module M2TSParser::Appendix::CRC32Decoder
Constants
- CRC32_TABLE
Public Instance Methods
calc_crc32(bytes, length)
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# File lib/m2ts_parser/appendix/crc32.rb, line 56 def calc_crc32(bytes, length) crc = 0xffffffff length.times do |i| crc = ((crc << 8) & 0xffffffff) ^ CRC32_TABLE[((crc >> 24) ^ bytes[i]) & 0xff] end return crc end
check_crc32()
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# File lib/m2ts_parser/appendix/crc32.rb, line 64 def check_crc32 if structure_bit_length % 8 != 0 raise "binary's length should be multiple of 8bit to check CRC32." end return calc_crc32(to_chars, structure_bit_length / 8) == 0 end