summaryrefslogtreecommitdiffstats
path: root/src/H5Lpublic.h
blob: 12162bfed53678b813272f7f178bea5e9cb12736 (plain)
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
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * 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 files COPYING and Copyright.html.  COPYING can be found at the root   *
 * of the source code distribution tree; Copyright.html can be found at the  *
 * root level of an installed copy of the electronic HDF5 document set and   *
 * is linked from the top-level documents page.  It can also be found at     *
 * http://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html.  If you do not have     *
 * access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*-------------------------------------------------------------------------
 *
 * Created:             H5Lpublic.h
 *                      Dec 1 2005
 *                      James Laird
 *
 * Purpose:             Public declarations for the H5L package (links)
 *
 *-------------------------------------------------------------------------
 */
#ifndef _H5Lpublic_H
#define _H5Lpublic_H

/* Public headers needed by this file */
#include "H5public.h"
#include "H5Ipublic.h"
#include "H5Tpublic.h"

/*****************/
/* Public Macros */
/*****************/

/* Maximum length of a link's name */
/* (encoded in a 32-bit unsigned integer) */
#define H5L_MAX_LINK_NAME_LEN   ((uint32_t)(-1))  /* (4GB - 1) */

/* Macro to indicate operation occurs on same location */
#define H5L_SAME_LOC 0

/* Current version of the H5L_class_t struct */
#define H5L_LINK_CLASS_T_VERS 0

#ifdef __cplusplus
extern "C" {
#endif

/*******************/
/* Public Typedefs */
/*******************/

/* Link class types.
 * Values less than 64 are reserved for the HDF5 library's internal use.
 * Values 64 to 255 are for "user-defined" link class types; these types are
 * defined by HDF5 but their behavior can be overridden by users.
 * Users who want to create new classes of links should contact the HDF5
 * development team at hdfhelp@ncsa.uiuc.edu .
 * These values can never change because they appear in HDF5 files. 
 */
typedef enum {
    H5L_TYPE_ERROR = (-1),      /* Invalid link type id         */
    H5L_TYPE_HARD = 0,          /* Hard link id                 */
    H5L_TYPE_SOFT = 1,          /* Soft link id                 */
    H5L_TYPE_EXTERNAL = 64,     /* External link id             */
    H5L_TYPE_MAX = 255	        /* Maximum link type id         */
} H5L_type_t;
#define H5L_TYPE_BUILTIN_MAX H5L_TYPE_SOFT      /* Maximum value link value for "built-in" link types */
#define H5L_TYPE_UD_MIN      H5L_TYPE_EXTERNAL  /* Link ids at or above this value are "user-defined" link types. */

/* Buffer for user query function */
typedef struct {
    H5T_cset_t          cset;           /* Character set of link name     */
    int64_t             corder;         /* Creation order                 */
    hbool_t             corder_valid;   /* Indicate if creation order is valid */
    H5L_type_t          type;           /* Type of link                   */
    union {
        haddr_t         address;        /* Address hard link points to    */
        size_t          link_size;      /* Size of a soft link or UD link */
    } u;
} H5L_info_t;

/* The H5L_class_t struct can be used to override the behavior of a
 * "user-defined" link class. Users should populate the struct with callback
 * functions defined below.
 */
/* Callback prototypes for user-defined links */
/* Link creation callback */
typedef herr_t (*H5L_create_func_t)(const char * link_name, hid_t loc_group, void * udata, size_t udata_size, hid_t lcpl_id);

/* Callback for when the link is moved */
typedef herr_t (*H5L_move_func_t)(const char * new_name, hid_t new_loc, void * udata, size_t udata_size);

/* Callback for when the link is copied */
typedef herr_t (*H5L_copy_func_t)(const char * new_name, hid_t new_loc, void * udata, size_t udata_size);

/* Callback during link traversal */
typedef herr_t (*H5L_traverse_func_t)(const char * link_name, hid_t cur_group, void * udata, size_t udata_size, hid_t lapl_id);

/* Callback for when the link is deleted */
typedef herr_t (*H5L_delete_func_t)(const char * link_name, hid_t loc_group, void * udata, size_t udata_size);

/* Callback for querying the link */
/* Returns the size of the buffer needed */
typedef ssize_t (*H5L_query_func_t)(const char * link_name, void * udata, size_t udata_size, void * buf /*out*/, size_t buf_size);

/* User-defined link types */
typedef struct {
    int version;                    /* Version number of this struct        */
    H5L_type_t id;                  /* Link type ID                         */
    const char *comment;            /* Comment for debugging                */
    H5L_create_func_t create_func;  /* Callback during link creation        */
    H5L_move_func_t move_func;      /* Callback after moving link           */
    H5L_copy_func_t copy_func;      /* Callback after copying link          */
    H5L_traverse_func_t trav_func;  /* Callback during link traversal       */
    H5L_delete_func_t del_func;     /* Callback for link deletion           */
    H5L_query_func_t query_func;    /* Callback for queries                 */
} H5L_class_t;

/********************/
/* Public Variables */
/********************/


/*********************/
/* Public Prototypes */
/*********************/
H5_DLL herr_t H5Llink(hid_t cur_loc_id, const char *cur_name,
                        hid_t obj_id, hid_t lcpl_id, hid_t lapl_id);
H5_DLL herr_t H5Lmove(hid_t src_loc, const char *src_name, hid_t dst_loc,
                        const char *dst_name, hid_t lcpl_id, hid_t lapl_id);
H5_DLL herr_t H5Lcopy(hid_t src_loc, const char *src_name, hid_t dst_loc,
                        const char *dst_name, hid_t lcpl_id, hid_t lapl_id);
H5_DLL herr_t H5Lcreate_hard(hid_t cur_loc, const char *cur_name,
		        hid_t dst_loc, const char *dst_name, hid_t lcpl_id,
                        hid_t lapl_id);
H5_DLL herr_t H5Lcreate_soft(const char *target_path, hid_t cur_loc,
                             const char *cur_name, hid_t lcpl_id, hid_t lapl_id);
H5_DLL herr_t H5Lunlink(hid_t loc_id, const char *name, hid_t lapl_id);
H5_DLL herr_t H5Lget_linkval(hid_t loc_id, const char *name, size_t size,
			      void *buf/*out*/, hid_t lapl_id);
H5_DLL herr_t H5Lget_info(hid_t loc_id, const char *name,
                              H5L_info_t *linkbuf /*out*/, hid_t lapl_id);

/* UD link functions */
H5_DLL herr_t H5Lcreate_ud(hid_t link_loc_id, const char *link_name,
        H5L_type_t link_type, const void * udata, size_t udata_size,
        hid_t lcpl_id, hid_t lapl_id);
H5_DLL herr_t H5Lregister(const H5L_class_t *cls);
H5_DLL herr_t H5Lunregister(H5L_type_t id);
H5_DLL htri_t H5Lis_registered(H5L_type_t id);

/* External link functions */
H5_DLL herr_t H5Lunpack_elink_val(char * ext_linkval/*in*/, size_t link_size,
            char ** filename/*out*/, char** obj_path /*out*/);
H5_DLL herr_t H5Lcreate_external(const char *file_name, const char *obj_name,
        hid_t link_loc_id, const char *link_name, hid_t lcpl_id, hid_t lapl_id);

#ifdef __cplusplus
}
#endif
#endif /* _H5Lpublic_H */