mirror of
https://github.com/kwsch/PKHeX
synced 2024-12-23 10:53:10 +00:00
364 lines
12 KiB
C#
364 lines
12 KiB
C#
using System;
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using System.Collections.Generic;
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using static System.Buffers.Binary.BinaryPrimitives;
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namespace PKHeX.Core;
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/// <summary>
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/// Generation 4 <see cref="SaveFile"/> object for Pokémon Battle Revolution saves.
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/// </summary>
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public sealed class SAV4BR : SaveFile
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{
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protected internal override string ShortSummary => $"{Version} #{SaveCount:0000}";
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public override string Extension => string.Empty;
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public override PersonalTable4 Personal => PersonalTable.DP;
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public override ReadOnlySpan<ushort> HeldItems => Legal.HeldItems_DP;
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private const int SAVE_COUNT = 4;
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public const int SIZE_HALF = 0x1C0000;
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public SAV4BR() : base(SaveUtil.SIZE_G4BR)
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{
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ClearBoxes();
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}
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public SAV4BR(byte[] data) : base(data)
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{
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InitializeData(data);
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}
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private void InitializeData(ReadOnlySpan<byte> data)
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{
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Data = DecryptPBRSaveData(data);
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// Detect active save
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var first = ReadUInt32BigEndian(Data.AsSpan(0x00004C));
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var second = ReadUInt32BigEndian(Data.AsSpan(0x1C004C));
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SaveCount = Math.Max(second, first);
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if (second > first)
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{
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// swap halves
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byte[] tempData = new byte[SIZE_HALF];
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Array.Copy(Data, 0, tempData, 0, SIZE_HALF);
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Array.Copy(Data, SIZE_HALF, Data, 0, SIZE_HALF);
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tempData.CopyTo(Data, SIZE_HALF);
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}
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var names = (string[]) SaveNames;
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for (int i = 0; i < SAVE_COUNT; i++)
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{
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var name = GetOTName(i);
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if (string.IsNullOrWhiteSpace(name))
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name = $"Empty {i + 1}";
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else if (_currentSlot == -1)
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_currentSlot = i;
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names[i] = name;
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}
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if (_currentSlot == -1)
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_currentSlot = 0;
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CurrentSlot = _currentSlot;
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}
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/// <summary> Amount of times the primary save has been saved </summary>
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private uint SaveCount;
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protected override byte[] GetFinalData()
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{
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SetChecksums();
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return EncryptPBRSaveData(Data);
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}
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// Configuration
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protected override SAV4BR CloneInternal() => new(Write());
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public readonly IReadOnlyList<string> SaveNames = new string[SAVE_COUNT];
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private int _currentSlot = -1;
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private const int SIZE_SLOT = 0x6FF00;
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public int CurrentSlot
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{
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get => _currentSlot;
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// 4 save slots, data reading depends on current slot
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set
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{
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_currentSlot = value;
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var ofs = SIZE_SLOT * _currentSlot;
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Box = ofs + 0x978;
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Party = ofs + 0x13A54; // first team slot after boxes
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BoxName = ofs + 0x58674;
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}
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}
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protected override int SIZE_STORED => PokeCrypto.SIZE_4STORED;
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protected override int SIZE_PARTY => PokeCrypto.SIZE_4STORED + 4;
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public override BK4 BlankPKM => new();
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public override Type PKMType => typeof(BK4);
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public override ushort MaxMoveID => 467;
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public override ushort MaxSpeciesID => Legal.MaxSpeciesID_4;
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public override int MaxAbilityID => Legal.MaxAbilityID_4;
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public override int MaxItemID => Legal.MaxItemID_4_HGSS;
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public override int MaxBallID => Legal.MaxBallID_4;
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public override int MaxGameID => Legal.MaxGameID_4;
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public override int MaxEV => 255;
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public override int Generation => 4;
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public override EntityContext Context => EntityContext.Gen4;
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protected override int GiftCountMax => 1;
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public override int MaxStringLengthOT => 7;
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public override int MaxStringLengthNickname => 10;
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public override int MaxMoney => 999999;
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public override int Language => (int)LanguageID.English; // prevent KOR from inhabiting
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public override int BoxCount => 18;
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public override int PartyCount
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{
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get
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{
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int ctr = 0;
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for (int i = 0; i < 6; i++)
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{
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if (Data[GetPartyOffset(i) + 4] != 0) // sanity
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ctr++;
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}
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return ctr;
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}
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protected set
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{
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// Ignore, value is calculated
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}
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}
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// Checksums
