bfd/bfdio.c

   1 /* Low-level I/O routines for BFDs.
   2
   3    Copyright (C) 1990-2022 Free Software Foundation, Inc.
   4
   5    Written by Cygnus Support.
   6
   7    This file is part of BFD, the Binary File Descriptor library.
   8
   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.
  13
  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.
  18
  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.  */
  23
  24 #include "sysdep.h"
  25 #include <limits.h>
  26 #include "bfd.h"
  27 #include "libbfd.h"
  28 #include "aout/ar.h"
  29 #if defined (_WIN32)
  30 #include <windows.h>
  31 #include <locale.h>
  32 #endif
  33
  34 #ifndef S_IXUSR
  35 #define S_IXUSR 0100    /* Execute by owner.  */
  36 #endif
  37 #ifndef S_IXGRP
  38 #define S_IXGRP 0010    /* Execute by group.  */
  39 #endif
  40 #ifndef S_IXOTH
  41 #define S_IXOTH 0001    /* Execute by others.  */
  42 #endif
  43
  44 #ifndef FD_CLOEXEC
  45 #define FD_CLOEXEC 1
  46 #endif
  47
  48 file_ptr
  49 _bfd_real_ftell (FILE *file)
  50 {
  51 #if defined (HAVE_FTELLO64)
  52   return ftello64 (file);
  53 #elif defined (HAVE_FTELLO)
  54   return ftello (file);
  55 #else
  56   return ftell (file);
  57 #endif
  58 }
  59
  60 int
  61 _bfd_real_fseek (FILE *file, file_ptr offset, int whence)
  62 {
  63 #if defined (HAVE_FSEEKO64)
  64   return fseeko64 (file, offset, whence);
  65 #elif defined (HAVE_FSEEKO)
  66   return fseeko (file, offset, whence);
  67 #else
  68   return fseek (file, offset, whence);
  69 #endif
  70 }
  71
  72 /* Mark FILE as close-on-exec.  Return FILE.  FILE may be NULL, in
  73    which case nothing is done.  */
  74 static FILE *
  75 close_on_exec (FILE *file)
  76 {
  77 #if defined (HAVE_FILENO) && defined (F_GETFD)
  78   if (file)
  79     {
  80       int fd = fileno (file);
  81       int old = fcntl (fd, F_GETFD, 0);
  82       if (old >= 0)
  83         fcntl (fd, F_SETFD, old | FD_CLOEXEC);
  84     }
  85 #endif
  86   return file;
  87 }
  88
  89 FILE *
  90 _bfd_real_fopen (const char *filename, const char *modes)
  91 {
  92 #ifdef VMS
  93   char *vms_attr;
  94
  95   /* On VMS, fopen allows file attributes as optional arguments.
  96      We need to use them but we'd better to use the common prototype.
  97      In fopen-vms.h, they are separated from the mode with a comma.
  98      Split here.  */
  99   vms_attr = strchr (modes, ',');
 100   if (vms_attr != NULL)
 101     {
 102       /* Attributes found.  Split.  */
 103       size_t modes_len = strlen (modes) + 1;
 104       char attrs[modes_len + 1];
 105       char *at[3];
 106       int i;
 107
 108       memcpy (attrs, modes, modes_len);
 109       at[0] = attrs;
 110       for (i = 0; i < 2; i++)
 111         {
 112           at[i + 1] = strchr (at[i], ',');
 113           BFD_ASSERT (at[i + 1] != NULL);
 114           *(at[i + 1]++) = 0; /* Replace ',' with a nul, and skip it.  */
 115         }
 116       return close_on_exec (fopen (filename, at[0], at[1], at[2]));
 117     }
 118
 119 #elif defined (_WIN32)
 120   /* PR 25713: Handle extra long path names possibly containing '..' and '.'.  */
 121    wchar_t **     lpFilePart = {NULL};
 122    const wchar_t  prefix[] = L"\\\\?\\";
 123    const size_t   partPathLen = strlen (filename) + 1;
 124 #ifdef __MINGW32__
 125 #if !HAVE_DECL____LC_CODEPAGE_FUNC
 126 /* This prototype was added to locale.h in version 9.0 of MinGW-w64.  */
 127    _CRTIMP unsigned int __cdecl ___lc_codepage_func (void);
 128 #endif
 129    const unsigned int cp = ___lc_codepage_func ();
 130 #else
 131    const unsigned int cp = CP_UTF8;
 132 #endif
 133
 134    /* Converting the partial path from ascii to unicode.
