| 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276 |
- var isStr = require('./isStr');
- var strToBytes = require('./strToBytes');
- var TABLE = [
- 0x00,
- 0x07,
- 0x0e,
- 0x09,
- 0x1c,
- 0x1b,
- 0x12,
- 0x15,
- 0x38,
- 0x3f,
- 0x36,
- 0x31,
- 0x24,
- 0x23,
- 0x2a,
- 0x2d,
- 0x70,
- 0x77,
- 0x7e,
- 0x79,
- 0x6c,
- 0x6b,
- 0x62,
- 0x65,
- 0x48,
- 0x4f,
- 0x46,
- 0x41,
- 0x54,
- 0x53,
- 0x5a,
- 0x5d,
- 0xe0,
- 0xe7,
- 0xee,
- 0xe9,
- 0xfc,
- 0xfb,
- 0xf2,
- 0xf5,
- 0xd8,
- 0xdf,
- 0xd6,
- 0xd1,
- 0xc4,
- 0xc3,
- 0xca,
- 0xcd,
- 0x90,
- 0x97,
- 0x9e,
- 0x99,
- 0x8c,
- 0x8b,
- 0x82,
- 0x85,
- 0xa8,
- 0xaf,
- 0xa6,
- 0xa1,
- 0xb4,
- 0xb3,
- 0xba,
- 0xbd,
- 0xc7,
- 0xc0,
- 0xc9,
- 0xce,
- 0xdb,
- 0xdc,
- 0xd5,
- 0xd2,
- 0xff,
- 0xf8,
- 0xf1,
- 0xf6,
- 0xe3,
- 0xe4,
- 0xed,
- 0xea,
- 0xb7,
- 0xb0,
- 0xb9,
- 0xbe,
- 0xab,
- 0xac,
- 0xa5,
- 0xa2,
- 0x8f,
- 0x88,
- 0x81,
- 0x86,
- 0x93,
- 0x94,
- 0x9d,
- 0x9a,
- 0x27,
- 0x20,
- 0x29,
- 0x2e,
- 0x3b,
- 0x3c,
- 0x35,
- 0x32,
- 0x1f,
- 0x18,
- 0x11,
- 0x16,
- 0x03,
- 0x04,
- 0x0d,
- 0x0a,
- 0x57,
- 0x50,
- 0x59,
- 0x5e,
- 0x4b,
- 0x4c,
- 0x45,
- 0x42,
- 0x6f,
- 0x68,
- 0x61,
- 0x66,
- 0x73,
- 0x74,
- 0x7d,
- 0x7a,
- 0x89,
- 0x8e,
- 0x87,
- 0x80,
- 0x95,
- 0x92,
- 0x9b,
- 0x9c,
- 0xb1,
- 0xb6,
- 0xbf,
- 0xb8,
- 0xad,
- 0xaa,
- 0xa3,
- 0xa4,
- 0xf9,
- 0xfe,
- 0xf7,
- 0xf0,
- 0xe5,
- 0xe2,
- 0xeb,
- 0xec,
- 0xc1,
- 0xc6,
- 0xcf,
- 0xc8,
- 0xdd,
- 0xda,
- 0xd3,
- 0xd4,
- 0x69,
- 0x6e,
- 0x67,
- 0x60,
- 0x75,
- 0x72,
- 0x7b,
- 0x7c,
- 0x51,
- 0x56,
- 0x5f,
- 0x58,
- 0x4d,
- 0x4a,
- 0x43,
- 0x44,
- 0x19,
- 0x1e,
- 0x17,
- 0x10,
- 0x05,
- 0x02,
- 0x0b,
- 0x0c,
- 0x21,
- 0x26,
- 0x2f,
- 0x28,
- 0x3d,
- 0x3a,
- 0x33,
- 0x34,
- 0x4e,
- 0x49,
- 0x40,
- 0x47,
- 0x52,
- 0x55,
- 0x5c,
- 0x5b,
- 0x76,
- 0x71,
- 0x78,
- 0x7f,
- 0x6a,
- 0x6d,
- 0x64,
- 0x63,
- 0x3e,
- 0x39,
- 0x30,
- 0x37,
- 0x22,
- 0x25,
- 0x2c,
- 0x2b,
- 0x06,
- 0x01,
- 0x08,
- 0x0f,
- 0x1a,
- 0x1d,
- 0x14,
- 0x13,
- 0xae,
- 0xa9,
- 0xa0,
- 0xa7,
- 0xb2,
- 0xb5,
- 0xbc,
- 0xbb,
- 0x96,
- 0x91,
- 0x98,
- 0x9f,
- 0x8a,
- 0x8d,
- 0x84,
- 0x83,
- 0xde,
- 0xd9,
- 0xd0,
- 0xd7,
- 0xc2,
- 0xc5,
- 0xcc,
- 0xcb,
- 0xe6,
- 0xe1,
- 0xe8,
- 0xef,
- 0xfa,
- 0xfd,
- 0xf4,
- 0xf3
- ];
- if (typeof Int32Array !== 'undefined') TABLE = new Int32Array(TABLE);
- exports = function(input, previous) {
- return exports.signed(input, previous) >>> 0;
- };
- exports.signed = function(input, previous) {
- if (isStr(input)) input = strToBytes(input);
- var crc = ~~previous;
- for (var i = 0, len = input.length; i < len; i++) {
- var byte = input[i];
- crc = TABLE[(crc ^ byte) & 0xff] & 0xff;
- }
- return crc;
- };
- module.exports = exports;
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