rust/rusty: Add wrappers for new functions

libunit-wasm added two new functions, luw_req_buf_copy() &
luw_mem_splice_file(). See the previous two commits...

This second function takes a file-descriptor as one of its arguments, in
rusty we make this a Rust File object, then pass the underlying fd into
libunit-wasm.

Signed-off-by: Andrew Clayton <a.clayton@nginx.com>

Author: ac000

src/rust/unit-wasm-sys/rusty.rs

@@ -8,6 +8,8 @@
 use std::ffi::c_char;
 use std::ffi::c_void;
 use std::ffi::CStr;
+use std::fs::File;
+use std::os::fd::{AsRawFd, RawFd};
 use std::ptr::null_mut;
 use std::slice;
 use std::str;
@@ -175,6 +177,17 @@ pub fn uwr_req_buf_append(ctx: *mut luw_ctx_t, src: *const u8) {
     }
 }
 
+pub fn uwr_req_buf_copy(ctx: *mut luw_ctx_t, src: *const u8) {
+    unsafe {
+        luw_req_buf_copy(ctx, src);
+    }
+}
+
+pub fn uwr_mem_splice_file(src: *const u8, f: &mut File) -> isize {
+    let fd: RawFd = f.as_raw_fd();
+    unsafe { luw_mem_splice_file(src, fd) }
+}
+
 pub fn uwr_mem_fill_buf_from_req(ctx: *mut luw_ctx_t, from: usize) -> usize {
     unsafe { luw_mem_fill_buf_from_req(ctx, from) }
 }