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
|
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* 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. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*
* Module Info: This module contains the functionality for setting & querying
* the datatype precision for the H5T interface.
*/
#define H5T_PACKAGE /*suppress error about including H5Tpkg */
#include "H5private.h" /*generic functions */
#include "H5Eprivate.h" /*error handling */
#include "H5Iprivate.h" /*ID functions */
#include "H5Tpkg.h" /*data-type functions */
#define PABLO_MASK H5Tprecis_mask
/* Interface initialization */
static int interface_initialize_g = 0;
#define INTERFACE_INIT H5T_init_precis_interface
static herr_t H5T_init_precis_interface(void);
/* Static local functions */
static herr_t H5T_set_precision(H5T_t *dt, size_t prec);
/*--------------------------------------------------------------------------
NAME
H5T_init_precis_interface -- Initialize interface-specific information
USAGE
herr_t H5T_init_precis_interface()
RETURNS
Non-negative on success/Negative on failure
DESCRIPTION
Initializes any interface-specific data or routines. (Just calls
H5T_init_iterface currently).
--------------------------------------------------------------------------*/
static herr_t
H5T_init_precis_interface(void)
{
FUNC_ENTER_NOINIT(H5T_init_precis_interface);
FUNC_LEAVE_NOAPI(H5T_init());
} /* H5T_init_precis_interface() */
/*-------------------------------------------------------------------------
* Function: H5Tget_precision
*
* Purpose: Gets the precision of a data type. The precision is
* the number of significant bits which, unless padding is
* present, is 8 times larger than the value returned by
* H5Tget_size().
*
* Return: Success: Number of significant bits
*
* Failure: 0 (all atomic types have at least one
* significant bit)
*
* Programmer: Robb Matzke
* Wednesday, January 7, 1998
*
* Modifications:
* Robb Matzke, 22 Dec 1998
* Also works for derived data types.
*
*-------------------------------------------------------------------------
*/
size_t
H5Tget_precision(hid_t type_id)
{
H5T_t *dt = NULL;
size_t ret_value;
FUNC_ENTER_API(H5Tget_precision, 0);
H5TRACE1("z","i",type_id);
/* Check args */
if (NULL == (dt = H5I_object_verify(type_id,H5I_DATATYPE)))
HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, 0, "not a data type");
while (dt->parent)
dt = dt->parent; /*defer to parent*/
if (H5T_COMPOUND==dt->type || H5T_OPAQUE==dt->type)
HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, 0, "operation not defined for specified data type");
/* Precision */
assert(H5T_is_atomic(dt));
ret_value = dt->u.atomic.prec;
done:
FUNC_LEAVE_API(ret_value);
}
/*-------------------------------------------------------------------------
* Function: H5Tset_precision
*
* Purpose: Sets the precision of a data type. The precision is
* the number of significant bits which, unless padding is
* present, is 8 times larger than the value returned by
* H5Tget_size().
*
* If the precision is increased then the offset is decreased
* and then the size is increased to insure that significant
* bits do not "hang over" the edge of the data type.
*
* The precision property of strings is read-only.
*
* When decreasing the precision of a floating point type, set
* the locations and sizes of the sign, mantissa, and exponent
* fields first.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Robb Matzke
* Wednesday, January 7, 1998
*
* Modifications:
* Robb Matzke, 22 Dec 1998
* Moved real work to a private function.
*
*-------------------------------------------------------------------------
*/
herr_t
H5Tset_precision(hid_t type_id, size_t prec)
{
H5T_t *dt = NULL;
herr_t ret_value=SUCCEED; /* Return value */
FUNC_ENTER_API(H5Tset_precision, FAIL);
H5TRACE2("e","iz",type_id,prec);
/* Check args */
if (NULL == (dt = H5I_object_verify(type_id,H5I_DATATYPE)))
HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data type");
if (H5T_STATE_TRANSIENT!=dt->state)
HGOTO_ERROR(H5E_ARGS, H5E_CANTINIT, FAIL, "data type is read-only");
if (prec <= 0)
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "precision must be positive");
if (H5T_ENUM==dt->type && dt->u.enumer.nmembs>0)
HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "operation not allowed after members are defined");
if (H5T_STRING==dt->type)
HGOTO_ERROR(H5E_ARGS, H5E_UNSUPPORTED, FAIL, "precision for this type is read-only");
if (H5T_COMPOUND==dt->type || H5T_OPAQUE==dt->type)
HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "operation not defined for specified data type");
/* Do the work */
if (H5T_set_precision(dt, prec)<0)
HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to set precision");
done:
FUNC_LEAVE_API(ret_value);
}
/*-------------------------------------------------------------------------
* Function: H5T_set_precision
*
* Purpose: Sets the precision of a data type. The precision is
* the number of significant bits which, unless padding is
* present, is 8 times larger than the value returned by
* H5Tget_size().
*
* If the precision is increased then the offset is decreased
* and then the size is increased to insure that significant
* bits do not "hang over" the edge of the data type.
*
* The precision property of strings is read-only.
*
* When decreasing the precision of a floating point type, set
* the locations and sizes of the sign, mantissa, and exponent
* fields first.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Robb Matzke
* Wednesday, January 7, 1998
*
* Modifications:
* Robb Matzke, 22 Dec 1998
* Also works for derived data types.
*
*-------------------------------------------------------------------------
*/
static herr_t
H5T_set_precision(H5T_t *dt, size_t prec)
{
size_t offset, size;
herr_t ret_value=SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5T_set_precision, FAIL);
/* Check args */
assert(dt);
assert(prec>0);
assert(H5T_OPAQUE!=dt->type);
assert(H5T_COMPOUND!=dt->type);
assert(H5T_STRING!=dt->type);
assert(!(H5T_ENUM==dt->type && 0==dt->u.enumer.nmembs));
if (dt->parent) {
if (H5T_set_precision(dt->parent, prec)<0)
HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to set precision for base type");
/* Adjust size of datatype appropriately */
if(dt->type==H5T_ARRAY)
dt->size = dt->parent->size * dt->u.array.nelem;
else if(dt->type!=H5T_VLEN)
dt->size = dt->parent->size;
} else {
if (H5T_is_atomic(dt)) {
/* Adjust the offset and size */
offset = dt->u.atomic.offset;
size = dt->size;
if (prec > 8*size)
offset = 0;
else if (offset+prec > 8 * size)
offset = 8 * size - prec;
if (prec > 8*size)
size = (prec+7) / 8;
/* Check that things are still kosher */
switch (dt->type) {
case H5T_INTEGER:
case H5T_TIME:
case H5T_BITFIELD:
/* nothing to check */
break;
case H5T_FLOAT:
/*
* The sign, mantissa, and exponent fields should be adjusted
* first when decreasing the precision of a floating point
* type.
*/
if (dt->u.atomic.u.f.sign >= prec ||
dt->u.atomic.u.f.epos + dt->u.atomic.u.f.esize > prec ||
dt->u.atomic.u.f.mpos + dt->u.atomic.u.f.msize > prec) {
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "adjust sign, mantissa, and exponent fields first");
}
break;
default:
assert("not implemented yet" && 0);
}
/* Commit */
dt->size = size;
if (H5T_is_atomic(dt)) {
dt->u.atomic.offset = offset;
dt->u.atomic.prec = prec;
}
}
else
HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "operation not defined for specified datatype");
}
done:
FUNC_LEAVE_NOAPI(ret_value);
}
|