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protected override void SetChecksums()
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{
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SetChecksum(Data, 0x0000000, 0x0000100, 0x000008);
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SetChecksum(Data, 0x0000000, SIZE_HALF, SIZE_HALF - 0x80);
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SetChecksum(Data, SIZE_HALF, 0x0000100, SIZE_HALF + 0x000008);
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SetChecksum(Data, SIZE_HALF, SIZE_HALF, SIZE_HALF + SIZE_HALF - 0x80);
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}
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public override bool ChecksumsValid => IsChecksumsValid(Data);
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public override string ChecksumInfo => $"Checksums valid: {ChecksumsValid}.";
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public static bool IsChecksumsValid(Span<byte> sav)
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{
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return VerifyChecksum(sav, 0x0000000, 0x0000100, 0x000008)
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&& VerifyChecksum(sav, 0x0000000, SIZE_HALF, SIZE_HALF - 0x80)
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&& VerifyChecksum(sav, SIZE_HALF, 0x0000100, SIZE_HALF + 0x000008)
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&& VerifyChecksum(sav, SIZE_HALF, SIZE_HALF, SIZE_HALF + SIZE_HALF - 0x80);
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}
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// Trainer Info
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public override GameVersion Version { get => GameVersion.BATREV; protected set { } }
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private string GetOTName(int slot)
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{
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var ofs = 0x390 + (0x6FF00 * slot);
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var span = Data.AsSpan(ofs, 16);
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return GetString(span);
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}
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private void SetOTName(int slot, ReadOnlySpan<char> name)
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{
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var ofs = 0x390 + (0x6FF00 * slot);
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var span = Data.AsSpan(ofs, 16);
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SetString(span, name, 7, StringConverterOption.ClearZero);
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}
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public string CurrentOT { get => GetOTName(_currentSlot); set => SetOTName(_currentSlot, value); }
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// Storage
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public override int GetPartyOffset(int slot) => Party + (SIZE_PARTY * slot);
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public override int GetBoxOffset(int box) => Box + (SIZE_STORED * box * 30);
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public override ushort TID16
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{
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get => (ushort)((Data[(_currentSlot * SIZE_SLOT) + 0x12867] << 8) | Data[(_currentSlot * SIZE_SLOT) + 0x12860]);
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set
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{
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Data[(_currentSlot * SIZE_SLOT) + 0x12867] = (byte)(value >> 8);
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Data[(_currentSlot * SIZE_SLOT) + 0x12860] = (byte)(value & 0xFF);
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}
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}
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public override ushort SID16
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{
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get => (ushort)((Data[(_currentSlot * SIZE_SLOT) + 0x12865] << 8) | Data[(_currentSlot * SIZE_SLOT) + 0x12866]);
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set
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{
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Data[(_currentSlot * SIZE_SLOT) + 0x12865] = (byte)(value >> 8);
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Data[(_currentSlot * SIZE_SLOT) + 0x12866] = (byte)(value & 0xFF);
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}
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}
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// Save file does not have Box Name / Wallpaper info
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private int BoxName = -1;
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private const int BoxNameLength = 0x28;
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private Span<byte> GetBoxNameSpan(int box)
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{
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int ofs = BoxName + (box * BoxNameLength);
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return Data.AsSpan(ofs, BoxNameLength);
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}
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public override string GetBoxName(int box)
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{
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if (BoxName < 0)
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return $"BOX {box + 1}";
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var span = GetBoxNameSpan(box);
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if (ReadUInt16BigEndian(span) == 0)
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return $"BOX {box + 1}";
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return GetString(span);
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}
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public override void SetBoxName(int box, ReadOnlySpan<char> value)
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{
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if (BoxName < 0)
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return;
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var span = GetBoxNameSpan(box);
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if (ReadUInt16BigEndian(span) == 0)
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return;
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SetString(span, value, BoxNameLength / 2, StringConverterOption.ClearZero);
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}
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protected override BK4 GetPKM(byte[] data)
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{
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if (data.Length != SIZE_STORED)
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Array.Resize(ref data, SIZE_STORED);
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return BK4.ReadUnshuffle(data);
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}
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protected override byte[] DecryptPKM(byte[] data) => data;
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protected override void SetDex(PKM pk) { /* There's no PokéDex */ }
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protected override void SetPKM(PKM pk, bool isParty = false)
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{
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var pk4 = (BK4)pk;
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// Apply to this Save File
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DateTime Date = DateTime.Now;
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if (pk4.Trade(OT, ID32, Gender, Date.Day, Date.Month, Date.Year))
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pk.RefreshChecksum();
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}
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protected override void SetPartyValues(PKM pk, bool isParty)
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{
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if (pk is G4PKM g4)
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g4.Sanity = isParty ? (ushort)0xC000 : (ushort)0x4000;
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}
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public static byte[] DecryptPBRSaveData(ReadOnlySpan<byte> input)
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{
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byte[] output = new byte[input.Length];
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Span<ushort> keys = stackalloc ushort[4];
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for (int offset = 0; offset < SaveUtil.SIZE_G4BR; offset += SIZE_HALF)
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{
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var inSlice = input.Slice(offset, SIZE_HALF);
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var outSlice = output.AsSpan(offset, SIZE_HALF);
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// First 8 bytes are the encryption keys for this chunk.
