4741aa72 |
1 | /****************************************************************************** |
2 | * |
3 | * LDC2 source code |
4 | * |
5 | * $Date: 2007/03/26 01:00:40 $ |
6 | * $Author: hachti $ |
7 | * |
8 | * $Log: tape_block.cpp,v $ |
9 | * Revision 2.0 2007/03/26 01:00:40 hachti |
10 | * *** empty log message *** |
11 | * |
12 | * |
13 | ******************************************************************************/ |
14 | |
7880ae2d |
15 | |
16 | |
17 | #include <string> |
18 | #include <vector> |
19 | |
97b26985 |
20 | #include <stdlib.h> |
21 | #include <unistd.h> |
22 | #include <string.h> |
09cb0f4f |
23 | #include <stdio.h> |
6c06db96 |
24 | |
97b26985 |
25 | #include "tape_block.hh" |
7880ae2d |
26 | |
27 | #include "silent_code.hh" |
28 | #include "hw_constants.hh" |
29 | |
30 | #include "eot_block.hh" |
97b26985 |
31 | #include "data_block.hh" |
7880ae2d |
32 | #include "broken_block.hh" |
0ec6e042 |
33 | #include "data_block_0.hh" |
09cb0f4f |
34 | #include "data_block_0_0.hh" |
35 | #include "data_block_0_1.hh" |
36 | #include "data_block_0_2.hh" |
37 | #include "data_block_0_3.hh" |
38 | #include "data_block_0_4.hh" |
39 | #include "data_block_0_10.hh" |
40 | #include "data_block_0_14.hh" |
41 | #include "data_block_0_24.hh" |
42 | #include "data_block_0_44.hh" |
43 | #include "data_block_0_30.hh" |
44 | #include "data_block_0_54.hh" |
45 | #include "data_block_0_60.hh" |
46 | #include "data_block_0_50.hh" |
fd9632c0 |
47 | #include "data_block_0_64.hh" |
48 | #include "data_block_1.hh" |
49 | #include "data_block_2.hh" |
50 | #include "data_block_3.hh" |
51 | #include "data_block_4.hh" |
52 | #include "data_block_5.hh" |
53 | #include "data_block_6.hh" |
54 | #include "data_block_7.hh" |
97b26985 |
55 | |
6c06db96 |
56 | using namespace std; |
57 | |
58 | /***************************************************************/ |
59 | /*! |
60 | *\brief Destructor. |
61 | */ |
62 | tape_block::~tape_block(){ |
63 | free(raw_data); |
64 | free(word_data); |
65 | } |
66 | |
67 | /***************************************************************/ |
68 | /*! |
69 | *\brief Copy constructor. |
70 | */ |
71 | tape_block::tape_block(tape_block & org){ |
72 | operator=(org); |
73 | } |
74 | |
75 | /***************************************************************/ |
76 | /*! |
77 | *\brief Assignment operator. |
78 | */ |
79 | void tape_block::operator=(tape_block &org){ |
80 | block_type=org.block_type; |
fed2c751 |
81 | discarded_bytes=org.discarded_bytes; |
6c06db96 |
82 | raw_data=0; |
83 | raw_size=org.raw_size; |
84 | word_data=0; |
85 | word_size=org.word_size; |
86 | if (raw_size){ |
87 | raw_data=(unsigned char *)malloc(raw_size); |
88 | memcpy(raw_data,org.raw_data,raw_size); |
89 | } |
90 | if (word_size){ |
91 | word_data=(unsigned short *)malloc(word_size*sizeof(unsigned short)); |
92 | memcpy(word_data,org.word_data,word_size*sizeof(unsigned short)); |
93 | } |
94 | } |
95 | |
6c06db96 |
96 | /***************************************************************/ |
97 | /*! |
98 | *\brief Determine the block's type |
99 | * |
100 | * This routine returns the block's type.\\ |
101 | *\retval TBT_DATA if it's a data block |
102 | *\retval TBT_EOT if it's an end of tape mark |
6c06db96 |
103 | * |
104 | *\note This function is virtual. That means that if the tape block in |
105 | * question is of the subtype data_block which overwrites this method, |
106 | * it will return the block type contained in the upper 4 bits of the |
