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ECC.py
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class ECC:
parity = (
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0
)
DebugLevel=0
def CalcECC(self, body):
p8 = 0
p8_ = 0
p16 = 0
p16_ = 0
p32 = 0
p32_ = 0
p64 = 0
p64_ = 0
p128 = 0
p128_ = 0
p256 = 0
p256_ = 0
p512 = 0
p512_ = 0
p1024 = 0
p1024_ = 0
p2048 = 0
p2048_ = 0
p1 = 0
p1_ = 0
p2 = 0
p2_ = 0
p4 = 0
p4_ = 0
for i in range(0,len(body),1):
ch=ord(body[i])
bit0 = ch & 0x1
bit1 = (ch >> 1) & 0x1
bit2 = (ch >> 2) & 0x1
bit3 = (ch >> 3) & 0x1
bit4 = (ch >> 4) & 0x1
bit5 = (ch >> 5) & 0x1
bit6 = (ch >> 6) & 0x1
bit7 = (ch >> 7) & 0x1
xor_bit = bit7 ^ bit6 ^ bit5 ^ bit4 ^ bit3 ^ bit2 ^ bit1 ^ bit0
if self.DebugLevel>0:
print "%3x " % i, bit7, bit6, bit5, bit4, bit3, bit2, bit1, bit0
if i & 0x01 == 0x01:
p8 = xor_bit ^ p8
else:
p8_ = xor_bit ^ p8_
if i & 0x02 == 0x02:
p16 = xor_bit ^ p16
else:
p16_ = xor_bit ^ p16_
if i & 0x04 == 0x04:
p32 = xor_bit ^ p32
else:
p32_ = xor_bit ^ p32_
if i & 0x08 == 0x08:
p64 = xor_bit ^ p64
else:
p64_ = xor_bit ^ p64_
if i & 0x10 == 0x10:
p128 = xor_bit ^ p128
else:
p128_ = xor_bit ^ p128_
if i & 0x20 == 0x20:
p256 = xor_bit ^ p256
else:
p256_ = xor_bit ^ p256_
if i & 0x40 == 0x40:
p512 = xor_bit ^ p512
else:
p512_ = xor_bit ^ p512_
if i & 0x80 == 0x80:
p1024 = xor_bit ^ p1024
else:
p1024_ = xor_bit ^ p1024_
if i & 0x100 == 0x100:
p2048 = xor_bit ^ p2048
else:
p2048_ = xor_bit ^ p2048_
p1 = bit7 ^ bit5 ^ bit3 ^ bit1 ^ p1
p1_ = bit6 ^ bit4 ^ bit2 ^ bit0 ^ p1_
p2 = bit7 ^ bit6 ^ bit3 ^ bit2 ^ p2
p2_ = bit5 ^ bit4 ^ bit1 ^ bit0 ^ p2_
p4 = bit7 ^ bit6 ^ bit5 ^ bit4 ^ p4
p4_ = bit3 ^ bit2 ^ bit1 ^ bit0 ^ p4_
ecc0 = (p64 << 7) + (p64_ << 6) + (p32 << 5) + (p32_ << 4) + (p16 << 3) + (p16_ << 2) + (p8 << 1) + ( p8_ << 0)
ecc1 = (p1024 << 7) + (p1024_ << 6) + (p512 << 5) + (p512_ << 4) + (p256 << 3) + (p256_ << 2) + (p128 << 1) + (p128_<< 0)
ecc2 = (p4 << 7) + (p4_ << 6) + (p2 << 5) + (p2_ << 4) + (p1 << 3) + (p1_ << 2) + (p2048 << 1) + (p2048_ << 0)
return ( ecc0 ^ 0xff, ecc1 ^ 0xff, ecc2 ^ 0xff)
def CalcECC2(self, body):
par = 0
rp0 = 0
rp1 = 0
rp2 = 0
rp3 = 0
rp4 = 0
rp5 = 0
rp6 = 0
rp7 = 0
rp8 = 0
rp9 = 0
rp10 = 0
rp11 = 0
rp12 = 0
rp13 = 0
rp14 = 0
rp15 = 0
for i in range(0,len(body),1):
cur = ord(body[i])
par ^= cur
if i & 0x01:
rp1 ^= cur
else:
rp0 ^= cur
if i & 0x02:
rp3 ^= cur
else:
rp2 ^= cur
if i & 0x04:
rp5 ^= cur
else:
rp4 ^= cur
if i & 0x08:
rp7 ^= cur
else:
rp6 ^= cur
if i & 0x10:
rp9 ^= cur
else:
rp8 ^= cur
if i & 0x20:
rp11 ^= cur
else:
rp10 ^= cur
if i & 0x40:
rp13 ^= cur
else:
rp12 ^= cur
if i & 0x80:
rp15 ^= cur
else:
rp14 ^= cur
code0 = \
( self.Parity[rp7] << 7 ) | \
( self.Parity[rp6] << 6 ) | \
( self.Parity[rp5] << 5 ) | \
( self.Parity[rp4] << 4 ) | \
( self.Parity[rp3] << 3 ) | \
( self.Parity[rp2] << 2 ) | \
( self.Parity[rp1] << 1 ) | \
( self.Parity[rp0] << 0 )
code1 = \
( self.Parity[rp15] << 7 ) | \
( self.Parity[rp14] << 6 ) | \
( self.Parity[rp13] << 5 ) | \
( self.Parity[rp12] << 4 ) | \
( self.Parity[rp11] << 3 ) | \
( self.Parity[rp10] << 2 ) | \
( self.Parity[rp9] << 1 ) | \
( self.Parity[rp8] << 0 )
code2 = \
( self.Parity[par & 0xf0] << 7 ) | \
( self.Parity[par & 0x0f] << 6 ) | \
( self.Parity[par & 0xcc] << 5 ) | \
( self.Parity[par & 0x33] << 4 ) | \
( self.Parity[par & 0xaa] << 3 ) | \
( self.Parity[par & 0x55] << 2 )
code0 = ~code0
code1 = ~code1
code2 = ~code2
return (code0,code1,code2)