| //===- llvm/Support/Win32/PathV2.cpp - Windows Path Impl --------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements the Windows specific implementation of the PathV2 API. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| //===----------------------------------------------------------------------===// |
| //=== WARNING: Implementation here must contain only generic Windows code that |
| //=== is guaranteed to work on *all* Windows variants. |
| //===----------------------------------------------------------------------===// |
| |
| #include "Windows.h" |
| #include <WinCrypt.h> |
| #include <io.h> |
| |
| using namespace llvm; |
| |
| namespace { |
| typedef BOOLEAN (WINAPI *PtrCreateSymbolicLinkW)( |
| /*__in*/ LPCWSTR lpSymlinkFileName, |
| /*__in*/ LPCWSTR lpTargetFileName, |
| /*__in*/ DWORD dwFlags); |
| |
| PtrCreateSymbolicLinkW create_symbolic_link_api = PtrCreateSymbolicLinkW( |
| ::GetProcAddress(::GetModuleHandleA("kernel32.dll"), |
| "CreateSymbolicLinkW")); |
| |
| error_code UTF8ToUTF16(const StringRef &utf8, |
| SmallVectorImpl<wchar_t> &utf16) { |
| int len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, |
| utf8.begin(), utf8.size(), |
| utf16.begin(), 0); |
| |
| if (len == 0) |
| return make_error_code(windows_error(::GetLastError())); |
| |
| utf16.reserve(len + 1); |
| utf16.set_size(len); |
| |
| len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, |
| utf8.begin(), utf8.size(), |
| utf16.begin(), utf16.size()); |
| |
| if (len == 0) |
| return make_error_code(windows_error(::GetLastError())); |
| |
| // Make utf16 null terminated. |
| utf16.push_back(0); |
| utf16.pop_back(); |
| |
| return make_error_code(errc::success); |
| } |
| |
| error_code UTF16ToUTF8(const wchar_t *utf16, size_t utf16_len, |
| SmallVectorImpl<char> &utf8) { |
| // Get length. |
| int len = ::WideCharToMultiByte(CP_UTF8, NULL, |
| utf16, utf16_len, |
| utf8.begin(), 0, |
| NULL, NULL); |
| |
| if (len == 0) |
| return make_error_code(windows_error(::GetLastError())); |
| |
| utf8.reserve(len); |
| utf8.set_size(len); |
| |
| // Now do the actual conversion. |
| len = ::WideCharToMultiByte(CP_UTF8, NULL, |
| utf16, utf16_len, |
| utf8.data(), utf8.size(), |
| NULL, NULL); |
| |
| if (len == 0) |
| return make_error_code(windows_error(::GetLastError())); |
| |
| // Make utf8 null terminated. |
| utf8.push_back(0); |
| utf8.pop_back(); |
| |
| return make_error_code(errc::success); |
| } |
| |
| error_code TempDir(SmallVectorImpl<wchar_t> &result) { |
| retry_temp_dir: |
| DWORD len = ::GetTempPathW(result.capacity(), result.begin()); |
| |
| if (len == 0) |
| return make_error_code(windows_error(::GetLastError())); |
| |
| if (len > result.capacity()) { |
| result.reserve(len); |
| goto retry_temp_dir; |
| } |
| |
| result.set_size(len); |
| return make_error_code(errc::success); |
| } |
| |
| struct AutoCryptoProvider { |
| HCRYPTPROV CryptoProvider; |
| |
| ~AutoCryptoProvider() { |
| ::CryptReleaseContext(CryptoProvider, 0); |
| } |
| |
| operator HCRYPTPROV() const {return CryptoProvider;} |
| }; |
| } |
| |
| namespace llvm { |
| namespace sys { |
| namespace path { |
| |
| error_code current_path(SmallVectorImpl<char> &result) { |
| SmallVector<wchar_t, 128> cur_path; |
| cur_path.reserve(128); |
| retry_cur_dir: |
