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#define CRC_DIVIDER_BE  0x04C11DB7
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#define CRC_DIVIDER_BE  0x04C11DB7
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#define CRC_DIVIDER_LE  0xEDB88320
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#define CRC_DIVIDER_LE  0xEDB88320
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/** IP checksum value for computed zero checksum.
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 *  Zero is returned as 0xFFFF (not flipped)
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 */
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#define IP_CHECKSUM_ZERO            0xFFFFu
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uint32_t compute_crc32_le( uint32_t seed, uint8_t * data, size_t length ){
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uint32_t compute_crc32_le( uint32_t seed, uint8_t * data, size_t length ){
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    size_t  index;
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    size_t  index;
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    while( length >= 8 ){
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    while( length >= 8 ){
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        seed ^= ( * data );
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        seed ^= ( * data );
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    while( sum >> 16 ) sum = ( sum & 0xFFFF ) + ( sum >> 16 );
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    while( sum >> 16 ) sum = ( sum & 0xFFFF ) + ( sum >> 16 );
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    return ( uint16_t ) sum;
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    return ( uint16_t ) sum;
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}
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}
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uint16_t ip_checksum( uint8_t * data, size_t length ){
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    uint16_t    checksum;
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    checksum = compact_checksum(compute_checksum( 0, data, length ));
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    // flip, zero is returned as 0xFFFF (not flipped)
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    return ( ~ checksum ) ? ( uint16_t ) ( ~ checksum ) : IP_CHECKSUM_ZERO;
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}
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/** @}
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/** @}
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 */
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 */