Line data Source code
1 : /******************************************************************************
2 : *
3 : * Purpose: Implementation of the CExternalChannel class.
4 : *
5 : * This class is used to implement band interleaved channels that are
6 : * references to an external image database that is not just a raw file.
7 : * It uses the application supplied EDB interface to access non-PCIDSK files.
8 : *
9 : ******************************************************************************
10 : * Copyright (c) 2010
11 : * PCI Geomatics, 90 Allstate Parkway, Markham, Ontario, Canada.
12 : *
13 : * Permission is hereby granted, free of charge, to any person obtaining a
14 : * copy of this software and associated documentation files (the "Software"),
15 : * to deal in the Software without restriction, including without limitation
16 : * the rights to use, copy, modify, merge, publish, distribute, sublicense,
17 : * and/or sell copies of the Software, and to permit persons to whom the
18 : * Software is furnished to do so, subject to the following conditions:
19 : *
20 : * The above copyright notice and this permission notice shall be included
21 : * in all copies or substantial portions of the Software.
22 : *
23 : * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
24 : * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
25 : * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
26 : * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
27 : * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
28 : * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
29 : * DEALINGS IN THE SOFTWARE.
30 : ****************************************************************************/
31 :
32 : #include "pcidsk_config.h"
33 : #include "pcidsk_types.h"
34 : #include "pcidsk_channel.h"
35 : #include "pcidsk_buffer.h"
36 : #include "pcidsk_exception.h"
37 : #include "pcidsk_file.h"
38 : #include "core/pcidsk_utils.h"
39 : #include "core/cpcidskfile.h"
40 : #include "channel/cexternalchannel.h"
41 : #include "core/clinksegment.h"
42 : #include <cassert>
43 : #include <cstring>
44 : #include <cstdio>
45 : #include <cstdlib>
46 : #include <climits>
47 :
48 : using namespace PCIDSK;
49 :
50 : /************************************************************************/
51 : /* CExternalChannel() */
52 : /************************************************************************/
53 :
54 0 : CExternalChannel::CExternalChannel( PCIDSKBuffer &image_headerIn,
55 : uint64 ih_offsetIn,
56 : CPL_UNUSED PCIDSKBuffer &file_headerIn,
57 : const std::string& filenameIn,
58 : int channelnumIn,
59 : CPCIDSKFile *fileIn,
60 0 : eChanType pixel_typeIn )
61 0 : : CPCIDSKChannel( image_headerIn, ih_offsetIn, fileIn, pixel_typeIn, channelnumIn)
62 :
63 : {
64 0 : db = nullptr;
65 0 : mutex = nullptr;
66 0 : writable = false;
67 0 : blocks_per_row = 0;
68 :
69 : /* -------------------------------------------------------------------- */
70 : /* Establish the data window. */
71 : /* -------------------------------------------------------------------- */
72 0 : exoff = atoi(image_headerIn.Get( 250, 8 ));
73 0 : eyoff = atoi(image_headerIn.Get( 258, 8 ));
74 0 : exsize = atoi(image_headerIn.Get( 266, 8 ));
75 0 : eysize = atoi(image_headerIn.Get( 274, 8 ));
76 :
77 0 : echannel = atoi(image_headerIn.Get( 282, 8 ));
78 :
79 0 : if (echannel == 0) {
80 0 : echannel = channelnumIn;
81 : }
82 :
83 0 : if( exoff < 0 || eyoff < 0 || exsize < 0 || eysize < 0 )
84 : {
85 0 : ThrowPCIDSKException("Invalid data window parameters for CExternalChannel");
86 : }
87 :
88 : /* -------------------------------------------------------------------- */
89 : /* Establish the file we will be accessing. */
90 : /* -------------------------------------------------------------------- */
91 0 : if( filenameIn != "" )
92 0 : this->filename = filenameIn;
93 : else
94 0 : image_headerIn.Get(64,64,this->filename);
95 0 : }
96 :
97 : /************************************************************************/
98 : /* ~CExternalChannel() */
99 : /************************************************************************/
100 :
101 0 : CExternalChannel::~CExternalChannel()
102 :
103 : {
104 : // no need to deaccess the EDBFile - the file is responsible for that.
