Commit | Line | Data |
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93509525 | 1 | /* Low-level I/O routines for BFDs. |
7c192733 | 2 | |
b3adc24a | 3 | Copyright (C) 1990-2020 Free Software Foundation, Inc. |
7c192733 | 4 | |
93509525 KD |
5 | Written by Cygnus Support. |
6 | ||
cd123cb7 | 7 | This file is part of BFD, the Binary File Descriptor library. |
93509525 | 8 | |
cd123cb7 NC |
9 | This program is free software; you can redistribute it and/or modify |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 3 of the License, or | |
12 | (at your option) any later version. | |
93509525 | 13 | |
cd123cb7 NC |
14 | This program is distributed in the hope that it will be useful, |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
93509525 | 18 | |
cd123cb7 NC |
19 | You should have received a copy of the GNU General Public License |
20 | along with this program; if not, write to the Free Software | |
21 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
22 | MA 02110-1301, USA. */ | |
93509525 KD |
23 | |
24 | #include "sysdep.h" | |
3db64b00 | 25 | #include <limits.h> |
93509525 KD |
26 | #include "bfd.h" |
27 | #include "libbfd.h" | |
b570b954 | 28 | #include "aout/ar.h" |
0b8448af NC |
29 | #if defined (_WIN32) |
30 | #include <windows.h> | |
31 | #endif | |
93509525 | 32 | |
93509525 KD |
33 | #ifndef S_IXUSR |
34 | #define S_IXUSR 0100 /* Execute by owner. */ | |
35 | #endif | |
36 | #ifndef S_IXGRP | |
37 | #define S_IXGRP 0010 /* Execute by group. */ | |
38 | #endif | |
39 | #ifndef S_IXOTH | |
40 | #define S_IXOTH 0001 /* Execute by others. */ | |
41 | #endif | |
42 | ||
428b207a TT |
43 | #ifndef FD_CLOEXEC |
44 | #define FD_CLOEXEC 1 | |
45 | #endif | |
46 | ||
7c192733 | 47 | file_ptr |
c7c3d11b | 48 | _bfd_real_ftell (FILE *file) |
7c192733 AC |
49 | { |
50 | #if defined (HAVE_FTELLO64) | |
51 | return ftello64 (file); | |
52 | #elif defined (HAVE_FTELLO) | |
53 | return ftello (file); | |
54 | #else | |
55 | return ftell (file); | |
56 | #endif | |
57 | } | |
58 | ||
59 | int | |
c7c3d11b | 60 | _bfd_real_fseek (FILE *file, file_ptr offset, int whence) |
7c192733 AC |
61 | { |
62 | #if defined (HAVE_FSEEKO64) | |
63 | return fseeko64 (file, offset, whence); | |
64 | #elif defined (HAVE_FSEEKO) | |
65 | return fseeko (file, offset, whence); | |
66 | #else | |
67 | return fseek (file, offset, whence); | |
68 | #endif | |
69 | } | |
70 | ||
428b207a TT |
71 | /* Mark FILE as close-on-exec. Return FILE. FILE may be NULL, in |
72 | which case nothing is done. */ | |
73 | static FILE * | |
74 | close_on_exec (FILE *file) | |
75 | { | |
76 | #if defined (HAVE_FILENO) && defined (F_GETFD) | |
77 | if (file) | |
78 | { | |
79 | int fd = fileno (file); | |
80 | int old = fcntl (fd, F_GETFD, 0); | |
81 | if (old >= 0) | |
82 | fcntl (fd, F_SETFD, old | FD_CLOEXEC); | |
83 | } | |
84 | #endif | |
85 | return file; | |
86 | } | |
87 | ||
2e6f4fae | 88 | FILE * |
c7c3d11b | 89 | _bfd_real_fopen (const char *filename, const char *modes) |
2e6f4fae | 90 | { |
d387240a | 91 | #ifdef VMS |
