mirror of
https://github.com/kwsch/PKHeX
synced 2024-12-25 03:43:16 +00:00
57 lines
2.3 KiB
C#
57 lines
2.3 KiB
C#
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using System;
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using System.Collections.Generic;
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using static System.Buffers.Binary.BinaryPrimitives;
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namespace PKHeX.Core;
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public static class EntityDetection
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{
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private static readonly HashSet<int> Sizes = new()
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{
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PokeCrypto.SIZE_1JLIST, PokeCrypto.SIZE_1ULIST,
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PokeCrypto.SIZE_2ULIST, PokeCrypto.SIZE_2JLIST, PokeCrypto.SIZE_2STADIUM,
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PokeCrypto.SIZE_3STORED, PokeCrypto.SIZE_3PARTY,
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PokeCrypto.SIZE_3CSTORED, PokeCrypto.SIZE_3XSTORED,
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PokeCrypto.SIZE_4STORED, PokeCrypto.SIZE_4PARTY,
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PokeCrypto.SIZE_5PARTY,
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PokeCrypto.SIZE_6STORED, PokeCrypto.SIZE_6PARTY,
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PokeCrypto.SIZE_8STORED, PokeCrypto.SIZE_8PARTY,
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PokeCrypto.SIZE_8ASTORED, PokeCrypto.SIZE_8APARTY,
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};
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/// <summary>
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/// Determines if the given length is valid for a <see cref="PKM"/>.
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/// </summary>
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/// <param name="len">Data length of the file/array.</param>
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/// <returns>A <see cref="bool"/> indicating whether or not the length is valid for a <see cref="PKM"/>.</returns>
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public static bool IsSizePlausible(long len) => Sizes.Contains((int)len);
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public static bool IsPresentGB(ReadOnlySpan<byte> data) => data[0] != 0; // Species non-zero
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public static bool IsPresentGC(ReadOnlySpan<byte> data) => ReadUInt16BigEndian(data) != 0; // Species non-zero
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public static bool IsPresentGBA(ReadOnlySpan<byte> data) => (data[0x13] & 0xFB) == 2; // ignore egg flag, must be FlagHasSpecies.
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public static bool IsPresent(ReadOnlySpan<byte> data)
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{
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if (ReadUInt32LittleEndian(data) != 0) // PID
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return true;
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ushort species = ReadUInt16LittleEndian(data[8..]);
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return species != 0;
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}
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/// <summary>
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/// Gets a function that can check a byte array (at an offset) to see if a <see cref="PKM"/> is possibly present.
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/// </summary>
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/// <param name="blank"></param>
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/// <returns>Function that checks if a byte array (at an offset) has a <see cref="PKM"/> present</returns>
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public static Func<byte[], bool> GetFuncIsPresent(PKM blank)
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{
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if (blank.Format >= 4)
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return x => IsPresent(x);
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if (blank.Format <= 2)
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return x => IsPresentGB(x);
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if (blank.Data.Length <= PokeCrypto.SIZE_3PARTY)
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return x => IsPresentGBA(x);
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return x => IsPresentGC(x);
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}
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}
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