path: root/FreeRTOS-Plus/Source/Reliance-Edge/util/crc.c

/*             ----> DO NOT REMOVE THE FOLLOWING NOTICE <----

                   Copyright (c) 2014-2015 Datalight, Inc.
                       All Rights Reserved Worldwide.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; use version 2 of the License.

    This program is distributed in the hope that it will be useful,
    but "AS-IS," WITHOUT ANY WARRANTY; without even the implied warranty
    of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*  Businesses and individuals that for commercial or other reasons cannot
    comply with the terms of the GPLv2 license may obtain a commercial license
    before incorporating Reliance Edge into proprietary software for
    distribution in any form.  Visit http://www.datalight.com/reliance-edge for
    more information.
*/
/** @file
    @brief Implements utilities for calculating CRC-32 checksums.
*/
#include <redfs.h>


/*  The CRC functions do not return errors since the only detectable error
    condition is a NULL buffer pointer.  If such a condition does arise, the
    functions assert and return the below CRC, which, although a legal CRC,
    is nonetheless suspicious and could provide a clue that something has
    gone wrong.
*/
#define SUSPICIOUS_CRC_VALUE    (0xBAADC0DEU)

#define CRC_BITWISE     (0U)
#define CRC_SARWATE     (1U)
#define CRC_SLICEBY8    (2U)


#if REDCONF_CRC_ALGORITHM == CRC_BITWISE

/*  The following is representative of the polynomial accepted by CCITT 32-bit
    and in IEEE 802.3, Ethernet 2 specification.

    x^32+x^26+x^23+x^22+x^16+x^12+x^11+x^10+x^8+x^7+x^5+x^4+x^2+x+1
       (reverse order)
    1110 1101 1011 1000 1000 0011 0010 0000 1
     (E)  (D)  (B)  (8)  (8)  (3)  (2)  (0)
*/
#define CCITT_32_POLYNOMIAL (0xEDB88320U)


/** @brief Compute a CRC32 for the given data buffer.

    For CCITT-32 compliance, the initial CRC must be set to 0.  To CRC multiple
    buffers, call this function with the previously returned CRC value.

    @param ulInitCrc32  Starting CRC value.
    @param pBuffer      Data buffer to calculate the CRC from.
    @param ulLength     Number of bytes of data in the given buffer.

    @return The updated CRC value.
*/
uint32_t RedCrc32Update(
    uint32_t    ulInitCrc32,
    const void *pBuffer,
    uint32_t    ulLength)
{
    uint32_t    ulCrc32;

    if(pBuffer == NULL)
    {
        REDERROR();
        ulCrc32 = SUSPICIOUS_CRC_VALUE;
    }
    else
    {
        const uint8_t  *pbBuffer = CAST_VOID_PTR_TO_CONST_UINT8_PTR(pBuffer);
        uint32_t        ulIdx;

        ulCrc32 = ~ulInitCrc32;

        for(ulIdx = 0U; ulIdx < ulLength; ++ulIdx)
        {
            uint32_t ulBit;

            ulCrc32 ^= pbBuffer[ulIdx];

            /*  Branchless inner loop (greatly improves performance).
            */
            for(ulBit = 0U; ulBit < 8U; ulBit++)
            {
                ulCrc32 = ((ulCrc32 & 1U) * CCITT_32_POLYNOMIAL) ^ (ulCrc32 >> 1U);
            }
        }

        ulCrc32 = ~ulCrc32;
    }

    return ulCrc32;
}

#elif REDCONF_CRC_ALGORITHM == CRC_SARWATE

/** @brief Compute a CRC32 for the given data buffer.

    For CCITT-32 compliance, the initial CRC must be set to 0.  To CRC multiple
    buffers, call this function with the previously returned CRC value.

    @param ulInitCrc32  Starting CRC value.
    @param pBuffer      Data buffer to calculate the CRC from.
    @param ulLength     Number of bytes of data in the given buffer.

