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SR_rbo.hh
1 /* ========================================================================= *
2 * *
3 * OpenMesh *
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5 * Department of Computer Graphics and Multimedia *
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40 * ========================================================================= */
41
42 /*===========================================================================*\
43 * *
44 * $Revision$ *
45 * $Date$ *
46 * *
47 \*===========================================================================*/
48
49
50 //=============================================================================
51 //
52 // Helper Functions for binary reading / writing
53 //
54 //=============================================================================
55
56 #ifndef OPENMESH_SR_RBO_HH
57 #define OPENMESH_SR_RBO_HH
58
59
60 //== INCLUDES =================================================================
61
62 #include <OpenMesh/Core/System/config.h>
63 // -------------------- STL
64 #if defined(OM_CC_MIPS)
65 # include <stdio.h> // size_t
66 #else
67 # include <cstdio> // size_t
68 #endif
69 #include <algorithm>
70 #include <typeinfo>
71 // -------------------- OpenMesh
72 #include <OpenMesh/Core/System/omstream.hh>
73 #include <OpenMesh/Core/IO/SR_types.hh>
74 #include <OpenMesh/Core/Utils/GenProg.hh>
75
76 //== NAMESPACES ===============================================================
77
78 namespace OpenMesh {
79 namespace IO {
80
81
82 //=============================================================================
83
84
89
90
91 //-----------------------------------------------------------------------------
92
96 template < size_t N > inline
97 void _reverse_byte_order_N(uint8_t* _val);
98
99 template <> inline
100 void _reverse_byte_order_N<1>(uint8_t* /*_val*/) { }
101
102
103 template <> inline
104 void _reverse_byte_order_N<2>(uint8_t* _val)
105 {
106 _val[0] ^= _val[1]; _val[1] ^= _val[0]; _val[0] ^= _val[1];
107 }
108
109
110 template <> inline
111 void _reverse_byte_order_N<4>(uint8_t* _val)
112 {
113 _val[0] ^= _val[3]; _val[3] ^= _val[0]; _val[0] ^= _val[3]; // 0 <-> 3
114 _val[1] ^= _val[2]; _val[2] ^= _val[1]; _val[1] ^= _val[2]; // 1 <-> 2
115 }
116
117
118 template <> inline
119 void _reverse_byte_order_N<8>(uint8_t* _val)
120 {
121 _val[0] ^= _val[7]; _val[7] ^= _val[0]; _val[0] ^= _val[7]; // 0 <-> 7
122 _val[1] ^= _val[6]; _val[6] ^= _val[1]; _val[1] ^= _val[6]; // 1 <-> 6
123 _val[2] ^= _val[5]; _val[5] ^= _val[2]; _val[2] ^= _val[5]; // 2 <-> 5
124 _val[3] ^= _val[4]; _val[4] ^= _val[3]; _val[3] ^= _val[4]; // 3 <-> 4
125 }
126
127
128 template <> inline
129 void _reverse_byte_order_N<12>(uint8_t* _val)
130 {
131 _val[0] ^= _val[11]; _val[11] ^= _val[0]; _val[0] ^= _val[11]; // 0 <-> 11
132 _val[1] ^= _val[10]; _val[10] ^= _val[1]; _val[1] ^= _val[10]; // 1 <-> 10
133 _val[2] ^= _val[ 9]; _val[ 9] ^= _val[2]; _val[2] ^= _val[ 9]; // 2 <-> 9
134 _val[3] ^= _val[ 8]; _val[ 8] ^= _val[3]; _val[3] ^= _val[ 8]; // 3 <-> 8
135 _val[4] ^= _val[ 7]; _val[ 7] ^= _val[4]; _val[4] ^= _val[ 7]; // 4 <-> 7
136 _val[5] ^= _val[ 6]; _val[ 6] ^= _val[5]; _val[5] ^= _val[ 6]; // 5 <-> 6
137 }
138
139
140 template <> inline
141 void _reverse_byte_order_N<16>(uint8_t* _val)
142 {
143 _reverse_byte_order_N<8>(_val);
144 _reverse_byte_order_N<8>(_val+8);
145 std::swap(*(uint64_t*)_val, *(((uint64_t*)_val)+1));
146 }
147
148
149 //-----------------------------------------------------------------------------
150 // wrapper for byte reordering
151
152 // reverting pointers makes no sense, hence forbid it.
155 template <typename T> inline T* reverse_byte_order(T* t);
156 // Should never reach this point. If so, then some operator were not
157 // overloaded. Especially check for IO::binary<> specialization on
158 // custom data types.
159
160
161 inline void compile_time_error__no_fundamental_type()
162 {
163 // we should never reach this point
164 assert(false);
165 }
166
167 // default action for byte reversal: cause an error to avoid
168 // surprising behaviour!
