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, 50 West Wilmot Street, Richmond Hill, Ont, 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 :
47 : using namespace PCIDSK;
48 :
49 : /************************************************************************/
50 : /* CExternalChannel() */
51 : /************************************************************************/
52 :
53 0 : CExternalChannel::CExternalChannel( PCIDSKBuffer &image_header,
54 : uint64 ih_offset,
55 : PCIDSKBuffer &file_header,
56 : std::string filename,
57 : int channelnum,
58 : CPCIDSKFile *file,
59 : eChanType pixel_type )
60 0 : : CPCIDSKChannel( image_header, ih_offset, file, pixel_type, channelnum)
61 :
62 : {
63 0 : db = NULL;
64 0 : mutex = NULL;
65 :
66 : /* -------------------------------------------------------------------- */
67 : /* Establish the data window. */
68 : /* -------------------------------------------------------------------- */
69 0 : exoff = atoi(image_header.Get( 250, 8 ));
70 0 : eyoff = atoi(image_header.Get( 258, 8 ));
71 0 : exsize = atoi(image_header.Get( 266, 8 ));
72 0 : eysize = atoi(image_header.Get( 274, 8 ));
73 :
74 0 : echannel = atoi(image_header.Get( 282, 8 ));
75 :
76 0 : if (echannel == 0) {
77 0 : echannel = channelnum;
78 : }
79 :
80 : /* -------------------------------------------------------------------- */
81 : /* Establish the file we will be accessing. */
82 : /* -------------------------------------------------------------------- */
83 0 : if( filename != "" )
84 0 : this->filename = filename;
85 : else
86 0 : image_header.Get(64,64,this->filename);
87 0 : }
88 :
89 : /************************************************************************/
90 : /* ~CExternalChannel() */
91 : /************************************************************************/
92 :
93 0 : CExternalChannel::~CExternalChannel()
94 :
95 : {
96 : // no need to deaccess the EDBFile - the file is responsible for that.
97 0 : }
98 :
99 : /************************************************************************/
100 : /* AccessDB() */
101 : /************************************************************************/
102 :
103 0 : void CExternalChannel::AccessDB() const
104 :
105 : {
106 0 : if( db != NULL )
107 0 : return;
108 :
109 : /* -------------------------------------------------------------------- */
110 : /* open, or fetch an already open file handle. */
111 : /* -------------------------------------------------------------------- */
112 0 : writable = file->GetEDBFileDetails( &db, &mutex, filename );
113 :
114 : /* -------------------------------------------------------------------- */
115 : /* Capture the block size. */
116 : /* -------------------------------------------------------------------- */
117 0 : block_width = db->GetBlockWidth( echannel );
118 0 : if( block_width > width )
119 0 : block_width = width;
120 0 : block_height = db->GetBlockHeight( echannel );
121 0 : if( block_height > height )
122 0 : block_height = height;
123 :
124 0 : blocks_per_row = (GetWidth() + block_width - 1) / block_width;
125 : }
126 :
127 : /************************************************************************/
128 : /* GetBlockWidth() */
129 : /************************************************************************/
130 :
131 0 : int CExternalChannel::GetBlockWidth() const
132 :
133 : {
134 0 : AccessDB();
135 :
136 0 : return block_width;
137 : }
138 :
139 : /************************************************************************/
140 : /* GetBlockHeight() */
141 : /************************************************************************/
