binutils/rescoff.c

   1 /* rescoff.c -- read and write resources in Windows COFF files.
   2    Copyright 1997, 1998, 1999, 2000, 2003
   3    Free Software Foundation, Inc.
   4    Written by Ian Lance Taylor, Cygnus Support.
   5
   6    This file is part of GNU Binutils.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  21    02111-1307, USA.  */
  22
  23 /* This file contains function that read and write Windows resources
  24    in COFF files.  */
  25
  26 #include "bfd.h"
  27 #include "bucomm.h"
  28 #include "libiberty.h"
  29 #include "windres.h"
  30
  31 #include <assert.h>
  32
  33 /* In order to use the address of a resource data entry, we need to
  34    get the image base of the file.  Right now we extract it from
  35    internal BFD information.  FIXME.  */
  36
  37 #include "coff/internal.h"
  38 #include "libcoff.h"
  39
  40 /* Information we extract from the file.  */
  41
  42 struct coff_file_info
  43 {
  44   /* File name.  */
  45   const char *filename;
  46   /* Data read from the file.  */
  47   const bfd_byte *data;
  48   /* End of data read from file.  */
  49   const bfd_byte *data_end;
  50   /* Address of the resource section minus the image base of the file.  */
  51   bfd_vma secaddr;
  52   /* Non-zero if the file is big endian.  */
  53   int big_endian;
  54 };
  55
  56 /* A resource directory table in a COFF file.  */
  57
  58 struct 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 /* Macros to swap in values.  */
 100
 101 #define getfi_16(fi, s) ((fi)->big_endian ? bfd_getb16 (s) : bfd_getl16 (s))
 102 #define getfi_32(fi, s) ((fi)->big_endian ? bfd_getb32 (s) : bfd_getl32 (s))
 103
 104 /* Local functions.  */
 105
 106 static void overrun (const struct coff_file_info *, const char *);
 107 static struct res_directory *read_coff_res_dir
 108   (const bfd_byte *, const struct coff_file_info *,
 109    const struct res_id *, int);
 110 static struct res_resource *read_coff_data_entry
 111   (const bfd_byte *, const struct coff_file_info *, const struct res_id *);
 112 \f
 113 /* Read the resources in a COFF file.  */
 114
 115 struct res_directory *
 116 read_coff_rsrc (const char *filename, const char *target)
 117 {
 118   bfd *abfd;
 119   char **matching;
 120   asection *sec;
 121   bfd_size_type size;
 122   bfd_byte *data;
 123   struct coff_file_info finfo;
 124
 125   if (filename == NULL)
 126     fatal (_("filename required for COFF input"));
 127
 128   abfd = bfd_openr (filename, target);
 129   if (abfd == NULL)
 130     bfd_fatal (filename);
 131
 132   if (! bfd_check_format_matches (abfd, bfd_object, &matching))
 133     {
 134       bfd_nonfatal (bfd_get_filename (abfd));
 135       if (bfd_get_error () == bfd_error_file_ambiguously_recognized)
 136         list_matching_formats (matching);
 137       xexit (1);
 138     }
 139
 140   sec = bfd_get_section_by_name (abfd, ".rsrc");
 141   if (sec == NULL)
 142     {
 143       fatal (_("%s: no resource section"), filename);
 144     }
 145
 146   size = bfd_section_size (abfd, sec);
 147   data = (bfd_byte *) res_alloc (size);
 148
 149   if (! bfd_get_section_contents (abfd, sec, data, 0, size))
 150     bfd_fatal (_("can't read resource section"));
 151
 152   finfo.filename = filename;
 153   finfo.data = data;
 154   finfo.data_end = data + size;
 155   finfo.secaddr = (bfd_get_section_vma (abfd, sec)
 156                    - pe_data (abfd)->pe_opthdr.ImageBase);
 157   finfo.big_endian = bfd_big_endian (abfd);
 158
 159   bfd_close (abfd);
 160
 161   /* Now just read in the top level resource directory.  Note that we
