binutils/rescoff.c

   1 /* rescoff.c -- read and write resources in Windows COFF files.
   2    Copyright 1997, 1998 Free Software Foundation, Inc.
   3    Written by Ian Lance Taylor, Cygnus Support.
   4
   5    This file is part of GNU Binutils.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  20    02111-1307, USA.  */
  21
  22 /* This file contains function that read and write Windows resources
  23    in COFF files.  */
  24
  25 #include "bfd.h"
  26 #include "bucomm.h"
  27 #include "libiberty.h"
  28 #include "windres.h"
  29
  30 #include <assert.h>
  31
  32 /* In order to use the address of a resource data entry, we need to
  33    get the image base of the file.  Right now we extract it from
  34    internal BFD information.  FIXME.  */
  35
  36 #include "coff/internal.h"
  37 #include "libcoff.h"
  38
  39 /* Information we extract from the file.  */
  40
  41 struct coff_file_info
  42 {
  43   /* File name.  */
  44   const char *filename;
  45   /* Data read from the file.  */
  46   const bfd_byte *data;
  47   /* End of data read from file.  */
  48   const bfd_byte *data_end;
  49   /* Address of the resource section minus the image base of the file.  */
  50   bfd_vma secaddr;
  51   /* Non-zero if the file is big endian.  */
  52   int big_endian;
  53 };
  54
  55 /* A resource directory table in a COFF file.  */
  56
  57 struct extern_res_directory
  58 {
  59   /* Characteristics.  */
  60   bfd_byte characteristics[4];
  61   /* Time stamp.  */
  62   bfd_byte time[4];
  63   /* Major version number.  */
  64   bfd_byte major[2];
  65   /* Minor version number.  */
  66   bfd_byte minor[2];
  67   /* Number of named directory entries.  */
  68   bfd_byte name_count[2];
  69   /* Number of directory entries with IDs.  */
  70   bfd_byte id_count[2];
  71 };
  72
  73 /* A resource directory entry in a COFF file.  */
  74
  75 struct extern_res_entry
  76 {
  77   /* Name or ID.  */
  78   bfd_byte name[4];
  79   /* Address of resource entry or subdirectory.  */
  80   bfd_byte rva[4];
  81 };
  82
  83 /* A resource data entry in a COFF file.  */
  84
  85 struct extern_res_data
  86 {
  87   /* Address of resource data.  This is apparently a file relative
  88      address, rather than a section offset.  */
  89   bfd_byte rva[4];
  90   /* Size of resource data.  */
  91   bfd_byte size[4];
  92   /* Code page.  */
  93   bfd_byte codepage[4];
  94   /* Reserved.  */
  95   bfd_byte reserved[4];
  96 };
  97
  98 /* Macros to swap in values.  */
  99
 100 #define getfi_16(fi, s) ((fi)->big_endian ? bfd_getb16 (s) : bfd_getl16 (s))
 101 #define getfi_32(fi, s) ((fi)->big_endian ? bfd_getb32 (s) : bfd_getl32 (s))
 102
 103 /* Local functions.  */
 104
 105 static void overrun PARAMS ((const struct coff_file_info *, const char *));
 106 static struct res_directory *read_coff_res_dir
 107   PARAMS ((const bfd_byte *, const struct coff_file_info *,
 108            const struct res_id *, int));
 109 static struct res_resource *read_coff_data_entry
 110   PARAMS ((const bfd_byte *, const struct coff_file_info *,
 111            const struct res_id *));
 112 \f
 113 /* Read the resources in a COFF file.  */
 114
 115 struct res_directory *
 116 read_coff_rsrc (filename, target)
 117      const char *filename;
 118      const char *target;
 119 {
 120   bfd *abfd;
 121   char **matching;
 122   asection *sec;
 123   bfd_size_type size;
 124   bfd_byte *data;
 125   struct coff_file_info finfo;
 126
 127   if (filename == NULL)
 128     fatal (_("filename required for COFF input"));
 129
 130   abfd = bfd_openr (filename, target);
 131   if (abfd == NULL)
 132     bfd_fatal (filename);
 133
 134   if (! bfd_check_format_matches (abfd, bfd_object, &matching))
 135     {
 136       bfd_nonfatal (bfd_get_filename (abfd));
 137       if (bfd_get_error () == bfd_error_file_ambiguously_recognized)
 138         list_matching_formats (matching);
 139       xexit (1);
 140     }
 141
 142   sec = bfd_get_section_by_name (abfd, ".rsrc");
 143   if (sec == NULL)
 144     {
 145       fprintf (stderr, _("%s: %s: no resource section\n"), program_name,
 146                filename);
 147       xexit (1);
 148     }
 149
 150   size = bfd_section_size (abfd, sec);
 151   data = (bfd_byte *) res_alloc (size);
 152
 153   if (! bfd_get_section_contents (abfd, sec, data, 0, size))
 154     bfd_fatal (_("can't read resource section"));
