mirror of
https://github.com/kwsch/PKHeX
synced 2024-12-20 01:13:17 +00:00
413 lines
15 KiB
C#
413 lines
15 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Security.Cryptography;
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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 3 <see cref="SaveFile"/> object for Pokémon Colosseum saves.
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/// </summary>
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public sealed class SAV3Colosseum : SaveFile, IGCSaveFile
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{
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protected internal override string ShortSummary => $"{OT} ({Version}) - {PlayTimeString}";
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public override string Extension => this.GCExtension();
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public override PersonalTable3 Personal => PersonalTable.RS;
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public override IReadOnlyList<ushort> HeldItems => Legal.HeldItems_COLO;
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public SAV3GCMemoryCard? MemoryCard { get; init; }
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// 3 Save files are stored
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// 0x0000-0x6000 contains memory card data
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// 0x6000-0x60000 contains the 3 save slots
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// 0x5A000 / 3 = 0x1E000 per save slot
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// Checksum is SHA1 over 0-0x1DFD7, stored in the last 20 bytes of the save slot.
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// Another SHA1 hash is 0x1DFD8, for 20 bytes. Unknown purpose.
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// Checksum is used as the crypto key.
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private const int SLOT_SIZE = 0x1E000;
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private const int SLOT_START = 0x6000;
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private const int SLOT_COUNT = 3;
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private const int sha1HashSize = 20;
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private int SaveCount = -1;
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private int SaveIndex = -1;
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private readonly StrategyMemo StrategyMemo;
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public const int MaxShadowID = 0x80; // 128
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private int Memo;
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private readonly byte[] BAK;
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public SAV3Colosseum() : base(SaveUtil.SIZE_G3COLO)
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{
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BAK = Array.Empty<byte>();
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StrategyMemo = Initialize();
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ClearBoxes();
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}
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public SAV3Colosseum(byte[] data) : base(data)
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{
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BAK = data;
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InitializeData();
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StrategyMemo = Initialize();
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}
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private StrategyMemo Initialize()
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{
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// Trainer1 = 0x00078;
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Party = 0x000A8;
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Box = 0x00B90;
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DaycareOffset = 0x08170;
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Memo = 0x082B0;
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// Since PartyCount is not stored in the save file,
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// Count up how many party slots are active.
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for (int i = 0; i < 6; i++)
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{
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if (GetPartySlot(Data, GetPartyOffset(i)).Species != 0)
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PartyCount++;
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}
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var memo = new StrategyMemo(Data.AsSpan(Memo), xd: false);
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return memo;
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}
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private void InitializeData()
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{
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// Scan all 3 save slots for the highest counter
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for (int i = 0; i < SLOT_COUNT; i++)
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{
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int slotOffset = SLOT_START + (i * SLOT_SIZE);
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int SaveCounter = ReadInt32BigEndian(Data.AsSpan(slotOffset + 4));
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if (SaveCounter <= SaveCount)
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continue;
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SaveCount = SaveCounter;
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SaveIndex = i;
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}
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// Decrypt most recent save slot
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{
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int slotOffset = SLOT_START + (SaveIndex * SLOT_SIZE);
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ReadOnlySpan<byte> slot = Data.AsSpan(slotOffset, SLOT_SIZE);
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Span<byte> digest = stackalloc byte[sha1HashSize];
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slot[^sha1HashSize..].CopyTo(digest);
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// Decrypt Slot
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Data = DecryptColosseum(slot, digest);
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}
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}
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protected override byte[] GetFinalData()
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{
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var newFile = GetInnerData();
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// Return the gci if Memory Card is not being exported
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if (MemoryCard is null)
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return newFile;
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MemoryCard.WriteSaveGameData(newFile);
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return MemoryCard.Data;
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}
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private byte[] GetInnerData()
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{
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StrategyMemo.Write().CopyTo(Data, Memo);
