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 *  @param sum Computed checksum. Input parameter.
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 *  @param sum Computed checksum. Input parameter.
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 *  @returns Compacted computed checksum to the 16 bits.
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 *  @returns Compacted computed checksum to the 16 bits.
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 */
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 */
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uint16_t    compact_checksum( uint32_t sum );
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uint16_t    compact_checksum( uint32_t sum );
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/** Returns or flips the checksum if zero.
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 *  @param checksum The computed checksum. Input parameter.
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 *  @returns The internet protocol header checksum.
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 *  @returns 0xFFFF if the computed checksum is zero.
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 */
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uint16_t    flip_checksum( uint16_t checksum );
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/** Computes the ip header checksum.
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/** Computes the ip header checksum.
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 *  To compute the checksum of a new packet, the checksum header field must be zero.
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 *  To compute the checksum of a new packet, the checksum header field must be zero.
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 *  To check the checksum of a received packet, the checksum may be left set.
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 *  To check the checksum of a received packet, the checksum may be left set.
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 *  The zero (0) value will returned in this case if valid.
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 *  The zero (0) value will be returned in this case if valid.
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 *  @param data The header data. Input parameter.
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 *  @param data The header data. Input parameter.
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 *  @param length The header length in bytes. Input parameter.
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 *  @param length The header length in bytes. Input parameter.
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 *  @returns The internet protocol header checksum.
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 *  @returns The internet protocol header checksum.
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 *  @returns 0xFFFF if the computed checksum is zero.
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 *  @returns 0xFFFF if the computed checksum is zero.
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 */
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 */