105 0 : }
106 :
107 : /************************************************************************/
108 : /* AccessDB() */
109 : /************************************************************************/
110 :
111 0 : void CExternalChannel::AccessDB() const
112 :
113 : {
114 0 : if( db )
115 0 : return;
116 :
117 : /* -------------------------------------------------------------------- */
118 : /* open, or fetch an already open file handle. */
119 : /* -------------------------------------------------------------------- */
120 0 : writable = file->GetEDBFileDetails( &db, &mutex, filename );
121 :
122 0 : if( !db )
123 : {
124 0 : ThrowPCIDSKException("db == nullptr");
125 : }
126 : else
127 : {
128 0 : if( echannel < 0 || echannel > db->GetChannels() )
129 : {
130 0 : ThrowPCIDSKException( 0,
131 0 : "Invalid channel number: %d", echannel );
132 : }
133 :
134 0 : pixel_type = db->GetType(echannel);
135 :
136 : /* -------------------------------------------------------------------- */
137 : /* Capture the block size. */
138 : /* -------------------------------------------------------------------- */
139 0 : block_width = db->GetBlockWidth( echannel );
140 0 : if( block_width > width )
141 0 : block_width = width;
142 0 : block_height = db->GetBlockHeight( echannel );
143 0 : if( block_height > height )
144 0 : block_height = height;
145 :
146 0 : blocks_per_row = (GetWidth() + block_width - 1) / block_width;
147 : }
148 : }
149 :
150 : /************************************************************************/
151 : /* GetType() */
152 : /************************************************************************/
153 :
154 0 : eChanType CExternalChannel::GetType() const
155 : {
156 0 : AccessDB();
157 :
158 0 : return pixel_type;
159 : }
160 :
161 : /************************************************************************/
162 : /* GetBlockWidth() */
163 : /************************************************************************/
164 :
165 0 : int CExternalChannel::GetBlockWidth() const
166 :
167 : {
168 0 : AccessDB();
169 :
170 0 : return block_width;
171 : }
172 :
173 : /************************************************************************/
174 : /* GetBlockHeight() */
175 : /************************************************************************/
176 :
177 0 : int CExternalChannel::GetBlockHeight() const
178 :
179 : {
180 0 : AccessDB();
181 :
182 0 : return block_height;
183 : }
184 :
185 : /************************************************************************/
186 : /* ReadBlock() */
187 : /************************************************************************/
188 :
189 0 : int CExternalChannel::ReadBlock( int block_index, void *buffer,
190 : int xoff, int yoff,
191 : int xsize, int ysize )
192 :
193 : {
194 0 : AccessDB();
195 :
196 : /* -------------------------------------------------------------------- */
197 : /* Default window if needed. */
198 : /* -------------------------------------------------------------------- */
199 0 : if( xoff == -1 && yoff == -1 && xsize == -1 && ysize == -1 )
200 : {
201 0 : xoff = 0;
202 0 : yoff = 0;
203 0 : xsize = GetBlockWidth();
204 0 : ysize = GetBlockHeight();
205 : }
206 :
207 : /* -------------------------------------------------------------------- */
208 : /* Validate Window */
209 : /* -------------------------------------------------------------------- */