107 | * first data word! Try to avoid testing for TBT_DATA. \n |
108 | * Blocks generated by gen_from_fd should never have TBT_DATA. |
109 | */ |
110 | int tape_block::get_type(){ |
111 | return block_type; |
112 | } |
113 | |
114 | /***************************************************************/ |
115 | /*! |
116 | *\brief Determine the block's subtype |
117 | * |
118 | * Some data block types have a subtype. |
119 | *\note This is a virtual method and to be used in derived classes. |
120 | *\return Always 0 |
121 | */ |
122 | int tape_block::get_subtype(){ |
123 | return 0; |
124 | } |
125 | |
126 | /***************************************************************/ |
127 | /*! |
128 | *\brief Get a cleartext description of the block. |
129 | *\return ldc style descriptive line for the block |
130 | */ |
131 | vector<string> tape_block:: get_description(){ |
6c06db96 |
132 | vector<string> result; |
09cb0f4f |
133 | result.insert(result.end(), |
134 | "***** "+get_typestring()+"Untyped tape block"); |
6c06db96 |
135 | return result; |
136 | } |
137 | |
138 | /***************************************************************/ |
139 | /*! |
140 | *\brief Get size of the internal raw data buffer |
141 | *\return The size of the internal raw data buffer |
142 | */ |
143 | int tape_block::get_raw_size(){ |
144 | return raw_size; |
145 | } |
146 | |
fed2c751 |
147 | /***************************************************************/ |
148 | /*! |
149 | *\brief Get amount of bytes discarded before beginning |
150 | * of block sensed. |
151 | *\return Length of unusable tape before block start delimiter. |
152 | */ |
153 | int tape_block::get_discarded_bytes(){ |
154 | return discarded_bytes; |
155 | } |
156 | |
6c06db96 |
157 | /***************************************************************/ |
158 | /*! |
159 | *\brief Access internal raw data buffer |
160 | * |
161 | * The raw data buffer contains all block data except the \ \ |
162 | * block start delimiter and block end delimiter. |
163 | *\return Pointer to internal raw data buffer of the block |
164 | */ |
165 | unsigned char * tape_block::get_raw_data(){ |
166 | return raw_data; |
167 | } |
168 | |
874a2bd8 |
169 | /***************************************************************/ |
170 | /*! |
171 | *\brief Dump contents of the block to a file descriptor. |
172 | * |
173 | *\param fd A writable file descriptor. |
174 | *\return Always zero. |
175 | *\throw io_error_exception A write error occured. |
176 | */ |
177 | int tape_block::dump_to_fd(int fd){ |
178 | int to_write=raw_size; |
179 | unsigned char * dump_ptr=raw_data; |
180 | int written; |
181 | while (to_write) { |
182 | written=write(fd,dump_ptr,to_write); |
183 | if (written < 0) throw io_error_exception(); |
184 | to_write-=written; |
185 | dump_ptr+=written; |
186 | } |
187 | return 0; |
188 | } |
189 | |
190 | /***************************************************************/ |
191 | /*! |
192 | *\brief Determine if the block marks the end of an object |
193 | *\retval true The block marks the end of an object. |
194 | *\retval false The block does not mark the end of an object. |
195 | *\note This is only a virtual method returning always false. |
196 | * Classes which can be the legal last block of an object |
197 | * will overwrite this method so that it returns true. |
198 | */ |
199 | bool tape_block::is_endblock(){ |
200 | return false; |
201 | } |
202 | |
