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
|
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* 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. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#include "hdf5.h"
/*-------------------------------------------------------------------------
* print a warning message
*-------------------------------------------------------------------------
*/
static void print_warning(const char *dname, const char *fname)
{
printf("Warning: dataset <%s> cannot be read, %s filter is not available\n",
dname,fname);
}
/*-------------------------------------------------------------------------
* Function: h5tools_canreadf
*
* Purpose: check if the dataset creation property list has filters that
* are not registered in the current configuration
* 1) the external filters GZIP and SZIP might not be available
* 2) the internal filters might be turned off
*
* Return: 1, can read, 0, cannot, -1 error
*
* Programmer: Pedro Vicente, pvn@ncsa.uiuc.edu
*
* Date: March 1, 2004
*
*-------------------------------------------------------------------------
*/
int h5tools_canreadf(const char* name, /* object name, serves also as boolean print */
hid_t dcpl_id) /* dataset creation property list */
{
int nfilters; /* number of filters */
H5Z_filter_t filtn; /* filter identification number */
int i; /* index */
int have_deflate=0; /* assume initially we do not have filters */
int have_szip=0;
int have_shuffle=0;
int have_fletcher=0;
#ifdef H5_HAVE_FILTER_DEFLATE
have_deflate=1;
#endif
#ifdef H5_HAVE_FILTER_SZIP
have_szip=1;
#endif
#ifdef H5_HAVE_FILTER_SHUFFLE
have_shuffle=1;
#endif
#ifdef H5_HAVE_FILTER_FLETCHER32
have_fletcher=1;
#endif
/* get information about filters */
if ((nfilters = H5Pget_nfilters(dcpl_id))<0)
return -1;
/* if we do not have filters, we can read the dataset safely */
if (!nfilters)
return 1;
/* check availability of filters */
for (i=0; i<nfilters; i++)
{
if ((filtn = H5Pget_filter(dcpl_id,(unsigned)i,0,0,0,0,0))<0)
return -1;
switch (filtn)
{
default:
break;
/*-------------------------------------------------------------------------
* H5Z_FILTER_DEFLATE 1 , deflation like gzip
*-------------------------------------------------------------------------
*/
case H5Z_FILTER_DEFLATE:
if (!have_deflate)
{
if (name)
print_warning(name,"deflate");
return 0;
}
break;
/*-------------------------------------------------------------------------
* H5Z_FILTER_SZIP 4 , szip compression
*-------------------------------------------------------------------------
*/
case H5Z_FILTER_SZIP:
if (!have_szip)
{
if (name)
print_warning(name,"SZIP");
return 0;
}
break;
/*-------------------------------------------------------------------------
* H5Z_FILTER_SHUFFLE 2 , shuffle the data
*-------------------------------------------------------------------------
*/
case H5Z_FILTER_SHUFFLE:
if (!have_shuffle)
{
if (name)
print_warning(name,"shuffle");
return 0;
}
break;
/*-------------------------------------------------------------------------
* H5Z_FILTER_FLETCHER32 3 , fletcher32 checksum of EDC
*-------------------------------------------------------------------------
*/
case H5Z_FILTER_FLETCHER32:
if (!have_fletcher)
{
if (name)
print_warning(name,"fletcher32");
return 0;
}
break;
}/*switch*/
}/*for*/
return 1;
}
|