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var keySlice = inSlice[..(keys.Length * 2)];
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GeniusCrypto.ReadKeys(keySlice, keys);
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// Copy over the keys to the result.
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keySlice.CopyTo(outSlice);
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// Decrypt the input, result stored in output.
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Range r = new(8, SIZE_HALF);
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GeniusCrypto.Decrypt(inSlice[r], outSlice[r], keys);
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}
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return output;
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}
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private static byte[] EncryptPBRSaveData(ReadOnlySpan<byte> input)
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{
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byte[] output = new byte[input.Length];
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Span<ushort> keys = stackalloc ushort[4];
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for (int offset = 0; offset < SaveUtil.SIZE_G4BR; offset += SIZE_HALF)
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{
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var inSlice = input.Slice(offset, SIZE_HALF);
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var outSlice = output.AsSpan(offset, SIZE_HALF);
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// First 8 bytes are the encryption keys for this chunk.
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var keySlice = inSlice[..(keys.Length * 2)];
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GeniusCrypto.ReadKeys(keySlice, keys);
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// Copy over the keys to the result.
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keySlice.CopyTo(outSlice);
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// Decrypt the input, result stored in output.
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Range r = new(8, SIZE_HALF);
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GeniusCrypto.Encrypt(inSlice[r], outSlice[r], keys);
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}
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return output;
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}
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public static bool VerifyChecksum(Span<byte> input, int offset, int len, int chkOffset)
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{
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// Read original checksum data, and clear it for recomputing
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Span<uint> originalChecksums = stackalloc uint[16];
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var checkSpan = input.Slice(chkOffset, 4 * originalChecksums.Length);
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for (int i = 0; i < originalChecksums.Length; i++)
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{
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var chk = checkSpan.Slice(i * 4, 4);
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originalChecksums[i] = ReadUInt32BigEndian(chk);
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}
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checkSpan.Clear();
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// Compute current checksum of the specified span
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Span<uint> checksums = stackalloc uint[16];
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var span = input.Slice(offset, len);
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ComputeChecksums(span, checksums);
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// Restore original checksums
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WriteChecksums(checkSpan, originalChecksums);
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// Check if they match
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return checksums.SequenceEqual(originalChecksums);
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}
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private static void SetChecksum(Span<byte> input, int offset, int len, int chkOffset)
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{
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// Wipe Checksum region.
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var checkSpan = input.Slice(chkOffset, 4 * 16);
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checkSpan.Clear();
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// Compute current checksum of the specified span
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Span<uint> checksums = stackalloc uint[16];
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var span = input.Slice(offset, len);
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ComputeChecksums(span, checksums);
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WriteChecksums(checkSpan, checksums);
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}
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private static void WriteChecksums(Span<byte> span, Span<uint> checksums)
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{
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for (int i = 0; i < checksums.Length; i++)
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{
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var dest = span[(i * 4)..];
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WriteUInt32BigEndian(dest, checksums[i]);
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}
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}
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private static void ComputeChecksums(Span<byte> span, Span<uint> checksums)
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{
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for (int i = 0; i < span.Length; i += 2)
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{
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uint value = ReadUInt16BigEndian(span[i..]);
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for (int c = 0; c < checksums.Length; c++)
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checksums[c] += ((value >> c) & 1);
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}
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}
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public override string GetString(ReadOnlySpan<byte> data) => StringConverter4GC.GetStringUnicode(data);
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public override int SetString(Span<byte> destBuffer, ReadOnlySpan<char> value, int maxLength, StringConverterOption option) => StringConverter4GC.SetStringUnicode(value, destBuffer, maxLength, option);
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}
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