sdl_clip.cpp

 
#include <string>
#include <mutex>
#include <iterator>
#include <algorithm>
#include <utility>
 
#include <winpr/wlog.h>
 
#include "sdl_clip.hpp"
#include "sdl_freerdp.hpp"
 
#define TAG CLIENT_TAG("sdl.cliprdr")
 
#define mime_text_plain "text/plain"
#define mime_text_utf8 mime_text_plain ";charset=utf-8"
 
static const std::vector<const char*>& s_mime_text()
{
  static std::vector<const char*> values;
  if (values.empty())
  {
    values = std::vector<const char*>(
        { mime_text_plain, mime_text_utf8, "UTF8_STRING", "COMPOUND_TEXT", "TEXT", "STRING" });
  }
  return values;
}
 
static const char s_mime_png[] = "image/png";
static const char s_mime_webp[] = "image/webp";
static const char s_mime_jpg[] = "image/jpeg";
static const char s_mime_tiff[] = "image/tiff";
static const char s_mime_uri_list[] = "text/uri-list";
static const char s_mime_html[] = "text/html";
 
#define BMP_MIME_LIST "image/bmp", "image/x-bmp", "image/x-MS-bmp", "image/x-win-bitmap"
 
static const std::vector<const char*>& s_mime_bitmap()
{
  static std::vector<const char*> values;
  if (values.empty())
  {
    values = std::vector<const char*>({ BMP_MIME_LIST });
  }
  return values;
}
 
static const std::vector<const char*>& s_mime_image()
{
  static std::vector<const char*> values;
  if (values.empty())
  {
    values = std::vector<const char*>(
        { s_mime_png, s_mime_webp, s_mime_jpg, s_mime_tiff, BMP_MIME_LIST });
  }
  return values;
}
 
static const char s_mime_gnome_copied_files[] = "x-special/gnome-copied-files";
static const char s_mime_mate_copied_files[] = "x-special/mate-copied-files";
 
static const char* s_type_HtmlFormat = "HTML Format";
static const char* s_type_FileGroupDescriptorW = "FileGroupDescriptorW";
 
class ClipboardLockGuard
{
  public:
  explicit ClipboardLockGuard(wClipboard* clipboard) : _clipboard(clipboard)
  {
    ClipboardLock(_clipboard);
  }
  ClipboardLockGuard(const ClipboardLockGuard& other) = delete;
  ClipboardLockGuard(ClipboardLockGuard&& other) = delete;
 
  ClipboardLockGuard& operator=(const ClipboardLockGuard& rhs) = delete;
  ClipboardLockGuard& operator=(ClipboardLockGuard&& rhs) = delete;
 
  ~ClipboardLockGuard()
  {
    ClipboardUnlock(_clipboard);
  }
 
  private:
  wClipboard* _clipboard;
};
 
static bool operator<(const CLIPRDR_FORMAT& lhs, const CLIPRDR_FORMAT& rhs)
{
  return (lhs.formatId < rhs.formatId);
}
static bool operator>(const CLIPRDR_FORMAT& lhs, const CLIPRDR_FORMAT& rhs)
{
  return (lhs.formatId > rhs.formatId);
}
static bool operator==(const CLIPRDR_FORMAT& lhs, const CLIPRDR_FORMAT& rhs)
{
  return (lhs.formatId == rhs.formatId);
}
 
sdlClip::sdlClip(SdlContext* sdl)
    : _sdl(sdl), _file(cliprdr_file_context_new(this)), _log(WLog_Get(TAG)),
      _system(ClipboardCreate()), _event(CreateEventA(nullptr, TRUE, FALSE, nullptr))
{
  WINPR_ASSERT(sdl);
}
 
sdlClip::~sdlClip()
{
  cliprdr_file_context_free(_file);
  ClipboardDestroy(_system);
  (void)CloseHandle(_event);
}
 
