const CRC_TABLE: [[u8; 4]; 256] = [
[0x00, 0x00, 0x00, 0x00],
[0x77, 0x07, 0x30, 0x96],
[0xee, 0x0e, 0x61, 0x2c],
[0x99, 0x09, 0x51, 0xba],
[0x07, 0x6d, 0xc4, 0x19],
[0x70, 0x6a, 0xf4, 0x8f],
[0xe9, 0x63, 0xa5, 0x35],
[0x9e, 0x64, 0x95, 0xa3],
[0x0e, 0xdb, 0x88, 0x32],
[0x79, 0xdc, 0xb8, 0xa4],
[0xe0, 0xd5, 0xe9, 0x1e],
[0x97, 0xd2, 0xd9, 0x88],
[0x09, 0xb6, 0x4c, 0x2b],
[0x7e, 0xb1, 0x7c, 0xbd],
[0xe7, 0xb8, 0x2d, 0x07],
[0x90, 0xbf, 0x1d, 0x91],
[0x1d, 0xb7, 0x10, 0x64],
[0x6a, 0xb0, 0x20, 0xf2],
[0xf3, 0xb9, 0x71, 0x48],
[0x84, 0xbe, 0x41, 0xde],
[0x1a, 0xda, 0xd4, 0x7d],
[0x6d, 0xdd, 0xe4, 0xeb],
[0xf4, 0xd4, 0xb5, 0x51],
[0x83, 0xd3, 0x85, 0xc7],
[0x13, 0x6c, 0x98, 0x56],
[0x64, 0x6b, 0xa8, 0xc0],
[0xfd, 0x62, 0xf9, 0x7a],
[0x8a, 0x65, 0xc9, 0xec],
[0x14, 0x01, 0x5c, 0x4f],
[0x63, 0x06, 0x6c, 0xd9],
[0xfa, 0x0f, 0x3d, 0x63],
[0x8d, 0x08, 0x0d, 0xf5],
[0x3b, 0x6e, 0x20, 0xc8],
[0x4c, 0x69, 0x10, 0x5e],
[0xd5, 0x60, 0x41, 0xe4],
[0xa2, 0x67, 0x71, 0x72],
[0x3c, 0x03, 0xe4, 0xd1],
[0x4b, 0x04, 0xd4, 0x47],
[0xd2, 0x0d, 0x85, 0xfd],
[0xa5, 0x0a, 0xb5, 0x6b],
[0x35, 0xb5, 0xa8, 0xfa],
[0x42, 0xb2, 0x98, 0x6c],
[0xdb, 0xbb, 0xc9, 0xd6],
[0xac, 0xbc, 0xf9, 0x40],
[0x32, 0xd8, 0x6c, 0xe3],
[0x45, 0xdf, 0x5c, 0x75],
[0xdc, 0xd6, 0x0d, 0xcf],
[0xab, 0xd1, 0x3d, 0x59],
[0x26, 0xd9, 0x30, 0xac],
[0x51, 0xde, 0x00, 0x3a],
[0xc8, 0xd7, 0x51, 0x80],
[0xbf, 0xd0, 0x61, 0x16],
[0x21, 0xb4, 0xf4, 0xb5],
[0x56, 0xb3, 0xc4, 0x23],
[0xcf, 0xba, 0x95, 0x99],
[0xb8, 0xbd, 0xa5, 0x0f],
[0x28, 0x02, 0xb8, 0x9e],
[0x5f, 0x05, 0x88, 0x08],
[0xc6, 0x0c, 0xd9, 0xb2],
[0xb1, 0x0b, 0xe9, 0x24],
[0x2f, 0x6f, 0x7c, 0x87],
[0x58, 0x68, 0x4c, 0x11],
[0xc1, 0x61, 0x1d, 0xab],
[0xb6, 0x66, 0x2d, 0x3d],
[0x76, 0xdc, 0x41, 0x90],
[0x01, 0xdb, 0x71, 0x06],
[0x98, 0xd2, 0x20, 0xbc],
[0xef, 0xd5, 0x10, 0x2a],
