| /* |
| * Copyright (C) 2013, The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "dictionary/utils/mmapped_buffer.h" |
| |
| #include <cerrno> |
| #include <climits> |
| #include <cstdio> |
| #include <fcntl.h> |
| #include <sys/mman.h> |
| #include <unistd.h> |
| |
| #include "dictionary/utils/file_utils.h" |
| |
| namespace latinime { |
| |
| /* static */ MmappedBuffer::MmappedBufferPtr MmappedBuffer::openBuffer( |
| const char *const path, const int bufferOffset, const int bufferSize, |
| const bool isUpdatable) { |
| const int mmapFd = open(path, O_RDONLY); |
| if (mmapFd < 0) { |
| AKLOGE("DICT: Can't open the source. path=%s errno=%d", path, errno); |
| return nullptr; |
| } |
| const int pagesize = sysconf(_SC_PAGESIZE); |
| const int offset = bufferOffset % pagesize; |
| int alignedOffset = bufferOffset - offset; |
| int alignedSize = bufferSize + offset; |
| const int protMode = isUpdatable ? PROT_READ | PROT_WRITE : PROT_READ; |
| void *const mmappedBuffer = mmap(0, alignedSize, protMode, MAP_PRIVATE, mmapFd, |
| alignedOffset); |
| if (mmappedBuffer == MAP_FAILED) { |
| AKLOGE("DICT: Can't mmap dictionary. errno=%d", errno); |
| close(mmapFd); |
| return nullptr; |
| } |
| uint8_t *const buffer = static_cast<uint8_t *>(mmappedBuffer) + offset; |
| if (!buffer) { |
| AKLOGE("DICT: buffer is null"); |
| close(mmapFd); |
| return nullptr; |
| } |
| return MmappedBufferPtr(new MmappedBuffer(buffer, bufferSize, mmappedBuffer, alignedSize, |
| mmapFd, isUpdatable)); |
| } |
| |
| /* static */ MmappedBuffer::MmappedBufferPtr MmappedBuffer::openBuffer( |
| const char *const path, const bool isUpdatable) { |
| const int fileSize = FileUtils::getFileSize(path); |
| if (fileSize == -1) { |
| return nullptr; |
| } else if (fileSize == 0) { |
| return MmappedBufferPtr(new MmappedBuffer(isUpdatable)); |
| } else { |
| return openBuffer(path, 0 /* bufferOffset */, fileSize, isUpdatable); |
| } |
| } |
| |
| /* static */ MmappedBuffer::MmappedBufferPtr MmappedBuffer::openBuffer( |
| const char *const dirPath, const char *const fileName, const bool isUpdatable) { |
| const int filePathBufferSize = PATH_MAX + 1 /* terminator */; |
| char filePath[filePathBufferSize]; |
| const int filePathLength = snprintf(filePath, filePathBufferSize, "%s%s", dirPath, |
| fileName); |
| if (filePathLength >= filePathBufferSize) { |
| return nullptr; |
| } |
| return openBuffer(filePath, isUpdatable); |
| } |
| |
| MmappedBuffer::~MmappedBuffer() { |
| if (mAlignedSize == 0) { |
| return; |
| } |
| int ret = munmap(mMmappedBuffer, mAlignedSize); |
| if (ret != 0) { |
| AKLOGE("DICT: Failure in munmap. ret=%d errno=%d", ret, errno); |
| } |
| ret = close(mMmapFd); |
| if (ret != 0) { |
| AKLOGE("DICT: Failure in close. ret=%d errno=%d", ret, errno); |
| } |
| } |
| |
| } // namespace latinime |