 155
 156   finfo.filename = filename;
 157   finfo.data = data;
 158   finfo.data_end = data + size;
 159   finfo.secaddr = (bfd_get_section_vma (abfd, sec)
 160                    - pe_data (abfd)->pe_opthdr.ImageBase);
 161   finfo.big_endian = bfd_big_endian (abfd);
 162
 163   bfd_close (abfd);
 164
 165   /* Now just read in the top level resource directory.  Note that we
 166      don't free data, since we create resource entries that point into
 167      it.  If we ever want to free up the resource information we read,
 168      this will have to be cleaned up.  */
 169
 170   return read_coff_res_dir (data, &finfo, (const struct res_id *) NULL, 0);
 171 }
 172
 173 /* Give an error if we are out of bounds.  */
 174
 175 static void
 176 overrun (finfo, msg)
 177      const struct coff_file_info *finfo;
 178      const char *msg;
 179 {
 180   fatal (_("%s: %s: address out of bounds"), finfo->filename, msg);
 181 }
 182
 183 /* Read a resource directory.  */
 184
 185 static struct res_directory *
 186 read_coff_res_dir (data, finfo, type, level)
 187      const bfd_byte *data;
 188      const struct coff_file_info *finfo;
 189      const struct res_id *type;
 190      int level;
 191 {
 192   const struct extern_res_directory *erd;
 193   struct res_directory *rd;
 194   int name_count, id_count, i;
 195   struct res_entry **pp;
 196   const struct extern_res_entry *ere;
 197
 198   if ((size_t) (finfo->data_end - data) < sizeof (struct extern_res_directory))
 199     overrun (finfo, _("directory"));
 200
 201   erd = (const struct extern_res_directory *) data;
 202
 203   rd = (struct res_directory *) res_alloc (sizeof *rd);
 204   rd->characteristics = getfi_32 (finfo, erd->characteristics);
 205   rd->time = getfi_32 (finfo, erd->time);
 206   rd->major = getfi_16 (finfo, erd->major);
 207   rd->minor = getfi_16 (finfo, erd->minor);
 208   rd->entries = NULL;
 209
 210   name_count = getfi_16 (finfo, erd->name_count);
 211   id_count = getfi_16 (finfo, erd->id_count);
 212
 213   pp = &rd->entries;
 214
 215   /* The resource directory entries immediately follow the directory
 216      table.  */
 217   ere = (const struct extern_res_entry *) (erd + 1);
 218
 219   for (i = 0; i < name_count; i++, ere++)
 220     {
 221       unsigned long name, rva;
 222       struct res_entry *re;
 223       const bfd_byte *ers;
 224       int length, j;
 225
 226       if ((const bfd_byte *) ere >= finfo->data_end)
 227         overrun (finfo, _("named directory entry"));
 228
 229       name = getfi_32 (finfo, ere->name);
 230       rva = getfi_32 (finfo, ere->rva);
 231
 232       /* For some reason the high bit in NAME is set.  */
 233       name &=~ 0x80000000;
 234
 235       if (name > (size_t) (finfo->data_end - finfo->data))
 236         overrun (finfo, _("directory entry name"));
 237
 238       ers = finfo->data + name;
 239
 240       re = (struct res_entry *) res_alloc (sizeof *re);
 241       re->next = NULL;
 242       re->id.named = 1;
 243       length = getfi_16 (finfo, ers);
 244       re->id.u.n.length = length;
 245       re->id.u.n.name = (unichar *) res_alloc (length * sizeof (unichar));
 246       for (j = 0; j < length; j++)
 247         re->id.u.n.name[j] = getfi_16 (finfo, ers + j * 2 + 2);
 248
 249       if (level == 0)
 250         type = &re->id;
 251
 252       if ((rva & 0x80000000) != 0)
 253         {
 254           rva &=~ 0x80000000;
 255           if (rva >= (size_t) (finfo->data_end - finfo->data))
 256             overrun (finfo, _("named subdirectory"));
 257           re->subdir = 1;
 258           re->u.dir = read_coff_res_dir (finfo->data + rva, finfo, type,
 259                                          level + 1);
 260         }
 261       else
 262         {
 263           if (rva >= (size_t) (finfo->data_end - finfo->data))
 264             overrun (finfo, _("named resource"));
 265           re->subdir = 0;
 266           re->u.res = read_coff_data_entry (finfo->data + rva, finfo, type);
 267         }
 268
 269       *pp = re;
 270       pp = &re->next;
 271     }
 272
 273   for (i = 0; i < id_count; i++, ere++)
 274     {
 275       unsigned long name, rva;
 276       struct res_entry *re;
 277
 278       if ((const bfd_byte *) ere >= finfo->data_end)
 279         overrun (finfo, _("ID directory entry"));
 280
 281       name = getfi_32 (finfo, ere->name);
 282       rva = getfi_32 (finfo, ere->rva);
