1 /*
2 * Copyright (C) 2009 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 #include "config.h"
27 #include "ArrayBuffer.h"
28
29 #include <wtf/RefPtr.h>
30
31 namespace WebCore {
32
create(unsigned numElements,unsigned elementByteSize)33 PassRefPtr<ArrayBuffer> ArrayBuffer::create(unsigned numElements, unsigned elementByteSize)
34 {
35 void* data = tryAllocate(numElements, elementByteSize);
36 if (!data)
37 return 0;
38 return adoptRef(new ArrayBuffer(data, numElements * elementByteSize));
39 }
40
create(ArrayBuffer * other)41 PassRefPtr<ArrayBuffer> ArrayBuffer::create(ArrayBuffer* other)
42 {
43 return ArrayBuffer::create(other->data(), other->byteLength());
44 }
45
create(void * source,unsigned byteLength)46 PassRefPtr<ArrayBuffer> ArrayBuffer::create(void* source, unsigned byteLength)
47 {
48 void* data = tryAllocate(byteLength, 1);
49 if (!data)
50 return 0;
51 RefPtr<ArrayBuffer> buffer = adoptRef(new ArrayBuffer(data, byteLength));
52 memcpy(buffer->data(), source, byteLength);
53 return buffer.release();
54 }
55
ArrayBuffer(void * data,unsigned sizeInBytes)56 ArrayBuffer::ArrayBuffer(void* data, unsigned sizeInBytes)
57 : m_sizeInBytes(sizeInBytes)
58 , m_data(data)
59 {
60 }
61
data()62 void* ArrayBuffer::data()
63 {
64 return m_data;
65 }
66
data() const67 const void* ArrayBuffer::data() const
68 {
69 return m_data;
70 }
71
byteLength() const72 unsigned ArrayBuffer::byteLength() const
73 {
74 return m_sizeInBytes;
75 }
76
~ArrayBuffer()77 ArrayBuffer::~ArrayBuffer()
78 {
79 WTF::fastFree(m_data);
80 }
81
tryAllocate(unsigned numElements,unsigned elementByteSize)82 void* ArrayBuffer::tryAllocate(unsigned numElements, unsigned elementByteSize)
83 {
84 void* result;
85 // Do not allow 32-bit overflow of the total size.
86 // FIXME: Why not? The tryFastCalloc function already checks its arguments,
87 // and will fail if there is any overflow, so why should we include a
88 // redudant unnecessarily restrictive check here?
89 if (numElements) {
90 unsigned totalSize = numElements * elementByteSize;
91 if (totalSize / numElements != elementByteSize)
92 return 0;
93 }
94 if (WTF::tryFastCalloc(numElements, elementByteSize).getValue(result))
95 return result;
96 return 0;
97 }
98
99 }
100