1 files changed, 57 insertions, 0 deletions
diff --git a/netwerk/base/rust-url-capi/src/string_utils.rs b/netwerk/base/rust-url-capi/src/string_utils.rs
new file mode 100644
index 0000000000..ae68a60dc3
--- /dev/null
+++ b/netwerk/base/rust-url-capi/src/string_utils.rs
@@ -0,0 +1,57 @@
+extern crate libc;
+use libc::size_t;
+
+extern crate std;
+use std::ptr;
+
+use error_mapping::*;
+
+extern "C" {
+  fn c_fn_set_size(user: *mut libc::c_void, size: size_t) -> i32;
+  fn c_fn_get_buffer(user: *mut libc::c_void) -> *mut libc::c_char;
+}
+
+pub trait StringContainer {
+  fn set_size(&self, size_t) -> i32;
+  fn get_buffer(&self) -> *mut libc::c_char;
+  fn assign(&self, content: &str) -> i32;
+}
+
+impl StringContainer for *mut libc::c_void {
+  fn set_size(&self, size: size_t) -> i32 {
+    if (*self).is_null() {
+      return NSError::InvalidArg.error_code();
+    }
+    unsafe {
+      c_fn_set_size(*self, size);
+    }
+
+    return NSError::OK.error_code();
+  }
+  fn get_buffer(&self) -> *mut libc::c_char {
+    if (*self).is_null() {
+      return 0 as *mut libc::c_char;
+    }
+    unsafe {
+      c_fn_get_buffer(*self)
+    }
+  }
+  fn assign(&self, content: &str) -> i32 {
+    if (*self).is_null() {
+      return NSError::InvalidArg.error_code();
+    }
+
+    unsafe {
+      let slice = content.as_bytes();
+      c_fn_set_size(*self, slice.len());
+      let buf = c_fn_get_buffer(*self);
+      if buf.is_null() {
+        return NSError::Failure.error_code();
+      }
+
+      ptr::copy(slice.as_ptr(), buf as *mut u8, slice.len());
+    }
+
+    NSError::OK.error_code()
+  }
+}