BOOL sdlClip::init(CliprdrClientContext* clip)
{
  WINPR_ASSERT(clip);
  _ctx = clip;
  clip->custom = this;
  _ctx->MonitorReady = sdlClip::MonitorReady;
  _ctx->ServerCapabilities = sdlClip::ReceiveServerCapabilities;
  _ctx->ServerFormatList = sdlClip::ReceiveServerFormatList;
  _ctx->ServerFormatListResponse = sdlClip::ReceiveFormatListResponse;
  _ctx->ServerFormatDataRequest = sdlClip::ReceiveFormatDataRequest;
  _ctx->ServerFormatDataResponse = sdlClip::ReceiveFormatDataResponse;
 
  return cliprdr_file_context_init(_file, _ctx);
}
 
BOOL sdlClip::uninit(CliprdrClientContext* clip)
{
  WINPR_ASSERT(clip);
  if (!cliprdr_file_context_uninit(_file, _ctx))
    return FALSE;
  _ctx = nullptr;
  clip->custom = nullptr;
  return TRUE;
}
 
bool sdlClip::handle_update(const SDL_ClipboardEvent& ev)
{
  if (!_ctx || !_sync || ev.owner)
    return true;
 
  clearServerFormats();
 
  std::string mime_uri_list = "text/uri-list";
  std::string mime_html = "text/html";
 
  std::vector<std::string> mime_bitmap = { "image/bmp", "image/x-bmp", "image/x-MS-bmp",
                                         "image/x-win-bitmap" };
  std::string mime_webp = "image/webp";
  std::string mime_png = "image/png";
  std::string mime_jpeg = "image/jpeg";
  std::string mime_tiff = "image/tiff";
  std::vector<std::string> mime_images = { mime_webp, mime_png, mime_jpeg, mime_tiff };
 
  std::vector<std::string> clientFormatNames;
  std::vector<CLIPRDR_FORMAT> clientFormats;
 
  size_t nformats = ev.n_mime_types;
  const char** clipboard_mime_formats = ev.mime_types;
 
  WLog_Print(_log, WLOG_TRACE, "SDL has %d formats", nformats);
 
  bool textPushed = false;
  bool imgPushed = false;
 
  for (size_t i = 0; i < nformats; i++)
  {
    std::string local_mime = clipboard_mime_formats[i];
    WLog_Print(_log, WLOG_TRACE, " - %s", local_mime.c_str());
 
    if (std::find(s_mime_text().begin(), s_mime_text().end(), local_mime) !=
        s_mime_text().end())
    {
      /* text formats */
      if (!textPushed)
      {
        clientFormats.push_back({ CF_TEXT, nullptr });
        clientFormats.push_back({ CF_OEMTEXT, nullptr });
        clientFormats.push_back({ CF_UNICODETEXT, nullptr });
        textPushed = true;
      }
    }
    else if (local_mime == mime_html)
      /* html */
      clientFormatNames.emplace_back(s_type_HtmlFormat);
    else if (std::find(mime_bitmap.begin(), mime_bitmap.end(), local_mime) != mime_bitmap.end())
    {
      /* image formats */
      if (!imgPushed)
      {
        clientFormats.push_back({ CF_DIB, nullptr });
        clientFormats.push_back({ CF_DIBV5, nullptr });
 
        for (auto& bmp : mime_bitmap)
          clientFormatNames.push_back(bmp);
 
        for (auto& img : mime_images)
          clientFormatNames.push_back(img);
 
        imgPushed = true;
      }
    }
  }
 
  for (auto& name : clientFormatNames)
  {
    clientFormats.push_back({ ClipboardRegisterFormat(_system, name.c_str()), name.data() });
  }
 
  std::sort(clientFormats.begin(), clientFormats.end(),
            [](const auto& a, const auto& b) { return a < b; });
  auto u = std::unique(clientFormats.begin(), clientFormats.end());
  clientFormats.erase(u, clientFormats.end());
 
  const CLIPRDR_FORMAT_LIST formatList = {
    .common = { .msgType = CB_FORMAT_LIST, .msgFlags = 0, .dataLen = 0 },
    .numFormats = static_cast<UINT32>(clientFormats.size()),
    .formats = clientFormats.data(),
  };
 
  WLog_Print(_log, WLOG_TRACE,
             "-------------- client format list [%" PRIu32 "] ------------------",
             formatList.numFormats);
  for (UINT32 x = 0; x < formatList.numFormats; x++)
  {
    auto format = &formatList.formats[x];
    WLog_Print(_log, WLOG_TRACE, "client announces %" PRIu32 " [%s][%s]", format->formatId,
               ClipboardGetFormatIdString(format->formatId), format->formatName);
  }
 