142 :
143 0 : int CExternalChannel::GetBlockHeight() const
144 :
145 : {
146 0 : AccessDB();
147 :
148 0 : return block_height;
149 : }
150 :
151 : /************************************************************************/
152 : /* ReadBlock() */
153 : /************************************************************************/
154 :
155 0 : int CExternalChannel::ReadBlock( int block_index, void *buffer,
156 : int xoff, int yoff,
157 : int xsize, int ysize )
158 :
159 : {
160 0 : AccessDB();
161 :
162 : /* -------------------------------------------------------------------- */
163 : /* Default window if needed. */
164 : /* -------------------------------------------------------------------- */
165 0 : if( xoff == -1 && yoff == -1 && xsize == -1 && ysize == -1 )
166 : {
167 0 : xoff = 0;
168 0 : yoff = 0;
169 0 : xsize = GetBlockWidth();
170 0 : ysize = GetBlockHeight();
171 : }
172 :
173 : /* -------------------------------------------------------------------- */
174 : /* Validate Window */
175 : /* -------------------------------------------------------------------- */
176 0 : if( xoff < 0 || xoff + xsize > GetBlockWidth()
177 0 : || yoff < 0 || yoff + ysize > GetBlockHeight() )
178 : {
179 : ThrowPCIDSKException(
180 : "Invalid window in ReadBlock(): xoff=%d,yoff=%d,xsize=%d,ysize=%d",
181 0 : xoff, yoff, xsize, ysize );
182 : }
183 :
184 : /* -------------------------------------------------------------------- */
185 : /* Do a direct call for the simpliest case of 1:1 block mapping. */
186 : /* -------------------------------------------------------------------- */
187 0 : if( exoff == 0 && eyoff == 0
188 0 : && exsize == db->GetWidth()
189 0 : && eysize == db->GetHeight() )
190 : {
191 0 : MutexHolder oHolder( mutex );
192 : return db->ReadBlock( echannel, block_index, buffer,
193 0 : xoff, yoff, xsize, ysize );
194 : }
195 :
196 : /* ==================================================================== */
197 : /* Otherwise we need to break this down into potentially up to */
198 : /* four requests against the source file. */
199 : /* ==================================================================== */
200 0 : int src_block_width = db->GetBlockWidth( echannel );
201 0 : int src_block_height = db->GetBlockHeight( echannel );
202 0 : int src_blocks_per_row = (db->GetWidth() + src_block_width - 1)
203 0 : / src_block_width;
204 0 : int pixel_size = DataTypeSize(GetType());
205 : uint8 *temp_buffer = (uint8 *) calloc(src_block_width*src_block_height,
206 0 : pixel_size);
207 : int txoff, tyoff, txsize, tysize;
208 : int dst_blockx, dst_blocky;
209 :
210 0 : if( temp_buffer == NULL )
211 0 : ThrowPCIDSKException( "Failed to allocate temporary block buffer." );
212 :
213 0 : dst_blockx = block_index % blocks_per_row;
214 0 : dst_blocky = block_index / blocks_per_row;
215 :
216 : // what is the region of our desired data on the destination file?
217 :
218 0 : txoff = dst_blockx * block_width + exoff + xoff;
219 0 : tyoff = dst_blocky * block_height + eyoff + yoff;
220 0 : txsize = xsize;
221 0 : tysize = ysize;
222 :
223 : /* -------------------------------------------------------------------- */
224 : /* read external block for top left corner of target block. */
225 : /* -------------------------------------------------------------------- */
226 : int ablock_x, ablock_y, i_line;
227 : int axoff, ayoff, axsize, aysize;
228 0 : int block1_xsize=0, block1_ysize=0;
229 : int ttxoff, ttyoff, ttxsize, ttysize;
230 :
231 0 : ttxoff = txoff;
232 0 : ttyoff = tyoff;
233 0 : ttxsize = txsize;
