memorybuffer.h

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// 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_MEMORYBUFFER_H_
#define RAPIDJSON_MEMORYBUFFER_H_

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

RAPIDJSON_NAMESPACE_BEGIN


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;

template<>
inline void PutN(MemoryBuffer& memoryBuffer, char c, size_t n) {
 std::memset(memoryBuffer.stack_.Push<char>(n), c, n * sizeof(c));
}

RAPIDJSON_NAMESPACE_END

#endif // RAPIDJSON_MEMORYBUFFER_H_