203 | /***************************************************************/ |
204 | /*! |
205 | *\brief Get exported symbols. |
206 | *\return A vector containing any symbols exported in this block. |
207 | *\note This is only a virtual method returning always an empty |
208 | * vector. Classes describing appropriate data blocks |
209 | * will override this method. |
210 | */ |
211 | vector<string> tape_block::get_exported_symbols(){ |
212 | vector<string> result; |
213 | return result; |
214 | } |
215 | |
216 | /***************************************************************/ |
217 | /*! |
218 | *\brief Get called symbols. |
219 | *\return A vector containing any symbols called in this block. |
220 | *\note This is only a virtual method returning always an empty |
221 | * vector. Classes describing appropriate data blocks |
222 | * will override this method. |
223 | */ |
224 | vector<string> tape_block::get_called_symbols(){ |
225 | vector<string> result; |
226 | return result; |
227 | } |
228 | |
229 | /***************************************************************/ |
230 | /*! |
231 | *\brief Determine if the block has a known type. |
232 | *\return true if type and subtype are known. |
233 | *\return false if the block type is not one of the valid end |
234 | * nodes of the type tree. |
235 | */ |
236 | bool tape_block::has_known_type(){ |
237 | return m_has_known_type; |
238 | } |
239 | |
6c06db96 |
240 | /***************************************************************/ |
241 | /*! |
7880ae2d |
242 | *\brief Static factory method for tape blocks. |
6c06db96 |
243 | * |
244 | * This method creates a tape_block by using the private |
09cb0f4f |
245 | * constructor with file descriptor support.\n |
7880ae2d |
246 | * |
6c06db96 |
247 | * The factory method tries to determine the block's type and then |
248 | * looks for appropriate subclasses. If there's an appropriate |
249 | * subclass fitting the newly-created object, an |
250 | * object of the subclass will be created and a pointer to this |
251 | * object will be returned to the caller.\n |
252 | * This allows for easy use of the object using it's virtual |
253 | * interface methods or a cast of the pointer to a sub type pointer |
254 | * according to the type information, and then using the subtype's |
09cb0f4f |
255 | * methods not already present in tape_block.\n |
256 | * Objects of the following subclasses are automagically generated:\n |
6c06db96 |
257 | * - eot_block |
258 | * - data_block |
09cb0f4f |
259 | * - data_block_0 |
260 | * - data_block_0_0 |
261 | * - data_block_0_1 |
262 | * - data_block_0_2 |
263 | * - data_block_0_3 |
264 | * - data_block_0_4 |
265 | * - data_block_0_10 |
266 | * - data_block_0_14 |
267 | * - data_block_0_24 |
268 | * - data_block_0_30 |
269 | * - data_block_0_50 |
270 | * - data_block_0_54 |
271 | * - data_block_0_60 |
fd9632c0 |
272 | * - data_block_0_64 |
09cb0f4f |
273 | * - data_block_1 |
274 | * - data_block_2 |
275 | * - data_block_3 |
276 | * - data_block_4 |
277 | * - data_block_5 |
278 | * - data_block_6 |
279 | * - data_block_7 |
6c06db96 |
280 | * |
7880ae2d |
281 | *\return Pointer to an instance of tape_block or a subclass. |
282 | *\param fd A file descriptor where data can be read from. |
6c06db96 |
283 | *\param input_start A pointer to a function |
284 | * called before reading data from fd. |
285 | *\param input_stop A pointer to a function |
286 | * called after reading data from fd. |
287 | * |
288 | *\param start_stop_arg A pointer passed to input_start |