    @return The updated CRC value.
*/
uint32_t RedCrc32Update(
    uint32_t    ulInitCrc32,
    const void *pBuffer,
    uint32_t    ulLength)
{
    static const uint32_t aulCrc32Table[] =
    {
        0x00000000U, 0x77073096U, 0xEE0E612CU, 0x990951BAU, 0x076DC419U, 0x706AF48FU, 0xE963A535U, 0x9E6495A3U,
        0x0EDB8832U, 0x79DCB8A4U, 0xE0D5E91EU, 0x97D2D988U, 0x09B64C2BU, 0x7EB17CBDU, 0xE7B82D07U, 0x90BF1D91U,
        0x1DB71064U, 0x6AB020F2U, 0xF3B97148U, 0x84BE41DEU, 0x1ADAD47DU, 0x6DDDE4EBU, 0xF4D4B551U, 0x83D385C7U,
        0x136C9856U, 0x646BA8C0U, 0xFD62F97AU, 0x8A65C9ECU, 0x14015C4FU, 0x63066CD9U, 0xFA0F3D63U, 0x8D080DF5U,
        0x3B6E20C8U, 0x4C69105EU, 0xD56041E4U, 0xA2677172U, 0x3C03E4D1U, 0x4B04D447U, 0xD20D85FDU, 0xA50AB56BU,
        0x35B5A8FAU, 0x42B2986CU, 0xDBBBC9D6U, 0xACBCF940U, 0x32D86CE3U, 0x45DF5C75U, 0xDCD60DCFU, 0xABD13D59U,
        0x26D930ACU, 0x51DE003AU, 0xC8D75180U, 0xBFD06116U, 0x21B4F4B5U, 0x56B3C423U, 0xCFBA9599U, 0xB8BDA50FU,
        0x2802B89EU, 0x5F058808U, 0xC60CD9B2U, 0xB10BE924U, 0x2F6F7C87U, 0x58684C11U, 0xC1611DABU, 0xB6662D3DU,
        0x76DC4190U, 0x01DB7106U, 0x98D220BCU, 0xEFD5102AU, 0x71B18589U, 0x06B6B51FU, 0x9FBFE4A5U, 0xE8B8D433U,
        0x7807C9A2U, 0x0F00F934U, 0x9609A88EU, 0xE10E9818U, 0x7F6A0DBBU, 0x086D3D2DU, 0x91646C97U, 0xE6635C01U,
        0x6B6B51F4U, 0x1C6C6162U, 0x856530D8U, 0xF262004EU, 0x6C0695EDU, 0x1B01A57BU, 0x8208F4C1U, 0xF50FC457U,
        0x65B0D9C6U, 0x12B7E950U, 0x8BBEB8EAU, 0xFCB9887CU, 0x62DD1DDFU, 0x15DA2D49U, 0x8CD37CF3U, 0xFBD44C65U,
        0x4DB26158U, 0x3AB551CEU, 0xA3BC0074U, 0xD4BB30E2U, 0x4ADFA541U, 0x3DD895D7U, 0xA4D1C46DU, 0xD3D6F4FBU,
        0x4369E96AU, 0x346ED9FCU, 0xAD678846U, 0xDA60B8D0U, 0x44042D73U, 0x33031DE5U, 0xAA0A4C5FU, 0xDD0D7CC9U,
        0x5005713CU, 0x270241AAU, 0xBE0B1010U, 0xC90C2086U, 0x5768B525U, 0x206F85B3U, 0xB966D409U, 0xCE61E49FU,
        0x5EDEF90EU, 0x29D9C998U, 0xB0D09822U, 0xC7D7A8B4U, 0x59B33D17U, 0x2EB40D81U, 0xB7BD5C3BU, 0xC0BA6CADU,
        0xEDB88320U, 0x9ABFB3B6U, 0x03B6E20CU, 0x74B1D29AU, 0xEAD54739U, 0x9DD277AFU, 0x04DB2615U, 0x73DC1683U,
        0xE3630B12U, 0x94643B84U, 0x0D6D6A3EU, 0x7A6A5AA8U, 0xE40ECF0BU, 0x9309FF9DU, 0x0A00AE27U, 0x7D079EB1U,
        0xF00F9344U, 0x8708A3D2U, 0x1E01F268U, 0x6906C2FEU, 0xF762575DU, 0x806567CBU, 0x196C3671U, 0x6E6B06E7U,
        0xFED41B76U, 0x89D32BE0U, 0x10DA7A5AU, 0x67DD4ACCU, 0xF9B9DF6FU, 0x8EBEEFF9U, 0x17B7BE43U, 0x60B08ED5U,
        0xD6D6A3E8U, 0xA1D1937EU, 0x38D8C2C4U, 0x4FDFF252U, 0xD1BB67F1U, 0xA6BC5767U, 0x3FB506DDU, 0x48B2364BU,
        0xD80D2BDAU, 0xAF0A1B4CU, 0x36034AF6U, 0x41047A60U, 0xDF60EFC3U, 0xA867DF55U, 0x316E8EEFU, 0x4669BE79U,
        0xCB61B38CU, 0xBC66831AU, 0x256FD2A0U, 0x5268E236U, 0xCC0C7795U, 0xBB0B4703U, 0x220216B9U, 0x5505262FU,
        0xC5BA3BBEU, 0xB2BD0B28U, 0x2BB45A92U, 0x5CB36A04U, 0xC2D7FFA7U, 0xB5D0CF31U, 0x2CD99E8BU, 0x5BDEAE1DU,
        0x9B64C2B0U, 0xEC63F226U, 0x756AA39CU, 0x026D930AU, 0x9C0906A9U, 0xEB0E363FU, 0x72076785U, 0x05005713U,
        0x95BF4A82U, 0xE2B87A14U, 0x7BB12BAEU, 0x0CB61B38U, 0x92D28E9BU, 0xE5D5BE0DU, 0x7CDCEFB7U, 0x0BDBDF21U,
        0x86D3D2D4U, 0xF1D4E242U, 0x68DDB3F8U, 0x1FDA836EU, 0x81BE16CDU, 0xF6B9265BU, 0x6FB077E1U, 0x18B74777U,
        0x88085AE6U, 0xFF0F6A70U, 0x66063BCAU, 0x11010B5CU, 0x8F659EFFU, 0xF862AE69U, 0x616BFFD3U, 0x166CCF45U,
        0xA00AE278U, 0xD70DD2EEU, 0x4E048354U, 0x3903B3C2U, 0xA7672661U, 0xD06016F7U, 0x4969474DU, 0x3E6E77DBU,
        0xAED16A4AU, 0xD9D65ADCU, 0x40DF0B66U, 0x37D83BF0U, 0xA9BCAE53U, 0xDEBB9EC5U, 0x47B2CF7FU, 0x30B5FFE9U,
        0xBDBDF21CU, 0xCABAC28AU, 0x53B39330U, 0x24B4A3A6U, 0xBAD03605U, 0xCDD70693U, 0x54DE5729U, 0x23D967BFU,
        0xB3667A2EU, 0xC4614AB8U, 0x5D681B02U, 0x2A6F2B94U, 0xB40BBE37U, 0xC30C8EA1U, 0x5A05DF1BU, 0x2D02EF8DU,
    };

    uint32_t ulCrc32;

    if(pBuffer == NULL)
    {
        REDERROR();
        ulCrc32 = SUSPICIOUS_CRC_VALUE;
    }
    else
    {
        const uint8_t  *pbBuffer = CAST_VOID_PTR_TO_CONST_UINT8_PTR(pBuffer);
        uint32_t        ulIdx;

        ulCrc32 = ~ulInitCrc32;

        for(ulIdx = 0U; ulIdx < ulLength; ++ulIdx)
        {
            ulCrc32 = (ulCrc32 >> 8U) ^ aulCrc32Table[(ulCrc32 ^ pbBuffer[ulIdx]) & 0xFFU];
        }

        ulCrc32 = ~ulCrc32;
    }

    return ulCrc32;
}

#elif REDCONF_CRC_ALGORITHM == CRC_SLICEBY8


/** @brief Compute a CRC32 for the given data buffer.

    For CCITT-32 compliance, the initial CRC must be set to 0.  To CRC multiple
    buffers, call this function with the previously returned CRC value.

    @param ulInitCrc32  Starting CRC value.
    @param pBuffer      Data buffer to calculate the CRC from.
    @param ulLength     Number of bytes of data in the given buffer.