169 template <typename T> T& reverse_byte_order( T& _t )
170 {
171 omerr() << "Not defined for type " << typeid(T).name() << std::endl;
172 compile_time_error__no_fundamental_type();
173 return _t;
174 }
175
176 template <> inline bool& reverse_byte_order(bool & _t) { return _t; }
177 template <> inline char& reverse_byte_order(char & _t) { return _t; }
178 #if defined(OM_CC_GCC)
179 template <> inline signed char& reverse_byte_order(signed char & _t) { return _t; }
180 #endif
181 template <> inline uchar& reverse_byte_order(uchar& _t) { return _t; }
182
183 // Instead do specializations for the necessary types
184 #define REVERSE_FUNDAMENTAL_TYPE( T ) \
185 template <> inline T& reverse_byte_order( T& _t ) {\
186 _reverse_byte_order_N<sizeof(T)>( reinterpret_cast<uint8_t*>(&_t) ); \
187 return _t; \
188 }
189
190 // REVERSE_FUNDAMENTAL_TYPE(bool)
191 // REVERSE_FUNDAMENTAL_TYPE(char)
192 // REVERSE_FUNDAMENTAL_TYPE(uchar)
193 REVERSE_FUNDAMENTAL_TYPE(int16_t)
194 REVERSE_FUNDAMENTAL_TYPE(uint16_t)
195 // REVERSE_FUNDAMENTAL_TYPE(int)
196 // REVERSE_FUNDAMENTAL_TYPE(uint)
197
198 REVERSE_FUNDAMENTAL_TYPE(unsigned long)
199 REVERSE_FUNDAMENTAL_TYPE(int32_t)
200 REVERSE_FUNDAMENTAL_TYPE(uint32_t)
201 REVERSE_FUNDAMENTAL_TYPE(int64_t)
202 REVERSE_FUNDAMENTAL_TYPE(uint64_t)
203 REVERSE_FUNDAMENTAL_TYPE(float)
204 REVERSE_FUNDAMENTAL_TYPE(double)
205 REVERSE_FUNDAMENTAL_TYPE(long double)
206
207 #undef REVERSE_FUNDAMENTAL_TYPE
208
209 #if 0
210
211 #define REVERSE_VECTORT_TYPE( T ) \
212 template <> inline T& reverse_byte_order(T& _v) {\
213 for (size_t i; i< T::size_; ++i) \
214 _reverse_byte_order_N< sizeof(T::value_type) >( reinterpret_cast<uint8_t*>(&_v[i])); \
215 return _v; \
216 }
217
218 #define REVERSE_VECTORT_TYPES( N ) \
219 REVERSE_VECTORT_TYPE( Vec##N##c ) \
220 REVERSE_VECTORT_TYPE( Vec##N##uc ) \
221 REVERSE_VECTORT_TYPE( Vec##N##s ) \
222 REVERSE_VECTORT_TYPE( Vec##N##us ) \
223 REVERSE_VECTORT_TYPE( Vec##N##i ) \
224 REVERSE_VECTORT_TYPE( Vec##N##ui ) \
225 REVERSE_VECTORT_TYPE( Vec##N##f ) \
226 REVERSE_VECTORT_TYPE( Vec##N##d ) \
227
228 REVERSE_VECTORT_TYPES(1)
229 REVERSE_VECTORT_TYPES(2)
230 REVERSE_VECTORT_TYPES(3)
231 REVERSE_VECTORT_TYPES(4)
232 REVERSE_VECTORT_TYPES(6)
233
234 #undef REVERSE_VECTORT_TYPES
235 #undef REVERSE_VECTORT_TYPE
236
237 #endif
238
239 template <typename T> inline
240 T reverse_byte_order(const T& a)
241 {
242 compile_timer_error__const_means_const(a);
243 return a;
244 }
245
246
248
249
250 //=============================================================================
251 } // namespace IO
252 } // namespace OpenMesh
253 //=============================================================================
254 #endif // OPENMESH_SR_RBO_HH defined
255 //=============================================================================
256
OpenMesh::IO::uchar
unsigned char uchar
Definition: SR_types.hh:81
OpenMesh::IO::_reverse_byte_order_N< 1 >
void _reverse_byte_order_N< 1 >(uint8_t *)
Definition: SR_rbo.hh:100
OpenMesh
Definition: MeshItems.hh:64
omstream.hh
OpenMesh::IO::_reverse_byte_order_N
void _reverse_byte_order_N(uint8_t *_val)
OpenMesh::IO::compile_time_error__no_fundamental_type
void compile_time_error__no_fundamental_type()
Definition: SR_rbo.hh:161
config.h
OpenMesh::IO::uint16_t
unsigned short uint16_t
Definition: SR_types.hh:86
OpenMesh::IO::_reverse_byte_order_N< 12 >
void _reverse_byte_order_N< 12 >(uint8_t *_val)
Definition: SR_rbo.hh:129
OpenMesh::IO::_reverse_byte_order_N< 2 >
void _reverse_byte_order_N< 2 >(uint8_t *_val)
Definition: SR_rbo.hh:104
OpenMesh::IO::int16_t
short int16_t
Definition: SR_types.hh:86
OpenMesh::IO::_reverse_byte_order_N< 4 >
void _reverse_byte_order_N< 4 >(uint8_t *_val)
Definition: SR_rbo.hh:111
OpenMesh::IO::int64_t
long long int64_t
Definition: SR_types.hh:94
OpenMesh::IO::_reverse_byte_order_N< 16 >
void _reverse_byte_order_N< 16 >(uint8_t *_val)
Definition: SR_rbo.hh:141
OpenMesh::IO::_reverse_byte_order_N< 8 >
void _reverse_byte_order_N< 8 >(uint8_t *_val)
Definition: SR_rbo.hh:119
OpenMesh::IO::uint32_t
unsigned int uint32_t
Definition: SR_types.hh:90
OpenMesh::IO::int32_t
int int32_t
Definition: SR_types.hh:90
OpenMesh::IO::uint64_t
unsigned long long uint64_t
Definition: SR_types.hh:94
OpenMesh::IO::reverse_byte_order
T * reverse_byte_order(T *t)
OpenMesh::IO::uint8_t
unsigned char uint8_t
Definition: SR_types.hh:85