289 | * and input_stop(). Can be anything. |
290 | */ |
0ec6e042 |
291 | tape_block * tape_block::gen_from_fd(int fd, |
292 | void(*input_start)(void *), |
293 | void (*input_stop)(void *), |
294 | void * start_stop_arg) |
97b26985 |
295 | { |
fd9632c0 |
296 | tape_block * n_tape_block=0; |
297 | data_block * n_data_block=0; |
298 | data_block * n_data_block_x=0; |
299 | data_block_0 * n_data_block_0=0; |
300 | data_block_0 * n_data_block_0_x=0; |
301 | eot_block * n_eot_block=0; |
7880ae2d |
302 | broken_block * n_broken_block=0; |
303 | |
50c86ded |
304 | //Use the private constructor which reads in the block from a file descriptor |
7880ae2d |
305 | try{ |
fd9632c0 |
306 | n_tape_block=new tape_block(fd,input_start,input_stop,start_stop_arg); |
7880ae2d |
307 | } |
fd9632c0 |
308 | |
7880ae2d |
309 | catch(checksum_error_exception e){ |
310 | n_broken_block=new broken_block(*(e.get_block())); |
311 | delete e.get_block(); |
312 | throw checksum_error_exception(n_broken_block); |
313 | } |
314 | |
315 | // Retype to data_block, eot_block - if possible |
fd9632c0 |
316 | switch(n_tape_block->get_type()){ |
317 | case tape_block::TBT_DATA: |
318 | n_data_block = new data_block(*n_tape_block); |
0ec6e042 |
319 | break; |
09cb0f4f |
320 | case tape_block::TBT_EOT: |
fd9632c0 |
321 | n_eot_block=new eot_block(*n_tape_block); |
322 | delete n_tape_block; |
874a2bd8 |
323 | n_eot_block->m_has_known_type=true; |
fd9632c0 |
324 | return n_eot_block; |
50c86ded |
325 | default: // Unknown block, a bad thing! |
326 | return n_tape_block; |
0ec6e042 |
327 | } |
fd9632c0 |
328 | delete n_tape_block; |
329 | |
330 | // Now only data blocks are left |
331 | |
332 | switch(n_data_block->get_type()){ |
333 | case 00: n_data_block_0=new data_block_0(*n_data_block); break; |
334 | case 01: n_data_block_x=new data_block_1(*n_data_block); break; |
335 | case 02: n_data_block_x=new data_block_2(*n_data_block); break; |
336 | case 03: n_data_block_x=new data_block_3(*n_data_block); break; |
337 | case 04: n_data_block_x=new data_block_4(*n_data_block); break; |
338 | case 05: n_data_block_x=new data_block_5(*n_data_block); break; |
339 | case 06: n_data_block_x=new data_block_6(*n_data_block); break; |
340 | case 07: n_data_block_x=new data_block_7(*n_data_block); break; |
0ec6e042 |
341 | default: |
fd9632c0 |
342 | return n_data_block; |
343 | } |
344 | if (n_data_block_0==0){ // So we must have found another one |
345 | delete n_data_block; |
874a2bd8 |
346 | n_data_block_x->m_has_known_type=true; |
fd9632c0 |
347 | return n_data_block_x; |
0ec6e042 |
348 | } |
0ec6e042 |
349 | |
fd9632c0 |
350 | // Here only type 0 left |
fd9632c0 |
351 | switch(n_data_block_0->get_subtype()){ |
352 | case 000: n_data_block_0_x=new data_block_0_0(*n_data_block_0); break; |
353 | case 001: n_data_block_0_x=new data_block_0_1(*n_data_block_0); break; |
354 | case 002: n_data_block_0_x=new data_block_0_2(*n_data_block_0); break; |
355 | case 003: n_data_block_0_x=new data_block_0_3(*n_data_block_0); break; |
de6b6757 |
356 | case 004: n_data_block_0_x=new data_block_0_4(*n_data_block_0); break; |
fd9632c0 |
357 | case 010: n_data_block_0_x=new data_block_0_10(*n_data_block_0); break; |
358 | case 014: n_data_block_0_x=new data_block_0_14(*n_data_block_0); break; |
359 | case 024: n_data_block_0_x=new data_block_0_24(*n_data_block_0); break; |
360 | case 044: n_data_block_0_x=new data_block_0_44(*n_data_block_0); break; |
