1 | /* |
---|
2 | * Copyright 1996, University Corporation for Atmospheric Research |
---|
3 | * See netcdf/COPYRIGHT file for copying and redistribution conditions. |
---|
4 | */ |
---|
5 | /* $Id: v1hpg.c,v 1.70 2010/05/26 21:43:34 dmh Exp $ */ |
---|
6 | |
---|
7 | #include "config.h" |
---|
8 | #include "nc.h" |
---|
9 | #include <stdlib.h> |
---|
10 | #include <stdio.h> |
---|
11 | #include <string.h> |
---|
12 | #include <assert.h> |
---|
13 | #include "rnd.h" |
---|
14 | #include "ncx.h" |
---|
15 | |
---|
16 | /* |
---|
17 | * This module defines the external representation |
---|
18 | * of the "header" of a netcdf version one file and |
---|
19 | * the version two variant that uses 64-bit file |
---|
20 | * offsets instead of the 32-bit file offsets in version |
---|
21 | * one files. |
---|
22 | * For each of the components of the NC structure, |
---|
23 | * There are (static) ncx_len_XXX(), v1h_put_XXX() |
---|
24 | * and v1h_get_XXX() functions. These define the |
---|
25 | * external representation of the components. |
---|
26 | * The exported entry points for the whole NC structure |
---|
27 | * are built up from these. |
---|
28 | */ |
---|
29 | |
---|
30 | |
---|
31 | /* |
---|
32 | * "magic number" at beginning of file: 0x43444601 (big endian) |
---|
33 | * assert(sizeof(ncmagic) % X_ALIGN == 0); |
---|
34 | */ |
---|
35 | static const schar ncmagic[] = {'C', 'D', 'F', 0x02}; |
---|
36 | static const schar ncmagic1[] = {'C', 'D', 'F', 0x01}; |
---|
37 | |
---|
38 | |
---|
39 | /* |
---|
40 | * v1hs == "Version 1 Header Stream" |
---|
41 | * |
---|
42 | * The netcdf file version 1 header is |
---|
43 | * of unknown and potentially unlimited size. |
---|
44 | * So, we don't know how much to get() on |
---|
45 | * the initial read. We build a stream, 'v1hs' |
---|
46 | * on top of ncio to do the header get. |
---|
47 | */ |
---|
48 | typedef struct v1hs { |
---|
49 | ncio *nciop; |
---|
50 | off_t offset; /* argument to nciop->get() */ |
---|
51 | size_t extent; /* argument to nciop->get() */ |
---|
52 | int flags; /* set to RGN_WRITE for write */ |
---|
53 | int version; /* format variant: NC_FORMAT_CLASSIC or NC_FORMAT_64BIT */ |
---|
54 | void *base; /* beginning of current buffer */ |
---|
55 | void *pos; /* current position in buffer */ |
---|
56 | void *end; /* end of current buffer = base + extent */ |
---|
57 | } v1hs; |
---|
58 | |
---|
59 | |
---|
60 | /* |
---|
61 | * Release the stream, invalidate buffer |
---|
62 | */ |
---|
63 | static int |
---|
64 | rel_v1hs(v1hs *gsp) |
---|
65 | { |
---|
66 | int status; |
---|
67 | if(gsp->offset == OFF_NONE || gsp->base == NULL) |
---|
68 | return ENOERR; |
---|
69 | status = ncio_rel(gsp->nciop, gsp->offset, |
---|
70 | gsp->flags == RGN_WRITE ? RGN_MODIFIED : 0); |
---|
71 | gsp->end = NULL; |
---|
72 | gsp->pos = NULL; |
---|
73 | gsp->base = NULL; |
---|
74 | return status; |
---|
75 | } |
---|
76 | |
---|
77 | |
---|
78 | /* |
---|
79 | * Release the current chunk and get the next one. |
---|
80 | * Also used for initialization when gsp->base == NULL. |
---|
81 | */ |
---|
82 | static int |
---|
83 | fault_v1hs(v1hs *gsp, size_t extent) |
---|
84 | { |
---|
85 | int status; |
---|
86 | |
---|
87 | if(gsp->base != NULL) |
---|
88 | { |
---|
89 | const ptrdiff_t incr = (char *)gsp->pos - (char *)gsp->base; |
---|
90 | status = rel_v1hs(gsp); |
---|
91 | if(status) |
---|
92 | return status; |
---|
93 | gsp->offset += incr; |
---|
94 | } |
---|
95 | |
---|
96 | if(extent > gsp->extent) |
---|
97 | gsp->extent = extent; |
---|
98 | |
---|
99 | status = ncio_get(gsp->nciop, |
---|
100 | gsp->offset, gsp->extent, |
---|
101 | gsp->flags, &gsp->base); |
---|
102 | if(status) |
---|
103 | return status; |
---|
104 | |
---|
105 | gsp->pos = gsp->base; |
---|
106 | gsp->end = (char *)gsp->base + gsp->extent; |
---|
107 | |
---|
108 | return ENOERR; |
---|
109 | } |
---|
110 | |
---|
111 | |
---|
112 | /* |
---|
113 | * Ensure that 'nextread' bytes are available. |
---|
114 | */ |
---|
115 | static int |
---|
116 | check_v1hs(v1hs *gsp, size_t nextread) |
---|
117 | { |
---|
118 | |
---|
119 | #if 0 /* DEBUG */ |
---|
120 | fprintf(stderr, "nextread %lu, remaining %lu\n", |
---|
121 | (unsigned long)nextread, |
---|
122 | (unsigned long)((char *)gsp->end - (char *)gsp->pos)); |
---|
123 | #endif |
---|
124 | |
---|
125 | if((char *)gsp->pos + nextread <= (char *)gsp->end) |
---|
126 | return ENOERR; |
---|
127 | return fault_v1hs(gsp, nextread); |
---|
128 | } |
---|
129 | |
---|
130 | /* End v1hs */ |
---|
131 | |
---|
132 | /* Write a size_t to the header */ |
---|
133 | static int |
---|
134 | v1h_put_size_t(v1hs *psp, const size_t *sp) |
---|
135 | { |
---|
136 | int status = check_v1hs(psp, X_SIZEOF_SIZE_T); |
---|
137 | if(status != ENOERR) |
---|
138 | return status; |
---|
139 | return ncx_put_size_t(&psp->pos, sp); |
---|
140 | } |
---|
141 | |
---|
142 | |
---|
143 | /* Read a size_t from the header */ |
---|
144 | static int |
---|
145 | v1h_get_size_t(v1hs *gsp, size_t *sp) |
---|
146 | { |
---|
147 | int status = check_v1hs(gsp, X_SIZEOF_SIZE_T); |
---|
148 | if(status != ENOERR) |
---|
149 | return status; |
---|
150 | return ncx_get_size_t((const void **)(&gsp->pos), sp); |
---|
151 | } |
---|
152 | |
---|
153 | |
---|
154 | /* Begin nc_type */ |
---|
155 | |
---|
156 | #define X_SIZEOF_NC_TYPE X_SIZEOF_INT |
---|
157 | |
---|
158 | /* Write a nc_type to the header */ |
---|
159 | static int |
---|
160 | v1h_put_nc_type(v1hs *psp, const nc_type *typep) |
---|
161 | { |
---|
162 | const int itype = (int) *typep; |