d387240a TG |
92 | char *vms_attr; |
93 | ||
9aff4b7a | 94 | /* On VMS, fopen allows file attributes as optional arguments. |
d387240a TG |
95 | We need to use them but we'd better to use the common prototype. |
96 | In fopen-vms.h, they are separated from the mode with a comma. | |
97 | Split here. */ | |
98 | vms_attr = strchr (modes, ','); | |
0b8448af | 99 | if (vms_attr != NULL) |
d387240a | 100 | { |
0c376465 TG |
101 | /* Attributes found. Split. */ |
102 | size_t modes_len = strlen (modes) + 1; | |
103 | char attrs[modes_len + 1]; | |
104 | char *at[3]; | |
105 | int i; | |
106 | ||
107 | memcpy (attrs, modes, modes_len); | |
108 | at[0] = attrs; | |
109 | for (i = 0; i < 2; i++) | |
110 | { | |
111 | at[i + 1] = strchr (at[i], ','); | |
112 | BFD_ASSERT (at[i + 1] != NULL); | |
113 | *(at[i + 1]++) = 0; /* Replace ',' with a nul, and skip it. */ | |
114 | } | |
115 | return close_on_exec (fopen (filename, at[0], at[1], at[2])); | |
d387240a | 116 | } |
0b8448af NC |
117 | |
118 | #elif defined (_WIN32) | |
119 | size_t filelen = strlen (filename) + 1; | |
120 | ||
121 | if (filelen > MAX_PATH - 1) | |
122 | { | |
123 | FILE *file; | |
124 | char* fullpath = (char *) malloc (filelen + 8); | |
125 | ||
126 | /* Add a Microsoft recommended prefix that | |
127 | will allow the extra-long path to work. */ | |
128 | strcpy (fullpath, "\\\\?\\"); | |
129 | strcat (fullpath, filename); | |
130 | file = close_on_exec (fopen (fullpath, modes)); | |
131 | free (fullpath); | |
132 | return file; | |
133 | } | |
134 | ||
135 | #elif defined (HAVE_FOPEN64) | |
428b207a | 136 | return close_on_exec (fopen64 (filename, modes)); |
2e6f4fae | 137 | #endif |
0b8448af NC |
138 | |
139 | return close_on_exec (fopen (filename, modes)); | |
2e6f4fae DJ |
140 | } |
141 | ||
40838a72 AC |
142 | /* |
143 | INTERNAL_DEFINITION | |
144 | struct bfd_iovec | |
93509525 | 145 | |
40838a72 | 146 | DESCRIPTION |
93509525 | 147 | |
40838a72 AC |
148 | The <<struct bfd_iovec>> contains the internal file I/O class. |
149 | Each <<BFD>> has an instance of this class and all file I/O is | |
150 | routed through it (it is assumed that the instance implements | |
151 | all methods listed below). | |
152 | ||
153 | .struct bfd_iovec | |
154 | .{ | |
155 | . {* To avoid problems with macros, a "b" rather than "f" | |
156 | . prefix is prepended to each method name. *} | |
157 | . {* Attempt to read/write NBYTES on ABFD's IOSTREAM storing/fetching | |
158 | . bytes starting at PTR. Return the number of bytes actually | |
159 | . transfered (a read past end-of-file returns less than NBYTES), | |
160 | . or -1 (setting <<bfd_error>>) if an error occurs. *} | |
161 | . file_ptr (*bread) (struct bfd *abfd, void *ptr, file_ptr nbytes); | |
162 | . file_ptr (*bwrite) (struct bfd *abfd, const void *ptr, | |
07d6d2b8 | 163 | . file_ptr nbytes); |
40838a72 AC |
164 | . {* Return the current IOSTREAM file offset, or -1 (setting <<bfd_error>> |
165 | . if an error occurs. *} | |
166 | . file_ptr (*btell) (struct bfd *abfd); | |
