mirror of
https://github.com/tesseract-ocr/tesseract.git
synced 2024-11-24 19:19:05 +08:00
81 lines
2.7 KiB
C++
81 lines
2.7 KiB
C++
|
/**********************************************************************
|
||
|
|
* File: boxread.cpp
|
||
|
|
* Description: Read data from a box file.
|
||
|
|
* Author: Ray Smith
|
||
|
|
* Created: Fri Aug 24 17:47:23 PDT 2007
|
||
|
|
*
|
||
|
|
* (C) Copyright 2007, 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 "mfcpch.h"
|
||
|
|
#include <string.h>
|
||
|
|
#include "boxread.h"
|
||
|
|
#include "unichar.h"
|
||
|
|
#include "tprintf.h"
|
||
|
|
|
||
|
|
bool read_next_box(FILE* box_file, char* utf8_str,
|
||
|
|
int* x_min, int* y_min, int* x_max, int* y_max) {
|
||
|
|
static int line = 0;
|
||
|
|
int count = 0;
|
||
|
|
char buff[kBufSize]; //boxfile read buffer
|
||
|
|
char uch[kBufSize];
|
||
|
|
char *buffptr = buff;
|
||
|
|
|
||
|
|
while (!feof(box_file)) {
|
||
|
|
fgets(buff, sizeof(buff) - 1, box_file);
|
||
|
|
line++;
|
||
|
|
|
||
|
|
buffptr = buff;
|
||
|
|
const unsigned char *ubuf = reinterpret_cast<const unsigned char*>(buffptr);
|
||
|
|
if (ubuf[0] == 0xef && ubuf[1] == 0xbb && ubuf[2] == 0xbf)
|
||
|
|
buffptr += 3; // Skip unicode file designation.
|
||
|
|
/* Check for blank lines in box file */
|
||
|
|
while (*buffptr == ' ' || *buffptr == '\t')
|
||
|
|
buffptr++;
|
||
|
|
if (*buffptr != '\0') {
|
||
|
|
count = sscanf(buffptr, "%s " INT32FORMAT " " INT32FORMAT " "
|
||
|
|
INT32FORMAT " " INT32FORMAT,
|
||
|
|
uch, x_min, y_min, x_max, y_max);
|
||
|
|
if (count == 5) {
|
||
|
|
// Validate UTF8 by making unichars with it.
|
||
|
|
int used = 0;
|
||
|
|
int uch_len = strlen(uch);
|
||
|
|
while (used < uch_len) {
|
||
|
|
UNICHAR ch(uch + used, uch_len - used);
|
||
|
|
int new_used = ch.utf8_len();
|
||
|
|
if (new_used == 0) {
|
||
|
|
tprintf("Bad utf-8 char starting with 0x%x at line %d, col %d, \n",
|
||
|
|
uch[used], used + 1, line);
|
||
|
|
count = 0;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
used += new_used;
|
||
|
|
}
|
||
|
|
if (uch_len > UNICHAR_LEN) {
|
||
|
|
tprintf("utf-8 string too long at line %d\n", line);
|
||
|
|
count = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (count != 5) {
|
||
|
|
tprintf("Box file format error on line %i ignored\n", line);
|
||
|
|
} else {
|
||
|
|
strcpy(utf8_str, uch);
|
||
|
|
return true; //read a box ok
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
fclose(box_file);
|
||
|
|
line = 0;
|
||
|
|
return false; //EOF
|
||
|
|
}
|