WebCore/StringBuffer.h

   1 /*
   2  * Copyright (C) 2008 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * 1.  Redistributions of source code must retain the above copyright
   9  *     notice, this list of conditions and the following disclaimer.
  10  * 2.  Redistributions in binary form must reproduce the above copyright
  11  *     notice, this list of conditions and the following disclaimer in the
  12  *     documentation and/or other materials provided with the distribution.
  13  * 3.  Neither the name of Apple Inc. ("Apple") nor the names of its
  14  *     contributors may be used to endorse or promote products derived
  15  *     from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #ifndef StringBuffer_h
  30 #define StringBuffer_h
  31
  32 #include <wtf/Assertions.h>
  33 #include <wtf/Noncopyable.h>
  34 #include <wtf/unicode/Unicode.h>
  35
  36 namespace WebCore {
  37
  38 class StringBuffer : Noncopyable {
  39 public:
  40     explicit StringBuffer(unsigned length)
  41         : m_length(length)
  42         , m_data(static_cast<UChar*>(fastMalloc(length * sizeof(UChar))))
  43     {
  44     }
  45     ~StringBuffer()
  46     {
  47         fastFree(m_data);
  48     }
  49
  50     void shrink(unsigned newLength)
  51     {
  52         ASSERT(newLength <= m_length);
  53         m_length = newLength;
  54     }
  55
  56     void resize(unsigned newLength)
  57     {
  58         if (newLength > m_length)
  59             m_data = static_cast<UChar*>(fastRealloc(m_data, newLength * sizeof(UChar)));
  60         m_length = newLength;
  61     }
  62
  63     unsigned length() const { return m_length; }
  64     UChar* characters() { return m_data; }
  65
  66     UChar& operator[](unsigned i) { ASSERT(i < m_length); return m_data[i]; }
  67
  68     UChar* release() { UChar* data = m_data; m_data = 0; return data; }
  69
  70 private:
  71     unsigned m_length;
  72     UChar* m_data;
  73 };
  74
  75 }
  76
  77 #endif