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

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extern/rapidjson/include/rapidjson/memorybuffer.h

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				// 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_MEMORYBUFFER_H_
				#define RAPIDJSON_MEMORYBUFFER_H_

				#include "rapidjson.h"
				#include "internal/stack.h"

				namespace rapidjson {

				//! Represents an in-memory output byte stream.
				/*!
				This class is mainly for being wrapped by EncodedOutputStream or AutoUTFOutputStream.

				It is similar to FileWriteBuffer but the destination is an in-memory buffer instead of a file.

				Differences between MemoryBuffer and StringBuffer:
				1. StringBuffer has Encoding but MemoryBuffer is only a byte buffer.
				2. StringBuffer::GetString() returns a null-terminated string. MemoryBuffer::GetBuffer() returns a buffer without terminator.

				\tparam Allocator type for allocating memory buffer.
				\note implements Stream concept
				*/
				template <typename Allocator = CrtAllocator>
				struct GenericMemoryBuffer {
				typedef char Ch; // byte

				GenericMemoryBuffer(Allocator* allocator = 0, size_t capacity = kDefaultCapacity) : stack_(allocator, capacity) {}

				void Put(Ch c) { *stack_.template Push<Ch>() = c; }
				void Flush() {}

				void Clear() { stack_.Clear(); }
				void ShrinkToFit() { stack_.ShrinkToFit(); }
				Ch* Push(size_t count) { return stack_.template Push<Ch>(count); }
				void Pop(size_t count) { stack_.template Pop<Ch>(count); }

				const Ch* GetBuffer() const {
				return stack_.template Bottom<Ch>();
				}

				size_t GetSize() const { return stack_.GetSize(); }

				static const size_t kDefaultCapacity = 256;
				mutable internal::Stack<Allocator> stack_;
				};

				typedef GenericMemoryBuffer<> MemoryBuffer;

				//! Implement specialized version of PutN() with memset() for better performance.
				template<>
				inline void PutN(MemoryBuffer& memoryBuffer, char c, size_t n) {
				memset(memoryBuffer.stack_.Push<char>(n), c, n * sizeof(c));
				}

				} // namespace rapidjson

				#endif // RAPIDJSON_MEMORYBUFFER_H_