LORENE
fwrite_be.C
1 /*
2  * Write binary data into a file according to the Big Endian convention
3  *
4  */
5 
6 /*
7  * Copyright (c) 2001 Eric Gourgoulhon
8  *
9  * This file is part of LORENE.
10  *
11  * LORENE is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation; either version 2 of the License, or
14  * (at your option) any later version.
15  *
16  * LORENE is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19  * GNU General Public License for more details.
20  *
21  * You should have received a copy of the GNU General Public License
22  * along with LORENE; if not, write to the Free Software
23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24  *
25  */
26 
27 
28 
29 /*
30  * $Id: fwrite_be.C,v 1.7 2016/12/05 16:18:11 j_novak Exp $
31  * $Log: fwrite_be.C,v $
32  * Revision 1.7 2016/12/05 16:18:11 j_novak
33  * Suppression of some global variables (file names, loch, ...) to prevent redefinitions
34  *
35  * Revision 1.6 2014/10/13 08:53:32 j_novak
36  * Lorene classes and functions now belong to the namespace Lorene.
37  *
38  * Revision 1.5 2014/10/06 15:16:11 j_novak
39  * Modified #include directives to use c++ syntax.
40  *
41  * Revision 1.4 2009/01/19 15:23:17 j_novak
42  * Change of some casts to avoid warnings
43  *
44  * Revision 1.3 2008/08/19 06:42:01 j_novak
45  * Minor modifications to avoid warnings with gcc 4.3. Most of them concern
46  * cast-type operations, and constant strings that must be defined as const char*
47  *
48  * Revision 1.2 2001/12/13 15:01:19 e_gourgoulhon
49  * Array bytes_big now created with a new char[]
50  *
51  * Revision 1.1 2001/12/04 21:32:39 e_gourgoulhon
52  * Functions similar to the stdio fread/fwrite except that they ensure
53  * the big endian convention, whatever the system convention is.
54  *
55  * Revision 1.1 2001/11/23 15:09:09 e_gourgoulhon
56  * Templates for new source files
57  *
58  *
59  * $Header: /cvsroot/Lorene/C++/Source/Non_class_members/Utilities/fwrite_be.C,v 1.7 2016/12/05 16:18:11 j_novak Exp $
60  *
61  */
62 
63 // C headers
64 #include <cstdio>
65 #include <cassert>
66 
67  //-------------------------//
68  // int version //
69  //-------------------------//
70 
71 
72 namespace Lorene {
73 int fwrite_be(const int* aa, int size, int nb, FILE* fich) {
74 
75  assert(size == 4) ;
76 
77  // Determines whether the default storage is big endian
78  // or large endians
79 
80  int itest = 1 ;
81  bool little_endian = ( *( reinterpret_cast<char*>(&itest) ) == 1) ;
82 
83  if (little_endian) {
84 
85  int size_tot = 4 * nb ;
86 
87  char* bytes_big = new char[size_tot] ;
88  char* pbig = bytes_big ;
89  const char* plit = reinterpret_cast<const char*>(aa) ;
90 
91  for (int j=0; j< nb; j++) {
92 
93  for (int i=0; i<4; i++) {
94  pbig[i] = plit[3-i] ;
95  }
96 
97  plit += 4 ; // next item
98  pbig += 4 ;
99 
100  }
101 
102 
103  int nx = int(fwrite(bytes_big, 1, size_tot, fich) / 4) ;
104 
105  delete [] bytes_big ;
106 
107  return nx ;
108 
109  }
110  else { // Big endian case: nothing to do:
111 
112  return int(fwrite(aa, size, nb, fich)) ;
113  }
114 
115 }
116 
117 
118  //-------------------------//
119  // double version //
120  //-------------------------//
121 
122 
123 int fwrite_be(const double* aa, int size, int nb, FILE* fich) {
124 
125  assert(size == 8) ;
126 
127  // Determines whether the default storage is big endian
128  // or large endians
129 
130  int itest = 1 ;
131  bool little_endian = ( *( reinterpret_cast<char*>(&itest) ) == 1) ;
132 
133  if (little_endian) {
134 
135  int size_tot = 8 * nb ;
136 
137  char* bytes_big = new char[size_tot] ;
138  char* pbig = bytes_big ;
139  const char* plit = reinterpret_cast<const char*>(aa) ;
140 
141  for (int j=0; j< nb; j++) {
142 
143  for (int i=0; i<8; i++) {
144  pbig[i] = plit[7-i] ;
145  }
146 
147  plit += 8 ; // next item
148  pbig += 8 ;
149 
150  }
151 
152  int nx = int(fwrite(bytes_big, 1, size_tot, fich) / 8) ;
153  delete [] bytes_big ;
154 
155  return nx ;
156 
157  }
158  else { // Big endian case: nothing to do:
159 
160  return int(fwrite(aa, size, nb, fich)) ;
161  }
162 
163 }
164 }
Lorene prototypes.
Definition: app_hor.h:67
int fwrite_be(const int *aa, int size, int nb, FILE *fich)
Writes integer(s) into a binary file according to the big endian convention.
Definition: fwrite_be.C:73