[0x71, 0xb1, 0x85, 0x89],
[0x06, 0xb6, 0xb5, 0x1f],
[0x9f, 0xbf, 0xe4, 0xa5],
[0xe8, 0xb8, 0xd4, 0x33],
[0x78, 0x07, 0xc9, 0xa2],
[0x0f, 0x00, 0xf9, 0x34],
[0x96, 0x09, 0xa8, 0x8e],
[0xe1, 0x0e, 0x98, 0x18],
[0x7f, 0x6a, 0x0d, 0xbb],
[0x08, 0x6d, 0x3d, 0x2d],
[0x91, 0x64, 0x6c, 0x97],
[0xe6, 0x63, 0x5c, 0x01],
[0x6b, 0x6b, 0x51, 0xf4],
[0x1c, 0x6c, 0x61, 0x62],
[0x85, 0x65, 0x30, 0xd8],
[0xf2, 0x62, 0x00, 0x4e],
[0x6c, 0x06, 0x95, 0xed],
[0x1b, 0x01, 0xa5, 0x7b],
[0x82, 0x08, 0xf4, 0xc1],
[0xf5, 0x0f, 0xc4, 0x57],
[0x65, 0xb0, 0xd9, 0xc6],
[0x12, 0xb7, 0xe9, 0x50],
[0x8b, 0xbe, 0xb8, 0xea],
[0xfc, 0xb9, 0x88, 0x7c],
[0x62, 0xdd, 0x1d, 0xdf],
[0x15, 0xda, 0x2d, 0x49],
[0x8c, 0xd3, 0x7c, 0xf3],
[0xfb, 0xd4, 0x4c, 0x65],
[0x4d, 0xb2, 0x61, 0x58],
[0x3a, 0xb5, 0x51, 0xce],
[0xa3, 0xbc, 0x00, 0x74],
[0xd4, 0xbb, 0x30, 0xe2],
[0x4a, 0xdf, 0xa5, 0x41],
[0x3d, 0xd8, 0x95, 0xd7],
[0xa4, 0xd1, 0xc4, 0x6d],
[0xd3, 0xd6, 0xf4, 0xfb],
[0x43, 0x69, 0xe9, 0x6a],
[0x34, 0x6e, 0xd9, 0xfc],
[0xad, 0x67, 0x88, 0x46],
[0xda, 0x60, 0xb8, 0xd0],
[0x44, 0x04, 0x2d, 0x73],
[0x33, 0x03, 0x1d, 0xe5],
[0xaa, 0x0a, 0x4c, 0x5f],
[0xdd, 0x0d, 0x7c, 0xc9],
[0x50, 0x05, 0x71, 0x3c],
[0x27, 0x02, 0x41, 0xaa],
[0xbe, 0x0b, 0x10, 0x10],
[0xc9, 0x0c, 0x20, 0x86],
[0x57, 0x68, 0xb5, 0x25],
[0x20, 0x6f, 0x85, 0xb3],
[0xb9, 0x66, 0xd4, 0x09],
[0xce, 0x61, 0xe4, 0x9f],
[0x5e, 0xde, 0xf9, 0x0e],
[0x29, 0xd9, 0xc9, 0x98],
[0xb0, 0xd0, 0x98, 0x22],
[0xc7, 0xd7, 0xa8, 0xb4],
[0x59, 0xb3, 0x3d, 0x17],
[0x2e, 0xb4, 0x0d, 0x81],
[0xb7, 0xbd, 0x5c, 0x3b],
[0xc0, 0xba, 0x6c, 0xad],
[0xed, 0xb8, 0x83, 0x20],
[0x9a, 0xbf, 0xb3, 0xb6],
[0x03, 0xb6, 0xe2, 0x0c],
[0x74, 0xb1, 0xd2, 0x9a],
[0xea, 0xd5, 0x47, 0x39],
[0x9d, 0xd2, 0x77, 0xaf],
[0x04, 0xdb, 0x26, 0x15],
[0x73, 0xdc, 0x16, 0x83],
[0xe3, 0x63, 0x0b, 0x12],
