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/* id.h : interface to FSX-internal ID functions
*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
* ====================================================================
*/
#ifndef SVN_LIBSVN_FS_X_ID_H
#define SVN_LIBSVN_FS_X_ID_H
#include "svn_fs.h"
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/* Unique identifier for a transaction within the given repository. */
typedef apr_int64_t svn_fs_x__txn_id_t;
/* svn_fs_x__txn_id_t value for everything that is not a transaction. */
#define SVN_FS_X__INVALID_TXN_ID ((svn_fs_x__txn_id_t)(-1))
/* Change set is the umbrella term for transaction and revision in FSX.
* Revision numbers (>=0) map 1:1 onto change sets while txns are mapped
* onto the negatve value range. */
typedef apr_int64_t svn_fs_x__change_set_t;
/* Invalid / unused change set number. */
#define SVN_FS_X__INVALID_CHANGE_SET ((svn_fs_x__change_set_t)(-1))
/* Return TRUE iff the CHANGE_SET refers to a revision
(will return FALSE for SVN_INVALID_REVNUM). */
svn_boolean_t
svn_fs_x__is_revision(svn_fs_x__change_set_t change_set);
/* Return TRUE iff the CHANGE_SET refers to a transaction
(will return FALSE for SVN_FS_X__INVALID_TXN_ID). */
svn_boolean_t
svn_fs_x__is_txn(svn_fs_x__change_set_t change_set);
/* Return the revision number that corresponds to CHANGE_SET.
Will SVN_INVALID_REVNUM for transactions. */
svn_revnum_t
svn_fs_x__get_revnum(svn_fs_x__change_set_t change_set);
/* Return the transaction ID that corresponds to CHANGE_SET.
Will SVN_FS_X__INVALID_TXN_ID for revisions. */
svn_fs_x__txn_id_t
svn_fs_x__get_txn_id(svn_fs_x__change_set_t change_set);
/* Convert REVNUM into a change set number */
svn_fs_x__change_set_t
svn_fs_x__change_set_by_rev(svn_revnum_t revnum);
/* Convert TXN_ID into a change set number */
svn_fs_x__change_set_t
svn_fs_x__change_set_by_txn(svn_fs_x__txn_id_t txn_id);
/* An ID in FSX consists of a creation CHANGE_SET number and some changeset-
* local counter value (NUMBER).
*/
typedef struct svn_fs_x__id_t
{
svn_fs_x__change_set_t change_set;
apr_uint64_t number;
} svn_fs_x__id_t;
/*** Operations on ID parts. ***/
/* Return TRUE, if both elements of the PART is 0, i.e. this is the default
* value if e.g. no copies were made of this node. */
svn_boolean_t
svn_fs_x__id_is_root(const svn_fs_x__id_t *part);
/* Return TRUE, if all element values of *LHS and *RHS match. */
svn_boolean_t
svn_fs_x__id_eq(const svn_fs_x__id_t *lhs,
const svn_fs_x__id_t *rhs);
/* Parse the NUL-terminated ID part at DATA and write the result into *PART.
*/
svn_error_t *
svn_fs_x__id_parse(svn_fs_x__id_t *part,
const char *data);
/* Convert ID into string form, allocated in RESULT_POOL. */
svn_string_t *
svn_fs_x__id_unparse(const svn_fs_x__id_t*id,
apr_pool_t *result_pool);
/* Set *PART to "unused". */
void
svn_fs_x__id_reset(svn_fs_x__id_t *part);
/* Return TRUE if *PART is belongs to either a revision or transaction. */
svn_boolean_t
svn_fs_x__id_used(const svn_fs_x__id_t *part);
/* Return 0 if A and B are equal, 1 if A is "greater than" B, -1 otherwise. */
int
svn_fs_x__id_compare(const svn_fs_x__id_t *a,
const svn_fs_x__id_t *b);
/* Set *NODEREV_ID to the root node ID of transaction TXN_ID. */
void
svn_fs_x__init_txn_root(svn_fs_x__id_t *noderev_id,
svn_fs_x__txn_id_t txn_id);
/* Set *NODEREV_ID to the root node ID of revision REV. */
void
svn_fs_x__init_rev_root(svn_fs_x__id_t *noderev_id,
svn_revnum_t rev);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* SVN_LIBSVN_FS_X_ID_H */
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