210 0 : if( xoff < 0 || xoff + xsize > GetBlockWidth()
211 0 : || yoff < 0 || yoff + ysize > GetBlockHeight() )
212 : {
213 0 : return ThrowPCIDSKException( 0,
214 : "Invalid window in ReadBlock(): xoff=%d,yoff=%d,xsize=%d,ysize=%d",
215 0 : xoff, yoff, xsize, ysize );
216 : }
217 :
218 : /* -------------------------------------------------------------------- */
219 : /* Do a direct call for the simplest case of 1:1 block mapping. */
220 : /* -------------------------------------------------------------------- */
221 0 : if( exoff == 0 && eyoff == 0
222 0 : && exsize == db->GetWidth()
223 0 : && eysize == db->GetHeight() )
224 : {
225 0 : MutexHolder oHolder( mutex );
226 0 : return db->ReadBlock( echannel, block_index, buffer,
227 0 : xoff, yoff, xsize, ysize );
228 : }
229 :
230 : /* ==================================================================== */
231 : /* Otherwise we need to break this down into potentially up to */
232 : /* four requests against the source file. */
233 : /* ==================================================================== */
234 0 : int src_block_width = db->GetBlockWidth( echannel );
235 0 : int src_block_height = db->GetBlockHeight( echannel );
236 0 : int src_blocks_per_row = (db->GetWidth() + src_block_width - 1)
237 0 : / src_block_width;
238 0 : int pixel_size = DataTypeSize(GetType());
239 0 : std::vector<uint8> temp_buffer_vec;
240 : try
241 : {
242 0 : temp_buffer_vec.resize(static_cast<size_t>(src_block_width)*src_block_height*pixel_size);
243 : }
244 0 : catch( const std::exception& )
245 : {
246 0 : return ThrowPCIDSKException(0, "Failed to allocate temporary block buffer." );
247 : }
248 0 : uint8 *temp_buffer = &temp_buffer_vec[0];
249 : int txoff, tyoff, txsize, tysize;
250 : int dst_blockx, dst_blocky;
251 :
252 0 : dst_blockx = block_index % blocks_per_row;
253 0 : dst_blocky = block_index / blocks_per_row;
254 :
255 : // what is the region of our desired data on the destination file?
256 :
257 0 : txoff = dst_blockx * block_width + exoff + xoff;
258 0 : tyoff = dst_blocky * block_height + eyoff + yoff;
259 0 : txsize = xsize;
260 0 : tysize = ysize;
261 :
262 : /* -------------------------------------------------------------------- */
263 : /* read external block for top left corner of target block. */
264 : /* -------------------------------------------------------------------- */
265 : int ablock_x, ablock_y, i_line;
266 : int axoff, ayoff, axsize, aysize;
267 0 : int block1_xsize=0, block1_ysize=0;
268 : int ttxoff, ttyoff, ttxsize, ttysize;
269 :
270 0 : ttxoff = txoff;
271 0 : ttyoff = tyoff;
272 0 : ttxsize = txsize;
273 0 : ttysize = tysize;
274 :
275 0 : ablock_x = ttxoff / src_block_width;
276 0 : ablock_y = ttyoff / src_block_height;
277 :
278 0 : axoff = ttxoff - ablock_x * src_block_width;
279 0 : ayoff = ttyoff - ablock_y * src_block_height;
280 :
281 0 : if( axoff + ttxsize > src_block_width )
282 0 : axsize = src_block_width - axoff;
283 : else
284 0 : axsize = ttxsize;
285 :
286 0 : if( ayoff + ttysize > src_block_height )
287 0 : aysize = src_block_height - ayoff;
288 : else
289 0 : aysize = ttysize;
290 :
291 0 : if( axsize > 0 )
292 0 : block1_xsize = axsize;
293 : else
294 0 : block1_xsize = 0;
295 :
296 0 : if( aysize > 0 )
297 0 : block1_ysize = aysize;
298 : else
299 0 : block1_ysize = 0;
300 :
301 0 : if( axsize > 0 && aysize > 0 )
