inet::TcpIpChecksum Class Reference

Calculates checksum. More...

#include <TcpIpChecksum.h>

Public Member Functions
	TcpIpChecksum ()

Static Public Member Functions
static uint16_t	checksum (const void *addr, unsigned int count)
static uint16_t	_checksum (const void *addr, unsigned int count)
static uint16_t	_checksum (const std::vector< uint8_t > &vec)
static uint16_t	checksum (const std::vector< uint8_t > &vec)

Detailed Description

Calculates checksum.

Constructor & Destructor Documentation

TcpIpChecksum()

inet::TcpIpChecksum::TcpIpChecksum ( )

inline

{}

Member Function Documentation

_checksum() [1/2]

uint16_t inet::TcpIpChecksum::_checksum ( const std::vector< uint8_t > &  vec )

static

{
    uint32_t sum = 0;
    for (size_t i = 0; i < vec.size(); i++) {
        sum += (i & 1) ? vec[i] : (vec[i] << 8);
        if (sum & 0x80000000)
            sum = (sum & 0xFFFF) + (sum >> 16);
    }
 
    while (sum >> 16)
        sum = (sum & 0xFFFF) + (sum >> 16);
 
    return (uint16_t)sum;
}

_checksum() [2/2]

uint16_t inet::TcpIpChecksum::_checksum ( const void *  addr, unsigned int  count  )

static

{
    const uint8_t *addr = static_cast<const uint8_t *>(_addr);
    uint32_t sum = 0;
 
    while (count > 1) {
        sum += (addr[0] << 8) | addr[1];
        addr += 2;
        if (sum & 0x80000000)
            sum = (sum & 0xFFFF) + (sum >> 16);
        count -= 2;
    }
 
    if (count)
        sum += addr[0] << 8;
 
    while (sum >> 16)
        sum = (sum & 0xFFFF) + (sum >> 16);
 
    return (uint16_t)sum;
}

checksum() [1/2]

static uint16_t inet::TcpIpChecksum::checksum ( const std::vector< uint8_t > &  vec )

inlinestatic

{ return ~_checksum(vec); }

checksum() [2/2]

static uint16_t inet::TcpIpChecksum::checksum ( const void *  addr, unsigned int  count  )

inlinestatic

    {
        return ~_checksum(addr, count);
    }

Referenced by inet::CrcCheckerBase::checkComputedCrc(), inet::tcp::Tcp::checkCrc(), inet::CrcInserterBase::computeComputedCrc(), inet::tcp::TcpCrcInsertionHook::computeCrc(), inet::Pim::computeCrc(), inet::Udp::computeCrc(), inet::Ipv4Encap::encapsulate(), inet::Icmp::insertCrc(), inet::Icmpv6::insertCrc(), inet::Ipv4::insertCrc(), inet::Igmpv2::insertCrc(), inet::Igmpv3::insertCrc(), inet::Ipv4::setComputedCrc(), inet::ospfv2::setLsaCrc(), inet::ospfv2::setLsaHeaderCrc(), inet::ospfv2::setOspfCrc(), inet::Icmpv6::verifyCrc(), inet::Icmp::verifyCrc(), inet::Ipv4::verifyCrc(), inet::Igmpv2::verifyCrc(), and inet::Igmpv3::verifyCrc().

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The documentation for this class was generated from the following files:

• TcpIpChecksum.h
• TcpIpChecksum.cc