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61 lines
2.6 KiB
C
61 lines
2.6 KiB
C
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/**********************************************************************
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* File: boxread.cpp
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* Description: Read data from a box file.
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* Author: Ray Smith
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* Created: Fri Aug 24 17:47:23 PDT 2007
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*
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* (C) Copyright 2007, 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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#ifndef TESSERACT_CCUTIL_BOXREAD_H__
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#define TESSERACT_CCUTIL_BOXREAD_H__
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#include <stdio.h>
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#include "strngs.h"
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class STRING;
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class TBOX;
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// Size of buffer used to read a line from a box file.
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const int kBoxReadBufSize = 1024;
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// Open the boxfile based on the given image filename.
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FILE* OpenBoxFile(const STRING& fname);
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// ReadNextBox factors out the code to interpret a line of a box
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// file so that applybox and unicharset_extractor interpret the same way.
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// This function returns the next valid box file utf8 string and coords
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// and returns true, or false on eof (and closes the file).
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// It ignores the utf8 file signature ByteOrderMark (U+FEFF=EF BB BF), checks
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// for valid utf-8 and allows space or tab between fields.
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// utf8_str is set with the unichar string, and bounding box with the box.
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// If there are page numbers in the file, it reads them all.
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bool ReadNextBox(int *line_number, FILE* box_file,
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STRING* utf8_str, TBOX* bounding_box);
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// As ReadNextBox above, but get a specific page number. (0-based)
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// Use -1 to read any page number. Files without page number all
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// read as if they are page 0.
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bool ReadNextBox(int target_page, int *line_number, FILE* box_file,
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STRING* utf8_str, TBOX* bounding_box);
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// Parses the given box file string into a page_number, utf8_str, and
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// bounding_box. Returns true on a successful parse.
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bool ParseBoxFileStr(const char* boxfile_str, int* page_number,
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STRING* utf8_str, TBOX* bounding_box);
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// Creates a box file string from a unichar string, TBOX and page number.
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void MakeBoxFileStr(const char* unichar_str, const TBOX& box, int page_num,
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STRING* box_str);
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#endif // TESSERACT_CCUTIL_BOXREAD_H__
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