1/*
2 * Copyright (C) 2011 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 INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "DecoderAdapter.h"
28
29#include "DataReference.h"
30#include "WebCoreArgumentCoders.h"
31#include <wtf/text/WTFString.h>
32
33namespace WebKit {
34
35DecoderAdapter::DecoderAdapter(const uint8_t* buffer, size_t bufferSize)
36    : m_decoder(CoreIPC::ArgumentDecoder::create(buffer, bufferSize))
37{
38    // Keep format compatibility by decoding an unused uint64_t value
39    // that used to be encoded by the argument encoder.
40    uint64_t value;
41    m_decoder->decode(value);
42    ASSERT(!value);
43}
44
45bool DecoderAdapter::decodeBytes(Vector<uint8_t>& bytes)
46{
47    CoreIPC::DataReference dataReference;
48    if (!m_decoder->decode(dataReference))
49        return false;
50
51    bytes = dataReference.vector();
52    return true;
53}
54
55bool DecoderAdapter::decodeBool(bool& value)
56{
57    return m_decoder->decode(value);
58}
59
60bool DecoderAdapter::decodeUInt16(uint16_t& value)
61{
62    return m_decoder->decode(value);
63}
64
65bool DecoderAdapter::decodeUInt32(uint32_t& value)
66{
67    return m_decoder->decode(value);
68}
69
70bool DecoderAdapter::decodeUInt64(uint64_t& value)
71{
72    return m_decoder->decode(value);
73}
74
75bool DecoderAdapter::decodeInt32(int32_t& value)
76{
77    return m_decoder->decode(value);
78}
79
80bool DecoderAdapter::decodeInt64(int64_t& value)
81{
82    return m_decoder->decode(value);
83}
84
85bool DecoderAdapter::decodeFloat(float& value)
86{
87    return m_decoder->decode(value);
88}
89
90bool DecoderAdapter::decodeDouble(double& value)
91{
92    return m_decoder->decode(value);
93}
94
95bool DecoderAdapter::decodeString(String& value)
96{
97    // This mimics the CoreIPC binary encoding of Strings prior to r88886.
98    // Whenever the CoreIPC binary encoding changes, we'll have to "undo" the changes here.
99    // FIXME: We shouldn't use the CoreIPC binary encoding format for history,
100    // and we should come up with a migration strategy so we can actually bump the version number
101    // without breaking encoding/decoding of the history tree.
102
103    uint32_t length;
104    if (!m_decoder->decode(length))
105        return false;
106
107    if (length == std::numeric_limits<uint32_t>::max()) {
108        // This is the null string.
109        value = String();
110        return true;
111    }
112
113    uint64_t lengthInBytes;
114    if (!m_decoder->decode(lengthInBytes))
115        return false;
116
117    if (lengthInBytes % sizeof(UChar) || lengthInBytes / sizeof(UChar) != length) {
118        m_decoder->markInvalid();
119        return false;
120    }
121
122    if (!m_decoder->bufferIsLargeEnoughToContain<UChar>(length)) {
123        m_decoder->markInvalid();
124        return false;
125    }
126
127    UChar* buffer;
128    String string = String::createUninitialized(length, buffer);
129    if (!m_decoder->decodeFixedLengthData(reinterpret_cast<uint8_t*>(buffer), length * sizeof(UChar), __alignof(UChar)))
130        return false;
131
132    value = string;
133    return true;
134}
135
136}
137