crc.php

<?php
    namespace xenocrat;

    class crc {
        const CRC_VERSION_MAJOR        = 2;
        const CRC_VERSION_MINOR        = 2;

        const CRC_CHECK_DATA           = "123456789";

        const CRC8_AUTOSAR_CHECK       = 0xdf;
        const CRC8_BLUETOOTH_CHECK     = 0x26;
        const CRC8_CDMA2000_CHECK      = 0xda;
        const CRC8_DARC_CHECK          = 0x15;
        const CRC8_DVB_S2_CHECK        = 0xbc;
        const CRC8_GSM_A_CHECK         = 0x37;
        const CRC8_GSM_B_CHECK         = 0x94;
        const CRC8_HITAG_CHECK         = 0xb4;
        const CRC8_I_432_1_CHECK       = 0xa1;
        const CRC8_I_CODE_CHECK        = 0x7e;
        const CRC8_LTE_CHECK           = 0xea;
        const CRC8_MAXIM_DOW_CHECK     = 0xa1;
        const CRC8_MIFARE_MAD_CHECK    = 0x99;
        const CRC8_NRSC_5_CHECK        = 0xf7;
        const CRC8_OPENSAFETY_CHECK    = 0x3e;
        const CRC8_ROHC_CHECK          = 0xd0;
        const CRC8_SAE_J1850_CHECK     = 0x4b;
        const CRC8_SMBUS_CHECK         = 0xf4;
        const CRC8_TECH_3250_CHECK     = 0x97;
        const CRC8_WCDMA_CHECK         = 0x25;

        const CRC16_A_CHECK            = 0xbf05;
        const CRC16_ARC_CHECK          = 0xbb3d;
        const CRC16_CDMA2000_CHECK     = 0x4c06;
        const CRC16_CMS_CHECK          = 0xaee7;
        const CRC16_DDS_110_CHECK      = 0x9ecf;
        const CRC16_DECT_R_CHECK       = 0x007e;
        const CRC16_DECT_X_CHECK       = 0x007f;
        const CRC16_DNP_CHECK          = 0xea82;
        const CRC16_EN_13757_CHECK     = 0xc2b7;
        const CRC16_GENIBUS_CHECK      = 0xd64e;
        const CRC16_GSM_CHECK          = 0xce3c;
        const CRC16_IBM_3740_CHECK     = 0x29b1;
        const CRC16_IBM_SDLC_CHECK     = 0x906e;
        const CRC16_KERMIT_CHECK       = 0x2189;
        const CRC16_LJ1200_CHECK       = 0xbdf4;
        const CRC16_M17_CHECK          = 0x772b;
        const CRC16_MAXIM_DOW_CHECK    = 0x44c2;
        const CRC16_MCRF4XX_CHECK      = 0x6f91;
        const CRC16_MODBUS_CHECK       = 0x4b37;
        const CRC16_NRSC_5_CHECK       = 0xa066;
        const CRC16_OPENSAFETY_A_CHECK = 0x5d38;
        const CRC16_OPENSAFETY_B_CHECK = 0x20fe;
        const CRC16_PROFIBUS_CHECK     = 0xa819;
        const CRC16_RIELLO_CHECK       = 0x63d0;
        const CRC16_SPI_FUJITSU_CHECK  = 0xe5cc;
        const CRC16_T10_DIF_CHECK      = 0xd0db;
        const CRC16_TELEDISK_CHECK     = 0x0fb3;
        const CRC16_TMS37157_CHECK     = 0x26b1;
        const CRC16_UMTS_CHECK         = 0xfee8;
        const CRC16_USB_CHECK          = 0xb4c8;
        const CRC16_XMODEM_CHECK       = 0x31c3;

        const CRC24_BLE_CHECK          = 0xc25a56;
        const CRC24_FLEXRAY_A_CHECK    = 0x7979bd;
        const CRC24_FLEXRAY_B_CHECK    = 0x1f23b8;
        const CRC24_INTERLAKEN_CHECK   = 0xb4f3e6;
        const CRC24_LTE_A_CHECK        = 0xcde703;
        const CRC24_LTE_B_CHECK        = 0x23ef52;
        const CRC24_OPENPGP_CHECK      = 0x21cf02;
        const CRC24_OS_9_CHECK         = 0x200fa5;