[0x94, 0x64, 0x3b, 0x84],
[0x0d, 0x6d, 0x6a, 0x3e],
[0x7a, 0x6a, 0x5a, 0xa8],
[0xe4, 0x0e, 0xcf, 0x0b],
[0x93, 0x09, 0xff, 0x9d],
[0x0a, 0x00, 0xae, 0x27],
[0x7d, 0x07, 0x9e, 0xb1],
[0xf0, 0x0f, 0x93, 0x44],
[0x87, 0x08, 0xa3, 0xd2],
[0x1e, 0x01, 0xf2, 0x68],
[0x69, 0x06, 0xc2, 0xfe],
[0xf7, 0x62, 0x57, 0x5d],
[0x80, 0x65, 0x67, 0xcb],
[0x19, 0x6c, 0x36, 0x71],
[0x6e, 0x6b, 0x06, 0xe7],
[0xfe, 0xd4, 0x1b, 0x76],
[0x89, 0xd3, 0x2b, 0xe0],
[0x10, 0xda, 0x7a, 0x5a],
[0x67, 0xdd, 0x4a, 0xcc],
[0xf9, 0xb9, 0xdf, 0x6f],
[0x8e, 0xbe, 0xef, 0xf9],
[0x17, 0xb7, 0xbe, 0x43],
[0x60, 0xb0, 0x8e, 0xd5],
[0xd6, 0xd6, 0xa3, 0xe8],
[0xa1, 0xd1, 0x93, 0x7e],
[0x38, 0xd8, 0xc2, 0xc4],
[0x4f, 0xdf, 0xf2, 0x52],
[0xd1, 0xbb, 0x67, 0xf1],
[0xa6, 0xbc, 0x57, 0x67],
[0x3f, 0xb5, 0x06, 0xdd],
[0x48, 0xb2, 0x36, 0x4b],
[0xd8, 0x0d, 0x2b, 0xda],
[0xaf, 0x0a, 0x1b, 0x4c],
[0x36, 0x03, 0x4a, 0xf6],
[0x41, 0x04, 0x7a, 0x60],
[0xdf, 0x60, 0xef, 0xc3],
[0xa8, 0x67, 0xdf, 0x55],
[0x31, 0x6e, 0x8e, 0xef],
[0x46, 0x69, 0xbe, 0x79],
[0xcb, 0x61, 0xb3, 0x8c],
[0xbc, 0x66, 0x83, 0x1a],
[0x25, 0x6f, 0xd2, 0xa0],
[0x52, 0x68, 0xe2, 0x36],
[0xcc, 0x0c, 0x77, 0x95],
[0xbb, 0x0b, 0x47, 0x03],
[0x22, 0x02, 0x16, 0xb9],
[0x55, 0x05, 0x26, 0x2f],
[0xc5, 0xba, 0x3b, 0xbe],
[0xb2, 0xbd, 0x0b, 0x28],
[0x2b, 0xb4, 0x5a, 0x92],
[0x5c, 0xb3, 0x6a, 0x04],
[0xc2, 0xd7, 0xff, 0xa7],
[0xb5, 0xd0, 0xcf, 0x31],
[0x2c, 0xd9, 0x9e, 0x8b],
[0x5b, 0xde, 0xae, 0x1d],
[0x9b, 0x64, 0xc2, 0xb0],
[0xec, 0x63, 0xf2, 0x26],
[0x75, 0x6a, 0xa3, 0x9c],
[0x02, 0x6d, 0x93, 0x0a],
[0x9c, 0x09, 0x06, 0xa9],
[0xeb, 0x0e, 0x36, 0x3f],
[0x72, 0x07, 0x67, 0x85],
[0x05, 0x00, 0x57, 0x13],
[0x95, 0xbf, 0x4a, 0x82],
[0xe2, 0xb8, 0x7a, 0x14],
[0x7b, 0xb1, 0x2b, 0xae],
[0x0c, 0xb6, 0x1b, 0x38],
[0x92, 0xd2, 0x8e, 0x9b],
[0xe5, 0xd5, 0xbe, 0x0d],
