mirror of
https://github.com/aaru-dps/Aaru.git
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488 lines
22 KiB
C#
488 lines
22 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : Marshal.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Helpers.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Provides marshalling for binary data.
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//
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// --[ License ] --------------------------------------------------------------
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//
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// This library is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; either version 2.1 of the
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// License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, see <http://www.gnu.org/licenses/>.
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//
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// ----------------------------------------------------------------------------
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// Copyright © 2011-2022 Natalia Portillo
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// ****************************************************************************/
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namespace Aaru.Helpers;
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using System;
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using System.Diagnostics.CodeAnalysis;
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using System.Reflection;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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/// <summary>Provides methods to marshal binary data into C# structs</summary>
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public static class Marshal
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{
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/// <summary>Returns the size of an unmanaged type in bytes.</summary>
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/// <typeparam name="T">The type whose size is to be returned.</typeparam>
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/// <returns>The size, in bytes, of the type that is specified by the <see cref="T" /> generic type parameter.</returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static int SizeOf<T>() => System.Runtime.InteropServices.Marshal.SizeOf<T>();
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/// <summary>Marshal little-endian binary data to a structure</summary>
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/// <param name="bytes">Byte array containing the binary data</param>
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/// <typeparam name="T">Type of the structure to marshal</typeparam>
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/// <returns>The binary data marshalled in a structure with the specified type</returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static T ByteArrayToStructureLittleEndian<T>(byte[] bytes) where T : struct
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{
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var ptr = GCHandle.Alloc(bytes, GCHandleType.Pinned);
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var str = (T)(System.Runtime.InteropServices.Marshal.PtrToStructure(ptr.AddrOfPinnedObject(), typeof(T)) ??
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default(T));
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ptr.Free();
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return str;
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}
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/// <summary>Marshal little-endian binary data to a structure</summary>
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/// <param name="bytes">Byte array containing the binary data</param>
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/// <param name="start">Start on the array where the structure begins</param>
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/// <param name="length">Length of the structure in bytes</param>
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/// <typeparam name="T">Type of the structure to marshal</typeparam>
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/// <returns>The binary data marshalled in a structure with the specified type</returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static T ByteArrayToStructureLittleEndian<T>(byte[] bytes, int start, int length) where T : struct
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{
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Span<byte> span = bytes;
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return ByteArrayToStructureLittleEndian<T>(span.Slice(start, length).ToArray());
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}
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/// <summary>Marshal big-endian binary data to a structure</summary>
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/// <param name="bytes">Byte array containing the binary data</param>
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/// <typeparam name="T">Type of the structure to marshal</typeparam>
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/// <returns>The binary data marshalled in a structure with the specified type</returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static T ByteArrayToStructureBigEndian<T>(byte[] bytes) where T : struct
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{
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var ptr = GCHandle.Alloc(bytes, GCHandleType.Pinned);
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object str = (T)(System.Runtime.InteropServices.Marshal.PtrToStructure(ptr.AddrOfPinnedObject(), typeof(T)) ??
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default(T));
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ptr.Free();
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return (T)SwapStructureMembersEndian(str);
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}
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/// <summary>Marshal big-endian binary data to a structure</summary>
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/// <param name="bytes">Byte array containing the binary data</param>
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/// <param name="start">Start on the array where the structure begins</param>
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/// <param name="length">Length of the structure in bytes</param>
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/// <typeparam name="T">Type of the structure to marshal</typeparam>
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/// <returns>The binary data marshalled in a structure with the specified type</returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static T ByteArrayToStructureBigEndian<T>(byte[] bytes, int start, int length) where T : struct
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{
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Span<byte> span = bytes;
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return ByteArrayToStructureBigEndian<T>(span.Slice(start, length).ToArray());
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}
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/// <summary>Marshal PDP-11 binary data to a structure</summary>
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/// <param name="bytes">Byte array containing the binary data</param>
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/// <typeparam name="T">Type of the structure to marshal</typeparam>
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/// <returns>The binary data marshalled in a structure with the specified type</returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static T ByteArrayToStructurePdpEndian<T>(byte[] bytes) where T : struct
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{
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{
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var ptr = GCHandle.Alloc(bytes, GCHandleType.Pinned);
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object str =
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(T)(System.Runtime.InteropServices.Marshal.PtrToStructure(ptr.AddrOfPinnedObject(), typeof(T)) ??