---|
163 | int status = check_v1hs(psp, X_SIZEOF_INT); |
---|
164 | if(status != ENOERR) |
---|
165 | return status; |
---|
166 | status = ncx_put_int_int(psp->pos, &itype); |
---|
167 | psp->pos = (void *)((char *)psp->pos + X_SIZEOF_INT); |
---|
168 | return status; |
---|
169 | } |
---|
170 | |
---|
171 | |
---|
172 | /* Read a nc_type from the header */ |
---|
173 | static int |
---|
174 | v1h_get_nc_type(v1hs *gsp, nc_type *typep) |
---|
175 | { |
---|
176 | int type = 0; |
---|
177 | int status = check_v1hs(gsp, X_SIZEOF_INT); |
---|
178 | if(status != ENOERR) |
---|
179 | return status; |
---|
180 | status = ncx_get_int_int(gsp->pos, &type); |
---|
181 | gsp->pos = (void *)((char *)gsp->pos + X_SIZEOF_INT); |
---|
182 | if(status != ENOERR) |
---|
183 | return status; |
---|
184 | |
---|
185 | assert(type == NC_BYTE |
---|
186 | || type == NC_CHAR |
---|
187 | || type == NC_SHORT |
---|
188 | || type == NC_INT |
---|
189 | || type == NC_FLOAT |
---|
190 | || type == NC_DOUBLE); |
---|
191 | |
---|
192 | /* else */ |
---|
193 | *typep = (nc_type) type; |
---|
194 | |
---|
195 | return ENOERR; |
---|
196 | } |
---|
197 | |
---|
198 | /* End nc_type */ |
---|
199 | /* Begin NCtype (internal tags) */ |
---|
200 | |
---|
201 | #define X_SIZEOF_NCTYPE X_SIZEOF_INT |
---|
202 | |
---|
203 | /* Write a NCtype to the header */ |
---|
204 | static int |
---|
205 | v1h_put_NCtype(v1hs *psp, NCtype type) |
---|
206 | { |
---|
207 | const int itype = (int) type; |
---|
208 | int status = check_v1hs(psp, X_SIZEOF_INT); |
---|
209 | if(status != ENOERR) |
---|
210 | return status; |
---|
211 | status = ncx_put_int_int(psp->pos, &itype); |
---|
212 | psp->pos = (void *)((char *)psp->pos + X_SIZEOF_INT); |
---|
213 | return status; |
---|
214 | } |
---|
215 | |
---|
216 | /* Read a NCtype from the header */ |
---|
217 | static int |
---|
218 | v1h_get_NCtype(v1hs *gsp, NCtype *typep) |
---|
219 | { |
---|
220 | int type = 0; |
---|
221 | int status = check_v1hs(gsp, X_SIZEOF_INT); |
---|
222 | if(status != ENOERR) |
---|
223 | return status; |
---|
224 | status = ncx_get_int_int(gsp->pos, &type); |
---|
225 | gsp->pos = (void *)((char *)gsp->pos + X_SIZEOF_INT); |
---|
226 | if(status != ENOERR) |
---|
227 | return status; |
---|
228 | /* else */ |
---|
229 | *typep = (NCtype) type; |
---|
230 | return ENOERR; |
---|
231 | } |
---|
232 | |
---|
233 | /* End NCtype */ |
---|
234 | /* Begin NC_string */ |
---|
235 | |
---|
236 | /* |
---|
237 | * How much space will the xdr'd string take. |
---|
238 | * Formerly |
---|
239 | NC_xlen_string(cdfstr) |
---|
240 | */ |
---|
241 | static size_t |
---|
242 | ncx_len_NC_string(const NC_string *ncstrp) |
---|
243 | { |
---|
244 | size_t sz = X_SIZEOF_SIZE_T; /* nchars */ |
---|
245 | |
---|
246 | assert(ncstrp != NULL); |
---|
247 | |
---|
248 | if(ncstrp->nchars != 0) |
---|
249 | { |
---|
250 | #if 0 |
---|
251 | assert(ncstrp->nchars % X_ALIGN == 0); |
---|
252 | sz += ncstrp->nchars; |
---|
253 | #else |
---|
254 | sz += _RNDUP(ncstrp->nchars, X_ALIGN); |
---|
255 | #endif |
---|
256 | } |
---|
257 | return sz; |
---|
258 | } |
---|
259 | |
---|
260 | |
---|
261 | /* Write a NC_string to the header */ |
---|
262 | static int |
---|
263 | v1h_put_NC_string(v1hs *psp, const NC_string *ncstrp) |
---|
264 | { |
---|
265 | int status; |
---|
266 | |
---|
267 | #if 0 |
---|
268 | assert(ncstrp->nchars % X_ALIGN == 0); |
---|
269 | #endif |
---|
270 | |
---|
271 | status = v1h_put_size_t(psp, &ncstrp->nchars); |
---|
272 | if(status != ENOERR) |
---|
273 | return status; |
---|
274 | status = check_v1hs(psp, _RNDUP(ncstrp->nchars, X_ALIGN)); |
---|
275 | if(status != ENOERR) |
---|
276 | return status; |
---|
277 | status = ncx_pad_putn_text(&psp->pos, ncstrp->nchars, ncstrp->cp); |
---|
278 | if(status != ENOERR) |
---|
279 | return status; |
---|
280 | |
---|
281 | return ENOERR; |
---|
282 | } |
---|
283 | |
---|
284 | |
---|
285 | /* Read a NC_string from the header */ |
---|
286 | static int |
---|
287 | v1h_get_NC_string(v1hs *gsp, NC_string **ncstrpp) |
---|
288 | { |
---|
289 | int status; |
---|
290 | size_t nchars = 0; |
---|
291 | NC_string *ncstrp; |
---|
292 | |
---|
293 | status = v1h_get_size_t(gsp, &nchars); |
---|
294 | if(status != ENOERR) |
---|
295 | return status; |
---|
296 | |
---|
297 | ncstrp = new_NC_string(nchars, NULL); |
---|
298 | if(ncstrp == NULL) |
---|
299 | { |
---|
300 | return NC_ENOMEM; |
---|
301 | } |
---|
302 | |
---|
303 | |
---|
304 | #if 0 |
---|
305 | /* assert(ncstrp->nchars == nchars || ncstrp->nchars - nchars < X_ALIGN); */ |
---|
306 | assert(ncstrp->nchars % X_ALIGN == 0); |
---|
307 | status = check_v1hs(gsp, ncstrp->nchars); |
---|
308 | #else |
---|
309 | |
---|
310 | status = check_v1hs(gsp, _RNDUP(ncstrp->nchars, X_ALIGN)); |
---|
311 | #endif |
---|
312 | if(status != ENOERR) |
---|
313 | goto unwind_alloc; |
---|
314 | |
---|
315 | status = ncx_pad_getn_text((const void **)(&gsp->pos), |
---|
316 | nchars, ncstrp->cp); |
---|
317 | if(status != ENOERR) |
---|
318 | goto unwind_alloc; |
---|
319 | |
---|
320 | *ncstrpp = ncstrp; |
---|
321 | |
---|
322 | return ENOERR; |
---|
323 | |
---|
324 | unwind_alloc: |
---|
325 | free_NC_string(ncstrp); |
---|
326 | return status; |
---|
327 | |
---|
328 | } |
---|
329 | |
---|
330 | /* End NC_string */ |
---|
331 | /* Begin NC_dim */ |
---|
332 | |
---|
333 | /* |
---|
334 | * How much space will the xdr'd dim take. |
---|
335 | * Formerly |
---|
336 | NC_xlen_dim(dpp) |
---|
337 | */ |
---|
338 | static size_t |
---|
339 | ncx_len_NC_dim(const NC_dim *dimp) |
