/usr/include/gdcm-2.6/gdcmByteSwap.txx is in libgdcm2-dev 2.6.3-3ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | /*=========================================================================
Program: GDCM (Grassroots DICOM). A DICOM library
Copyright (c) 2006-2011 Mathieu Malaterre
All rights reserved.
See Copyright.txt or http://gdcm.sourceforge.net/Copyright.html for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#ifndef GDCMBYTESWAP_TXX
#define GDCMBYTESWAP_TXX
#include "gdcmByteSwap.h"
#include <iostream>
#include <stdlib.h> // abort
namespace gdcm
{
/*
template (class T)
{
void bswap(inout T i)
{
byte* p = cast(byte*)&i;
for (int b = 0; b < T.size/2; ++b)
instance swap(byte).swap(p[b], p[T.size-1-b]);
}
}
*/
// Machine definitions
#ifdef GDCM_WORDS_BIGENDIAN
template <class T>
bool ByteSwap<T>::SystemIsBigEndian() { return true; }
template <class T>
bool ByteSwap<T>::SystemIsLittleEndian() { return false; }
#else
template <class T>
bool ByteSwap<T>::SystemIsBigEndian() { return false; }
template <class T>
bool ByteSwap<T>::SystemIsLittleEndian() { return true; }
#endif
template <class T>
void ByteSwap<T>::Swap(T &p)
{
#ifdef GDCM_WORDS_BIGENDIAN
ByteSwap<T>::SwapFromSwapCodeIntoSystem(p, SwapCode::LittleEndian);
#else
ByteSwap<T>::SwapFromSwapCodeIntoSystem(p, SwapCode::BigEndian);
#endif
}
// Swaps the bytes so they agree with the processor order
template <class T>
void ByteSwap<T>::SwapFromSwapCodeIntoSystem(T &a, SwapCode const &swapcode)
{
//std::cerr << "sizeof(T)= " << sizeof(T) << " " << (int)a << std::endl;
switch(sizeof(T))
{
case 1:
break;
case 2:
Swap4(a, swapcode);
break;
case 4:
Swap8(a, swapcode);
break;
default:
std::cerr << "Impossible" << std::endl;
abort();
}
}
template <class T>
void ByteSwap<T>::SwapRange(T *p, unsigned int num)
{
for(unsigned int i=0; i<num; i++)
{
ByteSwap<T>::Swap(p[i]);
}
}
template <class T>
void ByteSwap<T>::SwapRangeFromSwapCodeIntoSystem(T *p, SwapCode const &sc,
std::streamoff num)
{
for( std::streamoff i=0; i<num; i++)
{
ByteSwap<T>::SwapFromSwapCodeIntoSystem(p[i], sc);
}
}
// Private:
//
template<class T>
void Swap4(T &a, SwapCode const &swapcode)
{
#ifndef GDCM_WORDS_BIGENDIAN
if ( swapcode == 4321 || swapcode == 2143 )
a = (T)(( a << 8 ) | ( a >> 8 ));
#else
if ( swapcode == 1234 || swapcode == 3412 )
a = ( a << 8 ) | ( a >> 8 );
// On big endian as long as the SwapCode is Unknown let's pretend we were
// on a LittleEndian system (might introduce overhead on those system).
else if ( swapcode == SwapCode::Unknown )
a = ( a << 8 ) | ( a >> 8 );
#endif
}
//note: according to http://www.parashift.com/c++-faq-lite/templates.html#faq-35.8
//the inlining of the template class means that the specialization doesn't cause linker errors
template<class T>
inline void Swap8(T &a, SwapCode const &swapcode)
{
switch (swapcode)
{
case SwapCode::Unknown:
#ifdef GDCM_WORDS_BIGENDIAN
a= (( a<<24) | ((a<<8) & 0x00ff0000) | ((a>>8) & 0x0000ff00) | (a>>24) );
#endif
break;
case 1234 :
#ifdef GDCM_WORDS_BIGENDIAN
a= (( a<<24) | ((a<<8) & 0x00ff0000) | ((a>>8) & 0x0000ff00) | (a>>24) );
#endif
break;
case 4321 :
#ifndef GDCM_WORDS_BIGENDIAN
a= (( a<<24) | ((a<<8) & 0x00ff0000) | ((a>>8) & 0x0000ff00) | (a>>24) );
#endif
break;
case 3412 :
a= ((a<<16) | (a>>16) );
break;
case 2143 :
a= (((a<< 8) & 0xff00ff00) | ((a>>8) & 0x00ff00ff) );
break;
default :
std::cerr << "Unexpected swap code:" << swapcode;
}
}
template <>
inline void Swap8<uint16_t>(uint16_t &a, SwapCode const &swapcode)
{
switch (swapcode)
{
case SwapCode::Unknown:
#ifdef GDCM_WORDS_BIGENDIAN
a= (( a<<24) | ((a<<8) & 0x00ff0000) | ((a>>8) & 0x0000ff00) | (a>>24) );
#endif
break;
case 1234 :
#ifdef GDCM_WORDS_BIGENDIAN
a= (( a<<24) | ((a<<8) & 0x00ff0000) | ((a>>8) & 0x0000ff00) | (a>>24) );
#endif
break;
case 4321 :
#ifndef GDCM_WORDS_BIGENDIAN
// probably not really useful since the lowest 0x0000 are what's used in unsigned shorts
// a= (( a<<24) | ((a<<8) & 0x00ff0000) | ((a>>8) & 0x0000ff00) | (a>>24) );
#endif
break;
case 3412 :
//a= ((a<<16) | (a>>16) );//do nothing, a = a
break;
case 2143 :
a= (uint16_t)(((a<< 8) & 0xff00) | ((a>>8) & 0x00ff) );
break;
default :
std::cerr << "Unexpected swap code:" << swapcode;
}
}
} // end namespace gdcm
#endif // GDCMBYTESWAP_TXX
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