302 : {
303 0 : MutexHolder oHolder( mutex );
304 0 : if( src_blocks_per_row > 0 &&
305 0 : (ablock_y > INT_MAX / src_blocks_per_row ||
306 0 : ablock_y * src_blocks_per_row > INT_MAX - ablock_x) )
307 : {
308 0 : ThrowPCIDSKException(0, "Integer overflow." );
309 : }
310 0 : db->ReadBlock( echannel, ablock_x + ablock_y * src_blocks_per_row,
311 0 : temp_buffer, axoff, ayoff, axsize, aysize );
312 :
313 0 : for( i_line = 0; i_line < aysize; i_line++ )
314 : {
315 0 : memcpy( ((uint8*) buffer) + i_line * xsize * pixel_size,
316 0 : temp_buffer + i_line * axsize * pixel_size,
317 0 : static_cast<size_t>(axsize) * pixel_size );
318 : }
319 : }
320 :
321 : /* -------------------------------------------------------------------- */
322 : /* read external block for top right corner of target block. */
323 : /* -------------------------------------------------------------------- */
324 0 : ttxoff = txoff + block1_xsize;
325 0 : ttyoff = tyoff;
326 0 : ttxsize = txsize - block1_xsize;
327 0 : ttysize = tysize;
328 :
329 0 : ablock_x = ttxoff / src_block_width;
330 0 : ablock_y = ttyoff / src_block_height;
331 :
332 0 : axoff = ttxoff - ablock_x * src_block_width;
333 0 : ayoff = ttyoff - ablock_y * src_block_height;
334 :
335 0 : if( axoff + ttxsize > src_block_width )
336 0 : axsize = src_block_width - axoff;
337 : else
338 0 : axsize = ttxsize;
339 :
340 0 : if( ayoff + ttysize > src_block_height )
341 0 : aysize = src_block_height - ayoff;
342 : else
343 0 : aysize = ttysize;
344 :
345 0 : if( axsize > 0 && aysize > 0 )
346 : {
347 0 : MutexHolder oHolder( mutex );
348 0 : db->ReadBlock( echannel, ablock_x + ablock_y * src_blocks_per_row,
349 0 : temp_buffer, axoff, ayoff, axsize, aysize );
350 :
351 0 : for( i_line = 0; i_line < aysize; i_line++ )
352 : {
353 0 : memcpy( ((uint8*) buffer)
354 0 : + (block1_xsize + i_line * xsize) * pixel_size,
355 0 : temp_buffer + i_line * axsize * pixel_size,
356 0 : static_cast<size_t>(axsize) * pixel_size );
357 : }
358 : }
359 :
360 : /* -------------------------------------------------------------------- */
361 : /* read external block for bottom left corner of target block. */
362 : /* -------------------------------------------------------------------- */
363 0 : ttxoff = txoff;
364 0 : ttyoff = tyoff + block1_ysize;
365 0 : ttxsize = txsize;
366 0 : ttysize = tysize - block1_ysize;
367 :
368 0 : ablock_x = ttxoff / src_block_width;
369 0 : ablock_y = ttyoff / src_block_height;
370 :
371 0 : axoff = ttxoff - ablock_x * src_block_width;
372 0 : ayoff = ttyoff - ablock_y * src_block_height;
373 :
374 0 : if( axoff + ttxsize > src_block_width )
375 0 : axsize = src_block_width - axoff;
376 : else
377 0 : axsize = ttxsize;
378 :
379 0 : if( ayoff + ttysize > src_block_height )
380 0 : aysize = src_block_height - ayoff;
381 : else
382 0 : aysize = ttysize;
383 :
384 0 : if( axsize > 0 && aysize > 0 )
385 : {
386 0 : MutexHolder oHolder( mutex );
387 0 : db->ReadBlock( echannel, ablock_x + ablock_y * src_blocks_per_row,
388 0 : temp_buffer, axoff, ayoff, axsize, aysize );
389 :
390 0 : for( i_line = 0; i_line < aysize; i_line++ )
391 : {
392 0 : memcpy( ((uint8*) buffer)
393 0 : + (i_line + block1_ysize) * xsize * pixel_size,
394 0 : temp_buffer + i_line * axsize * pixel_size,
395 0 : static_cast<size_t>(axsize) * pixel_size );
396 : }
397 : }
398 :