 135       1) Get the length: Calling with lpWideCharStr set to null returns the length.
 136       2) Convert the string: Calling with cbMultiByte set to -1 includes the terminating null.  */
 137    size_t         partPathWSize = MultiByteToWideChar (cp, 0, filename, -1, NULL, 0);
 138    wchar_t *      partPath = calloc (partPathWSize, sizeof(wchar_t));
 139    size_t         ix;
 140
 141    MultiByteToWideChar (cp, 0, filename, -1, partPath, partPathWSize);
 142
 143    /* Convert any UNIX style path separators into the DOS i.e. backslash separator.  */
 144    for (ix = 0; ix < partPathLen; ix++)
 145      if (IS_UNIX_DIR_SEPARATOR(filename[ix]))
 146        partPath[ix] = '\\';
 147
 148    /* Getting the full path from the provided partial path.
 149       1) Get the length.
 150       2) Resolve the path.  */
 151    long       fullPathWSize = GetFullPathNameW (partPath, 0, NULL, lpFilePart);
 152    wchar_t *  fullPath = calloc (fullPathWSize + sizeof(prefix) + 1, sizeof(wchar_t));
 153
 154    wcscpy (fullPath, prefix);
 155
 156    int        prefixLen = sizeof(prefix) / sizeof(wchar_t);
 157    wchar_t *  fullPathOffset = fullPath + prefixLen - 1;
 158
 159    GetFullPathNameW (partPath, fullPathWSize, fullPathOffset, lpFilePart);
 160    free (partPath);
 161
 162    /* It is non-standard for modes to exceed 16 characters.  */
 163    wchar_t    modesW[16];
 164
 165    MultiByteToWideChar (cp, 0, modes, -1, modesW, sizeof(modesW));
 166
 167    FILE *     file = _wfopen (fullPath, modesW);
 168    free (fullPath);
 169
 170    return close_on_exec (file);
 171
 172 #elif defined (HAVE_FOPEN64)
 173   return close_on_exec (fopen64 (filename, modes));
 174
 175 #else
 176   return close_on_exec (fopen (filename, modes));
 177 #endif
 178 }
 179
 180 /*
 181 INTERNAL_DEFINITION
 182         struct bfd_iovec
 183
 184 DESCRIPTION
 185
 186         The <<struct bfd_iovec>> contains the internal file I/O class.
 187         Each <<BFD>> has an instance of this class and all file I/O is
 188         routed through it (it is assumed that the instance implements
 189         all methods listed below).
 190
 191 .struct bfd_iovec
 192 .{
 193 .  {* To avoid problems with macros, a "b" rather than "f"
 194 .     prefix is prepended to each method name.  *}
 195 .  {* Attempt to read/write NBYTES on ABFD's IOSTREAM storing/fetching
 196 .     bytes starting at PTR.  Return the number of bytes actually
 197 .     transfered (a read past end-of-file returns less than NBYTES),
 198 .     or -1 (setting <<bfd_error>>) if an error occurs.  *}
 199 .  file_ptr (*bread) (struct bfd *abfd, void *ptr, file_ptr nbytes);
 200 .  file_ptr (*bwrite) (struct bfd *abfd, const void *ptr,
 201 .                      file_ptr nbytes);
 202 .  {* Return the current IOSTREAM file offset, or -1 (setting <<bfd_error>>
 203 .     if an error occurs.  *}
 204 .  file_ptr (*btell) (struct bfd *abfd);
 205 .  {* For the following, on successful completion a value of 0 is returned.
 206 .     Otherwise, a value of -1 is returned (and <<bfd_error>> is set).  *}
 207 .  int (*bseek) (struct bfd *abfd, file_ptr offset, int whence);
 208 .  int (*bclose) (struct bfd *abfd);
 209 .  int (*bflush) (struct bfd *abfd);
 210 .  int (*bstat) (struct bfd *abfd, struct stat *sb);
 211 .  {* Mmap a part of the files. ADDR, LEN, PROT, FLAGS and OFFSET are the usual
 212 .     mmap parameter, except that LEN and OFFSET do not need to be page
 213 .     aligned.  Returns (void *)-1 on failure, mmapped address on success.
