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https://github.com/tesseract-ocr/tesseract.git
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109 lines
3.3 KiB
C++
109 lines
3.3 KiB
C++
///////////////////////////////////////////////////////////////////////
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// File: dawg_cache.h
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// Description: A class that knows about loading and caching dawgs.
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// Author: David Eger
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// Created: Fri Jan 27 12:08:00 PST 2012
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//
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// (C) Copyright 2012, Google Inc.
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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///////////////////////////////////////////////////////////////////////
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#include "dawg_cache.h"
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#include "dawg.h"
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#include "object_cache.h"
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#include "strngs.h"
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#include "tessdatamanager.h"
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namespace tesseract {
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struct DawgLoader {
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DawgLoader(const STRING &lang,
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const char *data_file_name,
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TessdataType tessdata_dawg_type,
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int dawg_debug_level)
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: lang_(lang),
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data_file_name_(data_file_name),
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tessdata_dawg_type_(tessdata_dawg_type),
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dawg_debug_level_(dawg_debug_level) {}
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Dawg *Load();
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STRING lang_;
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const char *data_file_name_;
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TessdataType tessdata_dawg_type_;
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int dawg_debug_level_;
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};
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Dawg *DawgCache::GetSquishedDawg(
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const STRING &lang,
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const char *data_file_name,
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TessdataType tessdata_dawg_type,
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int debug_level) {
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STRING data_id = data_file_name;
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data_id += kTessdataFileSuffixes[tessdata_dawg_type];
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DawgLoader loader(lang, data_file_name, tessdata_dawg_type, debug_level);
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return dawgs_.Get(data_id, NewTessCallback(&loader, &DawgLoader::Load));
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}
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Dawg *DawgLoader::Load() {
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TessdataManager data_loader;
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if (!data_loader.Init(data_file_name_, dawg_debug_level_)) {
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return NULL;
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}
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if (!data_loader.SeekToStart(tessdata_dawg_type_)) {
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data_loader.End();
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return NULL;
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}
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FILE *fp = data_loader.GetDataFilePtr();
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DawgType dawg_type;
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PermuterType perm_type;
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switch (tessdata_dawg_type_) {
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case TESSDATA_PUNC_DAWG:
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case TESSDATA_LSTM_PUNC_DAWG:
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dawg_type = DAWG_TYPE_PUNCTUATION;
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perm_type = PUNC_PERM;
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break;
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case TESSDATA_SYSTEM_DAWG:
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case TESSDATA_LSTM_SYSTEM_DAWG:
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dawg_type = DAWG_TYPE_WORD;
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perm_type = SYSTEM_DAWG_PERM;
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break;
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case TESSDATA_NUMBER_DAWG:
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case TESSDATA_LSTM_NUMBER_DAWG:
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dawg_type = DAWG_TYPE_NUMBER;
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perm_type = NUMBER_PERM;
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break;
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case TESSDATA_BIGRAM_DAWG:
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dawg_type = DAWG_TYPE_WORD; // doesn't actually matter
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perm_type = COMPOUND_PERM; // doesn't actually matter
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break;
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case TESSDATA_UNAMBIG_DAWG:
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dawg_type = DAWG_TYPE_WORD;
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perm_type = SYSTEM_DAWG_PERM;
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break;
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case TESSDATA_FREQ_DAWG:
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dawg_type = DAWG_TYPE_WORD;
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perm_type = FREQ_DAWG_PERM;
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break;
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default:
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data_loader.End();
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return NULL;
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}
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SquishedDawg *retval =
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new SquishedDawg(fp, dawg_type, lang_, perm_type, dawg_debug_level_);
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data_loader.End();
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return retval;
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}
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} // namespace tesseract
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