 162      don't free data, since we create resource entries that point into
 163      it.  If we ever want to free up the resource information we read,
 164      this will have to be cleaned up.  */
 165
 166   return read_coff_res_dir (data, &finfo, (const struct res_id *) NULL, 0);
 167 }
 168
 169 /* Give an error if we are out of bounds.  */
 170
 171 static void
 172 overrun (const struct coff_file_info *finfo, const char *msg)
 173 {
 174   fatal (_("%s: %s: address out of bounds"), finfo->filename, msg);
 175 }
 176
 177 /* Read a resource directory.  */
 178
 179 static struct res_directory *
 180 read_coff_res_dir (const bfd_byte *data, const struct coff_file_info *finfo,
 181                    const struct res_id *type, int level)
 182 {
 183   const struct extern_res_directory *erd;
 184   struct res_directory *rd;
 185   int name_count, id_count, i;
 186   struct 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 = (struct res_directory *) res_alloc (sizeof *rd);
 195   rd->characteristics = getfi_32 (finfo, erd->characteristics);
 196   rd->time = getfi_32 (finfo, erd->time);
 197   rd->major = getfi_16 (finfo, erd->major);
 198   rd->minor = getfi_16 (finfo, erd->minor);
 199   rd->entries = NULL;
 200
 201   name_count = getfi_16 (finfo, erd->name_count);
 202   id_count = getfi_16 (finfo, erd->id_count);
 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       unsigned long name, rva;
 213       struct 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 = getfi_32 (finfo, ere->name);
 221       rva = getfi_32 (finfo, ere->rva);
 222
 223       /* For some reason the high bit in NAME is set.  */
 224       name &=~ 0x80000000;
 225
 226       if (name > (size_t) (finfo->data_end - finfo->data))
 227         overrun (finfo, _("directory entry name"));
 228
 229       ers = finfo->data + name;
 230
 231       re = (struct res_entry *) res_alloc (sizeof *re);
 232       re->next = NULL;
 233       re->id.named = 1;
 234       length = getfi_16 (finfo, ers);
 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] = getfi_16 (finfo, ers + j * 2 + 2);
 239
 240       if (level == 0)
 241         type = &re->id;
 242
 243       if ((rva & 0x80000000) != 0)
 244         {
 245           rva &=~ 0x80000000;
 246           if (rva >= (size_t) (finfo->data_end - finfo->data))
 247             overrun (finfo, _("named subdirectory"));
 248           re->subdir = 1;
 249           re->u.dir = read_coff_res_dir (finfo->data + rva, finfo, type,
 250                                          level + 1);
 251         }
 252       else
 253         {
 254           if (rva >= (size_t) (finfo->data_end - finfo->data))
 255             overrun (finfo, _("named resource"));
 256           re->subdir = 0;
 257           re->u.res = read_coff_data_entry (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       struct res_entry *re;
 268
 269       if ((const bfd_byte *) ere >= finfo->data_end)
 270         overrun (finfo, _("ID directory entry"));
 271
 272       name = getfi_32 (finfo, ere->name);
 273       rva = getfi_32 (finfo, ere->rva);
 274
 275       re = (struct 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 >= (size_t) (finfo->data_end - finfo->data))
 287             overrun (finfo, _("ID subdirectory"));
 288           re->subdir = 1;
 289           re->u.dir = read_coff_res_dir (finfo->data + rva, finfo, type,
 290                                          level + 1);
 291         }
 292       else
 293         {
 294           if (rva >= (size_t) (finfo->data_end - finfo->data))
 295             overrun (finfo, _("ID resource"));
 296           re->subdir = 0;
