feat(ffi): add hyper_request_set_uri_parts

Add a second FFI interface for setting the URI of a request with three
separate schema, authority, and path/query strings, rather than one URI
string.

src/ffi/http_types.rs

@@ -90,6 +90,54 @@ ffi_fn! {
     }
 }
 
+ffi_fn! {
+    /// Set the URI of the request with separate scheme, authority, and
+    /// path/query strings.
+    ///
+    /// Each of `scheme`, `authority`, and `path_and_query` should either be
+    /// null, to skip providing a component, or point to a UTF-8 encoded
+    /// string. If any string pointer argument is non-null, its corresponding
+    /// `len` parameter must be set to the string's length.
+    fn hyper_request_set_uri_parts(
+        req: *mut hyper_request,
+        scheme: *const u8,
+        scheme_len: size_t,
+        authority: *const u8,
+        authority_len: size_t,
+        path_and_query: *const u8,
+        path_and_query_len: size_t
+    ) -> hyper_code {
+        let mut builder = Uri::builder();
+        if !scheme.is_null() {
+            let scheme_bytes = unsafe {
+                std::slice::from_raw_parts(scheme, scheme_len as usize)
+            };
+            builder = builder.scheme(scheme_bytes);
+        }
+        if !authority.is_null() {
+            let authority_bytes = unsafe {
+                std::slice::from_raw_parts(authority, authority_len as usize)
+            };
+            builder = builder.authority(authority_bytes);
+        }
+        if !path_and_query.is_null() {
+            let path_and_query_bytes = unsafe {
+                std::slice::from_raw_parts(path_and_query, path_and_query_len as usize)
+            };
+            builder = builder.path_and_query(path_and_query_bytes);
+        }
+        match builder.build() {
+            Ok(u) => {
+                *unsafe { &mut *req }.0.uri_mut() = u;
+                hyper_code::HYPERE_OK
+            },
+            Err(_) => {
+                hyper_code::HYPERE_INVALID_ARG
+            }
+        }
+    }
+}
+
 ffi_fn! {
     /// Set the preferred HTTP version of the request.
     ///