    @return The updated CRC value.
*/
uint32_t RedCrc32Update(
    uint32_t    ulInitCrc32,
    const void *pBuffer,
    uint32_t    ulLength)
{
    /*  CRC32 XOR table, with slicing-by-8 extensions.

        This first column of the table contains the same XOR values as used in
        the classic byte-at-a-time Sarwate algorithm.  The other seven columns
        are derived from the first, and are used in Intel's slicing-by-eight CRC
        algorithm.

        The layout of this array in memory is novel and deserves explanation.
        In other implementations, including Intel's example, each of the below
        columns is an array.  The first column is a 256-entry array, followed by
        another 256-entry array for the second column, etc.  Testing on both ARM
        and x86 has shown the below mixed arrangement to be about 5-9% faster.
        One possible explanation: With the array-per-table approach, each of the
        eight table lookups is guaranteed to be in a separate 1 KB chunk of
        memory.  With the below array, sometimes multiple table lookups will, by
        coincidence, be close together, making better use of the cache.
    */
    static const uint32_t aulCrc32Table[] =
    {
        0x00000000U, 0x00000000U, 0x00000000U, 0x00000000U, 0x00000000U, 0x00000000U, 0x00000000U, 0x00000000U,
        0x77073096U, 0x191B3141U, 0x01C26A37U, 0xB8BC6765U, 0x3D6029B0U, 0xCB5CD3A5U, 0xA6770BB4U, 0xCCAA009EU,
        0xEE0E612CU, 0x32366282U, 0x0384D46EU, 0xAA09C88BU, 0x7AC05360U, 0x4DC8A10BU, 0x979F1129U, 0x4225077DU,
        0x990951BAU, 0x2B2D53C3U, 0x0246BE59U, 0x12B5AFEEU, 0x47A07AD0U, 0x869472AEU, 0x31E81A9DU, 0x8E8F07E3U,
        0x076DC419U, 0x646CC504U, 0x0709A8DCU, 0x8F629757U, 0xF580A6C0U, 0x9B914216U, 0xF44F2413U, 0x844A0EFAU,
        0x706AF48FU, 0x7D77F445U, 0x06CBC2EBU, 0x37DEF032U, 0xC8E08F70U, 0x50CD91B3U, 0x52382FA7U, 0x48E00E64U,
        0xE963A535U, 0x565AA786U, 0x048D7CB2U, 0x256B5FDCU, 0x8F40F5A0U, 0xD659E31DU, 0x63D0353AU, 0xC66F0987U,
        0x9E6495A3U, 0x4F4196C7U, 0x054F1685U, 0x9DD738B9U, 0xB220DC10U, 0x1D0530B8U, 0xC5A73E8EU, 0x0AC50919U,
        0x0EDB8832U, 0xC8D98A08U, 0x0E1351B8U, 0xC5B428EFU, 0x30704BC1U, 0xEC53826DU, 0x33EF4E67U, 0xD3E51BB5U,
        0x79DCB8A4U, 0xD1C2BB49U, 0x0FD13B8FU, 0x7D084F8AU, 0x0D106271U, 0x270F51C8U, 0x959845D3U, 0x1F4F1B2BU,
        0xE0D5E91EU, 0xFAEFE88AU, 0x0D9785D6U, 0x6FBDE064U, 0x4AB018A1U, 0xA19B2366U, 0xA4705F4EU, 0x91C01CC8U,
        0x97D2D988U, 0xE3F4D9CBU, 0x0C55EFE1U, 0xD7018701U, 0x77D03111U, 0x6AC7F0C3U, 0x020754FAU, 0x5D6A1C56U,
        0x09B64C2BU, 0xACB54F0CU, 0x091AF964U, 0x4AD6BFB8U, 0xC5F0ED01U, 0x77C2C07BU, 0xC7A06A74U, 0x57AF154FU,
        0x7EB17CBDU, 0xB5AE7E4DU, 0x08D89353U, 0xF26AD8DDU, 0xF890C4B1U, 0xBC9E13DEU, 0x61D761C0U, 0x9B0515D1U,
        0xE7B82D07U, 0x9E832D8EU, 0x0A9E2D0AU, 0xE0DF7733U, 0xBF30BE61U, 0x3A0A6170U, 0x503F7B5DU, 0x158A1232U,
        0x90BF1D91U, 0x87981CCFU, 0x0B5C473DU, 0x58631056U, 0x825097D1U, 0xF156B2D5U, 0xF64870E9U, 0xD92012ACU,
        0x1DB71064U, 0x4AC21251U, 0x1C26A370U, 0x5019579FU, 0x60E09782U, 0x03D6029BU, 0x67DE9CCEU, 0x7CBB312BU,
        0x6AB020F2U, 0x53D92310U, 0x1DE4C947U, 0xE8A530FAU, 0x5D80BE32U, 0xC88AD13EU, 0xC1A9977AU, 0xB01131B5U,
        0xF3B97148U, 0x78F470D3U, 0x1FA2771EU, 0xFA109F14U, 0x1A20C4E2U, 0x4E1EA390U, 0xF0418DE7U, 0x3E9E3656U,
        0x84BE41DEU, 0x61EF4192U, 0x1E601D29U, 0x42ACF871U, 0x2740ED52U, 0x85427035U, 0x56368653U, 0xF23436C8U,
        0x1ADAD47DU, 0x2EAED755U, 0x1B2F0BACU, 0xDF7BC0C8U, 0x95603142U, 0x9847408DU, 0x9391B8DDU, 0xF8F13FD1U,