| DWORD len = ::GetCurrentDirectoryW(cur_path.capacity(), cur_path.data()); |
| |
| // A zero return value indicates a failure other than insufficient space. |
| if (len == 0) |
| return make_error_code(windows_error(::GetLastError())); |
| |
| // If there's insufficient space, the len returned is larger than the len |
| // given. |
| if (len > cur_path.capacity()) { |
| cur_path.reserve(len); |
| goto retry_cur_dir; |
| } |
| |
| cur_path.set_size(len); |
| // cur_path now holds the current directory in utf-16. Convert to utf-8. |
| |
| // Find out how much space we need. Sadly, this function doesn't return the |
| // size needed unless you tell it the result size is 0, which means you |
| // _always_ have to call it twice. |
| len = ::WideCharToMultiByte(CP_UTF8, NULL, |
| cur_path.data(), cur_path.size(), |
| result.data(), 0, |
| NULL, NULL); |
| |
| if (len == 0) |
| return make_error_code(windows_error(::GetLastError())); |
| |
| result.reserve(len); |
| result.set_size(len); |
| // Now do the actual conversion. |
| len = ::WideCharToMultiByte(CP_UTF8, NULL, |
| cur_path.data(), cur_path.size(), |
| result.data(), result.size(), |
| NULL, NULL); |
| if (len == 0) |
| return make_error_code(windows_error(::GetLastError())); |
| |
| return make_error_code(errc::success); |
| } |
| |
| } // end namespace path |
| |
| namespace fs { |
| |
| error_code copy_file(const Twine &from, const Twine &to, copy_option copt) { |
| // Get arguments. |
| SmallString<128> from_storage; |
| SmallString<128> to_storage; |
| StringRef f = from.toStringRef(from_storage); |
| StringRef t = to.toStringRef(to_storage); |
| |
| // Convert to utf-16. |
| SmallVector<wchar_t, 128> wide_from; |
| SmallVector<wchar_t, 128> wide_to; |
| if (error_code ec = UTF8ToUTF16(f, wide_from)) return ec; |
| if (error_code ec = UTF8ToUTF16(t, wide_to)) return ec; |
| |
| // Copy the file. |
| BOOL res = ::CopyFileW(wide_from.begin(), wide_to.begin(), |
| copt != copy_option::overwrite_if_exists); |
| |
| if (res == 0) |
| return make_error_code(windows_error(::GetLastError())); |
| |
| return make_error_code(errc::success); |
| } |
| |
| error_code create_directory(const Twine &path, bool &existed) { |
| SmallString<128> path_storage; |
| SmallVector<wchar_t, 128> path_utf16; |
| |
| if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage), |
| path_utf16)) |
| return ec; |
| |
| if (!::CreateDirectoryW(path_utf16.begin(), NULL)) { |
| error_code ec = make_error_code(windows_error(::GetLastError())); |
| if (ec == make_error_code(windows_error::already_exists)) |
| existed = true; |
| else |
| return ec; |
| } else |
| existed = false; |
| |
| return make_error_code(errc::success); |
| } |
| |
| error_code create_hard_link(const Twine &to, const Twine &from) { |
| // Get arguments. |
| SmallString<128> from_storage; |
| SmallString<128> to_storage; |
| StringRef f = from.toStringRef(from_storage); |
| StringRef t = to.toStringRef(to_storage); |
| |
| // Convert to utf-16. |
| SmallVector<wchar_t, 128> wide_from; |
| SmallVector<wchar_t, 128> wide_to; |
| if (error_code ec = UTF8ToUTF16(f, wide_from)) return ec; |
| if (error_code ec = UTF8ToUTF16(t, wide_to)) return ec; |
| |
| if (!::CreateHardLinkW(wide_from.begin(), wide_to.begin(), NULL)) |
| return make_error_code(windows_error(::GetLastError())); |
