binutils/rescoff.c

   1 /* rescoff.c -- read and write resources in Windows COFF files.
   2    Copyright 1997, 1998, 1999, 2000, 2003, 2007, 2008
   3    Free Software Foundation, Inc.
   4    Written by Ian Lance Taylor, Cygnus Support.
   5    Rewritten by Kai Tietz, Onevision.
   6
   7    This file is part of GNU Binutils.
   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, MA
  22    02110-1301, USA.  */
  23
  24 /* This file contains function that read and write Windows resources
  25    in COFF files.  */
  26
  27 #include "sysdep.h"
  28 #include "bfd.h"
  29 #include "bucomm.h"
  30 #include "libiberty.h"
  31 #include "windres.h"
  32
  33 #include <assert.h>
  34
  35 /* In order to use the address of a resource data entry, we need to
  36    get the image base of the file.  Right now we extract it from
  37    internal BFD information.  FIXME.  */
  38
  39 #include "coff/internal.h"
  40 #include "libcoff.h"
  41
  42 /* Information we extract from the file.  */
  43
  44 struct coff_file_info
  45 {
  46   /* File name.  */
  47   const char *filename;
  48   /* Data read from the file.  */
  49   const bfd_byte *data;
  50   /* End of data read from file.  */
  51   const bfd_byte *data_end;
  52   /* Address of the resource section minus the image base of the file.  */
  53   rc_uint_type secaddr;
  54 };
  55
  56 /* A resource directory table in a COFF file.  */
  57
  58 struct __attribute__ ((__packed__)) extern_res_directory
  59 {
  60   /* Characteristics.  */
  61   bfd_byte characteristics[4];
  62   /* Time stamp.  */
  63   bfd_byte time[4];
  64   /* Major version number.  */
  65   bfd_byte major[2];
  66   /* Minor version number.  */
  67   bfd_byte minor[2];
  68   /* Number of named directory entries.  */
  69   bfd_byte name_count[2];
  70   /* Number of directory entries with IDs.  */
  71   bfd_byte id_count[2];
  72 };
  73
  74 /* A resource directory entry in a COFF file.  */
  75
  76 struct extern_res_entry
  77 {
  78   /* Name or ID.  */
  79   bfd_byte name[4];
  80   /* Address of resource entry or subdirectory.  */
  81   bfd_byte rva[4];
  82 };
  83
  84 /* A resource data entry in a COFF file.  */
  85
  86 struct extern_res_data
  87 {
  88   /* Address of resource data.  This is apparently a file relative
  89      address, rather than a section offset.  */
  90   bfd_byte rva[4];
  91   /* Size of resource data.  */
  92   bfd_byte size[4];
  93   /* Code page.  */
  94   bfd_byte codepage[4];
  95   /* Reserved.  */
  96   bfd_byte reserved[4];
  97 };
  98
  99 /* Local functions.  */
 100
 101 static void overrun (const struct coff_file_info *, const char *);
 102 static rc_res_directory *read_coff_res_dir (windres_bfd *, const bfd_byte *,
 103                                             const struct coff_file_info *,
 104                                             const rc_res_id *, int);
 105 static rc_res_resource *read_coff_data_entry (windres_bfd *, const bfd_byte *,
 106                                               const struct coff_file_info *,
 107                                               const rc_res_id *);
 108 \f
 109 /* Read the resources in a COFF file.  */
 110
 111 rc_res_directory *
 112 read_coff_rsrc (const char *filename, const char *target)
 113 {
 114   rc_res_directory *ret;
 115   bfd *abfd;
 116   windres_bfd wrbfd;
 117   char **matching;
 118   asection *sec;
 119   bfd_size_type size;
 120   bfd_byte *data;
 121   struct coff_file_info finfo;
 122
 123   if (filename == NULL)
 124     fatal (_("filename required for COFF input"));
