Support Unicode in filenames (fixes #298)

1 files changed, 32 insertions, 1 deletions

diff --git a/libqpdf/QUtil.cc b/libqpdf/QUtil.cc
index 7ea3f5e7..816c2dfa 100644
--- a/libqpdf/QUtil.cc
+++ b/libqpdf/QUtil.cc
@@ -354,11 +354,42 @@ FILE*
 QUtil::safe_fopen(char const* filename, char const* mode)
 {
     FILE* f = 0;
+#ifdef _WIN32
+    // Convert the utf-8 encoded filename argument to wchar_t*. First,
+    // convert to utf16, then to wchar_t*. Note that u16 will start
+    // with the UTF16 marker, which we skip.
+    std::string u16 = utf8_to_utf16(filename);
+    size_t len = u16.length();
+    size_t wlen = (len / 2) - 1;
+    PointerHolder<wchar_t> wfilenamep(true, new wchar_t[wlen + 1]);
+    wchar_t* wfilename = wfilenamep.getPointer();
+    wfilename[wlen] = 0;
+    for (unsigned int i = 2; i < len; i += 2)
+    {
+        wfilename[(i/2) - 1] =
+            static_cast<wchar_t>(
+                (static_cast<unsigned char>(u16.at(i)) << 8) +
+                static_cast<unsigned char>(u16.at(i+1)));
+    }
+    PointerHolder<wchar_t> wmodep(true, new wchar_t(strlen(mode) + 1));
+    wchar_t* wmode = wmodep.getPointer();
+    wmode[strlen(mode)] = 0;
+    for (size_t i = 0; i < strlen(mode); ++i)
+    {
+        wmode[i] = mode[i];
+    }
+
 #ifdef _MSC_VER
-    errno_t err = fopen_s(&f, filename, mode);
+    errno_t err = _wfopen_s(&f, wfilename, wmode);
     if (err != 0)
     {
         errno = err;
+    }
+#else
+    f = _wfopen(wfilename, wmode);
+#endif
+    if (f == 0)
+    {
         throw_system_error(std::string("open ") + filename);
     }
 #else