1 files changed, 40 insertions, 0 deletions
diff --git a/openssl/src/types.rs b/openssl/src/types.rs
new file mode 100644
index 00000000..2fadfd42
--- /dev/null
+++ b/openssl/src/types.rs
@@ -0,0 +1,40 @@
+//! Items used by other types.
+
+/// A type implemented by wrappers over OpenSSL types.
+///
+/// This should not be implemented by anything outside of this crate; new methods may be added at
+/// any time.
+pub trait OpenSslType: Sized {
+    /// The raw C type.
+    type CType;
+
+    /// The type representing a reference to this type.
+    type Ref: OpenSslTypeRef<CType = Self::CType>;
+
+    /// Constructs an instance of this type from its raw type.
+    unsafe fn from_ptr(ptr: *mut Self::CType) -> Self;
+}
+
+/// A trait implemented by types which reference borrowed OpenSSL types.
+///
+/// This should not be implemented by anything outside of this crate; new methods may be added at
+/// any time.
+pub trait OpenSslTypeRef: Sized {
+    /// The raw C type.
+    type CType;
+
+    /// Constructs a shared instance of this type from its raw type.
+    unsafe fn from_ptr<'a>(ptr: *mut Self::CType) -> &'a Self {
+        &*(ptr as *mut _)
+    }
+
+    /// Constructs a mutable reference of this type from its raw type.
+    unsafe fn from_ptr_mut<'a>(ptr: *mut Self::CType) -> &'a mut Self {
+        &mut *(ptr as *mut _)
+    }
+
+    /// Returns a raw pointer to the wrapped value.
+    fn as_ptr(&self) -> *mut Self::CType {
+        self as *const _ as *mut _
+    }
+}