utils: convert hex to string

1 files changed, 18 insertions, 0 deletions

diff --git a/src/utils/cpp/hex_string.hpp b/src/utils/cpp/hex_string.hpp
index 86ea1b9e..b46240f8 100644
--- a/src/utils/cpp/hex_string.hpp
+++ b/src/utils/cpp/hex_string.hpp
@@ -2,6 +2,8 @@
 #define INCLUDED_SRC_UTILS_CPP_HEX_STRING_HPP
 
 #include <iomanip>
+#include <iostream>
+#include <optional>
 #include <sstream>
 #include <string>
 
@@ -16,4 +18,20 @@
     return ss.str();
 }
 
+[[nodiscard]] static inline auto FromHexString(std::string const& hexstring)
+    -> std::optional<std::string> {
+    try {
+        const size_t kHexBase = 16;
+        std::stringstream ss{};
+        for (size_t i = 0; i < hexstring.length(); i += 2) {
+            unsigned char c =
+                std::stoul(hexstring.substr(i, 2), nullptr, kHexBase);
+            ss << c;
+        }
+        return ss.str();
+    } catch (...) {
+        return std::nullopt;
+    }
+}
+
 #endif  // INCLUDED_SRC_UTILS_CPP_HEX_STRING_HPP