[0x7c, 0xdc, 0xef, 0xb7],
[0x0b, 0xdb, 0xdf, 0x21],
[0x86, 0xd3, 0xd2, 0xd4],
[0xf1, 0xd4, 0xe2, 0x42],
[0x68, 0xdd, 0xb3, 0xf8],
[0x1f, 0xda, 0x83, 0x6e],
[0x81, 0xbe, 0x16, 0xcd],
[0xf6, 0xb9, 0x26, 0x5b],
[0x6f, 0xb0, 0x77, 0xe1],
[0x18, 0xb7, 0x47, 0x77],
[0x88, 0x08, 0x5a, 0xe6],
[0xff, 0x0f, 0x6a, 0x70],
[0x66, 0x06, 0x3b, 0xca],
[0x11, 0x01, 0x0b, 0x5c],
[0x8f, 0x65, 0x9e, 0xff],
[0xf8, 0x62, 0xae, 0x69],
[0x61, 0x6b, 0xff, 0xd3],
[0x16, 0x6c, 0xcf, 0x45],
[0xa0, 0x0a, 0xe2, 0x78],
[0xd7, 0x0d, 0xd2, 0xee],
[0x4e, 0x04, 0x83, 0x54],
[0x39, 0x03, 0xb3, 0xc2],
[0xa7, 0x67, 0x26, 0x61],
[0xd0, 0x60, 0x16, 0xf7],
[0x49, 0x69, 0x47, 0x4d],
[0x3e, 0x6e, 0x77, 0xdb],
[0xae, 0xd1, 0x6a, 0x4a],
[0xd9, 0xd6, 0x5a, 0xdc],
[0x40, 0xdf, 0x0b, 0x66],
[0x37, 0xd8, 0x3b, 0xf0],
[0xa9, 0xbc, 0xae, 0x53],
[0xde, 0xbb, 0x9e, 0xc5],
[0x47, 0xb2, 0xcf, 0x7f],
[0x30, 0xb5, 0xff, 0xe9],
[0xbd, 0xbd, 0xf2, 0x1c],
[0xca, 0xba, 0xc2, 0x8a],
[0x53, 0xb3, 0x93, 0x30],
[0x24, 0xb4, 0xa3, 0xa6],
[0xba, 0xd0, 0x36, 0x05],
[0xcd, 0xd7, 0x06, 0x93],
[0x54, 0xde, 0x57, 0x29],
[0x23, 0xd9, 0x67, 0xbf],
[0xb3, 0x66, 0x7a, 0x2e],
[0xc4, 0x61, 0x4a, 0xb8],
[0x5d, 0x68, 0x1b, 0x02],
[0x2a, 0x6f, 0x2b, 0x94],
[0xb4, 0x0b, 0xbe, 0x37],
[0xc3, 0x0c, 0x8e, 0xa1],
[0x5a, 0x05, 0xdf, 0x1b],
[0x2d, 0x02, 0xef, 0x8d],
];
#[derive(Debug, Clone, Copy)]
pub struct Crc([u8; 4]);
impl Crc {
pub fn new() -> Self {
Self([0xFF, 0xFF, 0xFF, 0xFF])
}
pub fn update(&mut self, buf: &[u8]) {
for byte in buf {
let a = (self.0[3] ^ *byte) as usize;
let b = [0x00, self.0[0], self.0[1], self.0[2]];
self.0 = [
CRC_TABLE[a][0] ^ b[0],
CRC_TABLE[a][1] ^ b[1],
CRC_TABLE[a][2] ^ b[2],
CRC_TABLE[a][3] ^ b[3],
];
}
}
pub fn checksum(&self) -> [u8; 4] {
[
self.0[0] ^ 0xFF,
self.0[1] ^ 0xFF,
self.0[2] ^ 0xFF,
self.0[3] ^ 0xFF,
]
}
}