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default(T));
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ptr.Free();
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return (T)SwapStructureMembersEndianPdp(str);
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}
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}
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/// <summary>Marshal PDP-11 binary data to a structure</summary>
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/// <param name="bytes">Byte array containing the binary data</param>
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/// <param name="start">Start on the array where the structure begins</param>
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/// <param name="length">Length of the structure in bytes</param>
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/// <typeparam name="T">Type of the structure to marshal</typeparam>
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/// <returns>The binary data marshalled in a structure with the specified type</returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static T ByteArrayToStructurePdpEndian<T>(byte[] bytes, int start, int length) where T : struct
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{
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Span<byte> span = bytes;
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return ByteArrayToStructurePdpEndian<T>(span.Slice(start, length).ToArray());
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}
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/// <summary>
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/// Marshal little-endian binary data to a structure. If the structure type contains any non value type, this
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/// method will crash.
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/// </summary>
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/// <param name="bytes">Byte array containing the binary data</param>
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/// <typeparam name="T">Type of the structure to marshal</typeparam>
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/// <returns>The binary data marshalled in a structure with the specified type</returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static T SpanToStructureLittleEndian<T>(ReadOnlySpan<byte> bytes) where T : struct =>
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MemoryMarshal.Read<T>(bytes);
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/// <summary>
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/// Marshal little-endian binary data to a structure. If the structure type contains any non value type, this
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/// method will crash.
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/// </summary>
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/// <param name="bytes">Byte span containing the binary data</param>
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/// <param name="start">Start on the span where the structure begins</param>
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/// <param name="length">Length of the structure in bytes</param>
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/// <typeparam name="T">Type of the structure to marshal</typeparam>
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/// <returns>The binary data marshalled in a structure with the specified type</returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static T SpanToStructureLittleEndian<T>(ReadOnlySpan<byte> bytes, int start, int length) where T : struct =>
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MemoryMarshal.Read<T>(bytes.Slice(start, length));
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/// <summary>
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/// Marshal big-endian binary data to a structure. If the structure type contains any non value type, this method
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/// will crash.
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/// </summary>
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/// <param name="bytes">Byte array containing the binary data</param>
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/// <typeparam name="T">Type of the structure to marshal</typeparam>
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/// <returns>The binary data marshalled in a structure with the specified type</returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static T SpanToStructureBigEndian<T>(ReadOnlySpan<byte> bytes) where T : struct
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{
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T str = SpanToStructureLittleEndian<T>(bytes);
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return (T)SwapStructureMembersEndian(str);
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}
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/// <summary>
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/// Marshal big-endian binary data to a structure. If the structure type contains any non value type, this method
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/// will crash.
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/// </summary>
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/// <param name="bytes">Byte span containing the binary data</param>
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/// <param name="start">Start on the span where the structure begins</param>
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/// <param name="length">Length of the structure in bytes</param>
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/// <typeparam name="T">Type of the structure to marshal</typeparam>
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/// <returns>The binary data marshalled in a structure with the specified type</returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static T SpanToStructureBigEndian<T>(ReadOnlySpan<byte> bytes, int start, int length) where T : struct
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{
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T str = SpanToStructureLittleEndian<T>(bytes.Slice(start, length));
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return (T)SwapStructureMembersEndian(str);
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}
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/// <summary>
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/// Marshal PDP-11 binary data to a structure. If the structure type contains any non value type, this method will
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/// crash.
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/// </summary>
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/// <param name="bytes">Byte array containing the binary data</param>
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/// <typeparam name="T">Type of the structure to marshal</typeparam>
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/// <returns>The binary data marshalled in a structure with the specified type</returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static T SpanToStructurePdpEndian<T>(ReadOnlySpan<byte> bytes) where T : struct
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{
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object str = SpanToStructureLittleEndian<T>(bytes);
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return (T)SwapStructureMembersEndianPdp(str);
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}
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/// <summary>
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/// Marshal PDP-11 binary data to a structure. If the structure type contains any non value type, this method will
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/// crash.
