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 : public 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