        const CRC32_AIXM_CHECK         = 0x3010bf7f;
        const CRC32_AUTOSAR_CHECK      = 0x1697d06a;
        const CRC32_BASE91_D_CHECK     = 0x87315576;
        const CRC32_BZIP2_CHECK        = 0xfc891918;
        const CRC32_CD_ROM_EDC_CHECK   = 0x6ec2edc4;
        const CRC32_CKSUM_CHECK        = 0x765e7680;
        const CRC32_ISCSI_CHECK        = 0xe3069283;
        const CRC32_ISO_HDLC_CHECK     = 0xcbf43926;
        const CRC32_JAMCRC_CHECK       = 0x340bc6d9;
        const CRC32_MEF_CHECK          = 0xd2c22f51;
        const CRC32_MPEG_2_CHECK       = 0x0376e6e7;
        const CRC32_XFER_CHECK         = 0xbd0be338;

        const CRC64_ECMA_182_CHECK     = "6c40df5f0b497347";
        const CRC64_GO_ISO_CHECK       = "b90956c775a41001";
        const CRC64_MS_CHECK           = "75d4b74f024eceea";
        const CRC64_WE_CHECK           = "62ec59e3f1a4f00a";
        const CRC64_XZ_CHECK           = "995dc9bbdf1939fa";

        /* CRC-8/AUTOSAR */
        public static function crc8_autosar($str): int {
            return self::crc8(
                str:$str,
                polynomial:0x2f,
                ini:0xff,
                xor:0xff,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-8/BLUETOOTH */
        public static function crc8_bluetooth($str): int {
            return self::crc8(
                str:$str,
                polynomial:0xa7,
                ini:0x00,
                xor:0x00,
                ref_in:true,
                ref_out:true
            );
        }

        /* CRC-8/CDMA2000 */
        public static function crc8_cdma2000($str): int {
            return self::crc8(
                str:$str,
                polynomial:0x9b,
                ini:0xff,
                xor:0x00,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-8/DARC */
        public static function crc8_darc($str): int {
            return self::crc8(
                str:$str,
                polynomial:0x39,
                ini:0x00,
                xor:0x00,
                ref_in:true,
                ref_out:true
            );
        }

        /* CRC-8/DVB-S2 */
        public static function crc8_dvb_s2($str): int {
            return self::crc8(
                str:$str,
                polynomial:0xd5,
                ini:0x00,
                xor:0x00,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-8/GSM-A */
        public static function crc8_gsm_a($str): int {
            return self::crc8(
                str:$str,
                polynomial:0x1d,
                ini:0x00,
                xor:0x00,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-8/GSM-B */
        public static function crc8_gsm_b($str): int {
            return self::crc8(
                str:$str,
                polynomial:0x49,
                ini:0x00,
                xor:0xff,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-8/HITAG */
        public static function crc8_hitag($str): int {
            return self::crc8(
                str:$str,
                polynomial:0x1d,
                ini:0xff,
                xor:0x00,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-8/I-432-1 */
        public static function crc8_i_432_1($str): int {
            return self::crc8(
                str:$str,
                polynomial:0x07,
                ini:0x00,
                xor:0x55,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-8/I-CODE */
        public static function crc8_i_code($str): int {
            return self::crc8(
                str:$str,
                polynomial:0x1d,
                ini:0xfd,
                xor:0x00,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-8/LTE */
        public static function crc8_lte($str): int {
            return self::crc8(
                str:$str,
                polynomial:0x9b,
                ini:0x00,
                xor:0x00,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-8/MAXIM-DOW */
        public static function crc8_maxim_dow($str): int {
            return self::crc8(
                str:$str,
                polynomial:0x31,
                ini:0x00,
                xor:0x00,
                ref_in:true,
                ref_out:true
            );
        }

