tesseract/ccutil/mainblk.cpp

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/**********************************************************************
2017-07-03 05:35:47 +08:00
* File: mainblk.cpp (Formerly main.c)
* Description: Function to call from main() to setup.
* Author: Ray Smith
* Created: Tue Oct 22 11:09:40 BST 1991
*
* (C) Copyright 1991, Hewlett-Packard Ltd.
** 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 "fileerr.h"
#ifdef __UNIX__
#include <unistd.h>
#include <signal.h>
#else
#include <io.h>
#endif
#include <stdlib.h>
#include "ccutil.h"
#define VARDIR "configs/" /**< variables files */
#define EXTERN
const ERRCODE NO_PATH =
"Warning:explicit path for executable will not be used for configs";
static const ERRCODE USAGE = "Usage";
namespace tesseract {
/**********************************************************************
* main_setup
*
* Main for mithras demo program. Read the arguments and set up globals.
**********************************************************************/
/**
* @brief CCUtil::main_setup - set location of tessdata and name of image
*
* @param argv0 - paths to the directory with language files and config files.
* An actual value of argv0 is used if not NULL, otherwise TESSDATA_PREFIX is
* used if not NULL, next try to use compiled in -DTESSDATA_PREFIX. If previous
* is not successful - use current directory.
* @param basename - name of image
*/
void CCUtil::main_setup(const char *argv0, const char *basename) {
imagebasename = basename; /**< name of image */
char *tessdata_prefix = getenv("TESSDATA_PREFIX");
if (argv0 != NULL && *argv0 != '\0') {
/* Use tessdata prefix from the command line. */
datadir = argv0;
} else if (tessdata_prefix) {
/* Use tessdata prefix from the environment. */
datadir = tessdata_prefix;
#if defined(_WIN32)
} else if (datadir == NULL || access(datadir.string(), 0) != 0) {
/* Look for tessdata in directory of executable. */
static char dir[128];
static char exe[128];
DWORD length = GetModuleFileName(NULL, exe, sizeof(exe));
if (length > 0 && length < sizeof(exe)) {
_splitpath(exe, NULL, dir, NULL, NULL);
datadir = dir;
}
#endif /* _WIN32 */
#if defined(TESSDATA_PREFIX)
} else {
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/* Use tessdata prefix which was compiled in. */
#define _STR(a) #a
#define _XSTR(a) _STR(a)
datadir = _XSTR(TESSDATA_PREFIX);
#undef _XSTR
#undef _STR
#endif
}
// datadir may still be empty:
if (datadir.length() == 0) {
datadir = "./";
} else {
// Remove tessdata from the end if present, as we will add it back!
int length = datadir.length();
if (length >= 8 && strcmp(&datadir[length - 8], "tessdata") == 0)
datadir.truncate_at(length - 8);
else if (length >= 9 && strcmp(&datadir[length - 9], "tessdata/") == 0)
datadir.truncate_at(length - 9);
}
// check for missing directory separator
const char *lastchar = datadir.string();
lastchar += datadir.length() - 1;
if ((strcmp(lastchar, "/") != 0) && (strcmp(lastchar, "\\") != 0))
datadir += "/";
datadir += m_data_sub_dir; /**< data directory */
}
} // namespace tesseract