---|
340 | { |
---|
341 | size_t sz; |
---|
342 | |
---|
343 | assert(dimp != NULL); |
---|
344 | |
---|
345 | sz = ncx_len_NC_string(dimp->name); |
---|
346 | sz += X_SIZEOF_SIZE_T; |
---|
347 | |
---|
348 | return(sz); |
---|
349 | } |
---|
350 | |
---|
351 | |
---|
352 | /* Write a NC_dim to the header */ |
---|
353 | static int |
---|
354 | v1h_put_NC_dim(v1hs *psp, const NC_dim *dimp) |
---|
355 | { |
---|
356 | int status; |
---|
357 | |
---|
358 | status = v1h_put_NC_string(psp, dimp->name); |
---|
359 | if(status != ENOERR) |
---|
360 | return status; |
---|
361 | |
---|
362 | status = v1h_put_size_t(psp, &dimp->size); |
---|
363 | if(status != ENOERR) |
---|
364 | return status; |
---|
365 | |
---|
366 | return ENOERR; |
---|
367 | } |
---|
368 | |
---|
369 | /* Read a NC_dim from the header */ |
---|
370 | static int |
---|
371 | v1h_get_NC_dim(v1hs *gsp, NC_dim **dimpp) |
---|
372 | { |
---|
373 | int status; |
---|
374 | NC_string *ncstrp; |
---|
375 | NC_dim *dimp; |
---|
376 | |
---|
377 | status = v1h_get_NC_string(gsp, &ncstrp); |
---|
378 | if(status != ENOERR) |
---|
379 | return status; |
---|
380 | |
---|
381 | dimp = new_x_NC_dim(ncstrp); |
---|
382 | if(dimp == NULL) |
---|
383 | { |
---|
384 | status = NC_ENOMEM; |
---|
385 | goto unwind_name; |
---|
386 | } |
---|
387 | |
---|
388 | status = v1h_get_size_t(gsp, &dimp->size); |
---|
389 | if(status != ENOERR) |
---|
390 | { |
---|
391 | free_NC_dim(dimp); /* frees name */ |
---|
392 | return status; |
---|
393 | } |
---|
394 | |
---|
395 | *dimpp = dimp; |
---|
396 | |
---|
397 | return ENOERR; |
---|
398 | |
---|
399 | unwind_name: |
---|
400 | free_NC_string(ncstrp); |
---|
401 | return status; |
---|
402 | } |
---|
403 | |
---|
404 | |
---|
405 | /* How much space in the header is required for this NC_dimarray? */ |
---|
406 | static size_t |
---|
407 | ncx_len_NC_dimarray(const NC_dimarray *ncap) |
---|
408 | { |
---|
409 | size_t xlen = X_SIZEOF_NCTYPE; /* type */ |
---|
410 | xlen += X_SIZEOF_SIZE_T; /* count */ |
---|
411 | if(ncap == NULL) |
---|
412 | return xlen; |
---|
413 | /* else */ |
---|
414 | { |
---|
415 | const NC_dim **dpp = (const NC_dim **)ncap->value; |
---|
416 | const NC_dim *const *const end = &dpp[ncap->nelems]; |
---|
417 | for( /*NADA*/; dpp < end; dpp++) |
---|
418 | { |
---|
419 | xlen += ncx_len_NC_dim(*dpp); |
---|
420 | } |
---|
421 | } |
---|
422 | return xlen; |
---|
423 | } |
---|
424 | |
---|
425 | |
---|
426 | /* Write a NC_dimarray to the header */ |
---|
427 | static int |
---|
428 | v1h_put_NC_dimarray(v1hs *psp, const NC_dimarray *ncap) |
---|
429 | { |
---|
430 | int status; |
---|
431 | |
---|
432 | assert(psp != NULL); |
---|
433 | |
---|
434 | if(ncap == NULL |
---|
435 | #if 1 |
---|
436 | /* Backward: |
---|
437 | * This clause is for 'byte for byte' |
---|
438 | * backward compatibility. |
---|
439 | * Strickly speaking, it is 'bug for bug'. |
---|
440 | */ |
---|
441 | || ncap->nelems == 0 |
---|
442 | #endif |
---|
443 | ) |
---|
444 | { |
---|
445 | /* |
---|
446 | * Handle empty netcdf |
---|
447 | */ |
---|
448 | const size_t nosz = 0; |
---|
449 | |
---|
450 | status = v1h_put_NCtype(psp, NC_UNSPECIFIED); |
---|
451 | if(status != ENOERR) |
---|
452 | return status; |
---|
453 | status = v1h_put_size_t(psp, &nosz); |
---|
454 | if(status != ENOERR) |
---|
455 | return status; |
---|
456 | return ENOERR; |
---|
457 | } |
---|
458 | /* else */ |
---|
459 | |
---|
460 | status = v1h_put_NCtype(psp, NC_DIMENSION); |
---|
461 | if(status != ENOERR) |
---|
462 | return status; |
---|
463 | status = v1h_put_size_t(psp, &ncap->nelems); |
---|
464 | if(status != ENOERR) |
---|
465 | return status; |
---|
466 | |
---|
467 | { |
---|
468 | const NC_dim **dpp = (const NC_dim **)ncap->value; |
---|
469 | const NC_dim *const *const end = &dpp[ncap->nelems]; |
---|
470 | for( /*NADA*/; dpp < end; dpp++) |
---|
471 | { |
---|
472 | status = v1h_put_NC_dim(psp, *dpp); |
---|
473 | if(status) |
---|
474 | return status; |
---|
475 | } |
---|
476 | } |
---|
477 | return ENOERR; |
---|
478 | } |
---|
479 | |
---|
480 | |
---|
481 | /* Read a NC_dimarray from the header */ |
---|
482 | static int |
---|
483 | v1h_get_NC_dimarray(v1hs *gsp, NC_dimarray *ncap) |
---|
484 | { |
---|
485 | int status; |
---|
486 | NCtype type = NC_UNSPECIFIED; |
---|
487 | |
---|
488 | assert(gsp != NULL && gsp->pos != NULL); |
---|
489 | assert(ncap != NULL); |
---|
490 | assert(ncap->value == NULL); |
---|
491 | |
---|
492 | status = v1h_get_NCtype(gsp, &type); |
---|
493 | if(status != ENOERR) |
---|
494 | return status; |
---|
495 | |
---|
496 | status = v1h_get_size_t(gsp, &ncap->nelems); |
---|
497 | if(status != ENOERR) |
---|
498 | return status; |
---|
499 | |
---|
500 | if(ncap->nelems == 0) |
---|
501 | return ENOERR; |
---|
502 | /* else */ |
---|
503 | if(type != NC_DIMENSION) |
---|
504 | return EINVAL; |
---|
505 | |
---|
506 | ncap->value = (NC_dim **) malloc(ncap->nelems * sizeof(NC_dim *)); |
---|
507 | if(ncap->value == NULL) |
---|
508 | return NC_ENOMEM; |
---|
509 | ncap->nalloc = ncap->nelems; |
---|
510 | |
---|
511 | { |
---|
512 | NC_dim **dpp = ncap->value; |
---|
513 | NC_dim *const *const end = &dpp[ncap->nelems]; |
---|
514 | for( /*NADA*/; dpp < end; dpp++) |
---|
515 | { |
---|
516 | status = v1h_get_NC_dim(gsp, dpp); |
---|
517 | if(status) |
---|
518 | { |
---|
519 | ncap->nelems = (size_t)(dpp - ncap->value); |
---|
520 | free_NC_dimarrayV(ncap); |
---|
521 | return status; |
---|
522 | } |
---|
523 | } |
---|
524 | } |
---|
525 | |
---|
