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///////////////////////////////////////////////////////////////////////
// File: tessdatamanager.cpp
// Description: Functions to handle loading/combining tesseract data files.
// Author: Daria Antonova
// Created: Wed Jun 03 11:26:43 PST 2009
//
// (C) Copyright 2009, Google Inc.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
///////////////////////////////////////////////////////////////////////
#include "tessdatamanager.h"
#include <stdio.h>
#include "serialis.h"
#include "strngs.h"
#include "tprintf.h"
#include "varable.h"
BOOL_VAR(global_load_system_dawg, true, "Load system word dawg.");
BOOL_VAR(global_load_freq_dawg, true, "Load frequent word dawg.");
BOOL_VAR(global_load_punc_dawg, true, "Load dawg with punctuation patterns.");
BOOL_VAR(global_load_number_dawg, true, "Load dawg with number patterns.");
INT_VAR(global_tessdata_manager_debug_level, 0,
"Debug level for TessdataManager functions.");
namespace tesseract {
void TessdataManager::Init(const char *data_file_name) {
int i;
data_file_ = fopen(data_file_name, "rb");
if (data_file_ == NULL) {
tprintf("Error openning data file %s\n", data_file_name);
exit(1);
}
fread(&actual_tessdata_num_entries_, sizeof(inT32), 1, data_file_);
bool swap = (actual_tessdata_num_entries_ > kMaxNumTessdataEntries);
if (swap) {
actual_tessdata_num_entries_ = reverse32(actual_tessdata_num_entries_);
}
ASSERT_HOST(actual_tessdata_num_entries_ <= TESSDATA_NUM_ENTRIES);
fread(offset_table_, sizeof(inT64),
actual_tessdata_num_entries_, data_file_);
if (swap) {
for (i = 0 ; i < actual_tessdata_num_entries_; ++i) {
offset_table_[i] = reverse64(offset_table_[i]);
}
}
if (global_tessdata_manager_debug_level) {
tprintf("TessdataManager loaded %d types of tesseract data files.\n",
actual_tessdata_num_entries_);
for (i = 0; i < actual_tessdata_num_entries_; ++i) {
tprintf("Offset for type %d is %lld\n", i, offset_table_[i]);
}
}
}
FILE *TessdataManager::GetFilePtr(const char *language_data_path_prefix,
const char *file_suffix, bool required_file,
bool text_file) {
STRING file_name = language_data_path_prefix;
file_name += file_suffix;
FILE *file_ptr = fopen(file_name.string(), text_file ? "r" : "rb");
if (required_file && (file_ptr == NULL)) {
tprintf("Error openning required file %s\n", file_name.string());
exit(1);
}
return file_ptr;
}
void TessdataManager::CopyFile(FILE *input_file, FILE *output_file,
bool newline_end) {
int buffer_size = 1024;
char *chunk = new char[buffer_size];
int bytes_read;
char last_char = 0x0;
while ((bytes_read = fread(chunk, sizeof(char),
buffer_size, input_file))) {
fwrite(chunk, sizeof(char), bytes_read, output_file);
last_char = chunk[bytes_read-1];
}
if (newline_end) ASSERT_HOST(last_char == '\n');
delete[] chunk;
}
void TessdataManager::CombineDataFiles(
const char *language_data_path_prefix,
const char *output_filename) {
FILE *file_ptr;
STRING file_name;
int i;
inT64 offset_table[TESSDATA_NUM_ENTRIES];
for (i = 0; i < TESSDATA_NUM_ENTRIES; ++i) offset_table[i] = -1;
FILE *output_file = fopen(output_filename, "wb");
// Leave some space for recording the offset_table.
fseek(output_file,
sizeof(inT32) + sizeof(inT64) * TESSDATA_NUM_ENTRIES, SEEK_SET);
// Record language-specific tesseract config file.
file_ptr = GetFilePtr(language_data_path_prefix,
kLangConfigFileSuffix, false, true);
if (file_ptr != NULL) {
offset_table[TESSDATA_LANG_CONFIG] = ftell(output_file);
CopyFile(file_ptr, output_file, true);
fclose(file_ptr);
}
// Record unicharset.
file_ptr = GetFilePtr(language_data_path_prefix,
kUnicharsetFileSuffix, true, true);
offset_table[TESSDATA_UNICHARSET] = ftell(output_file);
CopyFile(file_ptr, output_file, true);
fclose(file_ptr);
// Record ambiguities.
file_ptr = GetFilePtr(language_data_path_prefix,
kAmbigsFileSuffix, false, true);
if (file_ptr != NULL) {
offset_table[TESSDATA_AMBIGS] = ftell(output_file);
CopyFile(file_ptr, output_file, true);
fclose(file_ptr);
}
// Record inttemp.
file_ptr =
GetFilePtr(language_data_path_prefix,
kBuiltInTemplatesFileSuffix, false, false);
if (file_ptr != NULL) {
offset_table[TESSDATA_INTTEMP] = ftell(output_file);
CopyFile(file_ptr, output_file, false);
fclose(file_ptr);
// Record pffmtable.
file_ptr = GetFilePtr(language_data_path_prefix,
kBuiltInCutoffsFileSuffix, true, true);
offset_table[TESSDATA_PFFMTABLE] = ftell(output_file);
CopyFile(file_ptr, output_file, true);
fclose(file_ptr);
// Record normproto.
file_ptr = GetFilePtr(language_data_path_prefix,
kNormProtoFileSuffix, true, true);
offset_table[TESSDATA_NORMPROTO] = ftell(output_file);
CopyFile(file_ptr, output_file, true);
fclose(file_ptr);
}
// Record dawgs.
file_ptr = GetFilePtr(language_data_path_prefix,
kPuncDawgFileSuffix, false, false);
if (file_ptr != NULL) {
offset_table[TESSDATA_PUNC_DAWG] = ftell(output_file);
CopyFile(file_ptr, output_file, false);
fclose(file_ptr);
}
file_ptr = GetFilePtr(language_data_path_prefix,
kSystemDawgFileSuffix, false, false);
if (file_ptr != NULL) {
offset_table[TESSDATA_SYSTEM_DAWG] = ftell(output_file);
CopyFile(file_ptr, output_file, false);
fclose(file_ptr);
}
file_ptr = GetFilePtr(language_data_path_prefix,
kNumberDawgFileSuffix, false, false);
if (file_ptr != NULL) {
offset_table[TESSDATA_NUMBER_DAWG] = ftell(output_file);
CopyFile(file_ptr, output_file, false);
fclose(file_ptr);
}
file_ptr = GetFilePtr(language_data_path_prefix,
kFreqDawgFileSuffix, false, false);
if (file_ptr != NULL) {
offset_table[TESSDATA_FREQ_DAWG] = ftell(output_file);
CopyFile(file_ptr, output_file, false);
fclose(file_ptr);
}
fseek(output_file, 0, SEEK_SET);
inT32 num_entries = TESSDATA_NUM_ENTRIES;
fwrite(&num_entries, sizeof(inT32), 1, output_file);
fwrite(offset_table, sizeof(inT64), TESSDATA_NUM_ENTRIES, output_file);
fclose(output_file);
tprintf("TessdataManager combined tesseract data files.\n");
for (i = 0; i < TESSDATA_NUM_ENTRIES; ++i) {
tprintf("Offset for type %d is %lld\n", i, offset_table[i]);
}
}
} // namespace tesseract
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