234 0 : ttysize = tysize;
235 :
236 0 : ablock_x = ttxoff / src_block_width;
237 0 : ablock_y = ttyoff / src_block_height;
238 :
239 0 : axoff = ttxoff - ablock_x * src_block_width;
240 0 : ayoff = ttyoff - ablock_y * src_block_height;
241 :
242 0 : if( axoff + ttxsize > src_block_width )
243 0 : axsize = src_block_width - axoff;
244 : else
245 0 : axsize = ttxsize;
246 :
247 0 : if( ayoff + ttysize > src_block_height )
248 0 : aysize = src_block_height - ayoff;
249 : else
250 0 : aysize = ttysize;
251 :
252 0 : if( axsize > 0 )
253 0 : block1_xsize = axsize;
254 : else
255 0 : block1_xsize = 0;
256 :
257 0 : if( aysize > 0 )
258 0 : block1_ysize = aysize;
259 : else
260 0 : block1_ysize = 0;
261 :
262 0 : if( axsize > 0 && aysize > 0 )
263 : {
264 0 : MutexHolder oHolder( mutex );
265 : db->ReadBlock( echannel, ablock_x + ablock_y * src_blocks_per_row,
266 0 : temp_buffer, axoff, ayoff, axsize, aysize );
267 :
268 0 : for( i_line = 0; i_line < aysize; i_line++ )
269 : {
270 : memcpy( ((uint8*) buffer) + i_line * xsize * pixel_size,
271 : temp_buffer + i_line * axsize * pixel_size,
272 0 : axsize * pixel_size );
273 0 : }
274 : }
275 :
276 : /* -------------------------------------------------------------------- */
277 : /* read external block for top right corner of target block. */
278 : /* -------------------------------------------------------------------- */
279 0 : ttxoff = txoff + block1_xsize;
280 0 : ttyoff = tyoff;
281 0 : ttxsize = txsize - block1_xsize;
282 0 : ttysize = tysize;
283 :
284 0 : ablock_x = ttxoff / src_block_width;
285 0 : ablock_y = ttyoff / src_block_height;
286 :
287 0 : axoff = ttxoff - ablock_x * src_block_width;
288 0 : ayoff = ttyoff - ablock_y * src_block_height;
289 :
290 0 : if( axoff + ttxsize > src_block_width )
291 0 : axsize = src_block_width - axoff;
292 : else
293 0 : axsize = ttxsize;
294 :
295 0 : if( ayoff + ttysize > src_block_height )
296 0 : aysize = src_block_height - ayoff;
297 : else
298 0 : aysize = ttysize;
299 :
300 0 : if( axsize > 0 && aysize > 0 )
301 : {
302 0 : MutexHolder oHolder( mutex );
303 : db->ReadBlock( echannel, ablock_x + ablock_y * src_blocks_per_row,
304 0 : temp_buffer, axoff, ayoff, axsize, aysize );
305 :
306 0 : for( i_line = 0; i_line < aysize; i_line++ )
307 : {
308 : memcpy( ((uint8*) buffer)
309 : + (block1_xsize + i_line * xsize) * pixel_size,
310 : temp_buffer + i_line * axsize * pixel_size,
311 0 : axsize * pixel_size );
312 0 : }
313 : }
314 :
315 : /* -------------------------------------------------------------------- */
316 : /* read external block for bottom left corner of target block. */
317 : /* -------------------------------------------------------------------- */
318 0 : ttxoff = txoff;
319 0 : ttyoff = tyoff + block1_ysize;
320 0 : ttxsize = txsize;
321 0 : ttysize = tysize - block1_ysize;
322 :
323 0 : ablock_x = ttxoff / src_block_width;
324 0 : ablock_y = ttyoff / src_block_height;
325 :
326 0 : axoff = ttxoff - ablock_x * src_block_width;
327 0 : ayoff = ttyoff - ablock_y * src_block_height;
328 :
329 0 : if( axoff + ttxsize > src_block_width )
330 0 : axsize = src_block_width - axoff;
331 : else
332 0 : axsize = ttxsize;
333 :
334 0 : if( ayoff + ttysize > src_block_height )
335 0 : aysize = src_block_height - ayoff;
336 : else
337 0 : aysize = ttysize;
338 :
339 0 : if( axsize > 0 && aysize > 0 )
340 : {
341 0 : MutexHolder oHolder( mutex );
342 : db->ReadBlock( echannel, ablock_x + ablock_y * src_blocks_per_row,
343 0 : temp_buffer, axoff, ayoff, axsize, aysize );
344 :
345 0 : for( i_line = 0; i_line < aysize; i_line++ )
