Replace access/_access by std::filesystem::exists (#4307)

Signed-off-by: Stefan Weil <sw@weilnetz.de>

src/ccutil/ccutil.cpp

@@ -10,10 +10,6 @@
 // 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 "tprintf.h"  // for tprintf
 
@@ -63,7 +59,7 @@ void CCUtil::main_setup(const std::string &argv0, const std::string &basename) {
     /* Use tessdata prefix from the environment. */
     datadir = tessdata_prefix;
 #if defined(_WIN32)
-  } else if (datadir.empty() || _access(datadir.c_str(), 0) != 0) {
+  } else if (datadir.empty() || !std::filesystem::exists(datadir)) {
     /* Look for tessdata in directory of executable. */
     char path[_MAX_PATH];
     DWORD length = GetModuleFileName(nullptr, path, sizeof(path));
@@ -73,7 +69,7 @@ void CCUtil::main_setup(const std::string &argv0, const std::string &basename) {
         *separator = '\0';
         std::string subdir = path;
         subdir += "/tessdata";
-        if (_access(subdir.c_str(), 0) == 0) {
+        if (std::filesystem::exists(subdir)) {
           datadir = subdir;
         }
       }

unittest/pagesegmode_test.cc

@@ -9,13 +9,9 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#if defined(_WIN32)
-#  include <io.h> // for _access
-#else
-#  include <unistd.h> // for access
-#endif
 #include <allheaders.h>
 #include <tesseract/baseapi.h>
+#include <filesystem>
 #include <string>
 #include "helpers.h"
 #include "include_gunit.h"
@@ -24,15 +20,6 @@
 
 namespace tesseract {
 
-// Replacement for std::filesystem::exists (C++-17)
-static bool file_exists(const char *filename) {
-#if defined(_WIN32)
-  return _access(filename, 0) == 0;
-#else
-  return access(filename, 0) == 0;
-#endif
-}
-
 // The fixture for testing Tesseract.
 class PageSegModeTest : public testing::Test {
 protected:
@@ -86,7 +73,7 @@ protected:
 // and differently to line and block mode.
 TEST_F(PageSegModeTest, WordTest) {
   std::string filename = file::JoinPath(TESTING_DIR, "segmodeimg.tif");
-  if (!file_exists(filename.c_str())) {
+  if (!std::filesystem::exists(filename)) {
     LOG(INFO) << "Skip test because of missing " << filename << '\n';
     GTEST_SKIP();
   } else {

unittest/tatweel_test.cc

@@ -9,12 +9,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#if defined(_WIN32)
+#include <filesystem>
-#  include <io.h> // for _access
-#else
-#  include <unistd.h> // for access
-#endif
-
 #include "dawg.h"
 #include "include_gunit.h"
 #include "trie.h"
@@ -23,15 +18,6 @@
 
 namespace tesseract {
 
-// Replacement for std::filesystem::exists (C++-17)
-static bool file_exists(const char *filename) {
-#if defined(_WIN32)
-  return _access(filename, 0) == 0;
-#else
-  return access(filename, 0) == 0;
-#endif
-}
-
 class TatweelTest : public ::testing::Test {
 protected:
   void SetUp() override {
@@ -41,7 +27,7 @@ protected:
 
   TatweelTest() {
     std::string filename = TestDataNameToPath("ara.wordlist");
-    if (file_exists(filename.c_str())) {
+    if (std::filesystem::exists(filename)) {
       std::string wordlist("\u0640");
       CHECK_OK(file::GetContents(filename, &wordlist, file::Defaults()));
       // Put all the unicodes in the unicharset_.
@@ -77,7 +63,7 @@ TEST_F(TatweelTest, DictIgnoresTatweel) {
   // This test verifies that the dictionary ignores the Tatweel character.
   tesseract::Trie trie(tesseract::DAWG_TYPE_WORD, "ara", SYSTEM_DAWG_PERM, unicharset_.size(), 0);
   std::string filename = TestDataNameToPath("ara.wordlist");
-  if (!file_exists(filename.c_str())) {
+  if (!std::filesystem::exists(filename)) {
     LOG(INFO) << "Skip test because of missing " << filename;
     GTEST_SKIP();
   } else {
@@ -91,7 +77,7 @@ TEST_F(TatweelTest, UnicharsetLoadKeepsTatweel) {
   // This test verifies that a load of an existing unicharset keeps any
   // existing tatweel for backwards compatibility.
   std::string filename = TestDataNameToPath("ara.unicharset");
-  if (!file_exists(filename.c_str())) {
+  if (!std::filesystem::exists(filename)) {
     LOG(INFO) << "Skip test because of missing " << filename;
     GTEST_SKIP();
   } else {