config.structure.derive_eq = true;
+            config.namespace = Some("dojo_bindings".to_string());
+
+            config.defines = HashMap::new();
+            config.defines.insert(
+                "target_pointer_width = 32".to_string(),
+                "TARGET_POINTER_WIDTH_32".to_string(),
+            );
+
+            config
+        })
+        .with_crate(crate_dir.clone())
+        .generate()
+        .expect("Unable to generate bindings")
+        .write_to_file("dojo.java");
+
     // NOTE: disable for now. use c2cs to generate csharp bindings
     // generics not supported
     // csbindgen::Builder::default()

dojo.h

@@ -712,5 +712,5 @@ void carray_free(void *data, uintptr_t data_len);
 void string_free(char *string);
 
 #ifdef __cplusplus
-} // extern "C"
-#endif // __cplusplus
+}  // extern "C"
+#endif  // __cplusplus

dojo.hpp

@@ -937,6 +937,6 @@ void carray_free(void *data, uintptr_t data_len);
 
 void string_free(char *string);
 
-} // extern "C"
+}  // extern "C"
 
-} // namespace dojo_bindings
+}  // namespace dojo_bindings