| // Tencent is pleased to support the open source community by making RapidJSON available. |
| // |
| // Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved. |
| // |
| // Licensed under the MIT License (the "License"); you may not use this file except |
| // in compliance with the License. You may obtain a copy of the License at |
| // |
| // http://opensource.org/licenses/MIT |
| // |
| // 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 RAPIDJSON_FILEWRITESTREAM_H_ |
| #define RAPIDJSON_FILEWRITESTREAM_H_ |
| |
| #include "stream.h" |
| #include <cstdio> |
| |
| #ifdef __clang__ |
| RAPIDJSON_DIAG_PUSH |
| RAPIDJSON_DIAG_OFF(unreachable-code) |
| #endif |
| |
| RAPIDJSON_NAMESPACE_BEGIN |
| |
| //! Wrapper of C file stream for output using fwrite(). |
| /*! |
| \note implements Stream concept |
| */ |
| class FileWriteStream { |
| public: |
| typedef char Ch; //!< Character type. Only support char. |
| |
| FileWriteStream(std::FILE* fp, char* buffer, size_t bufferSize) : fp_(fp), buffer_(buffer), bufferEnd_(buffer + bufferSize), current_(buffer_) { |
| RAPIDJSON_ASSERT(fp_ != 0); |
| } |
| |
| void Put(char c) { |
| if (current_ >= bufferEnd_) |
| Flush(); |
| |
| *current_++ = c; |
| } |
| |
| void PutN(char c, size_t n) { |
| size_t avail = static_cast<size_t>(bufferEnd_ - current_); |
| while (n > avail) { |
| std::memset(current_, c, avail); |
| current_ += avail; |
| Flush(); |
| n -= avail; |
| avail = static_cast<size_t>(bufferEnd_ - current_); |
| } |
| |
| if (n > 0) { |
| std::memset(current_, c, n); |
| current_ += n; |
| } |
| } |
| |
| void Flush() { |
| if (current_ != buffer_) { |
| size_t result = std::fwrite(buffer_, 1, static_cast<size_t>(current_ - buffer_), fp_); |
| if (result < static_cast<size_t>(current_ - buffer_)) { |
| // failure deliberately ignored at this time |
| // added to avoid warn_unused_result build errors |
| } |
| current_ = buffer_; |
| } |
| } |
| |
| // Not implemented |
| char Peek() const { RAPIDJSON_ASSERT(false); return 0; } |
| char Take() { RAPIDJSON_ASSERT(false); return 0; } |
| size_t Tell() const { RAPIDJSON_ASSERT(false); return 0; } |
| char* PutBegin() { RAPIDJSON_ASSERT(false); return 0; } |
| size_t PutEnd(char*) { RAPIDJSON_ASSERT(false); return 0; } |
| |
| private: |
| // Prohibit copy constructor & assignment operator. |
| FileWriteStream(const FileWriteStream&); |
| FileWriteStream& operator=(const FileWriteStream&); |
| |
| std::FILE* fp_; |
| char *buffer_; |
| char *bufferEnd_; |
| char *current_; |
| }; |
| |
| //! Implement specialized version of PutN() with memset() for better performance. |
| template<> |
| inline void PutN(FileWriteStream& stream, char c, size_t n) { |
| stream.PutN(c, n); |
| } |
| |
| RAPIDJSON_NAMESPACE_END |
| |
| #ifdef __clang__ |
| RAPIDJSON_DIAG_POP |
| #endif |
| |
| #endif // RAPIDJSON_FILESTREAM_H_ |