text: /*
   * Copyright (C) 2008 Apple Inc. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1.  Redistributions of source code must retain the above copyright
   *     notice, this list of conditions and the following disclaimer. 
   * 2.  Redistributions in binary form must reproduce the above copyright
   *     notice, this list of conditions and the following disclaimer in the
   *     documentation and/or other materials provided with the distribution. 
   * 3.  Neither the name of Apple Inc. ("Apple") nor the names of its
   *     contributors may be used to endorse or promote products derived
   *     from this software without specific prior written permission. 
   *
   * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
   * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #ifndef StringBuffer_h
  #define StringBuffer_h
  
  #include <wtf/Assertions.h>
  #include <wtf/Noncopyable.h>
  #include <wtf/unicode/Unicode.h>
  
  namespace WebCore {
  
  class StringBuffer : public Noncopyable {
  public:
      explicit StringBuffer(unsigned length)
          : m_length(length)
          , m_data(static_cast<UChar*>(fastMalloc(length * sizeof(UChar))))
      {
      }
      ~StringBuffer()
      {
          fastFree(m_data);
      }
  
      void shrink(unsigned newLength)
      {
          ASSERT(newLength <= m_length);
          m_length = newLength;
      }
  
      void resize(unsigned newLength)
      {
          if (newLength > m_length)
              m_data = static_cast<UChar*>(fastRealloc(m_data, newLength * sizeof(UChar)));
          m_length = newLength;
      }
  
      unsigned length() const { return m_length; }
      UChar* characters() { return m_data; }
  
      UChar& operator[](unsigned i) { ASSERT(i < m_length); return m_data[i]; }
  
      UChar* release() { UChar* data = m_data; m_data = 0; return data; }
  
  private:
      unsigned m_length;
      UChar* m_data;
  };
  
  }
  
  #endif
  