From 033a66e9a5f859798cfc1920eb3129b40fdaa842 Mon Sep 17 00:00:00 2001
From: m-holger <m-holger@kubitscheck.org>
Date: Wed, 21 Sep 2022 20:21:17 +0100
Subject: Tune unparsing of hex strings in QPDF_String::unparse

---
 libqpdf/QPDF_String.cc | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'libqpdf')

diff --git a/libqpdf/QPDF_String.cc b/libqpdf/QPDF_String.cc
index c6cb6c41..b7064f44 100644
--- a/libqpdf/QPDF_String.cc
+++ b/libqpdf/QPDF_String.cc
@@ -113,7 +113,14 @@ QPDF_String::unparse(bool force_binary)
     bool use_hexstring = force_binary || useHexString();
     std::string result;
     if (use_hexstring) {
-        result += "<" + QUtil::hex_encode(this->val) + ">";
+        static auto constexpr hexchars = "0123456789abcdef";
+        result.reserve(2 * this->val.length() + 2);
+        result += '<';
+        for (const char c: this->val) {
+            result += hexchars[static_cast<unsigned char>(c) >> 4];
+            result += hexchars[c & 0x0f];
+        }
+        result += '>';
     } else {
         result += "(";
         for (unsigned int i = 0; i < this->val.length(); ++i) {
-- 
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