[英]Find bytes from an offset
所以我有这个:
public static long FindPosition(Stream stream, byte[] byteSequence)
{
if (byteSequence.Length > stream.Length)
return -1;
byte[] buffer = new byte[byteSequence.Length];
using (BufferedStream bufStream = new BufferedStream(stream, byteSequence.Length))
{
int i;
while ((i = bufStream.Read(buffer, 0, byteSequence.Length)) == byteSequence.Length)
{
if (byteSequence.SequenceEqual(buffer))
return bufStream.Position - byteSequence.Length;
else
bufStream.Position -= byteSequence.Length - PadLeftSequence(buffer, byteSequence);
}
}
return -1;
}
private static int PadLeftSequence(byte[] bytes, byte[] seqBytes)
{
int i = 1;
while (i < bytes.Length)
{
int n = bytes.Length - i;
byte[] aux1 = new byte[n];
byte[] aux2 = new byte[n];
Array.Copy(bytes, i, aux1, 0, n);
Array.Copy(seqBytes, aux2, n);
if (aux1.SequenceEqual(aux2))
return i;
i++;
}
return i;
}
哪个方法可以完美地获取具有特定字节组的偏移量,但是现在我要反过来,从特定偏移量中查找一组字节。 我怎样才能做到这一点?
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