public static class ex { public static byte[] RightShift(this byte[] ba, int n) { if (n < 0) { return ba.LeftShift(Math.Abs(n)); } byte[] ba2 = null; ba2 = ba.Clone() as byte[]; int loop = (int)Math.Ceiling(n / 8.0); byte tempByte = 0; byte tempByte2 = 0; byte Header = 0; for (int i = 0; i < loop; i++) { var tempN = i + 1 == loop ? n % 8 : 8; if (tempN == 0 && n != 0) { tempN = 8; } for (int j = 0; j < ba.Length; j++) { if (j == 0) { Header = (byte)((ba2.Last() & ((byte)(Math.Pow(2, tempN) - 1))) << (8 - tempN)); tempByte = (byte)((ba2[j] & ((byte)(Math.Pow(2, tempN) - 1))) << (8 - tempN)); ba2[j] >>= tempN; } else { tempByte2 = (byte)((ba2[j] & ((byte)(Math.Pow(2, tempN) - 1))) << (8 - tempN)); ba2[j] >>= tempN; ba2[j] |= tempByte; tempByte = tempByte2; if (j + 1 == ba.Length) { ba2[0] |= Header; } } } } return ba2; } public static byte[] LeftShift(this byte[] ba, int n) { if (n < 0) { return ba.RightShift(Math.Abs(n)); } byte[] ba2 = null; ba2 = ba.Clone() as byte[]; int loop = (int)Math.Ceiling(n / 8.0); byte tempByte = 0; byte tempByte2 = 0; byte Header = 0; for (int i = 0; i < loop; i++) { var tempN = i + 1 == loop ? n % 8 : 8; if (tempN == 0 && n != 0) { tempN = 8; } for (int j = 0; j < ba.Length; j++) { if (j == 0) { Header = (byte)(ba2.First() & ((byte)(Math.Pow(2, tempN) - 1) << (8 - tempN))); tempByte = (byte)(ba2[ba.Length - 1 - j] & ((byte)(Math.Pow(2, tempN) - 1) << (8 - tempN))); ba2[ba.Length - 1 - j] <<= tempN; } else { tempByte2 = (byte)(ba2[ba.Length - 1 - j] & ((byte)(Math.Pow(2, tempN) - 1) << (8 - tempN))); ba2[ba.Length - 1 - j] <<= tempN; ba2[ba.Length - 1 - j] |= (byte)(tempByte >> (8 - tempN)); tempByte = tempByte2; if (j + 1 == ba.Length) { ba2[j] |= (byte)(Header >> (8 - tempN)); } } } } return ba2; } }
byte[] 左移和右移
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转载自www.cnblogs.com/nocanstillbb/p/10573776.html
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