1 /*
2 * Copyright (C) 2009 Apple Inc. All rights reserved.
3 * Copyright (C) 2013 Google Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #include "config.h"
28 #include "wtf/ArrayBufferContents.h"
29
30 #include "wtf/Assertions.h"
31 #include "wtf/PartitionAlloc.h"
32 #include "wtf/WTF.h"
33 #include <string.h>
34
35 namespace WTF {
36
ArrayBufferContents()37 ArrayBufferContents::ArrayBufferContents()
38 : m_data(0)
39 , m_sizeInBytes(0)
40 , m_deallocationObserver(0) { }
41
ArrayBufferContents(unsigned numElements,unsigned elementByteSize,ArrayBufferContents::InitializationPolicy policy)42 ArrayBufferContents::ArrayBufferContents(unsigned numElements, unsigned elementByteSize, ArrayBufferContents::InitializationPolicy policy)
43 : m_data(0)
44 , m_sizeInBytes(0)
45 , m_deallocationObserver(0)
46 {
47 // Do not allow 32-bit overflow of the total size.
48 if (numElements) {
49 unsigned totalSize = numElements * elementByteSize;
50 if (totalSize / numElements != elementByteSize) {
51 m_data = 0;
52 return;
53 }
54 }
55 allocateMemory(numElements * elementByteSize, policy, m_data);
56 m_sizeInBytes = numElements * elementByteSize;
57 }
58
ArrayBufferContents(void * data,unsigned sizeInBytes,ArrayBufferDeallocationObserver * observer)59 ArrayBufferContents::ArrayBufferContents(
60 void* data, unsigned sizeInBytes, ArrayBufferDeallocationObserver* observer)
61 : m_data(data)
62 , m_sizeInBytes(sizeInBytes)
63 , m_deallocationObserver(observer)
64 {
65 if (!m_data) {
66 ASSERT(!m_sizeInBytes);
67 m_sizeInBytes = 0;
68 // Allow null data if size is 0 bytes, make sure m_data is valid pointer.
69 // (partitionAllocGeneric guarantees valid pointer for size 0)
70 allocateMemory(0, ZeroInitialize, m_data);
71 }
72 }
73
~ArrayBufferContents()74 ArrayBufferContents::~ArrayBufferContents()
75 {
76 freeMemory(m_data, m_sizeInBytes);
77 clear();
78 }
79
clear()80 void ArrayBufferContents::clear()
81 {
82 if (m_data && m_deallocationObserver)
83 m_deallocationObserver->arrayBufferDeallocated(m_sizeInBytes);
84 m_data = 0;
85 m_sizeInBytes = 0;
86 m_deallocationObserver = 0;
87 }
88
transfer(ArrayBufferContents & other)89 void ArrayBufferContents::transfer(ArrayBufferContents& other)
90 {
91 ASSERT(!other.m_data);
92 other.m_data = m_data;
93 other.m_sizeInBytes = m_sizeInBytes;
94 clear();
95 }
96
copyTo(ArrayBufferContents & other)97 void ArrayBufferContents::copyTo(ArrayBufferContents& other)
98 {
99 ASSERT(!other.m_sizeInBytes);
100 other.freeMemory(other.m_data, other.m_sizeInBytes);
101 allocateMemory(m_sizeInBytes, DontInitialize, other.m_data);
102 if (!other.m_data)
103 return;
104 memcpy(other.m_data, m_data, m_sizeInBytes);
105 other.m_sizeInBytes = m_sizeInBytes;
106 }
107
allocateMemory(size_t size,InitializationPolicy policy,void * & data)108 void ArrayBufferContents::allocateMemory(size_t size, InitializationPolicy policy, void*& data)
109 {
110 data = partitionAllocGenericFlags(WTF::Partitions::getBufferPartition(), PartitionAllocReturnNull, size);
111 if (policy == ZeroInitialize && data)
112 memset(data, '\0', size);
113 }
114
freeMemory(void * data,size_t)115 void ArrayBufferContents::freeMemory(void* data, size_t)
116 {
117 partitionFreeGeneric(WTF::Partitions::getBufferPartition(), data);
118 }
119
120 } // namespace WTF
121