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SetChecksums();
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// Get updated save slot data
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ReadOnlySpan<byte> slot = Data;
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Span<byte> digest = stackalloc byte[sha1HashSize];
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slot[^sha1HashSize..].CopyTo(digest);
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byte[] newSAV = EncryptColosseum(slot, digest);
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// Put save slot back in original save data
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byte[] newFile = MemoryCard != null ? MemoryCard.ReadSaveGameData().ToArray() : (byte[])BAK.Clone();
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Array.Copy(newSAV, 0, newFile, SLOT_START + (SaveIndex * SLOT_SIZE), newSAV.Length);
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return newFile;
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}
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// Configuration
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protected override SAV3Colosseum CloneInternal() => new(GetInnerData()) { MemoryCard = MemoryCard };
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protected override int SIZE_STORED => PokeCrypto.SIZE_3CSTORED;
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protected override int SIZE_PARTY => PokeCrypto.SIZE_3CSTORED; // unused
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public override CK3 BlankPKM => new();
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public override Type PKMType => typeof(CK3);
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public override ushort MaxMoveID => Legal.MaxMoveID_3;
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public override ushort MaxSpeciesID => Legal.MaxSpeciesID_3;
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public override int MaxAbilityID => Legal.MaxAbilityID_3;
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public override int MaxBallID => Legal.MaxBallID_3;
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public override int MaxItemID => Legal.MaxItemID_3_COLO;
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public override int MaxGameID => Legal.MaxGameID_3;
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public override int MaxEV => 255;
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public override int Generation => 3;
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public override EntityContext Context => EntityContext.Gen3;
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protected override int GiftCountMax => 1;
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public override int MaxStringLengthOT => 10; // as evident by Mattle Ho-Oh
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public override int MaxStringLengthNickname => 10;
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public override int MaxMoney => 9999999;
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public override int BoxCount => 3;
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public override bool IsPKMPresent(ReadOnlySpan<byte> data) => EntityDetection.IsPresentGC(data);
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private static byte[] EncryptColosseum(ReadOnlySpan<byte> input, Span<byte> digest)
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{
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if (input.Length != SLOT_SIZE)
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throw new ArgumentException("Incorrect slot size", nameof(input));
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byte[] output = input.ToArray();
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// NOT key
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for (int i = 0; i < digest.Length; i++)
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digest[i] = (byte)~digest[i];
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const int start = 0x18;
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const int end = (SLOT_SIZE - (2 * sha1HashSize));
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var crypt = output.AsSpan();
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for (int i = start; i < end; i += sha1HashSize)
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{
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var slice = crypt.Slice(i, digest.Length);
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for (int j = 0; j < digest.Length; j++)
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slice[j] ^= digest[j];
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SHA1.HashData(slice, digest); // update digest
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}
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return output;
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}
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private static byte[] DecryptColosseum(ReadOnlySpan<byte> input, Span<byte> digest)
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{
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if (input.Length != SLOT_SIZE)
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throw new ArgumentException("Incorrect slot size", nameof(input));
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byte[] output = input.ToArray();
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// NOT key
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for (int i = 0; i < digest.Length; i++)
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digest[i] = (byte)~digest[i];
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Span<byte> hash = stackalloc byte[sha1HashSize];
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const int start = 0x18;
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const int end = (SLOT_SIZE - (2 * sha1HashSize));
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var crypt = output.AsSpan();
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for (int i = start; i < end; i += sha1HashSize)
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{
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var slice = crypt.Slice(i, Math.Min(crypt.Length - i, sha1HashSize));
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SHA1.HashData(slice, hash); // update digest
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for (int j = 0; j < slice.Length; j++)
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slice[j] ^= digest[j];
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hash.CopyTo(digest); // for use in next loop
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}
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return output;
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}
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protected override void SetChecksums()
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{
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var data = Data.AsSpan();
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var header = data[..0x20];
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var payload = data[..(SLOT_SIZE - (2 * sha1HashSize))];
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var hash = data[^sha1HashSize..];
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var headerCHK = data[0x0C..];
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// Clear Header Checksum
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WriteInt32BigEndian(headerCHK, 0);