399 : /* -------------------------------------------------------------------- */
400 : /* read external block for bottom left corner of target block. */
401 : /* -------------------------------------------------------------------- */
402 0 : ttxoff = txoff + block1_xsize;
403 0 : ttyoff = tyoff + block1_ysize;
404 0 : ttxsize = txsize - block1_xsize;
405 0 : ttysize = tysize - block1_ysize;
406 :
407 0 : ablock_x = ttxoff / src_block_width;
408 0 : ablock_y = ttyoff / src_block_height;
409 :
410 0 : axoff = ttxoff - ablock_x * src_block_width;
411 0 : ayoff = ttyoff - ablock_y * src_block_height;
412 :
413 0 : if( axoff + ttxsize > src_block_width )
414 0 : axsize = src_block_width - axoff;
415 : else
416 0 : axsize = ttxsize;
417 :
418 0 : if( ayoff + ttysize > src_block_height )
419 0 : aysize = src_block_height - ayoff;
420 : else
421 0 : aysize = ttysize;
422 :
423 0 : if( axsize > 0 && aysize > 0 )
424 : {
425 0 : MutexHolder oHolder( mutex );
426 0 : db->ReadBlock( echannel, ablock_x + ablock_y * src_blocks_per_row,
427 0 : temp_buffer, axoff, ayoff, axsize, aysize );
428 :
429 0 : for( i_line = 0; i_line < aysize; i_line++ )
430 : {
431 0 : memcpy( ((uint8*) buffer)
432 0 : + (block1_xsize + (i_line + block1_ysize) * xsize) * pixel_size,
433 0 : temp_buffer + i_line * axsize * pixel_size,
434 0 : static_cast<size_t>(axsize) * pixel_size );
435 : }
436 : }
437 :
438 0 : return 1;
439 : }
440 :
441 : /************************************************************************/
442 : /* WriteBlock() */
443 : /************************************************************************/
444 :
445 0 : int CExternalChannel::WriteBlock( int block_index, void *buffer )
446 :
447 : {
448 0 : AccessDB();
449 :
450 0 : if( !file->GetUpdatable() || !writable )
451 0 : return ThrowPCIDSKException(0, "File not open for update in WriteBlock()" );
452 :
453 : /* -------------------------------------------------------------------- */
454 : /* Pass the request on directly in the simple case. */
455 : /* -------------------------------------------------------------------- */
456 0 : if( exoff == 0 && eyoff == 0
457 0 : && exsize == db->GetWidth()
458 0 : && eysize == db->GetHeight() )
459 : {
460 0 : MutexHolder oHolder( mutex );
461 0 : return db->WriteBlock( echannel, block_index, buffer );
462 : }
463 :
464 : /* ==================================================================== */
465 : /* Otherwise we need to break this down into potentially up to */
466 : /* four requests against the source file. */
467 : /* ==================================================================== */
468 0 : int src_block_width = db->GetBlockWidth( echannel );
469 0 : int src_block_height = db->GetBlockHeight( echannel );
470 0 : int src_blocks_per_row = (db->GetWidth() + src_block_width - 1)
471 0 : / src_block_width;
472 0 : int pixel_size = DataTypeSize(GetType());
473 0 : uint8 *temp_buffer = (uint8 *) calloc(static_cast<size_t>(src_block_width)*src_block_height,
474 : pixel_size);
475 : int txoff, tyoff, txsize, tysize;
476 : int dst_blockx, dst_blocky;
477 :
478 0 : if( temp_buffer == nullptr )
479 0 : return ThrowPCIDSKException(0, "Failed to allocate temporary block buffer." );
480 :
481 0 : dst_blockx = block_index % blocks_per_row;
482 0 : dst_blocky = block_index / blocks_per_row;
483 :
484 : // what is the region of our desired data on the destination file?
