source: stable/HeuristicLab.ExtLibs/HeuristicLab.Cecil/0.9.5/Mono.Cecil-0.9.5/Mono.Cecil/Mono.Cecil.PE/Image.cs

//
// Image.cs
//
// Author:
//   Jb Evain (jbevain@gmail.com)
//
// Copyright (c) 2008 - 2011 Jb Evain
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;

using Mono;
using Mono.Cecil.Cil;
using Mono.Cecil.Metadata;

using RVA = System.UInt32;

namespace Mono.Cecil.PE {

  sealed class Image {

    public ModuleKind Kind;
    public TargetRuntime Runtime;
    public TargetArchitecture Architecture;
    public string FileName;

    public Section [] Sections;

    public Section MetadataSection;

    public uint EntryPointToken;
    public ModuleAttributes Attributes;

    public DataDirectory Debug;
    public DataDirectory Resources;

    public StringHeap StringHeap;
    public BlobHeap BlobHeap;
    public UserStringHeap UserStringHeap;
    public GuidHeap GuidHeap;
    public TableHeap TableHeap;

    readonly int [] coded_index_sizes = new int [13];

    readonly Func<Table, int> counter;

    public Image ()
    {
      counter = GetTableLength;
    }

    public bool HasTable (Table table)
    {
      return GetTableLength (table) > 0;
    }

    public int GetTableLength (Table table)
    {
      return (int) TableHeap [table].Length;
    }

    public int GetTableIndexSize (Table table)
    {
      return GetTableLength (table) < 65536 ? 2 : 4;
    }

    public int GetCodedIndexSize (CodedIndex coded_index)
    {
      var index = (int) coded_index;
      var size = coded_index_sizes [index];
      if (size != 0)
        return size;

      return coded_index_sizes [index] = coded_index.GetSize (counter);
    }

    public uint ResolveVirtualAddress (RVA rva)
    {
      var section = GetSectionAtVirtualAddress (rva);
      if (section == null)
        throw new ArgumentOutOfRangeException ();

      return ResolveVirtualAddressInSection (rva, section);
    }

    public uint ResolveVirtualAddressInSection (RVA rva, Section section)
    {
      return rva + section.PointerToRawData - section.VirtualAddress;
    }

    public Section GetSection (string name)
    {
      var sections = this.Sections;
      for (int i = 0; i < sections.Length; i++) {
        var section = sections [i];
        if (section.Name == name)
          return section;
      }

      return null;
    }

    public Section GetSectionAtVirtualAddress (RVA rva)
    {
      var sections = this.Sections;
      for (int i = 0; i < sections.Length; i++) {
        var section = sections [i];
        if (rva >= section.VirtualAddress && rva < section.VirtualAddress + section.SizeOfRawData)
          return section;
      }

      return null;
    }

    public ImageDebugDirectory GetDebugHeader (out byte [] header)
    {
      var section = GetSectionAtVirtualAddress (Debug.VirtualAddress);
      var buffer = new ByteBuffer (section.Data);
      buffer.position = (int) (Debug.VirtualAddress - section.VirtualAddress);

      var directory = new ImageDebugDirectory {
        Characteristics = buffer.ReadInt32 (),
        TimeDateStamp = buffer.ReadInt32 (),
        MajorVersion = buffer.ReadInt16 (),
        MinorVersion = buffer.ReadInt16 (),
        Type = buffer.ReadInt32 (),
        SizeOfData = buffer.ReadInt32 (),
        AddressOfRawData = buffer.ReadInt32 (),
        PointerToRawData = buffer.ReadInt32 (),
      };

      buffer.position = (int) (directory.PointerToRawData - section.PointerToRawData);

      header = new byte [directory.SizeOfData];
      Buffer.BlockCopy (buffer.buffer, buffer.position, header, 0, header.Length);

      return directory;
    }
  }
}