cms::CRC32Calculator Class Reference

#include <CRC32Calculator.h>

Public Member Functions
std::uint32_t	checksum ()
	CRC32Calculator (std::string const &message)

Private Attributes
std::uint32_t	checksum_

Detailed Description

Definition at line 62 of file CRC32Calculator.h.

Constructor & Destructor Documentation

cms::CRC32Calculator::CRC32Calculator

(

std::string const &

message

)

Definition at line 46 of file CRC32Calculator.cc.

References checksum_, dqmiolumiharvest::j, and AlCaHLTBitMon_ParallelJobs::p.

                                                           {
    /* initialize value */
    checksum_ = CRC32_XINIT;

    /* process each byte prior to checksum field */
    auto length = message.length();
    char const* p = message.data();
    for (size_t j = 0; j < length; j++) {
      unsigned char uc = *p++;
      checksum_ = cms::crctable[(checksum_ ^ uc) & 0xFFL] ^ (checksum_ >> 8);
    }

    /* return XOR out value */
    checksum_ = checksum_ ^ CRC32_XOROT;
  }

Member Function Documentation

std::uint32_t cms::CRC32Calculator::checksum ( )

inline

Definition at line 66 of file CRC32Calculator.h.

References checksum_.

Referenced by amc::Packet::finalize(), amc13::Packet::parse(), edm::BranchID::toID(), amc13::Trailer::writeCRC(), and amc::Trailer::writeCRC().

{ return checksum_; }

Member Data Documentation

std::uint32_t cms::CRC32Calculator::checksum_

private

Definition at line 69 of file CRC32Calculator.h.

Referenced by checksum(), and CRC32Calculator().