  WINPR_ASSERT(_ctx);
  WINPR_ASSERT(_ctx->ClientFormatList);
  return _ctx->ClientFormatList(_ctx, &formatList) == CHANNEL_RC_OK;
}
 
UINT sdlClip::MonitorReady(CliprdrClientContext* context, const CLIPRDR_MONITOR_READY* monitorReady)
{
  WINPR_UNUSED(monitorReady);
  WINPR_ASSERT(context);
  WINPR_ASSERT(monitorReady);
 
  auto clipboard = static_cast<sdlClip*>(
      cliprdr_file_context_get_context(static_cast<CliprdrFileContext*>(context->custom)));
  WINPR_ASSERT(clipboard);
 
  auto ret = clipboard->SendClientCapabilities();
  if (ret != CHANNEL_RC_OK)
    return ret;
 
  clipboard->_sync = true;
  SDL_ClipboardEvent ev = { SDL_EVENT_CLIPBOARD_UPDATE, 0, 0, false, 0, nullptr };
  if (!clipboard->handle_update(ev))
    return ERROR_INTERNAL_ERROR;
 
  return CHANNEL_RC_OK;
}
 
UINT sdlClip::SendClientCapabilities()
{
  CLIPRDR_GENERAL_CAPABILITY_SET generalCapabilitySet = {
    .capabilitySetType = CB_CAPSTYPE_GENERAL,
    .capabilitySetLength = 12,
    .version = CB_CAPS_VERSION_2,
    .generalFlags = CB_USE_LONG_FORMAT_NAMES | cliprdr_file_context_current_flags(_file)
  };
  CLIPRDR_CAPABILITIES capabilities = {
    .common = { .msgType = CB_TYPE_NONE, .msgFlags = 0, .dataLen = 0 },
    .cCapabilitiesSets = 1,
    .capabilitySets = reinterpret_cast<CLIPRDR_CAPABILITY_SET*>(&generalCapabilitySet)
  };
 
  WINPR_ASSERT(_ctx);
  WINPR_ASSERT(_ctx->ClientCapabilities);
  return _ctx->ClientCapabilities(_ctx, &capabilities);
}
 
void sdlClip::clearServerFormats()
{
  _serverFormats.clear();
  cliprdr_file_context_clear(_file);
}
 
UINT sdlClip::SendFormatListResponse(BOOL status)
{
  const CLIPRDR_FORMAT_LIST_RESPONSE formatListResponse = {
    .common = { .msgType = CB_FORMAT_LIST_RESPONSE,
                .msgFlags = static_cast<UINT16>(status ? CB_RESPONSE_OK : CB_RESPONSE_FAIL),
                .dataLen = 0 }
  };
  WINPR_ASSERT(_ctx);
  WINPR_ASSERT(_ctx->ClientFormatListResponse);
  return _ctx->ClientFormatListResponse(_ctx, &formatListResponse);
}
 
UINT sdlClip::SendDataResponse(const BYTE* data, size_t size)
{
  CLIPRDR_FORMAT_DATA_RESPONSE response = {};
 
  if (size > UINT32_MAX)
    return ERROR_INVALID_PARAMETER;
 
  response.common.msgFlags = (data) ? CB_RESPONSE_OK : CB_RESPONSE_FAIL;
  response.common.dataLen = static_cast<UINT32>(size);
  response.requestedFormatData = data;
 
  WINPR_ASSERT(_ctx);
  WINPR_ASSERT(_ctx->ClientFormatDataResponse);
  return _ctx->ClientFormatDataResponse(_ctx, &response);
}
 
UINT sdlClip::SendDataRequest(uint32_t formatID, const std::string& mime)
{
  CLIPRDR_FORMAT_DATA_REQUEST request = {
    .common = { .msgType = CB_TYPE_NONE, .msgFlags = 0, .dataLen = 0 },
    .requestedFormatId = formatID
  };
 
  _request_queue.push({ formatID, mime });
 
