Retrieve test data directory at run time

testing/utils/path_service.cpp

+// Copyright 2015 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "testing/utils/path_service.h"
+
+#ifdef _WIN32
+#include <Windows.h>
+#elif defined(__APPLE__)
+#include <mach-o/dyld.h>
+#else  // Linux
+#include <linux/limits.h>
+#include <unistd.h>
+#endif  // _WIN32
+
+#include "core/include/fxcrt/fx_system.h"
+
+// static
+bool PathService::EndsWithSeparator(const std::string& path) {
+  if (path.size() > 1 && path[path.size() - 1] == PATH_SEPARATOR)

[Lei Zhang, 2015/11/07 01:48:51]

if (foo)
  return true;
return false;

--> return foo;

[Wei Li, 2015/11/07 02:36:12]

Done.

+    return true;
+  return false;
+}
+
+// static
+bool PathService::GetExecutableDir(std::string* path) {
+// Get the current executable file path.
+#ifdef _WIN32
+  char path_buffer[MAX_PATH];
+  path_buffer[0] = 0;
+
+  if (GetModuleFileNameA(NULL, path_buffer, MAX_PATH) == 0)
+    return false;
+  *path = std::string(path_buffer);
+#elif defined(__APPLE__)
+  FXSYS_assert(path);
+  unsigned int path_length = 0;
+  _NSGetExecutablePath(NULL, &path_length);
+  if (path_length == 0)
+    return false;
+
+  path->reserve(path_length);
+  path->resize(path_length - 1);
+  if (_NSGetExecutablePath(&((*path)[0]), &path_length))
+    return false;
+#else   // Linux
+  static const char kProcSelfExe[] = "/proc/self/exe";
+  char buf[PATH_MAX];
+  ssize_t count = ::readlink(kProcSelfExe, buf, PATH_MAX);
+  if (count <= 0)
+    return false;
+
+  *path = std::string(buf, count);
+#endif  // _WIN32
+
+  // Get the directory path.
+  std::size_t pos = path->size() - 1;
+  if (EndsWithSeparator(*path))
+    pos--;
+  std::size_t found = path->find_last_of(PATH_SEPARATOR, pos);
+  if (found == std::string::npos)
+    return false;
+  path->resize(found);
+  return true;
+}
+
+// static
+bool PathService::GetSourceDir(std::string* path) {
+  if (!GetExecutableDir(path))
+    return false;
+
+  if (!EndsWithSeparator(*path))
+    path->push_back(PATH_SEPARATOR);
+  // Assume executables always run from out/<Debug|Release>/, the source

[Lei Zhang, 2015/11/07 01:48:51]

BTW, did some of the code in this file come from Chromium's PathService? Do they
make the same assumption there?

[Wei Li, 2015/11/07 02:36:12]

Chromium's path service is much more complex. We may not need/be able to handle
all those cases. But, yes, the assumption is same. Otherwise, how could we find
test data dir if there is no relation. 

[Lei Zhang, 2015/11/07 02:43:30]

There could be other assumptions, like looking for the .gn or AUTHORS file.

+  // directory is two levels above the executable directory.
+  path->append("..");
+  path->push_back(PATH_SEPARATOR);
+  path->append("..");
+  return true;
+}
+
+// static
+bool PathService::GetTestDataDir(std::string* path) {
+  if (!GetSourceDir(path))
+    return false;
+
+  if (!EndsWithSeparator(*path))
+    path->push_back(PATH_SEPARATOR);
+  path->append("testing");
+  path->push_back(PATH_SEPARATOR);
+  path->append("resources");
+  return true;
+}
+
+// static
+bool PathService::GetTestFilePath(const std::string& file_name,
+                                  std::string* path) {
+  if (!GetTestDataDir(path))
+    return false;
+
+  if (!EndsWithSeparator(*path))
+    path->push_back(PATH_SEPARATOR);
+  path->append(file_name);
+  return true;
+}