ccutil.cpp

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// Copyright 2008 Google Inc. All Rights Reserved.
// Author: scharron@google.com (Samuel Charron)
// 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.
 
#if defined(_WIN32)
#  include <io.h> // for _access
#endif
 
#include "ccutil.h"
 
#include <cstdlib>
#include <cstring> // for std::strrchr
 
namespace tesseract {
 
CCUtil::CCUtil()
    : params_()
      , INT_INIT_MEMBER(ambigs_debug_level, 0, "Debug level for unichar ambiguities", &params_)
      , BOOL_MEMBER(use_ambigs_for_adaption, false,
                  "Use ambigs for deciding"
                  " whether to adapt to a character",
                  &params_) {}
 
// Destructor.
// It is defined here, so the compiler can create a single vtable
// instead of weak vtables in every compilation unit.
CCUtil::~CCUtil() = default;
 
void CCUtil::main_setup(const std::string &argv0, const std::string &basename) {
  imagebasename = basename; 
  char *tessdata_prefix = getenv("TESSDATA_PREFIX");
 
  if (!argv0.empty()) {
    /* 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.empty() || _access(datadir.c_str(), 0) != 0) {
    /* Look for tessdata in directory of executable. */
    char path[_MAX_PATH];
    DWORD length = GetModuleFileName(nullptr, path, sizeof(path));
    if (length > 0 && length < sizeof(path)) {
      char *separator = std::strrchr(path, '\\');
      if (separator != nullptr) {
        *separator = '\0';
        std::string subdir = path;
        subdir += "/tessdata";
        if (_access(subdir.c_str(), 0) == 0) {
          datadir = subdir;
        }
      }
    }
#endif /* _WIN32 */
  }
 
  // datadir may still be empty:
  if (datadir.empty()) {
#if defined(TESSDATA_PREFIX)
    // Use tessdata prefix which was compiled in.
    datadir = TESSDATA_PREFIX "/tessdata";
#else
    datadir = "./";
#endif /* TESSDATA_PREFIX */
  }
 
  // check for missing directory separator
  const char *lastchar = datadir.c_str();
  lastchar += datadir.length() - 1;
  if ((strcmp(lastchar, "/") != 0) && (strcmp(lastchar, "\\") != 0)) {
    datadir += "/";
  }
}
 
} // namespace tesseract