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PEImage.cs
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250 lines (229 loc) · 9.89 KB
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using BytecodeApi.Extensions;
namespace BytecodeApi.PEParser;
/// <summary>
/// Represents a PE (x86) or a PE+ (x64) image. This class parses binary files, typically EXE and DLL files.
/// </summary>
public class PEImage
{
/// <summary>
/// Gets the original PE image file, if this file was loaded from an existing source; otherwise, <see langword="null" />.
/// </summary>
public byte[] OriginalImage { get; }
/// <summary>
/// Gets the DOS header of this PE image file.
/// </summary>
public ImageDosHeader DosHeader { get; }
/// <summary>
/// Gets the MS-DOS stub of this PE image file.
/// </summary>
public byte[] DosStub { get; }
/// <summary>
/// Gets the COFF header of this PE image file.
/// </summary>
public ImageCoffHeader CoffHeader { get; }
/// <summary>
/// Gets the optional header of this PE image file.
/// </summary>
public ImageOptionalHeader OptionalHeader { get; }
/// <summary>
/// Gets the collection of section headers and data of this PE image file.
/// </summary>
public ImageSection[] Sections { get; }
private PEImage(byte[] originalImage)
{
OriginalImage = originalImage;
using BinaryReader reader = new(new MemoryStream(OriginalImage));
// MZ
if (reader.BaseStream.Length < 2) throw new PEImageParseException(0, "DOS signature not found.");
if (reader.ReadUInt16() != 0x5a4d) throw new PEImageParseException(0, "DOS header not found.");
// DOS Header
if (reader.BaseStream.Length - reader.BaseStream.Position < 64) throw new PEImageParseException((int)reader.BaseStream.Position, "DOS header incomplete.");
DosHeader = new()
{
LastPageSize = reader.ReadUInt16(),
PageCount = reader.ReadUInt16(),
RelocationCount = reader.ReadUInt16(),
HeaderSize = reader.ReadUInt16(),
MinAlloc = reader.ReadUInt16(),
MaxAlloc = reader.ReadUInt16(),
InitialSS = reader.ReadUInt16(),
InitialSP = reader.ReadUInt16(),
Checksum = reader.ReadUInt16(),
InitialIP = reader.ReadUInt16(),
InitialCS = reader.ReadUInt16(),
RelocationOffset = reader.ReadUInt16(),
OverlayNumber = reader.ReadUInt16(),
Reserved1 = reader.ReadUInt16(),
Reserved2 = reader.ReadUInt16(),
Reserved3 = reader.ReadUInt16(),
Reserved4 = reader.ReadUInt16(),
OemIdentifier = reader.ReadUInt16(),
OemInformation = reader.ReadUInt16(),
Reserved5 = reader.ReadUInt16(),
Reserved6 = reader.ReadUInt16(),
Reserved7 = reader.ReadUInt16(),
Reserved8 = reader.ReadUInt16(),
Reserved9 = reader.ReadUInt16(),
Reserved10 = reader.ReadUInt16(),
Reserved11 = reader.ReadUInt16(),
Reserved12 = reader.ReadUInt16(),
Reserved13 = reader.ReadUInt16(),
Reserved14 = reader.ReadUInt16(),
PEHeaderOffset = reader.ReadUInt32()
};
// DOS Stub
if (reader.BaseStream.Length < DosHeader.PEHeaderOffset) throw new PEImageParseException((int)reader.BaseStream.Position, "DOS stub incomplete.");
DosStub = reader.ReadBytes((int)(DosHeader.PEHeaderOffset - reader.BaseStream.Position));
// COFF Header
if (reader.ReadUInt32() != 0x4550) throw new PEImageParseException((int)reader.BaseStream.Position - 4, "COFF header not found.");