 297           re->u.res = read_coff_data_entry (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 struct res_resource *
 310 read_coff_data_entry (const bfd_byte *data, const struct coff_file_info *finfo, const struct res_id *type)
 311 {
 312   const struct extern_res_data *erd;
 313   struct res_resource *r;
 314   unsigned long size, rva;
 315   const bfd_byte *resdata;
 316
 317   if (type == NULL)
 318     fatal (_("resource type unknown"));
 319
 320   if ((size_t) (finfo->data_end - data) < sizeof (struct extern_res_data))
 321     overrun (finfo, _("data entry"));
 322
 323   erd = (const struct extern_res_data *) data;
 324
 325   size = getfi_32 (finfo, erd->size);
 326   rva = getfi_32 (finfo, erd->rva);
 327   if (rva < finfo->secaddr
 328       || rva - finfo->secaddr >= (size_t) (finfo->data_end - finfo->data))
 329     overrun (finfo, _("resource data"));
 330
 331   resdata = finfo->data + (rva - finfo->secaddr);
 332
 333   if (size > (size_t) (finfo->data_end - resdata))
 334     overrun (finfo, _("resource data size"));
 335
 336   r = bin_to_res (*type, resdata, size, finfo->big_endian);
 337
 338   memset (&r->res_info, 0, sizeof (struct res_res_info));
 339   r->coff_info.codepage = getfi_32 (finfo, erd->codepage);
 340   r->coff_info.reserved = getfi_32 (finfo, erd->reserved);
 341
 342   return r;
 343 }
 344 \f
 345 /* This structure is used to build a list of bindata structures.  */
 346
 347 struct bindata_build
 348 {
 349   /* The data.  */
 350   struct bindata *d;
 351   /* The last structure we have added to the list.  */
 352   struct bindata *last;
 353   /* The size of the list as a whole.  */
 354   unsigned long length;
 355 };
 356
 357 /* This structure keeps track of information as we build the directory
 358    tree.  */
 359
 360 struct coff_write_info
 361 {
 362   /* These fields are based on the BFD.  */
 363   /* The BFD itself.  */
 364   bfd *abfd;
 365   /* Non-zero if the file is big endian.  */
 366   int big_endian;
 367   /* Pointer to section symbol used to build RVA relocs.  */
 368   asymbol **sympp;
 369
 370   /* These fields are computed initially, and then not changed.  */
 371   /* Length of directory tables and entries.  */
 372   unsigned long dirsize;
 373   /* Length of directory entry strings.  */
 374   unsigned long dirstrsize;
 375   /* Length of resource data entries.  */
 376   unsigned long dataentsize;
 377
 378   /* These fields are updated as we add data.  */
 379   /* Directory tables and entries.  */
 380   struct bindata_build dirs;
 381   /* Directory entry strings.  */
 382   struct bindata_build dirstrs;
 383   /* Resource data entries.  */
 384   struct bindata_build dataents;
 385   /* Actual resource data.  */
 386   struct bindata_build resources;
 387   /* Relocations.  */
 388   arelent **relocs;
 389   /* Number of relocations.  */
 390   unsigned int reloc_count;
 391 };
 392
 393 /* Macros to swap out values.  */
 394
 395 #define putcwi_16(cwi, v, s) \
 396   ((cwi->big_endian) ? bfd_putb16 ((v), (s)) : bfd_putl16 ((v), (s)))
 397 #define putcwi_32(cwi, v, s) \
 398   ((cwi->big_endian) ? bfd_putb32 ((v), (s)) : bfd_putl32 ((v), (s)))
 399
 400 static void coff_bin_sizes
 401   (const struct res_directory *, struct coff_write_info *);
 402 static unsigned char *coff_alloc (struct bindata_build *, size_t);
 403 static void coff_to_bin
 404   (const struct res_directory *, struct coff_write_info *);
 405 static void coff_res_to_bin
 406   (const struct res_resource *, struct coff_write_info *);
 407
 408 /* Write resources to a COFF file.  RESOURCES should already be
 409    sorted.