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/// </summary>
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/// <param name="bytes">Byte array containing the binary data</param>
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/// <param name="start">Start on the span where the structure begins</param>
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/// <param name="length">Length of the structure in bytes</param>
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/// <typeparam name="T">Type of the structure to marshal</typeparam>
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/// <returns>The binary data marshalled in a structure with the specified type</returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static T SpanToStructurePdpEndian<T>(ReadOnlySpan<byte> bytes, int start, int length) where T : struct
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{
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object str = SpanToStructureLittleEndian<T>(bytes.Slice(start, length));
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return (T)SwapStructureMembersEndianPdp(str);
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}
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/// <summary>
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/// Marshal a structure depending on the decoration of <see cref="MarshallingPropertiesAttribute" />. If the
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/// decoration is not present it will marshal as a reference type containing little endian structure.
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/// </summary>
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/// <param name="bytes">Byte array containing the binary data</param>
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/// <typeparam name="T">Type of the structure to marshal</typeparam>
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/// <returns>The binary data marshalled in a structure with the specified type</returns>
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/// <exception cref="ArgumentOutOfRangeException">
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/// The <see cref="MarshallingPropertiesAttribute" /> contains an unsupported
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/// endian
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/// </exception>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static T MarshalStructure<T>(byte[] bytes) where T : struct
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{
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if(typeof(T).GetCustomAttribute(typeof(MarshallingPropertiesAttribute)) is not MarshallingPropertiesAttribute
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properties)
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return ByteArrayToStructureLittleEndian<T>(bytes);
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return properties.Endian switch
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{
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BitEndian.Little => properties.HasReferences ? ByteArrayToStructureLittleEndian<T>(bytes)
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: SpanToStructureLittleEndian<T>(bytes),
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BitEndian.Big => properties.HasReferences ? ByteArrayToStructureBigEndian<T>(bytes)
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: SpanToStructureBigEndian<T>(bytes),
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BitEndian.Pdp => properties.HasReferences ? ByteArrayToStructurePdpEndian<T>(bytes)
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: SpanToStructurePdpEndian<T>(bytes),
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_ => throw new ArgumentOutOfRangeException()
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};
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}
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/// <summary>Swaps all members of a structure</summary>
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/// <param name="str"></param>
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/// <returns></returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining), SuppressMessage("ReSharper", "InconsistentNaming")]
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public static object SwapStructureMembersEndian(object str)
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{
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Type t = str.GetType();
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FieldInfo[] fieldInfo = t.GetFields();
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foreach(FieldInfo fi in fieldInfo)
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if(fi.FieldType == typeof(short) ||
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fi.FieldType.IsEnum && fi.FieldType.GetEnumUnderlyingType() == typeof(short))
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{
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var x = (short)(fi.GetValue(str) ?? default(short));
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fi.SetValue(str, (short)((x << 8) | ((x >> 8) & 0xFF)));
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}
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else if(fi.FieldType == typeof(int) ||
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fi.FieldType.IsEnum && fi.FieldType.GetEnumUnderlyingType() == typeof(int))
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{
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var x = (int)(fi.GetValue(str) ?? default(int));
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x = (int)(((x << 8) & 0xFF00FF00) | (((uint)x >> 8) & 0xFF00FF));
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fi.SetValue(str, (int)(((uint)x << 16) | (((uint)x >> 16) & 0xFFFF)));
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}
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else if(fi.FieldType == typeof(long) ||
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fi.FieldType.IsEnum && fi.FieldType.GetEnumUnderlyingType() == typeof(long))
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{
