cet::crc32 Class Reference

#include <crc32.h>

Public Types
using	uchar = unsigned char
using	digest_t = std::uint32_t

Public Member Functions
constexpr	crc32 ()=default
constexpr	crc32 (char const *mesg)
constexpr	crc32 (char const mesg)
	crc32 (std::string const &mesg)
constexpr crc32 &	operator<< (char const *mesg)
constexpr crc32 &	operator<< (char const mesg)
crc32 &	operator<< (std::string const &mesg)
constexpr digest_t	digest () const

Static Private Member Functions
static constexpr std::uint32_t	crc32_xorot ()

Private Attributes
digest_t	context {0xFFFFFFFFL}

Static Private Attributes
static constexpr std::uint32_t	crctable [256]

Detailed Description

Definition at line 19 of file crc32.h.

Member Typedef Documentation

using cet::crc32::digest_t = std::uint32_t

Definition at line 22 of file crc32.h.

using cet::crc32::uchar = unsigned char

Definition at line 21 of file crc32.h.

Constructor & Destructor Documentation

constexpr cet::crc32::crc32 ( )

default

constexpr cet::crc32::crc32 ( char const *  mesg )

explicit

Definition at line 107 of file crc32.h.

{
  operator<<(mesg);
}

constexpr cet::crc32::crc32 ( char const  mesg )

explicit

Definition at line 112 of file crc32.h.

{
  operator<<(mesg);
}

crc32::crc32 ( std::string const &  mesg )

explicit

Definition at line 50 of file crc32.cc.

{
  operator<<(mesg);
}

Member Function Documentation

static constexpr std::uint32_t cet::crc32::crc32_xorot ( )

inlinestaticprivate

Definition at line 43 of file crc32.h.

  {
    return 0xFFFFFFFFL;
  }

constexpr cet::crc32::digest_t cet::crc32::digest

(

)

const

Definition at line 138 of file crc32.h.

{
  return context ^ crc32_xorot();
}

constexpr cet::crc32 & cet::crc32::operator<<

(

char const *

mesg

)

Definition at line 119 of file crc32.h.

{
  unsigned i{};
  while (mesg[i] != '\0') {
    operator<<(mesg[i]);
    ++i;
  }
  return *this;
}

constexpr cet::crc32 & cet::crc32::operator<<

(

char const

mesg

)

Definition at line 130 of file crc32.h.

{
  uchar const ch = mesg;
  context = crctable[(context ^ ch) & 0xFFL] ^ (context >> 8);
  return *this;
}

crc32 & crc32::operator<<

(

std::string const &

mesg

)

Definition at line 56 of file crc32.cc.

{
  for (uchar const ch : mesg) {
    context = crctable[(context ^ ch) & 0xFFL] ^ (context >> 8);
  }
  return *this;
}

Member Data Documentation

digest_t cet::crc32::context {0xFFFFFFFFL}

private

Definition at line 39 of file crc32.h.

constexpr std::uint32_t cet::crc32::crctable

staticprivate

Definition at line 47 of file crc32.h.

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

• cetlib/cetlib/crc32.h
• cetlib/cetlib/crc32.cc