167 | . {* For the following, on successful completion a value of 0 is returned. | |
07d6d2b8 | 168 | . Otherwise, a value of -1 is returned (and <<bfd_error>> is set). *} |
40838a72 | 169 | . int (*bseek) (struct bfd *abfd, file_ptr offset, int whence); |
405bf443 | 170 | . int (*bclose) (struct bfd *abfd); |
40838a72 AC |
171 | . int (*bflush) (struct bfd *abfd); |
172 | . int (*bstat) (struct bfd *abfd, struct stat *sb); | |
4c95ab76 TG |
173 | . {* Mmap a part of the files. ADDR, LEN, PROT, FLAGS and OFFSET are the usual |
174 | . mmap parameter, except that LEN and OFFSET do not need to be page | |
175 | . aligned. Returns (void *)-1 on failure, mmapped address on success. | |
176 | . Also write in MAP_ADDR the address of the page aligned buffer and in | |
177 | . MAP_LEN the size mapped (a page multiple). Use unmap with MAP_ADDR and | |
178 | . MAP_LEN to unmap. *} | |
f07749bb | 179 | . void *(*bmmap) (struct bfd *abfd, void *addr, bfd_size_type len, |
07d6d2b8 AM |
180 | . int prot, int flags, file_ptr offset, |
181 | . void **map_addr, bfd_size_type *map_len); | |
40838a72 | 182 | .}; |
93509525 | 183 | |
65077aa8 TG |
184 | .extern const struct bfd_iovec _bfd_memory_iovec; |
185 | ||
40838a72 | 186 | */ |
93509525 | 187 | |
93509525 KD |
188 | |
189 | /* Return value is amount read. */ | |
190 | ||
191 | bfd_size_type | |
c58b9523 | 192 | bfd_bread (void *ptr, bfd_size_type size, bfd *abfd) |
93509525 | 193 | { |
5c4ce239 AM |
194 | file_ptr nread; |
195 | bfd *element_bfd = abfd; | |
196 | ufile_ptr offset = 0; | |
197 | ||
198 | while (abfd->my_archive != NULL | |
199 | && !bfd_is_thin_archive (abfd->my_archive)) | |
200 | { | |
201 | offset += abfd->origin; | |
202 | abfd = abfd->my_archive; | |
203 | } | |
93509525 | 204 | |
1fb41da4 AM |
205 | /* If this is an archive element, don't read past the end of |
206 | this element. */ | |
5c4ce239 | 207 | if (element_bfd->arelt_data != NULL) |
1fb41da4 | 208 | { |
5c4ce239 | 209 | bfd_size_type maxbytes = arelt_size (element_bfd); |
f1bb16f8 | 210 | |
5c4ce239 | 211 | if (abfd->where < offset || abfd->where - offset >= maxbytes) |
07d6d2b8 | 212 | { |
5c4ce239 AM |
213 | bfd_set_error (bfd_error_invalid_operation); |
214 | return -1; | |
07d6d2b8 | 215 | } |
5c4ce239 AM |
216 | if (abfd->where - offset + size > maxbytes) |
217 | size = maxbytes - (abfd->where - offset); | |
1fb41da4 AM |
218 | } |
219 | ||
5c4ce239 AM |
220 | if (abfd->iovec == NULL) |
221 | { | |
222 | bfd_set_error (bfd_error_invalid_operation); | |
223 | return -1; | |
224 | } | |
225 | ||
226 | nread = abfd->iovec->bread (abfd, ptr, size); | |
227 | if (nread != -1) | |
93509525 KD |
228 | abfd->where += nread; |
229 | ||
93509525 KD |
230 | return nread; |
231 | } | |
232 | ||
233 | bfd_size_type | |
c58b9523 | 234 | bfd_bwrite (const void *ptr, bfd_size_type size, bfd *abfd) |
93509525 | 235 | { |
5c4ce239 | 236 | file_ptr nwrote; |
93509525 | 237 | |
5c4ce239 AM |
238 | while (abfd->my_archive != NULL |
239 | && !bfd_is_thin_archive (abfd->my_archive)) | |
240 | abfd = abfd->my_archive; | |
69fd4758 | 241 | |