 214 .     Also write in MAP_ADDR the address of the page aligned buffer and in
 215 .     MAP_LEN the size mapped (a page multiple).  Use unmap with MAP_ADDR and
 216 .     MAP_LEN to unmap.  *}
 217 .  void *(*bmmap) (struct bfd *abfd, void *addr, bfd_size_type len,
 218 .                  int prot, int flags, file_ptr offset,
 219 .                  void **map_addr, bfd_size_type *map_len);
 220 .};
 221
 222 .extern const struct bfd_iovec _bfd_memory_iovec;
 223
 224 */
 225
 226
 227 /* Return value is amount read.  */
 228
 229 bfd_size_type
 230 bfd_bread (void *ptr, bfd_size_type size, bfd *abfd)
 231 {
 232   file_ptr nread;
 233   bfd *element_bfd = abfd;
 234   ufile_ptr offset = 0;
 235
 236   while (abfd->my_archive != NULL
 237          && !bfd_is_thin_archive (abfd->my_archive))
 238     {
 239       offset += abfd->origin;
 240       abfd = abfd->my_archive;
 241     }
 242   offset += abfd->origin;
 243
 244   /* If this is a non-thin archive element, don't read past the end of
 245      this element.  */
 246   if (element_bfd->arelt_data != NULL
 247       && element_bfd->my_archive != NULL
 248       && !bfd_is_thin_archive (element_bfd->my_archive))
 249     {
 250       bfd_size_type maxbytes = arelt_size (element_bfd);
 251
 252       if (abfd->where < offset || abfd->where - offset >= maxbytes)
 253         {
 254           bfd_set_error (bfd_error_invalid_operation);
 255           return -1;
 256         }
 257       if (abfd->where - offset + size > maxbytes)
 258         size = maxbytes - (abfd->where - offset);
 259     }
 260
 261   if (abfd->iovec == NULL)
 262     {
 263       bfd_set_error (bfd_error_invalid_operation);
 264       return -1;
 265     }
 266
 267   nread = abfd->iovec->bread (abfd, ptr, size);
 268   if (nread != -1)
 269     abfd->where += nread;
 270
 271   return nread;
 272 }
 273
 274 bfd_size_type
 275 bfd_bwrite (const void *ptr, bfd_size_type size, bfd *abfd)
 276 {
 277   file_ptr nwrote;
 278
 279   while (abfd->my_archive != NULL
 280          && !bfd_is_thin_archive (abfd->my_archive))
 281     abfd = abfd->my_archive;
 282
 283   if (abfd->iovec == NULL)
 284     {
 285       bfd_set_error (bfd_error_invalid_operation);
 286       return -1;
 287     }
 288
 289   nwrote = abfd->iovec->bwrite (abfd, ptr, size);
 290   if (nwrote != -1)
 291     abfd->where += nwrote;
 292   if ((bfd_size_type) nwrote != size)
 293     {
 294 #ifdef ENOSPC
 295       errno = ENOSPC;
 296 #endif
 297       bfd_set_error (bfd_error_system_call);
 298     }
 299   return nwrote;
 300 }
 301
 302 file_ptr
 303 bfd_tell (bfd *abfd)
 304 {
 305   ufile_ptr offset = 0;
 306   file_ptr ptr;
 307
 308   while (abfd->my_archive != NULL
 309          && !bfd_is_thin_archive (abfd->my_archive))
 310     {
 311       offset += abfd->origin;
 312       abfd = abfd->my_archive;
 313     }
 314   offset += abfd->origin;
 315
 316   if (abfd->iovec == NULL)
 317     return 0;
 318
 319   ptr = abfd->iovec->btell (abfd);
 320   abfd->where = ptr;
 321   return ptr - offset;
 322 }
 323
 324 int
 325 bfd_flush (bfd *abfd)
 326 {
 327   while (abfd->my_archive != NULL
 328          && !bfd_is_thin_archive (abfd->my_archive))
 329     abfd = abfd->my_archive;
 330
 331   if (abfd->iovec == NULL)
 332     return 0;
 333
 334   return abfd->iovec->bflush (abfd);
 335 }
 336
 337 /* Returns 0 for success, negative value for failure (in which case
 338    bfd_get_error can retrieve the error code).  */
 339 int
 340 bfd_stat (bfd *abfd, struct stat *statbuf)
 341 {
 342   int result;
 343
 344   while (abfd->my_archive != NULL
 345          && !bfd_is_thin_archive (abfd->my_archive))
 346     abfd = abfd->my_archive;
 347
 348   if (abfd->iovec == NULL)
 349     {
 350       bfd_set_error (bfd_error_invalid_operation);
 351       return -1;
 352     }
 353
 354   result = abfd->iovec->bstat (abfd, statbuf);
 355   if (result < 0)
 356     bfd_set_error (bfd_error_system_call);
 357   return result;
