From 02281632ccbba3ef00a6968bfd697f4be836d0dd Mon Sep 17 00:00:00 2001
From: Jay Berkenbilt <ejb@ql.org>
Date: Thu, 3 Jan 2019 20:03:30 -0500
Subject: Add QUtil::utf8_to_ascii

---
 libqpdf/QUtil.cc | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

(limited to 'libqpdf')

diff --git a/libqpdf/QUtil.cc b/libqpdf/QUtil.cc
index 44ffec7f..7c2d9bc9 100644
--- a/libqpdf/QUtil.cc
+++ b/libqpdf/QUtil.cc
@@ -892,3 +892,26 @@ QUtil::parse_numrange(char const* range, int max)
     }
     return result;
 }
+
+std::string
+QUtil::utf8_to_ascii(std::string const& utf8, char unknown_char)
+{
+    std::string ascii_value;
+    for (size_t i = 0; i < utf8.length(); ++i)
+    {
+        unsigned char ch = static_cast<unsigned char>(utf8.at(i));
+        if (ch < 128)
+        {
+            ascii_value.append(1, ch);
+        }
+        else if ((ch & 0xc0) == 0x80)
+        {
+            // Ignore subsequent byte of UTF-8 encoded character
+        }
+        else
+        {
+            ascii_value.append(1, unknown_char);
+        }
+    }
+    return ascii_value;
+}
-- 
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