361 | case 030: n_data_block_0_x=new data_block_0_30(*n_data_block_0); break; |
362 | case 054: n_data_block_0_x=new data_block_0_54(*n_data_block_0); break; |
363 | case 060: n_data_block_0_x=new data_block_0_60(*n_data_block_0); break; |
364 | case 064: n_data_block_0_x=new data_block_0_64(*n_data_block_0); break; |
365 | case 050: n_data_block_0_x=new data_block_0_50(*n_data_block_0); break; |
0ec6e042 |
366 | default: |
fd9632c0 |
367 | return n_data_block_0; |
0ec6e042 |
368 | } |
fd9632c0 |
369 | delete n_data_block_0; |
874a2bd8 |
370 | n_data_block_0_x->m_has_known_type=true; |
fd9632c0 |
371 | return n_data_block_0_x; |
97b26985 |
372 | } |
373 | |
6c06db96 |
374 | /***************************************************************/ |
0ec6e042 |
375 | /*! |
376 | *\brief Default constructor. |
377 | */ |
378 | tape_block::tape_block(){} |
379 | |
09cb0f4f |
380 | /***************************************************************/ |
381 | /*! |
382 | *\brief get a short type description string. |
383 | *\return A small string to be used in description methods. |
384 | * |
385 | * The string is always 19 characters long.\n |
386 | * An example is "(99-99) ". |
387 | */ |
388 | string tape_block::get_typestring(){ |
389 | char buffer[13]; |
390 | sprintf(buffer,"(%o-%o) ",get_type(),get_subtype()); |
391 | buffer[10]=0; |
392 | return string(buffer); |
393 | } |
0ec6e042 |
394 | |
6c06db96 |
395 | /***************************************************************/ |
0ec6e042 |
396 | /*! |
397 | *\brief Automatic constructor with file descriptor support |
398 | * |
7880ae2d |
399 | * This constructor is used to initialise the block read in the |
400 | * block's data via a file descriptor.\n |
0ec6e042 |
401 | * This is done in the following way: |
402 | * - input_start() is called. |
403 | * - Data is read from fd. Stops on end of file or end of block |
404 | * or IO error. On EOF or IO error input_stop() is NOT called. |
405 | * - If there was no IO error the block's checksum is calculated |
406 | * and checked. |
407 | * - The block's type field is initialised. |
408 | * - input_stop() is called. |
409 | * |
410 | *\param fd A file descriptor where the read is taken from |
411 | *\param input_stop A pointer to a function called at the end of input |
412 | *\param input_start A pointer to a function called at the beginning |
413 | * of input |
414 | *\param start_stop_arg A pointer passed to input_start and input_stop(). |
415 | */ |
97b26985 |
416 | tape_block::tape_block (int fd, |
417 | void(*input_start)(void *), |
418 | void (*input_stop)(void *), |
419 | void * start_stop_arg |
420 | ) |
421 | { |
422 | unsigned char buffer; |
423 | int retval; |
424 | int eot_needed=EOT_LENGTH; |
425 | int eob_needed=EOB_LENGTH; |
426 | int block_complete=0; |
427 | |
7880ae2d |
428 | block_type= TBT_BROKEN; |
fed2c751 |
429 | discarded_bytes=0; |
97b26985 |
430 | raw_data = 0; |
431 | raw_size = 0; |
432 | word_data = 0; |
433 | word_size = 0; |
fed2c751 |
434 | poolsize = 1024; |
435 | |
436 | // Get initial portion of memory |
437 | raw_data=(unsigned char*)malloc(poolsize); |
438 | |
97b26985 |
439 | if (input_start) input_start (start_stop_arg); |
440 | |
441 | /* Look for block start in input stream */ |
442 | do { |
443 | retval=read(fd, &buffer, 1); |
444 | if (retval == 0){ // End of file |
7880ae2d |
445 | free(raw_data); |
446 | throw eof_legal_exception(discarded_bytes); |
97b26985 |
447 | return; |
448 | } |