  WINPR_ASSERT(_ctx);
  WINPR_ASSERT(_ctx->ClientFormatDataRequest);
  UINT ret = _ctx->ClientFormatDataRequest(_ctx, &request);
  if (ret != CHANNEL_RC_OK)
  {
    WLog_Print(_log, WLOG_ERROR, "error sending ClientFormatDataRequest, cancelling request");
    _request_queue.pop();
  }
 
  return ret;
}
 
std::string sdlClip::getServerFormat(uint32_t id)
{
  for (auto& fmt : _serverFormats)
  {
    if (fmt.formatId() == id)
    {
      if (fmt.formatName())
        return fmt.formatName();
      break;
    }
  }
 
  return "";
}
 
uint32_t sdlClip::serverIdForMime(const std::string& mime)
{
  std::string cmp = mime;
  if (mime_is_html(mime))
    cmp = s_type_HtmlFormat;
  if (mime_is_file(mime))
    cmp = s_type_FileGroupDescriptorW;
 
  for (auto& format : _serverFormats)
  {
    if (!format.formatName())
      continue;
    if (cmp == format.formatName())
      return format.formatId();
  }
 
  if (mime_is_image(mime))
    return CF_DIB;
  if (mime_is_text(mime))
    return CF_UNICODETEXT;
 
  return 0;
}
 
UINT sdlClip::ReceiveServerCapabilities(CliprdrClientContext* context,
                                        const CLIPRDR_CAPABILITIES* capabilities)
{
  WINPR_ASSERT(context);
  WINPR_ASSERT(capabilities);
 
  auto capsPtr = reinterpret_cast<const BYTE*>(capabilities->capabilitySets);
  WINPR_ASSERT(capsPtr);
 
  auto clipboard = static_cast<sdlClip*>(
      cliprdr_file_context_get_context(static_cast<CliprdrFileContext*>(context->custom)));
  WINPR_ASSERT(clipboard);
 
  if (!cliprdr_file_context_remote_set_flags(clipboard->_file, 0))
    return ERROR_INTERNAL_ERROR;
 
  for (UINT32 i = 0; i < capabilities->cCapabilitiesSets; i++)
  {
    auto caps = reinterpret_cast<const CLIPRDR_CAPABILITY_SET*>(capsPtr);
 
    if (caps->capabilitySetType == CB_CAPSTYPE_GENERAL)
    {
      auto generalCaps = reinterpret_cast<const CLIPRDR_GENERAL_CAPABILITY_SET*>(caps);
 
      if (!cliprdr_file_context_remote_set_flags(clipboard->_file, generalCaps->generalFlags))
        return ERROR_INTERNAL_ERROR;
    }
 
    capsPtr += caps->capabilitySetLength;
  }
 
  return CHANNEL_RC_OK;
}
 
UINT sdlClip::ReceiveServerFormatList(CliprdrClientContext* context,
                                      const CLIPRDR_FORMAT_LIST* formatList)
{
  BOOL html = FALSE;
  BOOL text = FALSE;
  BOOL image = FALSE;
  BOOL file = FALSE;
 
  if (!context || !context->custom)
    return ERROR_INVALID_PARAMETER;
 
  auto clipboard = static_cast<sdlClip*>(
      cliprdr_file_context_get_context(static_cast<CliprdrFileContext*>(context->custom)));
  WINPR_ASSERT(clipboard);
 
  clipboard->clearServerFormats();
 
  for (UINT32 i = 0; i < formatList->numFormats; i++)
  {
    const CLIPRDR_FORMAT* format = &formatList->formats[i];
 
    clipboard->_serverFormats.emplace_back(format->formatId, format->formatName);
 
    if (format->formatName)
    {
      if (strcmp(format->formatName, s_type_HtmlFormat) == 0)
      {
        text = TRUE;
        html = TRUE;
      }
      else if (strcmp(format->formatName, s_type_FileGroupDescriptorW) == 0)
      {
        file = TRUE;
        text = TRUE;
      }
    }
    else
    {
      switch (format->formatId)
      {
        case CF_TEXT:
        case CF_OEMTEXT:
        case CF_UNICODETEXT:
          text = TRUE;
          break;
 
        case CF_DIB:
          image = TRUE;
          break;
 
        default:
          break;
      }
    }
  }
 
  std::vector<const char*> mimetypes;
  if (text)
  {
    mimetypes.insert(mimetypes.end(), s_mime_text().begin(), s_mime_text().end());
  }
  if (image)
  {
    mimetypes.insert(mimetypes.end(), s_mime_bitmap().begin(), s_mime_bitmap().end());
    mimetypes.insert(mimetypes.end(), s_mime_image().begin(), s_mime_image().end());
  }
  if (html)
  {
    mimetypes.push_back(s_mime_html);
  }
  if (file)
  {
    mimetypes.push_back(s_mime_uri_list);
    mimetypes.push_back(s_mime_gnome_copied_files);
    mimetypes.push_back(s_mime_mate_copied_files);
  }
 
  const bool rc = SDL_SetClipboardData(sdlClip::ClipDataCb, sdlClip::ClipCleanCb, clipboard,
                                       mimetypes.data(), mimetypes.size());
  return clipboard->SendFormatListResponse(rc);
}
 
