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      1 /*
      2  * Copyright (C) 2003, 2006, 2008, 2009, 2010, 2012 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  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 
     27 #include "config.h"
     28 #include "CString.h"
     29 
     30 #include "wtf/PartitionAlloc.h"
     31 #include "wtf/WTF.h"
     32 #include <string.h>
     33 
     34 using namespace std;
     35 
     36 namespace WTF {
     37 
     38 PassRefPtr<CStringBuffer> CStringBuffer::createUninitialized(size_t length)
     39 {
     40     RELEASE_ASSERT(length < (numeric_limits<unsigned>::max() - sizeof(CStringBuffer)));
     41 
     42     // The +1 is for the terminating NUL character.
     43     size_t size = sizeof(CStringBuffer) + length + 1;
     44     CStringBuffer* stringBuffer = static_cast<CStringBuffer*>(partitionAllocGeneric(Partitions::getBufferPartition(), size));
     45     return adoptRef(new (stringBuffer) CStringBuffer(length));
     46 }
     47 
     48 void CStringBuffer::operator delete(void* ptr)
     49 {
     50     partitionFreeGeneric(Partitions::getBufferPartition(), ptr);
     51 }
     52 
     53 CString::CString(const char* str)
     54 {
     55     if (!str)
     56         return;
     57 
     58     init(str, strlen(str));
     59 }
     60 
     61 CString::CString(const char* str, size_t length)
     62 {
     63     if (!str) {
     64         ASSERT(!length);
     65         return;
     66     }
     67 
     68     init(str, length);
     69 }
     70 
     71 void CString::init(const char* str, size_t length)
     72 {
     73     ASSERT(str);
     74 
     75     m_buffer = CStringBuffer::createUninitialized(length);
     76     memcpy(m_buffer->mutableData(), str, length);
     77     m_buffer->mutableData()[length] = '\0';
     78 }
     79 
     80 char* CString::mutableData()
     81 {
     82     copyBufferIfNeeded();
     83     if (!m_buffer)
     84         return 0;
     85     return m_buffer->mutableData();
     86 }
     87 
     88 CString CString::newUninitialized(size_t length, char*& characterBuffer)
     89 {
     90     CString result;
     91     result.m_buffer = CStringBuffer::createUninitialized(length);
     92     char* bytes = result.m_buffer->mutableData();
     93     bytes[length] = '\0';
     94     characterBuffer = bytes;
     95     return result;
     96 }
     97 
     98 void CString::copyBufferIfNeeded()
     99 {
    100     if (!m_buffer || m_buffer->hasOneRef())
    101         return;
    102 
    103     RefPtr<CStringBuffer> buffer = m_buffer.release();
    104     size_t length = buffer->length();
    105     m_buffer = CStringBuffer::createUninitialized(length);
    106     memcpy(m_buffer->mutableData(), buffer->data(), length + 1);
    107 }
    108 
    109 bool CString::isSafeToSendToAnotherThread() const
    110 {
    111     return !m_buffer || m_buffer->hasOneRef();
    112 }
    113 
    114 bool operator==(const CString& a, const CString& b)
    115 {
    116     if (a.isNull() != b.isNull())
    117         return false;
    118     if (a.length() != b.length())
    119         return false;
    120     return !memcmp(a.data(), b.data(), a.length());
    121 }
    122 
    123 bool operator==(const CString& a, const char* b)
    124 {
    125     if (a.isNull() != !b)
    126         return false;
    127     if (!b)
    128         return true;
    129     return !strcmp(a.data(), b);
    130 }
    131 
    132 } // namespace WTF
    133