Improve Unicode file name handling in Win9x

taglib/toolkit/tfilestream.cpp

@@ -58,9 +58,9 @@ namespace
     const DWORD access = readOnly ? GENERIC_READ : (GENERIC_READ | GENERIC_WRITE);
 
     if(!path.wstr().empty())
-      return CreateFileW(path, access, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL);
+      return CreateFileW(path.wstr().c_str(), access, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL);
     else if(!path.str().empty())
-      return CreateFileA(path, access, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL);
+      return CreateFileA(path.str().c_str(), access, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL);
     else
       return INVALID_FILE;
   }

taglib/toolkit/tiostream.cpp

@@ -27,6 +27,97 @@
 
 using namespace TagLib;
 
+#ifdef _WIN32
+
+// MSVC 2008 or later can't produce the binary for Win9x.
+#if !defined(_MSC_VER) || (_MSC_VER < 1500)
+
+namespace 
+{
+
+  // Determines whether or not the running system is WinNT.
+  // In other words, whether the system supports Unicode.
+
+  bool isWinNT() 
+  {
+    OSVERSIONINFOA ver = {};
+    ver.dwOSVersionInfoSize = sizeof(OSVERSIONINFOA);
+    if(GetVersionExA(&ver)) {
+      return (ver.dwPlatformId == VER_PLATFORM_WIN32_NT);
+    }
+    else {
+      return false;
+    }
+  }
+  
+  const bool IsWinNT = isWinNT();
+
+  // Converts a UTF-16 string into a local encoding.
+
+  std::string unicodeToAnsi(const std::wstring &wstr)
+  {
+    const int len = WideCharToMultiByte(CP_ACP, 0, &wstr[0], -1, NULL, 0, NULL, NULL);
+    if(len == 0)
+      return std::string();
+
+    std::string str(len, '\0');
+    WideCharToMultiByte(CP_ACP, 0, &wstr[0], -1, &str[0], len, NULL, NULL);
+
+    return str;
+  }
+}
+
+// If WinNT, stores a Unicode string into m_wname directly.
+// If Win9x, converts and stores it into m_name to avoid calling Unicode version functions.
+
+FileName::FileName(const wchar_t *name) 
+  : m_wname(IsWinNT ? name : L"")
+  , m_name(IsWinNT ? "" : unicodeToAnsi(name))
+{
+}
+
+#else
+
+FileName::FileName(const wchar_t *name) 
+  : m_wname(name)
+{
+}
+
+#endif 
+
+FileName::FileName(const char *name) 
+  : m_name(name) 
+{
+}
+
+FileName::FileName(const FileName &name) 
+  : m_wname(name.m_wname)
+  , m_name(name.m_name) 
+{
+}
+
+FileName::operator const wchar_t *() const 
+{ 
+  return m_wname.c_str(); 
+}
+
+FileName::operator const char *() const 
+{ 
+  return m_name.c_str(); 
+}
+
+const std::wstring &FileName::wstr() const 
+{ 
+  return m_wname; 
+}
+
+const std::string &FileName::str() const 
+{ 
+  return m_name; 
+}  
+
+#endif
+
 ////////////////////////////////////////////////////////////////////////////////
 // public members
 ////////////////////////////////////////////////////////////////////////////////

taglib/toolkit/tiostream.h

@@ -36,17 +36,16 @@ namespace TagLib {
   class TAGLIB_EXPORT FileName
   {
   public:
-    FileName(const wchar_t *name) : m_wname(name) {}
-    FileName(const char *name) : m_name(name) {}
+    FileName(const wchar_t *name);
+    FileName(const char *name);
 
-    FileName(const FileName &name) 
-      : m_wname(name.m_wname), m_name(name.m_name) {}
+    FileName(const FileName &name);
 
-    operator const wchar_t *() const { return m_wname.c_str(); }
-    operator const char *() const { return m_name.c_str(); }
+    operator const wchar_t *() const;
+    operator const char *() const;
 
-    const std::wstring &wstr() const { return m_wname; }
-    const std::string  &str()  const { return m_name; }  
+    const std::wstring &wstr() const;
+    const std::string  &str() const; 
 
   private:
     const std::string  m_name;