UINT sdlClip::ReceiveFormatListResponse(CliprdrClientContext* context,
                                        const CLIPRDR_FORMAT_LIST_RESPONSE* formatListResponse)
{
  WINPR_ASSERT(context);
  WINPR_ASSERT(formatListResponse);
 
  if (formatListResponse->common.msgFlags & CB_RESPONSE_FAIL)
    WLog_WARN(TAG, "format list update failed");
  return CHANNEL_RC_OK;
}
 
std::shared_ptr<BYTE> sdlClip::ReceiveFormatDataRequestHandle(
    sdlClip* clipboard, const CLIPRDR_FORMAT_DATA_REQUEST* formatDataRequest, uint32_t& len)
{
  const char* mime = nullptr;
  UINT32 formatId = 0;
 
  BOOL res = FALSE;
 
  std::shared_ptr<BYTE> data;
 
  WINPR_ASSERT(clipboard);
  WINPR_ASSERT(formatDataRequest);
 
  len = 0;
  auto localFormatId = formatId = formatDataRequest->requestedFormatId;
 
  ClipboardLockGuard give_me_a_name(clipboard->_system);
  std::lock_guard<CriticalSection> lock(clipboard->_lock);
 
  const UINT32 fileFormatId =
      ClipboardGetFormatId(clipboard->_system, s_type_FileGroupDescriptorW);
  const UINT32 htmlFormatId = ClipboardGetFormatId(clipboard->_system, s_type_HtmlFormat);
 
  switch (formatId)
  {
    case CF_TEXT:
    case CF_OEMTEXT:
    case CF_UNICODETEXT:
      localFormatId = ClipboardGetFormatId(clipboard->_system, mime_text_plain);
      mime = mime_text_utf8;
      break;
 
    case CF_DIB:
    case CF_DIBV5:
      mime = s_mime_bitmap()[0];
      break;
 
    case CF_TIFF:
      mime = s_mime_tiff;
      break;
 
    default:
      if (formatId == fileFormatId)
      {
        localFormatId = ClipboardGetFormatId(clipboard->_system, s_mime_uri_list);
        mime = s_mime_uri_list;
      }
      else if (formatId == htmlFormatId)
      {
        localFormatId = ClipboardGetFormatId(clipboard->_system, s_mime_html);
        mime = s_mime_html;
      }
      else
        return data;
  }
 
  {
    size_t size = 0;
    auto sdldata = std::shared_ptr<void>(SDL_GetClipboardData(mime, &size), SDL_free);
    if (!sdldata)
      return data;
 
    if (fileFormatId == formatId)
    {
      auto bdata = static_cast<const char*>(sdldata.get());
      if (!cliprdr_file_context_update_client_data(clipboard->_file, bdata, size))
        return data;
    }
 
    res = ClipboardSetData(clipboard->_system, localFormatId, sdldata.get(),
                           static_cast<uint32_t>(size));
  }
 
  if (!res)
    return data;
 
  uint32_t ptrlen = 0;
  auto ptr = static_cast<BYTE*>(ClipboardGetData(clipboard->_system, formatId, &ptrlen));
  data = std::shared_ptr<BYTE>(ptr, free);
 
  if (!data)
    return data;
 
  if (fileFormatId == formatId)
  {
    BYTE* ddata = nullptr;
    UINT32 dsize = 0;
    const UINT32 flags = cliprdr_file_context_remote_get_flags(clipboard->_file);
    const UINT32 error = cliprdr_serialize_file_list_ex(
        flags, reinterpret_cast<const FILEDESCRIPTORW*>(data.get()),
        ptrlen / sizeof(FILEDESCRIPTORW), &ddata, &dsize);
    data.reset();
    auto tmp = std::shared_ptr<BYTE>(ddata, free);
    if (error)
      return data;
 
