mirror of
https://github.com/kwsch/PKHeX
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fc754b346b
[Language Reference](https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/proposals/csharp-10.0/file-scoped-namespaces) Updates all the files, one less level of indentation. Some small changes were made to API surfaces, renaming `PKM pkm` -> `PKM pk`, and `LegalityAnalysis.pkm` -> `LegalityAnalysis.Entity`
51 lines
1.7 KiB
C#
51 lines
1.7 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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/// <summary>
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/// Finds the index of the most recent save block for <see cref="SAV4"/> blocks.
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/// </summary>
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public static class SAV4BlockDetection
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{
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private const int First = 0;
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private const int Second = 1;
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private const int Same = 2;
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/// <summary>
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/// Compares the footers of the two blocks to determine which is newest.
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/// </summary>
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/// <returns>0=Primary, 1=Secondary.</returns>
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public static int CompareFooters(ReadOnlySpan<byte> data, int offset1, int offset2)
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{
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// Major Counters
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var major1 = ReadUInt32LittleEndian(data[offset1..]);
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var major2 = ReadUInt32LittleEndian(data[offset2..]);
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var result1 = CompareCounters(major1, major2);
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if (result1 != Same)
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return result1;
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// Minor Counters
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var minor1 = ReadUInt32LittleEndian(data[(offset1 + 4)..]);
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var minor2 = ReadUInt32LittleEndian(data[(offset2 + 4)..]);
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var result2 = CompareCounters(minor1, minor2);
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return result2 == Second ? Second : First; // Same -> First, shouldn't happen for valid saves.
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}
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private static int CompareCounters(uint counter1, uint counter2)
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{
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// Uninitialized -- only continue if a rollover case (humanly impossible)
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if (counter1 == uint.MaxValue && counter2 != uint.MaxValue - 1)
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return Second;
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if (counter2 == uint.MaxValue && counter1 != uint.MaxValue - 1)
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return First;
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// Different
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if (counter1 > counter2)
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return First;
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if (counter1 < counter2)
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return Second;
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return Same;
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}
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}
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