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

//

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

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

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

// (at your option) any later version.

//

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

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

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

// GNU General Public License for more details.

//

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

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

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

#include <config.h>

#include "vdomain.h"

#include "misc/crc_hash.h"

mystring vdomain::userdir(mystring username) const

{

  unsigned slices = config.user_dir_slices();

  unsigned bits = config.user_dir_bits();

  static crc_hash hasher;

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

  unsigned hash = hasher(username);

  mystring dir = config.user_dir();

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

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

  char hexbuf[hexdigits+1];

  hexbuf[hexdigits] = 0;

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

    unsigned slice = hash & bitmask;

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

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

    dir += hexbuf;

    dir += "/";

  }

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

  if(!!subdir)

    dir = subdir + "/" + dir;

  return dir;

}