 125
 126   abfd = bfd_openr (filename, target);
 127   if (abfd == NULL)
 128     bfd_fatal (filename);
 129
 130   if (! bfd_check_format_matches (abfd, bfd_object, &matching))
 131     {
 132       bfd_nonfatal (bfd_get_filename (abfd));
 133       if (bfd_get_error () == bfd_error_file_ambiguously_recognized)
 134         list_matching_formats (matching);
 135       xexit (1);
 136     }
 137
 138   sec = bfd_get_section_by_name (abfd, ".rsrc");
 139   if (sec == NULL)
 140     {
 141       fatal (_("%s: no resource section"), filename);
 142     }
 143
 144   set_windres_bfd (&wrbfd, abfd, sec, WR_KIND_BFD);
 145   size = bfd_section_size (abfd, sec);
 146   data = (bfd_byte *) res_alloc (size);
 147
 148   get_windres_bfd_content (&wrbfd, data, 0, size);
 149
 150   finfo.filename = filename;
 151   finfo.data = data;
 152   finfo.data_end = data + size;
 153   finfo.secaddr = (bfd_get_section_vma (abfd, sec)
 154                    - pe_data (abfd)->pe_opthdr.ImageBase);
 155
 156   /* Now just read in the top level resource directory.  Note that we
 157      don't free data, since we create resource entries that point into
 158      it.  If we ever want to free up the resource information we read,
 159      this will have to be cleaned up.  */
 160
 161   ret = read_coff_res_dir (&wrbfd, data, &finfo, (const rc_res_id *) NULL, 0);
 162
 163   bfd_close (abfd);
 164
 165   return ret;
 166 }
 167
 168 /* Give an error if we are out of bounds.  */
 169
 170 static void
 171 overrun (const struct coff_file_info *finfo, const char *msg)
 172 {
 173   fatal (_("%s: %s: address out of bounds"), finfo->filename, msg);
 174 }
 175
 176 /* Read a resource directory.  */
 177
 178 static rc_res_directory *
 179 read_coff_res_dir (windres_bfd *wrbfd, const bfd_byte *data,
 180                    const struct coff_file_info *finfo,
 181                    const rc_res_id *type, int level)
 182 {
 183   const struct extern_res_directory *erd;
 184   rc_res_directory *rd;
 185   int name_count, id_count, i;
 186   rc_res_entry **pp;
 187   const struct extern_res_entry *ere;
 188
 189   if ((size_t) (finfo->data_end - data) < sizeof (struct extern_res_directory))
 190     overrun (finfo, _("directory"));
 191
 192   erd = (const struct extern_res_directory *) data;
 193
 194   rd = (rc_res_directory *) res_alloc (sizeof (rc_res_directory));
 195   rd->characteristics = windres_get_32 (wrbfd, erd->characteristics, 4);
 196   rd->time = windres_get_32 (wrbfd, erd->time, 4);
 197   rd->major = windres_get_16 (wrbfd, erd->major, 2);
 198   rd->minor = windres_get_16 (wrbfd, erd->minor, 2);
 199   rd->entries = NULL;
 200
 201   name_count = windres_get_16 (wrbfd, erd->name_count, 2);
 202   id_count = windres_get_16 (wrbfd, erd->id_count, 2);
 203
 204   pp = &rd->entries;
 205
 206   /* The resource directory entries immediately follow the directory
 207      table.  */
 208   ere = (const struct extern_res_entry *) (erd + 1);
 209
 210   for (i = 0; i < name_count; i++, ere++)
 211     {
 212       rc_uint_type name, rva;
 213       rc_res_entry *re;
 214       const bfd_byte *ers;
 215       int length, j;
 216
 217       if ((const bfd_byte *) ere >= finfo->data_end)
 218         overrun (finfo, _("named directory entry"));
 219
 220       name = windres_get_32 (wrbfd, ere->name, 4);
 221       rva = windres_get_32 (wrbfd, ere->rva, 4);
 222
 223       /* For some reason the high bit in NAME is set.  */
 224       name &=~ 0x80000000;
 225
 226       if (name > (rc_uint_type) (finfo->data_end - finfo->data))
