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/**
* @file
* Protected interface for class and common 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_CLASS_INTERNAL_H
#define POLDIFF_CLASS_INTERNAL_H
#ifdef __cplusplus
extern "C"
{
#endif
/******************** object classes ********************/
typedef struct poldiff_class_summary poldiff_class_summary_t;
/**
* Allocate and return a new poldiff_class_summary_t object.
*
* @return A new class summary. The caller must call class_destroy()
* afterwards. On error, return NULL and set errno.
*/
poldiff_class_summary_t *class_create(void);
/**
* Deallocate all space associated with a poldiff_class_summary_t
* object, including the pointer itself. If the pointer is already
* NULL then do nothing.
*
* @param cs Reference to a class summary to destroy. The pointer
* will be set to NULL afterwards.
*/
void class_destroy(poldiff_class_summary_t ** cs);
/**
* Reset the state of all class 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 class_reset(poldiff_t * diff);
/**
* Get a vector of all object classes (type qpol_class_t) 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 classes. The caller is
* responsible for calling apol_vector_destroy() afterwards. On
* error, return NULL and set errno.
*/
apol_vector_t *class_get_items(poldiff_t * diff, const apol_policy_t * policy);
/**
* Compare two qpol_class_t objects, determining if they have the same
* name or not.
*
* @param x The class from the original policy.
* @param y The class from the modified policy.
* @param diff The policy difference structure associated with both
* policies.
*
* @return < 0, 0, or > 0 if class x is respectively less than, equal
* to, or greater than class y.
*/
int class_comp(const void *x, const void *y, const poldiff_t * diff);
/**
* Create, initialize, and insert a new semantic difference entry for
* a class.
*
* @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 class_new_diff(poldiff_t * diff, poldiff_form_e form, const void *item);
/**
* Compute the semantic difference of two classes for which the
* compare callback returns 0. If a difference is found then
* allocate, initialize, and insert a new semantic difference entry
* for that class.
*
* @param diff The policy difference structure associated with both
* classes and to which to add an entry if needed.
* @param x The class from the original policy.
* @param y The class from the modified policy.
*
* @return 0 on success and < 0 on error; if the call fails, set errno
* and leave the policy difference structure unchanged.
*/
int class_deep_diff(poldiff_t * diff, const void *x, const void *y);
/******************** common classes ********************/
typedef struct poldiff_common_summary poldiff_common_summary_t;
/**
* Allocate and return a new poldiff_common_summary_t object.
*
* @return A new common summary. The caller must call
* common_destroy() afterwards. On error, return NULL and set errno.
*/
poldiff_common_summary_t *common_create(void);
/**
* Deallocate all space associated with a poldiff_common_summary_t
* object, including the pointer itself. If the pointer is already
* NULL then do nothing.
*
* @param cs Reference to a common summary to destroy. The pointer
* will be set to NULL afterwards.
*/
void common_destroy(poldiff_common_summary_t ** cs);
/**
* Reset the state of all common 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 common_reset(poldiff_t * diff);
/**
* Get a vector of all common classes (type qpol_common_t) 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 commons. The caller is
* responsible for calling apol_vector_destroy() afterwards. On
* error, return NULL and set errno.
*/
apol_vector_t *common_get_items(poldiff_t * diff, const apol_policy_t * policy);
/**
* Compare two qpol_common_t objects, determining if they have the
* same name or not.
*
* @param x The common from the original policy.
* @param y The common from the modified policy.
* @param diff The policy difference structure associated with both
* policies.
*
* @return < 0, 0, or > 0 if common x is respectively less than, equal
* to, or greater than common y.
*/
int common_comp(const void *x, const void *y, const poldiff_t * diff);
/**
* Create, initialize, and insert a new semantic difference entry for
* a common.
*
* @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 common_new_diff(poldiff_t * diff, poldiff_form_e form, const void *item);
/**
* Compute the semantic difference of two commons for which the
* compare callback returns 0. If a difference is found then
* allocate, initialize, and insert a new semantic difference entry
* for that common.
*
* @param diff The policy difference structure associated with both
* commons and to which to add an entry if needed.
* @param x The common from the original policy.
* @param y The common from the modified policy.
*
* @return 0 on success and < 0 on error; if the call fails, set errno
* and leave the policy difference structure unchanged.
*/
int common_deep_diff(poldiff_t * diff, const void *x, const void *y);
#ifdef __cplusplus
}
#endif
#endif /* POLDIFF_CLASS_INTERNAL_H */
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