 410
 411    Right now we always create a new file.  Someday we should also
 412    offer the ability to merge resources into an existing file.  This
 413    would require doing the basic work of objcopy, just modifying or
 414    adding the .rsrc section.  */
 415
 416 void
 417 write_coff_file (const char *filename, const char *target,
 418                  const struct res_directory *resources)
 419 {
 420   bfd *abfd;
 421   asection *sec;
 422   struct coff_write_info cwi;
 423   struct bindata *d;
 424   unsigned long length, offset;
 425
 426   if (filename == NULL)
 427     fatal (_("filename required for COFF output"));
 428
 429   abfd = bfd_openw (filename, target);
 430   if (abfd == NULL)
 431     bfd_fatal (filename);
 432
 433   if (! bfd_set_format (abfd, bfd_object))
 434     bfd_fatal ("bfd_set_format");
 435
 436 #if defined DLLTOOL_SH
 437   if (! bfd_set_arch_mach (abfd, bfd_arch_sh, 0))
 438     bfd_fatal ("bfd_set_arch_mach(sh)");
 439 #elif defined DLLTOOL_MIPS
 440   if (! bfd_set_arch_mach (abfd, bfd_arch_mips, 0))
 441     bfd_fatal ("bfd_set_arch_mach(mips)");
 442 #elif defined DLLTOOL_ARM
 443   if (! bfd_set_arch_mach (abfd, bfd_arch_arm, 0))
 444     bfd_fatal ("bfd_set_arch_mach(arm)");
 445 #else
 446   /* FIXME: This is obviously i386 specific.  */
 447   if (! bfd_set_arch_mach (abfd, bfd_arch_i386, 0))
 448     bfd_fatal ("bfd_set_arch_mach(i386)");
 449 #endif
 450
 451   if (! bfd_set_file_flags (abfd, HAS_SYMS | HAS_RELOC))
 452     bfd_fatal ("bfd_set_file_flags");
 453
 454   sec = bfd_make_section (abfd, ".rsrc");
 455   if (sec == NULL)
 456     bfd_fatal ("bfd_make_section");
 457
 458   if (! bfd_set_section_flags (abfd, sec,
 459                                (SEC_HAS_CONTENTS | SEC_ALLOC
 460                                 | SEC_LOAD | SEC_DATA)))
 461     bfd_fatal ("bfd_set_section_flags");
 462
 463   if (! bfd_set_symtab (abfd, sec->symbol_ptr_ptr, 1))
 464     bfd_fatal ("bfd_set_symtab");
 465
 466   /* Requiring this is probably a bug in BFD.  */
 467   sec->output_section = sec;
 468
 469   /* The order of data in the .rsrc section is
 470        resource directory tables and entries
 471        resource directory strings
 472        resource data entries
 473        actual resource data
 474
 475      We build these different types of data in different lists.  */
 476
 477   cwi.abfd = abfd;
 478   cwi.big_endian = bfd_big_endian (abfd);
 479   cwi.sympp = sec->symbol_ptr_ptr;
 480   cwi.dirsize = 0;
 481   cwi.dirstrsize = 0;
 482   cwi.dataentsize = 0;
 483   cwi.dirs.d = NULL;
 484   cwi.dirs.last = NULL;
 485   cwi.dirs.length = 0;
 486   cwi.dirstrs.d = NULL;
 487   cwi.dirstrs.last = NULL;
 488   cwi.dirstrs.length = 0;
 489   cwi.dataents.d = NULL;
 490   cwi.dataents.last = NULL;
 491   cwi.dataents.length = 0;
 492   cwi.resources.d = NULL;
 493   cwi.resources.last = NULL;
 494   cwi.resources.length = 0;
 495   cwi.relocs = NULL;
 496   cwi.reloc_count = 0;
 497
 498   /* Work out the sizes of the resource directory entries, so that we
 499      know the various offsets we will need.  */
 500   coff_bin_sizes (resources, &cwi);
 501
 502   /* Force the directory strings to be 32 bit aligned.  Every other
 503      structure is 32 bit aligned anyhow.  */
 504   cwi.dirstrsize = (cwi.dirstrsize + 3) &~ 3;
 505
 506   /* Actually convert the resources to binary.  */
 507   coff_to_bin (resources, &cwi);
 508
 509   /* Add another 2 bytes to the directory strings if needed for
 510      alignment.  */
 511   if ((cwi.dirstrs.length & 3) != 0)
 512     {
 513       unsigned char *ex;
 514
 515       ex = coff_alloc (&cwi.dirstrs, 2);
 516       ex[0] = 0;
 517       ex[1] = 0;
 518     }
 519
 520   /* Make sure that the data we built came out to the same size as we
 521      calculated initially.  */
 522   assert (cwi.dirs.length == cwi.dirsize);
 523   assert (cwi.dirstrs.length == cwi.dirstrsize);