 283
 284       re = (struct res_entry *) res_alloc (sizeof *re);
 285       re->next = NULL;
 286       re->id.named = 0;
 287       re->id.u.id = name;
 288
 289       if (level == 0)
 290         type = &re->id;
 291
 292       if ((rva & 0x80000000) != 0)
 293         {
 294           rva &=~ 0x80000000;
 295           if (rva >= (size_t) (finfo->data_end - finfo->data))
 296             overrun (finfo, _("ID subdirectory"));
 297           re->subdir = 1;
 298           re->u.dir = read_coff_res_dir (finfo->data + rva, finfo, type,
 299                                          level + 1);
 300         }
 301       else
 302         {
 303           if (rva >= (size_t) (finfo->data_end - finfo->data))
 304             overrun (finfo, _("ID resource"));
 305           re->subdir = 0;
 306           re->u.res = read_coff_data_entry (finfo->data + rva, finfo, type);
 307         }
 308
 309       *pp = re;
 310       pp = &re->next;
 311     }
 312
 313   return rd;
 314 }
 315
 316 /* Read a resource data entry.  */
 317
 318 static struct res_resource *
 319 read_coff_data_entry (data, finfo, type)
 320      const bfd_byte *data;
 321      const struct coff_file_info *finfo;
 322      const struct res_id *type;
 323 {
 324   const struct extern_res_data *erd;
 325   struct res_resource *r;
 326   unsigned long size, rva;
 327   const bfd_byte *resdata;
 328
 329   if (type == NULL)
 330     fatal (_("resource type unknown"));
 331
 332   if ((size_t) (finfo->data_end - data) < sizeof (struct extern_res_data))
 333     overrun (finfo, _("data entry"));
 334
 335   erd = (const struct extern_res_data *) data;
 336
 337   size = getfi_32 (finfo, erd->size);
 338   rva = getfi_32 (finfo, erd->rva);
 339   if (rva < finfo->secaddr
 340       || rva - finfo->secaddr >= (size_t) (finfo->data_end - finfo->data))
 341     overrun (finfo, _("resource data"));
 342
 343   resdata = finfo->data + (rva - finfo->secaddr);
 344
 345   if (size > (size_t) (finfo->data_end - resdata))
 346     overrun (finfo, _("resource data size"));
 347
 348   r = bin_to_res (*type, resdata, size, finfo->big_endian);
 349
 350   memset (&r->res_info, 0, sizeof (struct res_res_info));
 351   r->coff_info.codepage = getfi_32 (finfo, erd->codepage);
 352   r->coff_info.reserved = getfi_32 (finfo, erd->reserved);
 353
 354   return r;
 355 }
 356 \f
 357 /* This structure is used to build a list of bindata structures.  */
 358
 359 struct bindata_build
 360 {
 361   /* The data.  */
 362   struct bindata *d;
 363   /* The last structure we have added to the list.  */
 364   struct bindata *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   bfd *abfd;
 377   /* Non-zero if the file is big endian.  */
 378   int big_endian;
 379   /* Pointer to section symbol used to build RVA relocs.  */
 380   asymbol **sympp;
 381
 382   /* These fields are computed initially, and then not changed.  */
 383   /* Length of directory tables and entries.  */
 384   unsigned long dirsize;
 385   /* Length of directory entry strings.  */
 386   unsigned long dirstrsize;
 387   /* Length of resource data entries.  */
 388   unsigned long dataentsize;
 389
 390   /* These fields are updated as we add data.  */
 391   /* Directory tables and entries.  */
 392   struct bindata_build dirs;
 393   /* Directory entry strings.  */
 394   struct bindata_build dirstrs;
 395   /* Resource data entries.  */
 396   struct bindata_build dataents;
 397   /* Actual resource data.  */
 398   struct bindata_build resources;
 399   /* Relocations.  */
 400   arelent **relocs;
 401   /* Number of relocations.  */
 402   unsigned int reloc_count;
 403 };
 404
 405 /* Macros to swap out values.  */
 406
 407 #define putcwi_16(cwi, v, s) \
 408   ((cwi->big_endian) ? bfd_putb16 ((v), (s)) : bfd_putl16 ((v), (s)))
 409 #define putcwi_32(cwi, v, s) \
 410   ((cwi->big_endian) ? bfd_putb32 ((v), (s)) : bfd_putl32 ((v), (s)))
 411
 412 static void coff_bin_sizes
 413   PARAMS ((const struct res_directory *, struct coff_write_info *));
 414 static unsigned char *coff_alloc PARAMS ((struct bindata_build *, size_t));
 415 static void coff_to_bin
 416   PARAMS ((const struct res_directory *, struct coff_write_info *));
 417 static void coff_res_to_bin
 418   PARAMS ((const struct res_resource *, struct coff_write_info *));
 419
 420 /* Write resources to a COFF file.  RESOURCES should already be
 421    sorted.