 227         overrun (finfo, _("directory entry name"));
 228
 229       ers = finfo->data + name;
 230
 231       re = (rc_res_entry *) res_alloc (sizeof *re);
 232       re->next = NULL;
 233       re->id.named = 1;
 234       length = windres_get_16 (wrbfd, ers, 2);
 235       re->id.u.n.length = length;
 236       re->id.u.n.name = (unichar *) res_alloc (length * sizeof (unichar));
 237       for (j = 0; j < length; j++)
 238         re->id.u.n.name[j] = windres_get_16 (wrbfd, ers + j * 2 + 2, 2);
 239
 240       if (level == 0)
 241         type = &re->id;
 242
 243       if ((rva & 0x80000000) != 0)
 244         {
 245           rva &=~ 0x80000000;
 246           if (rva >= (rc_uint_type) (finfo->data_end - finfo->data))
 247             overrun (finfo, _("named subdirectory"));
 248           re->subdir = 1;
 249           re->u.dir = read_coff_res_dir (wrbfd, finfo->data + rva, finfo, type,
 250                                          level + 1);
 251         }
 252       else
 253         {
 254           if (rva >= (rc_uint_type) (finfo->data_end - finfo->data))
 255             overrun (finfo, _("named resource"));
 256           re->subdir = 0;
 257           re->u.res = read_coff_data_entry (wrbfd, finfo->data + rva, finfo, type);
 258         }
 259
 260       *pp = re;
 261       pp = &re->next;
 262     }
 263
 264   for (i = 0; i < id_count; i++, ere++)
 265     {
 266       unsigned long name, rva;
 267       rc_res_entry *re;
 268
 269       if ((const bfd_byte *) ere >= finfo->data_end)
 270         overrun (finfo, _("ID directory entry"));
 271
 272       name = windres_get_32 (wrbfd, ere->name, 4);
 273       rva = windres_get_32 (wrbfd, ere->rva, 4);
 274
 275       re = (rc_res_entry *) res_alloc (sizeof *re);
 276       re->next = NULL;
 277       re->id.named = 0;
 278       re->id.u.id = name;
 279
 280       if (level == 0)
 281         type = &re->id;
 282
 283       if ((rva & 0x80000000) != 0)
 284         {
 285           rva &=~ 0x80000000;
 286           if (rva >= (rc_uint_type) (finfo->data_end - finfo->data))
 287             overrun (finfo, _("ID subdirectory"));
 288           re->subdir = 1;
 289           re->u.dir = read_coff_res_dir (wrbfd, finfo->data + rva, finfo, type,
 290                                          level + 1);
 291         }
 292       else
 293         {
 294           if (rva >= (rc_uint_type) (finfo->data_end - finfo->data))
 295             overrun (finfo, _("ID resource"));
 296           re->subdir = 0;
 297           re->u.res = read_coff_data_entry (wrbfd, finfo->data + rva, finfo, type);
 298         }
 299
 300       *pp = re;
 301       pp = &re->next;
 302     }
 303
 304   return rd;
 305 }
 306
 307 /* Read a resource data entry.  */
 308
 309 static rc_res_resource *
 310 read_coff_data_entry (windres_bfd *wrbfd, const bfd_byte *data,
 311                       const struct coff_file_info *finfo,
 312                       const rc_res_id *type)
 313 {
 314   const struct extern_res_data *erd;
 315   rc_res_resource *r;
 316   rc_uint_type size, rva;
 317   const bfd_byte *resdata;
 318
 319   if (type == NULL)
 320     fatal (_("resource type unknown"));
 321
 322   if ((size_t) (finfo->data_end - data) < sizeof (struct extern_res_data))
 323     overrun (finfo, _("data entry"));
 324
 325   erd = (const struct extern_res_data *) data;
 326
 327   size = windres_get_32 (wrbfd, erd->size, 4);
 328   rva = windres_get_32 (wrbfd, erd->rva, 4);
 329   if (rva < finfo->secaddr
 330       || rva - finfo->secaddr >= (rc_uint_type) (finfo->data_end - finfo->data))
