@taichunmin/crc/lib/crc32q.ts

A cross platform alternative for calculating Cyclic Redundancy Checks (CRC) values.

import { setObject, u32 } from './common2'

const POLY_TABLE = new Uint32Array([
  0x00000000, 0x814141AB, 0x83C3C2FD, 0x02828356, 0x86C6C451, 0x078785FA, 0x050506AC, 0x84444707,
  0x8CCCC909, 0x0D8D88A2, 0x0F0F0BF4, 0x8E4E4A5F, 0x0A0A0D58, 0x8B4B4CF3, 0x89C9CFA5, 0x08888E0E,
  0x98D8D3B9, 0x19999212, 0x1B1B1144, 0x9A5A50EF, 0x1E1E17E8, 0x9F5F5643, 0x9DDDD515, 0x1C9C94BE,
  0x14141AB0, 0x95555B1B, 0x97D7D84D, 0x169699E6, 0x92D2DEE1, 0x13939F4A, 0x11111C1C, 0x90505DB7,
  0xB0F0E6D9, 0x31B1A772, 0x33332424, 0xB272658F, 0x36362288, 0xB7776323, 0xB5F5E075, 0x34B4A1DE,
  0x3C3C2FD0, 0xBD7D6E7B, 0xBFFFED2D, 0x3EBEAC86, 0xBAFAEB81, 0x3BBBAA2A, 0x3939297C, 0xB87868D7,
  0x28283560, 0xA96974CB, 0xABEBF79D, 0x2AAAB636, 0xAEEEF131, 0x2FAFB09A, 0x2D2D33CC, 0xAC6C7267,
  0xA4E4FC69, 0x25A5BDC2, 0x27273E94, 0xA6667F3F, 0x22223838, 0xA3637993, 0xA1E1FAC5, 0x20A0BB6E,
  0xE0A08C19, 0x61E1CDB2, 0x63634EE4, 0xE2220F4F, 0x66664848, 0xE72709E3, 0xE5A58AB5, 0x64E4CB1E,
  0x6C6C4510, 0xED2D04BB, 0xEFAF87ED, 0x6EEEC646, 0xEAAA8141, 0x6BEBC0EA, 0x696943BC, 0xE8280217,
  0x78785FA0, 0xF9391E0B, 0xFBBB9D5D, 0x7AFADCF6, 0xFEBE9BF1, 0x7FFFDA5A, 0x7D7D590C, 0xFC3C18A7,
  0xF4B496A9, 0x75F5D702, 0x77775454, 0xF63615FF, 0x727252F8, 0xF3331353, 0xF1B19005, 0x70F0D1AE,
  0x50506AC0, 0xD1112B6B, 0xD393A83D, 0x52D2E996, 0xD696AE91, 0x57D7EF3A, 0x55556C6C, 0xD4142DC7,
  0xDC9CA3C9, 0x5DDDE262, 0x5F5F6134, 0xDE1E209F, 0x5A5A6798, 0xDB1B2633, 0xD999A565, 0x58D8E4CE,
  0xC888B979, 0x49C9F8D2, 0x4B4B7B84, 0xCA0A3A2F, 0x4E4E7D28, 0xCF0F3C83, 0xCD8DBFD5, 0x4CCCFE7E,
  0x44447070, 0xC50531DB, 0xC787B28D, 0x46C6F326, 0xC282B421, 0x43C3F58A, 0x414176DC, 0xC0003777,
  0x40005999, 0xC1411832, 0xC3C39B64, 0x4282DACF, 0xC6C69DC8, 0x4787DC63, 0x45055F35, 0xC4441E9E,
  0xCCCC9090, 0x4D8DD13B, 0x4F0F526D, 0xCE4E13C6, 0x4A0A54C1, 0xCB4B156A, 0xC9C9963C, 0x4888D797,
  0xD8D88A20, 0x5999CB8B, 0x5B1B48DD, 0xDA5A0976, 0x5E1E4E71, 0xDF5F0FDA, 0xDDDD8C8C, 0x5C9CCD27,
  0x54144329, 0xD5550282, 0xD7D781D4, 0x5696C07F, 0xD2D28778, 0x5393C6D3, 0x51114585, 0xD050042E,
  0xF0F0BF40, 0x71B1FEEB, 0x73337DBD, 0xF2723C16, 0x76367B11, 0xF7773ABA, 0xF5F5B9EC, 0x74B4F847,
  0x7C3C7649, 0xFD7D37E2, 0xFFFFB4B4, 0x7EBEF51F, 0xFAFAB218, 0x7BBBF3B3, 0x793970E5, 0xF878314E,
  0x68286CF9, 0xE9692D52, 0xEBEBAE04, 0x6AAAEFAF, 0xEEEEA8A8, 0x6FAFE903, 0x6D2D6A55, 0xEC6C2BFE,
  0xE4E4A5F0, 0x65A5E45B, 0x6727670D, 0xE66626A6, 0x622261A1, 0xE363200A, 0xE1E1A35C, 0x60A0E2F7,
  0xA0A0D580, 0x21E1942B, 0x2363177D, 0xA22256D6, 0x266611D1, 0xA727507A, 0xA5A5D32C, 0x24E49287,
  0x2C6C1C89, 0xAD2D5D22, 0xAFAFDE74, 0x2EEE9FDF, 0xAAAAD8D8, 0x2BEB9973, 0x29691A25, 0xA8285B8E,
  0x38780639, 0xB9394792, 0xBBBBC4C4, 0x3AFA856F, 0xBEBEC268, 0x3FFF83C3, 0x3D7D0095, 0xBC3C413E,
  0xB4B4CF30, 0x35F58E9B, 0x37770DCD, 0xB6364C66, 0x32720B61, 0xB3334ACA, 0xB1B1C99C, 0x30F08837,
  0x10503359, 0x911172F2, 0x9393F1A4, 0x12D2B00F, 0x9696F708, 0x17D7B6A3, 0x155535F5, 0x9414745E,
  0x9C9CFA50, 0x1DDDBBFB, 0x1F5F38AD, 0x9E1E7906, 0x1A5A3E01, 0x9B1B7FAA, 0x9999FCFC, 0x18D8BD57,
  0x8888E0E0, 0x09C9A14B, 0x0B4B221D, 0x8A0A63B6, 0x0E4E24B1, 0x8F0F651A, 0x8D8DE64C, 0x0CCCA7E7,
  0x044429E9, 0x85056842, 0x8787EB14, 0x06C6AABF, 0x8282EDB8, 0x03C3AC13, 0x01412F45, 0x80006EEE,
])

/**
 * - poly: 0x814141AB
 * - initial: 0x00000000
 * - xorout: 0x00000000
 * - refin: false
 * - refout: false
 */
export default function crc32q (buf: Uint8Array = new Uint8Array(), prev: number = 0x00000000): number {
  u32[0] = prev
  for (const b of buf) u32[0] = POLY_TABLE[(u32[0] >>> 24) ^ b] ^ (u32[0] << 8)
  return u32[0]
}

setObject(globalThis, ['taichunmin', 'crc', 'crc32q'], crc32q)