1 files changed, 59 insertions, 0 deletions
diff --git a/openssl/src/crypto.rs b/openssl/src/crypto.rs
new file mode 100644
index 00000000..ce83cbae
--- /dev/null
+++ b/openssl/src/crypto.rs
@@ -0,0 +1,59 @@
+use libc::{c_char, c_int, c_void};
+use std::fmt;
+use std::ffi::CStr;
+use std::slice;
+use std::ops::Deref;
+use std::str;
+
+pub struct CryptoString(&'static str);
+
+impl Drop for CryptoString {
+    fn drop(&mut self) {
+        unsafe {
+            CRYPTO_free(self.0.as_ptr() as *mut c_void,
+                        concat!(file!(), "\0").as_ptr() as *const c_char,
+                        line!() as c_int);
+        }
+    }
+}
+
+impl Deref for CryptoString {
+    type Target = str;
+
+    fn deref(&self) -> &str {
+        self.0
+    }
+}
+
+impl CryptoString {
+    pub unsafe fn from_raw_parts(buf: *mut u8, len: usize) -> CryptoString {
+        let slice = slice::from_raw_parts(buf, len);
+        CryptoString(str::from_utf8_unchecked(slice))
+    }
+
+    pub unsafe fn from_null_terminated(buf: *mut c_char) -> CryptoString {
+        let slice = CStr::from_ptr(buf).to_bytes();
+        CryptoString(str::from_utf8_unchecked(slice))
+    }
+}
+
+impl fmt::Display for CryptoString {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        fmt::Display::fmt(self.0, f)
+    }
+}
+
+impl fmt::Debug for CryptoString {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        fmt::Debug::fmt(self.0, f)
+    }
+}
+
+#[cfg(not(ossl110))]
+#[allow(non_snake_case)]
+unsafe fn CRYPTO_free(buf: *mut c_void, _: *const c_char, _: c_int) {
+    ::ffi::CRYPTO_free(buf);
+}
+
+#[cfg(ossl110)]
+use ffi::CRYPTO_free;