        0x6DDDE4EBU, 0x37B5E614U, 0x1AED619BU, 0x67C7A7ADU, 0xA80018F2U, 0x531B9328U, 0x35E6B369U, 0x345B3F4FU,
        0xF4D4B551U, 0x1C98B5D7U, 0x18ABDFC2U, 0x75720843U, 0xEFA06222U, 0xD58FE186U, 0x040EA9F4U, 0xBAD438ACU,
        0x83D385C7U, 0x05838496U, 0x1969B5F5U, 0xCDCE6F26U, 0xD2C04B92U, 0x1ED33223U, 0xA279A240U, 0x767E3832U,
        0x136C9856U, 0x821B9859U, 0x1235F2C8U, 0x95AD7F70U, 0x5090DC43U, 0xEF8580F6U, 0x5431D2A9U, 0xAF5E2A9EU,
        0x646BA8C0U, 0x9B00A918U, 0x13F798FFU, 0x2D111815U, 0x6DF0F5F3U, 0x24D95353U, 0xF246D91DU, 0x63F42A00U,
        0xFD62F97AU, 0xB02DFADBU, 0x11B126A6U, 0x3FA4B7FBU, 0x2A508F23U, 0xA24D21FDU, 0xC3AEC380U, 0xED7B2DE3U,
        0x8A65C9ECU, 0xA936CB9AU, 0x10734C91U, 0x8718D09EU, 0x1730A693U, 0x6911F258U, 0x65D9C834U, 0x21D12D7DU,
        0x14015C4FU, 0xE6775D5DU, 0x153C5A14U, 0x1ACFE827U, 0xA5107A83U, 0x7414C2E0U, 0xA07EF6BAU, 0x2B142464U,
        0x63066CD9U, 0xFF6C6C1CU, 0x14FE3023U, 0xA2738F42U, 0x98705333U, 0xBF481145U, 0x0609FD0EU, 0xE7BE24FAU,
        0xFA0F3D63U, 0xD4413FDFU, 0x16B88E7AU, 0xB0C620ACU, 0xDFD029E3U, 0x39DC63EBU, 0x37E1E793U, 0x69312319U,
        0x8D080DF5U, 0xCD5A0E9EU, 0x177AE44DU, 0x087A47C9U, 0xE2B00053U, 0xF280B04EU, 0x9196EC27U, 0xA59B2387U,
        0x3B6E20C8U, 0x958424A2U, 0x384D46E0U, 0xA032AF3EU, 0xC1C12F04U, 0x07AC0536U, 0xCFBD399CU, 0xF9766256U,
        0x4C69105EU, 0x8C9F15E3U, 0x398F2CD7U, 0x188EC85BU, 0xFCA106B4U, 0xCCF0D693U, 0x69CA3228U, 0x35DC62C8U,
        0xD56041E4U, 0xA7B24620U, 0x3BC9928EU, 0x0A3B67B5U, 0xBB017C64U, 0x4A64A43DU, 0x582228B5U, 0xBB53652BU,
        0xA2677172U, 0xBEA97761U, 0x3A0BF8B9U, 0xB28700D0U, 0x866155D4U, 0x81387798U, 0xFE552301U, 0x77F965B5U,
        0x3C03E4D1U, 0xF1E8E1A6U, 0x3F44EE3CU, 0x2F503869U, 0x344189C4U, 0x9C3D4720U, 0x3BF21D8FU, 0x7D3C6CACU,
        0x4B04D447U, 0xE8F3D0E7U, 0x3E86840BU, 0x97EC5F0CU, 0x0921A074U, 0x57619485U, 0x9D85163BU, 0xB1966C32U,
        0xD20D85FDU, 0xC3DE8324U, 0x3CC03A52U, 0x8559F0E2U, 0x4E81DAA4U, 0xD1F5E62BU, 0xAC6D0CA6U, 0x3F196BD1U,
        0xA50AB56BU, 0xDAC5B265U, 0x3D025065U, 0x3DE59787U, 0x73E1F314U, 0x1AA9358EU, 0x0A1A0712U, 0xF3B36B4FU,
        0x35B5A8FAU, 0x5D5DAEAAU, 0x365E1758U, 0x658687D1U, 0xF1B164C5U, 0xEBFF875BU, 0xFC5277FBU, 0x2A9379E3U,
        0x42B2986CU, 0x44469FEBU, 0x379C7D6FU, 0xDD3AE0B4U, 0xCCD14D75U, 0x20A354FEU, 0x5A257C4FU, 0xE639797DU,
        0xDBBBC9D6U, 0x6F6BCC28U, 0x35DAC336U, 0xCF8F4F5AU, 0x8B7137A5U, 0xA6372650U, 0x6BCD66D2U, 0x68B67E9EU,
        0xACBCF940U, 0x7670FD69U, 0x3418A901U, 0x7733283FU, 0xB6111E15U, 0x6D6BF5F5U, 0xCDBA6D66U, 0xA41C7E00U,
        0x32D86CE3U, 0x39316BAEU, 0x3157BF84U, 0xEAE41086U, 0x0431C205U, 0x706EC54DU, 0x081D53E8U, 0xAED97719U,
        0x45DF5C75U, 0x202A5AEFU, 0x3095D5B3U, 0x525877E3U, 0x3951EBB5U, 0xBB3216E8U, 0xAE6A585CU, 0x62737787U,
        0xDCD60DCFU, 0x0B07092CU, 0x32D36BEAU, 0x40EDD80DU, 0x7EF19165U, 0x3DA66446U, 0x9F8242C1U, 0xECFC7064U,
        0xABD13D59U, 0x121C386DU, 0x331101DDU, 0xF851BF68U, 0x4391B8D5U, 0xF6FAB7E3U, 0x39F54975U, 0x205670FAU,
        0x26D930ACU, 0xDF4636F3U, 0x246BE590U, 0xF02BF8A1U, 0xA121B886U, 0x047A07ADU, 0xA863A552U, 0x85CD537DU,
        0x51DE003AU, 0xC65D07B2U, 0x25A98FA7U, 0x48979FC4U, 0x9C419136U, 0xCF26D408U, 0x0E14AEE6U, 0x496753E3U,
        0xC8D75180U, 0xED705471U, 0x27EF31FEU, 0x5A22302AU, 0xDBE1EBE6U, 0x49B2A6A6U, 0x3FFCB47BU, 0xC7E85400U,
        0xBFD06116U, 0xF46B6530U, 0x262D5BC9U, 0xE29E574FU, 0xE681C256U, 0x82EE7503U, 0x998BBFCFU, 0x0B42549EU,