    data = tmp;
    len = dsize;
  }
  else
    len = ptrlen;
  return data;
}
 
UINT sdlClip::ReceiveFormatDataRequest(CliprdrClientContext* context,
                                       const CLIPRDR_FORMAT_DATA_REQUEST* formatDataRequest)
{
  WINPR_ASSERT(context);
  WINPR_ASSERT(formatDataRequest);
 
  auto clipboard = static_cast<sdlClip*>(
      cliprdr_file_context_get_context(static_cast<CliprdrFileContext*>(context->custom)));
  WINPR_ASSERT(clipboard);
 
  uint32_t len = 0;
  auto rc = ReceiveFormatDataRequestHandle(clipboard, formatDataRequest, len);
  return clipboard->SendDataResponse(rc.get(), len);
}
 
UINT sdlClip::ReceiveFormatDataResponse(CliprdrClientContext* context,
                                        const CLIPRDR_FORMAT_DATA_RESPONSE* formatDataResponse)
{
  WINPR_ASSERT(context);
  WINPR_ASSERT(formatDataResponse);
 
  const UINT32 size = formatDataResponse->common.dataLen;
  const BYTE* data = formatDataResponse->requestedFormatData;
 
  auto clipboard = static_cast<sdlClip*>(
      cliprdr_file_context_get_context(static_cast<CliprdrFileContext*>(context->custom)));
  WINPR_ASSERT(clipboard);
 
  ClipboardLockGuard give_me_a_name(clipboard->_system);
  std::lock_guard<CriticalSection> lock(clipboard->_lock);
  if (clipboard->_request_queue.empty())
  {
    WLog_Print(clipboard->_log, WLOG_ERROR, "no pending format request");
    return ERROR_INTERNAL_ERROR;
  }
 
  do
  {
    UINT32 srcFormatId = 0;
    auto& request = clipboard->_request_queue.front();
    bool success = (formatDataResponse->common.msgFlags & CB_RESPONSE_OK) &&
                   !(formatDataResponse->common.msgFlags & CB_RESPONSE_FAIL);
    request.setSuccess(success);
 
    if (!success)
    {
      WLog_Print(clipboard->_log, WLOG_WARN,
                 "clipboard data request for format %" PRIu32 " [%s], mime %s failed",
                 request.format(), request.formatstr().c_str(), request.mime().c_str());
      break;
    }
 
    switch (request.format())
    {
      case CF_TEXT:
      case CF_OEMTEXT:
      case CF_UNICODETEXT:
        srcFormatId = request.format();
        break;
 
      case CF_DIB:
      case CF_DIBV5:
        srcFormatId = request.format();
        break;
 
      default:
      {
        auto name = clipboard->getServerFormat(request.format());
        if (!name.empty())
        {
          if (name == s_type_FileGroupDescriptorW)
          {
            srcFormatId =
                ClipboardGetFormatId(clipboard->_system, s_type_FileGroupDescriptorW);
 
            if (!cliprdr_file_context_update_server_data(
                    clipboard->_file, clipboard->_system, data, size))
              return ERROR_INTERNAL_ERROR;
          }
          else if (name == s_type_HtmlFormat)
          {
            srcFormatId = ClipboardGetFormatId(clipboard->_system, s_type_HtmlFormat);
          }
        }
      }
      break;
    }
 
    if (!ClipboardSetData(clipboard->_system, srcFormatId, data, size))
    {
      WLog_Print(clipboard->_log, WLOG_ERROR, "error when setting clipboard data");
      return ERROR_INTERNAL_ERROR;
    }
  } while (false);
 
  if (!SetEvent(clipboard->_event))
    return ERROR_INTERNAL_ERROR;
 
  return CHANNEL_RC_OK;
}
 
const void* sdlClip::ClipDataCb(void* userdata, const char* mime_type, size_t* size)
{
  auto clip = static_cast<sdlClip*>(userdata);
  WINPR_ASSERT(clip);
  WINPR_ASSERT(size);
  WINPR_ASSERT(mime_type);
 
  *size = 0;
  uint32_t len = 0;
 
  if (mime_is_text(mime_type))
    mime_type = "text/plain";
 
