ShortIdBlock.C

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// Copyright (C) 2001, Compaq Computer Corporation
// 
// This file is part of Vesta.
// 
// Vesta is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// 
// Vesta 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
// Lesser General Public License for more details.
// 
// You should have received a copy of the GNU Lesser General Public
// License along with Vesta; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

//
// ShortIdBlock.C
// Last modified on Fri Apr 22 12:32:16 EDT 2005 by ken@xorian.net  
//      modified on Fri Jul 27 18:24:29 PDT 2001 by mann  
//      modified on Tue May  4 10:50:07 PDT 1999 by heydon
//
// Implementation for ShortIdBlock.H
// 

#include "ShortIdBlock.H"
#include "VestaConfig.H"
#include "Basics.H"
#include <stdio.h>

using std::cerr;
using std::endl;

static Text sid_dir;
static int sid_dir_len;
static pthread_once_t once = PTHREAD_ONCE_INIT;

extern "C"
{
  static void
  ShortIdBlockInit()
  {
    try {
        bool ok = VestaConfig::get("Repository", "sid_dir", sid_dir);
        if (!ok) sid_dir = "";
        sid_dir_len = sid_dir.Length();
    } catch (VestaConfig::failure f) {
        cerr << "VestaConfig::failure " << f.msg << endl;
        throw; // likely to be uncaught and fatal
    }
  }
}

// This method is local
ShortId ShortIdBlock::assignNextAvail() throw ()
{
    for (;;) {
        if (next >= start + size) {
            return NullShortId;
        } else if (!assigned(next)) {
            set(next);
            return next++;
        } else {
            next++;
        }
    }
}

char* ShortIdBlock::shortIdToName(ShortId sid, const char* prepend) throw ()
{
    // The encoding of ShortId as filename is hard-coded here,
    // relative to the current process working directory.  See also
    // DeleteAllShortIdsBut in ShortIdImpl.C, and note that
    // ShortIdBlock::size must be equal to the range of the last
    // pathname component (i.e., 0x100 if the last component is sid &
    // 0xff).
    //
    pthread_once(&once, ShortIdBlockInit);
    char* retval = NEW_PTRFREE_ARRAY(char, sid_dir_len + strlen(prepend) + 11);
    sprintf(retval, "%s%s%03x%c%03x%c%02x",
            prepend, sid_dir.cchars(),
            (sid >> 20) & 0xfff, PathnameSep,
            (sid >> 8) & 0xfff,  PathnameSep,
            sid & 0xff);
    return retval;
}

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