 358 }
 359
 360 /* Returns 0 for success, nonzero for failure (in which case bfd_get_error
 361    can retrieve the error code).  */
 362
 363 int
 364 bfd_seek (bfd *abfd, file_ptr position, int direction)
 365 {
 366   int result;
 367   ufile_ptr offset = 0;
 368
 369   while (abfd->my_archive != NULL
 370          && !bfd_is_thin_archive (abfd->my_archive))
 371     {
 372       offset += abfd->origin;
 373       abfd = abfd->my_archive;
 374     }
 375   offset += abfd->origin;
 376
 377   if (abfd->iovec == NULL)
 378     {
 379       bfd_set_error (bfd_error_invalid_operation);
 380       return -1;
 381     }
 382
 383   /* For the time being, a BFD may not seek to it's end.  The problem
 384      is that we don't easily have a way to recognize the end of an
 385      element in an archive.  */
 386   BFD_ASSERT (direction == SEEK_SET || direction == SEEK_CUR);
 387
 388   if (direction != SEEK_CUR)
 389     position += offset;
 390
 391   if ((direction == SEEK_CUR && position == 0)
 392       || (direction == SEEK_SET && (ufile_ptr) position == abfd->where))
 393     return 0;
 394
 395   result = abfd->iovec->bseek (abfd, position, direction);
 396   if (result != 0)
 397     {
 398       /* An EINVAL error probably means that the file offset was
 399          absurd.  */
 400       if (errno == EINVAL)
 401         bfd_set_error (bfd_error_file_truncated);
 402       else
 403         bfd_set_error (bfd_error_system_call);
 404     }
 405   else
 406     {
 407       /* Adjust `where' field.  */
 408       if (direction == SEEK_CUR)
 409         abfd->where += position;
 410       else
 411         abfd->where = position;
 412     }
 413
 414   return result;
 415 }
 416
 417 /*
 418 FUNCTION
 419         bfd_get_mtime
 420
 421 SYNOPSIS
 422         long bfd_get_mtime (bfd *abfd);
 423
 424 DESCRIPTION
 425         Return the file modification time (as read from the file system, or
 426         from the archive header for archive members).
 427
 428 */
 429
 430 long
 431 bfd_get_mtime (bfd *abfd)
 432 {
 433   struct stat buf;
 434
 435   if (abfd->mtime_set)
 436     return abfd->mtime;
 437
 438   if (bfd_stat (abfd, &buf) != 0)
 439     return 0;
 440
 441   abfd->mtime = buf.st_mtime;           /* Save value in case anyone wants it */
 442   return buf.st_mtime;
 443 }
 444
 445 /*
 446 FUNCTION
 447         bfd_get_size
 448
 449 SYNOPSIS
 450         ufile_ptr bfd_get_size (bfd *abfd);
 451
 452 DESCRIPTION
 453         Return the file size (as read from file system) for the file
 454         associated with BFD @var{abfd}.
 455
 456         The initial motivation for, and use of, this routine is not
 457         so we can get the exact size of the object the BFD applies to, since
 458         that might not be generally possible (archive members for example).
 459         It would be ideal if someone could eventually modify
 460         it so that such results were guaranteed.
 461
 462         Instead, we want to ask questions like "is this NNN byte sized
 463         object I'm about to try read from file offset YYY reasonable?"
 464         As as example of where we might do this, some object formats
 465         use string tables for which the first <<sizeof (long)>> bytes of the
 466         table contain the size of the table itself, including the size bytes.
 467         If an application tries to read what it thinks is one of these
 468         string tables, without some way to validate the size, and for
 469         some reason the size is wrong (byte swapping error, wrong location
 470         for the string table, etc.), the only clue is likely to be a read
 471         error when it tries to read the table, or a "virtual memory
 472         exhausted" error when it tries to allocate 15 bazillon bytes
 473         of space for the 15 bazillon byte table it is about to read.
 474         This function at least allows us to answer the question, "is the
 475         size reasonable?".