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var x = (long)(fi.GetValue(str) ?? default(long));
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x = ((x & 0x00000000FFFFFFFF) << 32) | (long)(((ulong)x & 0xFFFFFFFF00000000) >> 32);
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x = ((x & 0x0000FFFF0000FFFF) << 16) | (long)(((ulong)x & 0xFFFF0000FFFF0000) >> 16);
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x = ((x & 0x00FF00FF00FF00FF) << 8) | (long)(((ulong)x & 0xFF00FF00FF00FF00) >> 8);
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fi.SetValue(str, x);
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}
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else if(fi.FieldType == typeof(ushort) ||
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fi.FieldType.IsEnum && fi.FieldType.GetEnumUnderlyingType() == typeof(ushort))
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{
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var x = (ushort)(fi.GetValue(str) ?? default(ushort));
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fi.SetValue(str, (ushort)((x << 8) | (x >> 8)));
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}
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else if(fi.FieldType == typeof(uint) ||
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fi.FieldType.IsEnum && fi.FieldType.GetEnumUnderlyingType() == typeof(uint))
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{
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var x = (uint)(fi.GetValue(str) ?? default(uint));
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x = ((x << 8) & 0xFF00FF00) | ((x >> 8) & 0xFF00FF);
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fi.SetValue(str, (x << 16) | (x >> 16));
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}
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else if(fi.FieldType == typeof(ulong) ||
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fi.FieldType.IsEnum && fi.FieldType.GetEnumUnderlyingType() == typeof(ulong))
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{
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var x = (ulong)(fi.GetValue(str) ?? default(ulong));
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x = ((x & 0x00000000FFFFFFFF) << 32) | ((x & 0xFFFFFFFF00000000) >> 32);
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x = ((x & 0x0000FFFF0000FFFF) << 16) | ((x & 0xFFFF0000FFFF0000) >> 16);
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x = ((x & 0x00FF00FF00FF00FF) << 8) | ((x & 0xFF00FF00FF00FF00) >> 8);
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fi.SetValue(str, x);
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}
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else if(fi.FieldType == typeof(float))
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{
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var flt = (float)(fi.GetValue(str) ?? default(float));
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byte[] flt_b = BitConverter.GetBytes(flt);
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fi.SetValue(str, BitConverter.ToSingle(new[]
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{
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flt_b[3], flt_b[2], flt_b[1], flt_b[0]
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}, 0));
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}
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else if(fi.FieldType == typeof(double))
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{
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var dbl = (double)(fi.GetValue(str) ?? default(double));
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byte[] dbl_b = BitConverter.GetBytes(dbl);
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fi.SetValue(str, BitConverter.ToDouble(new[]
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{
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dbl_b[7], dbl_b[6], dbl_b[5], dbl_b[4], dbl_b[3], dbl_b[2], dbl_b[1], dbl_b[0]
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}, 0));
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}
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else if(fi.FieldType == typeof(byte) ||
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fi.FieldType == typeof(sbyte))
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{
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// Do nothing, can't byteswap them!
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}
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else if(fi.FieldType == typeof(Guid))
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{
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// TODO: Swap GUID
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}
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// TODO: Swap arrays
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else if(fi.FieldType.IsValueType &&
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!fi.FieldType.IsEnum &&
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!fi.FieldType.IsArray)
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{
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object obj = fi.GetValue(str);
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object strc = SwapStructureMembersEndian(obj);
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fi.SetValue(str, strc);
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}
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return str;
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}
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/// <summary>Swaps all fields in an structure considering them to follow PDP endian conventions</summary>
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/// <param name="str">Source structure</param>
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/// <returns>Resulting structure</returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static object SwapStructureMembersEndianPdp(object str)
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{
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Type t = str.GetType();
