enhance 'ssl_version' to be able to set max version as well

Author: Guanqun Lu

src/easy/handle.rs

@@ -949,8 +949,8 @@ impl Easy {
     }
 
     /// Same as [`Easy2::ssl_version`](struct.Easy2.html#method.ssl_version)
-    pub fn ssl_version(&mut self, version: SslVersion) -> Result<(), Error> {
-        self.inner.ssl_version(version)
+    pub fn ssl_version(&mut self, min_version: SslVersion, max_version: SslVersion) -> Result<(), Error> {
+        self.inner.ssl_version(min_version, max_version)
     }
 
     /// Same as [`Easy2::ssl_verify_host`](struct.Easy2.html#method.ssl_verify_host)

src/easy/handler.rs

@@ -467,7 +467,7 @@ pub enum HttpVersion {
     __Nonexhaustive = 500,
 }
 
-/// Possible values to pass to the `ip_resolve` method.
+/// Possible values to pass to the `ssl_version` method.
 #[allow(missing_docs)]
 #[derive(Debug)]
 pub enum SslVersion {
@@ -1949,8 +1949,9 @@ impl<H> Easy2<H> {
     ///
     /// By default this option is not set and corresponds to
     /// `CURLOPT_SSLVERSION`.
-    pub fn ssl_version(&mut self, version: SslVersion) -> Result<(), Error> {
-        self.setopt_long(curl_sys::CURLOPT_SSLVERSION, version as c_long)
+    pub fn ssl_version(&mut self, min_version: SslVersion, max_version: SslVersion) -> Result<(), Error> {
+        let version = (min_version as c_long) | ((max_version as c_long) << 16);
+        self.setopt_long(curl_sys::CURLOPT_SSLVERSION, version)
     }
 
     /// Verify the certificate's name against host.