526 | return ENOERR; |
---|
527 | } |
---|
528 | |
---|
529 | |
---|
530 | /* End NC_dim */ |
---|
531 | /* Begin NC_attr */ |
---|
532 | |
---|
533 | |
---|
534 | /* |
---|
535 | * How much space will 'attrp' take in external representation? |
---|
536 | * Formerly |
---|
537 | NC_xlen_attr(app) |
---|
538 | */ |
---|
539 | static size_t |
---|
540 | ncx_len_NC_attr(const NC_attr *attrp) |
---|
541 | { |
---|
542 | size_t sz; |
---|
543 | |
---|
544 | assert(attrp != NULL); |
---|
545 | |
---|
546 | sz = ncx_len_NC_string(attrp->name); |
---|
547 | sz += X_SIZEOF_NC_TYPE; /* type */ |
---|
548 | sz += X_SIZEOF_SIZE_T; /* nelems */ |
---|
549 | sz += attrp->xsz; |
---|
550 | |
---|
551 | return(sz); |
---|
552 | } |
---|
553 | |
---|
554 | |
---|
555 | #undef MIN |
---|
556 | #define MIN(mm,nn) (((mm) < (nn)) ? (mm) : (nn)) |
---|
557 | |
---|
558 | /* |
---|
559 | * Put the values of an attribute |
---|
560 | * The loop is necessary since attrp->nelems |
---|
561 | * could potentially be quite large. |
---|
562 | */ |
---|
563 | static int |
---|
564 | v1h_put_NC_attrV(v1hs *psp, const NC_attr *attrp) |
---|
565 | { |
---|
566 | int status; |
---|
567 | const size_t perchunk = psp->extent; |
---|
568 | size_t remaining = attrp->xsz; |
---|
569 | void *value = attrp->xvalue; |
---|
570 | size_t nbytes; |
---|
571 | |
---|
572 | assert(psp->extent % X_ALIGN == 0); |
---|
573 | |
---|
574 | do { |
---|
575 | nbytes = MIN(perchunk, remaining); |
---|
576 | |
---|
577 | status = check_v1hs(psp, nbytes); |
---|
578 | if(status != ENOERR) |
---|
579 | return status; |
---|
580 | |
---|
581 | (void) memcpy(psp->pos, value, nbytes); |
---|
582 | |
---|
583 | psp->pos = (void *)((char *)psp->pos + nbytes); |
---|
584 | value = (void *)((char *)value + nbytes); |
---|
585 | remaining -= nbytes; |
---|
586 | |
---|
587 | } while(remaining != 0); |
---|
588 | |
---|
589 | return ENOERR; |
---|
590 | } |
---|
591 | |
---|
592 | /* Write a NC_attr to the header */ |
---|
593 | static int |
---|
594 | v1h_put_NC_attr(v1hs *psp, const NC_attr *attrp) |
---|
595 | { |
---|
596 | int status; |
---|
597 | |
---|
598 | status = v1h_put_NC_string(psp, attrp->name); |
---|
599 | if(status != ENOERR) |
---|
600 | return status; |
---|
601 | |
---|
602 | status = v1h_put_nc_type(psp, &attrp->type); |
---|
603 | if(status != ENOERR) |
---|
604 | return status; |
---|
605 | |
---|
606 | status = v1h_put_size_t(psp, &attrp->nelems); |
---|
607 | if(status != ENOERR) |
---|
608 | return status; |
---|
609 | |
---|
610 | status = v1h_put_NC_attrV(psp, attrp); |
---|
611 | if(status != ENOERR) |
---|
612 | return status; |
---|
613 | |
---|
614 | return ENOERR; |
---|
615 | } |
---|
616 | |
---|
617 | |
---|
618 | /* |
---|
619 | * Get the values of an attribute |
---|
620 | * The loop is necessary since attrp->nelems |
---|
621 | * could potentially be quite large. |
---|
622 | */ |
---|
623 | static int |
---|
624 | v1h_get_NC_attrV(v1hs *gsp, NC_attr *attrp) |
---|
625 | { |
---|
626 | int status; |
---|
627 | const size_t perchunk = gsp->extent; |
---|
628 | size_t remaining = attrp->xsz; |
---|
629 | void *value = attrp->xvalue; |
---|
630 | size_t nget; |
---|
631 | |
---|
632 | do { |
---|
633 | nget = MIN(perchunk, remaining); |
---|
634 | |
---|
635 | status = check_v1hs(gsp, nget); |
---|
636 | if(status != ENOERR) |
---|
637 | return status; |
---|
638 | |
---|
639 | (void) memcpy(value, gsp->pos, nget); |
---|
640 | |
---|
641 | gsp->pos = (void *)((char *)gsp->pos + nget); |
---|
642 | value = (void *)((char *)value + nget); |
---|
643 | remaining -= nget; |
---|
644 | |
---|
645 | } while(remaining != 0); |
---|
646 | |
---|
647 | return ENOERR; |
---|
648 | } |
---|
649 | |
---|
650 | |
---|
651 | /* Read a NC_attr from the header */ |
---|
652 | static int |
---|
653 | v1h_get_NC_attr(v1hs *gsp, NC_attr **attrpp) |
---|
654 | { |
---|
655 | NC_string *strp; |
---|
656 | int status; |
---|
657 | nc_type type; |
---|
658 | size_t nelems; |
---|
659 | NC_attr *attrp; |
---|
660 | |
---|
661 | status = v1h_get_NC_string(gsp, &strp); |
---|
662 | if(status != ENOERR) |
---|
663 | return status; |
---|
664 | |
---|
665 | status = v1h_get_nc_type(gsp, &type); |
---|
666 | if(status != ENOERR) |
---|
667 | goto unwind_name; |
---|
668 | |
---|
669 | status = v1h_get_size_t(gsp, &nelems); |
---|
670 | if(status != ENOERR) |
---|
671 | goto unwind_name; |
---|
672 | |
---|
673 | attrp = new_x_NC_attr(strp, type, nelems); |
---|
674 | if(attrp == NULL) |
---|
675 | { |
---|
676 | status = NC_ENOMEM; |
---|
677 | goto unwind_name; |
---|
678 | } |
---|
679 | |
---|
680 | status = v1h_get_NC_attrV(gsp, attrp); |
---|
681 | if(status != ENOERR) |
---|
682 | { |
---|
683 | free_NC_attr(attrp); /* frees strp */ |
---|
684 | return status; |
---|
685 | } |
---|
686 | |
---|
687 | *attrpp = attrp; |
---|
688 | |
---|
689 | return ENOERR; |
---|
690 | |
---|
691 | unwind_name: |
---|
692 | free_NC_string(strp); |
---|
693 | return status; |
---|
694 | } |
---|
695 | |
---|
696 | |
---|
697 | /* How much space in the header is required for this NC_attrarray? */ |
---|
698 | static size_t |
---|
699 | ncx_len_NC_attrarray(const NC_attrarray *ncap) |
---|
700 | { |
---|
701 | size_t xlen = X_SIZEOF_NCTYPE; /* type */ |
---|
702 | xlen += X_SIZEOF_SIZE_T; /* count */ |
---|
703 | if(ncap == NULL) |
---|
704 | return xlen; |
---|
705 | /* else */ |
---|
706 | { |
---|
707 | const NC_attr **app = (const NC_attr **)ncap->value; |
---|
708 | const NC_attr *const *const end = &app[ncap->nelems]; |
---|
709 | for( /*NADA*/; app < end; app++) |