449 | if (retval == -1){ // Error reading from fd |
7880ae2d |
450 | free(raw_data); |
451 | throw io_error_exception(); |
97b26985 |
452 | return; |
453 | } |
fed2c751 |
454 | discarded_bytes++; |
97b26985 |
455 | |
456 | /* Look for end ot tape sequence */ |
457 | switch(eot_needed){ |
458 | case 3: |
459 | if (buffer==EOT_SEQ_1) eot_needed--; |
460 | else eot_needed=EOT_LENGTH; |
461 | break; |
462 | case 2: |
463 | if (buffer==EOT_SEQ_2) eot_needed--; |
464 | else eot_needed=EOT_LENGTH; |
465 | break; |
466 | case 1: |
467 | if (buffer==EOT_SEQ_3){ |
7880ae2d |
468 | raw_data=(unsigned char*)realloc(raw_data,3); |
97b26985 |
469 | raw_size=3; |
fed2c751 |
470 | discarded_bytes-=3; |
97b26985 |
471 | raw_data[0]=EOT_SEQ_1; |
472 | raw_data[1]=EOT_SEQ_2; |
473 | raw_data[2]=EOT_SEQ_3; |
474 | block_type =TBT_EOT; |
97b26985 |
475 | return; |
476 | } |
477 | else eot_needed=EOT_LENGTH; |
478 | break; |
479 | } |
480 | } while (buffer != (unsigned char) BLOCK_START_DELIMITER); |
874a2bd8 |
481 | discarded_bytes--; // Don't want to declare the start delimiter discarded! |
fed2c751 |
482 | raw_size=1; // But we want to account it here! |
874a2bd8 |
483 | |
97b26985 |
484 | /* Now input the block data */ |
485 | block_complete = 0; |
874a2bd8 |
486 | |
487 | raw_data[0]=buffer; // Put the start delimiter in! |
488 | |
97b26985 |
489 | do { |
490 | retval = read (fd, &buffer, 1); |
491 | |
492 | if (retval == 0){ // End of file |
7880ae2d |
493 | broken_block * b_block=new broken_block(*this); |
494 | free(raw_data); |
495 | throw eof_illegal_exception(b_block); |
97b26985 |
496 | } |
497 | if (retval == -1){ // Error reading from fd |
7880ae2d |
498 | free(raw_data); |
499 | throw io_error_exception(); |
97b26985 |
500 | } |
97b26985 |
501 | |
502 | /* sort in the new byte */ |
503 | raw_size++; |
fed2c751 |
504 | // Need more memory?? |
874a2bd8 |
505 | if (raw_size>poolsize){ |
fed2c751 |
506 | poolsize+=1024; |
507 | raw_data=(unsigned char*)realloc(raw_data,poolsize); |
508 | } |
509 | |
874a2bd8 |
510 | raw_data[raw_size-1]=buffer; |
97b26985 |
511 | |
512 | /* Look for end ot block sequence */ |
513 | switch(eob_needed){ |
514 | case 2: |
515 | if (buffer==BLOCK_END_DELIMITER_1) eob_needed--; |
516 | else eob_needed=EOB_LENGTH; |
517 | break; |
518 | case 1: |
519 | if (buffer==BLOCK_END_DELIMITER_2){ |
97b26985 |
520 | block_complete=1; |
521 | } |
522 | else eob_needed=EOB_LENGTH; |
523 | break; |
524 | } |
525 | }while (!block_complete); |
7880ae2d |
526 | |
97b26985 |
527 | if (input_stop) input_stop (start_stop_arg); |
528 | |
7880ae2d |
529 | |
97b26985 |
530 | /* Now we have the data in. */ |
531 | |
532 | if (init_words()!=0){ |
7880ae2d |
533 | broken_block * b_block=new broken_block(*this); |
534 | free(raw_data); |
535 | free(word_data); |
536 | throw checksum_error_exception(b_block); |
97b26985 |
537 | } |
7880ae2d |
538 | |
97b26985 |
539 | if (test_checksum()!=0){ |
7880ae2d |
540 | broken_block * b_block=new broken_block(*this); |
541 | free(raw_data); |
542 | free(word_data); |
543 | throw checksum_error_exception(b_block); |
97b26985 |
544 | } |
97b26985 |
545 | block_type=TBT_DATA; |
97b26985 |
546 | } |
547 | |
97b26985 |
548 | |
6c06db96 |
549 | /***************************************************************/ |
0ec6e042 |
550 | /*! |
6c06db96 |
551 | *\brief Initialize word representation of data. |
552 | *\retval 0 on success. |
553 | *\retval 1 on error. |
0ec6e042 |
554 | */ |
97b26985 |
