Add helper to decoder Cow data, which retains original lifetime

src/encoding.rs

@@ -99,6 +99,15 @@ impl Decoder {
 
         Ok(())
     }
+
+    /// Decodes the `Cow` buffer, preserves the lifetime
+    pub(crate) fn decode_cow<'b>(&self, bytes: &Cow<'b, [u8]>) -> Result<Cow<'b, str>> {
+        match bytes {
+            Cow::Borrowed(bytes) => self.decode(bytes),
+            // Convert to owned, because otherwise Cow will be bound with wrong lifetime
+            Cow::Owned(bytes) => Ok(self.decode(bytes)?.into_owned().into()),
+        }
+    }
 }
 
 /// Decodes the provided bytes using the specified encoding.

src/events/attributes.rs

@@ -98,11 +98,7 @@ impl<'a> Attribute<'a> {
         decoder: Decoder,
         resolve_entity: impl FnMut(&str) -> Option<&'entity str>,
     ) -> XmlResult<Cow<'a, str>> {
-        let decoded = match &self.value {
-            Cow::Borrowed(bytes) => decoder.decode(bytes)?,
-            // Convert to owned, because otherwise Cow will be bound with wrong lifetime
-            Cow::Owned(bytes) => decoder.decode(bytes)?.into_owned().into(),
-        };
+        let decoded = decoder.decode_cow(&self.value)?;
 
         match unescape_with(&decoded, resolve_entity)? {
             // Because result is borrowed, no replacements was done and we can use original string

src/events/mod.rs

@@ -595,11 +595,7 @@ impl<'a> BytesText<'a> {
         &self,
         resolve_entity: impl FnMut(&str) -> Option<&'entity str>,
     ) -> Result<Cow<'a, str>> {
-        let decoded = match &self.content {
-            Cow::Borrowed(bytes) => self.decoder.decode(bytes)?,
-            // Convert to owned, because otherwise Cow will be bound with wrong lifetime
-            Cow::Owned(bytes) => self.decoder.decode(bytes)?.into_owned().into(),
-        };
+        let decoded = self.decoder.decode_cow(&self.content)?;
 
         match unescape_with(&decoded, resolve_entity)? {
             // Because result is borrowed, no replacements was done and we can use original string
@@ -810,11 +806,7 @@ impl<'a> BytesCData<'a> {
 
     /// Gets content of this text buffer in the specified encoding
     pub(crate) fn decode(&self) -> Result<Cow<'a, str>> {
-        Ok(match &self.content {
-            Cow::Borrowed(bytes) => self.decoder.decode(bytes)?,
-            // Convert to owned, because otherwise Cow will be bound with wrong lifetime
-            Cow::Owned(bytes) => self.decoder.decode(bytes)?.into_owned().into(),
-        })
+        self.decoder.decode_cow(&self.content)
     }
 }