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 "PEImage.h"
28
29// See <http://msdn.microsoft.com/en-us/magazine/cc301808.aspx> and
30// <http://msdn.microsoft.com/en-us/windows/hardware/gg463119> for more information about the PE
31// image format.
32
33namespace WebCore {
34
35PEImage::PEImage(HMODULE module)
36    : m_module(module)
37    , m_ntHeaders(0)
38{
39    const IMAGE_DOS_HEADER* dosHeader = reinterpret_cast<const IMAGE_DOS_HEADER*>(m_module);
40    if (dosHeader->e_magic != IMAGE_DOS_SIGNATURE)
41        return;
42
43    const IMAGE_NT_HEADERS* ntHeaders = static_cast<const IMAGE_NT_HEADERS*>(convertRVAToAddress(dosHeader->e_lfanew));
44    if (ntHeaders->Signature != IMAGE_NT_SIGNATURE)
45        return;
46
47    if (ntHeaders->OptionalHeader.Magic != IMAGE_NT_OPTIONAL_HDR_MAGIC)
48        return;
49
50    m_ntHeaders = ntHeaders;
51}
52
53const void* PEImage::convertRVAToAddress(DWORD rva) const
54{
55    return reinterpret_cast<unsigned char*>(m_module) + rva;
56}
57
58const void* PEImage::dataDirectoryEntryAddress(DWORD entryIndex) const
59{
60    if (!isValid())
61        return 0;
62
63    if (m_ntHeaders->OptionalHeader.NumberOfRvaAndSizes <= entryIndex)
64        return 0;
65
66    const IMAGE_DATA_DIRECTORY& directory = m_ntHeaders->OptionalHeader.DataDirectory[entryIndex];
67
68    if (!directory.Size)
69        return 0;
70
71    return convertRVAToAddress(directory.VirtualAddress);
72}
73
74} // namespace WebCore
75