        0x21B4F4B5U, 0xBB2AF3F7U, 0x23624D4CU, 0x7F496FF6U, 0x54A11E46U, 0x9FEB45BBU, 0x5C2C8141U, 0x01875D87U,
        0x56B3C423U, 0xA231C2B6U, 0x22A0277BU, 0xC7F50893U, 0x69C137F6U, 0x54B7961EU, 0xFA5B8AF5U, 0xCD2D5D19U,
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        0xD1BB67F1U, 0xCA6B79EDU, 0xDE71F5BCU, 0xC2098E52U, 0x85A73956U, 0x828D53F8U, 0xB3E4F77DU, 0x2E07E976U,
        0xA6BC5767U, 0xD37048ACU, 0xDFB39F8BU, 0x7AB5E937U, 0xB8C710E6U, 0x49D1805DU, 0x1593FCC9U, 0xE2ADE9E8U,
        0x3FB506DDU, 0xF85D1B6FU, 0xDDF521D2U, 0x680046D9U, 0xFF676A36U, 0xCF45F2F3U, 0x247BE654U, 0x6C22EE0BU,
        0x48B2364BU, 0xE1462A2EU, 0xDC374BE5U, 0xD0BC21BCU, 0xC2074386U, 0x04192156U, 0x820CEDE0U, 0xA088EE95U,
        0xD80D2BDAU, 0x66DE36E1U, 0xD76B0CD8U, 0x88DF31EAU, 0x4057D457U, 0xF54F9383U, 0x74449D09U, 0x79A8FC39U,
        0xAF0A1B4CU, 0x7FC507A0U, 0xD6A966EFU, 0x3063568FU, 0x7D37FDE7U, 0x3E134026U, 0xD23396BDU, 0xB502FCA7U,
        0x36034AF6U, 0x54E85463U, 0xD4EFD8B6U, 0x22D6F961U, 0x3A978737U, 0xB8873288U, 0xE3DB8C20U, 0x3B8DFB44U,
        0x41047A60U, 0x4DF36522U, 0xD52DB281U, 0x9A6A9E04U, 0x07F7AE87U, 0x73DBE12DU, 0x45AC8794U, 0xF727FBDAU,
        0xDF60EFC3U, 0x02B2F3E5U, 0xD062A404U, 0x07BDA6BDU, 0xB5D77297U, 0x6EDED195U, 0x800BB91AU, 0xFDE2F2C3U,
        0xA867DF55U, 0x1BA9C2A4U, 0xD1A0CE33U, 0xBF01C1D8U, 0x88B75B27U, 0xA5820230U, 0x267CB2AEU, 0x3148F25DU,
        0x316E8EEFU, 0x30849167U, 0xD3E6706AU, 0xADB46E36U, 0xCF1721F7U, 0x2316709EU, 0x1794A833U, 0xBFC7F5BEU,
        0x4669BE79U, 0x299FA026U, 0xD2241A5DU, 0x15080953U, 0xF2770847U, 0xE84AA33BU, 0xB1E3A387U, 0x736DF520U,
        0xCB61B38CU, 0xE4C5AEB8U, 0xC55EFE10U, 0x1D724E9AU, 0x10C70814U, 0x1ACA1375U, 0x20754FA0U, 0xD6F6D6A7U,
        0xBC66831AU, 0xFDDE9FF9U, 0xC49C9427U, 0xA5CE29FFU, 0x2DA721A4U, 0xD196C0D0U, 0x86024414U, 0x1A5CD639U,
        0x256FD2A0U, 0xD6F3CC3AU, 0xC6DA2A7EU, 0xB77B8611U, 0x6A075B74U, 0x5702B27EU, 0xB7EA5E89U, 0x94D3D1DAU,
        0x5268E236U, 0xCFE8FD7BU, 0xC7184049U, 0x0FC7E174U, 0x576772C4U, 0x9C5E61DBU, 0x119D553DU, 0x5879D144U,
        0xCC0C7795U, 0x80A96BBCU, 0xC25756CCU, 0x9210D9CDU, 0xE547AED4U, 0x815B5163U, 0xD43A6BB3U, 0x52BCD85DU,
        0xBB0B4703U, 0x99B25AFDU, 0xC3953CFBU, 0x2AACBEA8U, 0xD8278764U, 0x4A0782C6U, 0x724D6007U, 0x9E16D8C3U,
        0x220216B9U, 0xB29F093EU, 0xC1D382A2U, 0x38191146U, 0x9F87FDB4U, 0xCC93F068U, 0x43A57A9AU, 0x1099DF20U,
        0x5505262FU, 0xAB84387FU, 0xC011E895U, 0x80A57623U, 0xA2E7D404U, 0x07CF23CDU, 0xE5D2712EU, 0xDC33DFBEU,
        0xC5BA3BBEU, 0x2C1C24B0U, 0xCB4DAFA8U, 0xD8C66675U, 0x20B743D5U, 0xF6999118U, 0x139A01C7U, 0x0513CD12U,
        0xB2BD0B28U, 0x350715F1U, 0xCA8FC59FU, 0x607A0110U, 0x1DD76A65U, 0x3DC542BDU, 0xB5ED0A73U, 0xC9B9CD8CU,
        0x2BB45A92U, 0x1E2A4632U, 0xC8C97BC6U, 0x72CFAEFEU, 0x5A7710B5U, 0xBB513013U, 0x840510EEU, 0x4736CA6FU,
        0x5CB36A04U, 0x07317773U, 0xC90B11F1U, 0xCA73C99BU, 0x67173905U, 0x700DE3B6U, 0x22721B5AU, 0x8B9CCAF1U,
        0xC2D7FFA7U, 0x4870E1B4U, 0xCC440774U, 0x57A4F122U, 0xD537E515U, 0x6D08D30EU, 0xE7D525D4U, 0x8159C3E8U,
        0xB5D0CF31U, 0x516BD0F5U, 0xCD866D43U, 0xEF189647U, 0xE857CCA5U, 0xA65400ABU, 0x41A22E60U, 0x4DF3C376U,
        0x2CD99E8BU, 0x7A468336U, 0xCFC0D31AU, 0xFDAD39A9U, 0xAFF7B675U, 0x20C07205U, 0x704A34FDU, 0xC37CC495U,
        0x5BDEAE1DU, 0x635DB277U, 0xCE02B92DU, 0x45115ECCU, 0x92979FC5U, 0xEB9CA1A0U, 0xD63D3F49U, 0x0FD6C40BU,
        0x9B64C2B0U, 0xCBFAD74EU, 0x91AF9640U, 0x764DEE06U, 0xE915E8DBU, 0x11E81EB4U, 0xCC1D9F8BU, 0x7AA64737U,
