Tesseract 3.01
/data/source/tesseract-ocr/ccutil/boxread.h
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00001 /**********************************************************************
00002  * File:        boxread.cpp
00003  * Description: Read data from a box file.
00004  * Author:              Ray Smith
00005  * Created:             Fri Aug 24 17:47:23 PDT 2007
00006  *
00007  * (C) Copyright 2007, Google Inc.
00008  ** Licensed under the Apache License, Version 2.0 (the "License");
00009  ** you may not use this file except in compliance with the License.
00010  ** You may obtain a copy of the License at
00011  ** http://www.apache.org/licenses/LICENSE-2.0
00012  ** Unless required by applicable law or agreed to in writing, software
00013  ** distributed under the License is distributed on an "AS IS" BASIS,
00014  ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00015  ** See the License for the specific language governing permissions and
00016  ** limitations under the License.
00017  *
00018  **********************************************************************/
00019 
00020 #ifndef TESSERACT_CCUTIL_BOXREAD_H__
00021 #define TESSERACT_CCUTIL_BOXREAD_H__
00022 
00023 #include <stdio.h>
00024 #include "strngs.h"
00025 
00026 // Size of buffer used to read a line from a box file.
00027 const int kBoxReadBufSize = 1024;
00028 
00029 // Open the boxfile based on the given image filename.
00030 FILE* OpenBoxFile(const STRING& fname);
00031 
00032 // read_next_box factors out the code to interpret a line of a box
00033 // file so that applybox and unicharset_extractor interpret the same way.
00034 // This function returns the next valid box file utf8 string and coords
00035 // and returns true, or false on eof (and closes the file).
00036 // If ignores the uft8 file signature, checks for valid utf-8 and allows
00037 // space or tab between fields.
00038 // utf8_str must be at least kBoxReadBufSize in length.
00039 // If there are page numbers in the file, it reads them all.
00040 bool read_next_box(int *line_number, FILE* box_file, char* utf8_str,
00041                    int* x_min, int* y_min, int* x_max, int* y_max);
00042 // As read_next_box above, but get a specific page number. (0-based)
00043 // Use -1 to read any page number. Files without page number all
00044 // read as if they are page 0.
00045 bool read_next_box(int page, int *line_number, FILE* box_file, char* utf8_str,
00046                    int* x_min, int* y_min, int* x_max, int* y_max);
00047 
00048 #endif  // TESSERACT_CCUTIL_BOXREAD_H__
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