PEHeaderBuilder.cs

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using System.Reflection.Internal;
 
namespace System.Reflection.PortableExecutable;
 
public sealed class PEHeaderBuilder
{
    public Machine Machine { get; }
 
    public Characteristics ImageCharacteristics { get; }
 
    public byte MajorLinkerVersion { get; }
 
    public byte MinorLinkerVersion { get; }
 
    public ulong ImageBase { get; }
 
    public int SectionAlignment { get; }
 
    public int FileAlignment { get; }
 
    public ushort MajorOperatingSystemVersion { get; }
 
    public ushort MinorOperatingSystemVersion { get; }
 
    public ushort MajorImageVersion { get; }
 
    public ushort MinorImageVersion { get; }
 
    public ushort MajorSubsystemVersion { get; }
 
    public ushort MinorSubsystemVersion { get; }
 
    public Subsystem Subsystem { get; }
 
    public DllCharacteristics DllCharacteristics { get; }
 
    public ulong SizeOfStackReserve { get; }
 
    public ulong SizeOfStackCommit { get; }
 
    public ulong SizeOfHeapReserve { get; }
 
    public ulong SizeOfHeapCommit { get; }
 
    internal bool Is32Bit
    {
        get
        {
            if (Machine != Machine.Amd64 && Machine != Machine.IA64)
            {
                return Machine != Machine.Arm64;
            }
            return false;
        }
    }
 
    public PEHeaderBuilder(Machine machine = Machine.Unknown, int sectionAlignment = 8192, int fileAlignment = 512, ulong imageBase = 4194304uL, byte majorLinkerVersion = 48, byte minorLinkerVersion = 0, ushort majorOperatingSystemVersion = 4, ushort minorOperatingSystemVersion = 0, ushort majorImageVersion = 0, ushort minorImageVersion = 0, ushort majorSubsystemVersion = 4, ushort minorSubsystemVersion = 0, Subsystem subsystem = Subsystem.WindowsCui, DllCharacteristics dllCharacteristics = DllCharacteristics.DynamicBase | DllCharacteristics.NxCompatible | DllCharacteristics.NoSeh | DllCharacteristics.TerminalServerAware, Characteristics imageCharacteristics = Characteristics.Dll, ulong sizeOfStackReserve = 1048576uL, ulong sizeOfStackCommit = 4096uL, ulong sizeOfHeapReserve = 1048576uL, ulong sizeOfHeapCommit = 4096uL)
    {
        if (fileAlignment < 512 || fileAlignment > 65536 || BitArithmetic.CountBits(fileAlignment) != 1)
        {
            Throw.ArgumentOutOfRange("fileAlignment");
        }
        if (sectionAlignment < fileAlignment || BitArithmetic.CountBits(sectionAlignment) != 1)
        {
            Throw.ArgumentOutOfRange("sectionAlignment");
        }
        Machine = machine;
        SectionAlignment = sectionAlignment;
        FileAlignment = fileAlignment;
        ImageBase = imageBase;
        MajorLinkerVersion = majorLinkerVersion;
        MinorLinkerVersion = minorLinkerVersion;
        MajorOperatingSystemVersion = majorOperatingSystemVersion;
        MinorOperatingSystemVersion = minorOperatingSystemVersion;
        MajorImageVersion = majorImageVersion;
        MinorImageVersion = minorImageVersion;
        MajorSubsystemVersion = majorSubsystemVersion;
        MinorSubsystemVersion = minorSubsystemVersion;
        Subsystem = subsystem;
        DllCharacteristics = dllCharacteristics;
        ImageCharacteristics = imageCharacteristics;
        SizeOfStackReserve = sizeOfStackReserve;
        SizeOfStackCommit = sizeOfStackCommit;
        SizeOfHeapReserve = sizeOfHeapReserve;
        SizeOfHeapCommit = sizeOfHeapCommit;
    }
 
    public static PEHeaderBuilder CreateExecutableHeader()
    {
        return new PEHeaderBuilder(Machine.Unknown, 8192, 512, 4194304uL, 48, 0, 4, 0, 0, 0, 4, 0, Subsystem.WindowsCui, DllCharacteristics.DynamicBase | DllCharacteristics.NxCompatible | DllCharacteristics.NoSeh | DllCharacteristics.TerminalServerAware, Characteristics.ExecutableImage, 1048576uL, 4096uL, 1048576uL, 4096uL);
    }
 
    public static PEHeaderBuilder CreateLibraryHeader()
    {
        return new PEHeaderBuilder(Machine.Unknown, 8192, 512, 4194304uL, 48, 0, 4, 0, 0, 0, 4, 0, Subsystem.WindowsCui, DllCharacteristics.DynamicBase | DllCharacteristics.NxCompatible | DllCharacteristics.NoSeh | DllCharacteristics.TerminalServerAware, Characteristics.ExecutableImage | Characteristics.Dll, 1048576uL, 4096uL, 1048576uL, 4096uL);
    }
 
    internal int ComputeSizeOfPEHeaders(int sectionCount)
    {
        return PEBuilder.DosHeaderSize + 4 + 20 + PEHeader.Size(Is32Bit) + 40 * sectionCount;
    }
}