        0xEC63F226U, 0xD2E1E60FU, 0x906DFC77U, 0xCEF18963U, 0xD475C16BU, 0xDAB4CD11U, 0x6A6A943FU, 0xB60C47A9U,
        0x756AA39CU, 0xF9CCB5CCU, 0x922B422EU, 0xDC44268DU, 0x93D5BBBBU, 0x5C20BFBFU, 0x5B828EA2U, 0x3883404AU,
        0x026D930AU, 0xE0D7848DU, 0x93E92819U, 0x64F841E8U, 0xAEB5920BU, 0x977C6C1AU, 0xFDF58516U, 0xF42940D4U,
        0x9C0906A9U, 0xAF96124AU, 0x96A63E9CU, 0xF92F7951U, 0x1C954E1BU, 0x8A795CA2U, 0x3852BB98U, 0xFEEC49CDU,
        0xEB0E363FU, 0xB68D230BU, 0x976454ABU, 0x41931E34U, 0x21F567ABU, 0x41258F07U, 0x9E25B02CU, 0x32464953U,
        0x72076785U, 0x9DA070C8U, 0x9522EAF2U, 0x5326B1DAU, 0x66551D7BU, 0xC7B1FDA9U, 0xAFCDAAB1U, 0xBCC94EB0U,
        0x05005713U, 0x84BB4189U, 0x94E080C5U, 0xEB9AD6BFU, 0x5B3534CBU, 0x0CED2E0CU, 0x09BAA105U, 0x70634E2EU,
        0x95BF4A82U, 0x03235D46U, 0x9FBCC7F8U, 0xB3F9C6E9U, 0xD965A31AU, 0xFDBB9CD9U, 0xFFF2D1ECU, 0xA9435C82U,
        0xE2B87A14U, 0x1A386C07U, 0x9E7EADCFU, 0x0B45A18CU, 0xE4058AAAU, 0x36E74F7CU, 0x5985DA58U, 0x65E95C1CU,
        0x7BB12BAEU, 0x31153FC4U, 0x9C381396U, 0x19F00E62U, 0xA3A5F07AU, 0xB0733DD2U, 0x686DC0C5U, 0xEB665BFFU,
        0x0CB61B38U, 0x280E0E85U, 0x9DFA79A1U, 0xA14C6907U, 0x9EC5D9CAU, 0x7B2FEE77U, 0xCE1ACB71U, 0x27CC5B61U,
        0x92D28E9BU, 0x674F9842U, 0x98B56F24U, 0x3C9B51BEU, 0x2CE505DAU, 0x662ADECFU, 0x0BBDF5FFU, 0x2D095278U,
        0xE5D5BE0DU, 0x7E54A903U, 0x99770513U, 0x842736DBU, 0x11852C6AU, 0xAD760D6AU, 0xADCAFE4BU, 0xE1A352E6U,
        0x7CDCEFB7U, 0x5579FAC0U, 0x9B31BB4AU, 0x96929935U, 0x562556BAU, 0x2BE27FC4U, 0x9C22E4D6U, 0x6F2C5505U,
        0x0BDBDF21U, 0x4C62CB81U, 0x9AF3D17DU, 0x2E2EFE50U, 0x6B457F0AU, 0xE0BEAC61U, 0x3A55EF62U, 0xA386559BU,
        0x86D3D2D4U, 0x8138C51FU, 0x8D893530U, 0x2654B999U, 0x89F57F59U, 0x123E1C2FU, 0xABC30345U, 0x061D761CU,
        0xF1D4E242U, 0x9823F45EU, 0x8C4B5F07U, 0x9EE8DEFCU, 0xB49556E9U, 0xD962CF8AU, 0x0DB408F1U, 0xCAB77682U,
        0x68DDB3F8U, 0xB30EA79DU, 0x8E0DE15EU, 0x8C5D7112U, 0xF3352C39U, 0x5FF6BD24U, 0x3C5C126CU, 0x44387161U,
        0x1FDA836EU, 0xAA1596DCU, 0x8FCF8B69U, 0x34E11677U, 0xCE550589U, 0x94AA6E81U, 0x9A2B19D8U, 0x889271FFU,
        0x81BE16CDU, 0xE554001BU, 0x8A809DECU, 0xA9362ECEU, 0x7C75D999U, 0x89AF5E39U, 0x5F8C2756U, 0x825778E6U,
        0xF6B9265BU, 0xFC4F315AU, 0x8B42F7DBU, 0x118A49ABU, 0x4115F029U, 0x42F38D9CU, 0xF9FB2CE2U, 0x4EFD7878U,
        0x6FB077E1U, 0xD7626299U, 0x89044982U, 0x033FE645U, 0x06B58AF9U, 0xC467FF32U, 0xC813367FU, 0xC0727F9BU,
        0x18B74777U, 0xCE7953D8U, 0x88C623B5U, 0xBB838120U, 0x3BD5A349U, 0x0F3B2C97U, 0x6E643DCBU, 0x0CD87F05U,
        0x88085AE6U, 0x49E14F17U, 0x839A6488U, 0xE3E09176U, 0xB9853498U, 0xFE6D9E42U, 0x982C4D22U, 0xD5F86DA9U,
        0xFF0F6A70U, 0x50FA7E56U, 0x82580EBFU, 0x5B5CF613U, 0x84E51D28U, 0x35314DE7U, 0x3E5B4696U, 0x19526D37U,
        0x66063BCAU, 0x7BD72D95U, 0x801EB0E6U, 0x49E959FDU, 0xC34567F8U, 0xB3A53F49U, 0x0FB35C0BU, 0x97DD6AD4U,
        0x11010B5CU, 0x62CC1CD4U, 0x81DCDAD1U, 0xF1553E98U, 0xFE254E48U, 0x78F9ECECU, 0xA9C457BFU, 0x5B776A4AU,
        0x8F659EFFU, 0x2D8D8A13U, 0x8493CC54U, 0x6C820621U, 0x4C059258U, 0x65FCDC54U, 0x6C636931U, 0x51B26353U,
        0xF862AE69U, 0x3496BB52U, 0x8551A663U, 0xD43E6144U, 0x7165BBE8U, 0xAEA00FF1U, 0xCA146285U, 0x9D1863CDU,
        0x616BFFD3U, 0x1FBBE891U, 0x8717183AU, 0xC68BCEAAU, 0x36C5C138U, 0x28347D5FU, 0xFBFC7818U, 0x1397642EU,
        0x166CCF45U, 0x06A0D9D0U, 0x86D5720DU, 0x7E37A9CFU, 0x0BA5E888U, 0xE368AEFAU, 0x5D8B73ACU, 0xDF3D64B0U,
        0xA00AE278U, 0x5E7EF3ECU, 0xA9E2D0A0U, 0xD67F4138U, 0x28D4C7DFU, 0x16441B82U, 0x03A0A617U, 0x83D02561U,