if (reader.BaseStream.Length - reader.BaseStream.Position < 20) throw new PEImageParseException((int)reader.BaseStream.Position, "COFF header incomplete.");
CoffHeader = new()
{
Machine = (ImageMachineType)reader.ReadUInt16(),
NumberOfSections = reader.ReadUInt16(),
TimeDateStamp = reader.ReadUInt32(),
PointerToSymbolTable = reader.ReadUInt32(),
NumberOfSymbols = reader.ReadUInt32(),
SizeOfOptionalHeader = reader.ReadUInt16(),
Characteristics = (ImageCharacteristics)reader.ReadUInt16()
};
// Optional Header
if (reader.BaseStream.Length - reader.BaseStream.Position < 2) throw new PEImageParseException((int)reader.BaseStream.Position, "Optional header not found.");
ushort magic = reader.ReadUInt16();
if (magic == 0x10b)
{
if (reader.BaseStream.Length - reader.BaseStream.Position < 94) throw new PEImageParseException((int)reader.BaseStream.Position, "Optional header incomplete.");
OptionalHeader = new ImageOptionalHeader32
{
MajorLinkerVersion = reader.ReadByte(),
MinorLinkerVersion = reader.ReadByte(),
SizeOfCode = reader.ReadUInt32(),
SizeOfInitializedData = reader.ReadUInt32(),
SizeOfUninitializedData = reader.ReadUInt32(),
AddressOfEntryPoint = reader.ReadUInt32(),
BaseOfCode = reader.ReadUInt32(),
BaseOfData = reader.ReadUInt32(),
ImageBase = reader.ReadUInt32(),
SectionAlignment = reader.ReadUInt32(),
FileAlignment = reader.ReadUInt32(),
MajorOperatingSystemVersion = reader.ReadUInt16(),
MinorOperatingSystemVersion = reader.ReadUInt16(),
MajorImageVersion = reader.ReadUInt16(),
MinorImageVersion = reader.ReadUInt16(),
MajorSubsystemVersion = reader.ReadUInt16(),
MinorSubsystemVersion = reader.ReadUInt16(),
Win32VersionValue = reader.ReadUInt32(),
SizeOfImage = reader.ReadUInt32(),
SizeOfHeaders = reader.ReadUInt32(),
Checksum = reader.ReadUInt32(),
Subsystem = (ImageSubsystem)reader.ReadUInt16(),
DllCharacteristics = (ImageDllCharacteristics)reader.ReadUInt16(),
SizeOfStackReserve = reader.ReadUInt32(),
SizeOfStackCommit = reader.ReadUInt32(),
SizeOfHeapReserve = reader.ReadUInt32(),
SizeOfHeapCommit = reader.ReadUInt32(),
LoaderFlags = reader.ReadUInt32(),
NumberOfRvaAndSizes = reader.ReadUInt32()
};
}
else if (magic == 0x20b)
{
if (reader.BaseStream.Length - reader.BaseStream.Position < 110) throw new PEImageParseException((int)reader.BaseStream.Position, "Optional header incomplete.");
OptionalHeader = new ImageOptionalHeader64
{
MajorLinkerVersion = reader.ReadByte(),
MinorLinkerVersion = reader.ReadByte(),
SizeOfCode = reader.ReadUInt32(),
SizeOfInitializedData = reader.ReadUInt32(),
SizeOfUninitializedData = reader.ReadUInt32(),
AddressOfEntryPoint = reader.ReadUInt32(),
BaseOfCode = reader.ReadUInt32(),
ImageBase = reader.ReadUInt64(),
SectionAlignment = reader.ReadUInt32(),
FileAlignment = reader.ReadUInt32(),
MajorOperatingSystemVersion = reader.ReadUInt16(),
MinorOperatingSystemVersion = reader.ReadUInt16(),
MajorImageVersion = reader.ReadUInt16(),
MinorImageVersion = reader.ReadUInt16(),
MajorSubsystemVersion = reader.ReadUInt16(),
MinorSubsystemVersion = reader.ReadUInt16(),
Win32VersionValue = reader.ReadUInt32(),
SizeOfImage = reader.ReadUInt32(),
