pyscutclient_func.py

#!/usr/bin/python
#coding=utf8



#把一个'0'~'255'的字符串或数字转换成十六进制的char 如 '49'->'\x31'  49->'\x31'
def strtohexchar(s):
	return chr(int(s))


def encode(base):
	result = 0
	for i in range(8):
		result <<= 1
		result |= base & 0x01
		base >>= 1
        r = ~result
        if r<0:
        	r += 256   #在python中执行  ～1会返回-2，应加256（因为不是unsigned char）
        return r


def gen_checksum(buf):
	table = (0x00,0x00,0x21,0x10,0x42,0x20,0x63,0x30,0x84,0x40,0xA5,0x50,0xC6,0x60,0xE7,0x70,0x08,0x81,0x29,0x91,0x4A,0xA1,0x6B,0xB1,0x8C,0xC1,0xAD,0xD1,0xCE,0xE1,0xEF,0xF1,0x31,0x12,0x10,0x02,0x73,0x32,0x52,0x22,0xB5,0x52,0x94,0x42,0xF7,0x72,0xD6,0x62,0x39,0x93,0x18,0x83,0x7B,0xB3,0x5A,0xA3,0xBD,0xD3,0x9C,0xC3,0xFF,0xF3,0xDE,0xE3,0x62,0x24,0x43,0x34,0x20,0x04,0x01,0x14,0xE6,0x64,0xC7,0x74,0xA4,0x44,0x85,0x54,0x6A,0xA5,0x4B,0xB5,0x28,0x85,0x09,0x95,0xEE,0xE5,0xCF,0xF5,0xAC,0xC5,0x8D,0xD5,0x53,0x36,0x72,0x26,0x11,0x16,0x30,0x06,0xD7,0x76,0xF6,0x66,0x95,0x56,0xB4,0x46,0x5B,0xB7,0x7A,0xA7,0x19,0x97,0x38,0x87,0xDF,0xF7,0xFE,0xE7,0x9D,0xD7,0xBC,0xC7,0xC4,0x48,0xE5,0x58,0x86,0x68,0xA7,0x78,0x40,0x08,0x61,0x18,0x02,0x28,0x23,0x38,0xCC,0xC9,0xED,0xD9,0x8E,0xE9,0xAF,0xF9,0x48,0x89,0x69,0x99,0x0A,0xA9,0x2B,0xB9,0xF5,0x5A,0xD4,0x4A,0xB7,0x7A,0x96,0x6A,0x71,0x1A,0x50,0x0A,0x33,0x3A,0x12,0x2A,0xFD,0xDB,0xDC,0xCB,0xBF,0xFB,0x9E,0xEB,0x79,0x9B,0x58,0x8B,0x3B,0xBB,0x1A,0xAB,0xA6,0x6C,0x87,0x7C,0xE4,0x4C,0xC5,0x5C,0x22,0x2C,0x03,0x3C,0x60,0x0C,0x41,0x1C,0xAE,0xED,0x8F,0xFD,0xEC,0xCD,0xCD,0xDD,0x2A,0xAD,0x0B,0xBD,0x68,0x8D,0x49,0x9D,0x97,0x7E,0xB6,0x6E,0xD5,0x5E,0xF4,0x4E,0x13,0x3E,0x32,0x2E,0x51,0x1E,0x70,0x0E,0x9F,0xFF,0xBE,0xEF,0xDD,0xDF,0xFC,0xCF,0x1B,0xBF,0x3A,0xAF,0x59,0x9F,0x78,0x8F,0x88,0x91,0xA9,0x81,0xCA,0xB1,0xEB,0xA1,0x0C,0xD1,0x2D,0xC1,0x4E,0xF1,0x6F,0xE1,0x80,0x10,0xA1,0x00,0xC2,0x30,0xE3,0x20,0x04,0x50,0x25,0x40,0x46,0x70,0x67,0x60,0xB9,0x83,0x98,0x93,0xFB,0xA3,0xDA,0xB3,0x3D,0xC3,0x1C,0xD3,0x7F,0xE3,0x5E,0xF3,0xB1,0x02,0x90,0x12,0xF3,0x22,0xD2,0x32,0x35,0x42,0x14,0x52,0x77,0x62,0x56,0x72,0xEA,0xB5,0xCB,0xA5,0xA8,0x95,0x89,0x85,0x6E,0xF5,0x4F,0xE5,0x2C,0xD5,0x0D,0xC5,0xE2,0x34,0xC3,0x24,0xA0,0x14,0x81,0x04,0x66,0x74,0x47,0x64,0x24,0x54,0x05,0x44,0xDB,0xA7,0xFA,0xB7,0x99,0x87,0xB8,0x97,0x5F,0xE7,0x7E,0xF7,0x1D,0xC7,0x3C,0xD7,0xD3,0x26,0xF2,0x36,0x91,0x06,0xB0,0x16,0x57,0x66,0x76,0x76,0x15,0x46,0x34,0x56,0x4C,0xD9,0x6D,0xC9,0x0E,0xF9,0x2F,0xE9,0xC8,0x99,0xE9,0x89,0x8A,0xB9,0xAB,0xA9,0x44,0x58,0x65,0x48,0x06,0x78,0x27,0x68,0xC0,0x18,0xE1,0x08,0x82,0x38,0xA3,0x28,0x7D,0xCB,0x5C,0xDB,0x3F,0xEB,0x1E,0xFB,0xF9,0x8B,0xD8,0x9B,0xBB,0xAB,0x9A,0xBB,0x75,0x4A,0x54,0x5A,0x37,0x6A,0x16,0x7A,0xF1,0x0A,0xD0,0x1A,0xB3,0x2A,0x92,0x3A,0x2E,0xFD,0x0F,0xED,0x6C,0xDD,0x4D,0xCD,0xAA,0xBD,0x8B,0xAD,0xE8,0x9D,0xC9,0x8D,0x26,0x7C,0x07,0x6C,0x64,0x5C,0x45,0x4C,0xA2,0x3C,0x83,0x2C,0xE0,0x1C,0xC1,0x0C,0x1F,0xEF,0x3E,0xFF,0x5D,0xCF,0x7C,0xDF,0x9B,0xAF,0xBA,0xBF,0xD9,0x8F,0xF8,0x9F,0x17,0x6E,0x36,0x7E,0x55,0x4E,0x74,0x5E,0x93,0x2E,0xB2,0x3E,0xD1,0x0E,0xF0,0x1E)
	
	for i in range(21):
		index = buf[21] ^ buf[i]
		buf[21] = buf[22] ^ table[index*2+1]
		buf[22] = table[index*2]
	for i in range(23):
		buf[i] = encode(buf[i])
	
	
	returnstr = ''
	for s in buf:
		returnstr += strtohexchar(s)
	return returnstr  #最终返回字符串 '\x12\x34\x5f' 共23字节