485 :
486 0 : txoff = dst_blockx * block_width + exoff;
487 0 : tyoff = dst_blocky * block_height + eyoff;
488 0 : txsize = block_width;
489 0 : tysize = block_height;
490 :
491 : /* -------------------------------------------------------------------- */
492 : /* process external block for top left corner of target block. */
493 : /* -------------------------------------------------------------------- */
494 : int ablock_x, ablock_y, i_line;
495 : int axoff, ayoff, axsize, aysize;
496 0 : int block1_xsize=0, block1_ysize=0;
497 : int ttxoff, ttyoff, ttxsize, ttysize;
498 :
499 0 : ttxoff = txoff;
500 0 : ttyoff = tyoff;
501 0 : ttxsize = txsize;
502 0 : ttysize = tysize;
503 :
504 0 : ablock_x = ttxoff / src_block_width;
505 0 : ablock_y = ttyoff / src_block_height;
506 :
507 0 : axoff = ttxoff - ablock_x * src_block_width;
508 0 : ayoff = ttyoff - ablock_y * src_block_height;
509 :
510 0 : if( axoff + ttxsize > src_block_width )
511 0 : axsize = src_block_width - axoff;
512 : else
513 0 : axsize = ttxsize;
514 :
515 0 : if( ayoff + ttysize > src_block_height )
516 0 : aysize = src_block_height - ayoff;
517 : else
518 0 : aysize = ttysize;
519 :
520 0 : if( axsize > 0 )
521 0 : block1_xsize = axsize;
522 : else
523 0 : block1_xsize = 0;
524 :
525 0 : if( aysize > 0 )
526 0 : block1_ysize = aysize;
527 : else
528 0 : block1_ysize = 0;
529 :
530 0 : if( axsize > 0 && aysize > 0 )
531 : {
532 0 : MutexHolder oHolder( mutex );
533 0 : db->ReadBlock( echannel, ablock_x + ablock_y * src_blocks_per_row,
534 0 : temp_buffer );
535 :
536 0 : for( i_line = 0; i_line < aysize; i_line++ )
537 : {
538 0 : memcpy( temp_buffer
539 0 : + (i_line+ayoff) * src_block_width * pixel_size
540 0 : + axoff * pixel_size,
541 0 : ((uint8*) buffer) + i_line * block_width * pixel_size,
542 0 : static_cast<size_t>(axsize) * pixel_size );
543 : }
544 :
545 0 : db->WriteBlock( echannel, ablock_x + ablock_y * src_blocks_per_row,
546 0 : temp_buffer );
547 : }
548 :
549 : /* -------------------------------------------------------------------- */
550 : /* read external block for top right corner of target block. */
551 : /* -------------------------------------------------------------------- */
552 0 : ttxoff = txoff + block1_xsize;
553 0 : ttyoff = tyoff;
554 0 : ttxsize = txsize - block1_xsize;
555 0 : ttysize = tysize;
556 :
557 0 : ablock_x = ttxoff / src_block_width;
558 0 : ablock_y = ttyoff / src_block_height;
559 :
560 0 : axoff = ttxoff - ablock_x * src_block_width;
561 0 : ayoff = ttyoff - ablock_y * src_block_height;
562 :
563 0 : if( axoff + ttxsize > src_block_width )
564 0 : axsize = src_block_width - axoff;
565 : else
566 0 : axsize = ttxsize;
567 :
568 0 : if( ayoff + ttysize > src_block_height )
569 0 : aysize = src_block_height - ayoff;
570 : else
571 0 : aysize = ttysize;
572 :
573 0 : if( axsize > 0 && aysize > 0 )
574 : {
575 0 : MutexHolder oHolder( mutex );
576 0 : db->ReadBlock( echannel, ablock_x + ablock_y * src_blocks_per_row,
577 0 : temp_buffer );
578 :
579 0 : for( i_line = 0; i_line < aysize; i_line++ )
580 : {
581 0 : memcpy( temp_buffer
582 0 : + (i_line+ayoff) * src_block_width * pixel_size
583 0 : + axoff * pixel_size,
584 0 : ((uint8*) buffer) + i_line * block_width * pixel_size
585 0 : + block1_xsize * pixel_size,
586 0 : static_cast<size_t>(axsize) * pixel_size );
587 : }
588 :
589 0 : db->WriteBlock( echannel, ablock_x + ablock_y * src_blocks_per_row,
590 0 : temp_buffer );
591 : }
592 :
593 : /* -------------------------------------------------------------------- */
594 : /* read external block for bottom left corner of target block. */
595 : /* -------------------------------------------------------------------- */
596 0 : ttxoff = txoff;
