| /* |
| * Copyright (c) 2017, The Linux Foundation. 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 The Linux Foundation 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 "AS IS" AND ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT |
| * 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. |
| */ |
| |
| #ifndef _FILE_READER_H_ |
| #define _FILE_READER_H_ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string> |
| |
| // ************************************************************************************************* |
| |
| // Reads a file from the file system and exports its content to a buffer provided by the caller. |
| // If the file is larger than a provide bugffer, it is delivered by chunks of the buffer size. |
| // The last chunk may occupy less than the whole buffer. It's a caller's responsibility to allocate |
| // the buffer and call the FileReader API untill the file is fully exported. |
| |
| class FileReader |
| { |
| public: |
| |
| explicit FileReader(const char* pFileName); |
| ~FileReader(); |
| |
| size_t ReadChunk(char* pBuf, size_t availableSpace); |
| |
| bool IsCompleted() const { return m_ReadTillNow == m_FileSize; } |
| bool IsError() const { return m_IsError; } |
| |
| size_t ReadTillNow() const { return m_ReadTillNow; } |
| size_t GetFileSize() const { return m_FileSize; } |
| |
| private: |
| |
| bool CanReadFromFile(char* pBuf, size_t availableSpace); |
| |
| const std::string m_FileName; // File name - cached for tracing |
| FILE* m_pFile; // File Handler - open for read |
| size_t m_FileSize; // File Size in bytes |
| size_t m_ReadTillNow; // Bytes read till now |
| bool m_IsCompleted; // Set to true when OEF is reached |
| bool m_IsError; // Error flag |
| |
| }; |
| |
| |
| #endif // _FILE_READER_H_ |