AdamuSw/src/Network/PacketTwister/PacketTwisterOfCashShop.cs

// <copyright file="PacketTwisterOfCashShop.cs" company="MUnique">
// Licensed under the MIT License. See LICENSE file in the project root for full license information.
// </copyright>

namespace MUnique.OpenMU.Network.PacketTwister;

/// <summary>
/// PacketTwister implementation for packets of 'CashShop' type.
/// </summary>
internal class PacketTwisterOfCashShop : IPacketTwister
{
    /// <inheritdoc/>
    public void Twist(Span<byte> data)
    {
        if (data.Length >= 4)
        {
            if (data.Length >= 8)
            {
                if (data.Length >= 16)
                {
                    if (data.Length >= 32)
                    {
                        data[21] ^= 0x1A;
                        var v17 = (byte)((data[13] >> 1) & 1);
                        if (((data[13] >> 7) & 1) != 0)
                        {
                            data[13] |= 2;
                        }
                        else
                        {
                            data[13] &= 0xFD;
                        }

                        if (v17 != 0)
                        {
                            data[13] |= 0x80;
                        }
                        else
                        {
                            data[13] &= 0x7F;
                        }

                        var v11 = data[4];
                        data[4] = data[13];
                        data[13] = v11;
                        var v16 = (byte)((data[27] >> 1) & 1);
                        if (((data[27] >> 4) & 1) != 0)
                        {
                            data[27] |= 2;
                        }
                        else
                        {
                            data[27] &= 0xFD;
                        }

                        if (v16 != 0)
                        {
                            data[27] |= 0x10;
                        }
                        else
                        {
                            data[27] &= 0xEF;
                        }

                        var v12 = data[28];
                        data[28] = data[6];
                        data[6] = v12;
                        var v13 = (byte)(data[27] >> 1);
                        data[27] <<= 7;
                        data[27] |= v13;
                        data[13] ^= 0x77;
                        var v14 = (byte)(data[29] >> 2);
                        data[29] <<= 6;
                        data[29] |= v14;
                        var v15 = (byte)((data[26] >> 2) & 1);
                        if (((data[26] >> 4) & 1) != 0)
                        {
                            data[26] |= 4;
                        }
                        else
                        {
                            data[26] &= 0xFB;
                        }

                        if (v15 != 0)
                        {
                            data[26] |= 0x10;
                        }
                        else
                        {
                            data[26] &= 0xEF;
                        }
                    }
                    else
                    {
                        var v8 = (byte)(data[1] >> 6);
                        data[1] *= 4;
                        data[1] |= v8;
                        data[13] ^= 0x5D;
                        var v9 = data[0];
                        data[0] = data[10];
                        data[10] = v9;
                        var v10 = (byte)(data[6] >> 7);
                        data[6] *= 2;
                        data[6] |= v10;
                    }
                }
                else
                {
                    var v5 = data[3];
                    data[3] = data[1];
                    data[1] = v5;
                    var v6 = (byte)(data[3] >> 3);
                    data[3] *= 32;
                    data[3] |= v6;
                    var v7 = data[6];
                    data[6] = data[7];
                    data[7] = v7;
                }
            }
            else
            {
                var v2 = (byte)((data[2] >> 4) & 1);
                if (((data[2] >> 1) & 1) != 0)
                {
                    data[2] |= 0x10;
                }
                else
                {
                    data[2] &= 0xEF;
                }

                if (v2 != 0)
                {
                    data[2] |= 2;
                }
                else
                {
                    data[2] &= 0xFD;
                }

                var v3 = (byte)(data[2] >> 6);
                data[2] *= 4;
                data[2] |= v3;
                data[1] ^= 0x9F;
                var v4 = (byte)(data[1] >> 1);
                data[1] <<= 7;
                data[1] |= v4;
            }
        }
    }

    /// <inheritdoc/>
    public void Correct(Span<byte> data)
    {
        if (data.Length >= 4)
        {
            if (data.Length >= 8)
            {
                if (data.Length >= 16)
                {
                    if (data.Length >= 32)
                    {
                        var v17 = (byte)((data[26] >> 2) & 1);
                        if (((data[26] >> 4) & 1) != 0)
                        {
                            data[26] |= 4;
                        }
                        else
                        {
                            data[26] &= 0xFB;
                        }

                        if (v17 != 0)
                        {
                            data[26] |= 0x10;
                        }
                        else
                        {
                            data[26] &= 0xEF;
                        }

                        var v11 = (byte)(data[29] >> 6);
                        data[29] *= 4;
                        data[29] |= v11;
                        data[13] ^= 0x77;
                        var v12 = (byte)(data[27] >> 7);
                        data[27] *= 2;
                        data[27] |= v12;
                        var v13 = data[28];
                        data[28] = data[6];
                        data[6] = v13;
                        var v16 = (byte)((data[27] >> 1) & 1);
                        if (((data[27] >> 4) & 1) != 0)
                        {
                            data[27] |= 2;
                        }
                        else
                        {
                            data[27] &= 0xFD;
                        }

                        if (v16 != 0)
                        {
                            data[27] |= 0x10;
                        }
                        else
                        {
                            data[27] &= 0xEF;
                        }

                        var v14 = data[4];
                        data[4] = data[13];
                        data[13] = v14;
                        var v15 = (byte)((data[13] >> 1) & 1);
                        if (((data[13] >> 7) & 1) != 0)
                        {
                            data[13] |= 2;
                        }
                        else
                        {
                            data[13] &= 0xFD;
                        }

                        if (v15 != 0)
                        {
                            data[13] |= 0x80;
                        }
                        else
                        {
                            data[13] &= 0x7F;
                        }

                        data[21] ^= 0x1A;
                    }
                    else
                    {
                        var v8 = (byte)(data[6] >> 1);
                        data[6] <<= 7;
                        data[6] |= v8;
                        var v9 = data[0];
                        data[0] = data[10];
                        data[10] = v9;
                        data[13] ^= 0x5D;
                        var v10 = (byte)(data[1] >> 2);
                        data[1] <<= 6;
                        data[1] |= v10;
                    }
                }
                else
                {
                    var v5 = data[6];
                    data[6] = data[7];
                    data[7] = v5;
                    var v6 = (byte)(data[3] >> 5);
                    data[3] *= 8;
                    data[3] |= v6;
                    var v7 = data[3];
                    data[3] = data[1];
                    data[1] = v7;
                }
            }
            else
            {
                var v3 = (byte)(data[1] >> 7);
                data[1] *= 2;
                data[1] |= v3;
                data[1] ^= 0x9F;
                var v4 = (byte)(data[2] >> 2);
                data[2] <<= 6;
                data[2] |= v4;
                var v2 = (byte)((data[2] >> 4) & 1);
                if (((data[2] >> 1) & 1) != 0)
                {
                    data[2] |= 0x10;
                }
                else
                {
                    data[2] &= 0xEF;
                }

                if (v2 != 0)
                {
                    data[2] |= 2;
                }
                else
                {
                    data[2] &= 0xFD;
                }
            }
        }
    }
}