| |
| return make_error_code(errc::success); |
| } |
| |
| error_code create_symlink(const Twine &to, const Twine &from) { |
| // Only do it if the function is available at runtime. |
| if (!create_symbolic_link_api) |
| return make_error_code(errc::function_not_supported); |
| |
| // Get arguments. |
| SmallString<128> from_storage; |
| SmallString<128> to_storage; |
| StringRef f = from.toStringRef(from_storage); |
| StringRef t = to.toStringRef(to_storage); |
| |
| // Convert to utf-16. |
| SmallVector<wchar_t, 128> wide_from; |
| SmallVector<wchar_t, 128> wide_to; |
| if (error_code ec = UTF8ToUTF16(f, wide_from)) return ec; |
| if (error_code ec = UTF8ToUTF16(t, wide_to)) return ec; |
| |
| if (!create_symbolic_link_api(wide_from.begin(), wide_to.begin(), NULL)) |
| return make_error_code(windows_error(::GetLastError())); |
| |
| return make_error_code(errc::success); |
| } |
| |
| error_code remove(const Twine &path, bool &existed) { |
| SmallString<128> path_storage; |
| SmallVector<wchar_t, 128> path_utf16; |
| |
| if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage), |
| path_utf16)) |
| return ec; |
| |
| if (!::DeleteFileW(path_utf16.begin())) { |
| error_code ec = make_error_code(windows_error(::GetLastError())); |
| if (ec != make_error_code(windows_error::file_not_found)) |
| return ec; |
| existed = false; |
| } else |
| existed = true; |
| |
| return make_error_code(errc::success); |
| } |
| |
| error_code exists(const Twine &path, bool &result) { |
| SmallString<128> path_storage; |
| SmallVector<wchar_t, 128> path_utf16; |
| |
| if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage), |
| path_utf16)) |
| return ec; |
| |
| DWORD attributes = ::GetFileAttributesW(path_utf16.begin()); |
| |
| if (attributes == INVALID_FILE_ATTRIBUTES) { |
| // See if the file didn't actually exist. |
| error_code ec = make_error_code(windows_error(::GetLastError())); |
| if (ec != error_code(windows_error::file_not_found) && |
| ec != error_code(windows_error::path_not_found)) |
| return ec; |
| result = false; |
| } else |
| result = true; |
| return make_error_code(errc::success); |
| } |
| |
| error_code unique_file(const Twine &model, int &result_fd, |
| SmallVectorImpl<char> &result_path) { |
| // Use result_path as temp storage. |
| result_path.set_size(0); |
| StringRef m = model.toStringRef(result_path); |
| |
| SmallVector<wchar_t, 128> model_utf16; |
| if (error_code ec = UTF8ToUTF16(m, model_utf16)) return ec; |
| |
| // Make model absolute by prepending a temp directory if it's not already. |
| bool absolute; |
| if (error_code ec = path::is_absolute(m, absolute)) return ec; |
| |
| if (!absolute) { |
| SmallVector<wchar_t, 64> temp_dir; |
| if (error_code ec = TempDir(temp_dir)) return ec; |
| // Handle c: by removing it. |
| if (model_utf16.size() > 2 && model_utf16[1] == L':') { |
| model_utf16.erase(model_utf16.begin(), model_utf16.begin() + 2); |
| } |
| model_utf16.insert(model_utf16.begin(), temp_dir.begin(), temp_dir.end()); |
| } |
| |
| // Replace '%' with random chars. From here on, DO NOT modify model. It may be |
| // needed if the randomly chosen path already exists. |
| SmallVector<wchar_t, 128> random_path_utf16; |
| |
| // Get a Crypto Provider for CryptGenRandom. |
| AutoCryptoProvider CryptoProvider; |