5c4ce239 AM |
242 | if (abfd->iovec == NULL) |
243 | { | |
244 | bfd_set_error (bfd_error_invalid_operation); | |
245 | return -1; | |
246 | } | |
247 | ||
248 | nwrote = abfd->iovec->bwrite (abfd, ptr, size); | |
249 | if (nwrote != -1) | |
93509525 | 250 | abfd->where += nwrote; |
5c4ce239 | 251 | if ((bfd_size_type) nwrote != size) |
93509525 KD |
252 | { |
253 | #ifdef ENOSPC | |
254 | errno = ENOSPC; | |
255 | #endif | |
256 | bfd_set_error (bfd_error_system_call); | |
257 | } | |
258 | return nwrote; | |
259 | } | |
260 | ||
7c192733 | 261 | file_ptr |
c58b9523 | 262 | bfd_tell (bfd *abfd) |
93509525 | 263 | { |
5c4ce239 | 264 | ufile_ptr offset = 0; |
93509525 KD |
265 | file_ptr ptr; |
266 | ||
5c4ce239 AM |
267 | while (abfd->my_archive != NULL |
268 | && !bfd_is_thin_archive (abfd->my_archive)) | |
69fd4758 | 269 | { |
5c4ce239 AM |
270 | offset += abfd->origin; |
271 | abfd = abfd->my_archive; | |
69fd4758 | 272 | } |
93509525 | 273 | |
5c4ce239 AM |
274 | if (abfd->iovec == NULL) |
275 | return 0; | |
276 | ||
277 | ptr = abfd->iovec->btell (abfd); | |
93509525 | 278 | abfd->where = ptr; |
5c4ce239 | 279 | return ptr - offset; |
93509525 KD |
280 | } |
281 | ||
282 | int | |
c58b9523 | 283 | bfd_flush (bfd *abfd) |
93509525 | 284 | { |
5c4ce239 AM |
285 | while (abfd->my_archive != NULL |
286 | && !bfd_is_thin_archive (abfd->my_archive)) | |
287 | abfd = abfd->my_archive; | |
288 | ||
289 | if (abfd->iovec == NULL) | |
290 | return 0; | |
291 | ||
292 | return abfd->iovec->bflush (abfd); | |
93509525 KD |
293 | } |
294 | ||
295 | /* Returns 0 for success, negative value for failure (in which case | |
296 | bfd_get_error can retrieve the error code). */ | |
297 | int | |
c58b9523 | 298 | bfd_stat (bfd *abfd, struct stat *statbuf) |
93509525 | 299 | { |
93509525 KD |
300 | int result; |
301 | ||
5c4ce239 AM |
302 | while (abfd->my_archive != NULL |
303 | && !bfd_is_thin_archive (abfd->my_archive)) | |
304 | abfd = abfd->my_archive; | |
69fd4758 | 305 | |
5c4ce239 AM |
306 | if (abfd->iovec == NULL) |
307 | { | |
308 | bfd_set_error (bfd_error_invalid_operation); | |
309 | return -1; | |
310 | } | |
311 | ||
312 | result = abfd->iovec->bstat (abfd, statbuf); | |
93509525 KD |
313 | if (result < 0) |
314 | bfd_set_error (bfd_error_system_call); | |
315 | return result; | |
316 | } | |
317 | ||
318 | /* Returns 0 for success, nonzero for failure (in which case bfd_get_error | |
319 | can retrieve the error code). */ | |
320 | ||
321 | int | |
c58b9523 | 322 | bfd_seek (bfd *abfd, file_ptr position, int direction) |
93509525 KD |
323 | { |
324 | int result; | |
5c4ce239 | 325 | ufile_ptr offset = 0; |
93509525 | 326 | |
5c4ce239 AM |
327 | while (abfd->my_archive != NULL |
328 | && !bfd_is_thin_archive (abfd->my_archive)) | |
93509525 | 329 | { |
5c4ce239 AM |
330 | offset += abfd->origin; |
331 | abfd = abfd->my_archive; | |
93509525 | 332 | } |
93509525 | 333 | |
5c4ce239 | 334 | if (abfd->iovec == NULL) |
660722b0 | 335 | { |
5c4ce239 AM |
336 | bfd_set_error (bfd_error_invalid_operation); |
