mirror of
https://github.com/kwsch/PKHeX
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8fa951bcd7
Catch_Rate => CatchRate Make Location* classes public Extract a few methods, make public Merge EncounterUtil & EncounterUtil1 add xmldoc add missing deferral for Nest8 templates improve binlinker span fetch to a single read (-1)
59 lines
2.2 KiB
C#
59 lines
2.2 KiB
C#
using System;
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using System.ComponentModel.DataAnnotations;
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using System.Diagnostics;
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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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/// Unpacks a BinLinkerAccessor generated file container into individual arrays.
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/// </summary>
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[DebuggerDisplay($"{{{nameof(Identifier)},nq}}[{{{nameof(Length)},nq}}]")]
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public readonly ref struct BinLinkerAccessor
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{
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/// <summary> Backing data object </summary>
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private readonly ReadOnlySpan<byte> Data;
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/// <summary> Total count of files available for accessing. </summary>
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public ushort Length => ReadUInt16LittleEndian(Data[2..]);
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/// <summary> Magic identifier for the file. </summary>
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public string Identifier => new([(char)Data[0], (char)Data[1]]);
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/// <summary>
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/// Retrieves a view of the entry at the requested <see cref="index"/>.
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/// </summary>
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/// <param name="index">Entry to retrieve.</param>
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public ReadOnlySpan<byte> this[int index] => GetEntry(index);
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private BinLinkerAccessor(ReadOnlySpan<byte> data) => Data = data;
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private ReadOnlySpan<byte> GetEntry(int index)
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{
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int offset = 4 + (index * sizeof(int));
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// Start and End are both 32-bit integers, sequentially.
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// Read them in one shot a 64-bit integer and decompose.
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var startEnd = ReadUInt64LittleEndian(Data[offset..]);
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int start = (int)startEnd;
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int end = (int)(startEnd >> 32);
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return Data[start..end];
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}
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/// <summary>
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/// Sanity checks the input <see cref="data"/> only in DEBUG builds, and returns a new wrapper.
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/// </summary>
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/// <param name="data">Data reference</param>
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/// <param name="identifier">Expected identifier (debug verification only)</param>
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public static BinLinkerAccessor Get(ReadOnlySpan<byte> data, [Length(2, 2)] ReadOnlySpan<byte> identifier)
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{
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SanityCheckIdentifier(data, identifier);
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return new BinLinkerAccessor(data);
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}
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[Conditional("DEBUG")]
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private static void SanityCheckIdentifier(ReadOnlySpan<byte> data, [Length(2, 2)] ReadOnlySpan<byte> identifier)
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{
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Debug.Assert(data.Length > 4);
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Debug.Assert(identifier[0] == data[0] && identifier[1] == data[1]);
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}
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}
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