60 lines
1.6 KiB
C#
60 lines
1.6 KiB
C#
// Copyright (c) 2023 Timothy Schenk. Subject to the GNU AGPL Version 3 License.
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using System.Reflection;
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namespace Wonderking.Game;
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public abstract class DataReader<T>
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{
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private readonly string _datFileName;
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private readonly byte _xorKey;
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protected readonly ushort SizeOfEntry;
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protected DataReader(string path)
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{
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Path = path;
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_xorKey = GetXorKey();
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SizeOfEntry = GetSizeOfEntry();
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_datFileName = GetDatFileName();
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DatFileContent = GetDatFileContent(path).ToArray();
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}
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private protected string Path { get; init; }
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protected byte[] DatFileContent { get; }
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public abstract uint GetAmountOfEntries();
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public abstract T GetEntry(uint entryId);
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private static ushort GetSizeOfEntry()
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{
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return typeof(T).GetCustomAttribute<GameDataMetadataAttribute>()?.DataEntrySize ??
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throw new NotSupportedException("DataEntrySize is null");
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}
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private static string GetDatFileName()
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{
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return typeof(T).GetCustomAttribute<GameDataMetadataAttribute>()?.DatFileName ??
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throw new NotSupportedException("DatFileName is null");
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}
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private static byte GetXorKey()
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{
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return typeof(T).GetCustomAttribute<GameDataMetadataAttribute>()?.XorKey ??
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throw new NotSupportedException("XorKey is null");
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}
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private Span<byte> GetDatFileContent(string path)
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{
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var fileData = File.ReadAllBytes(path + _datFileName);
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var data = new byte[fileData.Length];
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for (var i = 0; i < fileData.Length; i++)
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{
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data[i] = (byte)(fileData[i] ^ _xorKey);
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}
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return data;
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}
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}
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