346 : {
347 : memcpy( ((uint8*) buffer)
348 : + (i_line + block1_ysize) * xsize * pixel_size,
349 : temp_buffer + i_line * axsize * pixel_size,
350 0 : axsize * pixel_size );
351 0 : }
352 : }
353 :
354 : /* -------------------------------------------------------------------- */
355 : /* read external block for bottom left corner of target block. */
356 : /* -------------------------------------------------------------------- */
357 0 : ttxoff = txoff + block1_xsize;
358 0 : ttyoff = tyoff + block1_ysize;
359 0 : ttxsize = txsize - block1_xsize;
360 0 : ttysize = tysize - block1_ysize;
361 :
362 0 : ablock_x = ttxoff / src_block_width;
363 0 : ablock_y = ttyoff / src_block_height;
364 :
365 0 : axoff = ttxoff - ablock_x * src_block_width;
366 0 : ayoff = ttyoff - ablock_y * src_block_height;
367 :
368 0 : if( axoff + ttxsize > src_block_width )
369 0 : axsize = src_block_width - axoff;
370 : else
371 0 : axsize = ttxsize;
372 :
373 0 : if( ayoff + ttysize > src_block_height )
374 0 : aysize = src_block_height - ayoff;
375 : else
376 0 : aysize = ttysize;
377 :
378 0 : if( axsize > 0 && aysize > 0 )
379 : {
380 0 : MutexHolder oHolder( mutex );
381 : db->ReadBlock( echannel, ablock_x + ablock_y * src_blocks_per_row,
382 0 : temp_buffer, axoff, ayoff, axsize, aysize );
383 :
384 0 : for( i_line = 0; i_line < aysize; i_line++ )
385 : {
386 : memcpy( ((uint8*) buffer)
387 : + (block1_xsize + (i_line + block1_ysize) * xsize) * pixel_size,
388 : temp_buffer + i_line * axsize * pixel_size,
389 0 : axsize * pixel_size );
390 0 : }
391 : }
392 :
393 0 : free( temp_buffer );
394 :
395 0 : return 1;
396 : }
397 :
398 : /************************************************************************/
399 : /* WriteBlock() */
400 : /************************************************************************/
401 :
402 0 : int CExternalChannel::WriteBlock( int block_index, void *buffer )
403 :
404 : {
405 0 : AccessDB();
406 :
407 0 : if( !file->GetUpdatable() || !writable )
408 0 : throw PCIDSKException( "File not open for update in WriteBlock()" );
409 :
410 : /* -------------------------------------------------------------------- */
411 : /* Pass the request on directly in the simple case. */
412 : /* -------------------------------------------------------------------- */
413 0 : if( exoff == 0 && eyoff == 0
414 0 : && exsize == db->GetWidth()
415 0 : && eysize == db->GetHeight() )
416 : {
417 0 : MutexHolder oHolder( mutex );
418 0 : return db->WriteBlock( echannel, block_index, buffer );
419 : }
420 :
421 : /* ==================================================================== */
422 : /* Otherwise we need to break this down into potentially up to */
423 : /* four requests against the source file. */
424 : /* ==================================================================== */
425 0 : int src_block_width = db->GetBlockWidth( echannel );
426 0 : int src_block_height = db->GetBlockHeight( echannel );
427 0 : int src_blocks_per_row = (db->GetWidth() + src_block_width - 1)
428 0 : / src_block_width;
429 0 : int pixel_size = DataTypeSize(GetType());
430 : uint8 *temp_buffer = (uint8 *) calloc(src_block_width*src_block_height,
431 0 : pixel_size);
432 : int txoff, tyoff, txsize, tysize;
433 : int dst_blockx, dst_blocky;
434 :
435 0 : if( temp_buffer == NULL )
436 0 : ThrowPCIDSKException( "Failed to allocate temporary block buffer." );
437 :
438 0 : dst_blockx = block_index % blocks_per_row;
439 0 : dst_blocky = block_index / blocks_per_row;
440 :
441 : // what is the region of our desired data on the destination file?