        /* CRC-8/MIFARE-MAD */
        public static function crc8_mifare_mad($str): int {
            return self::crc8(
                str:$str,
                polynomial:0x1d,
                ini:0xc7,
                xor:0x00,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-8/NRSC-5 */
        public static function crc8_nrsc_5($str): int {
            return self::crc8(
                str:$str,
                polynomial:0x31,
                ini:0xff,
                xor:0x00,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-8/OPENSAFETY */
        public static function crc8_opensafety($str): int {
            return self::crc8(
                str:$str,
                polynomial:0x2f,
                ini:0x00,
                xor:0x00,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-8/ROHC */
        public static function crc8_rohc($str): int {
            return self::crc8(
                str:$str,
                polynomial:0x07,
                ini:0xff,
                xor:0x00,
                ref_in:true,
                ref_out:true
            );
        }

        /* CRC-8/SAE-J1850 */
        public static function crc8_sae_j1850($str): int {
            return self::crc8(
                str:$str,
                polynomial:0x1d,
                ini:0xff,
                xor:0xff,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-8/SMBUS */
        public static function crc8_smbus($str): int {
            return self::crc8(
                str:$str,
                polynomial:0x07,
                ini:0x00,
                xor:0x00,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-8/TECH-3250 */
        public static function crc8_tech_3250($str): int {
            return self::crc8(
                str:$str,
                polynomial:0x1d,
                ini:0xff,
                xor:0x00,
                ref_in:true,
                ref_out:true
            );
        }

        /* CRC-8/WCDMA */
        public static function crc8_wcdma($str): int {
            return self::crc8(
                str:$str,
                polynomial:0x9b,
                ini:0x00,
                xor:0x00,
                ref_in:true,
                ref_out:true
            );
        }

        /* CRC-16/ISO-IEC-14443-3-A */
        public static function crc16_a($str): int {
            return self::crc16(
                str:$str,
                polynomial:0x1021,
                ini:0xc6c6,
                xor:0x0000,
                ref_in:true,
                ref_out:true
            );
        }

        /* CRC-16/ARC */
        public static function crc16_arc($str): int {
            return self::crc16(
                str:$str,
                polynomial:0x8005,
                ini:0x0000,
                xor:0x0000,
                ref_in:true,
                ref_out:true
            );
        }

        /* CRC-16/CDMA2000 */
        public static function crc16_cdma2000($str): int {
            return self::crc16(
                str:$str,
                polynomial:0xc867,
                ini:0xffff,
                xor:0x0000,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-16/CMS */
        public static function crc16_cms($str): int {
            return self::crc16(
                str:$str,
                polynomial:0x8005,
                ini:0xffff,
                xor:0x0000,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-16/DDS-110 */
        public static function crc16_dds_110($str): int {
            return self::crc16(
                str:$str,
                polynomial:0x8005,
                ini:0x800d,
                xor:0x0000,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-16/DECT-R */
        public static function crc16_dect_r($str): int {
            return self::crc16(
                str:$str,
                polynomial:0x0589,
                ini:0x0000,
                xor:0x0001,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-16/DECT-X */
        public static function crc16_dect_x($str): int {
            return self::crc16(
                str:$str,
                polynomial:0x0589,
                ini:0x0000,
                xor:0x0000,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-16/DNP */
        public static function crc16_dnp($str): int {
            return self::crc16(
                str:$str,
                polynomial:0x3d65,
                ini:0x0000,
                xor:0xffff,
                ref_in:true,
                ref_out:true
            );
        }

        /* CRC-16/EN-13757 */
        public static function crc16_en_13757($str): int {
            return self::crc16(
                str:$str,
                polynomial:0x3d65,
                ini:0x0000,
                xor:0xffff,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-16/GENIBUS */
        public static function crc16_genibus($str): int {
            return self::crc16(
                str:$str,
                polynomial:0x1021,
                ini:0xffff,
                xor:0xffff,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-16/GSM */
        public static function crc16_gsm($str): int {
            return self::crc16(
                str:$str,
                polynomial:0x1021,
                ini:0x0000,
                xor:0xffff,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-16/IBM-3740 */
        public static function crc16_ibm_3740($str): int {
            return self::crc16(
                str:$str,
                polynomial:0x1021,
                ini:0xffff,
                xor:0x0000,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-16/IBM-SDLC */
        public static function crc16_ibm_sdlc($str): int {
            return self::crc16(
                str:$str,
                polynomial:0x1021,
                ini:0xffff,
                xor:0xffff,
                ref_in:true,
                ref_out:true
            );
        }

