library_loader_win.cpp

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/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "../../stdafx.h"
 
#include <windows.h>
 
#include "../../library_loader.h"
#include "../../3rdparty/fmt/format.h"
 
#include "../../safeguards.h"
 
static std::string GetLoadError()
{
  auto error_code = GetLastError();
 
  wchar_t buffer[512];
  if (FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, nullptr, error_code,
    MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), buffer, static_cast<DWORD>(std::size(buffer)), nullptr) == 0) {
    return fmt::format("Unknown error {}", error_code);
  }
 
  return FS2OTTD(buffer);
}
 
void *LibraryLoader::OpenLibrary(const std::string &filename)
{
  void *h = ::LoadLibraryW(OTTD2FS(filename).c_str());
  if (h == nullptr) {
    this->error = GetLoadError();
  }
 
  return h;
}
 
void LibraryLoader::CloseLibrary()
{
  HMODULE handle = static_cast<HMODULE>(this->handle);
 
  ::FreeLibrary(handle);
}
 
void *LibraryLoader::GetSymbol(const std::string &symbol_name)
{
  HMODULE handle = static_cast<HMODULE>(this->handle);
 
  void *p = reinterpret_cast<void *>(::GetProcAddress(handle, symbol_name.c_str()));
  if (p == nullptr) {
    this->error = GetLoadError();
  }
 
  return p;
}