 476
 477         A return value of zero indicates the file size is unknown.
 478 */
 479
 480 ufile_ptr
 481 bfd_get_size (bfd *abfd)
 482 {
 483   /* A size of 0 means we haven't yet called bfd_stat.  A size of 1
 484      means we have a cached value of 0, ie. unknown.  */
 485   if (abfd->size <= 1 || bfd_write_p (abfd))
 486     {
 487       struct stat buf;
 488
 489       if (abfd->size == 1 && !bfd_write_p (abfd))
 490         return 0;
 491
 492       if (bfd_stat (abfd, &buf) != 0
 493           || buf.st_size == 0
 494           || buf.st_size - (ufile_ptr) buf.st_size != 0)
 495         {
 496           abfd->size = 1;
 497           return 0;
 498         }
 499       abfd->size = buf.st_size;
 500     }
 501   return abfd->size;
 502 }
 503
 504 /*
 505 FUNCTION
 506         bfd_get_file_size
 507
 508 SYNOPSIS
 509         ufile_ptr bfd_get_file_size (bfd *abfd);
 510
 511 DESCRIPTION
 512         Return the file size (as read from file system) for the file
 513         associated with BFD @var{abfd}.  It supports both normal files
 514         and archive elements.
 515
 516 */
 517
 518 ufile_ptr
 519 bfd_get_file_size (bfd *abfd)
 520 {
 521   ufile_ptr file_size, archive_size = (ufile_ptr) -1;
 522
 523   if (abfd->my_archive != NULL
 524       && !bfd_is_thin_archive (abfd->my_archive))
 525     {
 526       struct areltdata *adata = (struct areltdata *) abfd->arelt_data;
 527       if (adata != NULL)
 528         {
 529           archive_size = adata->parsed_size;
 530           /* If the archive is compressed we can't compare against
 531              file size.  */
 532           if (adata->arch_header != NULL
 533               && memcmp (((struct ar_hdr *) adata->arch_header)->ar_fmag,
 534                          "Z\012", 2) == 0)
 535             return archive_size;
 536           abfd = abfd->my_archive;
 537         }
 538     }
 539
 540   file_size = bfd_get_size (abfd);
 541   if (archive_size < file_size)
 542     return archive_size;
 543   return file_size;
 544 }
 545
 546 /*
 547 FUNCTION
 548         bfd_mmap
 549
 550 SYNOPSIS
 551         void *bfd_mmap (bfd *abfd, void *addr, bfd_size_type len,
 552                         int prot, int flags, file_ptr offset,
 553                         void **map_addr, bfd_size_type *map_len);
 554
 555 DESCRIPTION
 556         Return mmap()ed region of the file, if possible and implemented.
 557         LEN and OFFSET do not need to be page aligned.  The page aligned
 558         address and length are written to MAP_ADDR and MAP_LEN.
 559
 560 */
 561
 562 void *
 563 bfd_mmap (bfd *abfd, void *addr, bfd_size_type len,
 564           int prot, int flags, file_ptr offset,
 565           void **map_addr, bfd_size_type *map_len)
 566 {
 567   while (abfd->my_archive != NULL
 568          && !bfd_is_thin_archive (abfd->my_archive))
 569     {
 570       offset += abfd->origin;
 571       abfd = abfd->my_archive;
 572     }
 573   offset += abfd->origin;
 574
 575   if (abfd->iovec == NULL)
 576     {
 577       bfd_set_error (bfd_error_invalid_operation);
 578       return (void *) -1;
 579     }
 580
 581   return abfd->iovec->bmmap (abfd, addr, len, prot, flags, offset,
 582                              map_addr, map_len);
 583 }
 584
 585 /* Memory file I/O operations.  */
 586
 587 static file_ptr
 588 memory_bread (bfd *abfd, void *ptr, file_ptr size)
 589 {
 590   struct bfd_in_memory *bim;
 591   bfd_size_type get;
 592
 593   bim = (struct bfd_in_memory *) abfd->iostream;
 594   get = size;
 595   if (abfd->where + get > bim->size)
 596     {
 597       if (bim->size < (bfd_size_type) abfd->where)
 598         get = 0;
 599       else
 600         get = bim->size - abfd->where;
 601       bfd_set_error (bfd_error_file_truncated);
 602     }
 603   memcpy (ptr, bim->buffer + abfd->where, (size_t) get);
 604   return get;
 605 }
 606
 607 static file_ptr
