Bug 1872200 - remove UniFFI `extern-rustbuffer` feature. r=janerik

Differential Revision: https://phabricator.services.mozilla.com/D197925

Cargo.lock

@@ -2239,6 +2239,7 @@ dependencies = [
  "tabs",
  "unic-langid",
  "unic-langid-ffi",
+ "uniffi",
  "uniffi-example-arithmetic",
  "uniffi-example-custom-types",
  "uniffi-example-geometry",
@@ -2247,7 +2248,6 @@ dependencies = [
  "uniffi-example-todolist",
  "uniffi-fixture-callbacks",
  "uniffi-fixture-external-types",
- "uniffi_core",
  "url",
  "viaduct",
  "webext_storage_bridge",

toolkit/library/rust/shared/Cargo.toml

@@ -80,8 +80,7 @@ uniffi-fixture-external-types = { path = "../../../components/uniffi-fixture-ext
 binary_http = { path = "../../../../netwerk/protocol/http/binary_http" }
 oblivious_http = { path = "../../../../netwerk/protocol/http/oblivious_http" }
 mime-guess-ffi = { path = "../../../../dom/fs/parent/rust/mime-guess-ffi" }
-# Explicitly list the `uniffi_core` dependency so we can enable the `extern-rustbuffer` feature.
-uniffi_core = { version = "0.25.2", features = ["extern-rustbuffer"] }
+uniffi = { version = "0.25.2" }
 
 # Note: `modern_sqlite` means rusqlite's bindings file be for a sqlite with
 # version less than or equal to what we link to. This isn't a problem because we

toolkit/library/rust/shared/lib.rs

@@ -171,3 +171,20 @@ pub unsafe extern "C" fn debug_log(target: *const c_char, message: *const c_char
     // NOTE: The `info!` log macro is used here because we have the `release_max_level_info` feature set.
     info!(target: CStr::from_ptr(target).to_str().unwrap(), "{}", CStr::from_ptr(message).to_str().unwrap());
 }
+
+// Define extern "C" versions of these UniFFI functions, so that they can be called from C++
+#[no_mangle]
+pub extern "C" fn uniffi_rustbuffer_alloc(
+    size: i32,
+    call_status: &mut uniffi::RustCallStatus,
+) -> uniffi::RustBuffer {
+    uniffi::uniffi_rustbuffer_alloc(size, call_status)
+}
+
+#[no_mangle]
+pub extern "C" fn uniffi_rustbuffer_free(
+    buf: uniffi::RustBuffer,
+    call_status: &mut uniffi::RustCallStatus,
+) {
+    uniffi::uniffi_rustbuffer_free(buf, call_status)
+}