nesC写的heed算法
源代码在线查看： message.py
from array import * from config import config class Message: MSG_SIZE = config.msg_size BCAST = 0xffff addr = 0 type = 2 group = 3 length = 4 data = 5 def __init__(self, msg=None): if msg is None: self.msg = array('B', [0]*Message.MSG_SIZE) self.set8(config.group, Message.group) elif isinstance(msg, Message): self.msg = msg.msg else: self.msg = array('B', msg) def tostring(self): return self.msg.tostring() def setoffset(self, offset): if offset != None: self.offset = offset def set8(self, n, offset=None): if offset == None: offset = self.offset self.offset = offset + 1 self.msg[offset] = n & 0xff return self def getu8(self, offset=None): if offset == None: offset = self.offset self.offset = offset + 1 return self.msg[offset] def geti8(self, offset=None): x = self.getu8(offset) if (x >= 128): x = x - 256 return x def set16(self, n, offset=None): self.set8(n & 0xff, offset) self.set8((n >> 8) & 0xff) return self def getu16(self, offset=None): val = self.getu8(offset) val = val | self.getu8() return val def geti16(self, offset=None): x = self.getu16(offset) if (x >= 32768): x = x - 65536 return x def setstring(self, s, offset=None): self.setoffset(offset) for i in range(0, len(s)): self.set8(ord(s[i])) self.set8(0) def getstring(self, offset=None): self.setoffset(offset) chars = array('B') c = self.getu8() while c != 0: chars.append(c) c = self.getu8() return chars.tostring() def prt(self): for i in range(0, Message.MSG_SIZE): print '%02x' % self.msg[i], print
