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