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// Compute checksum of data
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SHA1.HashData(payload, hash);
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// Compute new header checksum
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int newHC = ComputeHeaderChecksum(header, hash);
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// Set Header Checksum
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WriteInt32BigEndian(headerCHK, newHC);
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}
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private static int ComputeHeaderChecksum(Span<byte> header, Span<byte> hash)
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{
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int result = 0;
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for (int i = 0; i < 0x18; i += 4)
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result -= ReadInt32BigEndian(header[i..]);
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result -= ReadInt32BigEndian(header[0x18..]) ^ ~ReadInt32BigEndian(hash);
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result -= ReadInt32BigEndian(header[0x1C..]) ^ ~ReadInt32BigEndian(hash[4..]);
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return result;
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}
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public override bool ChecksumsValid => !ChecksumInfo.Contains("Invalid");
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public override string ChecksumInfo
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{
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get
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{
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var data = Data.AsSpan();
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var header = data[..0x20];
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var payload = data[..(SLOT_SIZE - (2 * sha1HashSize))];
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var storedHash = data[^sha1HashSize..];
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var hc = header[0x0C..];
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int oldHC = ReadInt32BigEndian(hc);
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// Clear Header Checksum
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WriteInt32BigEndian(hc, 0);
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Span<byte> currentHash = stackalloc byte[sha1HashSize];
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SHA1.HashData(payload, currentHash);
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// Compute new header checksum
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int newHC = ComputeHeaderChecksum(header, currentHash);
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// Restore old header checksum
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WriteInt32BigEndian(hc, oldHC);
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bool isHeaderValid = newHC == oldHC;
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bool isBodyValid = storedHash.SequenceEqual(currentHash);
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static string valid(bool s) => s ? "Valid" : "Invalid";
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return $"Header Checksum {valid(isHeaderValid)}, Body Checksum {valid(isBodyValid)}.";
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}
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}
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// Trainer Info
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public override GameVersion Version { get => GameVersion.COLO; protected set { } }
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// Storage
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public override int GetPartyOffset(int slot)
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{
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return Party + (SIZE_STORED * slot);
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}
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public override int GetBoxOffset(int box)
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{
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return Box + (((30 * SIZE_STORED) + 0x14)*box) + 0x14;
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}
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public override string GetBoxName(int box)
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{
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return GetString(Box + (0x24A4 * box), 16);
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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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SetString(Data.AsSpan(Box + (0x24A4 * box), 16), value, 8, StringConverterOption.ClearZero);
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}
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protected override CK3 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 new(data);
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}
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protected override byte[] DecryptPKM(byte[] data) => data;
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protected override void SetPKM(PKM pk, bool isParty = false)
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{
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if (pk is not CK3 ck3)
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return;
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ck3.CurrentRegion = (byte)CurrentRegion;
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ck3.OriginalRegion = (byte)OriginalRegion;
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}
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protected override void SetDex(PKM pk)
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{
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if (pk.Species is 0 or > Legal.MaxSpeciesID_3)
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return;
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if (pk.IsEgg)
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return;
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// Dex Related
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var entry = StrategyMemo.GetEntry(pk.Species);
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if (entry.IsEmpty) // Populate
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{
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entry.Species = pk.Species;
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entry.PID = pk.PID;
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entry.ID32 = pk.ID32;
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}
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if (entry.Matches(pk.Species, pk.PID, pk.ID32))
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{
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entry.Seen = true;
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entry.Owned = true;
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}
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StrategyMemo.SetEntry(entry);
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}
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// Config
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private const int Config = 0x08;
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public GCVersion GCGameIndex { get => (GCVersion)Data[Config + 0x00]; set => Data[Config + 0x00] = (byte)value; }
