| /******************************************************************** |
| * 2014 - |
| * open source under Apache License Version 2.0 |
| ********************************************************************/ |
| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| #ifndef _HDFS_LIBHDFS3_COMMON_FILEWRAPPER_H_ |
| #define _HDFS_LIBHDFS3_COMMON_FILEWRAPPER_H_ |
| |
| #include <string> |
| #include <cassert> |
| #include <cstdio> |
| #include <string> |
| #include <vector> |
| |
| namespace Hdfs { |
| namespace Internal { |
| |
| class FileWrapper { |
| public: |
| virtual ~FileWrapper() { |
| } |
| |
| virtual bool open(int fd, bool delegate) = 0; |
| virtual bool open(const std::string & path) = 0; |
| virtual void close() = 0; |
| virtual const char * read(std::vector<char> & buffer, int32_t size) = 0; |
| virtual void copy(char * buffer, int32_t size) = 0; |
| virtual void seek(int64_t position) = 0; |
| }; |
| |
| class CFileWrapper: public FileWrapper { |
| public: |
| CFileWrapper(); |
| ~CFileWrapper(); |
| bool open(int fd, bool delegate); |
| bool open(const std::string & path); |
| void close(); |
| const char * read(std::vector<char> & buffer, int32_t size); |
| void copy(char * buffer, int32_t size); |
| void seek(int64_t offset); |
| |
| private: |
| FILE * file; |
| std::string path; |
| }; |
| |
| class MappedFileWrapper: public FileWrapper { |
| public: |
| MappedFileWrapper(); |
| ~MappedFileWrapper(); |
| bool open(int fd, bool delegate); |
| bool open(const std::string & path); |
| void close(); |
| const char * read(std::vector<char> & buffer, int32_t size); |
| void copy(char * buffer, int32_t size); |
| void seek(int64_t offset); |
| |
| private: |
| bool openInternal(int fd, bool delegate, size_t size); |
| |
| private: |
| bool delegate; |
| const char * begin; |
| const char * position; |
| int fd; |
| int64_t size; |
| std::string path; |
| }; |
| |
| } |
| } |
| |
| #endif /* _HDFS_LIBHDFS3_COMMON_FILEWRAPPER_H_ */ |