1 files changed, 66 insertions, 0 deletions
diff --git a/Source/cm_codecvt.hxx b/Source/cm_codecvt.hxx
new file mode 100644
index 0000000..2df3961
--- /dev/null
+++ b/Source/cm_codecvt.hxx
@@ -0,0 +1,66 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#ifndef cm_codecvt_hxx
+#define cm_codecvt_hxx
+
+#include "cmConfigure.h" // IWYU pragma: keep
+
+#include <locale>
+#include <wchar.h>
+
+class codecvt : public std::codecvt<char, char, mbstate_t>
+{
+public:
+  enum Encoding
+  {
+    None,
+    UTF8,
+    ANSI
+  };
+
+#ifdef CMAKE_BUILD_WITH_CMAKE
+
+  codecvt(Encoding e);
+
+protected:
+  ~codecvt() override;
+  bool do_always_noconv() const throw() override;
+  result do_out(mbstate_t& state, const char* from, const char* from_end,
+                const char*& from_next, char* to, char* to_end,
+                char*& to_next) const override;
+  result do_unshift(mbstate_t& state, char* to, char*,
+                    char*& to_next) const override;
+  int do_max_length() const throw() override;
+  int do_encoding() const throw() override;
+
+private:
+  // The mbstate_t argument to do_out and do_unshift is responsible
+  // for storing state between calls.  We cannot control the type
+  // since we want to imbue on standard streams.  However, we do
+  // know that it is a trivial type.  Define our own type to overlay
+  // on it safely with no alignment requirements.
+  struct State
+  {
+    // Buffer bytes we have consumed from a partial codepoint.
+    char partial[3];
+
+    // Number of bytes we have buffered from a partial codepoint.
+    unsigned char buffered : 4;
+
+    // Size of the current codepoint in bytes.
+    unsigned char size : 4;
+  };
+
+  bool m_noconv;
+#  if defined(_WIN32)
+  unsigned int m_codepage;
+  result Decode(mbstate_t& state, int need, const char*& from_next,
+                char*& to_next, char* to_end) const;
+  result DecodePartial(mbstate_t& state, char*& to_next, char* to_end) const;
+  void BufferPartial(mbstate_t& state, int need, const char*& from_next) const;
+#  endif
+
+#endif
+};
+
+#endif