1 files changed, 281 insertions, 0 deletions
diff --git a/third_party/protobuf/src/google/protobuf/stubs/io_win32.cc b/third_party/protobuf/src/google/protobuf/stubs/io_win32.cc
new file mode 100644
index 0000000000..b5f1cdf0b7
--- /dev/null
+++ b/third_party/protobuf/src/google/protobuf/stubs/io_win32.cc
@@ -0,0 +1,281 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: laszlocsomor@google.com (Laszlo Csomor)
+//
+// Implementation for long-path-aware open/mkdir/access on Windows.
+//
+// These functions convert the input path to an absolute Windows path
+// with UNC prefix if necessary, then pass that to
+// _wopen/_wmkdir/_waccess (declared in <io.h>) respectively. This
+// allows working with files/directories whose paths are longer than
+// MAX_PATH (260 chars).
+//
+// This file is only used on Windows, it's empty on other platforms.
+
+#if defined(_WIN32)
+
+#include <ctype.h>
+#include <errno.h>
+#include <wctype.h>
+
+#include <google/protobuf/stubs/io_win32.h>
+
+#include <cassert>
+#include <memory>
+#include <sstream>
+#include <string>
+#include <vector>
+
+namespace google {
+namespace protobuf {
+namespace stubs {
+namespace {
+
+using std::string;
+using std::unique_ptr;
+using std::wstring;
+
+template <typename char_type>
+struct CharTraits {
+  static bool is_alpha(char_type ch);
+};
+
+template <>
+struct CharTraits<char> {
+  static bool is_alpha(char ch) { return isalpha(ch); }
+};
+
+template <>
+struct CharTraits<wchar_t> {
+  static bool is_alpha(wchar_t ch) { return iswalpha(ch); }
+};
+
+template <typename char_type>
+bool has_drive_letter(const char_type* ch) {
+  return CharTraits<char_type>::is_alpha(ch[0]) && ch[1] == ':';
+}
+
+template <typename char_type>
+bool has_unc_prefix(const std::basic_string<char_type>& path) {
+  return path.size() > 4 && path[0] == '\\' && path[1] == '\\' &&
+         path[2] == '?' && path[3] == '\\';
+}
+
+template <typename char_type>
+bool is_path_absolute(const std::basic_string<char_type>& path) {
+  return (path.size() > 2 && path[1] == ':') || has_unc_prefix(path);
+}
+
+template <typename char_type>
+bool is_separator(char_type c) {
+  return c == '/' || c == '\\';
+}
+
+bool is_drive_relative(const string& s) {
+  return s.size() >= 2 && isalpha(s[0]) && s[1] == ':' &&
+         (s.size() == 2 || !is_separator(s[2]));
+}
+
+void replace_directory_separators(WCHAR* p) {
+  for (; *p != L'\0'; ++p) {
+    if (*p == L'/') {
+      *p = L'\\';
+    }
+  }
+}
+
+wstring get_cwd() {
+  DWORD result = ::GetCurrentDirectoryW(0, NULL);
+  std::unique_ptr<WCHAR[]> cwd(new WCHAR[result]);
+  ::GetCurrentDirectoryW(result, cwd.get());
+  cwd.get()[result - 1] = 0;
+  replace_directory_separators(cwd.get());
+  return std::move(wstring(cwd.get()));
+}
+
+wstring join_paths(const wstring& path1, const wstring& path2) {
+  if (path1.empty() || is_path_absolute(path2)) {
+    return path2;
+  }
+  if (path2.empty()) {
+    return path1;
+  }
+
+  if (is_separator(path1.back())) {
+    return is_separator(path2.front()) ? (path1 + path2.substr(1))
+                                       : (path1 + path2);
+  } else {
+    return is_separator(path2.front()) ? (path1 + path2)
+                                       : (path1 + L'\\' + path2);
+  }
+}
+
+string normalize(string path) {
+  if (has_unc_prefix(path)) {
+    path = path.substr(4);
+  }
+
+  static const string dot(".");
+  static const string dotdot("..");
+
+  std::vector<string> segments;
+  int segment_start = -1;
+  // Find the path segments in `path` (separated by "/").
+  for (int i = 0;; ++i) {
+    if (!is_separator(path[i]) && path[i] != '\0') {
+      // The current character does not end a segment, so start one unless it's
+      // already started.
