text: /****************************************************************************
   Copyright (c) 2010-2012 cocos2d-x.org
   Copyright (c) 2013-2016 Chukong Technologies Inc.
   Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
  
   http://www.cocos2d-x.org
  
   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.
   ****************************************************************************/
  
  #include "base/CCData.h"
  #include "base/CCConsole.h"
  
  NS_CC_BEGIN
  
  const Data Data::Null;
  
  Data::Data() :
  _bytes(nullptr),
  _size(0)
  {
      CCLOGINFO("In the empty constructor of Data.");
  }
  
  Data::Data(Data&& other) :
  _bytes(nullptr),
  _size(0)
  {
      CCLOGINFO("In the move constructor of Data.");
      move(other);
  }
  
  Data::Data(const Data& other) :
  _bytes(nullptr),
  _size(0)
  {
      CCLOGINFO("In the copy constructor of Data.");
      if (other._bytes && other._size)
      {
          copy(other._bytes, other._size);
      }
  }
  
  Data::~Data()
  {
      CCLOGINFO("deallocing Data: %p", this);
      clear();
  }
  
  Data& Data::operator= (const Data& other)
  {
      if (this != &other)
      {
          CCLOGINFO("In the copy assignment of Data.");
          copy(other._bytes, other._size);
      }
      return *this;
  }
  
  Data& Data::operator= (Data&& other)
  {
      if (this != &other)
      {
          CCLOGINFO("In the move assignment of Data.");
          move(other);
      }
      return *this;
  }
  
  void Data::move(Data& other)
  {
      if(_bytes != other._bytes) clear();
      
      _bytes = other._bytes;
      _size = other._size;
  
      other._bytes = nullptr;
      other._size = 0;
  }
  
  bool Data::isNull() const
  {
      return (_bytes == nullptr || _size == 0);
  }
  
  unsigned char* Data::getBytes() const
  {
      return _bytes;
  }
  
  ssize_t Data::getSize() const
  {
      return _size;
  }
  
  ssize_t Data::copy(const unsigned char* bytes, const ssize_t size)
  {
      CCASSERT(size >= 0, "copy size should be non-negative");
      CCASSERT(bytes, "bytes should not be nullptr");
  
      if (size <= 0) return 0;
  
      if (bytes != _bytes)
      {
          clear();
          _bytes = (unsigned char*)malloc(sizeof(unsigned char) * size);
          memcpy(_bytes, bytes, size);
      }
  
      _size = size;
      return _size;
  }
  
  void Data::fastSet(unsigned char* bytes, const ssize_t size)
  {
      CCASSERT(size >= 0, "fastSet size should be non-negative");
      //CCASSERT(bytes, "bytes should not be nullptr");
      _bytes = bytes;
      _size = size;
  }
  
  void Data::clear()
  {
      if(_bytes) free(_bytes);
      _bytes = nullptr;
      _size = 0;
  }
  
  unsigned char* Data::takeBuffer(ssize_t* size)
  {
      auto buffer = getBytes();
      if (size)
          *size = getSize();
      fastSet(nullptr, 0);
      return buffer;
  }
  
  NS_CC_END
  