Developer Documentation

SR_rbo.hh
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41
42
43
44
45 //=============================================================================
46 //
47 // Helper Functions for binary reading / writing
48 //
49 //=============================================================================
50
51 #ifndef OPENMESH_SR_RBO_HH
52 #define OPENMESH_SR_RBO_HH
53
54
55 //== INCLUDES =================================================================
56
57 #include <OpenMesh/Core/System/config.h>
58 // -------------------- STL
59 #if defined(OM_CC_MIPS)
60 # include <stdio.h> // size_t
61 #else
62 # include <cstdio> // size_t
63 #endif
64 #include <algorithm>
65 #include <typeinfo>
66 // -------------------- OpenMesh
67 #include <OpenMesh/Core/System/omstream.hh>
68 #include <OpenMesh/Core/IO/SR_types.hh>
69 #include <OpenMesh/Core/Utils/GenProg.hh>
70
71 //== NAMESPACES ===============================================================
72
73 namespace OpenMesh {
74 namespace IO {
75
76
77 //=============================================================================
78
79
84
85
86 //-----------------------------------------------------------------------------
87
91 template < size_t N > inline
92 void _reverse_byte_order_N(uint8_t* _val);
93
94 template <> inline
95 void _reverse_byte_order_N<1>(uint8_t* /*_val*/) { }
96
97
98 template <> inline
99 void _reverse_byte_order_N<2>(uint8_t* _val)
100 {
101 _val[0] ^= _val[1]; _val[1] ^= _val[0]; _val[0] ^= _val[1];
102 }
103
104
105 template <> inline
106 void _reverse_byte_order_N<4>(uint8_t* _val)
107 {
108 _val[0] ^= _val[3]; _val[3] ^= _val[0]; _val[0] ^= _val[3]; // 0 <-> 3
109 _val[1] ^= _val[2]; _val[2] ^= _val[1]; _val[1] ^= _val[2]; // 1 <-> 2
110 }
111
112
113 template <> inline
114 void _reverse_byte_order_N<8>(uint8_t* _val)
115 {
116 _val[0] ^= _val[7]; _val[7] ^= _val[0]; _val[0] ^= _val[7]; // 0 <-> 7
117 _val[1] ^= _val[6]; _val[6] ^= _val[1]; _val[1] ^= _val[6]; // 1 <-> 6
118 _val[2] ^= _val[5]; _val[5] ^= _val[2]; _val[2] ^= _val[5]; // 2 <-> 5
119 _val[3] ^= _val[4]; _val[4] ^= _val[3]; _val[3] ^= _val[4]; // 3 <-> 4
120 }
121
122
123 template <> inline
124 void _reverse_byte_order_N<12>(uint8_t* _val)
125 {
126 _val[0] ^= _val[11]; _val[11] ^= _val[0]; _val[0] ^= _val[11]; // 0 <-> 11
127 _val[1] ^= _val[10]; _val[10] ^= _val[1]; _val[1] ^= _val[10]; // 1 <-> 10
128 _val[2] ^= _val[ 9]; _val[ 9] ^= _val[2]; _val[2] ^= _val[ 9]; // 2 <-> 9
129 _val[3] ^= _val[ 8]; _val[ 8] ^= _val[3]; _val[3] ^= _val[ 8]; // 3 <-> 8
130 _val[4] ^= _val[ 7]; _val[ 7] ^= _val[4]; _val[4] ^= _val[ 7]; // 4 <-> 7
131 _val[5] ^= _val[ 6]; _val[ 6] ^= _val[5]; _val[5] ^= _val[ 6]; // 5 <-> 6
132 }
133
134
135 template <> inline
136 void _reverse_byte_order_N<16>(uint8_t* _val)
137 {
138 _reverse_byte_order_N<8>(_val);
139 _reverse_byte_order_N<8>(_val+8);
140 std::swap(*(uint64_t*)_val, *(((uint64_t*)_val)+1));
141 }
142
143
144 //-----------------------------------------------------------------------------
145 // wrapper for byte reordering
146
147 // reverting pointers makes no sense, hence forbid it.
150 template <typename T> inline T* reverse_byte_order(T* t);
151 // Should never reach this point. If so, then some operator were not
152 // overloaded. Especially check for IO::binary<> specialization on
153 // custom data types.
154
155
156 inline void compile_time_error__no_fundamental_type()
157 {
158 // we should never reach this point
159 assert(false);
160 }
161
162 // default action for byte reversal: cause an error to avoid
163 // surprising behaviour!