 524   assert (cwi.dataents.length == cwi.dataentsize);
 525
 526   length = (cwi.dirsize
 527             + cwi.dirstrsize
 528             + cwi.dataentsize
 529             + cwi.resources.length);
 530
 531   if (! bfd_set_section_size (abfd, sec, length))
 532     bfd_fatal ("bfd_set_section_size");
 533
 534   bfd_set_reloc (abfd, sec, cwi.relocs, cwi.reloc_count);
 535
 536   offset = 0;
 537   for (d = cwi.dirs.d; d != NULL; d = d->next)
 538     {
 539       if (! bfd_set_section_contents (abfd, sec, d->data, offset, d->length))
 540         bfd_fatal ("bfd_set_section_contents");
 541       offset += d->length;
 542     }
 543   for (d = cwi.dirstrs.d; d != NULL; d = d->next)
 544     {
 545       if (! bfd_set_section_contents (abfd, sec, d->data, offset, d->length))
 546         bfd_fatal ("bfd_set_section_contents");
 547       offset += d->length;
 548     }
 549   for (d = cwi.dataents.d; d != NULL; d = d->next)
 550     {
 551       if (! bfd_set_section_contents (abfd, sec, d->data, offset, d->length))
 552         bfd_fatal ("bfd_set_section_contents");
 553       offset += d->length;
 554     }
 555   for (d = cwi.resources.d; d != NULL; d = d->next)
 556     {
 557       if (! bfd_set_section_contents (abfd, sec, d->data, offset, d->length))
 558         bfd_fatal ("bfd_set_section_contents");
 559       offset += d->length;
 560     }
 561
 562   assert (offset == length);
 563
 564   if (! bfd_close (abfd))
 565     bfd_fatal ("bfd_close");
 566
 567   /* We allocated the relocs array using malloc.  */
 568   free (cwi.relocs);
 569 }
 570
 571 /* Work out the sizes of the various fixed size resource directory
 572    entries.  This updates fields in CWI.  */
 573
 574 static void
 575 coff_bin_sizes (const struct res_directory *resdir,
 576                 struct coff_write_info *cwi)
 577 {
 578   const struct res_entry *re;
 579
 580   cwi->dirsize += sizeof (struct extern_res_directory);
 581
 582   for (re = resdir->entries; re != NULL; re = re->next)
 583     {
 584       cwi->dirsize += sizeof (struct extern_res_entry);
 585
 586       if (re->id.named)
 587         cwi->dirstrsize += re->id.u.n.length * 2 + 2;
 588
 589       if (re->subdir)
 590         coff_bin_sizes (re->u.dir, cwi);
 591       else
 592         cwi->dataentsize += sizeof (struct extern_res_data);
 593     }
 594 }
 595
 596 /* Allocate data for a particular list.  */
 597
 598 static unsigned char *
 599 coff_alloc (struct bindata_build *bb, size_t size)
 600 {
 601   struct bindata *d;
 602
 603   d = (struct bindata *) reswr_alloc (sizeof *d);
 604
 605   d->next = NULL;
 606   d->data = (unsigned char *) reswr_alloc (size);
 607   d->length = size;
 608
 609   if (bb->d == NULL)
 610     bb->d = d;
 611   else
 612     bb->last->next = d;
 613   bb->last = d;
 614   bb->length += size;
 615
 616   return d->data;
 617 }
 618
 619 /* Convert the resource directory RESDIR to binary.  */
 620
 621 static void
 622 coff_to_bin (const struct res_directory *resdir, struct coff_write_info *cwi)
 623 {
 624   struct extern_res_directory *erd;
 625   int ci, cn;
 626   const struct res_entry *e;
 627   struct extern_res_entry *ere;
 628
 629   /* Write out the directory table.  */
 630
 631   erd = ((struct extern_res_directory *)
 632          coff_alloc (&cwi->dirs, sizeof (*erd)));
 633
 634   putcwi_32 (cwi, resdir->characteristics, erd->characteristics);
 635   putcwi_32 (cwi, resdir->time, erd->time);
 636   putcwi_16 (cwi, resdir->major, erd->major);
 637   putcwi_16 (cwi, resdir->minor, erd->minor);
 638
 639   ci = 0;
 640   cn = 0;
 641   for (e = resdir->entries; e != NULL; e = e->next)
 642     {
 643       if (e->id.named)
 644         ++cn;
 645       else
 646         ++ci;
 647     }
 648
 649   putcwi_16 (cwi, cn, erd->name_count);
 650   putcwi_16 (cwi, ci, erd->id_count);
 651
 652   /* Write out the data entries.  Note that we allocate space for all
 653      the entries before writing them out.  That permits a recursive