| BOOL success = ::CryptAcquireContextW(&CryptoProvider.CryptoProvider, |
| NULL, |
| NULL, |
| PROV_RSA_FULL, |
| NULL); |
| if (!success) |
| return make_error_code(windows_error(::GetLastError())); |
| |
| retry_random_path: |
| random_path_utf16.set_size(0); |
| for (SmallVectorImpl<wchar_t>::const_iterator i = model_utf16.begin(), |
| e = model_utf16.end(); |
| i != e; ++i) { |
| if (*i == L'%') { |
| BYTE val = 0; |
| if (!::CryptGenRandom(CryptoProvider, 1, &val)) |
| return make_error_code(windows_error(::GetLastError())); |
| random_path_utf16.push_back("0123456789abcdef"[val & 15]); |
| } |
| else |
| random_path_utf16.push_back(*i); |
| } |
| // Make random_path_utf16 null terminated. |
| random_path_utf16.push_back(0); |
| random_path_utf16.pop_back(); |
| |
| // Try to create + open the path. |
| retry_create_file: |
| HANDLE TempFileHandle = ::CreateFileW(random_path_utf16.begin(), |
| GENERIC_READ | GENERIC_WRITE, |
| FILE_SHARE_READ, |
| NULL, |
| // Return ERROR_FILE_EXISTS if the file |
| // already exists. |
| CREATE_NEW, |
| FILE_ATTRIBUTE_TEMPORARY, |
| NULL); |
| if (TempFileHandle == INVALID_HANDLE_VALUE) { |
| // If the file existed, try again, otherwise, error. |
| error_code ec = make_error_code(windows_error(::GetLastError())); |
| if (ec == error_code(windows_error::file_exists)) |
| goto retry_random_path; |
| // Check for non-existing parent directories. |
| if (ec == error_code(windows_error::path_not_found)) { |
| // Create the directories using result_path as temp storage. |
| if (error_code ec = UTF16ToUTF8(random_path_utf16.begin(), |
| random_path_utf16.size(), result_path)) |
| return ec; |
| StringRef p(result_path.begin(), result_path.size()); |
| SmallString<64> dir_to_create; |
| for (path::const_iterator i = path::begin(p), |
| e = --path::end(p); i != e; ++i) { |
| if (error_code ec = path::append(dir_to_create, *i)) return ec; |
| bool Exists; |
| if (error_code ec = exists(Twine(dir_to_create), Exists)) return ec; |
| if (!Exists) { |
| // If c: doesn't exist, bail. |
| if (i->endswith(":")) |
| return ec; |
| |
| SmallVector<wchar_t, 64> dir_to_create_utf16; |
| if (error_code ec = UTF8ToUTF16(dir_to_create, dir_to_create_utf16)) |
| return ec; |
| |
| // Create the directory. |
| if (!::CreateDirectoryW(dir_to_create_utf16.begin(), NULL)) |
| return make_error_code(windows_error(::GetLastError())); |
| } |
| } |
| goto retry_create_file; |
| } |
| return ec; |
| } |
| |
| // Set result_path to the utf-8 representation of the path. |
| if (error_code ec = UTF16ToUTF8(random_path_utf16.begin(), |
| random_path_utf16.size(), result_path)) { |
| ::CloseHandle(TempFileHandle); |
| ::DeleteFileW(random_path_utf16.begin()); |
| return ec; |
| } |
| |
| // Convert the Windows API file handle into a C-runtime handle. |
| int fd = ::_open_osfhandle(intptr_t(TempFileHandle), 0); |
| if (fd == -1) { |
| ::CloseHandle(TempFileHandle); |
| ::DeleteFileW(random_path_utf16.begin()); |
| // MSDN doesn't say anything about _open_osfhandle setting errno or |
| // GetLastError(), so just return invalid_handle. |
| return make_error_code(windows_error::invalid_handle); |
| } |
| |
| result_fd = fd; |
| return make_error_code(errc::success); |
| } |
| } // end namespace fs |
| } // end namespace sys |
| } // end namespace llvm |