Add high-level result interface

.codespell-whitelist

@@ -1 +1,2 @@
 iff
+mut

bindings/rust/evmc-vm/src/lib.rs

@@ -5,3 +5,41 @@ pub use evmc_sys as ffi;
 // TODO: Add convenient helpers for evmc_result
 // TODO: Add convenient helpers for evmc_execute
 // TODO: Add a derive macro here for creating evmc_create
+
+//pub fn destroy_result(&mut evmc_result)
+
+/// EVMC result structure.
+pub struct EvmcResult(Box<ffi::evmc_result>);
+
+impl EvmcResult {
+    pub fn new(
+        status: ffi::evmc_status_code,
+        gasleft: i64,
+        output: &[u8],
+        create_addr: Option<ffi::evmc_address>,
+    ) -> Self 
+    {
+        EvmcResult {
+            status_code: status,
+            gas_left: i64,
+            output_data: output.as_ptr(),
+            output_size: output.len(),
+            release: release_result,
+            create_address: if let Some(addr) = create_addr {
+                addr
+            } else {
+                evmc_address {
+                    bytes: [0u8; 20],
+                }
+            },
+            padding: [0u8; 4],
+        }
+    }
+}
+
+#[no_mangle]
+pub extern "C" fn release_result(result: *const ffi::evmc_result) {
+    unsafe {
+        Box::from_raw(result);
+    }
+}