mirror of
https://github.com/kwsch/PKHeX
synced 2024-11-27 06:20:25 +00:00
316 lines
13 KiB
C#
316 lines
13 KiB
C#
using System;
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using System.Linq;
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using System.Text;
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namespace PKHeX.Core
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{
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/* GameCube memory card format data, checksum and code to extract files based on Dolphin code, adapted from C++ to C#
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* https://github.com/dolphin-emu/dolphin/
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*/
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public enum GCMemoryCardState
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{
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Invalid,
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NoPkmSaveGame,
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SaveGameCOLO,
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SaveGameXD,
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SaveGameRSBOX,
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MultipleSaveGame,
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DuplicateCOLO,
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DuplicateXD,
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DuplicateRSBOX,
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}
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public sealed class SAV3GCMemoryCard
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{
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private const int BLOCK_SIZE = 0x2000;
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private const int MBIT_TO_BLOCKS = 0x10;
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private const int DENTRY_STRLEN = 0x20;
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private const int DENTRY_SIZE = 0x40;
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private static int NumEntries_Directory => BLOCK_SIZE / DENTRY_SIZE;
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private static readonly int[] validMCSizes =
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{
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0x80000, // 512KB 59 Blocks Memory Card
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0x100000, // 1MB
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0x200000, // 2MB
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0x400000, // 4MB 251 Blocks Memory Card
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0x800000, // 8MB
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0x1000000, // 16MB 1019 Blocks Default Dolphin Memory Card
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0x2000000, // 64MB
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0x4000000 // 128 MB
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};
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public static bool IsMemoryCardSize(long Size) => validMCSizes.Contains((int)Size);
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public static bool IsMemoryCardSize(byte[] Data) => IsMemoryCardSize(Data.Length);
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private readonly byte[] RawEmpty_DEntry = { 0xFF, 0xFF, 0xFF, 0xFF };
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// Control blocks
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private const int Header_Block = 0;
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private const int Directory_Block = 1;
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private const int DirectoryBackup_Block = 2;
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private const int BlockAlloc_Block = 3;
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private const int BlockAllocBackup_Block = 4;
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private static int Header => BLOCK_SIZE * Header_Block;
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private static int Directory => BLOCK_SIZE * Directory_Block;
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private static int DirectoryBAK => BLOCK_SIZE * DirectoryBackup_Block;
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private static int BlockAlloc => BLOCK_SIZE * BlockAlloc_Block;
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private static int BlockAllocBAK => BLOCK_SIZE * BlockAlloc_Block;
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// Checksums
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private void getChecksum(int block, int offset, int length, out ushort csum, out ushort inv_csum)
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{
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csum = inv_csum = 0;
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var ofs = block * BLOCK_SIZE + offset;
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for (int i = 0; i < length; i++)
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{
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var val = BigEndian.ToUInt16(Data, ofs + i*2);
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csum += val;
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inv_csum += (ushort)(val ^ 0xffff);
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}
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if (csum == 0xffff)
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csum = 0;
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if (inv_csum == 0xffff)
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inv_csum = 0;
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}
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private uint verifyChecksums()
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{
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ushort csum, csum_inv;
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uint results = 0;
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getChecksum(Header_Block, 0, 0xFE, out csum, out csum_inv);
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if (Header_Checksum != csum || (Header_Checksum_Inv != csum_inv))
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results |= 1;
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getChecksum(Directory_Block, 0, 0xFFE, out csum, out csum_inv);
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if (Directory_Checksum != csum || (Directory_Checksum_Inv != csum_inv))
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results |= 2;
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getChecksum(DirectoryBackup_Block, 0, 0xFFE, out csum, out csum_inv);
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if (DirectoryBAK_Checksum != csum || (DirectoryBAK_Checksum_Inv != csum_inv))
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results |= 4;
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getChecksum(BlockAlloc_Block, 4, 0xFFE, out csum, out csum_inv);
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if (BlockAlloc_Checksum != csum || (BlockAlloc_Checksum_Inv != csum_inv))
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results |= 8;
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getChecksum(BlockAllocBackup_Block, 4, 0xFFE, out csum, out csum_inv);
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if ((BlockAllocBAK_Checksum != csum) || BlockAllocBAK_Checksum_Inv != csum_inv)
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results |= 16;
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return results;
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}
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// Structure
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private int Header_Size => BigEndian.ToUInt16(Data, Header + 0x0022);
