base64编码-Python-创新互联
# base64解码
class Decoder(object):
tables = None
def __init__(self):
self.__generateCodeTable()
def __generateCodeTable(self):
"""
解码的码表
"""
codeTable = {}
# ord(ss) 输出字符的ascii
# chr(num) 输出数值对应的字符
init_char = ord('A') - 1
for i in range(26):
init_char = chr(init_char + 1)
codeTable[init_char] = i
init_char = ord('a') - 1
for j in range(26,52):
init_char = chr(init_char + 1)
codeTable[init_char] = j
init_char = ord('0') -1
for k in range(52,62):
init_char = chr(init_char + 1)
codeTable[init_char] = k
codeTable['+'] = 62
codeTable['/'] = 63
self.tables = codeTable
def __characterTo6Bin(self,msg):
"""
将每个字符串转化为6位的二进制
"""
result = ''
for i in range(len(msg)):
tep_str = ''
tmp = bin(self.tables.get(msg[i]))[2:]
if len(tmp) < 6 :
num = 6 - len(tmp)
for j in range(num):
tep_str += '0'
tep_str += tmp
result += tep_str
return result
def decode(self,msg):
"""
解码base64编码的字符
"""
index = msg.find('=')
if index != -1:
msg = msg[0:index]
result = []
str_bin = self.__characterTo6Bin(msg)
length = len(str_bin)
index = 0
while index < length:
if int(str_bin[index:index+8],2) > 127:
tmp = str_bin[index:index+24]
hex_str = str(hex(int(tmp,2)))
hex_str = hex_str.replace('0x','')
result.append(str(bytes.fromhex(hex_str),encoding='utf-8'))
index += 24
else:
sub = str_bin[index:index+8]
result.append(chr(int(sub,2)))
index += 8
if result[-1] == 0:
result = result[0:-1]
origin = ""
for key in result:
origin += key
return origin.replace('\x00','')
decode = Decoder()
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