summaryrefslogtreecommitdiffstats
path: root/src/H5Toh.c
blob: 4849f9d1603dde7732dd789994c236935d903774 (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
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
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * 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://www.hdfgroup.org/licenses.               *
 * If you do not have access to either file, you may request a copy from     *
 * help@hdfgroup.org.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/****************/
/* Module Setup */
/****************/

#define H5O_FRIEND     /*suppress error about including H5Opkg	  */
#include "H5Tmodule.h" /* This source code file is part of the H5T module */

/***********/
/* Headers */
/***********/
#include "H5private.h"  /* Generic Functions			*/
#include "H5Eprivate.h" /* Error handling		  	*/
#include "H5Iprivate.h" /* IDs			  		*/
#include "H5Opkg.h"     /* Object headers			*/
#include "H5Tpkg.h"     /* Datatypes				*/

/****************/
/* Local Macros */
/****************/

/******************/
/* Local Typedefs */
/******************/

/********************/
/* Local Prototypes */
/********************/

static htri_t     H5O__dtype_isa(const H5O_t *loc);
static hid_t      H5O__dtype_open(const H5G_loc_t *obj_loc, hbool_t app_ref);
static void *     H5O__dtype_create(H5F_t *f, void *_crt_info, H5G_loc_t *obj_loc);
static H5O_loc_t *H5O__dtype_get_oloc(hid_t obj_id);

/*********************/
/* Package Variables */
/*********************/

/*****************************/
/* Library Private Variables */
/*****************************/

/*******************/
/* Local Variables */
/*******************/

/* This message derives from H5O object class */
const H5O_obj_class_t H5O_OBJ_DATATYPE[1] = {{
    H5O_TYPE_NAMED_DATATYPE, /* object type			*/
    "named datatype",        /* object name, for debugging	*/
    NULL,                    /* get 'copy file' user data	*/
    NULL,                    /* free 'copy file' user data	*/
    H5O__dtype_isa,          /* "isa" 			*/
    H5O__dtype_open,         /* open an object of this class */
    H5O__dtype_create,       /* create an object of this class */
    H5O__dtype_get_oloc,     /* get an object header location for an object */
    NULL,                    /* get the index & heap info for an object */
    NULL                     /* flush an opened object of this class */
}};

/*-------------------------------------------------------------------------
 * Function:	H5O__dtype_isa
 *
 * Purpose:	Determines if an object has the requisite messages for being
 *		a datatype.
 *
 * Return:	Success:	TRUE if the required data type messages are
 *				present; FALSE otherwise.
 *
 *		Failure:	FAIL if the existence of certain messages
 *				cannot be determined.
 *
 * Programmer:	Robb Matzke
 *              Monday, November  2, 1998
 *
 *-------------------------------------------------------------------------
 */
static htri_t
H5O__dtype_isa(const H5O_t *oh)
{
    htri_t ret_value = FAIL; /* Return value */

    FUNC_ENTER_STATIC

    HDassert(oh);

    if ((ret_value = H5O_msg_exists_oh(oh, H5O_DTYPE_ID)) < 0)
        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to read object header")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O__dtype_isa() */

/*-------------------------------------------------------------------------
 * Function:	H5O__dtype_open
 *
 * Purpose:	Open a datatype at a particular location
 *
 * Return:	Success:	Open object identifier
 *		Failure:	Negative
 *
 * Programmer:	Quincey Koziol
 *              Monday, November  6, 2006
 *
 *-------------------------------------------------------------------------
 */
static hid_t
H5O__dtype_open(const H5G_loc_t *obj_loc, hbool_t app_ref)
{
    H5T_t *type      = NULL;            /* Datatype opened */
    hid_t  ret_value = H5I_INVALID_HID; /* Return value */

    FUNC_ENTER_STATIC

    HDassert(obj_loc);

    /* Open the datatype */
    if (NULL == (type = H5T_open(obj_loc)))
        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTOPENOBJ, FAIL, "unable to open datatype")

    /* Register an ID for the datatype */
    if ((ret_value = H5I_register(H5I_DATATYPE, type, app_ref)) < 0)
        HGOTO_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to register datatype")

done:
    if (ret_value < 0)
        if (type && H5T_close(type) < 0)
            HDONE_ERROR(H5E_DATATYPE, H5E_CLOSEERROR, FAIL, "unable to release datatype")

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O__dtype_open() */

/*-------------------------------------------------------------------------
 * Function:	H5O__dtype_create
 *
 * Purpose:	Create a named datatype in a file
 *
 * Return:	Success:	Pointer to the named datatype data structure
 *		Failure:	NULL
 *
 * Programmer:	Quincey Koziol
 *              Wednesday, April 11, 2007
 *
 *-------------------------------------------------------------------------
 */
static void *
H5O__dtype_create(H5F_t *f, void *_crt_info, H5G_loc_t *obj_loc)
{
    H5T_obj_create_t *crt_info  = (H5T_obj_create_t *)_crt_info; /* Named datatype creation parameters */
    void *            ret_value = NULL;                          /* Return value */

    FUNC_ENTER_STATIC

    /* Sanity checks */
    HDassert(f);
    HDassert(crt_info);
    HDassert(obj_loc);

    /* Commit the type to the file */
    if (H5T__commit(f, crt_info->dt, crt_info->tcpl_id) < 0)
        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, NULL, "unable to commit datatype")

    /* Set up the new named datatype's location */
    if (NULL == (obj_loc->oloc = H5T_oloc(crt_info->dt)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "unable to get object location of named datatype")
    if (NULL == (obj_loc->path = H5T_nameof(crt_info->dt)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "unable to get path of named datatype")

    /* Set the return value */
    ret_value = crt_info->dt;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O__dtype_create() */

/*-------------------------------------------------------------------------
 * Function:	H5O__dtype_get_oloc
 *
 * Purpose:	Retrieve the object header location for an open object
 *
 * Return:	Success:	Pointer to object header location
 *		Failure:	NULL
 *
 * Programmer:	Quincey Koziol
 *              Monday, November  6, 2006
 *
 *-------------------------------------------------------------------------
 */
static H5O_loc_t *
H5O__dtype_get_oloc(hid_t obj_id)
{
    H5T_t *    type      = NULL; /* Datatype opened */
    H5O_loc_t *ret_value = NULL; /* Return value */

    FUNC_ENTER_STATIC

    /* Get the datatype */
    if (NULL == (type = (H5T_t *)H5I_object(obj_id)))
        HGOTO_ERROR(H5E_OHDR, H5E_BADATOM, NULL, "couldn't get object from ID")

    /* Get the datatype's object header location */
    if (NULL == (ret_value = H5T_oloc(type)))
        HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, NULL, "unable to get object location from object")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O__dtype_get_oloc() */