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private ushort Header_Checksum => BigEndian.ToUInt16(Data, Header + 0x01fc);
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private ushort Header_Checksum_Inv => BigEndian.ToUInt16(Data, Header + 0x01fe);
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// Encoding (Windows-1252 or Shift JIS)
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private int Header_Encoding => BigEndian.ToUInt16(Data, Header + 0x0024);
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private bool Header_Japanese => Header_Encoding == 1;
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private Encoding EncodingType => Header_Japanese ? Encoding.GetEncoding(1252) : Encoding.GetEncoding(932);
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private int Directory_UpdateCounter => BigEndian.ToUInt16(Data, Directory + 0x1ffa);
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private int Directory_Checksum => BigEndian.ToUInt16(Data, Directory + 0x1ffc);
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private int Directory_Checksum_Inv => BigEndian.ToUInt16(Data, Directory + 0x1ffe);
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private int DirectoryBAK_UpdateCounter => BigEndian.ToUInt16(Data, DirectoryBAK + 0x1ffa);
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private int DirectoryBAK_Checksum => BigEndian.ToUInt16(Data, DirectoryBAK + 0x1ffc);
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private int DirectoryBAK_Checksum_Inv => BigEndian.ToUInt16(Data, DirectoryBAK + 0x1ffe);
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private int BlockAlloc_Checksum => BigEndian.ToUInt16(Data, BlockAlloc + 0x0000);
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private int BlockAlloc_Checksum_Inv => BigEndian.ToUInt16(Data, BlockAlloc + 0x0002);
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private int BlockAllocBAK_Checksum => BigEndian.ToUInt16(Data, BlockAllocBAK + 0x0000);
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private int BlockAllocBAK_Checksum_Inv => BigEndian.ToUInt16(Data, BlockAllocBAK + 0x0002);
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private int DirectoryBlock_Used;
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private int NumBlocks => Data.Length/BLOCK_SIZE - 5;
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private int EntryCOLO = -1;
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private int EntryXD = -1;
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private int EntryRSBOX = -1;
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private int EntrySelected = -1;
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public bool HasCOLO => EntryCOLO > -1;
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public bool HasXD => EntryXD > -1;
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public bool HasRSBOX => EntryRSBOX > -1;
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public int SaveGameCount;
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private bool IsCorruptedMemoryCard()
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{
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uint csums = verifyChecksums();
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if ((csums & 0x1) == 1) // Header checksum failed
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return true;
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if ((csums & 0x2) == 1) // directory checksum error!
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{
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if ((csums & 0x4) == 1) // backup is also wrong
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return true; // Directory checksum and directory backup checksum failed
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restoreBackup(); // backup is correct, restore
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csums = verifyChecksums(); // update checksums
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}
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if ((csums & 0x8) != 1)
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return false;
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if ((csums & 0x10) == 1) // backup is also wrong
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return true;
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// backup is correct, restore
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restoreBackup();
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return false;
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}
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private void restoreBackup()
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{
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Array.Copy(Data, DirectoryBackup_Block*BLOCK_SIZE, Data, Directory_Block*BLOCK_SIZE, BLOCK_SIZE);
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Array.Copy(Data, BlockAllocBackup_Block*BLOCK_SIZE, Data, BlockAlloc_Block*BLOCK_SIZE, BLOCK_SIZE);
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}
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public GCMemoryCardState LoadMemoryCardFile(byte[] data)
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{
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Data = data;
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if (!IsMemoryCardSize(Data))
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// Invalid size
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return GCMemoryCardState.Invalid;
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// Size in megabits, not megabytes
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int m_sizeMb = Data.Length / BLOCK_SIZE / MBIT_TO_BLOCKS;
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if (m_sizeMb != Header_Size) // Memory card file size does not match the header size
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return GCMemoryCardState.Invalid;
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if (IsCorruptedMemoryCard())
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return GCMemoryCardState.Invalid;
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// Use the most recent directory block
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DirectoryBlock_Used = DirectoryBAK_UpdateCounter > Directory_UpdateCounter
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? DirectoryBackup_Block
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: Directory_Block;
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string Empty_DEntry = EncodingType.GetString(RawEmpty_DEntry, 0, 4);
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// Search for pokemon savegames in the directory
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for (int i = 0; i < NumEntries_Directory; i++)
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{
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int offset = DirectoryBlock_Used*BLOCK_SIZE + i*DENTRY_SIZE;
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string GameCode = EncodingType.GetString(Data, offset, 4);
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if (GameCode == Empty_DEntry)
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continue;
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int FirstBlock = BigEndian.ToUInt16(Data, offset + 0x36);
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int BlockCount = BigEndian.ToUInt16(Data, offset + 0x38);
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// Memory card directory contains info for deleted files with boundaries beyond memory card size, ignore
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if (FirstBlock + BlockCount > NumBlocks)
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continue;
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if (SaveUtil.HEADER_COLO.Contains(GameCode))
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{