        0xD70DD2EEU, 0x4765C2ADU, 0xA820BA97U, 0x6EC3265DU, 0x15B4EE6FU, 0xDD18C827U, 0xA5D7ADA3U, 0x4F7A25FFU,
        0x4E048354U, 0x6C48916EU, 0xAA6604CEU, 0x7C7689B3U, 0x521494BFU, 0x5B8CBA89U, 0x943FB73EU, 0xC1F5221CU,
        0x3903B3C2U, 0x7553A02FU, 0xABA46EF9U, 0xC4CAEED6U, 0x6F74BD0FU, 0x90D0692CU, 0x3248BC8AU, 0x0D5F2282U,
        0xA7672661U, 0x3A1236E8U, 0xAEEB787CU, 0x591DD66FU, 0xDD54611FU, 0x8DD55994U, 0xF7EF8204U, 0x079A2B9BU,
        0xD06016F7U, 0x230907A9U, 0xAF29124BU, 0xE1A1B10AU, 0xE03448AFU, 0x46898A31U, 0x519889B0U, 0xCB302B05U,
        0x4969474DU, 0x0824546AU, 0xAD6FAC12U, 0xF3141EE4U, 0xA794327FU, 0xC01DF89FU, 0x6070932DU, 0x45BF2CE6U,
        0x3E6E77DBU, 0x113F652BU, 0xACADC625U, 0x4BA87981U, 0x9AF41BCFU, 0x0B412B3AU, 0xC6079899U, 0x89152C78U,
        0xAED16A4AU, 0x96A779E4U, 0xA7F18118U, 0x13CB69D7U, 0x18A48C1EU, 0xFA1799EFU, 0x304FE870U, 0x50353ED4U,
        0xD9D65ADCU, 0x8FBC48A5U, 0xA633EB2FU, 0xAB770EB2U, 0x25C4A5AEU, 0x314B4A4AU, 0x9638E3C4U, 0x9C9F3E4AU,
        0x40DF0B66U, 0xA4911B66U, 0xA4755576U, 0xB9C2A15CU, 0x6264DF7EU, 0xB7DF38E4U, 0xA7D0F959U, 0x121039A9U,
        0x37D83BF0U, 0xBD8A2A27U, 0xA5B73F41U, 0x017EC639U, 0x5F04F6CEU, 0x7C83EB41U, 0x01A7F2EDU, 0xDEBA3937U,
        0xA9BCAE53U, 0xF2CBBCE0U, 0xA0F829C4U, 0x9CA9FE80U, 0xED242ADEU, 0x6186DBF9U, 0xC400CC63U, 0xD47F302EU,
        0xDEBB9EC5U, 0xEBD08DA1U, 0xA13A43F3U, 0x241599E5U, 0xD044036EU, 0xAADA085CU, 0x6277C7D7U, 0x18D530B0U,
        0x47B2CF7FU, 0xC0FDDE62U, 0xA37CFDAAU, 0x36A0360BU, 0x97E479BEU, 0x2C4E7AF2U, 0x539FDD4AU, 0x965A3753U,
        0x30B5FFE9U, 0xD9E6EF23U, 0xA2BE979DU, 0x8E1C516EU, 0xAA84500EU, 0xE712A957U, 0xF5E8D6FEU, 0x5AF037CDU,
        0xBDBDF21CU, 0x14BCE1BDU, 0xB5C473D0U, 0x866616A7U, 0x4834505DU, 0x15921919U, 0x647E3AD9U, 0xFF6B144AU,
        0xCABAC28AU, 0x0DA7D0FCU, 0xB40619E7U, 0x3EDA71C2U, 0x755479EDU, 0xDECECABCU, 0xC209316DU, 0x33C114D4U,
        0x53B39330U, 0x268A833FU, 0xB640A7BEU, 0x2C6FDE2CU, 0x32F4033DU, 0x585AB812U, 0xF3E12BF0U, 0xBD4E1337U,
        0x24B4A3A6U, 0x3F91B27EU, 0xB782CD89U, 0x94D3B949U, 0x0F942A8DU, 0x93066BB7U, 0x55962044U, 0x71E413A9U,
        0xBAD03605U, 0x70D024B9U, 0xB2CDDB0CU, 0x090481F0U, 0xBDB4F69DU, 0x8E035B0FU, 0x90311ECAU, 0x7B211AB0U,
        0xCDD70693U, 0x69CB15F8U, 0xB30FB13BU, 0xB1B8E695U, 0x80D4DF2DU, 0x455F88AAU, 0x3646157EU, 0xB78B1A2EU,
        0x54DE5729U, 0x42E6463BU, 0xB1490F62U, 0xA30D497BU, 0xC774A5FDU, 0xC3CBFA04U, 0x07AE0FE3U, 0x39041DCDU,
        0x23D967BFU, 0x5BFD777AU, 0xB08B6555U, 0x1BB12E1EU, 0xFA148C4DU, 0x089729A1U, 0xA1D90457U, 0xF5AE1D53U,
        0xB3667A2EU, 0xDC656BB5U, 0xBBD72268U, 0x43D23E48U, 0x78441B9CU, 0xF9C19B74U, 0x579174BEU, 0x2C8E0FFFU,
        0xC4614AB8U, 0xC57E5AF4U, 0xBA15485FU, 0xFB6E592DU, 0x4524322CU, 0x329D48D1U, 0xF1E67F0AU, 0xE0240F61U,
        0x5D681B02U, 0xEE530937U, 0xB853F606U, 0xE9DBF6C3U, 0x028448FCU, 0xB4093A7FU, 0xC00E6597U, 0x6EAB0882U,
        0x2A6F2B94U, 0xF7483876U, 0xB9919C31U, 0x516791A6U, 0x3FE4614CU, 0x7F55E9DAU, 0x66796E23U, 0xA201081CU,
        0xB40BBE37U, 0xB809AEB1U, 0xBCDE8AB4U, 0xCCB0A91FU, 0x8DC4BD5CU, 0x6250D962U, 0xA3DE50ADU, 0xA8C40105U,
        0xC30C8EA1U, 0xA1129FF0U, 0xBD1CE083U, 0x740CCE7AU, 0xB0A494ECU, 0xA90C0AC7U, 0x05A95B19U, 0x646E019BU,
        0x5A05DF1BU, 0x8A3FCC33U, 0xBF5A5EDAU, 0x66B96194U, 0xF704EE3CU, 0x2F987869U, 0x34414184U, 0xEAE10678U,
        0x2D02EF8DU, 0x9324FD72U, 0xBE9834EDU, 0xDE0506F1U, 0xCA64C78CU, 0xE4C4ABCCU, 0x92364A30U, 0x264B06E6U,
    };

