1 // Copyright (C) 1999,2000 Bruce Guenter <bruceg@em.ca>

     2 //

     3 // This program is free software; you can redistribute it and/or modify

     4 // it under the terms of the GNU General Public License as published by

     5 // the Free Software Foundation; either version 2 of the License, or

     6 // (at your option) any later version.

     7 //

     8 // This program is distributed in the hope that it will be useful,

     9 // but WITHOUT ANY WARRANTY; without even the implied warranty of

    10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    11 // GNU General Public License for more details.

    12 //

    13 // You should have received a copy of the GNU General Public License

    14 // along with this program; if not, write to the Free Software

    15 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    16 

    17 #include <config.h>

    18 #include "vdomain.h"

    19 #include "misc/crc_hash.h"

    20 

    21 mystring vdomain::userdir(mystring username) const

    22 {

    23   unsigned slices = config.user_dir_slices();

    24   unsigned bits = config.user_dir_bits();

    25   static crc_hash hasher;

    26   static const char bin2hex[16+1] = "0123456789abcdef";

    27   unsigned hash = hasher(username);

    28   mystring dir = config.user_dir();

    29   const unsigned hexdigits = (bits+3)/4;

    30   const unsigned bitmask = ~(~0U << bits);

    31   char hexbuf[hexdigits+1];

    32   hexbuf[hexdigits] = 0;

    33   for(; slices > 0; --slices, hash >>= bits) {

    34     unsigned slice = hash & bitmask;

    35     for(unsigned i = hexdigits; i > 0; --i, slice >>= 4)

    36       hexbuf[i-1] = bin2hex[slice & 0xf];

    37     dir += hexbuf;

    38     dir += "/";

    39   }

    40   dir += username.subst('.', ':');

    41   if(!!subdir)

    42     dir = subdir + "/" + dir;

    43   return dir;

    44 }