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if (EntryCOLO > -1) // another entry already exists
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return GCMemoryCardState.DuplicateCOLO;
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EntryCOLO = i;
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SaveGameCount++;
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}
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if (SaveUtil.HEADER_XD.Contains(GameCode))
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{
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if (EntryXD > -1) // another entry already exists
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return GCMemoryCardState.DuplicateXD;
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EntryXD = i;
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SaveGameCount++;
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}
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if (SaveUtil.HEADER_RSBOX.Contains(GameCode))
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{
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if (EntryRSBOX > -1) // another entry already exists
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return GCMemoryCardState.DuplicateRSBOX;
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EntryRSBOX = i;
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SaveGameCount++;
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}
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}
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if (SaveGameCount == 0)
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return GCMemoryCardState.NoPkmSaveGame;
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if (SaveGameCount > 1)
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return GCMemoryCardState.MultipleSaveGame;
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if (EntryCOLO > -1)
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{
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EntrySelected = EntryCOLO;
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return GCMemoryCardState.SaveGameCOLO;
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}
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if (EntryXD > -1)
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{
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EntrySelected = EntryXD;
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return GCMemoryCardState.SaveGameXD;
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}
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EntrySelected = EntryRSBOX;
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return GCMemoryCardState.SaveGameRSBOX;
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}
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public GameVersion SelectedGameVersion
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{
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get
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{
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if (EntryCOLO > -1 && EntrySelected == EntryCOLO)
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return GameVersion.COLO;
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if (EntryXD > -1 && EntrySelected == EntryXD)
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return GameVersion.XD;
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if (EntryRSBOX > -1 && EntrySelected == EntryRSBOX)
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return GameVersion.RSBOX;
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return GameVersion.Any; //Default for no game selected
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}
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}
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public void SelectSaveGame(GameVersion Game)
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{
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switch (Game)
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{
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case GameVersion.COLO: if (EntryCOLO > -1) EntrySelected = EntryCOLO; break;
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case GameVersion.XD: if (EntryXD > -1) EntrySelected = EntryXD; break;
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case GameVersion.RSBOX: if (EntryRSBOX > -1) EntrySelected = EntryRSBOX; break;
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}
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}
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public string GCISaveName => getGCISaveGameName();
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public byte[] SelectedSaveData { get => ReadSaveGameData(); set => WriteSaveGameData(value); }
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public byte[] Data { get; private set; }
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private string getGCISaveGameName()
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{
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int offset = DirectoryBlock_Used*BLOCK_SIZE + EntrySelected*DENTRY_SIZE;
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string GameCode = EncodingType.GetString(Data, offset, 4);
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string Makercode = EncodingType.GetString(Data, offset + 0x04, 2);
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string FileName = EncodingType.GetString(Data, offset + 0x08, DENTRY_STRLEN);
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return Makercode + "-" + GameCode + "-" + FileName.Replace("\0", "") + ".gci";
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}
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private byte[] ReadSaveGameData()
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{
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if (EntrySelected == -1)
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// Not selected any entry
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return null;
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int offset = DirectoryBlock_Used*BLOCK_SIZE + EntrySelected*DENTRY_SIZE;
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int FirstBlock = BigEndian.ToUInt16(Data, offset + 0x36);
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int BlockCount = BigEndian.ToUInt16(Data, offset + 0x38);
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byte[] SaveData = new byte[BlockCount * BLOCK_SIZE];
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Array.Copy(Data, FirstBlock * BLOCK_SIZE, SaveData, 0, BlockCount * BLOCK_SIZE);
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return SaveData;
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}
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private void WriteSaveGameData(byte[] SaveData)
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{
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if (EntrySelected == -1) // Can't write anywhere
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return;
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int offset = DirectoryBlock_Used*BLOCK_SIZE + EntrySelected*DENTRY_SIZE;
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int FirstBlock = BigEndian.ToUInt16(Data, offset + 0x36);
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int BlockCount = BigEndian.ToUInt16(Data, offset + 0x38);
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if (SaveData.Length != BlockCount * BLOCK_SIZE) // Invalid File Size
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return;
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Array.Copy(SaveData, 0, Data, FirstBlock * BLOCK_SIZE, BlockCount * BLOCK_SIZE);
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}
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}
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}
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