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1// [Licence]
2// The Ariba-Underlay Copyright
3//
4// Copyright (c) 2008-2009, Institute of Telematics, UniversitÀt Karlsruhe (TH)
5//
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36// Telematics.
37// [Licence]
38
39#ifndef DATA_HPP_
40#define DATA_HPP_
41
42//== library includes ==
43#include <stdlib.h>
44#include <iostream>
45#include <boost/cstdint.hpp>
46
47// forward declaration
48template<typename T> class DefaultDataModel;
49template<typename T = uint8_t, typename DataModel = DefaultDataModel<uint8_t> > class DataTpl;
50typedef DataTpl<> Data;
51template<typename T, typename DataModel> std::ostream& operator<<(std::ostream& stream, DataTpl<T, DataModel>& data);
52
53//== internal includes ==
54#include "../internal/Utilities.hpp"
55
56//== local includes ==
57#include "DataUtilities.hpp"
58#include "Serialization.hpp"
59
60/**
61 * This class implements a wrapper for binary data. And this time, when the
62 * word binary is used -- it really means binary! Length and manipulation
63 * are specified and operate in bit precision. Most of the operations are
64 * highly effective using inline functions and compiler optimizations.
65 *
66 * Two versions of binaries are supported: static, non-resizeable binaries
67 * and dynamic, resizeable ones. Please note, this class does not manage
68 * memory, reference counting etc. you have to take care about memory
69 * management yourself! However you can use the <code>release()</code>
70 * to delete the underlaying array.
71 *
72 * @author Sebastian Mies
73 */
74template<typename T, typename DataModel>
75class DataTpl: public Serializeable { SERIALIZEABLE
76protected:
77 typedef DataTpl<T,DataModel> _Data;
78 DataModel model;
79
80public:
81 static const size_t word_width = sizeof(T) * 8;
82
83 class DataManipulator {
84 private:
85 DataModel bits;
86 size_t index;
87
88 public:
89 finline DataManipulator( DataModel& _bits, size_t _index) :
90 bits(_bits), index(_index) {
91 }
92
93 template<typename X>
94 finline operator X() const {
95 return bitget<X>(bits.buffer(), index);
96 }
97
98 template<typename X>
99 finline DataManipulator& operator=(X value) {
100 bitset(value, bits.buffer(), index );
101 return *this;
102 }
103
104 template<typename X>
105 finline void set(X value, size_t length = sizeof(X) * 8, if_uint(X)) {
106 bitcpy(value, 0, bits.buffer(), index, length);
107 }
108
109 template<typename X>
110 finline void set(X value, size_t length = sizeof(X) * 8, if_int(X)) {
111 set(_unsigned(value),length);
112 }
113
114 template<typename X>
115 finline void get(X& value, size_t length = sizeof(X) * 8, if_uint(X)) const {
116 value = bitget<X> (bits.buffer(), index, length);
117 }
118
119 template<typename X>
120 finline void get(X& value, size_t length = sizeof(X) * 8, if_int(X)) const {
121 _unsigned(value) = bitget<X> (bits.buffer(), index, length);
122 }
123
124 finline void get(bool& value) const {
125 value = bitget( bits.buffer(), index );
126 }
127 };
128
129public:
130 static const Data UNSPECIFIED;
131
132 /**
133 * Constructs a dynamic bit-data object of variable size.
134 */
135 finline DataTpl() : model() {
136 }
137
138 /**
139 * Contructs a copy of an existing data buffer
140 */
141 finline DataTpl(const DataTpl<T, DataModel>& copy) {
142 this->model = copy.model;
143 }
144
145 finline DataTpl( const DataModel& _model ) : model( _model ) {
146 }
147
148 /**
149 * Constructs a static bit-data object with the given buffer.
150 */
151 finline DataTpl(const T* buffer, size_t length) {
152 model.buffer() = buffer;
153 model.length() = length;
154 }
155
156 /**
157 * Constructs a dynamic bit-data object with the given buffer.
158 */
159 finline DataTpl( T* buffer, size_t length ) {
160 model.buffer() = buffer;
161 model.length() = length;
162 }
163
164 /**
165 * Constructs a dynamic bit-data object of variable size with the given
166 * initial size.
167 */
168 finline DataTpl(size_t length) : model() {
169 model.resize(length);
170 }
171
172
173 /**
174 * Returns the internal buffer of the data.
175 */
176 finline T* getBuffer() const {
177 return model.buffer();
178 }
179
180 /**
181 * Returns the length of the data in bits
182 */
183 finline size_t getLength() const {
184 return model.length();
185 }
186 /**
187 * Sets the length of the data in bits
188 */
189 void setLength(size_t new_length) {
190 model.resize(new_length);
191 }
192
193 /**
194 * Ensures that the buffer pointer has the given
195 * number of bits of memory reserved.
196 *
197 * @param neededLength The minimum data length required.
198 */
199 finline void ensureLength( size_t neededLength ) {
200 if ((int) neededLength > model.length() ) model.resize(neededLength);
201 }
202
203 /**
204 * Returns a manipulator object for a certain bit position.
205 *
206 * @param index The index in bits quantitites.
207 * @return A data manipulation object
208 */
209 finline DataManipulator operator[](size_t index) {
210 return DataManipulator(model, index);
211 }
212
213 /**
214 * Returns a constant manipulator object for a certain bit position.
215 *
216 * @param index The index in bits quantitites.
217 * @return A constant data manipulation object
218 */
219 finline const DataManipulator operator[](size_t index) const {
220 return DataManipulator(model, index);
221 }
222
223 _Data sub( size_t index, size_t length = ~0 ) {
224 if (length == ~0) length = model.length()-index;
225 return _Data(model.sub(index,length));
226 }
227
228 /**
229 * Returns a copy of the specified bit range.
