Differential D793 Diff 2592 extern/rapidjson/include/rapidjson/filewritestream.h

Changeset View

Standalone View

extern/rapidjson/include/rapidjson/filewritestream.h

This file was added.

				// Copyright (C) 2011 Milo Yip
				//
				// Permission is hereby granted, free of charge, to any person obtaining a copy
				// of this software and associated documentation files (the "Software"), to deal
				// in the Software without restriction, including without limitation the rights
				// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
				// copies of the Software, and to permit persons to whom the Software is
				// furnished to do so, subject to the following conditions:
				//
				// The above copyright notice and this permission notice shall be included in
				// all copies or substantial portions of the Software.
				//
				// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
				// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
				// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
				// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
				// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
				// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
				// THE SOFTWARE.

				#ifndef RAPIDJSON_FILEWRITESTREAM_H_
				#define RAPIDJSON_FILEWRITESTREAM_H_

				#include "rapidjson.h"
				#include <cstdio>

				namespace rapidjson {

				//! 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(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) {
				memset(current_, c, avail);
				current_ += avail;
				Flush();
				n -= avail;
				avail = static_cast<size_t>(bufferEnd_ - current_);
				}

				if (n > 0) {
				memset(current_, c, n);
				current_ += n;
				}
				}

				void Flush() {
				if (current_ != buffer_) {
				fwrite(buffer_, 1, static_cast<size_t>(current_ - buffer_), fp_);
				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&);

				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);
				}

				} // namespace rapidjson

				#endif // RAPIDJSON_FILESTREAM_H_