// 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 "rapidjson.h" | |
#include <cstdio> | |
RAPIDJSON_NAMESPACE_BEGIN | |
//! Wrapper of C file stream for input using fread(). | |
/*! | |
\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 = 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 | |
#endif // RAPIDJSON_FILESTREAM_H_ |