| // Copyright 2010-2015, Google Inc. |
| // All rights reserved. |
| // |
| // 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. |
| |
| #include "base/mmap.h" |
| |
| #ifdef OS_WIN |
| #include <Windows.h> |
| #include <string> |
| #else |
| #include <fcntl.h> |
| #include <sys/mman.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| #endif // OS_WIN |
| |
| #include <cstring> |
| |
| #include "base/port.h" |
| #include "base/logging.h" |
| #include "base/system_util.h" |
| #include "base/util.h" |
| |
| #ifdef OS_WIN |
| #include "base/scoped_handle.h" |
| #endif // OS_WIN |
| |
| #ifdef MOZC_USE_PEPPER_FILE_IO |
| #include "base/pepper_file_util.h" |
| #endif // MOZC_USE_PEPPER_FILE_IO |
| |
| namespace mozc { |
| |
| #ifndef MOZC_USE_PEPPER_FILE_IO |
| |
| Mmap::Mmap() : text_(NULL), size_(0) { |
| } |
| |
| #ifdef OS_WIN |
| |
| bool Mmap::Open(const char *filename, const char *mode) { |
| Close(); |
| uint32 mode1, mode2, mode3, mode4; |
| if (strcmp(mode, "r") == 0) { |
| mode1 = GENERIC_READ; |
| mode2 = PAGE_READONLY; |
| mode3 = FILE_MAP_READ; |
| mode4 = FILE_SHARE_READ; |
| } else if (strcmp(mode, "r+") == 0) { |
| mode1 = GENERIC_READ | GENERIC_WRITE; |
| mode2 = PAGE_READWRITE; |
| mode3 = FILE_MAP_ALL_ACCESS; |
| mode4 = FILE_SHARE_READ | FILE_SHARE_WRITE; |
| } else { |
| LOG(ERROR) << "unknown open mode:" << filename; |
| return false; |
| } |
| |
| wstring filename_wide; |
| if (Util::UTF8ToWide(filename, &filename_wide) <= 0) { |
| return false; |
| } |
| |
| ScopedHandle handle( |
| ::CreateFileW(filename_wide.c_str(), mode1, mode4, |
| 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0)); |
| if (handle.get() == NULL) { |
| LOG(ERROR) << "CreateFile() failed: " << filename; |
| return false; |
| } |
| |
| ScopedHandle map_handle( |
| ::CreateFileMapping(handle.get(), 0, mode2, 0, 0, 0)); |
| if (map_handle.get() == NULL) { |
| LOG(ERROR) << "CreateFileMapping() failed: " << filename; |
| return false; |
| } |
| |
| void *ptr = ::MapViewOfFile(map_handle.get(), mode3, 0, 0, 0); |
| if (ptr == NULL) { |
| LOG(ERROR) << "MapViewOfFile() failed: " << filename; |
| return false; |
| } |
| |
| text_ = reinterpret_cast<char *>(ptr); |
| size_ = ::GetFileSize(handle.get(), 0); |
| |
| return true; |
| } |
| |
| void Mmap::Close() { |
| if (text_ != NULL) { |
| ::UnmapViewOfFile(text_); |
| } |
| |
| text_ = NULL; |
| size_ = 0; |
| } |
| |
| #else // OS_WIN |
| |
| #ifndef O_BINARY |
| #define O_BINARY 0 |
| #endif |
| |
| namespace { |
| class ScopedCloser { |
| public: |
| explicit ScopedCloser(int fd) : fd_(fd) { |
| } |
| ~ScopedCloser() { |
| ::close(fd_); |
| } |
| private: |
| int fd_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ScopedCloser); |
| }; |
| } // namespace |
| |
| bool Mmap::Open(const char *filename, const char *mode) { |
| Close(); |
| |
| int flag; |
| if (strcmp(mode, "r") == 0) { |
| flag = O_RDONLY; |
| } else if (strcmp(mode, "r+") == 0) { |
| flag = O_RDWR; |
| } else { |
| LOG(WARNING) << "unknown open mode: " << filename; |
| return false; |
| } |
| |
| int fd = ::open(filename, flag | O_BINARY); |
| if (fd < 0) { |
| LOG(WARNING) << "open failed: " << filename; |
| return false; |
| } |
| ScopedCloser closer(fd); |
| |
| struct stat st; |
| if (fstat(fd, &st) < 0) { |
| LOG(WARNING) << "failed to get file size: " << filename; |
| return false; |
| } |
| |
| int prot = PROT_READ; |
| if (flag == O_RDWR) { |
| prot |= PROT_WRITE; |
| } |
| |
| void *ptr = mmap(0, st.st_size, prot, MAP_SHARED, fd, 0); |
| if (ptr == MAP_FAILED) { |
| LOG(WARNING) << "mmap() failed: " << filename; |
| return false; |
| } |
| |
| SystemUtil::MaybeMLock(ptr, size_); |
| text_ = reinterpret_cast<char *>(ptr); |
| size_ = st.st_size; |
| return true; |
| } |
| |
| void Mmap::Close() { |
| if (text_ != NULL) { |
| SystemUtil::MaybeMUnlock(text_, size_); |
| munmap(reinterpret_cast<char *>(text_), size_); |
| } |
| |
| text_ = NULL; |
| size_ = 0; |
| } |
| #endif // OS_WIN |
| |
| #else // MOZC_USE_PEPPER_FILE_IO |
| |
| Mmap::Mmap() : write_mode_(false), size_(0) { |
| } |
| |
| bool Mmap::Open(const char *filename, const char *mode) { |
| Close(); |
| |
| if (strcmp(mode, "r") == 0) { |
| write_mode_ = false; |
| } else if (strcmp(mode, "r+") == 0) { |
| write_mode_ = true; |
| } else { |
| LOG(WARNING) << "unknown open mode: " << filename; |
| return false; |
| } |
| string buffer; |
| if (!PepperFileUtil::ReadBinaryFile(filename, &buffer)) { |
| LOG(WARNING) << "read failed: " << filename; |
| return false; |
| } |
| if (buffer.empty()) { |
| LOG(WARNING) << "file size = 0: " << filename; |
| return false; |
| } |
| size_ = buffer.size(); |
| text_.reset(new char[size_]); |
| buffer.copy(text_.get(), size_); |
| filename_ = filename; |
| if (write_mode_) { |
| PepperFileUtil::RegisterMmap(this); |
| } |
| return true; |
| } |
| |
| void Mmap::Close() { |
| if (write_mode_) { |
| PepperFileUtil::UnRegisterMmap(this); |
| if (!PepperFileUtil::WriteBinaryFile(filename_, |
| string(text_.get(), size_))) { |
| LOG(WARNING) << "write failed: " << filename_; |
| } |
| } |
| text_.reset(); |
| size_ = 0; |
| } |
| |
| bool Mmap::SyncToFile() { |
| if (!write_mode_) { |
| LOG(ERROR) << "Mmap::SyncToFile error. This file is opened in read mode: " |
| << filename_; |
| return false; |
| } |
| return PepperFileUtil::WriteBinaryFile(filename_, |
| string(text_.get(), size_)); |
| } |
| #endif // MOZC_USE_PEPPER_FILE_IO |
| |
| } // namespace mozc |