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 "DelayLoadedModulesEnumerator.h"
28
29#include "ImportedFunctionsEnumerator.h"
30#include <delayimp.h>
31
32// See <http://msdn.microsoft.com/en-us/magazine/cc301808.aspx> and
33// <http://msdn.microsoft.com/en-us/windows/hardware/gg463119> for more information about the PE
34// image format.
35
36namespace WebCore {
37
38DelayLoadedModulesEnumerator::DelayLoadedModulesEnumerator(const PEImage& image)
39    : m_image(image)
40{
41    if (m_image.isValid())
42        m_descriptor = static_cast<const ImgDelayDescr*>(m_image.dataDirectoryEntryAddress(IMAGE_DIRECTORY_ENTRY_DELAY_IMPORT));
43    else
44        m_descriptor = 0;
45}
46
47bool DelayLoadedModulesEnumerator::isAtEnd() const
48{
49    return !m_descriptor || !m_descriptor->rvaHmod;
50}
51
52void DelayLoadedModulesEnumerator::next()
53{
54    ASSERT(!isAtEnd());
55    ++m_descriptor;
56}
57
58const char* DelayLoadedModulesEnumerator::currentModuleName() const
59{
60    ASSERT(!isAtEnd());
61    return static_cast<const char*>(convertPotentialRVAToAddress(m_descriptor->rvaDLLName));
62}
63
64ImportedFunctionsEnumerator DelayLoadedModulesEnumerator::functionsEnumerator() const
65{
66    ASSERT(!isAtEnd());
67
68    const IMAGE_THUNK_DATA* importNameTable = static_cast<const IMAGE_THUNK_DATA*>(convertPotentialRVAToAddress(m_descriptor->rvaINT));
69    const IMAGE_THUNK_DATA* importAddressTable = static_cast<const IMAGE_THUNK_DATA*>(convertPotentialRVAToAddress(m_descriptor->rvaIAT));
70
71    return ImportedFunctionsEnumerator(m_image, importNameTable, importAddressTable);
72}
73
74const void* DelayLoadedModulesEnumerator::convertPotentialRVAToAddress(DWORD potentialRVA) const
75{
76    ASSERT(!isAtEnd());
77
78    if (!(m_descriptor->grAttrs & dlattrRva)) {
79        // m_image is a pre-VC7.0 image, so addresses stored in the ImageDelayDescr are non-relative.
80        return reinterpret_cast<void*>(potentialRVA);
81    }
82
83    return m_image.convertRVAToAddress(potentialRVA);
84}
85
86} // namespace WebCore
87