442 :
443 0 : txoff = dst_blockx * block_width + exoff;
444 0 : tyoff = dst_blocky * block_height + eyoff;
445 0 : txsize = block_width;
446 0 : tysize = block_height;
447 :
448 : /* -------------------------------------------------------------------- */
449 : /* process external block for top left corner of target block. */
450 : /* -------------------------------------------------------------------- */
451 : int ablock_x, ablock_y, i_line;
452 : int axoff, ayoff, axsize, aysize;
453 0 : int block1_xsize=0, block1_ysize=0;
454 : int ttxoff, ttyoff, ttxsize, ttysize;
455 :
456 0 : ttxoff = txoff;
457 0 : ttyoff = tyoff;
458 0 : ttxsize = txsize;
459 0 : ttysize = tysize;
460 :
461 0 : ablock_x = ttxoff / src_block_width;
462 0 : ablock_y = ttyoff / src_block_height;
463 :
464 0 : axoff = ttxoff - ablock_x * src_block_width;
465 0 : ayoff = ttyoff - ablock_y * src_block_height;
466 :
467 0 : if( axoff + ttxsize > src_block_width )
468 0 : axsize = src_block_width - axoff;
469 : else
470 0 : axsize = ttxsize;
471 :
472 0 : if( ayoff + ttysize > src_block_height )
473 0 : aysize = src_block_height - ayoff;
474 : else
475 0 : aysize = ttysize;
476 :
477 0 : if( axsize > 0 )
478 0 : block1_xsize = axsize;
479 : else
480 0 : block1_xsize = 0;
481 :
482 0 : if( aysize > 0 )
483 0 : block1_ysize = aysize;
484 : else
485 0 : block1_ysize = 0;
486 :
487 0 : if( axsize > 0 && aysize > 0 )
488 : {
489 0 : MutexHolder oHolder( mutex );
490 : db->ReadBlock( echannel, ablock_x + ablock_y * src_blocks_per_row,
491 0 : temp_buffer );
492 :
493 0 : for( i_line = 0; i_line < aysize; i_line++ )
494 : {
495 : memcpy( temp_buffer
496 : + (i_line+ayoff) * src_block_width * pixel_size
497 : + axoff * pixel_size,
498 : ((uint8*) buffer) + i_line * block_width * pixel_size,
499 0 : axsize * pixel_size );
500 : }
501 :
502 : db->WriteBlock( echannel, ablock_x + ablock_y * src_blocks_per_row,
503 0 : temp_buffer );
504 : }
505 :
506 : /* -------------------------------------------------------------------- */
507 : /* read external block for top right corner of target block. */
508 : /* -------------------------------------------------------------------- */
509 0 : ttxoff = txoff + block1_xsize;
510 0 : ttyoff = tyoff;
511 0 : ttxsize = txsize - block1_xsize;
512 0 : ttysize = tysize;
513 :
514 0 : ablock_x = ttxoff / src_block_width;
515 0 : ablock_y = ttyoff / src_block_height;
516 :
517 0 : axoff = ttxoff - ablock_x * src_block_width;
518 0 : ayoff = ttyoff - ablock_y * src_block_height;
519 :
520 0 : if( axoff + ttxsize > src_block_width )
521 0 : axsize = src_block_width - axoff;
522 : else
523 0 : axsize = ttxsize;
524 :
525 0 : if( ayoff + ttysize > src_block_height )
526 0 : aysize = src_block_height - ayoff;
527 : else
528 0 : aysize = ttysize;
529 :
530 0 : if( axsize > 0 && aysize > 0 )
531 : {
532 0 : MutexHolder oHolder( mutex );
533 : 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 : memcpy( temp_buffer
539 : + (i_line+ayoff) * src_block_width * pixel_size
540 : + axoff * pixel_size,
541 : ((uint8*) buffer) + i_line * block_width * pixel_size
542 : + block1_xsize * pixel_size,
543 0 : axsize * pixel_size );
544 : }
545 :
546 : db->WriteBlock( echannel, ablock_x + ablock_y * src_blocks_per_row,
547 0 : temp_buffer );
548 : }
549 :
550 : /* -------------------------------------------------------------------- */
551 : /* read external block for bottom left corner of target block. */
552 : /* -------------------------------------------------------------------- */
553 0 : ttxoff = txoff;
554 0 : ttyoff = tyoff + block1_ysize;