164 template <typename T> T& reverse_byte_order( T& _t )
165 {
166 omerr() << "Not defined for type " << typeid(T).name() << std::endl;
167 compile_time_error__no_fundamental_type();
168 return _t;
169 }
170
171 template <> inline bool& reverse_byte_order(bool & _t) { return _t; }
172 template <> inline char& reverse_byte_order(char & _t) { return _t; }
173 #if defined(OM_CC_GCC)
174 template <> inline signed char& reverse_byte_order(signed char & _t) { return _t; }
175 #endif
176 template <> inline uchar& reverse_byte_order(uchar& _t) { return _t; }
177
178 // Instead do specializations for the necessary types
179 #define REVERSE_FUNDAMENTAL_TYPE( T ) \
180 template <> inline T& reverse_byte_order( T& _t ) {\
181 _reverse_byte_order_N<sizeof(T)>( reinterpret_cast<uint8_t*>(&_t) ); \
182 return _t; \
183 }
184
185 // REVERSE_FUNDAMENTAL_TYPE(bool)
186 // REVERSE_FUNDAMENTAL_TYPE(char)
187 // REVERSE_FUNDAMENTAL_TYPE(uchar)
188 REVERSE_FUNDAMENTAL_TYPE(int16_t)
189 REVERSE_FUNDAMENTAL_TYPE(uint16_t)
190 // REVERSE_FUNDAMENTAL_TYPE(int)
191 // REVERSE_FUNDAMENTAL_TYPE(uint)
192
193 REVERSE_FUNDAMENTAL_TYPE(unsigned long)
194 REVERSE_FUNDAMENTAL_TYPE(int32_t)
195 REVERSE_FUNDAMENTAL_TYPE(uint32_t)
196 REVERSE_FUNDAMENTAL_TYPE(int64_t)
197 REVERSE_FUNDAMENTAL_TYPE(uint64_t)
198 REVERSE_FUNDAMENTAL_TYPE(float)
199 REVERSE_FUNDAMENTAL_TYPE(double)
200 REVERSE_FUNDAMENTAL_TYPE(long double)
201
202 #undef REVERSE_FUNDAMENTAL_TYPE
203
204 #if 0
205
206 #define REVERSE_VECTORT_TYPE( T ) \
207 template <> inline T& reverse_byte_order(T& _v) {\
208 for (size_t i; i< T::size_; ++i) \
209 _reverse_byte_order_N< sizeof(T::value_type) >( reinterpret_cast<uint8_t*>(&_v[i])); \
210 return _v; \
211 }
212
213 #define REVERSE_VECTORT_TYPES( N ) \
214 REVERSE_VECTORT_TYPE( Vec##N##c ) \
215 REVERSE_VECTORT_TYPE( Vec##N##uc ) \
216 REVERSE_VECTORT_TYPE( Vec##N##s ) \
217 REVERSE_VECTORT_TYPE( Vec##N##us ) \
218 REVERSE_VECTORT_TYPE( Vec##N##i ) \
219 REVERSE_VECTORT_TYPE( Vec##N##ui ) \
220 REVERSE_VECTORT_TYPE( Vec##N##f ) \
221 REVERSE_VECTORT_TYPE( Vec##N##d ) \
222
223 REVERSE_VECTORT_TYPES(1)
224 REVERSE_VECTORT_TYPES(2)
225 REVERSE_VECTORT_TYPES(3)
226 REVERSE_VECTORT_TYPES(4)
227 REVERSE_VECTORT_TYPES(6)
228
229 #undef REVERSE_VECTORT_TYPES
230 #undef REVERSE_VECTORT_TYPE
231
232 #endif
233
234 template <typename T> inline
235 T reverse_byte_order(const T& a)
236 {
237 compile_timer_error__const_means_const(a);
238 return a;
239 }
240
241
243
244
245 //=============================================================================
246 } // namespace IO
247 } // namespace OpenMesh
248 //=============================================================================
249 #endif // OPENMESH_SR_RBO_HH defined
250 //=============================================================================
251
OpenMesh::IO::reverse_byte_order
T * reverse_byte_order(T *t)
OpenMesh::IO::_reverse_byte_order_N
void _reverse_byte_order_N(uint8_t *_val)
omstream.hh
OpenMesh::IO::_reverse_byte_order_N< 12 >
void _reverse_byte_order_N< 12 >(uint8_t *_val)
Definition: SR_rbo.hh:124
OpenMesh::IO::_reverse_byte_order_N< 2 >
void _reverse_byte_order_N< 2 >(uint8_t *_val)
Definition: SR_rbo.hh:99
OpenMesh::IO::int16_t
short int16_t
Definition: SR_types.hh:81
OpenMesh::IO::_reverse_byte_order_N< 1 >
void _reverse_byte_order_N< 1 >(uint8_t *)
Definition: SR_rbo.hh:95
config.h
OpenMesh::IO::_reverse_byte_order_N< 16 >
void _reverse_byte_order_N< 16 >(uint8_t *_val)
Definition: SR_rbo.hh:136
OpenMesh::IO::compile_time_error__no_fundamental_type
void compile_time_error__no_fundamental_type()
Definition: SR_rbo.hh:156
OpenMesh::IO::_reverse_byte_order_N< 8 >
void _reverse_byte_order_N< 8 >(uint8_t *_val)
Definition: SR_rbo.hh:114
OpenMesh::IO::uint64_t
unsigned long long uint64_t
Definition: SR_types.hh:89
OpenMesh
Definition: MeshItems.hh:59
OpenMesh::IO::_reverse_byte_order_N< 4 >
void _reverse_byte_order_N< 4 >(uint8_t *_val)
Definition: SR_rbo.hh:106
OpenMesh::IO::uint16_t
unsigned short uint16_t
Definition: SR_types.hh:81
OpenMesh::IO::uint8_t
unsigned char uint8_t
Definition: SR_types.hh:80
OpenMesh::IO::uint32_t
unsigned int uint32_t
Definition: SR_types.hh:85
OpenMesh::IO::int32_t
int int32_t
Definition: SR_types.hh:85
OpenMesh::IO::int64_t
long long int64_t
Definition: SR_types.hh:89
OpenMesh::IO::uchar
unsigned char uchar
Definition: SR_types.hh:76