    uint32_t ulCrc32;

    if(pBuffer == NULL)
    {
        REDERROR();
        ulCrc32 = SUSPICIOUS_CRC_VALUE;
    }
    else
    {
        const uint8_t  *pbBuffer = CAST_VOID_PTR_TO_CONST_UINT8_PTR(pBuffer);
        uint32_t        ulIdx = 0U;
        const uint32_t *pulXorCrc0 = &aulCrc32Table[7U];
        const uint32_t *pulXorCrc1 = &aulCrc32Table[6U];
        const uint32_t *pulXorCrc2 = &aulCrc32Table[5U];
        const uint32_t *pulXorCrc3 = &aulCrc32Table[4U];
        const uint32_t *pulXorData4 = &aulCrc32Table[3U];
        const uint32_t *pulXorData5 = &aulCrc32Table[2U];
        const uint32_t *pulXorData6 = &aulCrc32Table[1U];
        const uint32_t *pulXorData7 = &aulCrc32Table[0U];
        uint32_t        ulSliceLen;

        ulCrc32 = ~ulInitCrc32;

        /*  Aligned memory access is used below.  To avoid suboptimal
            performance and faults (depending on platform), handle the
            unaligned initial bytes (if any) using the Sarwate algorithm.
        */
        while((ulIdx < ulLength) && !IS_ALIGNED_PTR(&pbBuffer[ulIdx]))
        {
            ulCrc32 = (ulCrc32 >> 8U) ^ aulCrc32Table[((ulCrc32 ^ pbBuffer[ulIdx]) & 0xFFU) << 3U];

            ulIdx++;
        }

        /*  Round down the length to the nearest multiple of eight.
        */
        ulSliceLen = (((ulLength - ulIdx) >> 3U) << 3U) + ulIdx;

        /*  Compute the CRC in eight byte "slices".  Takes advantage of
            modern processors which can load in parallel from multiple
            memory locations.
        */
        while(ulIdx < ulSliceLen)
        {
          #if REDCONF_ENDIAN_BIG == 1
            ulCrc32 ^= pbBuffer[ulIdx] | ((uint32_t)pbBuffer[ulIdx+1U] << 8U) |
                       ((uint32_t)pbBuffer[ulIdx+2U] << 16U) | ((uint32_t)pbBuffer[ulIdx+3U] << 24U);
          #else
            ulCrc32 ^= *CAST_CONST_UINT32_PTR(&pbBuffer[ulIdx]);
          #endif

            ulCrc32 =
                pulXorCrc3[((ulCrc32 >> 24U) & 0xFFU) << 3U] ^
                pulXorCrc2[((ulCrc32 >> 16U) & 0xFFU) << 3U] ^
                pulXorCrc1[((ulCrc32 >> 8U)  & 0xFFU) << 3U] ^
                pulXorCrc0[ (ulCrc32         & 0xFFU) << 3U] ^
                pulXorData7[pbBuffer[ulIdx+7U] << 3U] ^
                pulXorData6[pbBuffer[ulIdx+6U] << 3U] ^
                pulXorData5[pbBuffer[ulIdx+5U] << 3U] ^
                pulXorData4[pbBuffer[ulIdx+4U] << 3U];

            ulIdx += 8U;
        }

        /*  Compute the remaining bytes with the Sarwate algorithm.
        */
        while(ulIdx < ulLength)
        {
            ulCrc32 = (ulCrc32 >> 8U) ^ aulCrc32Table[((ulCrc32 ^ pbBuffer[ulIdx]) & 0xFFU) << 3U];

            ulIdx++;
        }

        ulCrc32 = ~ulCrc32;
    }

    return ulCrc32;
}

#else

#error "REDCONF_CRC_ALGORITHM must be set to CRC_BITWISE, CRC_SARWATE, or CRC_SLICEBY8"

#endif


/** @brief Compute a CRC32 for a metadata node buffer.

    @param pBuffer  The metadata node buffer for which to compute a CRC.  Must
                    be a block sized buffer.

    @return The CRC of the buffer.
*/
uint32_t RedCrcNode(
    const void *pBuffer)
{
    uint32_t    ulCrc;

    if(pBuffer == NULL)
    {
        REDERROR();
        ulCrc = SUSPICIOUS_CRC_VALUE;
    }
    else
    {
        const uint8_t *pbBuffer = CAST_VOID_PTR_TO_CONST_UINT8_PTR(pBuffer);

        /*  The first eight bytes of a metadata node contain the signature and
            the CRC.  There is little value in CRCing the signature, and the
            CRC cannot be CRC'd, so skip over that part of the buffer.
        */
        ulCrc = RedCrc32Update(0U, &pbBuffer[8U], REDCONF_BLOCK_SIZE - 8U);
    }

    return ulCrc;
}