555 0 : ttxsize = txsize;
556 0 : ttysize = tysize - block1_ysize;
557 :
558 0 : ablock_x = ttxoff / src_block_width;
559 0 : ablock_y = ttyoff / src_block_height;
560 :
561 0 : axoff = ttxoff - ablock_x * src_block_width;
562 0 : ayoff = ttyoff - ablock_y * src_block_height;
563 :
564 0 : if( axoff + ttxsize > src_block_width )
565 0 : axsize = src_block_width - axoff;
566 : else
567 0 : axsize = ttxsize;
568 :
569 0 : if( ayoff + ttysize > src_block_height )
570 0 : aysize = src_block_height - ayoff;
571 : else
572 0 : aysize = ttysize;
573 :
574 0 : if( axsize > 0 && aysize > 0 )
575 : {
576 0 : MutexHolder oHolder( mutex );
577 : db->ReadBlock( echannel, ablock_x + ablock_y * src_blocks_per_row,
578 0 : temp_buffer );
579 :
580 0 : for( i_line = 0; i_line < aysize; i_line++ )
581 : {
582 : memcpy( temp_buffer
583 : + (i_line+ayoff) * src_block_width * pixel_size
584 : + axoff * pixel_size,
585 : ((uint8*) buffer)
586 : + (i_line+block1_ysize) * block_width * pixel_size,
587 0 : axsize * pixel_size );
588 : }
589 :
590 : db->WriteBlock( echannel, ablock_x + ablock_y * src_blocks_per_row,
591 0 : temp_buffer );
592 : }
593 :
594 : /* -------------------------------------------------------------------- */
595 : /* read external block for bottom left corner of target block. */
596 : /* -------------------------------------------------------------------- */
597 0 : ttxoff = txoff + block1_xsize;
598 0 : ttyoff = tyoff + block1_ysize;
599 0 : ttxsize = txsize - block1_xsize;
600 0 : ttysize = tysize - block1_ysize;
601 :
602 0 : ablock_x = ttxoff / src_block_width;
603 0 : ablock_y = ttyoff / src_block_height;
604 :
605 0 : axoff = ttxoff - ablock_x * src_block_width;
606 0 : ayoff = ttyoff - ablock_y * src_block_height;
607 :
608 0 : if( axoff + ttxsize > src_block_width )
609 0 : axsize = src_block_width - axoff;
610 : else
611 0 : axsize = ttxsize;
612 :
613 0 : if( ayoff + ttysize > src_block_height )
614 0 : aysize = src_block_height - ayoff;
615 : else
616 0 : aysize = ttysize;
617 :
618 0 : if( axsize > 0 && aysize > 0 )
619 : {
620 0 : MutexHolder oHolder( mutex );
621 : db->ReadBlock( echannel, ablock_x + ablock_y * src_blocks_per_row,
622 0 : temp_buffer );
623 :
624 0 : for( i_line = 0; i_line < aysize; i_line++ )
625 : {
626 : memcpy( temp_buffer
627 : + (i_line+ayoff) * src_block_width * pixel_size
628 : + axoff * pixel_size,
629 : ((uint8*) buffer)
630 : + (i_line+block1_ysize) * block_width * pixel_size
631 : + block1_xsize * pixel_size,
632 0 : axsize * pixel_size );
633 : }
634 :
635 : db->WriteBlock( echannel, ablock_x + ablock_y * src_blocks_per_row,
636 0 : temp_buffer );
637 : }
638 :
639 0 : free( temp_buffer );
640 :
641 0 : return 1;
642 : }
643 :
644 : /************************************************************************/
645 : /* GetEChanInfo() */
646 : /************************************************************************/
647 0 : void CExternalChannel::GetEChanInfo( std::string &filename, int &echannel,
648 : int &exoff, int &eyoff,
649 : int &exsize, int &eysize ) const
650 :
651 : {
652 0 : echannel = this->echannel;
653 0 : exoff = this->exoff;
654 0 : eyoff = this->eyoff;
655 0 : exsize = this->exsize;
656 0 : eysize = this->eysize;
657 0 : filename = this->filename;
658 0 : }
659 :
660 : /************************************************************************/
661 : /* SetEChanInfo() */
662 : /************************************************************************/
663 :
664 0 : void CExternalChannel::SetEChanInfo( std::string filename, int echannel,
665 : int exoff, int eyoff,
