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
31namespace WebCore {
32
33ArrayBufferView::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
41ArrayBufferView::~ArrayBufferView()
42{
43}
44
45void 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
59void 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
73void 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
87void 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