        /* CRC-16/KERMIT */
        public static function crc16_kermit($str): int {
            return self::crc16(
                str:$str,
                polynomial:0x1021,
                ini:0x0000,
                xor:0x0000,
                ref_in:true,
                ref_out:true
            );
        }

        /* CRC-16/LJ1200 */
        public static function crc16_lj1200($str): int {
            return self::crc16(
                str:$str,
                polynomial:0x6f63,
                ini:0x0000,
                xor:0x0000,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-16/M17 */
        public static function crc16_m17($str): int {
            return self::crc16(
                str:$str,
                polynomial:0x5935,
                ini:0xffff,
                xor:0x0000,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-16/MAXIM-DOW */
        public static function crc16_maxim_dow($str): int {
            return self::crc16(
                str:$str,
                polynomial:0x8005,
                ini:0x0000,
                xor:0xffff,
                ref_in:true,
                ref_out:true
            );
        }

        /* CRC-16/MCRF4XX */
        public static function crc16_mcrf4xx($str): int {
            return self::crc16(
                str:$str,
                polynomial:0x1021,
                ini:0xffff,
                xor:0x0000,
                ref_in:true,
                ref_out:true
            );
        }

        /* CRC-16/MODBUS */
        public static function crc16_modbus($str): int {
            return self::crc16(
                str:$str,
                polynomial:0x8005,
                ini:0xffff,
                xor:0x0000,
                ref_in:true,
                ref_out:true
            );
        }

        /* CRC-16/NRSC-5 */
        public static function crc16_nrsc_5($str): int {
            return self::crc16(
                str:$str,
                polynomial:0x080b,
                ini:0xffff,
                xor:0x0000,
                ref_in:true,
                ref_out:true
            );
        }

        /* CRC-16/OPENSAFETY-A */
        public static function crc16_opensafety_a($str): int {
            return self::crc16(
                str:$str,
                polynomial:0x5935,
                ini:0x0000,
                xor:0x0000,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-16/OPENSAFETY-B */
        public static function crc16_opensafety_b($str): int {
            return self::crc16(
                str:$str,
                polynomial:0x755b,
                ini:0x0000,
                xor:0x0000,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-16/PROFIBUS */
        public static function crc16_profibus($str): int {
            return self::crc16(
                str:$str,
                polynomial:0x1dcf,
                ini:0xffff,
                xor:0xffff,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-16/RIELLO */
        public static function crc16_riello($str): int {
            return self::crc16(
                str:$str,
                polynomial:0x1021,
                ini:0xb2aa,
                xor:0x0000,
                ref_in:true,
                ref_out:true
            );
        }

        /* CRC-16/SPI-FUJITSU */
        public static function crc16_spi_fujitsu($str): int {
            return self::crc16(
                str:$str,
                polynomial:0x1021,
                ini:0x1d0f,
                xor:0x0000,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-16/T10-DIF */
        public static function crc16_t10_dif($str): int {
            return self::crc16(
                str:$str,
                polynomial:0x8bb7,
                ini:0x0000,
                xor:0x0000,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-16/TELEDISK */
        public static function crc16_teledisk($str): int {
            return self::crc16(
                str:$str,
                polynomial:0xa097,
                ini:0x0000,
                xor:0x0000,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-16/TMS37157 */
        public static function crc16_tms37157($str): int {
            return self::crc16(
                str:$str,
                polynomial:0x1021,
                ini:0x89ec,
                xor:0x0000,
                ref_in:true,
                ref_out:true
            );
        }

        /* CRC-16/UMTS */
        public static function crc16_umts($str): int {
            return self::crc16(
                str:$str,
                polynomial:0x8005,
                ini:0x0000,
                xor:0x0000,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-16/USB */
        public static function crc16_usb($str): int {
            return self::crc16(
                str:$str,
                polynomial:0x8005,
                ini:0xffff,
                xor:0xffff,
                ref_in:true,
                ref_out:true
            );
        }

        /* CRC-16/XMODEM */
        public static function crc16_xmodem($str): int {
            return self::crc16(
                str:$str,
                polynomial:0x1021,
                ini:0x0000,
                xor:0x0000,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-24/BLE */
        public static function crc24_ble($str): int {
            return self::crc24(
                str:$str,
                polynomial:0x00065b,
                ini:0x555555,
                xor:0x000000,
                ref_in:true,
                ref_out:true
            );
        }

