mirror of
https://github.com/crskycode/GARbro.git
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271 lines
10 KiB
C#
271 lines
10 KiB
C#
//! \file ExeFile.cs
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//! \date Mon Jan 23 05:12:50 2017
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//! \brief Win32 EXE file parser/accessor.
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//
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// Copyright (C) 2017 by morkt
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Runtime.InteropServices;
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using System.Text;
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using GameRes.Utility;
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namespace GameRes.Formats
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{
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public class ExeFile
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{
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ArcView m_file;
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Dictionary<string, Section> m_section_table;
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Section m_overlay;
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public ExeFile (ArcView file)
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{
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if (!file.View.AsciiEqual (0, "MZ"))
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throw new InvalidFormatException ("File is not a valid win32 executable.");
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m_file = file;
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Whole = new Section { Offset = 0, Size = (uint)Math.Min (m_file.MaxOffset, uint.MaxValue) };
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}
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public ArcView.Frame View { get { return m_file.View; } }
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/// <summary>
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/// Section representing the whole file.
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/// </summary>
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public Section Whole { get; private set; }
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/// <summary>
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/// Dictionary of executable file sections.
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/// </summary>
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public IReadOnlyDictionary<string, Section> Sections
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{
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get
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{
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if (null == m_section_table)
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InitSectionTable();
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return m_section_table;
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}
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}
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/// <summary>
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/// Overlay section of executable file.
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/// </summary>
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public Section Overlay
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{
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get
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{
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if (null == m_section_table)
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InitSectionTable();
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return m_overlay;
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}
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}
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/// <summary>
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/// Structure representing section of executable file in the form of its offset and size.
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/// </summary>
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public struct Section
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{
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public long Offset;
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public uint Size;
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}
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/// <summary>
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/// Returns true if executable file contains section <paramref name="name"/>.
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/// </summary>
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public bool ContainsSection (string name)
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{
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return Sections.ContainsKey (name);
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}
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/// <summary>
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/// Search for byte sequence within specified section.
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/// </summary>
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/// <returns>Offset of byte sequence, if found, -1 otherwise.</returns>
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public long FindString (Section section, byte[] seq, int step = 1)
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{
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if (step <= 0)
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throw new ArgumentOutOfRangeException ("step", "Search step should be positive integer.");
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long offset = section.Offset;
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if (offset < 0 || offset > m_file.MaxOffset)
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throw new ArgumentOutOfRangeException ("section", "Invalid executable file section specified.");
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uint seq_length = (uint)seq.Length;
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if (0 == seq_length || section.Size < seq_length)
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return -1;
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long end_offset = Math.Min (m_file.MaxOffset, offset + section.Size);
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unsafe
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{
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while (offset < end_offset)
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{
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uint page_size = (uint)Math.Min (0x10000L, end_offset - offset);
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if (page_size < seq_length)
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break;
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using (var view = m_file.CreateViewAccessor (offset, page_size))
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using (var ptr = new ViewPointer (view, offset))
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{
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byte* page_begin = ptr.Value;
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byte* page_end = page_begin + page_size - seq_length;
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byte* p;
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for (p = page_begin; p <= page_end; p += step)
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{
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int i = 0;
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while (p[i] == seq[i])
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{
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if (++i == seq.Length)
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return offset + (p - page_begin);
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}
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}
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offset += p - page_begin;
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}
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}
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}
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return -1;
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}
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public long FindAsciiString (Section section, string seq, int step = 1)
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{
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return FindString (section, Encoding.ASCII.GetBytes (seq), step);
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}
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public long FindSignature (Section section, uint signature, int step = 4)