---|
710 | { |
---|
711 | xlen += ncx_len_NC_attr(*app); |
---|
712 | } |
---|
713 | } |
---|
714 | return xlen; |
---|
715 | } |
---|
716 | |
---|
717 | |
---|
718 | /* Write a NC_attrarray to the header */ |
---|
719 | static int |
---|
720 | v1h_put_NC_attrarray(v1hs *psp, const NC_attrarray *ncap) |
---|
721 | { |
---|
722 | int status; |
---|
723 | |
---|
724 | assert(psp != NULL); |
---|
725 | |
---|
726 | if(ncap == NULL |
---|
727 | #if 1 |
---|
728 | /* Backward: |
---|
729 | * This clause is for 'byte for byte' |
---|
730 | * backward compatibility. |
---|
731 | * Strickly speaking, it is 'bug for bug'. |
---|
732 | */ |
---|
733 | || ncap->nelems == 0 |
---|
734 | #endif |
---|
735 | ) |
---|
736 | { |
---|
737 | /* |
---|
738 | * Handle empty netcdf |
---|
739 | */ |
---|
740 | const size_t nosz = 0; |
---|
741 | |
---|
742 | status = v1h_put_NCtype(psp, NC_UNSPECIFIED); |
---|
743 | if(status != ENOERR) |
---|
744 | return status; |
---|
745 | status = v1h_put_size_t(psp, &nosz); |
---|
746 | if(status != ENOERR) |
---|
747 | return status; |
---|
748 | return ENOERR; |
---|
749 | } |
---|
750 | /* else */ |
---|
751 | |
---|
752 | status = v1h_put_NCtype(psp, NC_ATTRIBUTE); |
---|
753 | if(status != ENOERR) |
---|
754 | return status; |
---|
755 | status = v1h_put_size_t(psp, &ncap->nelems); |
---|
756 | if(status != ENOERR) |
---|
757 | return status; |
---|
758 | |
---|
759 | { |
---|
760 | const NC_attr **app = (const NC_attr **)ncap->value; |
---|
761 | const NC_attr *const *const end = &app[ncap->nelems]; |
---|
762 | for( /*NADA*/; app < end; app++) |
---|
763 | { |
---|
764 | status = v1h_put_NC_attr(psp, *app); |
---|
765 | if(status) |
---|
766 | return status; |
---|
767 | } |
---|
768 | } |
---|
769 | return ENOERR; |
---|
770 | } |
---|
771 | |
---|
772 | |
---|
773 | /* Read a NC_attrarray from the header */ |
---|
774 | static int |
---|
775 | v1h_get_NC_attrarray(v1hs *gsp, NC_attrarray *ncap) |
---|
776 | { |
---|
777 | int status; |
---|
778 | NCtype type = NC_UNSPECIFIED; |
---|
779 | |
---|
780 | assert(gsp != NULL && gsp->pos != NULL); |
---|
781 | assert(ncap != NULL); |
---|
782 | assert(ncap->value == NULL); |
---|
783 | |
---|
784 | status = v1h_get_NCtype(gsp, &type); |
---|
785 | if(status != ENOERR) |
---|
786 | return status; |
---|
787 | status = v1h_get_size_t(gsp, &ncap->nelems); |
---|
788 | if(status != ENOERR) |
---|
789 | return status; |
---|
790 | |
---|
791 | if(ncap->nelems == 0) |
---|
792 | return ENOERR; |
---|
793 | /* else */ |
---|
794 | if(type != NC_ATTRIBUTE) |
---|
795 | return EINVAL; |
---|
796 | |
---|
797 | ncap->value = (NC_attr **) malloc(ncap->nelems * sizeof(NC_attr *)); |
---|
798 | if(ncap->value == NULL) |
---|
799 | return NC_ENOMEM; |
---|
800 | ncap->nalloc = ncap->nelems; |
---|
801 | |
---|
802 | { |
---|
803 | NC_attr **app = ncap->value; |
---|
804 | NC_attr *const *const end = &app[ncap->nelems]; |
---|
805 | for( /*NADA*/; app < end; app++) |
---|
806 | { |
---|
807 | status = v1h_get_NC_attr(gsp, app); |
---|
808 | if(status) |
---|
809 | { |
---|
810 | ncap->nelems = (size_t)(app - ncap->value); |
---|
811 | free_NC_attrarrayV(ncap); |
---|
812 | return status; |
---|
813 | } |
---|
814 | } |
---|
815 | } |
---|
816 | |
---|
817 | return ENOERR; |
---|
818 | } |
---|
819 | |
---|
820 | /* End NC_attr */ |
---|
821 | /* Begin NC_var */ |
---|
822 | |
---|
823 | /* |
---|
824 | * How much space will the xdr'd var take. |
---|
825 | * Formerly |
---|
826 | NC_xlen_var(vpp) |
---|
827 | */ |
---|
828 | static size_t |
---|
829 | ncx_len_NC_var(const NC_var *varp, size_t sizeof_off_t) |
---|
830 | { |
---|
831 | size_t sz; |
---|
832 | |
---|
833 | assert(varp != NULL); |
---|
834 | assert(sizeof_off_t != 0); |
---|
835 | |
---|
836 | sz = ncx_len_NC_string(varp->name); |
---|
837 | sz += X_SIZEOF_SIZE_T; /* ndims */ |
---|
838 | sz += ncx_len_int(varp->ndims); /* dimids */ |
---|
839 | sz += ncx_len_NC_attrarray(&varp->attrs); |
---|
840 | sz += X_SIZEOF_NC_TYPE; /* type */ |
---|
841 | sz += X_SIZEOF_SIZE_T; /* len */ |
---|
842 | sz += sizeof_off_t; /* begin */ |
---|
843 | |
---|
844 | return(sz); |
---|
845 | } |
---|
846 | |
---|
847 | |
---|
848 | /* Write a NC_var to the header */ |
---|
849 | static int |
---|
850 | v1h_put_NC_var(v1hs *psp, const NC_var *varp) |
---|
851 | { |
---|
852 | int status; |
---|
853 | |
---|
854 | status = v1h_put_NC_string(psp, varp->name); |
---|
855 | if(status != ENOERR) |
---|
856 | return status; |
---|
857 | |
---|
858 | status = v1h_put_size_t(psp, &varp->ndims); |
---|
859 | if(status != ENOERR) |
---|
860 | return status; |
---|
861 | |
---|
862 | status = check_v1hs(psp, ncx_len_int(varp->ndims)); |
---|
863 | if(status != ENOERR) |
---|
864 | return status; |
---|
865 | status = ncx_putn_int_int(&psp->pos, |
---|
866 | varp->ndims, varp->dimids); |
---|
867 | if(status != ENOERR) |
---|
868 | return status; |
---|
869 | |
---|
870 | status = v1h_put_NC_attrarray(psp, &varp->attrs); |
---|
871 | if(status != ENOERR) |
---|
872 | return status; |
---|
873 | |
---|
874 | status = v1h_put_nc_type(psp, &varp->type); |
---|
875 | if(status != ENOERR) |
---|
876 | return status; |
---|
877 | |
---|
878 | status = v1h_put_size_t(psp, &varp->len); |
---|
879 | if(status != ENOERR) |
---|
880 | return status; |
---|
881 | |
---|
882 | status = check_v1hs(psp, psp->version == 1 ? 4 : 8); |
---|
883 | if(status != ENOERR) |
---|
884 | return status; |
---|
885 | status = ncx_put_off_t(&psp->pos, &varp->begin, psp->version == 1 ? 4 : 8); |
---|
