/
crc64.rb
122 lines (111 loc) · 6.55 KB
/
crc64.rb
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require 'digest/crc'
module Digest
#
# Implements the CRC64 algorithm.
#
class CRC64 < CRC
WIDTH = 64
INIT_CRC = 0x0000000000000000
XOR_MASK = 0x0000000000000000
# Generated by `./pycrc.py --algorithm=table-driven --model=crc-64 --generate=c`
TABLE = [
0x0000000000000000, 0x01b0000000000000, 0x0360000000000000, 0x02d0000000000000,
0x06c0000000000000, 0x0770000000000000, 0x05a0000000000000, 0x0410000000000000,
0x0d80000000000000, 0x0c30000000000000, 0x0ee0000000000000, 0x0f50000000000000,
0x0b40000000000000, 0x0af0000000000000, 0x0820000000000000, 0x0990000000000000,
0x1b00000000000000, 0x1ab0000000000000, 0x1860000000000000, 0x19d0000000000000,
0x1dc0000000000000, 0x1c70000000000000, 0x1ea0000000000000, 0x1f10000000000000,
0x1680000000000000, 0x1730000000000000, 0x15e0000000000000, 0x1450000000000000,
0x1040000000000000, 0x11f0000000000000, 0x1320000000000000, 0x1290000000000000,
0x3600000000000000, 0x37b0000000000000, 0x3560000000000000, 0x34d0000000000000,
0x30c0000000000000, 0x3170000000000000, 0x33a0000000000000, 0x3210000000000000,
0x3b80000000000000, 0x3a30000000000000, 0x38e0000000000000, 0x3950000000000000,
0x3d40000000000000, 0x3cf0000000000000, 0x3e20000000000000, 0x3f90000000000000,
0x2d00000000000000, 0x2cb0000000000000, 0x2e60000000000000, 0x2fd0000000000000,
0x2bc0000000000000, 0x2a70000000000000, 0x28a0000000000000, 0x2910000000000000,
0x2080000000000000, 0x2130000000000000, 0x23e0000000000000, 0x2250000000000000,
0x2640000000000000, 0x27f0000000000000, 0x2520000000000000, 0x2490000000000000,
0x6c00000000000000, 0x6db0000000000000, 0x6f60000000000000, 0x6ed0000000000000,
0x6ac0000000000000, 0x6b70000000000000, 0x69a0000000000000, 0x6810000000000000,
0x6180000000000000, 0x6030000000000000, 0x62e0000000000000, 0x6350000000000000,
0x6740000000000000, 0x66f0000000000000, 0x6420000000000000, 0x6590000000000000,
0x7700000000000000, 0x76b0000000000000, 0x7460000000000000, 0x75d0000000000000,
0x71c0000000000000, 0x7070000000000000, 0x72a0000000000000, 0x7310000000000000,
0x7a80000000000000, 0x7b30000000000000, 0x79e0000000000000, 0x7850000000000000,
0x7c40000000000000, 0x7df0000000000000, 0x7f20000000000000, 0x7e90000000000000,
0x5a00000000000000, 0x5bb0000000000000, 0x5960000000000000, 0x58d0000000000000,
0x5cc0000000000000, 0x5d70000000000000, 0x5fa0000000000000, 0x5e10000000000000,
0x5780000000000000, 0x5630000000000000, 0x54e0000000000000, 0x5550000000000000,
0x5140000000000000, 0x50f0000000000000, 0x5220000000000000, 0x5390000000000000,
0x4100000000000000, 0x40b0000000000000, 0x4260000000000000, 0x43d0000000000000,
0x47c0000000000000, 0x4670000000000000, 0x44a0000000000000, 0x4510000000000000,
0x4c80000000000000, 0x4d30000000000000, 0x4fe0000000000000, 0x4e50000000000000,
0x4a40000000000000, 0x4bf0000000000000, 0x4920000000000000, 0x4890000000000000,
0xd800000000000000, 0xd9b0000000000000, 0xdb60000000000000, 0xdad0000000000000,
0xdec0000000000000, 0xdf70000000000000, 0xdda0000000000000, 0xdc10000000000000,
