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 "stream.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_