3 files changed, 55 insertions, 0 deletions
diff --git a/dom/fs/parent/rust/mime-guess-ffi/Cargo.toml b/dom/fs/parent/rust/mime-guess-ffi/Cargo.toml
new file mode 100644
index 0000000000..d97f8202d7
--- /dev/null
+++ b/dom/fs/parent/rust/mime-guess-ffi/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "mime-guess-ffi"
+version = "0.1.0"
+license = "MPL-2.0"
+authors = ["The Mozilla Project Developers"]
+
+[dependencies]
+mime_guess = "2.0.4"
+nserror = { path = "../../../../../xpcom/rust/nserror" }
+nsstring = { path = "../../../../../xpcom/rust/nsstring" }
diff --git a/dom/fs/parent/rust/mime-guess-ffi/cbindgen.toml b/dom/fs/parent/rust/mime-guess-ffi/cbindgen.toml
new file mode 100644
index 0000000000..d7f94927ab
--- /dev/null
+++ b/dom/fs/parent/rust/mime-guess-ffi/cbindgen.toml
@@ -0,0 +1,11 @@
+header = """/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */"""
+autogen_warning = """/* DO NOT MODIFY THIS MANUALLY! This file was generated using cbindgen. See RunCbindgen.py */"""
+include_guard = "DOM_FS_PARENT_RUST_MIME_GUESS_FFI_H_"
+include_version = true
+braces = "SameLine"
+line_length = 100
+tab_width = 2
+language = "C++"
+namespaces = ["mozilla", "dom", "fs"]
diff --git a/dom/fs/parent/rust/mime-guess-ffi/src/lib.rs b/dom/fs/parent/rust/mime-guess-ffi/src/lib.rs
new file mode 100644
index 0000000000..19833fd202
--- /dev/null
+++ b/dom/fs/parent/rust/mime-guess-ffi/src/lib.rs
@@ -0,0 +1,34 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+extern crate mime_guess;
+extern crate nserror;
+extern crate nsstring;
+
+use nserror::{nsresult, NS_ERROR_FAILURE, NS_ERROR_INVALID_ARG, NS_ERROR_NOT_AVAILABLE, NS_OK};
+use nsstring::{nsACString, nsCString};
+use std::path::Path;
+use std::str;
+
+#[no_mangle]
+pub extern "C" fn mimeGuessFromPath(path: &nsACString, content_type: &mut nsCString) -> nsresult {
+    let path_data = str::from_utf8(path.as_ref());
+    if path_data.is_err() {
+        return NS_ERROR_INVALID_ARG; // Not UTF8
+    }
+
+    let content_path = Path::new(path_data.unwrap());
+    if content_path.extension().is_none() {
+        return NS_ERROR_NOT_AVAILABLE; // No mime type information
+    }
+
+    let maybe_mime = mime_guess::from_path(content_path).first_raw();
+    if maybe_mime.is_none() {
+        return NS_ERROR_FAILURE; // Not recognized
+    }
+
+    content_type.assign(maybe_mime.unwrap());
+
+    NS_OK
+}