666 : int exsize, int eysize )
667 :
668 : {
669 0 : if( ih_offset == 0 )
670 0 : ThrowPCIDSKException( "No Image Header available for this channel." );
671 :
672 : /* -------------------------------------------------------------------- */
673 : /* Fetch the existing image header. */
674 : /* -------------------------------------------------------------------- */
675 0 : PCIDSKBuffer ih(1024);
676 :
677 0 : file->ReadFromFile( ih.buffer, ih_offset, 1024 );
678 :
679 : /* -------------------------------------------------------------------- */
680 : /* If the linked filename is too long to fit in the 64 */
681 : /* character IHi.2 field, then we need to use a link segment to */
682 : /* store the filename. */
683 : /* -------------------------------------------------------------------- */
684 0 : std::string IHi2_filename;
685 :
686 0 : if( filename.size() > 64 )
687 : {
688 : int link_segment;
689 :
690 0 : ih.Get( 64, 64, IHi2_filename );
691 :
692 0 : if( IHi2_filename.substr(0,3) == "LNK" )
693 : {
694 0 : link_segment = std::atoi( IHi2_filename.c_str() + 4 );
695 : }
696 : else
697 : {
698 : char link_filename[64];
699 :
700 : link_segment =
701 : file->CreateSegment( "Link ",
702 : "Long external channel filename link.",
703 0 : SEG_SYS, 1 );
704 :
705 0 : sprintf( link_filename, "LNK %4d", link_segment );
706 0 : IHi2_filename = link_filename;
707 : }
708 :
709 : CLinkSegment *link =
710 0 : dynamic_cast<CLinkSegment*>( file->GetSegment( link_segment ) );
711 :
712 0 : if( link != NULL )
713 : {
714 0 : link->SetPath( filename );
715 0 : link->Synchronize();
716 : }
717 : }
718 :
719 : /* -------------------------------------------------------------------- */
720 : /* If we used to have a link segment but no longer need it, we */
721 : /* need to delete the link segment. */
722 : /* -------------------------------------------------------------------- */
723 : else
724 : {
725 0 : ih.Get( 64, 64, IHi2_filename );
726 :
727 0 : if( IHi2_filename.substr(0,3) == "LNK" )
728 : {
729 0 : int link_segment = std::atoi( IHi2_filename.c_str() + 4 );
730 :
731 0 : file->DeleteSegment( link_segment );
732 : }
733 :
734 0 : IHi2_filename = filename;
735 : }
736 :
737 : /* -------------------------------------------------------------------- */
738 : /* Update the image header. */
739 : /* -------------------------------------------------------------------- */
740 : // IHi.2
741 0 : ih.Put( IHi2_filename.c_str(), 64, 64 );
742 :
743 : // IHi.6.1
744 0 : ih.Put( "", 168, 16 );
745 :
746 : // IHi.6.2
747 0 : ih.Put( "", 184, 8 );
748 :
749 : // IHi.6.3
750 0 : ih.Put( "", 192, 8 );
751 :
752 : // IHi.6.5
753 0 : ih.Put( "", 201, 1 );
754 :
755 : // IHi.6.7
756 0 : ih.Put( exoff, 250, 8 );
757 :
758 : // IHi.6.8
759 0 : ih.Put( eyoff, 258, 8 );
760 :
761 : // IHi.6.9
762 0 : ih.Put( exsize, 266, 8 );
763 :
764 : // IHi.6.10
765 0 : ih.Put( eysize, 274, 8 );
766 :
767 : // IHi.6.11
768 0 : ih.Put( echannel, 282, 8 );
769 :
770 0 : file->WriteToFile( ih.buffer, ih_offset, 1024 );
771 :
772 : /* -------------------------------------------------------------------- */
773 : /* Update local configuration. */
774 : /* -------------------------------------------------------------------- */
775 0 : this->filename = MergeRelativePath( file->GetInterfaces()->io,
776 : file->GetFilename(),
777 0 : filename );
778 :
779 0 : this->exoff = exoff;
780 0 : this->eyoff = eyoff;
781 0 : this->exsize = exsize;
782 0 : this->eysize = eysize;
783 0 : this->echannel = echannel;
784 0 : }
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