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
createUninitialized(size_t length)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
operator delete(void * ptr)48 void CStringBuffer::operator delete(void* ptr)
49 {
50 partitionFreeGeneric(Partitions::getBufferPartition(), ptr);
51 }
52
CString(const char * str)53 CString::CString(const char* str)
54 {
55 if (!str)
56 return;
57
58 init(str, strlen(str));
59 }
60
CString(const char * str,size_t length)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
init(const char * str,size_t length)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
mutableData()80 char* CString::mutableData()
81 {
82 copyBufferIfNeeded();
83 if (!m_buffer)
84 return 0;
85 return m_buffer->mutableData();
86 }
87
newUninitialized(size_t length,char * & characterBuffer)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
copyBufferIfNeeded()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
isSafeToSendToAnotherThread() const109 bool CString::isSafeToSendToAnotherThread() const
110 {
111 return !m_buffer || m_buffer->hasOneRef();
112 }
113
operator ==(const CString & a,const CString & b)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
operator ==(const CString & a,const char * b)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