337 | return -1; | |
660722b0 | 338 | } |
93509525 | 339 | |
5c4ce239 AM |
340 | /* For the time being, a BFD may not seek to it's end. The problem |
341 | is that we don't easily have a way to recognize the end of an | |
342 | element in an archive. */ | |
343 | BFD_ASSERT (direction == SEEK_SET || direction == SEEK_CUR); | |
344 | ||
345 | if (direction != SEEK_CUR) | |
346 | position += offset; | |
69fd4758 | 347 | |
ff91d2f0 AM |
348 | if ((direction == SEEK_CUR && position == 0) |
349 | || (direction == SEEK_SET && (ufile_ptr) position == abfd->where)) | |
350 | return 0; | |
351 | ||
5c4ce239 | 352 | result = abfd->iovec->bseek (abfd, position, direction); |
93509525 KD |
353 | if (result != 0) |
354 | { | |
93509525 | 355 | /* An EINVAL error probably means that the file offset was |
07d6d2b8 | 356 | absurd. */ |
5c4ce239 | 357 | if (errno == EINVAL) |
93509525 KD |
358 | bfd_set_error (bfd_error_file_truncated); |
359 | else | |
5c4ce239 | 360 | bfd_set_error (bfd_error_system_call); |
93509525 KD |
361 | } |
362 | else | |
363 | { | |
364 | /* Adjust `where' field. */ | |
5c4ce239 | 365 | if (direction == SEEK_CUR) |
93509525 | 366 | abfd->where += position; |
5c4ce239 AM |
367 | else |
368 | abfd->where = position; | |
93509525 | 369 | } |
5c4ce239 | 370 | |
93509525 KD |
371 | return result; |
372 | } | |
373 | ||
374 | /* | |
375 | FUNCTION | |
376 | bfd_get_mtime | |
377 | ||
378 | SYNOPSIS | |
c58b9523 | 379 | long bfd_get_mtime (bfd *abfd); |
93509525 KD |
380 | |
381 | DESCRIPTION | |
382 | Return the file modification time (as read from the file system, or | |
383 | from the archive header for archive members). | |
384 | ||
385 | */ | |
386 | ||
387 | long | |
c58b9523 | 388 | bfd_get_mtime (bfd *abfd) |
93509525 | 389 | { |
93509525 KD |
390 | struct stat buf; |
391 | ||
392 | if (abfd->mtime_set) | |
393 | return abfd->mtime; | |
394 | ||
5c4ce239 | 395 | if (bfd_stat (abfd, &buf) != 0) |
93509525 KD |
396 | return 0; |
397 | ||
398 | abfd->mtime = buf.st_mtime; /* Save value in case anyone wants it */ | |
399 | return buf.st_mtime; | |
400 | } | |
401 | ||
402 | /* | |
403 | FUNCTION | |
404 | bfd_get_size | |
405 | ||
406 | SYNOPSIS | |
47fdcf63 | 407 | ufile_ptr bfd_get_size (bfd *abfd); |
93509525 KD |
408 | |
409 | DESCRIPTION | |
410 | Return the file size (as read from file system) for the file | |
411 | associated with BFD @var{abfd}. | |
412 | ||
413 | The initial motivation for, and use of, this routine is not | |
414 | so we can get the exact size of the object the BFD applies to, since | |
415 | that might not be generally possible (archive members for example). | |
416 | It would be ideal if someone could eventually modify | |
417 | it so that such results were guaranteed. | |
418 | ||
419 | Instead, we want to ask questions like "is this NNN byte sized | |
420 | object I'm about to try read from file offset YYY reasonable?" | |
421 | As as example of where we might do this, some object formats | |
422 | use string tables for which the first <<sizeof (long)>> bytes of the | |