555 | int tape_block::init_words(){ |
874a2bd8 |
556 | word_size=(raw_size-EOB_LENGTH-1)/3; |
97b26985 |
557 | if (word_size<MINIMUM_DATA_BLOCK_WORDSIZE) return 1; // Block too short! |
7880ae2d |
558 | word_data=(unsigned short *)malloc(word_size*sizeof(unsigned short)); |
97b26985 |
559 | for (int pos=0; pos<word_size; pos++) |
874a2bd8 |
560 | word_data[pos]=combine466(raw_data+1+3*pos); |
97b26985 |
561 | return 0; |
562 | } |
563 | |
6c06db96 |
564 | /***************************************************************/ |
0ec6e042 |
565 | /*! |
6c06db96 |
566 | *\brief Calculate and check checksum. |
567 | *\retval 0 on success. |
568 | *\retval 1 on error. |
0ec6e042 |
569 | */ |
97b26985 |
570 | int tape_block::test_checksum(){ |
571 | unsigned short sum=0; |
572 | for (int pos=0; pos<word_size-1;pos++) |
0ec6e042 |
573 | sum^=word_data[pos]; |
97b26985 |
574 | if (sum==word_data[word_size-1]) return 0; |
575 | else return 1; |
576 | } |
6c06db96 |
577 | |
7880ae2d |
578 | /***************************************************************/ |
579 | /*! |
580 | *\brief Standard constructor of exception base class. |
581 | */ |
582 | tape_block::exception::exception(){ |
583 | } |
584 | |
585 | /***************************************************************/ |
586 | /*! |
587 | *\brief Standard desctructor. |
588 | */ |
589 | tape_block::exception::~exception(){ |
590 | } |
591 | |
592 | /***************************************************************/ |
593 | /*! |
594 | *\brief Get pointer to erroneous tape_block |
595 | *\return A pointer to a tape_block instance. |
596 | *\note The user has to take care to free the instance contained |
597 | * in objects of classes supporting this method. |
598 | */ |
599 | tape_block * tape_block::exception::get_block(){ |
600 | return m_broken_block; |
601 | } |
602 | |
603 | /***************************************************************/ |
604 | /*! |
605 | *\brief Constructor |
606 | */ |
607 | tape_block::checksum_error_exception:: |
608 | checksum_error_exception (tape_block * broken_block){ |
609 | this->m_broken_block=broken_block; |
610 | } |
611 | |
612 | /***************************************************************/ |
613 | /*! |
614 | *\brief Constructor |
615 | */ |
616 | tape_block::eof_illegal_exception:: |
617 | eof_illegal_exception (tape_block * broken_block){ |
618 | this->m_broken_block=broken_block; |
619 | } |
620 | |
621 | /***************************************************************/ |
622 | /*! |
623 | *\brief Constructor |
624 | *\param bytes_consumed Amount of bytes read while looking |
625 | * for a block. |
626 | */ |
627 | tape_block::eof_legal_exception:: |
628 | eof_legal_exception(int bytes_consumed){ |
629 | this->m_broken_block=NULL; |
630 | this->bytes_consumed=bytes_consumed; |
631 | } |
632 | |
633 | /***************************************************************/ |
634 | /*! |
635 | *\brief Get amount of consumed data before EOF came along. |
636 | *\return Amound of bytes read from fd while looking for |
637 | * new block or EOF. |
638 | */ |
639 | int tape_block::eof_legal_exception::get_consumed(){ |
640 | return bytes_consumed; |
641 | } |
642 | |
643 | /***************************************************************/ |
644 | /*! |
645 | *\brief Constructor |
646 | */ |
647 | tape_block::io_error_exception:: |
648 | io_error_exception(){ |
649 | this->m_broken_block=NULL; |
650 | } |
651 | |
652 | |
653 | |
654 | |
655 | |
656 | |