add winmain.h to fix build

winmain.h

@@ -0,0 +1,69 @@
+//
+//  CRF++ -- Yet Another CRF toolkit
+//
+//  $Id: common.h 1588 2007-02-12 09:03:39Z taku $;
+//
+//  Copyright(C) 2005-2007 Taku Kudo <[email protected]>
+//
+#if defined(_WIN32) || defined(__CYGWIN__)
+
+#include <windows.h>
+#include <string>
+
+namespace {
+class CommandLine {
+ public:
+  CommandLine(int argc, wchar_t **argv) : argc_(argc), argv_(0) {
+    argv_ = new char * [argc_];
+    for (int i = 0; i < argc_; ++i) {
+      const std::string arg = WideToUtf8(argv[i]);
+      argv_[i] = new char[arg.size() + 1];
+      ::memcpy(argv_[i], arg.data(), arg.size());
+      argv_[i][arg.size()] = '\0';
+    }
+  }
+  ~CommandLine() {
+    for (int i = 0; i < argc_; ++i) {
+      delete [] argv_[i];
+    }
+    delete [] argv_;
+  }
+
+  int argc() const { return argc_; }
+  char **argv() const { return argv_; }
+
+ private:
+  static std::string WideToUtf8(const std::wstring &input) {
+    const int output_length = ::WideCharToMultiByte(CP_UTF8, 0,
+                                                    input.c_str(), -1, NULL, 0,
+                                                    NULL, NULL);
+    if (output_length == 0) {
+      return "";
+    }
+
+    char *input_encoded = new char[output_length + 1];
+    const int result = ::WideCharToMultiByte(CP_UTF8, 0, input.c_str(), -1,
+                                             input_encoded,
+                                             output_length + 1, NULL, NULL);
+    std::string output;
+    if (result > 0) {
+      output.assign(input_encoded);
+    }
+    delete [] input_encoded;
+    return output;
+  }
+
+  int argc_;
+  char **argv_;
+};
+}  // namespace
+
+#define main(argc, argv) wmain_to_main_wrapper(argc, argv)
+
+int wmain_to_main_wrapper(int argc, char **argv);
+
+int wmain(int argc, wchar_t **argv) {
+  CommandLine cmd(argc, argv);
+  return wmain_to_main_wrapper(cmd.argc(), cmd.argv());
+}
+#endif