// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

#include "platform/globals.h"
#if defined(DART_HOST_OS_WINDOWS)

#include "bin/extensions.h"
#include "bin/utils.h"
#include "bin/utils_win.h"
#include "platform/assert.h"

namespace dart {
namespace bin {

void* Extensions::LoadExtensionLibrary(const char* library_file) {
  SetLastError(0);

  // Convert to wchar_t string.
  int name_len = MultiByteToWideChar(CP_UTF8, 0, library_file, -1, NULL, 0);
  wchar_t* name;
  name = new wchar_t[name_len];
  MultiByteToWideChar(CP_UTF8, 0, library_file, -1, name, name_len);

  void* ext = LoadLibraryW(name);
  delete[] name;
  return ext;
}

void* Extensions::ResolveSymbol(void* lib_handle, const char* symbol) {
  SetLastError(0);
  return reinterpret_cast<void*>(
      GetProcAddress(reinterpret_cast<HMODULE>(lib_handle), symbol));
}

void Extensions::UnloadLibrary(void* lib_handle) {
  SetLastError(0);
  BOOL result = FreeLibrary(reinterpret_cast<HMODULE>(lib_handle));
  ASSERT(result);
}

Dart_Handle Extensions::GetError() {
  int last_error = GetLastError();
  if (last_error != 0) {
    OSError err;
    return Dart_NewApiError(err.message());
  }
  return Dart_Null();
}

}  // namespace bin
}  // namespace dart

#endif  // defined(DART_HOST_OS_WINDOWS)