Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

This is the documentation for a snapshot of the develop branch, built from commit 26d7d9b59f.
PrevUpHomeNext

Pre-Defined CRC Samples

namespace boost
{
    typedef crc_optimal<16, 0x8005, 0, 0, true, true>
      crc_16_type;

    typedef crc_optimal<16, 0x1021, 0xFFFF, 0, false, false>
      crc_ccitt_false_t, crc_ccitt_type;
    typedef crc_optimal<16, 0x1021, 0, 0, true, true>  crc_ccitt_true_t;

    typedef crc_optimal<16, 0x8408, 0, 0, true, true>    crc_xmodem_type;
    typedef crc_optimal<16, 0x1021, 0, 0, false, false>  crc_xmodem_t;

    typedef crc_optimal<32, 0x04C11DB7, 0xFFFFFFFF, 0xFFFFFFFF, true, true>
      crc_32_type;
}

Several sample CRC types are given, representing common CRC algorithms. The samples have now been checked against the Catalogue of parametrised CRC algorithms, leading to some new type-aliases corresponding to the corrected profiles. (Older, incorrect profiles keep their name for backwards compatibility.) However, this library is primarily concerned with CRC implementation, and not with determining "good" sets of CRC parameters.

Table 12.4. Common CRCs

Computer Type

Standard(s)

crc_16_type

BISYNCH, ARC, LHA, ZOO

crc_ccitt_false_t

Commonly misidentified as the standard by CCITT

crc_ccitt_type

crc_ccitt_false_t (I made the same mistake.)

crc_ccitt_true_t

Designated by CCITT (Comité Consultatif International Télégraphique et Téléphonique), KERMIT

crc_xmodem_type

A mistake I didn't catch in defining crc_xmodem_t.

crc_xmodem_t

XMODEM, ZMODEM, ACORN

crc_32_type

ADCCP, PKZip, libPNG, AUTODIN II, Ethernet, FDDI



PrevUpHomeNext