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"""
Bacula and therefore Bareos specific implementation of a base64 decoder.
This class offers functions to handle this.
"""
class BareosBase64(object):
'''
Bacula and therefore Bareos specific implementation of a base64 decoder
'''
base64_digits = \
['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/']
def __init__(self):
'''
Initialize the Base 64 conversion routines
'''
self.base64_map = dict(list(zip(self.base64_digits, list(range(0, 64)))))
@staticmethod
def twos_comp(val, bits):
"""compute the 2's compliment of int value val"""
if (val&(1<<(bits-1))) != 0:
val = val - (1<<bits)
return val
def base64_to_int(self, base64):
'''
Convert the Base 64 characters in base64 to a value.
'''
value = 0
first = 0
neg = False
if base64[0] == '-':
neg = True
first = 1
for i in range(first, len(base64)):
value = value << 6
try:
value += self.base64_map[base64[i]]
except KeyError:
print("KeyError:", i)
return -value if neg else value
def int_to_base64(self, value):
"""
Convert an integer to base 64
"""
result = ""
if value < 0:
result = "-"
value = -value
while value:
charnumber = value % 0x3F
result += self.base64_digits[charnumber]
value = value >> 6
return result
def string_to_base64(self, string, compatible=False):
"""
Convert a string to base64
"""
buf = ""
reg = 0
rem = 0
char = 0
i = 0
while i < len(string):
if rem < 6:
reg <<= 8
char = string[i]
if not compatible:
if char >= 128:
char = self.twos_comp(char, 8)
reg |= char
i += 1
rem += 8
save = reg
reg >>= (rem - 6)
buf += self.base64_digits[reg & 0x3F]
reg = save
rem -= 6
if rem:
mask = (1 << rem) - 1
if compatible:
buf += self.base64_digits[(reg & mask) << (6 - rem)]
else:
buf += self.base64_digits[reg & mask]
return bytearray(buf, 'utf-8')
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