1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
|
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* Copyright by the Board of Trustees of the University of Illinois. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the COPYING file, which can be found at the root of the source code *
* distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#include "h5tools_ref.h"
#include "H5private.h"
#include "H5SLprivate.h"
#include "h5tools.h"
#include "h5tools_utils.h"
#include "h5trav.h"
/*
* Table to look up a path name for an object
* reference.
*
* This table stores mappings of reference -> path
* for all objects in the file that may be the target of
* an object reference.
*
* The 'path' is an absolute path by which the object
* can be accessed. When an object has > 1 such path,
* only one will be used in the table, with no particular
* method of selecting which one.
*/
typedef struct {
haddr_t objno; /* Object ID (i.e. address) */
char *path; /* Object path */
} ref_path_node_t;
static H5SL_t *ref_path_table = NULL; /* the "table" (implemented with a skip list) */
static hid_t thefile = (-1);
static int ref_path_table_put(const char *, haddr_t objno);
/*-------------------------------------------------------------------------
* Function: free_ref_path_info
*
* Purpose: Free the key for a reference path table node
*
* Return: Non-negative on success, negative on failure
*
* Programmer: Quincey Koziol
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static herr_t
free_ref_path_info(void *item, void H5_ATTR_UNUSED *key, void H5_ATTR_UNUSED *operator_data/*in,out*/)
{
ref_path_node_t *node = (ref_path_node_t *)item;
HDfree(node->path);
HDfree(node);
return(0);
}
/*-------------------------------------------------------------------------
* Function: init_ref_path_cb
*
* Purpose: Called by interator to create references for
* all objects and enter them in the table.
*
* Return: Error status.
*
* Programmer: REMcG
*
*-------------------------------------------------------------------------
*/
static herr_t
init_ref_path_cb(const char *obj_name, const H5O_info_t *oinfo,
const char *already_seen, void H5_ATTR_UNUSED *_udata)
{
/* Check if the object is already in the path table */
if(NULL == already_seen) {
/* Insert the object into the path table */
ref_path_table_put(obj_name, oinfo->addr);
} /* end if */
return 0;
}
/*-------------------------------------------------------------------------
* Function: init_ref_path_table
*
* Purpose: Initalize the reference path table
*
* Return: Non-negative on success, negative on failure
*
* Programmer: Quincey Koziol
*
*-------------------------------------------------------------------------
*/
static int
init_ref_path_table(void)
{
/* Sanity check */
HDassert(thefile > 0);
/* Create skip list to store reference path information */
if((ref_path_table = H5SL_create(H5SL_TYPE_HADDR, NULL))==NULL)
return (-1);
/* Iterate over objects in this file */
if(h5trav_visit(thefile, "/", TRUE, TRUE, init_ref_path_cb, NULL, NULL) < 0) {
error_msg("unable to construct reference path table\n");
h5tools_setstatus(EXIT_FAILURE);
} /* end if */
return(0);
}
/*-------------------------------------------------------------------------
* Function: term_ref_path_table
*
* Purpose: Terminate the reference path table
*
* Return: Non-negative on success, negative on failure
*
* Programmer: Quincey Koziol
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
int
term_ref_path_table(void)
{
/* Destroy reference path table, freeing all memory */
if(ref_path_table)
H5SL_destroy(ref_path_table, free_ref_path_info, NULL);
return(0);
}
/*-------------------------------------------------------------------------
* Function: ref_path_table_lookup
*
* Purpose: Looks up a table entry given a path name.
* Used during construction of the table.
*
* Return: The table entre (pte) or NULL if not in the
* table.
*
* Programmer: REMcG
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
haddr_t
ref_path_table_lookup(const char *thepath)
{
H5O_info_t oi;
if((HDstrlen(thepath) == 0) || (thepath == NULL))
return HADDR_UNDEF;
/* Allow lookups on the root group, even though it doesn't have any link info */
if(HDstrcmp(thepath, "/")) {
H5L_info_t li;
/* Check for external link first, so we don't return the OID of an object in another file */
if(H5Lget_info(thefile, thepath, &li, H5P_DEFAULT) < 0)
return HADDR_UNDEF;
/* UD links can't be followed, so they always "dangle" like soft links. */
if(li.type >= H5L_TYPE_UD_MIN)
return HADDR_UNDEF;
} /* end if */
/* Get the object info now */
/* (returns failure for dangling soft links) */
if(H5Oget_info_by_name(thefile, thepath, &oi, H5P_DEFAULT) < 0)
return HADDR_UNDEF;
/* Return OID */
return(oi.addr);
}
/*-------------------------------------------------------------------------
* Function: ref_path_table_put
*
* Purpose: Enter the 'obj' with 'path' in the table (assumes its not
* already there)
*
* Create an object reference, pte, and store them
* in the table.
*
* NOTE: Takes ownership of the path name string passed in!
*
* Return: Non-negative on success, negative on failure
*
* Programmer: REMcG
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static int
ref_path_table_put(const char *path, haddr_t objno)
{
ref_path_node_t *new_node;
HDassert(ref_path_table);
HDassert(path);
if((new_node = (ref_path_node_t *)HDmalloc(sizeof(ref_path_node_t))) == NULL)
return(-1);
new_node->objno = objno;
new_node->path = HDstrdup(path);
return(H5SL_insert(ref_path_table, new_node, &(new_node->objno)));
}
/*
* counter used to disambiguate multiple instances of same object.
*/
int xid = 1;
int get_next_xid(void) {
return xid++;
}
/*
* This counter is used to create fake object ID's
* The idea is to set it to the largest possible offest, which
* minimizes the chance of collision with a real object id.
*
*/
haddr_t fake_xid = HADDR_MAX;
haddr_t
get_fake_xid (void) {
return (fake_xid--);
}
/*
* for an object that does not have an object id (e.g., soft link),
* create a table entry with a fake object id as the key.
*
* Assumes 'path' is for an object that is not in the table.
*
*/
haddr_t
ref_path_table_gen_fake(const char *path)
{
haddr_t fake_objno;
/* Generate fake ID for string */
fake_objno = get_fake_xid();
/* Create ref path table, if it hasn't already been created */
if(ref_path_table == NULL)
init_ref_path_table();
/* Insert "fake" object into table */
ref_path_table_put(path, fake_objno);
return(fake_objno);
}
/*-------------------------------------------------------------------------
* Function: lookup_ref_path
*
* Purpose: Lookup the path to the object with refernce 'ref'.
*
* Return: Return a path to the object, or NULL if not found.
*
* Programmer: REMcG
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
const char *
lookup_ref_path(haddr_t ref)
{
ref_path_node_t *node;
/* Be safer for h5ls */
if(thefile < 0)
return(NULL);
/* Create ref path table, if it hasn't already been created */
if(ref_path_table == NULL)
init_ref_path_table();
node = (ref_path_node_t *)H5SL_search(ref_path_table, &ref);
return(node ? node->path : NULL);
}
/*-------------------------------------------------------------------------
* Function: fill_ref_path_table
*
* Purpose: Called by interator to create references for
* all objects and enter them in the table.
*
* Return: Error status.
*
* Programmer: REMcG
*
*-------------------------------------------------------------------------
*/
herr_t
fill_ref_path_table(hid_t fid)
{
/* Set file ID for later queries (XXX: this should be fixed) */
thefile = fid;
/* Defer creating the ref path table until it's needed */
return 0;
}
|