zcash-android-wallet-sdk/src/main/rust/lib.rs

use std::os::raw::{c_char, c_int};

/// For now, this just returns a magic number
#[no_mangle]
pub extern "C" fn test_response(_input: *const c_char) -> c_int {
    let magic_number = 42;
    magic_number
}

/// JNI interface
#[cfg(target_os = "android")]
#[allow(non_snake_case)]
pub mod android {
    extern crate jni;

    use self::jni::objects::{JClass, JString};
    use self::jni::sys::*;
    use self::jni::JNIEnv;
    use super::*;

    #[no_mangle]
    pub unsafe extern "C" fn Java_cash_z_wallet_sdk_jni_JniConverter_getMagicInt(
        env: JNIEnv,
        _: JClass,
        test_input: JString,
    ) -> jint {
        let jvm_text = env
            .get_string(test_input)
            .expect("unable to find text for test input");
        test_response(jvm_text.as_ptr())
    }

    #[no_mangle]
    pub unsafe extern "C" fn Java_cash_z_wallet_sdk_jni_JniConverter_sendComplexData(
        env: JNIEnv,
        _: JClass,
        wallet_data: jbyteArray,
    ) -> jint {
        let bytes = env.convert_byte_array(wallet_data);
        bytes.unwrap().len() as i32
    }
}