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/**
* @file
* Protected interface for range differences.
*
* @author Jeremy A. Mowery jmowery@tresys.com
* @author Jason Tang jtang@tresys.com
*
* Copyright (C) 2006-2007 Tresys Technology, LLC
*
* This library 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.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef POLDIFF_RANGE_INTERNAL_H
#define POLDIFF_RANGE_INTERNAL_H
#ifdef __cplusplus
extern "C"
{
#endif
/**
* Allocate and return a poldiff_range_t object. This will fill in
* the orig_range and mod_range strings. If the form is modified,
* then this will allocate the levels vector but leave it empty.
* Otherwise the levels vector will be filled with the levels that
* were added/removed.
*
* @param diff Diff object containing policies.
* @param orig_range Range from original policy, or NULL if there is
* no original range.
* @param mod_range Range from modified policy, or NULL if there is no
* modified range.
* @param form Form of the range.
*
* @return An initialized range, or NULL upon error. Caller must call
* range_destroy() upon the returned value.
*/
poldiff_range_t *range_create(const poldiff_t * diff, const qpol_mls_range_t * orig_range,
const qpol_mls_range_t * mod_range, poldiff_form_e form);
/**
* Deallocate all space for a range, including the pointer itself.
* Afterwards set the pointer to NULL.
*
* @param range Reference to a range to destroy.
*/
void range_destroy(poldiff_range_t ** range);
/**
* Calculate the differences between two ranges (that are stored
* within the poldiff_range_t object). This involves two things:
* changes in the expanded levels, and changes to minimum category
* sets. If differences are found then the range's levels vector will
* be filled with those differences.
*
* @param diff Diff object containing policies.
* @param range Range object to diff.
*
* @return Greater than zero if a diff was found, zero if none found,
* less than zero for errors.
*/
int range_deep_diff(poldiff_t * diff, poldiff_range_t * range);
#ifdef __cplusplus
}
#endif
#endif /* POLDIFF_RANGE_INTERNAL_H */
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