1 /* id.c : implements FSX-internal ID functions
3 * ====================================================================
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
12 * http://www.apache.org/licenses/LICENSE-2.0
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
20 * ====================================================================
29 #include "private/svn_string_private.h"
34 svn_fs_x__is_txn(svn_fs_x__change_set_t change_set)
36 return change_set < SVN_FS_X__INVALID_CHANGE_SET;
40 svn_fs_x__is_revision(svn_fs_x__change_set_t change_set)
42 return change_set > SVN_FS_X__INVALID_CHANGE_SET;
46 svn_fs_x__get_revnum(svn_fs_x__change_set_t change_set)
48 return svn_fs_x__is_revision(change_set)
49 ? (svn_revnum_t)change_set
54 svn_fs_x__get_txn_id(svn_fs_x__change_set_t change_set)
56 return svn_fs_x__is_txn(change_set)
57 ? -change_set + SVN_FS_X__INVALID_CHANGE_SET -1
58 : SVN_FS_X__INVALID_TXN_ID;
62 svn_fs_x__change_set_t
63 svn_fs_x__change_set_by_rev(svn_revnum_t revnum)
65 assert(revnum >= SVN_FS_X__INVALID_CHANGE_SET);
69 svn_fs_x__change_set_t
70 svn_fs_x__change_set_by_txn(apr_int64_t txn_id)
72 assert(txn_id >= SVN_FS_X__INVALID_CHANGE_SET);
73 return -txn_id + SVN_FS_X__INVALID_CHANGE_SET -1;
77 /* Parse the NUL-terminated ID part at DATA and write the result into *PART.
78 * Return TRUE if no errors were detected. */
80 part_parse(svn_fs_x__id_t *part,
83 part->number = svn__base36toui64(&data, data);
87 case '-': part->change_set = -svn__base36toui64(&data, data + 1);
90 /* revision number? */
91 case '+': part->change_set = svn__base36toui64(&data, data + 1);
94 /* everything else is forbidden */
95 default: return FALSE;
99 /* Write the textual representation of *PART into P and return a pointer
100 * to the first position behind that string.
103 part_unparse(char *p,
104 const svn_fs_x__id_t *part)
106 p += svn__ui64tobase36(p, part->number);
107 if (part->change_set >= 0)
110 p += svn__ui64tobase36(p, part->change_set);
115 p += svn__ui64tobase36(p, -part->change_set);
123 /* Operations on ID parts */
126 svn_fs_x__id_is_root(const svn_fs_x__id_t* part)
128 return part->change_set == 0 && part->number == 0;
132 svn_fs_x__id_eq(const svn_fs_x__id_t *lhs,
133 const svn_fs_x__id_t *rhs)
135 return lhs->change_set == rhs->change_set && lhs->number == rhs->number;
139 svn_fs_x__id_parse(svn_fs_x__id_t *part,
142 if (!part_parse(part, data))
143 return svn_error_createf(SVN_ERR_FS_MALFORMED_NODEREV_ID, NULL,
144 "Malformed ID string");
150 svn_fs_x__id_unparse(const svn_fs_x__id_t *id,
151 apr_pool_t *result_pool)
153 char string[2 * SVN_INT64_BUFFER_SIZE + 1];
154 char *p = part_unparse(string, id);
156 return svn_string_ncreate(string, p - string, result_pool);
160 svn_fs_x__id_reset(svn_fs_x__id_t *part)
162 part->change_set = SVN_FS_X__INVALID_CHANGE_SET;
167 svn_fs_x__id_used(const svn_fs_x__id_t *part)
169 return part->change_set != SVN_FS_X__INVALID_CHANGE_SET;
173 svn_fs_x__init_txn_root(svn_fs_x__id_t *noderev_id,
174 svn_fs_x__txn_id_t txn_id)
176 noderev_id->change_set = svn_fs_x__change_set_by_txn(txn_id);
177 noderev_id->number = SVN_FS_X__ITEM_INDEX_ROOT_NODE;
181 svn_fs_x__init_rev_root(svn_fs_x__id_t *noderev_id,
184 noderev_id->change_set = svn_fs_x__change_set_by_rev(rev);
185 noderev_id->number = SVN_FS_X__ITEM_INDEX_ROOT_NODE;
189 svn_fs_x__id_compare(const svn_fs_x__id_t *a,
190 const svn_fs_x__id_t *b)
192 if (a->change_set < b->change_set)
194 if (a->change_set > b->change_set)
197 return a->number < b->number ? -1 : a->number == b->number ? 0 : 1;