I'll write below, the file required to write simple hello world code using RUST, that can be called by WASM/Android/iOS app, compiling and calling will follow in later article.. follow me to be notified..
I tested both WASMand Android and they are fine.
src folder tree:
Hasans-Air:src h_ajsf$ tree .
.
├── lib.rs
├── android
│ └── mod.rs
├── ios
│ └── mod.rs
└── wasm
└── mod.rs
3 directories, 4 files
And the files now are:
Main:
// lib.rs
pub mod wasm;
pub mod ios;
pub mod android;
#[cfg(not(target_arch = "wasm32"))]
use std::os::raw::{c_char};
#[cfg(not(target_arch = "wasm32"))]
use std::ffi::{CStr};
pub fn rust_greetings(to: &str) -> String {
format!("Hello {}", to)
}
#[cfg(not(target_arch = "wasm32"))]
fn char_str(pattern: *const c_char) -> &'static str {
let c_str = unsafe { CStr::from_ptr(pattern) };
let string_ptr = match c_str.to_str() {
Err(_) => "there",
Ok(string) => string,
};
string_ptr
}
WASM
// src/wasm/mod.rs
#[cfg(target_arch = "wasm32")]
pub mod wasm {
use crate::rust_greetings;
use wasm_bindgen::prelude::*;
#[wasm_bindgen]
pub fn wasm_greetings(to: &str) -> String {
rust_greetings(to)
}
}
Android
// src/android/mod.rs
#[cfg(target_os="android")]
#[allow(non_snake_case)]
pub mod android {
use crate::rust_greetings;
use crate::char_str;
extern crate jni;
use self::jni::JNIEnv;
use self::jni::objects::{JClass, JString};
use self::jni::sys::{jstring};
#[no_mangle]
pub unsafe extern fn Java_com_hasan_RustGreetings_greetings(env: JNIEnv, _: JClass, java_pattern: JString) -> jstring {
let jvm_input = env.get_string(java_pattern)
.expect("invalid pattern string").as_ptr();
let input = rust_greetings(char_str(jvm_input));
let output = env.new_string(input)
.expect("Couldn't create java string!");
output.into_inner()
}
}
iOS
// src/ios/mod.rs
#[cfg(target_os="ios")]
#[no_mangle]
pub mod ios {
use crate::char_str;
use std::ffi::{CString, CStr};
use std::os::raw::{c_char};
use crate::rust_greetings;
#[no_mangle]
pub extern fn ios_greetings(to: *const c_char) -> *mut c_char {
let input = rust_greetings(char_str(to));
CString::new(input).unwrap().into_raw()
}
pub extern fn iso_greeting_free(s: *mut c_char) {
unsafe {
if s.is_null() { return }
CString::from_raw(s)
};
}
}
TOML
# Cargo.toml
[package]
name = "greetings"
version = "0.1.0"
authors = ["Hasan Yousef"]
edition = "2018"
[dependencies]
[target.'cfg(target_arch="wasm32")'.dependencies]
wasm-bindgen = "0.2.29"
[target.'cfg(target_os="android")'.dependencies]
jni = { version = "0.5", default-features = false }
[lib]
name = "rust_greetings"
crate-type = ["cdylib", "dylib", "staticlib"]
# Android: dylib
# iOS: cdylib [armv7s-apple-ios] and staticlib [Others]
# WASM: cdylib
Below is to manage the linker for compiling Android targets
Cargo config:
# .cargo/config
[target.aarch64-linux-android]
ar = "NDK/arm64/bin/aarch64-linux-android-ar"
linker = "NDK/arm64/bin/aarch64-linux-android-clang"
[target.armv7-linux-androideabi]
ar = "NDK/arm/bin/arm-linux-androideabi-ar"
linker = "NDK/arm/bin/arm-linux-androideabi-clang"
[target.i686-linux-android]
ar = "NDK/x86/bin/i686-linux-android-ar"
linker = "NDK/x86/bin/i686-linux-android-clang"
[target.x86_64-linux-android]
ar = "NDK/x86/bin/x86_64-linux-android-ar"
linker = "NDK/x86_64/bin/x86_64-linux-android-clang"
Below are for running the WASM, which is already explained (here) [https://dev.to/h_ajsf/rust--wasm-using-bindgen-49b4]
webpack.config.js
// webpack.config.js
const path = require("path");
module.exports = {
entry: "./index.js",
output: {
path: path.resolve(__dirname, "dist"),
filename: "index.js",
},
mode: "development"
};
package.json
// package.json
{
"name": "utils2",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"author": "",
"license": "ISC",
"devDependencies": {
"webpack": "^4.27.1",
"webpack-cli": "^3.1.2",
"webpack-dev-server": "^3.1.10"
}
}
index.js
import("./pkg/greetings").then(wasmModule => {
let gr = wasmModule.wasm_greetings("Karam sweet")
console.log(gr);
});
index.html
<!DOCTYPE html>
<html>
<head>
<script src="./index.js"></script>
<head>
<body></body>
<html>
Top comments (1)
git repo?