 654      call to work correctly when writing out subdirectories.  */
 655
 656   ere = ((struct extern_res_entry *)
 657          coff_alloc (&cwi->dirs, (ci + cn) * sizeof (*ere)));
 658   for (e = resdir->entries; e != NULL; e = e->next, ere++)
 659     {
 660       if (! e->id.named)
 661         putcwi_32 (cwi, e->id.u.id, ere->name);
 662       else
 663         {
 664           unsigned char *str;
 665           int i;
 666
 667           /* For some reason existing files seem to have the high bit
 668              set on the address of the name, although that is not
 669              documented.  */
 670           putcwi_32 (cwi,
 671                      0x80000000 | (cwi->dirsize + cwi->dirstrs.length),
 672                      ere->name);
 673
 674           str = coff_alloc (&cwi->dirstrs, e->id.u.n.length * 2 + 2);
 675           putcwi_16 (cwi, e->id.u.n.length, str);
 676           for (i = 0; i < e->id.u.n.length; i++)
 677             putcwi_16 (cwi, e->id.u.n.name[i], str + i * 2 + 2);
 678         }
 679
 680       if (e->subdir)
 681         {
 682           putcwi_32 (cwi, 0x80000000 | cwi->dirs.length, ere->rva);
 683           coff_to_bin (e->u.dir, cwi);
 684         }
 685       else
 686         {
 687           putcwi_32 (cwi,
 688                      cwi->dirsize + cwi->dirstrsize + cwi->dataents.length,
 689                      ere->rva);
 690
 691           coff_res_to_bin (e->u.res, cwi);
 692         }
 693     }
 694 }
 695
 696 /* Convert the resource RES to binary.  */
 697
 698 static void
 699 coff_res_to_bin (const struct res_resource *res, struct coff_write_info *cwi)
 700 {
 701   arelent *r;
 702   struct extern_res_data *erd;
 703   struct bindata *d;
 704   unsigned long length;
 705
 706   /* For some reason, although every other address is a section
 707      offset, the address of the resource data itself is an RVA.  That
 708      means that we need to generate a relocation for it.  We allocate
 709      the relocs array using malloc so that we can use realloc.  FIXME:
 710      This relocation handling is correct for the i386, but probably
 711      not for any other target.  */
 712
 713   r = (arelent *) reswr_alloc (sizeof (arelent));
 714   r->sym_ptr_ptr = cwi->sympp;
 715   r->address = cwi->dirsize + cwi->dirstrsize + cwi->dataents.length;
 716   r->addend = 0;
 717   r->howto = bfd_reloc_type_lookup (cwi->abfd, BFD_RELOC_RVA);
 718   if (r->howto == NULL)
 719     bfd_fatal (_("can't get BFD_RELOC_RVA relocation type"));
 720
 721   cwi->relocs = xrealloc (cwi->relocs,
 722                           (cwi->reloc_count + 2) * sizeof (arelent *));
 723   cwi->relocs[cwi->reloc_count] = r;
 724   cwi->relocs[cwi->reloc_count + 1] = NULL;
 725   ++cwi->reloc_count;
 726
 727   erd = (struct extern_res_data *) coff_alloc (&cwi->dataents, sizeof (*erd));
 728
 729   putcwi_32 (cwi,
 730              (cwi->dirsize
 731               + cwi->dirstrsize
 732               + cwi->dataentsize
 733               + cwi->resources.length),
 734              erd->rva);
 735   putcwi_32 (cwi, res->coff_info.codepage, erd->codepage);
 736   putcwi_32 (cwi, res->coff_info.reserved, erd->reserved);
 737
 738   d = res_to_bin (res, cwi->big_endian);
 739
 740   if (cwi->resources.d == NULL)
 741     cwi->resources.d = d;
 742   else
 743     cwi->resources.last->next = d;
 744
 745   length = 0;
 746   for (; d->next != NULL; d = d->next)
 747     length += d->length;
 748   length += d->length;
 749   cwi->resources.last = d;
 750   cwi->resources.length += length;
 751
 752   putcwi_32 (cwi, length, erd->size);
 753
 754   /* Force the next resource to have 32 bit alignment.  */
 755
 756   if ((length & 3) != 0)
 757     {
 758       int add;
 759       unsigned char *ex;
 760
 761       add = 4 - (length & 3);
 762
 763       ex = coff_alloc (&cwi->resources, add);
 764       memset (ex, 0, add);
 765     }
 766 }