  {
    ClipboardLockGuard give_me_a_name(clip->_system);
    std::lock_guard<CriticalSection> lock(clip->_lock);
    auto cache = clip->_cache_data.find(mime_type);
    if (cache != clip->_cache_data.end())
    {
      *size = cache->second.size;
      return cache->second.ptr.get();
    }
 
    uint32_t formatID = clip->serverIdForMime(mime_type);
    if (clip->SendDataRequest(formatID, mime_type))
      return nullptr;
  }
 
  {
    HANDLE hdl[2] = { freerdp_abort_event(clip->_sdl->context()), clip->_event };
 
    // Unlock the sdl->critical lock or we'll deadlock with the FreeRDP thread
    // when it pushes events (like end_paint).
    // we can safely do that here as we're called from the SDL thread
    SdlContext* sdl = clip->_sdl;
    sdl->critical.unlock();
 
    DWORD status = WaitForMultipleObjects(ARRAYSIZE(hdl), hdl, FALSE, 10 * 1000);
 
    sdl->critical.lock();
 
    if (status != WAIT_OBJECT_0 + 1)
    {
      std::lock_guard<CriticalSection> lock(clip->_lock);
      clip->_request_queue.pop();
 
      if (status == WAIT_TIMEOUT)
        WLog_Print(clip->_log, WLOG_ERROR,
                   "no reply in 10 seconds, returning empty content");
 
      return nullptr;
    }
  }
 
  {
    ClipboardLockGuard give_me_a_name(clip->_system);
    std::lock_guard<CriticalSection> lock(clip->_lock);
    auto request = clip->_request_queue.front();
    clip->_request_queue.pop();
 
    if (!clip->_request_queue.size())
      (void)ResetEvent(clip->_event);
 
    if (request.success())
    {
      auto formatID = ClipboardRegisterFormat(clip->_system, mime_type);
      auto data = ClipboardGetData(clip->_system, formatID, &len);
      if (!data)
      {
        WLog_Print(clip->_log, WLOG_ERROR, "error retrieving clipboard data");
        return nullptr;
      }
 
      auto ptr = std::shared_ptr<void>(data, free);
      clip->_cache_data.insert({ mime_type, { len, ptr } });
      *size = len;
      return ptr.get();
    }
 
    return nullptr;
  }
}
 
void sdlClip::ClipCleanCb(void* userdata)
{
  auto clip = static_cast<sdlClip*>(userdata);
  WINPR_ASSERT(clip);
  ClipboardLockGuard give_me_a_name(clip->_system);
  std::lock_guard<CriticalSection> lock(clip->_lock);
  ClipboardEmpty(clip->_system);
  clip->_cache_data.clear();
}
 
bool sdlClip::mime_is_file(const std::string& mime)
{
  if (strncmp(s_mime_uri_list, mime.c_str(), sizeof(s_mime_uri_list)) == 0)
    return true;
  if (strncmp(s_mime_gnome_copied_files, mime.c_str(), sizeof(s_mime_gnome_copied_files)) == 0)
    return true;
  if (strncmp(s_mime_mate_copied_files, mime.c_str(), sizeof(s_mime_mate_copied_files)) == 0)
    return true;
  return false;
}
 
bool sdlClip::mime_is_text(const std::string& mime)
{
  for (const auto& tmime : s_mime_text())
  {
    assert(tmime != nullptr);
    if (mime == tmime)
      return true;
  }
 
  return false;
}
 
bool sdlClip::mime_is_image(const std::string& mime)
{
  for (const auto& imime : s_mime_image())
  {
    assert(imime != nullptr);
    if (mime == imime)
      return true;
  }
 
  return false;
}
 
bool sdlClip::mime_is_html(const std::string& mime)
{
  return mime.compare(s_mime_html) == 0;
}
 
ClipRequest::ClipRequest(UINT32 format, const std::string& mime)
    : _format(format), _mime(mime), _success(false)
{
}
 
uint32_t ClipRequest::format() const
{
  return _format;
}
 
std::string ClipRequest::formatstr() const
{
  return ClipboardGetFormatIdString(_format);
}
 
std::string ClipRequest::mime() const
{
  return _mime;
}
 
bool ClipRequest::success() const
{
  return _success;
}
 
void ClipRequest::setSuccess(bool status)
{
  _success = status;
}