/usr/include/apt-pkg/crc-16.h is in libapt-pkg-dev 0.8.16~exp12ubuntu10.21.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | // -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
// $Id: crc-16.h,v 1.1 1999/05/23 22:55:54 jgg Exp $
/* ######################################################################
CRC16 - Compute a 16bit crc very quickly
##################################################################### */
/*}}}*/
#ifndef APTPKG_CRC16_H
#define APTPKG_CRC16_H
#define INIT_FCS 0xffff
unsigned short AddCRC16(unsigned short fcs, void const *buf,
unsigned long long len);
#endif
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