[qtfm] feat #4: implement QingTingFM decipher

um_crypto/utils/src/base64.rs

@@ -9,6 +9,12 @@ pub const ENGINE: Base64Engine = Base64Engine::new(
     GeneralPurposeConfig::new().with_decode_padding_mode(DecodePaddingMode::Indifferent),
 );
 
+/// Don't add padding when encoding, and require no padding when decoding.
+pub const ENGINE_URL_SAFE: Base64Engine = Base64Engine::new(
+    &alphabet::URL_SAFE,
+    GeneralPurposeConfig::new().with_decode_padding_mode(DecodePaddingMode::Indifferent),
+);
+
 pub fn encode<T>(data: T) -> String
 where
     T: AsRef<[u8]>,
@@ -33,3 +39,17 @@ where
     data[..len].copy_from_slice(&decoded);
     Ok(&data[..len])
 }
+
+pub fn encode_url_safe<T>(data: T) -> String
+where
+    T: AsRef<[u8]>,
+{
+    ENGINE_URL_SAFE.encode(data)
+}
+
+pub fn decode_url_safe<T>(data: T) -> Result<Vec<u8>, DecodeError>
+where
+    T: AsRef<[u8]>,
+{
+    ENGINE_URL_SAFE.decode(data)
+}