tor

commit 2f3a7376c06e39942ac3c4d447ca94759f12a5c3
parent 15e59a1fedf47e7e689e06e5649849552d8b8c0d
Author: Isis Lovecruft <isis@torproject.org>
Date:   Wed, 21 Mar 2018 02:45:41 +0000

rust: Refactor Rust impl of protover_all_supported().

This includes differences in behaviour to before, which should now more closely
match the C version:

 - If parsing a protover `char*` from C, and the string is not parseable, this
   function will return 1 early, which matches the C behaviour when protocols
   are unparseable.  Previously, we would parse it and its version numbers
   simultaneously, i.e. there was no fail early option, causing us to spend more
   time unnecessarily parsing versions.

 * REFACTOR `protover::ffi::protover_all_supported()` to use new types and
   methods.

Diffstat:
M
src/rust/protover/ffi.rs
 | 
15
+++++++++++----

1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/src/rust/protover/ffi.rs b/src/rust/protover/ffi.rs
@@ -56,19 +56,26 @@ pub extern "C" fn protover_all_supported(
         Err(_) => return 1,
     };
 
-    let (is_supported, unsupported) = all_supported(relay_version);
+    let relay_proto_entry: UnvalidatedProtoEntry = match relay_version.parse() {
+        Ok(n)  => n,
+        Err(_) => return 1,
+    };
+    let maybe_unsupported: Option<UnvalidatedProtoEntry> = relay_proto_entry.all_supported();
 
-    if unsupported.len() > 0 {
-        let c_unsupported = match CString::new(unsupported) {
+    if maybe_unsupported.is_some() {
+        let unsupported: UnvalidatedProtoEntry = maybe_unsupported.unwrap();
+        let c_unsupported: CString = match CString::new(unsupported.to_string()) {
             Ok(n) => n,
             Err(_) => return 1,
         };
 
         let ptr = c_unsupported.into_raw();
         unsafe { *missing_out = ptr };
+
+        return 0;
     }
 
-    return if is_supported { 1 } else { 0 };
+    1
 }
 
 /// Provide an interface for C to translate arguments and return types for