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Diffstat (limited to 'third_party/protobuf/3.6.0/src/google/protobuf/stubs/io_win32.cc')
| -rw-r--r-- | third_party/protobuf/3.6.0/src/google/protobuf/stubs/io_win32.cc | 414 |
1 files changed, 414 insertions, 0 deletions
diff --git a/third_party/protobuf/3.6.0/src/google/protobuf/stubs/io_win32.cc b/third_party/protobuf/3.6.0/src/google/protobuf/stubs/io_win32.cc new file mode 100644 index 0000000000..4407facb40 --- /dev/null +++ b/third_party/protobuf/3.6.0/src/google/protobuf/stubs/io_win32.cc @@ -0,0 +1,414 @@ +// 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/etc. on Windows, as well +// as for the supporting utility functions. +// +// These functions convert the input path to an absolute Windows path +// with "\\?\" prefix, then pass that to _wopen/_wmkdir/_waccess/etc. +// (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) + +// Comment this out to fall back to using the ANSI versions (open, mkdir, ...) +// instead of the Unicode ones (_wopen, _wmkdir, ...). Doing so can be useful to +// debug failing tests if that's caused by the long path support. +#define SUPPORT_LONGPATHS + +#include <ctype.h> +#include <direct.h> +#include <errno.h> +#include <fcntl.h> +#include <io.h> +#include <memory> +#include <sys/stat.h> +#include <sys/types.h> +#include <wctype.h> +#include <windows.h> + +#include <google/protobuf/stubs/io_win32.h> + +#include <memory> +#include <sstream> +#include <string> +#include <vector> + +namespace google { +namespace protobuf { +namespace internal { +namespace win32 { +namespace { + +using std::string; +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 null_or_empty(const char_type* s) { + return s == NULL || *s == 0; +} + +// Returns true if the path starts with a drive letter, e.g. "c:". +// Note that this won't check for the "\" after the drive letter, so this also +// returns true for "c:foo" (which is "c:\${PWD}\foo"). +// This check requires that a path not have a longpath prefix ("\\?\"). +template <typename char_type> +bool has_drive_letter(const char_type* ch) { + return CharTraits<char_type>::is_alpha(ch[0]) && ch[1] == ':'; +} + +// Returns true if the path starts with a longpath prefix ("\\?\"). +template <typename char_type> +bool has_longpath_prefix(const char_type* path) { + return path[0] == '\\' && path[1] == '\\' && path[2] == '?' && + path[3] == '\\'; +} + +template <typename char_type> +bool is_separator(char_type c) { + return c == '/' || c == '\\'; +} + +// Returns true if the path starts with a drive specifier (e.g. "c:\"). +template <typename char_type> +bool is_path_absolute(const char_type* path) { + return has_drive_letter(path) && is_separator(path[2]); +} + +template <typename char_type> +bool is_drive_relative(const char_type* path) { + return has_drive_letter(path) && (path[2] == 0 || !is_separator(path[2])); +} + +wstring join_paths(const wstring& path1, const wstring& path2) { + if (path1.empty() || is_path_absolute(path2.c_str()) || + has_longpath_prefix(path2.c_str())) { + return path2; + } + if (path2.empty()) { + return path1; + } + + if (is_separator(path1[path1.size() - 1])) { + return is_separator(path2[0]) ? (path1 + path2.substr(1)) + : (path1 + path2); + } else { + return is_separator(path2[0]) ? (path1 + path2) + : (path1 + L'\\' + path2); + } +} + +wstring normalize(wstring path) { + if (has_longpath_prefix(path.c_str())) { + path = path.substr(4); + } + + static const wstring dot(L"."); + static const wstring dotdot(L".."); + const WCHAR* p = path.c_str(); + + std::vector<wstring> segments; + int segment_start = -1; + // Find the path segments in `path` (separated by "/"). + for (int i = 0;; ++i) { + if (!is_separator(p[i]) && p[i] != L'\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 "..". + wstring segment(p, segment_start, i - segment_start); + segment_start = -1; + if (segment == dotdot) { + if (!segments.empty() && + (!has_drive_letter(segments[0].c_str()) || segments.size() > 1)) { + segments.pop_back(); + } + } else if (segment != dot && !segment.empty()) { + segments.push_back(segment); + } + } + if (p[i] == L'\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] + L'\\'; + } + + // Join all segments. + bool first = true; + std::wstringstream result; + for (int i = 0; i < segments.size(); ++i) { + if (!first) { + result << L'\\'; + } + first = false; + result << segments[i]; + } + // Preserve trailing separator if the input contained it. + if (!path.empty() && is_separator(p[path.size() - 1])) { + result << L'\\'; + } + return result.str(); +} + +bool as_windows_path(const char* path, wstring* result) { + if (null_or_empty(path)) { + result->clear(); + return true; + } + wstring wpath; + if (!strings::utf8_to_wcs(path, &wpath)) { + return false; + } + if (has_longpath_prefix(wpath.c_str())) { + *result = wpath; + return true; + } + if (is_separator(path[0]) || is_drive_relative(path)) { + return false; + } + + + if (!is_path_absolute(wpath.c_str())) { + int size = ::GetCurrentDirectoryW(0, NULL); + if (size == 0 && GetLastError() != ERROR_INSUFFICIENT_BUFFER) { + return false; + } + std::unique_ptr<WCHAR[]> wcwd(new WCHAR[size]); + ::GetCurrentDirectoryW(size, wcwd.get()); + wpath = join_paths(wcwd.get(), wpath); + } + wpath = normalize(wpath); + if (!has_longpath_prefix(wpath.c_str())) { + // Add the "\\?