 331     overrun (finfo, _("resource data"));
 332
 333   resdata = finfo->data + (rva - finfo->secaddr);
 334
 335   if (size > (rc_uint_type) (finfo->data_end - resdata))
 336     overrun (finfo, _("resource data size"));
 337
 338   r = bin_to_res (wrbfd, *type, resdata, size);
 339
 340   memset (&r->res_info, 0, sizeof (rc_res_res_info));
 341   r->coff_info.codepage = windres_get_32 (wrbfd, erd->codepage, 4);
 342   r->coff_info.reserved = windres_get_32 (wrbfd, erd->reserved, 4);
 343
 344   return r;
 345 }
 346 \f
 347 /* This structure is used to build a list of bindata structures.  */
 348
 349 struct bindata_build
 350 {
 351   /* The data.  */
 352   bindata *d;
 353   /* The last structure we have added to the list.  */
 354   bindata *last;
 355   /* The size of the list as a whole.  */
 356   unsigned long length;
 357 };
 358
 359 struct coff_res_data_build
 360 {
 361   /* The data.  */
 362   coff_res_data *d;
 363   /* The last structure we have added to the list.  */
 364   coff_res_data *last;
 365   /* The size of the list as a whole.  */
 366   unsigned long length;
 367 };
 368
 369 /* This structure keeps track of information as we build the directory
 370    tree.  */
 371
 372 struct coff_write_info
 373 {
 374   /* These fields are based on the BFD.  */
 375   /* The BFD itself.  */
 376   windres_bfd *wrbfd;
 377   /* Pointer to section symbol used to build RVA relocs.  */
 378   asymbol **sympp;
 379
 380   /* These fields are computed initially, and then not changed.  */
 381   /* Length of directory tables and entries.  */
 382   unsigned long dirsize;
 383   /* Length of directory entry strings.  */
 384   unsigned long dirstrsize;
 385   /* Length of resource data entries.  */
 386   unsigned long dataentsize;
 387
 388   /* These fields are updated as we add data.  */
 389   /* Directory tables and entries.  */
 390   struct bindata_build dirs;
 391   /* Directory entry strings.  */
 392   struct bindata_build dirstrs;
 393   /* Resource data entries.  */
 394   struct bindata_build dataents;
 395   /* Actual resource data.  */
 396   struct coff_res_data_build resources;
 397   /* Relocations.  */
 398   arelent **relocs;
 399   /* Number of relocations.  */
 400   unsigned int reloc_count;
 401 };
 402
 403 static void coff_bin_sizes (const rc_res_directory *, struct coff_write_info *);
 404 static bfd_byte *coff_alloc (struct bindata_build *, rc_uint_type);
 405 static void coff_to_bin
 406   (const rc_res_directory *, struct coff_write_info *);
 407 static void coff_res_to_bin
 408   (const rc_res_resource *, struct coff_write_info *);
 409
 410 /* Write resources to a COFF file.  RESOURCES should already be
 411    sorted.
 412
 413    Right now we always create a new file.  Someday we should also
 414    offer the ability to merge resources into an existing file.  This
 415    would require doing the basic work of objcopy, just modifying or
 416    adding the .rsrc section.  */
 417
 418 void
 419 write_coff_file (const char *filename, const char *target,
 420                  const rc_res_directory *resources)
 421 {
 422   bfd *abfd;
 423   asection *sec;
 424   struct coff_write_info cwi;
 425   windres_bfd wrbfd;
 426   bindata *d;
 427   coff_res_data *rd;
 428   unsigned long length, offset;
 429
 430   if (filename == NULL)
 431     fatal (_("filename required for COFF output"));
 432
 433   abfd = bfd_openw (filename, target);
 434   if (abfd == NULL)
 435     bfd_fatal (filename);
 436
 437   if (! bfd_set_format (abfd, bfd_object))