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public GCRegion CurrentRegion { get => (GCRegion)Data[Config + 0x01]; set => Data[Config + 0x01] = (byte)value; }
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public GCRegion OriginalRegion { get => (GCRegion)Data[Config + 0x02]; set => Data[Config + 0x02] = (byte)value; }
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public LanguageGC GCLanguage { get => (LanguageGC)Data[Config + 0x03]; set => Data[Config + 0x03] = (byte)value; }
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public override int Language { get => (int)GCLanguage.ToLanguageID(); set => GCLanguage = ((LanguageID)value).ToLanguageGC(); }
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private TimeSpan PlayedSpan
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{
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get => TimeSpan.FromSeconds(ReadSingleBigEndian(Data.AsSpan(Config + 0x20)));
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set => WriteSingleBigEndian(Data.AsSpan(Config + 0x20), (float)value.TotalSeconds);
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}
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public override int PlayedHours
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{
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get => (ushort)PlayedSpan.TotalHours;
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set { var time = PlayedSpan; PlayedSpan = time - TimeSpan.FromHours((int)time.TotalHours) + TimeSpan.FromHours(value); }
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}
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public override int PlayedMinutes
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{
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get => (byte)PlayedSpan.Minutes;
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set { var time = PlayedSpan; PlayedSpan = time - TimeSpan.FromMinutes(time.Minutes) + TimeSpan.FromMinutes(value); }
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}
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public override int PlayedSeconds
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{
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get => (byte)PlayedSpan.Seconds;
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set { var time = PlayedSpan; PlayedSpan = time - TimeSpan.FromSeconds(time.Seconds) + TimeSpan.FromSeconds(value); }
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}
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// Trainer Info (offset 0x78, length 0xB18, end @ 0xB90)
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public override string OT { get => GetString(0x78, 20); set { SetString(Data.AsSpan(0x78, 20), value, 10, StringConverterOption.ClearZero); OT2 = value; } }
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public string OT2 { get => GetString(0x8C, 20); set => SetString(Data.AsSpan(0x8C, 20), value, 10, StringConverterOption.ClearZero); }
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public override uint ID32 { get => ReadUInt32BigEndian(Data.AsSpan(0xA4)); set => WriteUInt32BigEndian(Data.AsSpan(0xA4), value); }
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public override ushort SID16 { get => ReadUInt16BigEndian(Data.AsSpan(0xA4)); set => WriteUInt16BigEndian(Data.AsSpan(0xA4), value); }
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public override ushort TID16 { get => ReadUInt16BigEndian(Data.AsSpan(0xA6)); set => WriteUInt16BigEndian(Data.AsSpan(0xA6), value); }
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public override int Gender { get => Data[0xAF8]; set => Data[0xAF8] = (byte)value; }
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public override uint Money { get => ReadUInt32BigEndian(Data.AsSpan(0xAFC)); set => WriteUInt32BigEndian(Data.AsSpan(0xAFC), value); }
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public uint Coupons { get => ReadUInt32BigEndian(Data.AsSpan(0xB00)); set => WriteUInt32BigEndian(Data.AsSpan(0xB00), value); }
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public string RUI_Name { get => GetString(0xB3A, 20); set => SetString(Data.AsSpan(0xB3A, 20), value, 10, StringConverterOption.ClearZero); }
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public override IReadOnlyList<InventoryPouch> Inventory
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{
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get
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{
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InventoryPouch[] pouch =
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{
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new InventoryPouch3GC(InventoryType.Items, Legal.Pouch_Items_COLO, 99, 0x007F8, 20), // 20 COLO, 30 XD
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new InventoryPouch3GC(InventoryType.KeyItems, Legal.Pouch_Key_COLO, 1, 0x00848, 43),
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new InventoryPouch3GC(InventoryType.Balls, Legal.Pouch_Ball_RS, 99, 0x008F4, 16),
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new InventoryPouch3GC(InventoryType.TMHMs, Legal.Pouch_TM_RS, 99, 0x00934, 64), // no HMs
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new InventoryPouch3GC(InventoryType.Berries, Legal.Pouch_Berries_RS, 999, 0x00A34, 46),
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new InventoryPouch3GC(InventoryType.Medicine, Legal.Pouch_Cologne_COLO, 99, 0x00AEC, 3), // Cologne
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};
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return pouch.LoadAll(Data);
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}
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set => value.SaveAll(Data);
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}
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// Daycare Structure:
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// 0x00 -- Occupied
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// 0x01 -- Deposited Level
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// 0x02-0x03 -- unused?
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// 0x04-0x07 -- Initial EXP
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public override int GetDaycareSlotOffset(int loc, int slot) { return DaycareOffset + 8; }
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public override uint? GetDaycareEXP(int loc, int slot) { return null; }
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public override bool? IsDaycareOccupied(int loc, int slot) { return null; }
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public override void SetDaycareEXP(int loc, int slot, uint EXP) { }
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public override void SetDaycareOccupied(int loc, int slot, bool occupied) { }
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public override string GetString(ReadOnlySpan<byte> data) => StringConverter3GC.GetString(data);
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public override int SetString(Span<byte> destBuffer, ReadOnlySpan<char> value, int maxLength, StringConverterOption option)
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{
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return StringConverter3GC.SetString(destBuffer, value, maxLength, option);
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}
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}
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