597 0 : ttyoff = tyoff + block1_ysize;
598 0 : ttxsize = txsize;
599 0 : ttysize = tysize - block1_ysize;
600 :
601 0 : ablock_x = ttxoff / src_block_width;
602 0 : ablock_y = ttyoff / src_block_height;
603 :
604 0 : axoff = ttxoff - ablock_x * src_block_width;
605 0 : ayoff = ttyoff - ablock_y * src_block_height;
606 :
607 0 : if( axoff + ttxsize > src_block_width )
608 0 : axsize = src_block_width - axoff;
609 : else
610 0 : axsize = ttxsize;
611 :
612 0 : if( ayoff + ttysize > src_block_height )
613 0 : aysize = src_block_height - ayoff;
614 : else
615 0 : aysize = ttysize;
616 :
617 0 : if( axsize > 0 && aysize > 0 )
618 : {
619 0 : MutexHolder oHolder( mutex );
620 0 : db->ReadBlock( echannel, ablock_x + ablock_y * src_blocks_per_row,
621 0 : temp_buffer );
622 :
623 0 : for( i_line = 0; i_line < aysize; i_line++ )
624 : {
625 0 : memcpy( temp_buffer
626 0 : + (i_line+ayoff) * src_block_width * pixel_size
627 0 : + axoff * pixel_size,
628 : ((uint8*) buffer)
629 0 : + (i_line+block1_ysize) * block_width * pixel_size,
630 0 : static_cast<size_t>(axsize) * pixel_size );
631 : }
632 :
633 0 : db->WriteBlock( echannel, ablock_x + ablock_y * src_blocks_per_row,
634 0 : temp_buffer );
635 : }
636 :
637 : /* -------------------------------------------------------------------- */
638 : /* read external block for bottom left corner of target block. */
639 : /* -------------------------------------------------------------------- */
640 0 : ttxoff = txoff + block1_xsize;
641 0 : ttyoff = tyoff + block1_ysize;
642 0 : ttxsize = txsize - block1_xsize;
643 0 : ttysize = tysize - block1_ysize;
644 :
645 0 : ablock_x = ttxoff / src_block_width;
646 0 : ablock_y = ttyoff / src_block_height;
647 :
648 0 : axoff = ttxoff - ablock_x * src_block_width;
649 0 : ayoff = ttyoff - ablock_y * src_block_height;
650 :
651 0 : if( axoff + ttxsize > src_block_width )
652 0 : axsize = src_block_width - axoff;
653 : else
654 0 : axsize = ttxsize;
655 :
656 0 : if( ayoff + ttysize > src_block_height )
657 0 : aysize = src_block_height - ayoff;
658 : else
659 0 : aysize = ttysize;
660 :
661 0 : if( axsize > 0 && aysize > 0 )
662 : {
663 0 : MutexHolder oHolder( mutex );
664 0 : db->ReadBlock( echannel, ablock_x + ablock_y * src_blocks_per_row,
665 0 : temp_buffer );
666 :
667 0 : for( i_line = 0; i_line < aysize; i_line++ )
668 : {
669 0 : memcpy( temp_buffer
670 0 : + (i_line+ayoff) * src_block_width * pixel_size
671 0 : + axoff * pixel_size,
672 : ((uint8*) buffer)
673 0 : + (i_line+block1_ysize) * block_width * pixel_size
674 0 : + block1_xsize * pixel_size,
675 0 : static_cast<size_t>(axsize) * pixel_size );
676 : }
677 :
678 0 : db->WriteBlock( echannel, ablock_x + ablock_y * src_blocks_per_row,
679 0 : temp_buffer );
680 : }
681 :
682 0 : free( temp_buffer );
683 :
684 0 : return 1;
685 : }
686 :
687 : /************************************************************************/
688 : /* GetEChanInfo() */
689 : /************************************************************************/
690 0 : void CExternalChannel::GetEChanInfo( std::string &filenameOut, int &echannelOut,
691 : int &exoffOut, int &eyoffOut,
692 : int &exsizeOut, int &eysizeOut ) const
693 :
694 : {
695 0 : echannelOut = this->echannel;
696 0 : exoffOut = this->exoff;
697 0 : eyoffOut = this->eyoff;
698 0 : exsizeOut = this->exsize;
699 0 : eysizeOut = this->eysize;
700 0 : filenameOut = this->filename;
701 0 : }
702 :
703 : /************************************************************************/
704 : /* SetEChanInfo() */
705 : /************************************************************************/
706 :
707 0 : void CExternalChannel::SetEChanInfo( std::string filenameIn, int echannelIn,
