C++ (Cpp) TFile::set_swap Examples

Example #1

File: tessdatamanager.cpp Project: CDOcr/tesseract

// Loads from the given memory buffer as if a file.
bool TessdataManager::LoadMemBuffer(const char *name, const char *data,
                                    int size) {
  Clear();
  data_file_name_ = name;
  TFile fp;
  fp.Open(data, size);
  uint32_t num_entries;
  if (!fp.DeSerialize(&num_entries)) return false;
  swap_ = num_entries > kMaxNumTessdataEntries;
  fp.set_swap(swap_);
  if (swap_) ReverseN(&num_entries, sizeof(num_entries));
  if (num_entries > kMaxNumTessdataEntries) return false;
  GenericVector<int64_t> offset_table;
  offset_table.resize_no_init(num_entries);
  if (!fp.DeSerialize(&offset_table[0], num_entries)) return false;
  for (int i = 0; i < num_entries && i < TESSDATA_NUM_ENTRIES; ++i) {
    if (offset_table[i] >= 0) {
      int64_t entry_size = size - offset_table[i];
      int j = i + 1;
      while (j < num_entries && offset_table[j] == -1) ++j;
      if (j < num_entries) entry_size = offset_table[j] - offset_table[i];
      entries_[i].resize_no_init(entry_size);
      if (!fp.DeSerialize(&entries_[i][0], entry_size)) return false;
    }
  }
  if (entries_[TESSDATA_VERSION].empty()) {
    SetVersionString("Pre-4.0.0");
  }
  is_loaded_ = true;
  return true;
}