id.c revision 299742 
1/* id.c : operations on node-revision IDs
2 *
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
11 *
12 *      http://www.apache.org/licenses/LICENSE-2.0
13 *
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
19 *    under the License.
20 * ====================================================================
21 */
22
23#include <string.h>
24#include <stdlib.h>
25
26#include "id.h"
27#include "../libsvn_fs/fs-loader.h"
28
29
30
31typedef struct id_private_t {
32  const char *node_id;
33  const char *copy_id;
34  const char *txn_id;
35} id_private_t;
36
37
38/* Accessing ID Pieces.  */
39
40const char *
41svn_fs_base__id_node_id(const svn_fs_id_t *id)
42{
43  id_private_t *pvt = id->fsap_data;
44
45  return pvt->node_id;
46}
47
48
49const char *
50svn_fs_base__id_copy_id(const svn_fs_id_t *id)
51{
52  id_private_t *pvt = id->fsap_data;
53
54  return pvt->copy_id;
55}
56
57
58const char *
59svn_fs_base__id_txn_id(const svn_fs_id_t *id)
60{
61  id_private_t *pvt = id->fsap_data;
62
63  return pvt->txn_id;
64}
65
66
67svn_string_t *
68svn_fs_base__id_unparse(const svn_fs_id_t *id,
69                        apr_pool_t *pool)
70{
71  id_private_t *pvt = id->fsap_data;
72
73  return svn_string_createf(pool, "%s.%s.%s",
74                            pvt->node_id, pvt->copy_id, pvt->txn_id);
75}
76
77
78/*** Comparing node IDs ***/
79
80svn_boolean_t
81svn_fs_base__id_eq(const svn_fs_id_t *a,
82                   const svn_fs_id_t *b)
83{
84  id_private_t *pvta = a->fsap_data, *pvtb = b->fsap_data;
85
86  if (a == b)
87    return TRUE;
88  if (strcmp(pvta->node_id, pvtb->node_id) != 0)
89     return FALSE;
90  if (strcmp(pvta->copy_id, pvtb->copy_id) != 0)
91    return FALSE;
92  if (strcmp(pvta->txn_id, pvtb->txn_id) != 0)
93    return FALSE;
94  return TRUE;
95}
96
97
98svn_boolean_t
99svn_fs_base__id_check_related(const svn_fs_id_t *a,
100                              const svn_fs_id_t *b)
101{
102  id_private_t *pvta = a->fsap_data, *pvtb = b->fsap_data;
103
104  if (a == b)
105    return TRUE;
106
107  return (strcmp(pvta->node_id, pvtb->node_id) == 0);
108}
109
110
111svn_fs_node_relation_t
112svn_fs_base__id_compare(const svn_fs_id_t *a,
113                        const svn_fs_id_t *b)
114{
115  if (svn_fs_base__id_eq(a, b))
116    return svn_fs_node_unchanged;
117  return (svn_fs_base__id_check_related(a, b) ? svn_fs_node_common_ancestor
118                                              : svn_fs_node_unrelated);
119}
120
121
122
123/* Creating ID's.  */
124
125static id_vtable_t id_vtable = {
126  svn_fs_base__id_unparse,
127  svn_fs_base__id_compare
128};
129
130
131svn_fs_id_t *
132svn_fs_base__id_create(const char *node_id,
133                       const char *copy_id,
134                       const char *txn_id,
135                       apr_pool_t *pool)
136{
137  svn_fs_id_t *id = apr_palloc(pool, sizeof(*id));
138  id_private_t *pvt = apr_palloc(pool, sizeof(*pvt));
139
140  pvt->node_id = apr_pstrdup(pool, node_id);
141  pvt->copy_id = apr_pstrdup(pool, copy_id);
142  pvt->txn_id = apr_pstrdup(pool, txn_id);
143  id->vtable = &id_vtable;
144  id->fsap_data = pvt;
145  return id;
146}
147
148
149svn_fs_id_t *
150svn_fs_base__id_copy(const svn_fs_id_t *id, apr_pool_t *pool)
151{
152  svn_fs_id_t *new_id = apr_palloc(pool, sizeof(*new_id));
153  id_private_t *new_pvt = apr_palloc(pool, sizeof(*new_pvt));
154  id_private_t *pvt = id->fsap_data;
155
156  new_pvt->node_id = apr_pstrdup(pool, pvt->node_id);
157  new_pvt->copy_id = apr_pstrdup(pool, pvt->copy_id);
158  new_pvt->txn_id = apr_pstrdup(pool, pvt->txn_id);
159  new_id->vtable = &id_vtable;
160  new_id->fsap_data = new_pvt;
161  return new_id;
162}
163
164
165svn_fs_id_t *
166svn_fs_base__id_parse(const char *data,
167                      apr_size_t len,
168                      apr_pool_t *pool)
169{
170  svn_fs_id_t *id;
171  id_private_t *pvt;
172  char *data_copy, *str;
173
174  /* Dup the ID data into POOL.  Our returned ID will have references
175     into this memory. */
176  data_copy = apr_pstrmemdup(pool, data, len);
177
178  /* Alloc a new svn_fs_id_t structure. */
179  id = apr_palloc(pool, sizeof(*id));
180  pvt = apr_palloc(pool, sizeof(*pvt));
181  id->vtable = &id_vtable;
182  id->fsap_data = pvt;
183
184  /* Now, we basically just need to "split" this data on `.'
185     characters.  We will use svn_cstring_tokenize, which will put
186     terminators where each of the '.'s used to be.  Then our new
187     id field will reference string locations inside our duplicate
188     string.*/
189
190  /* Node Id */
191  str = svn_cstring_tokenize(".", &data_copy);
192  if (str == NULL)
193    return NULL;
194  pvt->node_id = str;
195
196  /* Copy Id */
197  str = svn_cstring_tokenize(".", &data_copy);
198  if (str == NULL)
199    return NULL;
200  pvt->copy_id = str;
201
202  /* Txn Id */
203  str = svn_cstring_tokenize(".", &data_copy);
204  if (str == NULL)
205    return NULL;
206  pvt->txn_id = str;
207
208  return id;
209}
210