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{
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var bytes = new byte[4];
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LittleEndian.Pack (signature, bytes, 0);
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return FindString (section, bytes, step);
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}
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private void InitSectionTable ()
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{
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long pe_offset = m_file.View.ReadUInt32 (0x3C);
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if (pe_offset >= m_file.MaxOffset-0x58 || !m_file.View.AsciiEqual (pe_offset, "PE\0\0"))
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throw new InvalidFormatException ("File is not a valid win32 executable.");
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int opt_header = m_file.View.ReadUInt16 (pe_offset+0x14); // SizeOfOptionalHeader
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long offset = m_file.View.ReadUInt32 (pe_offset+0x54); // SizeOfHeaders
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long section_table = pe_offset+opt_header+0x18;
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int count = m_file.View.ReadUInt16 (pe_offset+6); // NumberOfSections
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var table = new Dictionary<string, Section> (count);
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if (section_table + 0x28*count < m_file.MaxOffset)
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{
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for (int i = 0; i < count; ++i)
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{
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var name = m_file.View.ReadString (section_table, 0x10);
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var section = new Section {
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Size = m_file.View.ReadUInt32 (section_table+0x10),
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Offset = m_file.View.ReadUInt32 (section_table+0x14)
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};
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if (!table.ContainsKey (name))
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table.Add (name, section);
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if (0 != section.Size)
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offset = Math.Max (section.Offset + section.Size, offset);
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section_table += 0x28;
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}
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}
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offset = Math.Min ((offset + 0xF) & ~0xFL, m_file.MaxOffset);
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m_overlay.Offset = offset;
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m_overlay.Size = (uint)(m_file.MaxOffset - offset);
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m_section_table = table;
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}
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/// <summary>
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/// Helper class for executable file resources access.
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/// </summary>
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public sealed class ResourceAccessor : IDisposable
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{
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IntPtr m_exe;
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public ResourceAccessor (string filename)
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{
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const uint LOAD_LIBRARY_AS_IMAGE_RESOURCE = 0x20;
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m_exe = NativeMethods.LoadLibraryEx (filename, IntPtr.Zero, LOAD_LIBRARY_AS_IMAGE_RESOURCE);
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if (IntPtr.Zero == m_exe)
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throw new Win32Exception (Marshal.GetLastWin32Error());
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}
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public byte[] GetResource (string name, string type)
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{
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if (m_disposed)
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throw new ObjectDisposedException ("Access to disposed ResourceAccessor object failed.");
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var res = NativeMethods.FindResource (m_exe, name, type);
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if (IntPtr.Zero == res)
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return null;
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var glob = NativeMethods.LoadResource (m_exe, res);
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if (IntPtr.Zero == glob)
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return null;
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uint size = NativeMethods.SizeofResource (m_exe, res);
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var src = NativeMethods.LockResource (glob);
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if (IntPtr.Zero == src)
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return null;
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var dst = new byte[size];
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Marshal.Copy (src, dst, 0, dst.Length);
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return dst;
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}
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#region IDisposable implementation
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bool m_disposed = false;
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public void Dispose ()
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{
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Dispose (true);
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GC.SuppressFinalize (this);
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}
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~ResourceAccessor ()
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{
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Dispose (false);
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}
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void Dispose (bool disposing)
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{
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if (!m_disposed)
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{
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NativeMethods.FreeLibrary (m_exe);
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m_disposed = true;
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}
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}
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#endregion
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}
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}
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static internal class NativeMethods
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{
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[DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
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static internal extern IntPtr LoadLibraryEx (string lpFileName, IntPtr hReservedNull, uint dwFlags);
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[DllImport("kernel32.dll", SetLastError = true)]
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[return: MarshalAs(UnmanagedType.Bool)]
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static internal extern bool FreeLibrary (IntPtr hModule);
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[DllImport( "kernel32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
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static internal extern IntPtr FindResource (IntPtr hModule, string lpName, string lpType);
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[DllImport("Kernel32.dll", SetLastError = true)]
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static internal extern IntPtr LoadResource (IntPtr hModule, IntPtr hResource);
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[DllImport("Kernel32.dll", SetLastError = true)]
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static internal extern uint SizeofResource (IntPtr hModule, IntPtr hResource);
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[DllImport("kernel32.dll")]
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static internal extern IntPtr LockResource (IntPtr hResData);
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}
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}
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