230 *
231 * @param index The first bit to copy
232 * @param length The length of the bit range
233 * @return The cloned data object
234 */
235 _Data clone( size_t index, size_t length ) const {
236 DataModel new_model = model.clone(index,length);
237 return _Data(new_model);
238 }
239
240 /**
241 * Returns a copy of the data.
242 *
243 * @return A cloned data object
244 */
245 _Data clone() const {
246 DataModel new_model = model.clone( 0, model.length() );
247 return _Data(new_model);
248 }
249
250 /**
251 * Returns true, if the data is empty (zero length)
252 *
253 * @return True, if the data is empty (zero length)
254 */
255 finline bool isEmpty() const {
256 return (model.length() == 0);
257 }
258
259 /**
260 * Returns true, if the data buffer is unspecified.
261 * In this case no memory is associated with this data object.
262 *
263 * @return True, if the data buffer is unspecified.
264 */
265 finline bool isUnspecified() const {
266 return model.isUnspecified();
267 }
268
269 /**
270 * This method frees the memory associated with
271 * this data object and sets this object into an unspecified
272 * state.
273 */
274 finline void release() {
275 model.release();
276 }
277
278 // operators
279
280 /**
281 * Assigns another buffer
282 */
283 template<typename X>
284 _Data& operator= (const DataTpl<X>& source) {
285 this->model = source.model;
286 return *this;
287 }
288
289 /**
290 * Returns true, if the datas buffer's pointer and length
291 * are the same.
292 */
293 template<typename X>
294 finline bool operator==( DataTpl<X>& data) {
295 return (data.model.buffer() == model.buffer() &&
296 data.model.length() == model.length() );
297 }
298
299 finline _Data& operator&=(_Data& data) {
300 return *this;
301 }
302
303 finline _Data& operator|=(_Data& data) {
304 return *this;
305 }
306
307 finline _Data& operator^=(_Data& data) {
308 return *this;
309 }
310
311 /* implied operators */
312
313 finline _Data operator&(_Data& data) {
314 return (this->clone() &= data);
315 }
316
317 finline _Data operator|(_Data& data) {
318 return (this->clone() |= data);
319 }
320
321 finline _Data operator^(_Data& data) {
322 return (this->clone() ^= data);
323 }
324};
325
326/* default human readable text output */
327template<typename T, typename DataModel>
328std::ostream& operator<<(std::ostream& stream, DataTpl<T, DataModel>& data) {
329 stream << "[" << bitstr(data.getBuffer(), data.getLength(), 4)
330 << "|'";
331 char* buffer = (char*) data.getBuffer();
332 for (size_t i = 0; i < data.getLength() / 8; i++) {
333 char c = buffer[i] < 32 ? '.' : buffer[i];
334 stream << c;
335 }
336 stream << "']";
337 return stream;
338}
339
340/* unspecified type */
341template<typename T, typename DataModel>
342const Data DataTpl<T, DataModel>::UNSPECIFIED;
343
344/**
345 * This class implements the default data model
346 *
347 * @author Sebastian Mies
348 */
349template<typename _T>
350class DefaultDataModel {
351public:
352 typedef _T T;
353 typedef DefaultDataModel<T> _Model;
354
355private:
356
357 int32_t bufferLen;
358 T* bufferPtr;
359
360 static finline int calcLength(int length) {
361 if (length<0) return 0;
362 return ((length/8)/sizeof(T)+1);
363 }
364public:
365 finline DefaultDataModel() {
366 bufferPtr = NULL;
367 bufferLen = -1;
368 }
369
370 finline DefaultDataModel( void* buffer, size_t length ) {
371 bufferPtr = (T*)buffer;
372 bufferLen = length;
373 }
374
375 finline DefaultDataModel( const _Model& source ) {
376 this->bufferPtr = source.bufferPtr;
377 this->bufferLen = source.bufferLen;
378 }
379
380 finline _Model& operator=( const _Model& source ) {
381 this->bufferPtr = source.bufferPtr;
382 this->bufferLen = source.bufferLen;
383 return *this;
384 }
385
386 finline T*& buffer() {
387 return bufferPtr;
388 }
389
390 finline T* buffer() const {
391 return bufferPtr;
392 }
393
394 finline int32_t& length() {
395 return bufferLen;
396 }
397
398 finline int32_t length() const {
399 return bufferLen;
400 }
401
402 finline bool isUnspecified() const {
403 return bufferLen < 0;
404 }
405
406 finline void resize( size_t new_length ) {
407 size_t old_length = calcLength(bufferLen);
408 size_t res_length = calcLength(new_length);
409 if (old_length != res_length) {
410 T* new_buffer = new T[res_length];
411 if (bufferPtr != NULL) {
412 size_t clength = res_length < old_length ? res_length : old_length;
413 memcpy( new_buffer, bufferPtr, clength*sizeof(T) );
414 delete [] bufferPtr;
415 }
416 bufferPtr = new_buffer;
417 bufferLen = new_length;
418 }
419 }
420
421 finline void release() {
422 delete [] bufferPtr;
423 bufferPtr = NULL;
424 bufferLen = -1;
425 }
426
427 finline _Model sub( size_t index, size_t length ) {
428 return _Model( bufferPtr + index/sizeof(T), length );
429 }
430
431 finline _Model clone( size_t index, size_t length ) const {
432 _Model new_model;
433 new_model.resize( length );
434 bitcpy( this->buffer(), index, new_model.buffer(), 0, length );
435 return new_model;
436 }
437};
438
439/* serialization */
440sznBeginDefault( Data, X ){
441 for (size_t i = 0; i< getLength() / word_width; i++) X && getBuffer()[i];
442}sznEnd();
443
444#endif /* DATA_HPP_ */
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