886 | if(status != ENOERR) |
---|
887 | return status; |
---|
888 | |
---|
889 | return ENOERR; |
---|
890 | } |
---|
891 | |
---|
892 | |
---|
893 | /* Read a NC_var from the header */ |
---|
894 | static int |
---|
895 | v1h_get_NC_var(v1hs *gsp, NC_var **varpp) |
---|
896 | { |
---|
897 | NC_string *strp; |
---|
898 | int status; |
---|
899 | size_t ndims; |
---|
900 | NC_var *varp; |
---|
901 | |
---|
902 | status = v1h_get_NC_string(gsp, &strp); |
---|
903 | if(status != ENOERR) |
---|
904 | return status; |
---|
905 | |
---|
906 | status = v1h_get_size_t(gsp, &ndims); |
---|
907 | if(status != ENOERR) |
---|
908 | goto unwind_name; |
---|
909 | |
---|
910 | varp = new_x_NC_var(strp, ndims); |
---|
911 | if(varp == NULL) |
---|
912 | { |
---|
913 | status = NC_ENOMEM; |
---|
914 | goto unwind_name; |
---|
915 | } |
---|
916 | |
---|
917 | status = check_v1hs(gsp, ncx_len_int(ndims)); |
---|
918 | if(status != ENOERR) |
---|
919 | goto unwind_alloc; |
---|
920 | status = ncx_getn_int_int((const void **)(&gsp->pos), |
---|
921 | ndims, varp->dimids); |
---|
922 | if(status != ENOERR) |
---|
923 | goto unwind_alloc; |
---|
924 | |
---|
925 | status = v1h_get_NC_attrarray(gsp, &varp->attrs); |
---|
926 | if(status != ENOERR) |
---|
927 | goto unwind_alloc; |
---|
928 | |
---|
929 | status = v1h_get_nc_type(gsp, &varp->type); |
---|
930 | if(status != ENOERR) |
---|
931 | goto unwind_alloc; |
---|
932 | |
---|
933 | status = v1h_get_size_t(gsp, &varp->len); |
---|
934 | if(status != ENOERR) |
---|
935 | goto unwind_alloc; |
---|
936 | |
---|
937 | status = check_v1hs(gsp, gsp->version == 1 ? 4 : 8); |
---|
938 | if(status != ENOERR) |
---|
939 | goto unwind_alloc; |
---|
940 | status = ncx_get_off_t((const void **)&gsp->pos, |
---|
941 | &varp->begin, gsp->version == 1 ? 4 : 8); |
---|
942 | if(status != ENOERR) |
---|
943 | goto unwind_alloc; |
---|
944 | |
---|
945 | *varpp = varp; |
---|
946 | return ENOERR; |
---|
947 | |
---|
948 | unwind_alloc: |
---|
949 | free_NC_var(varp); /* frees name */ |
---|
950 | return status; |
---|
951 | |
---|
952 | unwind_name: |
---|
953 | free_NC_string(strp); |
---|
954 | return status; |
---|
955 | } |
---|
956 | |
---|
957 | |
---|
958 | /* How much space in the header is required for this NC_vararray? */ |
---|
959 | static size_t |
---|
960 | ncx_len_NC_vararray(const NC_vararray *ncap, size_t sizeof_off_t) |
---|
961 | { |
---|
962 | size_t xlen = X_SIZEOF_NCTYPE; /* type */ |
---|
963 | xlen += X_SIZEOF_SIZE_T; /* count */ |
---|
964 | if(ncap == NULL) |
---|
965 | return xlen; |
---|
966 | /* else */ |
---|
967 | { |
---|
968 | const NC_var **vpp = (const NC_var **)ncap->value; |
---|
969 | const NC_var *const *const end = &vpp[ncap->nelems]; |
---|
970 | for( /*NADA*/; vpp < end; vpp++) |
---|
971 | { |
---|
972 | xlen += ncx_len_NC_var(*vpp, sizeof_off_t); |
---|
973 | } |
---|
974 | } |
---|
975 | return xlen; |
---|
976 | } |
---|
977 | |
---|
978 | |
---|
979 | /* Write a NC_vararray to the header */ |
---|
980 | static int |
---|
981 | v1h_put_NC_vararray(v1hs *psp, const NC_vararray *ncap) |
---|
982 | { |
---|
983 | int status; |
---|
984 | |
---|
985 | assert(psp != NULL); |
---|
986 | |
---|
987 | if(ncap == NULL |
---|
988 | #if 1 |
---|
989 | /* Backward: |
---|
990 | * This clause is for 'byte for byte' |
---|
991 | * backward compatibility. |
---|
992 | * Strickly speaking, it is 'bug for bug'. |
---|
993 | */ |
---|
994 | || ncap->nelems == 0 |
---|
995 | #endif |
---|
996 | ) |
---|
997 | { |
---|
998 | /* |
---|
999 | * Handle empty netcdf |
---|
1000 | */ |
---|
1001 | const size_t nosz = 0; |
---|
1002 | |
---|
1003 | status = v1h_put_NCtype(psp, NC_UNSPECIFIED); |
---|
1004 | if(status != ENOERR) |
---|
1005 | return status; |
---|
1006 | status = v1h_put_size_t(psp, &nosz); |
---|
1007 | if(status != ENOERR) |
---|
1008 | return status; |
---|
1009 | return ENOERR; |
---|
1010 | } |
---|
1011 | /* else */ |
---|
1012 | |
---|
1013 | status = v1h_put_NCtype(psp, NC_VARIABLE); |
---|
1014 | if(status != ENOERR) |
---|
1015 | return status; |
---|
1016 | status = v1h_put_size_t(psp, &ncap->nelems); |
---|
1017 | if(status != ENOERR) |
---|
1018 | return status; |
---|
1019 | |
---|
1020 | { |
---|
1021 | const NC_var **vpp = (const NC_var **)ncap->value; |
---|
1022 | const NC_var *const *const end = &vpp[ncap->nelems]; |
---|
1023 | for( /*NADA*/; vpp < end; vpp++) |
---|
1024 | { |
---|
1025 | status = v1h_put_NC_var(psp, *vpp); |
---|
1026 | if(status) |
---|
1027 | return status; |
---|
1028 | } |
---|
1029 | } |
---|
1030 | return ENOERR; |
---|
1031 | } |
---|
1032 | |
---|
1033 | |
---|
1034 | /* Read a NC_vararray from the header */ |
---|
1035 | static int |
---|
1036 | v1h_get_NC_vararray(v1hs *gsp, NC_vararray *ncap) |
---|
1037 | { |
---|
1038 | int status; |
---|
1039 | NCtype type = NC_UNSPECIFIED; |
---|
1040 | |
---|
1041 | assert(gsp != NULL && gsp->pos != NULL); |
---|
1042 | assert(ncap != NULL); |
---|
1043 | assert(ncap->value == NULL); |
---|
1044 | |
---|
1045 | status = v1h_get_NCtype(gsp, &type); |
---|
1046 | if(status != ENOERR) |
---|
1047 | return status; |
---|
1048 | |
---|
1049 | status = v1h_get_size_t(gsp, &ncap->nelems); |
---|
1050 | if(status != ENOERR) |
---|
1051 | return status; |
---|
1052 | |
---|
1053 | if(ncap->nelems == 0) |
---|
1054 | return ENOERR; |
---|
1055 | /* else */ |
---|
1056 | if(type != NC_VARIABLE) |
---|
1057 | return EINVAL; |
---|
1058 | |
---|
1059 | ncap->value = (NC_var **) malloc(ncap->nelems * sizeof(NC_var *)); |
---|
1060 | if(ncap->value == NULL) |
