40 lines
1.4 KiB
C#
40 lines
1.4 KiB
C#
using System;
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using System.Text;
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namespace AssetStudio
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{
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public static class ByteArrayExtensions
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{
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public static bool IsNullOrEmpty<T>(this T[] array) => array == null || array.Length == 0;
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public static byte[] ToUInt4Array(this byte[] source) => ToUInt4Array(source, 0, source.Length);
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public static byte[] ToUInt4Array(this byte[] source, int offset, int size)
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{
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var buffer = new byte[size * 2];
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for (var i = 0; i < size; i++)
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{
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var idx = i * 2;
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buffer[idx] = (byte)(source[offset + i] >> 4);
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buffer[idx + 1] = (byte)(source[offset + i] & 0xF);
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}
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return buffer;
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}
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public static int Search(this byte[] src, string value, int offset = 0) => Search(src.AsSpan(), Encoding.UTF8.GetBytes(value), offset);
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public static int Search(this Span<byte> src, byte[] pattern, int offset = 0)
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{
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int maxFirstCharSlot = src.Length - pattern.Length + 1;
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for (int i = offset; i < maxFirstCharSlot; i++)
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{
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if (src[i] != pattern[0])
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continue;
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for (int j = pattern.Length - 1; j >= 1; j--)
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{
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if (src[i + j] != pattern[j]) break;
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if (j == 1) return i;
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}
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}
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return -1;
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}
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}
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}
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