708 : int exoffIn, int eyoffIn,
709 : int exsizeIn, int eysizeIn )
710 :
711 : {
712 0 : if( ih_offset == 0 )
713 0 : return ThrowPCIDSKException( "No Image Header available for this channel." );
714 :
715 : /* -------------------------------------------------------------------- */
716 : /* Fetch the existing image header. */
717 : /* -------------------------------------------------------------------- */
718 0 : PCIDSKBuffer ih(1024);
719 :
720 0 : file->ReadFromFile( ih.buffer, ih_offset, 1024 );
721 :
722 : /* -------------------------------------------------------------------- */
723 : /* If the linked filename is too long to fit in the 64 */
724 : /* character IHi.2 field, then we need to use a link segment to */
725 : /* store the filename. */
726 : /* -------------------------------------------------------------------- */
727 0 : std::string IHi2_filename;
728 :
729 0 : if( filenameIn.size() > 64 )
730 : {
731 : int link_segment;
732 :
733 0 : ih.Get( 64, 64, IHi2_filename );
734 :
735 0 : if( IHi2_filename.substr(0,3) == "LNK" )
736 : {
737 0 : link_segment = std::atoi( IHi2_filename.c_str() + 4 );
738 : }
739 : else
740 : {
741 : char link_filename[64];
742 :
743 : link_segment =
744 0 : file->CreateSegment( "Link ",
745 : "Long external channel filename link.",
746 : SEG_SYS, 1 );
747 :
748 0 : snprintf( link_filename, sizeof(link_filename), "LNK %4d", link_segment );
749 0 : IHi2_filename = link_filename;
750 : }
751 :
752 : CLinkSegment *link =
753 0 : dynamic_cast<CLinkSegment*>( file->GetSegment( link_segment ) );
754 :
755 0 : if( link != nullptr )
756 : {
757 0 : link->SetPath( filenameIn );
758 0 : link->Synchronize();
759 : }
760 : }
761 :
762 : /* -------------------------------------------------------------------- */
763 : /* If we used to have a link segment but no longer need it, we */
764 : /* need to delete the link segment. */
765 : /* -------------------------------------------------------------------- */
766 : else
767 : {
768 0 : ih.Get( 64, 64, IHi2_filename );
769 :
770 0 : if( IHi2_filename.substr(0,3) == "LNK" )
771 : {
772 0 : int link_segment = std::atoi( IHi2_filename.c_str() + 4 );
773 :
774 0 : file->DeleteSegment( link_segment );
775 : }
776 :
777 0 : IHi2_filename = filenameIn;
778 : }
779 :
780 : /* -------------------------------------------------------------------- */
781 : /* Update the image header. */
782 : /* -------------------------------------------------------------------- */
783 : // IHi.2
784 0 : ih.Put( IHi2_filename.c_str(), 64, 64 );
785 :
786 : // IHi.6.1
787 0 : ih.Put( "", 168, 16 );
788 :
789 : // IHi.6.2
790 0 : ih.Put( "", 184, 8 );
791 :
792 : // IHi.6.3
793 0 : ih.Put( "", 192, 8 );
794 :
795 : // IHi.6.5
796 0 : ih.Put( "", 201, 1 );
797 :
798 : // IHi.6.7
799 0 : ih.Put( exoffIn, 250, 8 );
800 :
801 : // IHi.6.8
802 0 : ih.Put( eyoffIn, 258, 8 );
803 :
804 : // IHi.6.9
805 0 : ih.Put( exsizeIn, 266, 8 );
806 :
807 : // IHi.6.10
808 0 : ih.Put( eysizeIn, 274, 8 );
809 :
810 : // IHi.6.11
811 0 : ih.Put( echannelIn, 282, 8 );
812 :
813 0 : file->WriteToFile( ih.buffer, ih_offset, 1024 );
814 :
815 : /* -------------------------------------------------------------------- */
816 : /* Update local configuration. */
817 : /* -------------------------------------------------------------------- */
818 0 : this->filename = file->GetInterfaces()->MergeRelativePath( file->GetInterfaces()->io,
819 0 : file->GetFilename(),
820 0 : filenameIn );
821 :
822 0 : this->exoff = exoffIn;
823 0 : this->eyoff = eyoffIn;
824 0 : this->exsize = exsizeIn;
825 0 : this->eysize = eysizeIn;
826 0 : this->echannel = echannelIn;
827 : }
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