bool TessdataManager::OverwriteComponents(
const char *new_traineddata_filename,
char **component_filenames,
int num_new_components) {
int i;
inT64 offset_table[TESSDATA_NUM_ENTRIES];
TessdataType type = TESSDATA_NUM_ENTRIES;
bool text_file = false;
FILE *file_ptr[TESSDATA_NUM_ENTRIES];
for (i = 0; i < TESSDATA_NUM_ENTRIES; ++i) {
offset_table[i] = -1;
file_ptr[i] = NULL;
}
FILE *output_file = fopen(new_traineddata_filename, "wb");
if (output_file == NULL) {
tprintf("Error opening %s for writing\n", new_traineddata_filename);
return false;
}
// Leave some space for recording the offset_table.
if (fseek(output_file,
sizeof(inT32) + sizeof(inT64) * TESSDATA_NUM_ENTRIES, SEEK_SET)) {
fclose(output_file);
tprintf("Error seeking %s\n", new_traineddata_filename);
return false;
}
// Open the files with the new components.
for (i = 0; i < num_new_components; ++i) {
if (TessdataTypeFromFileName(component_filenames[i], &type, &text_file))
file_ptr[type] = fopen(component_filenames[i], "rb");
}
// Write updated data to the output traineddata file.
for (i = 0; i < TESSDATA_NUM_ENTRIES; ++i) {
if (file_ptr[i] != NULL) {
// Get the data from the opened component file.
offset_table[i] = ftell(output_file);
CopyFile(file_ptr[i], output_file, kTessdataFileIsText[i], -1);
fclose(file_ptr[i]);
} else {
// Get this data component from the loaded data file.
if (SeekToStart(static_cast<TessdataType>(i))) {
offset_table[i] = ftell(output_file);
CopyFile(data_file_, output_file, kTessdataFileIsText[i],
GetEndOffset(static_cast<TessdataType>(i)) -
ftell(data_file_) + 1);
}
}
}
const char *language_data_path_prefix = strchr(new_traineddata_filename, '.');
return WriteMetadata(offset_table, language_data_path_prefix, output_file);
}
bool TessdataManager::OverwriteComponents(
const char *new_traineddata_filename,
char **component_filenames,
int num_new_components) {
// Open the files with the new components.
for (int i = 0; i < num_new_components; ++i) {
TessdataType type;
if (TessdataTypeFromFileName(component_filenames[i], &type)) {
if (!LoadDataFromFile(component_filenames[i], &entries_[type])) {
tprintf("Failed to read component file:%s\n", component_filenames[i]);
return false;
}
}
}
// Write updated data to the output traineddata file.
return SaveFile(new_traineddata_filename, nullptr);
}
