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/**
* @file
* Protected interface for computing semantic differences in
* categories.
*
* @author Jeremy A. Mowery jmowery@tresys.com
* @author Jason Tang jtang@tresys.com
*
* Copyright (C) 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_CAT_INTERNAL_H
#define POLDIFF_CAT_INTERNAL_H
#ifdef __cplusplus
extern "C"
{
#endif
typedef struct poldiff_cat_summary poldiff_cat_summary_t;
/**
* Allocate and return a new poldiff_cat_summary_t object.
*
* @return A new category summary. The caller must call cat_destroy()
* afterwards. On error, return NULL and set errno.
*/
poldiff_cat_summary_t *cat_create(void);
/**
* Deallocate all space associated with a poldiff_cat_summary_t
* object, including the pointer itself. If the pointer is already
* NULL then do nothing.
*
* @param cs Reference to a category summary to destroy. The pointer
* will be set to NULL afterwards.
*/
void cat_destroy(poldiff_cat_summary_t ** cs);
/**
* Reset the state of all category differences.
* @param diff The policy difference structure containing the differences
* to reset.
* @return 0 on success and < 0 on error; if the call fails,
* errno will be set and the user should call poldiff_destroy() on diff.
*/
int cat_reset(poldiff_t * diff);
/**
* Get a vector of all categoriess from the given policy, sorted by name.
*
* @param diff Policy diff error handler.
* @param policy The policy from which to get the items.
*
* @return a newly allocated vector of all categories. The caller is
* responsible for calling apol_vector_destroy() afterwards. On
* error, return NULL and set errno.
*/
apol_vector_t *cat_get_items(poldiff_t * diff, const apol_policy_t * policy);
/**
* Compare two qpol_cat_t objects, determining if they have the same
* level name or not.
*
* @param x The category from the original policy.
* @param y The category from the modified policy.
* @param diff The policy difference structure associated with both
* policies.
*
* @return < 0, 0, or > 0 if category x is respectively less than, equal
* to, or greater than category y.
*/
int cat_comp(const void *x, const void *y, const poldiff_t * diff);
/**
* Create, initialize, and insert a new semantic difference entry for
* a category.
*
* @param diff The policy difference structure to which to add the entry.
* @param form The form of the difference.
* @param item Item for which the entry is being created.
*
* @return 0 on success and < 0 on error; if the call fails, set errno
* and leave the policy difference structure unchanged.
*/
int cat_new_diff(poldiff_t * diff, poldiff_form_e form, const void *item);
/**
* Compute the semantic difference of two categories for which the compare
* callback returns 0. Categories cannot be modified only added or removed.
* This function always returns 0.
*
* @param diff The policy difference structure associated with both
* categories.
* @param x The category from the original policy.
* @param y The category from the modified policy.
*
* @return always 0.
*/
int cat_deep_diff(poldiff_t * diff, const void *x, const void *y);
#ifdef __cplusplus
}
#endif
#endif /* POLDIFF_CAT_INTERNAL_H */
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