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FieldInfo[] fieldInfo = t.GetFields();
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foreach(FieldInfo fi in fieldInfo)
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if(fi.FieldType == typeof(short) ||
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fi.FieldType == typeof(long) ||
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fi.FieldType == typeof(ushort) ||
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fi.FieldType == typeof(ulong) ||
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fi.FieldType == typeof(float) ||
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fi.FieldType == typeof(double) ||
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fi.FieldType == typeof(byte) ||
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fi.FieldType == typeof(sbyte) ||
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fi.FieldType == typeof(Guid))
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{
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// Do nothing
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}
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else if(fi.FieldType == typeof(int) ||
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fi.FieldType.IsEnum && fi.FieldType.GetEnumUnderlyingType() == typeof(int))
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{
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var x = (int)(fi.GetValue(str) ?? default(int));
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fi.SetValue(str, ((x & 0xffffu) << 16) | ((x & 0xffff0000u) >> 16));
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}
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else if(fi.FieldType == typeof(uint) ||
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fi.FieldType.IsEnum && fi.FieldType.GetEnumUnderlyingType() == typeof(uint))
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{
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var x = (uint)(fi.GetValue(str) ?? default(uint));
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fi.SetValue(str, ((x & 0xffffu) << 16) | ((x & 0xffff0000u) >> 16));
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}
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// TODO: Swap arrays
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else if(fi.FieldType.IsValueType &&
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!fi.FieldType.IsEnum &&
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!fi.FieldType.IsArray)
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{
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object obj = fi.GetValue(str);
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object strc = SwapStructureMembersEndianPdp(obj);
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fi.SetValue(str, strc);
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}
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return str;
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}
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/// <summary>Marshal a structure to little-endian binary data</summary>
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/// <param name="str">The structure you want to marshal to binary</param>
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/// <typeparam name="T">Type of the structure to marshal</typeparam>
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/// <returns>The byte array representing the given structure</returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static byte[] StructureToByteArrayLittleEndian<T>(T str) where T : struct
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{
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var buf = new byte[SizeOf<T>()];
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var ptr = GCHandle.Alloc(buf, GCHandleType.Pinned);
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System.Runtime.InteropServices.Marshal.StructureToPtr(str, ptr.AddrOfPinnedObject(), false);
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ptr.Free();
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return buf;
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}
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/// <summary>Marshal a structure to little-endian binary data</summary>
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/// <param name="str">The structure you want to marshal to binary</param>
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/// <typeparam name="T">Type of the structure to marshal</typeparam>
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/// <returns>The byte array representing the given structure</returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static byte[] StructureToByteArrayBigEndian<T>(T str) where T : struct =>
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StructureToByteArrayLittleEndian((T)SwapStructureMembersEndian(str));
|
|
|
|
/// <summary>Converts a hexadecimal string into a byte array</summary>
|
|
/// <param name="hex">Hexadecimal string</param>
|
|
/// <param name="outBuf">Resulting byte array</param>
|
|
/// <returns>Number of output bytes processed</returns>
|
|
public static int ConvertFromHexAscii(string hex, out byte[] outBuf)
|
|
{
|
|
outBuf = null;
|
|
|
|
if(hex is null or "")
|
|
return -1;
|
|
|
|
var off = 0;
|
|
|
|
if(hex[0] == '0' &&
|
|
(hex[1] == 'x' || hex[1] == 'X'))
|
|
off = 2;
|
|
|
|
outBuf = new byte[(hex.Length - off) / 2];
|
|
var count = 0;
|
|
|
|
for(int i = off; i < hex.Length; i += 2)
|
|
{
|
|
char c = hex[i];
|
|
|
|
if(c is < '0' or > '9' and < 'A' or > 'F' and < 'a' or > 'f')
|
|
break;
|
|
|
|
c -= c switch
|
|
{
|
|
>= 'a' and <= 'f' => '\u0057',
|
|
>= 'A' and <= 'F' => '\u0037',
|
|
_ => '\u0030'
|
|
};
|
|
|
|
outBuf[(i - off) / 2] = (byte)(c << 4);
|
|
|
|
c = hex[i + 1];
|
|
|
|
if(c is < '0' or > '9' and < 'A' or > 'F' and < 'a' or > 'f')
|
|
break;
|
|
|
|
c -= c switch
|
|
{
|
|
>= 'a' and <= 'f' => '\u0057',
|
|
>= 'A' and <= 'F' => '\u0037',
|
|
_ => '\u0030'
|
|
};
|
|
|
|
outBuf[(i - off) / 2] += (byte)c;
|
|
|
|
count++;
|
|
}
|
|
|
|
return count;
|
|
}
|
|
} |