text: // 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_
  