mirror of
https://github.com/kwsch/PKHeX
synced 2024-12-24 19:33:10 +00:00
47071b41f3
Existing `get`/`set` logic is flawed in that it doesn't work on Big Endian operating systems, and it allocates heap objects when it doesn't need to. `System.Buffers.Binary.BinaryPrimitives` in the `System.Memory` NuGet package provides both Little Endian and Big Endian methods to read and write data; all the `get`/`set` operations have been reworked to use this new API. This removes the need for PKHeX's manual `BigEndian` class, as all functions are already covered by the BinaryPrimitives API. The `StringConverter` has now been rewritten to accept a Span to read from & write to, no longer requiring a temporary StringBuilder. Other Fixes included: - The Super Training UI for Gen6 has been reworked according to the latest block structure additions. - Cloning a Stadium2 Save File now works correctly (opening from the Folder browser list). - Checksum & Sanity properties removed from parent PKM class, and is now implemented via interface.
68 lines
2.2 KiB
C#
68 lines
2.2 KiB
C#
using System;
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using static System.Buffers.Binary.BinaryPrimitives;
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namespace PKHeX.Core
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{
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/// <summary>
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/// Gen6+ Block Info (inside BEEF chunk)
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/// </summary>
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public abstract class BlockInfo3DS : BlockInfo
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{
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private readonly int BlockInfoOffset;
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// ==chunk def== @ BlockInfoOffset
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// u64 timestamp1
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// u64 timestamp2
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// u8[4] BEEF magic
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// n*{blockInfo}, where n varies per sav type
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// ==block info def==
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// u32 length
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// u16 id
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// u16 checksum
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// when stored, each block size is rounded up to nearest 0x200, and the next chunk is immediately after
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protected BlockInfo3DS(int bo, uint id, int ofs, int len)
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{
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BlockInfoOffset = bo;
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ID = id;
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Offset = ofs;
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Length = len;
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}
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private int ChecksumOffset => BlockInfoOffset + 0x14 + ((int)ID * 8) + 6;
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protected abstract ushort GetChecksum(Span<byte> data);
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protected override bool ChecksumValid(Span<byte> data)
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{
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ushort chk = GetChecksum(data);
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var old = ReadUInt16LittleEndian(data[ChecksumOffset..]);
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return chk == old;
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}
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protected override void SetChecksum(Span<byte> data)
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{
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ushort chk = GetChecksum(data);
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WriteUInt16LittleEndian(data[ChecksumOffset..], chk);
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}
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}
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public sealed class BlockInfo6 : BlockInfo3DS
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{
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public BlockInfo6(int bo, uint id, int ofs, int len) : base(bo, id, ofs, len) { }
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protected override ushort GetChecksum(Span<byte> data) => Checksums.CRC16_CCITT(data.Slice(Offset, Length));
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}
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public sealed class BlockInfo7 : BlockInfo3DS
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{
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public BlockInfo7(int bo, uint id, int ofs, int len) : base(bo, id, ofs, len) { }
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protected override ushort GetChecksum(Span<byte> data) => Checksums.CRC16Invert(data.Slice(Offset, Length));
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}
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public sealed class BlockInfo7b : BlockInfo3DS
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{
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public BlockInfo7b(int bo, uint id, int ofs, int len) : base(bo, id, ofs, len) { }
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protected override ushort GetChecksum(Span<byte> data) => Checksums.CRC16NoInvert(data.Slice(Offset, Length));
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}
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}
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