0xd580000000000000, 0xd430000000000000, 0xd6e0000000000000, 0xd750000000000000,
0xd340000000000000, 0xd2f0000000000000, 0xd020000000000000, 0xd190000000000000,
0xc300000000000000, 0xc2b0000000000000, 0xc060000000000000, 0xc1d0000000000000,
0xc5c0000000000000, 0xc470000000000000, 0xc6a0000000000000, 0xc710000000000000,
0xce80000000000000, 0xcf30000000000000, 0xcde0000000000000, 0xcc50000000000000,
0xc840000000000000, 0xc9f0000000000000, 0xcb20000000000000, 0xca90000000000000,
0xee00000000000000, 0xefb0000000000000, 0xed60000000000000, 0xecd0000000000000,
0xe8c0000000000000, 0xe970000000000000, 0xeba0000000000000, 0xea10000000000000,
0xe380000000000000, 0xe230000000000000, 0xe0e0000000000000, 0xe150000000000000,
0xe540000000000000, 0xe4f0000000000000, 0xe620000000000000, 0xe790000000000000,
0xf500000000000000, 0xf4b0000000000000, 0xf660000000000000, 0xf7d0000000000000,
0xf3c0000000000000, 0xf270000000000000, 0xf0a0000000000000, 0xf110000000000000,
0xf880000000000000, 0xf930000000000000, 0xfbe0000000000000, 0xfa50000000000000,
0xfe40000000000000, 0xfff0000000000000, 0xfd20000000000000, 0xfc90000000000000,
0xb400000000000000, 0xb5b0000000000000, 0xb760000000000000, 0xb6d0000000000000,
0xb2c0000000000000, 0xb370000000000000, 0xb1a0000000000000, 0xb010000000000000,
0xb980000000000000, 0xb830000000000000, 0xbae0000000000000, 0xbb50000000000000,
0xbf40000000000000, 0xbef0000000000000, 0xbc20000000000000, 0xbd90000000000000,
0xaf00000000000000, 0xaeb0000000000000, 0xac60000000000000, 0xadd0000000000000,
0xa9c0000000000000, 0xa870000000000000, 0xaaa0000000000000, 0xab10000000000000,
0xa280000000000000, 0xa330000000000000, 0xa1e0000000000000, 0xa050000000000000,
0xa440000000000000, 0xa5f0000000000000, 0xa720000000000000, 0xa690000000000000,
0x8200000000000000, 0x83b0000000000000, 0x8160000000000000, 0x80d0000000000000,
0x84c0000000000000, 0x8570000000000000, 0x87a0000000000000, 0x8610000000000000,
0x8f80000000000000, 0x8e30000000000000, 0x8ce0000000000000, 0x8d50000000000000,
0x8940000000000000, 0x88f0000000000000, 0x8a20000000000000, 0x8b90000000000000,
0x9900000000000000, 0x98b0000000000000, 0x9a60000000000000, 0x9bd0000000000000,
0x9fc0000000000000, 0x9e70000000000000, 0x9ca0000000000000, 0x9d10000000000000,
0x9480000000000000, 0x9530000000000000, 0x97e0000000000000, 0x9650000000000000,
0x9240000000000000, 0x93f0000000000000, 0x9120000000000000, 0x9090000000000000
].freeze
#
# Packs the CRC64 checksum.
#
# @param [Integer] crc
# The checksum to pack.
#
# @return [String]
# The packed checksum.
#
def self.pack(crc)
buffer = ''
buffer << ((crc & 0xff00000000000000) >> 56).chr
buffer << ((crc & 0xff000000000000) >> 48).chr
buffer << ((crc & 0xff0000000000) >> 40).chr
buffer << ((crc & 0xff00000000) >> 32).chr
buffer << ((crc & 0xff000000) >> 24).chr
buffer << ((crc & 0xff0000) >> 16).chr
buffer << ((crc & 0xff00) >> 8).chr
buffer << (crc & 0xff).chr
buffer
end
#
# Updates the CRC64 checksum.
#
# @param [String] data
# The data to update the checksum with.
#
def update(data)
data.each_byte do |b|
@crc = ((@table[(@crc ^ b) & 0xff] ^ (@crc >> 8)) & 0xffffffffffffffff)
end
return self
end
end
end