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/*
** SWISH++
** index_segment.c
**
** Copyright (C) 1998 Paul J. Lucas
**
** 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
// local
#include "index_segment.h"
using namespace PJL;
//*****************************************************************************
//
// SYNOPSIS
//
void index_segment::set_index_file(
mmap_file const &file, segment_id id
)
//
// DESCRIPTION
//
// Set the index file to use by setting data members to the proper
// positions within the index file.
//
// CAVEAT
//
// Ideally, this function would be part of the constructor, but the name
// of the index file can be passed in via the command line and that isn't
// parsed until after the instance is constructed.
//
// SEE ALSO
//
// index.c write_full_index() -- format of index file
//
//*****************************************************************************
{
register mmap_file::const_iterator c = begin_ = file.begin();
register size_type const *p = reinterpret_cast<size_type const*>( c );
num_entries_ = p[ 0 ];
for ( int i = id; i > 0; --i ) {
c += sizeof( num_entries_ ) + num_entries_ * sizeof( off_t );
p = reinterpret_cast<size_type const*>( c );
num_entries_ = p[ 0 ];
}
offset_ = reinterpret_cast<off_t const*>( &p[ 1 ] );
}
/* vim:set et sw=4 ts=4: */
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