diff --git a/src/client/result/ResultParser.rs b/src/client/result/ResultParser.rs
index b411f62..e9e262c 100644
--- a/src/client/result/ResultParser.rs
+++ b/src/client/result/ResultParser.rs
@@ -226,17 +226,23 @@ pub fn unescapeBackslash(escaped: &str) -> String {
     unescaped
 }
 
-pub fn parseHexDigit(c: char) -> i32 {
-    if c.is_ascii_digit() {
-        return (c as u8 - b'0') as i32;
-    }
-    if ('a'..='f').contains(&c) {
-        return 10 + (c as u8 - b'a') as i32;
-    }
-    if ('A'..='F').contains(&c) {
-        return 10 + (c as u8 - b'A') as i32;
-    }
-    -1
+#[inline(always)]
+pub fn parseHexDigit(c: char) -> Option<u32> {
+    c.to_digit(16)
+    // let Some(v) = c.to_digit(16) else {
+    //     return -1
+    // };
+    // v as i32
+    // if c.is_ascii_digit() {
+    //     return (c as u8 - b'0') as i32;
+    // }
+    // if ('a'..='f').contains(&c) {
+    //     return 10 + (c as u8 - b'a') as i32;
+    // }
+    // if ('A'..='F').contains(&c) {
+    //     return 10 + (c as u8 - b'A') as i32;
+    // }
+    // -1
 }
 
 #[inline(always)]
diff --git a/src/client/result/VCardResultParser.rs b/src/client/result/VCardResultParser.rs
index b5e4e9c..a36dc4a 100644
--- a/src/client/result/VCardResultParser.rs
+++ b/src/client/result/VCardResultParser.rs
@@ -337,8 +337,10 @@ fn decodeQuotedPrintable(value: &str, charset: &str) -> String {
             let nextChar = value.chars().nth(i + 1).unwrap();
             if nextChar != '\r' && nextChar != '\n' {
                 let nextNextChar = value.chars().nth(i + 2).unwrap();
-                let firstDigit = ResultParser::parseHexDigit(nextChar);
-                let secondDigit = ResultParser::parseHexDigit(nextNextChar);
+                let firstDigit =
+                    ResultParser::parseHexDigit(nextChar).map_or_else(|| -1, |d| d as i32);
+                let secondDigit =
+                    ResultParser::parseHexDigit(nextNextChar).map_or_else(|| -1, |d| d as i32);
                 if firstDigit >= 0 && secondDigit >= 0 {
                     fragmentBuffer.push(((firstDigit << 4) + secondDigit) as u8);
                 } // else ignore it, assume it was incorrectly encoded