 438     bfd_fatal ("bfd_set_format");
 439
 440 #if defined DLLTOOL_SH
 441   if (! bfd_set_arch_mach (abfd, bfd_arch_sh, 0))
 442     bfd_fatal ("bfd_set_arch_mach(sh)");
 443 #elif defined DLLTOOL_MIPS
 444   if (! bfd_set_arch_mach (abfd, bfd_arch_mips, 0))
 445     bfd_fatal ("bfd_set_arch_mach(mips)");
 446 #elif defined DLLTOOL_ARM
 447   if (! bfd_set_arch_mach (abfd, bfd_arch_arm, 0))
 448     bfd_fatal ("bfd_set_arch_mach(arm)");
 449 #else
 450   /* FIXME: This is obviously i386 specific.  */
 451   if (! bfd_set_arch_mach (abfd, bfd_arch_i386, 0))
 452     bfd_fatal ("bfd_set_arch_mach(i386)");
 453 #endif
 454
 455   if (! bfd_set_file_flags (abfd, HAS_SYMS | HAS_RELOC))
 456     bfd_fatal ("bfd_set_file_flags");
 457
 458   sec = bfd_make_section_with_flags (abfd, ".rsrc",
 459                                      (SEC_HAS_CONTENTS | SEC_ALLOC
 460                                       | SEC_LOAD | SEC_DATA));
 461   if (sec == NULL)
 462     bfd_fatal ("bfd_make_section");
 463
 464   if (! bfd_set_symtab (abfd, sec->symbol_ptr_ptr, 1))
 465     bfd_fatal ("bfd_set_symtab");
 466
 467   /* Requiring this is probably a bug in BFD.  */
 468   sec->output_section = sec;
 469
 470   /* The order of data in the .rsrc section is
 471        resource directory tables and entries
 472        resource directory strings
 473        resource data entries
 474        actual resource data
 475
 476      We build these different types of data in different lists.  */
 477
 478   set_windres_bfd (&wrbfd, abfd, sec, WR_KIND_BFD);
 479
 480   cwi.wrbfd = &wrbfd;
 481   cwi.sympp = sec->symbol_ptr_ptr;
 482   cwi.dirsize = 0;
 483   cwi.dirstrsize = 0;
 484   cwi.dataentsize = 0;
 485   cwi.dirs.d = NULL;
 486   cwi.dirs.last = NULL;
 487   cwi.dirs.length = 0;
 488   cwi.dirstrs.d = NULL;
 489   cwi.dirstrs.last = NULL;
 490   cwi.dirstrs.length = 0;
 491   cwi.dataents.d = NULL;
 492   cwi.dataents.last = NULL;
 493   cwi.dataents.length = 0;
 494   cwi.resources.d = NULL;
 495   cwi.resources.last = NULL;
 496   cwi.resources.length = 0;
 497   cwi.relocs = NULL;
 498   cwi.reloc_count = 0;
 499
 500   /* Work out the sizes of the resource directory entries, so that we
 501      know the various offsets we will need.  */
 502   coff_bin_sizes (resources, &cwi);
 503
 504   /* Force the directory strings to be 32 bit aligned.  Every other
 505      structure is 32 bit aligned anyhow.  */
 506   cwi.dirstrsize = (cwi.dirstrsize + 3) &~ 3;
 507
 508   /* Actually convert the resources to binary.  */
 509   coff_to_bin (resources, &cwi);
 510
 511   /* Add another 2 bytes to the directory strings if needed for
 512      alignment.  */
 513   if ((cwi.dirstrs.length & 3) != 0)
 514     {
 515       bfd_byte *ex;
 516
 517       ex = coff_alloc (&cwi.dirstrs, 2);
 518       ex[0] = 0;
 519       ex[1] = 0;
 520     }
 521
 522   /* Make sure that the data we built came out to the same size as we
 523      calculated initially.  */
 524   assert (cwi.dirs.length == cwi.dirsize);
 525   assert (cwi.dirstrs.length == cwi.dirstrsize);
 526   assert (cwi.dataents.length == cwi.dataentsize);
 527
 528   length = (cwi.dirsize
 529             + cwi.dirstrsize
 530             + cwi.dataentsize
 531             + cwi.resources.length);
 532
 533   if (! bfd_set_section_size (abfd, sec, length))
 534     bfd_fatal ("bfd_set_section_size");
 535
 536   bfd_set_reloc (abfd, sec, cwi.relocs, cwi.reloc_count);
 537
 538   offset = 0;
 539   for (d = cwi.dirs.d; d != NULL; d = d->next)
 540     {
 541       if (! bfd_set_section_contents (abfd, sec, d->data, offset, d->length))