423 | table contain the size of the table itself, including the size bytes. | |
424 | If an application tries to read what it thinks is one of these | |
425 | string tables, without some way to validate the size, and for | |
426 | some reason the size is wrong (byte swapping error, wrong location | |
427 | for the string table, etc.), the only clue is likely to be a read | |
428 | error when it tries to read the table, or a "virtual memory | |
429 | exhausted" error when it tries to allocate 15 bazillon bytes | |
430 | of space for the 15 bazillon byte table it is about to read. | |
5c4491d3 | 431 | This function at least allows us to answer the question, "is the |
93509525 | 432 | size reasonable?". |
b03202e3 AM |
433 | |
434 | A return value of zero indicates the file size is unknown. | |
93509525 KD |
435 | */ |
436 | ||
47fdcf63 | 437 | ufile_ptr |
c58b9523 | 438 | bfd_get_size (bfd *abfd) |
93509525 | 439 | { |
b03202e3 AM |
440 | /* A size of 0 means we haven't yet called bfd_stat. A size of 1 |
441 | means we have a cached value of 0, ie. unknown. */ | |
442 | if (abfd->size <= 1 || bfd_write_p (abfd)) | |
443 | { | |
444 | struct stat buf; | |
93509525 | 445 | |
b03202e3 AM |
446 | if (abfd->size == 1 && !bfd_write_p (abfd)) |
447 | return 0; | |
93509525 | 448 | |
b03202e3 AM |
449 | if (bfd_stat (abfd, &buf) != 0 |
450 | || buf.st_size == 0 | |
451 | || buf.st_size - (ufile_ptr) buf.st_size != 0) | |
452 | { | |
453 | abfd->size = 1; | |
454 | return 0; | |
455 | } | |
456 | abfd->size = buf.st_size; | |
457 | } | |
458 | return abfd->size; | |
93509525 | 459 | } |
25b88f33 | 460 | |
8e2f54bc L |
461 | /* |
462 | FUNCTION | |
463 | bfd_get_file_size | |
464 | ||
465 | SYNOPSIS | |
47fdcf63 | 466 | ufile_ptr bfd_get_file_size (bfd *abfd); |
8e2f54bc L |
467 | |
468 | DESCRIPTION | |
469 | Return the file size (as read from file system) for the file | |
470 | associated with BFD @var{abfd}. It supports both normal files | |
471 | and archive elements. | |
472 | ||
473 | */ | |
474 | ||
47fdcf63 | 475 | ufile_ptr |
8e2f54bc L |
476 | bfd_get_file_size (bfd *abfd) |
477 | { | |
b570b954 AM |
478 | ufile_ptr file_size, archive_size = (ufile_ptr) -1; |
479 | ||
8e2f54bc L |
480 | if (abfd->my_archive != NULL |
481 | && !bfd_is_thin_archive (abfd->my_archive)) | |
b570b954 AM |
482 | { |
483 | struct areltdata *adata = (struct areltdata *) abfd->arelt_data; | |
484 | archive_size = adata->parsed_size; | |
485 | /* If the archive is compressed we can't compare against file size. */ | |
486 | if (memcmp (((struct ar_hdr *) adata->arch_header)->ar_fmag, | |
487 | "Z\012", 2) == 0) | |
488 | return archive_size; | |
489 | abfd = abfd->my_archive; | |
490 | } | |
8e2f54bc | 491 | |
b570b954 AM |
492 | file_size = bfd_get_size (abfd); |
493 | if (archive_size < file_size) | |
494 | return archive_size; | |
495 | return file_size; | |
8e2f54bc | 496 | } |
25b88f33 PP |
497 | |
498 | /* | |
499 | FUNCTION | |
500 | bfd_mmap | |
501 | ||
502 | SYNOPSIS | |
503 | void *bfd_mmap (bfd *abfd, void *addr, bfd_size_type len, | |