\" prefix unconditionally. This way we prevent the Win32 API + // from processing the path and "helpfully" removing trailing dots from the + // path, for example. + // See https://github.com/bazelbuild/bazel/issues/2935 + wpath = wstring(L"\\\\?\\") + wpath; + } + *result = wpath; + return true; +} + +} // namespace + +int open(const char* path, int flags, int mode) { +#ifdef SUPPORT_LONGPATHS + wstring wpath; + if (!as_windows_path(path, &wpath)) { + errno = ENOENT; + return -1; + } + return ::_wopen(wpath.c_str(), flags, mode); +#else + return ::_open(path, flags, mode); +#endif +} + +int mkdir(const char* path, int _mode) { +#ifdef SUPPORT_LONGPATHS + wstring wpath; + if (!as_windows_path(path, &wpath)) { + errno = ENOENT; + return -1; + } + return ::_wmkdir(wpath.c_str()); +#else // not SUPPORT_LONGPATHS + return ::_mkdir(path); +#endif // not SUPPORT_LONGPATHS +} + +int access(const char* path, int mode) { +#ifdef SUPPORT_LONGPATHS + wstring wpath; + if (!as_windows_path(path, &wpath)) { + errno = ENOENT; + return -1; + } + return ::_waccess(wpath.c_str(), mode); +#else + return ::_access(path, mode); +#endif +} + +int chdir(const char* path) { +#ifdef SUPPORT_LONGPATHS + wstring wpath; + if (!as_windows_path(path, &wpath)) { + errno = ENOENT; + return -1; + } + return ::_wchdir(wpath.c_str()); +#else + return ::_chdir(path); +#endif +} + +int stat(const char* path, struct _stat* buffer) { +#ifdef SUPPORT_LONGPATHS + wstring wpath; + if (!as_windows_path(path, &wpath)) { + errno = ENOENT; + return -1; + } + return ::_wstat(wpath.c_str(), buffer); +#else // not SUPPORT_LONGPATHS + return ::_stat(path, buffer); +#endif // not SUPPORT_LONGPATHS +} + +FILE* fopen(const char* path, const char* mode) { +#ifdef SUPPORT_LONGPATHS + if (null_or_empty(path)) { + errno = EINVAL; + return NULL; + } + wstring wpath; + if (!as_windows_path(path, &wpath)) { + errno = ENOENT; + return NULL; + } + wstring wmode; + if (!strings::utf8_to_wcs(mode, &wmode)) { + errno = EINVAL; + return NULL; + } + return ::_wfopen(wpath.c_str(), wmode.c_str()); +#else + return ::fopen(path, mode); +#endif +} + +int close(int fd) { return ::close(fd); } + +int dup(int fd) { return ::_dup(fd); } + +int dup2(int fd1, int fd2) { return ::_dup2(fd1, fd2); } + +int read(int fd, void* buffer, size_t size) { + return ::_read(fd, buffer, size); +} + +int setmode(int fd, int mode) { return ::_setmode(fd, mode); } + +int write(int fd, const void* buffer, size_t size) { + return ::_write(fd, buffer, size); +} + +wstring testonly_utf8_to_winpath(const char* path) { + wstring wpath; + return as_windows_path(path, &wpath) ? wpath : wstring(); +} + +namespace strings { + +bool wcs_to_mbs(const WCHAR* s, string* out, bool outUtf8) { + if (null_or_empty(s)) { + out->clear(); + return true; + } + BOOL usedDefaultChar = FALSE; + SetLastError(0); + int size = WideCharToMultiByte( + outUtf8 ? CP_UTF8 : CP_ACP, 0, s, -1, NULL, 0, NULL, + outUtf8 ? NULL : &usedDefaultChar); + if ((size == 0 && GetLastError() != ERROR_INSUFFICIENT_BUFFER) + || usedDefaultChar) { + return false; + } + std::unique_ptr<CHAR[]> astr(new CHAR[size]); + WideCharToMultiByte( + outUtf8 ? CP_UTF8 : CP_ACP, 0, s, -1, astr.get(), size, NULL, NULL); + out->assign(astr.get()); + return true; +} + +bool mbs_to_wcs(const char* s, wstring* out, bool inUtf8) { + if (null_or_empty(s)) { + out->clear(); + return true; + } + + SetLastError(0); + int size = + MultiByteToWideChar(inUtf8 ? CP_UTF8 : CP_ACP, 0, s, -1, NULL, 0); + if (size == 0 && GetLastError() != ERROR_INSUFFICIENT_BUFFER) { + return false; + } + std::unique_ptr<WCHAR[]> wstr(new WCHAR[size]); + MultiByteToWideChar( + inUtf8 ? CP_UTF8 : CP_ACP, 0, s, -1, wstr.get(), size + 1); + out->assign(wstr.get()); + return true; +} + +bool utf8_to_wcs(const char* input, wstring* out) { + return mbs_to_wcs(input, out, true); +} + +bool wcs_to_utf8(const wchar_t* input, string* out) { + return wcs_to_mbs(input, out, true); +} + +} // namespace strings +} // namespace win32 +} // namespace internal +} // namespace protobuf +} // namespace google + +#endif // defined(_WIN32) |