        /* CRC-24/FLEXRAY-A */
        public static function crc24_flexray_a($str): int {
            return self::crc24(
                str:$str,
                polynomial:0x5d6dcb,
                ini:0xfedcba,
                xor:0x000000,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-24/FLEXRAY-B */
        public static function crc24_flexray_b($str): int {
            return self::crc24(
                str:$str,
                polynomial:0x5d6dcb,
                ini:0xabcdef,
                xor:0x000000,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-24/INTERLAKEN */
        public static function crc24_interlaken($str): int {
            return self::crc24(
                str:$str,
                polynomial:0x328b63,
                ini:0xffffff,
                xor:0xffffff,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-24/LTE-A */
        public static function crc24_lte_a($str): int {
            return self::crc24(
                str:$str,
                polynomial:0x864cfb,
                ini:0x000000,
                xor:0x000000,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-24/LTE-B */
        public static function crc24_lte_b($str): int {
            return self::crc24(
                str:$str,
                polynomial:0x800063,
                ini:0x000000,
                xor:0x000000,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-24/OPENPGP */
        public static function crc24_openpgp($str): int {
            return self::crc24(
                str:$str,
                polynomial:0x864cfb,
                ini:0xb704ce,
                xor:0x000000,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-24/OS-9 */
        public static function crc24_os_9($str): int {
            return self::crc24(
                str:$str,
                polynomial:0x800063,
                ini:0xffffff,
                xor:0xffffff,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-32/AIXM */
        public static function crc32_aixm($str): int {
            return self::crc32(
                str:$str,
                polynomial:0x814141ab,
                ini:0x00000000,
                xor:0x00000000,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-32/AUTOSAR */
        public static function crc32_autosar($str): int {
            return self::crc32(
                str:$str,
                polynomial:0xf4acfb13,
                ini:0xffffffff,
                xor:0xffffffff,
                ref_in:true,
                ref_out:true
            );
        }

        /* CRC-32/BASE91-D */
        public static function crc32_base91_d($str): int {
            return self::crc32(
                str:$str,
                polynomial:0xa833982b,
                ini:0xffffffff,
                xor:0xffffffff,
                ref_in:true,
                ref_out:true
            );
        }

        /* CRC-32/BZIP2 */
        public static function crc32_bzip2($str): int {
            return self::crc32(
                str:$str,
                polynomial:0x04c11db7,
                ini:0xffffffff,
                xor:0xffffffff,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-32/CD-ROM-EDC */
        public static function crc32_cd_rom_edc($str): int {
            return self::crc32(
                str:$str,
                polynomial:0x8001801b,
                ini:0x00000000,
                xor:0x00000000,
                ref_in:true,
                ref_out:true
            );
        }

        /* CRC-32/CKSUM */
        public static function crc32_cksum($str): int {
            return self::crc32(
                str:$str,
                polynomial:0x04c11db7,
                ini:0x00000000,
                xor:0xffffffff,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-32/ISCSI */
        public static function crc32_iscsi($str): int {
            return self::crc32(
                str:$str,
                polynomial:0x1edc6f41,
                ini:0xffffffff,
                xor:0xffffffff,
                ref_in:true,
                ref_out:true
            );
        }

        /* CRC-32/ISO-HDLC */
        public static function crc32_iso_hdlc($str): int {
            return self::crc32(
                str:$str,
                polynomial:0x04c11db7,
                ini:0xffffffff,
                xor:0xffffffff,
                ref_in:true,
                ref_out:true
            );
        }

        /* CRC-32/JAMCRC */
        public static function crc32_jamcrc($str): int {
            return self::crc32(
                str:$str,
                polynomial:0x04c11db7,
                ini:0xffffffff,
                xor:0x00000000,
                ref_in:true,
                ref_out:true
            );
        }

        /* CRC-32/MEF */
        public static function crc32_mef($str): int {
            return self::crc32(
                str:$str,
                polynomial:0x741b8cd7,
                ini:0xffffffff,
                xor:0x00000000,
                ref_in:true,
                ref_out:true
            );
        }