---|
1061 | return NC_ENOMEM; |
---|
1062 | ncap->nalloc = ncap->nelems; |
---|
1063 | |
---|
1064 | { |
---|
1065 | NC_var **vpp = ncap->value; |
---|
1066 | NC_var *const *const end = &vpp[ncap->nelems]; |
---|
1067 | for( /*NADA*/; vpp < end; vpp++) |
---|
1068 | { |
---|
1069 | status = v1h_get_NC_var(gsp, vpp); |
---|
1070 | if(status) |
---|
1071 | { |
---|
1072 | ncap->nelems = (size_t)(vpp - ncap->value); |
---|
1073 | free_NC_vararrayV(ncap); |
---|
1074 | return status; |
---|
1075 | } |
---|
1076 | } |
---|
1077 | } |
---|
1078 | |
---|
1079 | return ENOERR; |
---|
1080 | } |
---|
1081 | |
---|
1082 | |
---|
1083 | /* End NC_var */ |
---|
1084 | /* Begin NC */ |
---|
1085 | |
---|
1086 | /* |
---|
1087 | * Recompute the shapes of all variables |
---|
1088 | * Sets ncp->begin_var to start of first variable. |
---|
1089 | * Sets ncp->begin_rec to start of first record variable. |
---|
1090 | * Returns -1 on error. The only possible error is a reference |
---|
1091 | * to a non existent dimension, which could occur for a corrupted |
---|
1092 | * netcdf file. |
---|
1093 | */ |
---|
1094 | static int |
---|
1095 | NC_computeshapes(NC *ncp) |
---|
1096 | { |
---|
1097 | NC_var **vpp = (NC_var **)ncp->vars.value; |
---|
1098 | NC_var *const *const end = &vpp[ncp->vars.nelems]; |
---|
1099 | NC_var *first_var = NULL; /* first "non-record" var */ |
---|
1100 | NC_var *first_rec = NULL; /* first "record" var */ |
---|
1101 | int status; |
---|
1102 | |
---|
1103 | ncp->begin_var = (off_t) ncp->xsz; |
---|
1104 | ncp->begin_rec = (off_t) ncp->xsz; |
---|
1105 | ncp->recsize = 0; |
---|
1106 | |
---|
1107 | if(ncp->vars.nelems == 0) |
---|
1108 | return(0); |
---|
1109 | |
---|
1110 | for( /*NADA*/; vpp < end; vpp++) |
---|
1111 | { |
---|
1112 | status = NC_var_shape(*vpp, &ncp->dims); |
---|
1113 | if(status != ENOERR) |
---|
1114 | return(status); |
---|
1115 | |
---|
1116 | if(IS_RECVAR(*vpp)) |
---|
1117 | { |
---|
1118 | if(first_rec == NULL) |
---|
1119 | first_rec = *vpp; |
---|
1120 | if((*vpp)->len == UINT32_MAX) |
---|
1121 | ncp->recsize += (*vpp)->dsizes[0]; |
---|
1122 | else |
---|
1123 | ncp->recsize += (*vpp)->len; |
---|
1124 | } |
---|
1125 | else |
---|
1126 | { |
---|
1127 | if(first_var == NULL) |
---|
1128 | first_var = *vpp; |
---|
1129 | /* |
---|
1130 | * Overwritten each time thru. |
---|
1131 | * Usually overwritten in first_rec != NULL clause below. |
---|
1132 | */ |
---|
1133 | ncp->begin_rec = (*vpp)->begin + (off_t)(*vpp)->len; |
---|
1134 | } |
---|
1135 | } |
---|
1136 | |
---|
1137 | if(first_rec != NULL) |
---|
1138 | { |
---|
1139 | assert(ncp->begin_rec <= first_rec->begin); |
---|
1140 | ncp->begin_rec = first_rec->begin; |
---|
1141 | /* |
---|
1142 | * for special case of exactly one record variable, pack value |
---|
1143 | */ |
---|
1144 | if(ncp->recsize == first_rec->len) |
---|
1145 | ncp->recsize = *first_rec->dsizes * first_rec->xsz; |
---|
1146 | } |
---|
1147 | |
---|
1148 | if(first_var != NULL) |
---|
1149 | { |
---|
1150 | ncp->begin_var = first_var->begin; |
---|
1151 | } |
---|
1152 | else |
---|
1153 | { |
---|
1154 | ncp->begin_var = ncp->begin_rec; |
---|
1155 | } |
---|
1156 | |
---|
1157 | assert(ncp->begin_var > 0); |
---|
1158 | assert(ncp->xsz <= (size_t)ncp->begin_var); |
---|
1159 | assert(ncp->begin_rec > 0); |
---|
1160 | assert(ncp->begin_var <= ncp->begin_rec); |
---|
1161 | |
---|
1162 | return(ENOERR); |
---|
1163 | } |
---|
1164 | |
---|
1165 | /* How much space in the header is required for the NC data structure? */ |
---|
1166 | size_t |
---|
1167 | ncx_len_NC(const NC *ncp, size_t sizeof_off_t) |
---|
1168 | { |
---|
1169 | size_t xlen = sizeof(ncmagic); |
---|
1170 | |
---|
1171 | assert(ncp != NULL); |
---|
1172 | |
---|
1173 | xlen += X_SIZEOF_SIZE_T; /* numrecs */ |
---|
1174 | xlen += ncx_len_NC_dimarray(&ncp->dims); |
---|
1175 | xlen += ncx_len_NC_attrarray(&ncp->attrs); |
---|
1176 | xlen += ncx_len_NC_vararray(&ncp->vars, sizeof_off_t); |
---|
1177 | |
---|
1178 | return xlen; |
---|
1179 | } |
---|
1180 | |
---|
1181 | |
---|
1182 | /* Write the file header */ |
---|
1183 | int |
---|
1184 | ncx_put_NC(const NC *ncp, void **xpp, off_t offset, size_t extent) |
---|
1185 | { |
---|
1186 | int status = ENOERR; |
---|
1187 | v1hs ps; /* the get stream */ |
---|
1188 | |
---|
1189 | assert(ncp != NULL); |
---|
1190 | |
---|
1191 | /* Initialize stream ps */ |
---|
1192 | |
---|
1193 | ps.nciop = ncp->nciop; |
---|
1194 | ps.flags = RGN_WRITE; |
---|
1195 | |
---|
1196 | if (ncp->flags & NC_64BIT_OFFSET) |
---|
1197 | ps.version = 2; |
---|
1198 | else |
---|
1199 | ps.version = 1; |
---|
1200 | |
---|
1201 | if(xpp == NULL) |
---|
1202 | { |
---|
1203 | /* |
---|
1204 | * Come up with a reasonable stream read size. |
---|
1205 | */ |
---|
1206 | extent = ncp->xsz; |
---|
1207 | if(extent <= MIN_NC_XSZ) |
---|
1208 | { |
---|
1209 | /* first time read */ |
---|
1210 | extent = ncp->chunk; |
---|
1211 | /* Protection for when ncp->chunk is huge; |
---|
1212 | * no need to read hugely. */ |
---|
1213 | if(extent > 4096) |
---|
1214 | extent = 4096; |
---|
1215 | } |
---|
1216 | else if(extent > ncp->chunk) |
---|
1217 | extent = ncp->chunk; |
---|
1218 | |
---|
1219 | ps.offset = 0; |
---|
1220 | ps.extent = extent; |
---|
1221 | ps.base = NULL; |
---|
1222 | ps.pos = ps.base; |
---|
1223 | |
---|
1224 | status = fault_v1hs(&ps, extent); |
---|
1225 | if(status) |
---|
1226 | return status; |
---|
1227 | } |
---|
1228 | else |
---|
1229 | { |
---|
1230 | ps.offset = offset; |
---|
1231 | ps.extent = extent; |