 542         bfd_fatal ("bfd_set_section_contents");
 543       offset += d->length;
 544     }
 545   for (d = cwi.dirstrs.d; d != NULL; d = d->next)
 546     {
 547       set_windres_bfd_content (&wrbfd, d->data, offset, d->length);
 548       offset += d->length;
 549     }
 550   for (d = cwi.dataents.d; d != NULL; d = d->next)
 551     {
 552       set_windres_bfd_content (&wrbfd, d->data, offset, d->length);
 553       offset += d->length;
 554     }
 555   for (rd = cwi.resources.d; rd != NULL; rd = rd->next)
 556     {
 557       res_to_bin (cwi.wrbfd, (rc_uint_type) offset, rd->res);
 558       offset += rd->length;
 559     }
 560
 561   assert (offset == length);
 562
 563   if (! bfd_close (abfd))
 564     bfd_fatal ("bfd_close");
 565
 566   /* We allocated the relocs array using malloc.  */
 567   free (cwi.relocs);
 568 }
 569
 570 /* Work out the sizes of the various fixed size resource directory
 571    entries.  This updates fields in CWI.  */
 572
 573 static void
 574 coff_bin_sizes (const rc_res_directory *resdir,
 575                 struct coff_write_info *cwi)
 576 {
 577   const rc_res_entry *re;
 578
 579   cwi->dirsize += sizeof (struct extern_res_directory);
 580
 581   for (re = resdir->entries; re != NULL; re = re->next)
 582     {
 583       cwi->dirsize += sizeof (struct extern_res_entry);
 584
 585       if (re->id.named)
 586         cwi->dirstrsize += re->id.u.n.length * 2 + 2;
 587
 588       if (re->subdir)
 589         coff_bin_sizes (re->u.dir, cwi);
 590       else
 591         cwi->dataentsize += sizeof (struct extern_res_data);
 592     }
 593 }
 594
 595 /* Allocate data for a particular list.  */
 596
 597 static bfd_byte *
 598 coff_alloc (struct bindata_build *bb, rc_uint_type size)
 599 {
 600   bindata *d;
 601
 602   d = (bindata *) reswr_alloc (sizeof (bindata));
 603
 604   d->next = NULL;
 605   d->data = (bfd_byte *) reswr_alloc (size);
 606   d->length = size;
 607
 608   if (bb->d == NULL)
 609     bb->d = d;
 610   else
 611     bb->last->next = d;
 612   bb->last = d;
 613   bb->length += size;
 614
 615   return d->data;
 616 }
 617
 618 /* Convert the resource directory RESDIR to binary.  */
 619
 620 static void
 621 coff_to_bin (const rc_res_directory *resdir, struct coff_write_info *cwi)
 622 {
 623   struct extern_res_directory *erd;
 624   int ci, cn;
 625   const rc_res_entry *e;
 626   struct extern_res_entry *ere;
 627
 628   /* Write out the directory table.  */
 629
 630   erd = ((struct extern_res_directory *)
 631          coff_alloc (&cwi->dirs, sizeof (*erd)));
 632
 633   windres_put_32 (cwi->wrbfd, erd->characteristics, resdir->characteristics);
 634   windres_put_32 (cwi->wrbfd, erd->time, resdir->time);
 635   windres_put_16 (cwi->wrbfd, erd->major, resdir->major);
 636   windres_put_16 (cwi->wrbfd, erd->minor, resdir->minor);
 637
 638   ci = 0;
 639   cn = 0;
 640   for (e = resdir->entries; e != NULL; e = e->next)
 641     {
 642       if (e->id.named)
 643         ++cn;
 644       else
 645         ++ci;
 646     }
 647
 648   windres_put_16 (cwi->wrbfd, erd->name_count, cn);
 649   windres_put_16 (cwi->wrbfd, erd->id_count, ci);
 650
 651   /* Write out the data entries.  Note that we allocate space for all
 652      the entries before writing them out.  That permits a recursive
 653      call to work correctly when writing out subdirectories.  */
 654
 655   ere = ((struct extern_res_entry *)
 656          coff_alloc (&cwi->dirs, (ci + cn) * sizeof (*ere)));
 657   for (e = resdir->entries; e != NULL; e = e->next, ere++)
