57 lines
1.9 KiB
C#
57 lines
1.9 KiB
C#
using System;
|
|
using System.Text;
|
|
|
|
namespace AssetStudio
|
|
{
|
|
public static class ByteArrayExtensions
|
|
{
|
|
public static bool IsNullOrEmpty<T>(this T[] array) => array == null || array.Length == 0;
|
|
public static byte[] ToUInt4Array(this byte[] source) => ToUInt4Array(source, 0, source.Length);
|
|
public static byte[] ToUInt4Array(this byte[] source, int offset, int size)
|
|
{
|
|
var buffer = new byte[size * 2];
|
|
for (var i = 0; i < size; i++)
|
|
{
|
|
var idx = i * 2;
|
|
buffer[idx] = (byte)(source[offset + i] >> 4);
|
|
buffer[idx + 1] = (byte)(source[offset + i] & 0xF);
|
|
}
|
|
return buffer;
|
|
}
|
|
public static byte[] ToUInt8Array(this byte[] source, int offset, int size)
|
|
{
|
|
var buffer = new byte[size / 2];
|
|
for (var i = 0; i < size; i++)
|
|
{
|
|
var idx = i / 2;
|
|
if (i % 2 == 0)
|
|
{
|
|
buffer[idx] = (byte)(source[offset + i] << 4);
|
|
}
|
|
else
|
|
{
|
|
buffer[idx] |= source[offset + i];
|
|
}
|
|
}
|
|
return buffer;
|
|
}
|
|
public static int Search(this byte[] src, string value, int offset = 0) => Search(src.AsSpan(), Encoding.UTF8.GetBytes(value), offset);
|
|
public static int Search(this Span<byte> src, byte[] pattern, int offset = 0)
|
|
{
|
|
int maxFirstCharSlot = src.Length - pattern.Length + 1;
|
|
for (int i = offset; i < maxFirstCharSlot; i++)
|
|
{
|
|
if (src[i] != pattern[0])
|
|
continue;
|
|
|
|
for (int j = pattern.Length - 1; j >= 1; j--)
|
|
{
|
|
if (src[i + j] != pattern[j]) break;
|
|
if (j == 1) return i;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
}
|
|
}
|