From e0c6872cf40896c7be36b11dcc744620f10adf1d Mon Sep 17 00:00:00 2001
From: Norbert Preining <norbert@preining.info>
Date: Mon, 2 Sep 2019 13:46:59 +0900
Subject: Initial commit

---
 support/extractpdfmark/src/utf8.cc | 73 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 support/extractpdfmark/src/utf8.cc

(limited to 'support/extractpdfmark/src/utf8.cc')

diff --git a/support/extractpdfmark/src/utf8.cc b/support/extractpdfmark/src/utf8.cc
new file mode 100644
index 0000000000..b58f1c0fe5
--- /dev/null
+++ b/support/extractpdfmark/src/utf8.cc
@@ -0,0 +1,73 @@
+// This file is part of Extract PDFmark.
+//
+// Copyright (C) 2016 Masamichi Hosoda
+//
+// Extract PDFmark is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Extract PDFmark is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Extract PDFmark.  If not, see <http://www.gnu.org/licenses/>.
+
+#include "config.h"
+
+#include "utf8.hh"
+
+#ifdef USE_CODECVT
+#include <cwchar>
+#include <codecvt>
+#endif
+
+#include <string>
+
+#ifdef USE_ICONV
+#include "iconv_wrapper.hh"
+#endif
+
+#ifdef USE_CODECVT
+
+bool is_utf8 (const std::string &str)
+{
+  std::codecvt_utf8<char32_t> cvt;
+  auto mb {std::mbstate_t ()};
+  return (cvt.length (mb, &str.front (), &str.front () + str.length (),
+                      std::string::npos)
+          == str.length ());
+}
+
+#else  // USE_CODECVT
+
+#ifdef USE_ICONV
+
+bool is_utf8 (const std::string &str)
+{
+  try
+    {
+      iconv_wrapper::iconv cvt8to16 {"UTF-8", "UTF-16"};
+      std::string utf16 {cvt8to16.convert (str)};
+      iconv_wrapper::iconv cvt16to8 {"UTF-16", "UTF-8"};
+      std::string utf8 {cvt16to8.convert (utf16)};
+      return (str == utf8);
+    }
+  catch (std::system_error &error)
+    {
+      return false;
+    }
+  return false;
+}
+
+#else  // USE_ICONV
+
+bool is_utf8 (const std::string &str)
+{
+  return false;
+}
+
+#endif  // USE_ICONV
+#endif  // USE_CODECVT
-- 
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