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
|
/************************************************************
This example shows a way to recursively traverse the file
using H5Giterate. The method shown here guarantees that
the recursion will not enter an infinite loop, but does
not prevent objects from being visited more than once.
The program prints the directory structure of the file
specified in FILE. The default file used by this example
implements the structure described in the User's Guide,
chapter 4, figure 26.
This file is intended for use with HDF5 Library version 1.6
************************************************************/
#include "hdf5.h"
#include <stdio.h>
#define FILE "h5ex_g_traverse.h5"
/*
* Define operator data structure type for H5Giterate callback.
* During recursive iteration, these structures will form a
* linked list that can be searched for duplicate groups,
* preventing infinite recursion.
*/
struct opdata {
unsigned recurs; /* recursion level. 0=root */
struct opdata *prev; /* pointer to previous opdata */
unsigned long groupno[2]; /* unique group number */
};
/*
* Operator function to be called by H5Giterate.
*/
herr_t op_func(hid_t loc_id, const char *name, void *operator_data);
/*
* Function to check for duplicate groups in a path.
*/
int group_check(struct opdata *od, unsigned long target_groupno[2]);
int
main(void)
{
hid_t file; /* Handle */
herr_t status;
H5G_stat_t statbuf;
struct opdata od;
/*
* Open file and initialize the operator data structure.
*/
file = H5Fopen(FILE, H5F_ACC_RDONLY, H5P_DEFAULT);
status = H5Gget_objinfo(file, "/", 0, &statbuf);
od.recurs = 0;
od.prev = NULL;
od.groupno[0] = statbuf.objno[0];
od.groupno[1] = statbuf.objno[1];
/*
* Print the root group and formatting, begin iteration.
*/
printf("/ {\n");
status = H5Giterate(file, "/", NULL, op_func, (void *)&od);
printf("}\n");
/*
* Close and release resources.
*/
status = H5Fclose(file);
return 0;
}
/************************************************************
Operator function. This function prints the name and type
of the object passed to it. If the object is a group, it
is first checked against other groups in its path using
the group_check function, then if it is not a duplicate,
H5Giterate is called for that group. This guarantees that
the program will not enter infinite recursion due to a
circular path in the file.
************************************************************/
herr_t
op_func(hid_t loc_id, const char *name, void *operator_data)
{
herr_t status, return_val = 0;
H5G_stat_t statbuf;
struct opdata *od = (struct opdata *)operator_data;
/* Type conversion */
unsigned spaces = 2 * (od->recurs + 1);
/* Number of whitespaces to prepend
to output */
/*
* Get type of the object and display its name and type.
* The name of the object is passed to this function by
* the Library.
*/
status = H5Gget_objinfo(loc_id, name, 0, &statbuf);
printf("%*s", spaces, ""); /* Format output */
switch (statbuf.type) {
case H5G_GROUP:
printf("Group: %s {\n", name);
/*
* Check group objno against linked list of operator
* data structures. Only necessary if there is more
* than 1 link to the group.
*/
if ((statbuf.nlink > 1) && group_check(od, statbuf.objno)) {
printf("%*s Warning: Loop detected!\n", spaces, "");
}
else {
/*
* Initialize new operator data structure and
* begin recursive iteration on the discovered
* group. The new opdata structure is given a
* pointer to the current one.
*/
struct opdata nextod;
nextod.recurs = od->recurs + 1;
nextod.prev = od;
nextod.groupno[0] = statbuf.objno[0];
nextod.groupno[1] = statbuf.objno[1];
return_val = H5Giterate(loc_id, name, NULL, op_func, (void *)&nextod);
}
printf("%*s}\n", spaces, "");
break;
case H5G_DATASET:
printf("Dataset: %s\n", name);
break;
case H5G_TYPE:
printf("Datatype: %s\n", name);
break;
default:
printf("Unknown: %s\n", name);
}
return return_val;
}
/************************************************************
This function recursively searches the linked list of
opdata structures for one whose groupno field matches
target_groupno. Returns 1 if a match is found, and 0
otherwise.
************************************************************/
int
group_check(struct opdata *od, unsigned long target_groupno[2])
{
if ((od->groupno[0] == target_groupno[0]) && (od->groupno[1] == target_groupno[1]))
return 1; /* Group numbers match */
else if (!od->recurs)
return 0; /* Root group reached with no matches */
else
return group_check(od->prev, target_groupno);
/* Recursively examine the next node */
}
|