SizeOfHeaders = reader.ReadUInt32(),
Checksum = reader.ReadUInt32(),
Subsystem = (ImageSubsystem)reader.ReadUInt16(),
DllCharacteristics = (ImageDllCharacteristics)reader.ReadUInt16(),
SizeOfStackReserve = reader.ReadUInt64(),
SizeOfStackCommit = reader.ReadUInt64(),
SizeOfHeapReserve = reader.ReadUInt64(),
SizeOfHeapCommit = reader.ReadUInt64(),
LoaderFlags = reader.ReadUInt32(),
NumberOfRvaAndSizes = reader.ReadUInt32()
};
}
else if (magic == 0x107)
{
throw new PEImageParseException((int)reader.BaseStream.Position - 2, "Optional header for ROM's is not supported.");
}
else
{
throw new PEImageParseException((int)reader.BaseStream.Position - 2, "Optional header magic value of '0x" + magic.ToString("x4") + "' unknown.");
}
// Data Directories
if (reader.BaseStream.Length - reader.BaseStream.Position < OptionalHeader.NumberOfRvaAndSizes * 8) throw new PEImageParseException((int)reader.BaseStream.Position, "Data directories incomplete.");
OptionalHeader.DataDirectories = Create.Array((int)OptionalHeader.NumberOfRvaAndSizes, i => new ImageDataDirectory((ImageDataDirectoryName)i, reader.ReadUInt32(), reader.ReadUInt32()));
// Section Headers
if (reader.BaseStream.Length - reader.BaseStream.Position < CoffHeader.NumberOfSections * 40) throw new PEImageParseException((int)reader.BaseStream.Position, "Section headers incomplete.");
Sections = Create
.Enumerable(CoffHeader.NumberOfSections, i => new ImageSectionHeader
{
Name = reader.ReadBytes(8).TakeWhile(c => c != 0).ToArray().ToUTF8String(),
VirtualSize = reader.ReadUInt32(),
VirtualAddress = reader.ReadUInt32(),
SizeOfRawData = reader.ReadUInt32(),
PointerToRawData = reader.ReadUInt32(),
PointerToRelocations = reader.ReadUInt32(),
PointerToLineNumbers = reader.ReadUInt32(),
NumberOfRelocations = reader.ReadUInt16(),
NumberOfLineNumbers = reader.ReadUInt16(),
Characteristics = (ImageSectionFlags)reader.ReadUInt32()
})
.Select(header =>
{
if (header.PointerToRawData + header.SizeOfRawData <= reader.BaseStream.Length)
{
return new ImageSection(header, OriginalImage.GetBytes((int)header.PointerToRawData, (int)header.SizeOfRawData));
}
else
{
throw new PEImageParseException((int)reader.BaseStream.Position, "Section '" + header.Name + "' incomplete.");
}
})
.ToArray();
}
/// <summary>
/// Creates a <see cref="PEImage" /> from the specified file with the specified form name.
/// </summary>
/// <param name="path">A <see cref="string" /> specifying the path of a file from which to create the <see cref="PEImage" />.</param>
/// <returns>
/// The <see cref="PEImage" /> this method creates.
/// </returns>
public static PEImage FromFile(string path)
{
Check.ArgumentNull(path);
Check.FileNotFound(path);
return new(File.ReadAllBytes(path));
}
/// <summary>
/// Creates a <see cref="PEImage" /> from the specified <see cref="byte" />[] that represents a PE image file.
/// </summary>
/// <param name="file">The <see cref="byte" />[] that represents a <see cref="PEImage" /> to parse.</param>
/// <returns>
/// The <see cref="PEImage" /> this method creates.
/// </returns>
public static PEImage FromBinary(byte[] file)
{
Check.ArgumentNull(file);
return new(file.ToArray());
}
}