07d6d2b8 AM |
504 | int prot, int flags, file_ptr offset, |
505 | void **map_addr, bfd_size_type *map_len); | |
25b88f33 PP |
506 | |
507 | DESCRIPTION | |
508 | Return mmap()ed region of the file, if possible and implemented. | |
07d6d2b8 AM |
509 | LEN and OFFSET do not need to be page aligned. The page aligned |
510 | address and length are written to MAP_ADDR and MAP_LEN. | |
25b88f33 PP |
511 | |
512 | */ | |
513 | ||
514 | void * | |
515 | bfd_mmap (bfd *abfd, void *addr, bfd_size_type len, | |
4c95ab76 | 516 | int prot, int flags, file_ptr offset, |
07d6d2b8 | 517 | void **map_addr, bfd_size_type *map_len) |
25b88f33 | 518 | { |
5c4ce239 AM |
519 | while (abfd->my_archive != NULL |
520 | && !bfd_is_thin_archive (abfd->my_archive)) | |
521 | { | |
522 | offset += abfd->origin; | |
523 | abfd = abfd->my_archive; | |
524 | } | |
25b88f33 PP |
525 | |
526 | if (abfd->iovec == NULL) | |
5c4ce239 AM |
527 | { |
528 | bfd_set_error (bfd_error_invalid_operation); | |
529 | return (void *) -1; | |
530 | } | |
25b88f33 | 531 | |
4c95ab76 | 532 | return abfd->iovec->bmmap (abfd, addr, len, prot, flags, offset, |
07d6d2b8 | 533 | map_addr, map_len); |
25b88f33 | 534 | } |
65077aa8 TG |
535 | |
536 | /* Memory file I/O operations. */ | |
537 | ||
538 | static file_ptr | |
539 | memory_bread (bfd *abfd, void *ptr, file_ptr size) | |
540 | { | |
541 | struct bfd_in_memory *bim; | |
542 | bfd_size_type get; | |
543 | ||
544 | bim = (struct bfd_in_memory *) abfd->iostream; | |
545 | get = size; | |
546 | if (abfd->where + get > bim->size) | |
547 | { | |
548 | if (bim->size < (bfd_size_type) abfd->where) | |
07d6d2b8 | 549 | get = 0; |
65077aa8 | 550 | else |
07d6d2b8 | 551 | get = bim->size - abfd->where; |
65077aa8 TG |
552 | bfd_set_error (bfd_error_file_truncated); |
553 | } | |
554 | memcpy (ptr, bim->buffer + abfd->where, (size_t) get); | |
555 | return get; | |
556 | } | |
557 | ||
558 | static file_ptr | |
559 | memory_bwrite (bfd *abfd, const void *ptr, file_ptr size) | |
560 | { | |
561 | struct bfd_in_memory *bim = (struct bfd_in_memory *) abfd->iostream; | |
562 | ||
563 | if (abfd->where + size > bim->size) | |
564 | { | |
565 | bfd_size_type newsize, oldsize; | |
566 | ||
567 | oldsize = (bim->size + 127) & ~(bfd_size_type) 127; | |
568 | bim->size = abfd->where + size; | |
569 | /* Round up to cut down on memory fragmentation */ | |
570 | newsize = (bim->size + 127) & ~(bfd_size_type) 127; | |
571 | if (newsize > oldsize) | |
07d6d2b8 AM |
572 | { |
573 | bim->buffer = (bfd_byte *) bfd_realloc_or_free (bim->buffer, newsize); | |
574 | if (bim->buffer == NULL) | |
575 | { | |
576 | bim->size = 0; | |
577 | return 0; | |
578 | } | |
579 | if (newsize > bim->size) | |
580 | memset (bim->buffer + bim->size, 0, newsize - bim->size); | |
581 | } | |
65077aa8 TG |
582 | } |
583 | memcpy (bim->buffer + abfd->where, ptr, (size_t) size); | |
584 | return size; | |
585 | } | |
586 | ||
587 | static file_ptr | |
588 | memory_btell (bfd *abfd) | |
589 | { | |
590 | return abfd->where; | |
591 | } | |
