CiftiLib
A C++ library for CIFTI-2 and CIFTI-1 files
ByteSwapping.h
1 #ifndef __BYTE_SWAPPING_H__
2 #define __BYTE_SWAPPING_H__
3 
4 /*LICENSE_START*/
5 /*
6  * Copyright (c) 2014, Washington University School of Medicine
7  * All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without modification,
10  * are permitted provided that the following conditions are met:
11  *
12  * 1. Redistributions of source code must retain the above copyright notice,
13  * this list of conditions and the following disclaimer.
14  *
15  * 2. Redistributions in binary form must reproduce the above copyright notice,
16  * this list of conditions and the following disclaimer in the documentation
17  * and/or other materials provided with the distribution.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
20  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
24  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
26  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
28  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29  */
30 
31 #include <stdint.h>
32 
33 namespace cifti {
34 
40  class ByteSwapping {
41  public:
42  template<typename T>
43  static void swap(T& toSwap);
44 
45  template<typename T>
46  static void swapArray(T* toSwap, const uint64_t& count);
47 
48  inline static bool isBigEndian()
49  {
50  uint16_t test = 1;
51  return (((char*)&test)[0] == 0);
52  }
53 
54  };
55 
56  template<typename T>
57  void ByteSwapping::swap(T& toSwap)
58  {
59  if (sizeof(T) == 1) return;//we could specialize 1-byte types, but this should optimize out
60  T temp = toSwap;
61  char* from = (char*)&temp;
62  char* to = (char*)&toSwap;
63  for (int i = 0; i < (int)sizeof(T); ++i)
64  {
65  to[i] = from[sizeof(T) - i - 1];
66  }
67  }
68 
69  template<typename T>
70  void ByteSwapping::swapArray(T* toSwap, const uint64_t& count)
71  {
72  if (sizeof(T) == 1) return;//ditto
73  for (uint64_t i = 0; i < count; ++i)
74  {
75  swap(toSwap[i]);
76  }
77  }
78 
79 }
80 
81 #endif // __BYTE_SWAPPING_H__
82 
cifti::ByteSwapping
Definition: ByteSwapping.h:40
cifti
namespace for all CiftiLib functionality
Definition: CiftiBrainModelsMap.h:41