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