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 "ImportedFunctionsEnumerator.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
35ImportedFunctionsEnumerator::ImportedFunctionsEnumerator(const PEImage& image, const IMAGE_THUNK_DATA* importNameTable, const IMAGE_THUNK_DATA* importAddressTable)
36    : m_image(image)
37    , m_nameTableEntry(importNameTable)
38    , m_addressTableEntry(importAddressTable)
39{
40    ASSERT(!importNameTable == !importAddressTable);
41}
42
43bool ImportedFunctionsEnumerator::isAtEnd() const
44{
45    ASSERT(!m_nameTableEntry || !m_nameTableEntry->u1.AddressOfData == !m_addressTableEntry->u1.Function);
46    return !m_nameTableEntry || !m_nameTableEntry->u1.AddressOfData;
47}
48
49void ImportedFunctionsEnumerator::next()
50{
51    ASSERT(!isAtEnd());
52    ++m_nameTableEntry;
53    ++m_addressTableEntry;
54}
55
56const char* ImportedFunctionsEnumerator::currentFunctionName() const
57{
58    ASSERT(m_nameTableEntry);
59
60    // Ordinal imports have no name.
61    if (IMAGE_SNAP_BY_ORDINAL(m_nameTableEntry->u1.Ordinal))
62        return 0;
63
64    const IMAGE_IMPORT_BY_NAME* importByName = static_cast<const IMAGE_IMPORT_BY_NAME*>(m_image.convertRVAToAddress(m_nameTableEntry->u1.AddressOfData));
65    return reinterpret_cast<const char*>(importByName->Name);
66}
67
68const void* const* ImportedFunctionsEnumerator::addressOfCurrentFunctionPointer() const
69{
70    ASSERT(m_addressTableEntry);
71    COMPILE_ASSERT(sizeof(void*) == sizeof(m_addressTableEntry->u1.Function), FunctionAddressSizeMatchesPointerSize);
72    return reinterpret_cast<const void* const*>(&m_addressTableEntry->u1.Function);
73}
74
75} // namespace WebCore
76