 658     {
 659       if (! e->id.named)
 660         windres_put_32 (cwi->wrbfd, ere->name, e->id.u.id);
 661       else
 662         {
 663           bfd_byte *str;
 664           rc_uint_type i;
 665
 666           /* For some reason existing files seem to have the high bit
 667              set on the address of the name, although that is not
 668              documented.  */
 669           windres_put_32 (cwi->wrbfd, ere->name,
 670                      0x80000000 | (cwi->dirsize + cwi->dirstrs.length));
 671
 672           str = coff_alloc (&cwi->dirstrs, e->id.u.n.length * 2 + 2);
 673           windres_put_16 (cwi->wrbfd, str, e->id.u.n.length);
 674           for (i = 0; i < e->id.u.n.length; i++)
 675             windres_put_16 (cwi->wrbfd, str + (i + 1) * sizeof (unichar), e->id.u.n.name[i]);
 676         }
 677
 678       if (e->subdir)
 679         {
 680           windres_put_32 (cwi->wrbfd, ere->rva, 0x80000000 | cwi->dirs.length);
 681           coff_to_bin (e->u.dir, cwi);
 682         }
 683       else
 684         {
 685           windres_put_32 (cwi->wrbfd, ere->rva,
 686                      cwi->dirsize + cwi->dirstrsize + cwi->dataents.length);
 687
 688           coff_res_to_bin (e->u.res, cwi);
 689         }
 690     }
 691 }
 692
 693 /* Convert the resource RES to binary.  */
 694
 695 static void
 696 coff_res_to_bin (const rc_res_resource *res, struct coff_write_info *cwi)
 697 {
 698   arelent *r;
 699   struct extern_res_data *erd;
 700   coff_res_data *d;
 701
 702   /* For some reason, although every other address is a section
 703      offset, the address of the resource data itself is an RVA.  That
 704      means that we need to generate a relocation for it.  We allocate
 705      the relocs array using malloc so that we can use realloc.  FIXME:
 706      This relocation handling is correct for the i386, but probably
 707      not for any other target.  */
 708
 709   r = (arelent *) reswr_alloc (sizeof (arelent));
 710   r->sym_ptr_ptr = cwi->sympp;
 711   r->address = cwi->dirsize + cwi->dirstrsize + cwi->dataents.length;
 712   r->addend = 0;
 713   r->howto = bfd_reloc_type_lookup (WR_BFD (cwi->wrbfd), BFD_RELOC_RVA);
 714   if (r->howto == NULL)
 715     bfd_fatal (_("can't get BFD_RELOC_RVA relocation type"));
 716
 717   cwi->relocs = xrealloc (cwi->relocs,
 718                           (cwi->reloc_count + 2) * sizeof (arelent *));
 719   cwi->relocs[cwi->reloc_count] = r;
 720   cwi->relocs[cwi->reloc_count + 1] = NULL;
 721   ++cwi->reloc_count;
 722
 723   erd = (struct extern_res_data *) coff_alloc (&cwi->dataents, sizeof (*erd));
 724
 725   windres_put_32 (cwi->wrbfd, erd->rva,
 726              (cwi->dirsize
 727               + cwi->dirstrsize
 728               + cwi->dataentsize
 729               + cwi->resources.length));
 730   windres_put_32 (cwi->wrbfd, erd->codepage, res->coff_info.codepage);
 731   windres_put_32 (cwi->wrbfd, erd->reserved, res->coff_info.reserved);
 732
 733   d = (coff_res_data *) reswr_alloc (sizeof (coff_res_data));
 734   d->length = res_to_bin (NULL, (rc_uint_type) 0, res);
 735   d->res = res;
 736   d->next = NULL;
 737
 738   if (cwi->resources.d == NULL)
 739     cwi->resources.d = d;
 740   else
 741     cwi->resources.last->next = d;
 742
 743   cwi->resources.last = d;
 744   cwi->resources.length += (d->length + 3) & ~3;
 745
 746   windres_put_32 (cwi->wrbfd, erd->size, d->length);
 747
 748   /* Force the next resource to have 32 bit alignment.  */
 749   d->length = (d->length + 3) & ~3;
 750 }