592 | ||
593 | static int | |
594 | memory_bseek (bfd *abfd, file_ptr position, int direction) | |
595 | { | |
596 | file_ptr nwhere; | |
597 | struct bfd_in_memory *bim; | |
598 | ||
599 | bim = (struct bfd_in_memory *) abfd->iostream; | |
600 | ||
601 | if (direction == SEEK_SET) | |
602 | nwhere = position; | |
603 | else | |
604 | nwhere = abfd->where + position; | |
605 | ||
606 | if (nwhere < 0) | |
607 | { | |
608 | abfd->where = 0; | |
609 | errno = EINVAL; | |
610 | return -1; | |
611 | } | |
612 | ||
613 | if ((bfd_size_type)nwhere > bim->size) | |
614 | { | |
615 | if (abfd->direction == write_direction | |
07d6d2b8 AM |
616 | || abfd->direction == both_direction) |
617 | { | |
618 | bfd_size_type newsize, oldsize; | |
619 | ||
620 | oldsize = (bim->size + 127) & ~(bfd_size_type) 127; | |
621 | bim->size = nwhere; | |
622 | /* Round up to cut down on memory fragmentation */ | |
623 | newsize = (bim->size + 127) & ~(bfd_size_type) 127; | |
624 | if (newsize > oldsize) | |
625 | { | |
626 | bim->buffer = (bfd_byte *) bfd_realloc_or_free (bim->buffer, newsize); | |
627 | if (bim->buffer == NULL) | |
628 | { | |
629 | errno = EINVAL; | |
630 | bim->size = 0; | |
631 | return -1; | |
632 | } | |
633 | memset (bim->buffer + oldsize, 0, newsize - oldsize); | |
634 | } | |
635 | } | |
65077aa8 | 636 | else |
07d6d2b8 AM |
637 | { |
638 | abfd->where = bim->size; | |
639 | errno = EINVAL; | |
640 | bfd_set_error (bfd_error_file_truncated); | |
641 | return -1; | |
642 | } | |
65077aa8 TG |
643 | } |
644 | return 0; | |
645 | } | |
646 | ||
405bf443 | 647 | static int |
65077aa8 TG |
648 | memory_bclose (struct bfd *abfd) |
649 | { | |
650 | struct bfd_in_memory *bim = (struct bfd_in_memory *) abfd->iostream; | |
651 | ||
652 | if (bim->buffer != NULL) | |
653 | free (bim->buffer); | |
654 | free (bim); | |
655 | abfd->iostream = NULL; | |
656 | ||
405bf443 | 657 | return 0; |
65077aa8 TG |
658 | } |
659 | ||
660 | static int | |
661 | memory_bflush (bfd *abfd ATTRIBUTE_UNUSED) | |
662 | { | |
663 | return 0; | |
664 | } | |
665 | ||
666 | static int | |
667 | memory_bstat (bfd *abfd, struct stat *statbuf) | |
668 | { | |
669 | struct bfd_in_memory *bim = (struct bfd_in_memory *) abfd->iostream; | |
670 | ||
b5dee4ea | 671 | memset (statbuf, 0, sizeof (*statbuf)); |
65077aa8 TG |
672 | statbuf->st_size = bim->size; |
673 | ||
674 | return 0; | |
675 | } | |
676 | ||
677 | static void * | |
678 | memory_bmmap (bfd *abfd ATTRIBUTE_UNUSED, void *addr ATTRIBUTE_UNUSED, | |
07d6d2b8 AM |
679 | bfd_size_type len ATTRIBUTE_UNUSED, int prot ATTRIBUTE_UNUSED, |
680 | int flags ATTRIBUTE_UNUSED, file_ptr offset ATTRIBUTE_UNUSED, | |
681 | void **map_addr ATTRIBUTE_UNUSED, | |
682 | bfd_size_type *map_len ATTRIBUTE_UNUSED) | |
65077aa8 TG |
683 | { |
684 | return (void *)-1; | |
685 | } | |
686 | ||
687 | const struct bfd_iovec _bfd_memory_iovec = | |
688 | { | |
689 | &memory_bread, &memory_bwrite, &memory_btell, &memory_bseek, | |
690 | &memory_bclose, &memory_bflush, &memory_bstat, &memory_bmmap | |
691 | }; |