 608 memory_bwrite (bfd *abfd, const void *ptr, file_ptr size)
 609 {
 610   struct bfd_in_memory *bim = (struct bfd_in_memory *) abfd->iostream;
 611
 612   if (abfd->where + size > bim->size)
 613     {
 614       bfd_size_type newsize, oldsize;
 615
 616       oldsize = (bim->size + 127) & ~(bfd_size_type) 127;
 617       bim->size = abfd->where + size;
 618       /* Round up to cut down on memory fragmentation */
 619       newsize = (bim->size + 127) & ~(bfd_size_type) 127;
 620       if (newsize > oldsize)
 621         {
 622           bim->buffer = (bfd_byte *) bfd_realloc_or_free (bim->buffer, newsize);
 623           if (bim->buffer == NULL)
 624             {
 625               bim->size = 0;
 626               return 0;
 627             }
 628           if (newsize > bim->size)
 629             memset (bim->buffer + bim->size, 0, newsize - bim->size);
 630         }
 631     }
 632   memcpy (bim->buffer + abfd->where, ptr, (size_t) size);
 633   return size;
 634 }
 635
 636 static file_ptr
 637 memory_btell (bfd *abfd)
 638 {
 639   return abfd->where;
 640 }
 641
 642 static int
 643 memory_bseek (bfd *abfd, file_ptr position, int direction)
 644 {
 645   file_ptr nwhere;
 646   struct bfd_in_memory *bim;
 647
 648   bim = (struct bfd_in_memory *) abfd->iostream;
 649
 650   if (direction == SEEK_SET)
 651     nwhere = position;
 652   else
 653     nwhere = abfd->where + position;
 654
 655   if (nwhere < 0)
 656     {
 657       abfd->where = 0;
 658       errno = EINVAL;
 659       return -1;
 660     }
 661
 662   if ((bfd_size_type)nwhere > bim->size)
 663     {
 664       if (abfd->direction == write_direction
 665           || abfd->direction == both_direction)
 666         {
 667           bfd_size_type newsize, oldsize;
 668
 669           oldsize = (bim->size + 127) & ~(bfd_size_type) 127;
 670           bim->size = nwhere;
 671           /* Round up to cut down on memory fragmentation */
 672           newsize = (bim->size + 127) & ~(bfd_size_type) 127;
 673           if (newsize > oldsize)
 674             {
 675               bim->buffer = (bfd_byte *) bfd_realloc_or_free (bim->buffer, newsize);
 676               if (bim->buffer == NULL)
 677                 {
 678                   errno = EINVAL;
 679                   bim->size = 0;
 680                   return -1;
 681                 }
 682               memset (bim->buffer + oldsize, 0, newsize - oldsize);
 683             }
 684         }
 685       else
 686         {
 687           abfd->where = bim->size;
 688           errno = EINVAL;
 689           bfd_set_error (bfd_error_file_truncated);
 690           return -1;
 691         }
 692     }
 693   return 0;
 694 }
 695
 696 static int
 697 memory_bclose (struct bfd *abfd)
 698 {
 699   struct bfd_in_memory *bim = (struct bfd_in_memory *) abfd->iostream;
 700
 701   free (bim->buffer);
 702   free (bim);
 703   abfd->iostream = NULL;
 704
 705   return 0;
 706 }
 707
 708 static int
 709 memory_bflush (bfd *abfd ATTRIBUTE_UNUSED)
 710 {
 711   return 0;
 712 }
 713
 714 static int
 715 memory_bstat (bfd *abfd, struct stat *statbuf)
 716 {
 717   struct bfd_in_memory *bim = (struct bfd_in_memory *) abfd->iostream;
 718
 719   memset (statbuf, 0, sizeof (*statbuf));
 720   statbuf->st_size = bim->size;
 721
 722   return 0;
 723 }
 724
 725 static void *
 726 memory_bmmap (bfd *abfd ATTRIBUTE_UNUSED, void *addr ATTRIBUTE_UNUSED,
 727               bfd_size_type len ATTRIBUTE_UNUSED, int prot ATTRIBUTE_UNUSED,
 728               int flags ATTRIBUTE_UNUSED, file_ptr offset ATTRIBUTE_UNUSED,
 729               void **map_addr ATTRIBUTE_UNUSED,
 730               bfd_size_type *map_len ATTRIBUTE_UNUSED)
 731 {
 732   return (void *)-1;
 733 }
 734
 735 const struct bfd_iovec _bfd_memory_iovec =
 736 {
 737   &memory_bread, &memory_bwrite, &memory_btell, &memory_bseek,
 738   &memory_bclose, &memory_bflush, &memory_bstat, &memory_bmmap
 739 };