---|
1232 | ps.base = *xpp; |
---|
1233 | ps.pos = ps.base; |
---|
1234 | ps.end = (char *)ps.base + ps.extent; |
---|
1235 | } |
---|
1236 | |
---|
1237 | if (ps.version == 2) |
---|
1238 | status = ncx_putn_schar_schar(&ps.pos, sizeof(ncmagic), ncmagic); |
---|
1239 | else |
---|
1240 | status = ncx_putn_schar_schar(&ps.pos, sizeof(ncmagic1), ncmagic1); |
---|
1241 | if(status != ENOERR) |
---|
1242 | goto release; |
---|
1243 | |
---|
1244 | { |
---|
1245 | const size_t nrecs = NC_get_numrecs(ncp); |
---|
1246 | status = ncx_put_size_t(&ps.pos, &nrecs); |
---|
1247 | if(status != ENOERR) |
---|
1248 | goto release; |
---|
1249 | } |
---|
1250 | |
---|
1251 | assert((char *)ps.pos < (char *)ps.end); |
---|
1252 | |
---|
1253 | status = v1h_put_NC_dimarray(&ps, &ncp->dims); |
---|
1254 | if(status != ENOERR) |
---|
1255 | goto release; |
---|
1256 | |
---|
1257 | status = v1h_put_NC_attrarray(&ps, &ncp->attrs); |
---|
1258 | if(status != ENOERR) |
---|
1259 | goto release; |
---|
1260 | |
---|
1261 | status = v1h_put_NC_vararray(&ps, &ncp->vars); |
---|
1262 | if(status != ENOERR) |
---|
1263 | goto release; |
---|
1264 | |
---|
1265 | release: |
---|
1266 | (void) rel_v1hs(&ps); |
---|
1267 | |
---|
1268 | return status; |
---|
1269 | } |
---|
1270 | |
---|
1271 | |
---|
1272 | /* Make the in-memory NC structure from reading the file header */ |
---|
1273 | int |
---|
1274 | nc_get_NC(NC *ncp) |
---|
1275 | { |
---|
1276 | int status; |
---|
1277 | v1hs gs; /* the get stream */ |
---|
1278 | |
---|
1279 | assert(ncp != NULL); |
---|
1280 | |
---|
1281 | /* Initialize stream gs */ |
---|
1282 | |
---|
1283 | gs.nciop = ncp->nciop; |
---|
1284 | gs.offset = 0; /* beginning of file */ |
---|
1285 | gs.extent = 0; |
---|
1286 | gs.flags = 0; |
---|
1287 | gs.version = 0; |
---|
1288 | gs.base = NULL; |
---|
1289 | gs.pos = gs.base; |
---|
1290 | |
---|
1291 | { |
---|
1292 | /* |
---|
1293 | * Come up with a reasonable stream read size. |
---|
1294 | */ |
---|
1295 | off_t filesize; |
---|
1296 | size_t extent = MIN_NC_XSZ; |
---|
1297 | |
---|
1298 | extent = ncp->xsz; |
---|
1299 | if(extent <= MIN_NC_XSZ) |
---|
1300 | { |
---|
1301 | status = ncio_filesize(ncp->nciop, &filesize); |
---|
1302 | if(status) |
---|
1303 | return status; |
---|
1304 | if(filesize < sizeof(ncmagic)) { /* too small, not netcdf */ |
---|
1305 | |
---|
1306 | status = NC_ENOTNC; |
---|
1307 | return status; |
---|
1308 | } |
---|
1309 | /* first time read */ |
---|
1310 | extent = ncp->chunk; |
---|
1311 | /* Protection for when ncp->chunk is huge; |
---|
1312 | * no need to read hugely. */ |
---|
1313 | if(extent > 4096) |
---|
1314 | extent = 4096; |
---|
1315 | if(extent > filesize) |
---|
1316 | extent = filesize; |
---|
1317 | } |
---|
1318 | else if(extent > ncp->chunk) |
---|
1319 | extent = ncp->chunk; |
---|
1320 | |
---|
1321 | /* |
---|
1322 | * Invalidate the I/O buffers to force a read of the header |
---|
1323 | * region. |
---|
1324 | */ |
---|
1325 | status = ncio_sync(gs.nciop); |
---|
1326 | if(status) |
---|
1327 | return status; |
---|
1328 | |
---|
1329 | status = fault_v1hs(&gs, extent); |
---|
1330 | if(status) |
---|
1331 | return status; |
---|
1332 | } |
---|
1333 | |
---|
1334 | /* get the header from the stream gs */ |
---|
1335 | |
---|
1336 | { |
---|
1337 | /* Get & check magic number */ |
---|
1338 | schar magic[sizeof(ncmagic)]; |
---|
1339 | (void) memset(magic, 0, sizeof(magic)); |
---|
1340 | |
---|
1341 | status = ncx_getn_schar_schar( |
---|
1342 | (const void **)(&gs.pos), sizeof(magic), magic); |
---|
1343 | if(status != ENOERR) |
---|
1344 | goto unwind_get; |
---|
1345 | |
---|
1346 | if(memcmp(magic, ncmagic, sizeof(ncmagic)-1) != 0) |
---|
1347 | { |
---|
1348 | status = NC_ENOTNC; |
---|
1349 | goto unwind_get; |
---|
1350 | } |
---|
1351 | /* Check version number in last byte of magic */ |
---|
1352 | if (magic[sizeof(ncmagic)-1] == 0x1) { |
---|
1353 | gs.version = 1; |
---|
1354 | } else if (magic[sizeof(ncmagic)-1] == 0x2) { |
---|
1355 | gs.version = 2; |
---|
1356 | fSet(ncp->flags, NC_64BIT_OFFSET); |
---|
1357 | /* Now we support version 2 file access on non-LFS systems -- rkr */ |
---|
1358 | #if 0 |
---|
1359 | if (sizeof(off_t) != 8) { |
---|
1360 | fprintf(stderr, "NETCDF WARNING: Version 2 file on 32-bit system.\n"); |
---|
1361 | } |
---|
1362 | #endif |
---|
1363 | } else { |
---|
1364 | status = NC_ENOTNC; |
---|
1365 | goto unwind_get; |
---|
1366 | } |
---|
1367 | } |
---|
1368 | |
---|
1369 | { |
---|
1370 | size_t nrecs = 0; |
---|
1371 | status = ncx_get_size_t((const void **)(&gs.pos), &nrecs); |
---|
1372 | if(status != ENOERR) |
---|
1373 | goto unwind_get; |
---|
1374 | NC_set_numrecs(ncp, nrecs); |
---|
1375 | } |
---|
1376 | |
---|
1377 | assert((char *)gs.pos < (char *)gs.end); |
---|
1378 | |
---|
1379 | status = v1h_get_NC_dimarray(&gs, &ncp->dims); |
---|
1380 | if(status != ENOERR) |
---|
1381 | goto unwind_get; |
---|
1382 | |
---|
1383 | status = v1h_get_NC_attrarray(&gs, &ncp->attrs); |
---|
1384 | if(status != ENOERR) |
---|
1385 | goto unwind_get; |
---|
1386 | |
---|
1387 | status = v1h_get_NC_vararray(&gs, &ncp->vars); |
---|
1388 | if(status != ENOERR) |
---|
1389 | goto unwind_get; |
---|
1390 | |
---|
1391 | ncp->xsz = ncx_len_NC(ncp, (gs.version == 1) ? 4 : 8); |
---|
1392 | |
---|
1393 | status = NC_computeshapes(ncp); |
---|
1394 | if(status != ENOERR) |
---|
1395 | goto unwind_get; |
---|
1396 | |
---|
1397 | unwind_get: |
---|
1398 | (void) rel_v1hs(&gs); |
---|
1399 | return status; |
---|
1400 | } |
---|