+      if (segment_start < 0) {
+        segment_start = i;
+      }
+    } else if (segment_start >= 0 && i > segment_start) {
+      // The current character is "/" or "\0", so this ends a segment.
+      // Add that to `segments` if there's anything to add; handle "." and "..".
+      string segment(path, segment_start, i - segment_start);
+      segment_start = -1;
+      if (segment == dotdot) {
+        if (!segments.empty() && !has_drive_letter(segments[0].c_str())) {
+          segments.pop_back();
+        }
+      } else if (segment != dot) {
+        segments.push_back(segment);
+      }
+    }
+    if (path[i] == '\0') {
+      break;
+    }
+  }
+
+  // Handle the case when `path` is just a drive specifier (or some degenerate
+  // form of it, e.g. "c:\..").
+  if (segments.size() == 1 && segments[0].size() == 2 &&
+      has_drive_letter(segments[0].c_str())) {
+    return segments[0] + '\\';
+  }
+
+  // Join all segments.
+  bool first = true;
+  std::ostringstream result;
+  for (const auto& s : segments) {
+    if (!first) {
+      result << '\\';
+    }
+    first = false;
+    result << s;
+  }
+  return result.str();
+}
+
+wstring as_wchar_path(const string& path) {
+  int len =
+      ::MultiByteToWideChar(CP_UTF8, 0, path.c_str(), path.size(), NULL, 0);
+  std::unique_ptr<WCHAR[]> wbuf(new WCHAR[len + 1]);
+  ::MultiByteToWideChar(CP_UTF8, 0, path.c_str(), path.size(), wbuf.get(),
+                        len + 1);
+  wbuf.get()[len] = 0;
+  replace_directory_separators(wbuf.get());
+  return std::move(wstring(wbuf.get()));
+}
+
+bool as_windows_path(const string& path, size_t max_path,
+                            wstring* result) {
+  if (path.empty()) {
+    result->clear();
+    return true;
+  }
+  if (is_separator(path[0]) || is_drive_relative(path)) {
+    return false;
+  }
+
+  *result = as_wchar_path(normalize(path));
+  if (!is_path_absolute(path)) {
+    *result = join_paths(get_cwd(), *result);
+  }
+  if (result->size() >= max_path && !has_unc_prefix(*result)) {
+    *result = wstring(L"\\\\?\\") + *result;
+  }
+  return true;
+}
+
+}  // namespace
+
+int win32_open(const char* path, int flags, int mode) {
+  wstring wpath;
+  if (!as_windows_path(path, MAX_PATH, &wpath)) {
+    errno = ENOENT;
+    return -1;
+  }
+  return ::_wopen(wpath.c_str(), flags, mode);
+}
+
+int win32_mkdir(const char* path, int _mode) {
+  // CreateDirectoryA's limit is 248 chars, see MSDN.
+  // https://msdn.microsoft.com/en-us/library/windows/desktop/aa363855(v=vs.85).aspx
+  // This limit presumably includes the null-terminator, because other
+  // functions that have the MAX_PATH limit, such as CreateFileA,
+  // actually include it.
+  wstring wpath;
+  if (!as_windows_path(path, 248, &wpath)) {
+    errno = ENOENT;
+    return -1;
+  }
+  return ::_wmkdir(wpath.c_str());
+}
+
+int win32_access(const char* path, int mode) {
+  // _access/_waccess in <io.h> don't support checking for executability (nor is
+  // X_OK defined).
+  // They support checking for readability (but R_OK is not defined) but we
+  // never use them for that in the protobuf source code.
+  // Existence and writability check are also supported, but again F_OK and W_OK
+  // aren't defined as constants in <io.h>; they are defined in io_win32.h
+  // Therefore we only support F_OK and W_OK.
+  assert(mode & ~(F_OK | W_OK) == 0);
+  wstring wpath;
+  if (!as_windows_path(path, MAX_PATH, &wpath)) {
+    errno = ENOENT;
+    return -1;
+  }
+  return ::_waccess(wpath.c_str(), mode);
+}
+
+wstring testonly_path_to_winpath(const string& path, size_t max_path) {
+  wstring wpath;
+  as_windows_path(path, max_path, &wpath);
+  return wpath;
+}
+
+}  // namespace stubs
+}  // namespace protobuf
+}  // namespace google
+
+#endif  // defined(_WIN32)
+