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 "ArrayBufferView.h"
28
29 #include "ArrayBuffer.h"
30
31 namespace WebCore {
32
ArrayBufferView(PassRefPtr<ArrayBuffer> buffer,unsigned byteOffset)33 ArrayBufferView::ArrayBufferView(PassRefPtr<ArrayBuffer> buffer,
34 unsigned byteOffset)
35 : m_byteOffset(byteOffset)
36 , m_buffer(buffer)
37 {
38 m_baseAddress = m_buffer ? (static_cast<char*>(m_buffer->data()) + m_byteOffset) : 0;
39 }
40
~ArrayBufferView()41 ArrayBufferView::~ArrayBufferView()
42 {
43 }
44
setImpl(ArrayBufferView * array,unsigned byteOffset,ExceptionCode & ec)45 void ArrayBufferView::setImpl(ArrayBufferView* array, unsigned byteOffset, ExceptionCode& ec)
46 {
47 if (byteOffset > byteLength()
48 || byteOffset + array->byteLength() > byteLength()
49 || byteOffset + array->byteLength() < byteOffset) {
50 // Out of range offset or overflow
51 ec = INDEX_SIZE_ERR;
52 return;
53 }
54
55 char* base = static_cast<char*>(baseAddress());
56 memmove(base + byteOffset, array->baseAddress(), array->byteLength());
57 }
58
setRangeImpl(const char * data,size_t dataByteLength,unsigned byteOffset,ExceptionCode & ec)59 void ArrayBufferView::setRangeImpl(const char* data, size_t dataByteLength, unsigned byteOffset, ExceptionCode& ec)
60 {
61 if (byteOffset > byteLength()
62 || byteOffset + dataByteLength > byteLength()
63 || byteOffset + dataByteLength < byteOffset) {
64 // Out of range offset or overflow
65 ec = INDEX_SIZE_ERR;
66 return;
67 }
68
69 char* base = static_cast<char*>(baseAddress());
70 memmove(base + byteOffset, data, dataByteLength);
71 }
72
zeroRangeImpl(unsigned byteOffset,size_t rangeByteLength,ExceptionCode & ec)73 void ArrayBufferView::zeroRangeImpl(unsigned byteOffset, size_t rangeByteLength, ExceptionCode& ec)
74 {
75 if (byteOffset > byteLength()
76 || byteOffset + rangeByteLength > byteLength()
77 || byteOffset + rangeByteLength < byteOffset) {
78 // Out of range offset or overflow
79 ec = INDEX_SIZE_ERR;
80 return;
81 }
82
83 char* base = static_cast<char*>(baseAddress());
84 memset(base + byteOffset, 0, rangeByteLength);
85 }
86
calculateOffsetAndLength(int start,int end,unsigned arraySize,unsigned * offset,unsigned * length)87 void ArrayBufferView::calculateOffsetAndLength(int start, int end, unsigned arraySize,
88 unsigned* offset, unsigned* length)
89 {
90 if (start < 0)
91 start += arraySize;
92 if (start < 0)
93 start = 0;
94 if (end < 0)
95 end += arraySize;
96 if (end < 0)
97 end = 0;
98 if (end < start)
99 end = start;
100 *offset = static_cast<unsigned>(start);
101 *length = static_cast<unsigned>(end - start);
102 }
103
104 }
105