        /* CRC-32/MPEG-2 */
        public static function crc32_mpeg_2($str): int {
            return self::crc32(
                str:$str,
                polynomial:0x04c11db7,
                ini:0xffffffff,
                xor:0x00000000,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-32/XFER */
        public static function crc32_xfer($str): int {
            return self::crc32(
                str:$str,
                polynomial:0x000000af,
                ini:0x00000000,
                xor:0x00000000,
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-64/ECMA-182 */
        public static function crc64_ecma_182($str): int {
            return self::crc64(
                str:$str,
                polynomial:"42f0e1eba9ea3693",
                ini:"0000000000000000",
                xor:"0000000000000000",
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-64/GO-ISO */
        public static function crc64_go_iso($str): int {
            return self::crc64(
                str:$str,
                polynomial:"000000000000001b",
                ini:"ffffffffffffffff",
                xor:"ffffffffffffffff",
                ref_in:true,
                ref_out:true
            );
        }

        /* CRC-64/MS */
        public static function crc64_ms($str): int {
            return self::crc64(
                str:$str,
                polynomial:"259c84cba6426349",
                ini:"ffffffffffffffff",
                xor:"0000000000000000",
                ref_in:true,
                ref_out:true
            );
        }

        /* CRC-64/WE */
        public static function crc64_we($str): int {
            return self::crc64(
                str:$str,
                polynomial:"42f0e1eba9ea3693",
                ini:"ffffffffffffffff",
                xor:"ffffffffffffffff",
                ref_in:false,
                ref_out:false
            );
        }

        /* CRC-64/XZ */
        public static function crc64_xz($str): int {
            return self::crc64(
                str:$str,
                polynomial:"42f0e1eba9ea3693",
                ini:"ffffffffffffffff",
                xor:"ffffffffffffffff",
                ref_in:true,
                ref_out:true
            );
        }

        public static function crc8($str, $polynomial, $ini, $xor, $ref_in, $ref_out): int {
            if (!is_scalar($str))
                throw new \InvalidArgumentException(
                    "Variable for CRC calculation must be a scalar."
                );

            $crc = $ini;

            for ($i = 0; $i < strlen($str); $i++) {
                $byte = ord($str[$i]);

                if ($ref_in)
                    self::reflect_bits($byte, 8);

                $crc ^= $byte;

                for ($j = 0; $j < 8; $j++) {
                    if ($crc & 0x80)
                        $crc = (($crc << 1) & 0xff) ^ $polynomial;
                    else
                        $crc = ($crc << 1) & 0xff;
                }
            }

            $result = ($crc ^ $xor) & 0xff;

            if ($ref_out)
                self::reflect_bits($result, 8);

            return $result;
        }

        public static function crc16(
            $str,
            $polynomial,
            $ini,
            $xor,
            $ref_in,
            $ref_out
        ): int {
            if (!is_scalar($str))
                throw new \InvalidArgumentException(
                    "Variable for CRC calculation must be a scalar."
                );

            $crc = $ini;

            for ($i = 0; $i < strlen($str); $i++) {
                $byte = ord($str[$i]);

                if ($ref_in)
                    self::reflect_bits($byte, 8);

                $crc ^= $byte << 8;

                for ($j = 0; $j < 8; $j++) {
                    if ($crc & 0x8000)
                        $crc = (($crc << 1) & 0xffff) ^ $polynomial;
                    else
                        $crc = ($crc << 1) & 0xffff;
                }
            }

            $result = ($crc ^ $xor) & 0xffff;

            if ($ref_out)
                self::reflect_bits($result, 16);

            return $result;
        }

        public static function crc24(
            $str,
            $polynomial,
            $ini,
            $xor,
            $ref_in,
            $ref_out
        ): int {
            if (!is_scalar($str))
                throw new \InvalidArgumentException(
                    "Variable for CRC calculation must be a scalar."
                );

            $crc = $ini;

            for ($i = 0; $i < strlen($str); $i++) {
                $byte = ord($str[$i]);

                if ($ref_in)
                    self::reflect_bits($byte, 8);

                $crc ^= $byte << 16;

                for ($j = 0; $j < 8; $j++) {
                    $crc = (($crc << 1) & 0xffffffff);

                    if ($crc & 0x1000000)
                        $crc ^= $polynomial;
                }
            }

            $result = ($crc ^ $xor) & 0xffffff;

            if ($ref_out)
                self::reflect_bits($result, 24);

            return $result;
        }

        public static function crc32($str,
            $polynomial,
            $ini,
            $xor,
            $ref_in,
            $ref_out
        ): int {
            if (PHP_INT_SIZE < 8)
                throw new \RuntimeException(
                    "CRC-32 calculation requires 64-bit integers."
                );

            if (!is_scalar($str))
                throw new \InvalidArgumentException(
                    "Variable for CRC calculation must be a scalar."
                );

            $crc = $ini;

            for ($i = 0; $i < strlen($str); $i++) {
                $byte = ord($str[$i]);

                if ($ref_in)
                    self::reflect_bits($byte, 8);

                $crc ^= $byte << 24;

                for ($j = 0; $j < 8; $j++) {
                    if ($crc & 0x80000000)
                        $crc = (($crc << 1) & 0xffffffff) ^ $polynomial;
                    else
                        $crc = ($crc << 1) & 0xffffffff;
                }
            }

            $result = ($crc ^ $xor) & 0xffffffff;

            if ($ref_out)
                self::reflect_bits($result, 32);

            return $result;
        }

        public static function crc64(
            $str,
            $polynomial,
            $ini,
            $xor,
            $ref_in,
            $ref_out
        ): int {
            if (PHP_INT_SIZE < 8)
                throw new \RuntimeException(
                    "CRC-64 calculation requires 64-bit integers."
                );

            if (!is_scalar($str))
                throw new \InvalidArgumentException(
                    "Variable for CRC calculation must be a scalar."
                );

            self::unpack_uint64($polynomial);
            self::unpack_uint64($ini);
            self::unpack_uint64($xor);

            $crc = $ini;
            $x80 = "8000000000000000";
            $xff = "ffffffffffffffff";

            self::unpack_uint64($x80);
            self::unpack_uint64($xff);

            for ($i = 0; $i < strlen($str); $i++) {
                $byte = ord($str[$i]);

                if ($ref_in)
                    self::reflect_bits($byte, 8);

                $crc ^= $byte << 56;

                for ($j = 0; $j < 8; $j++) {
                    if ($crc & $x80)
                        $crc = (($crc << 1) & $xff) ^ $polynomial;
                    else
                        $crc = ($crc << 1) & $xff;
                }
            }

            $result = ($crc ^ $xor) & -1;

            if ($ref_out)
                self::reflect_bits($result, 64);

            return $result;
        }

        public static function test_crc8(): array {
            return self::test_crc("crc8");
        }

        public static function test_crc16(): array {
            return self::test_crc("crc16");
        }

        public static function test_crc24(): array {
            return self::test_crc("crc24");
        }

        public static function test_crc32(): array {
            return self::test_crc("crc32");
        }

        public static function test_crc64(): array {
            return self::test_crc("crc64");
        }

        private static function test_crc($prefix): array {
            $reflect = new \ReflectionClass(get_called_class());
            $methods = $reflect->getMethods(\ReflectionMethod::IS_PUBLIC);
            $results = array();

            foreach ($methods as $method) {
                $name = $method->getShortName();

                if (!str_starts_with($name, $prefix."_"))
                    continue;

                $value = self::$name(self::CRC_CHECK_DATA);
                $check = constant('self::'.strtoupper($name).'_CHECK');

                if (is_string($check))
                    self::unpack_uint64($check);

                $results[] = array(
                    "method" => $name,
                    "calculated" => $value,
                    "check" => $check
                );

                if ($value !== $check)
                    throw new \UnexpectedValueException(
                        "CRC check value mismatch: ".$name."()"
                    );
            }

            return $results;
        }

        private static function reflect_bits(&$num, $width): void {
            $ref = 0;

            for ($i = 0; $i < $width; $i++) { 
                $bit = ($num >> $i) & 0b1;
                $bit = ($bit << (($width - 1) - $i));
                $ref = $ref | $bit;
            }

            $num = $ref;
        }

        /**
         * See: https://bugs.php.net/bug.php?id=76098
         */
        private static function unpack_uint64(&$num): void {
            $int = unpack('J', pack("H*", $num));
            $num = $int[1];
        }
    }