 422
 423    Right now we always create a new file.  Someday we should also
 424    offer the ability to merge resources into an existing file.  This
 425    would require doing the basic work of objcopy, just modifying or
 426    adding the .rsrc section.  */
 427
 428 void
 429 write_coff_file (filename, target, resources)
 430      const char *filename;
 431      const char *target;
 432      const struct res_directory *resources;
 433 {
 434   bfd *abfd;
 435   asection *sec;
 436   struct coff_write_info cwi;
 437   struct bindata *d;
 438   unsigned long length, offset;
 439
 440   if (filename == NULL)
 441     fatal (_("filename required for COFF output"));
 442
 443   abfd = bfd_openw (filename, target);
 444   if (abfd == NULL)
 445     bfd_fatal (filename);
 446
 447   if (! bfd_set_format (abfd, bfd_object))
 448     bfd_fatal ("bfd_set_format");
 449
 450 #ifdef DLLTOOL_ARM
 451   if (! bfd_set_arch_mach (abfd, bfd_arch_arm, 0))
 452     bfd_fatal ("bfd_set_arch_mach(arm)");
 453 #else
 454   /* FIXME: This is obviously i386 specific.  */
 455   if (! bfd_set_arch_mach (abfd, bfd_arch_i386, 0))
 456     bfd_fatal ("bfd_set_arch_mach(i386)");
 457 #endif /* arm */
 458
 459   if (! bfd_set_file_flags (abfd, HAS_SYMS | HAS_RELOC))
 460     bfd_fatal ("bfd_set_file_flags");
 461
 462   sec = bfd_make_section (abfd, ".rsrc");
 463   if (sec == NULL)
 464     bfd_fatal ("bfd_make_section");
 465
 466   if (! bfd_set_section_flags (abfd, sec,
 467                                (SEC_HAS_CONTENTS | SEC_ALLOC
 468                                 | SEC_LOAD | SEC_DATA)))
 469     bfd_fatal ("bfd_set_section_flags");
 470
 471   if (! bfd_set_symtab (abfd, sec->symbol_ptr_ptr, 1))
 472     bfd_fatal ("bfd_set_symtab");
 473
 474   /* Requiring this is probably a bug in BFD.  */
 475   sec->output_section = sec;
 476
 477   /* The order of data in the .rsrc section is
 478        resource directory tables and entries
 479        resource directory strings
 480        resource data entries
 481        actual resource data
 482
 483      We build these different types of data in different lists.  */
 484
 485   cwi.abfd = abfd;
 486   cwi.big_endian = bfd_big_endian (abfd);
 487   cwi.sympp = sec->symbol_ptr_ptr;
 488   cwi.dirsize = 0;
 489   cwi.dirstrsize = 0;
 490   cwi.dataentsize = 0;
 491   cwi.dirs.d = NULL;
 492   cwi.dirs.last = NULL;
 493   cwi.dirs.length = 0;
 494   cwi.dirstrs.d = NULL;
 495   cwi.dirstrs.last = NULL;
 496   cwi.dirstrs.length = 0;
 497   cwi.dataents.d = NULL;
 498   cwi.dataents.last = NULL;
 499   cwi.dataents.length = 0;
 500   cwi.resources.d = NULL;
 501   cwi.resources.last = NULL;
 502   cwi.resources.length = 0;
 503   cwi.relocs = NULL;
 504   cwi.reloc_count = 0;
 505
 506   /* Work out the sizes of the resource directory entries, so that we
 507      know the various offsets we will need.  */
 508   coff_bin_sizes (resources, &cwi);
 509
 510   /* Force the directory strings to be 32 bit aligned.  Every other
 511      structure is 32 bit aligned anyhow.  */
 512   cwi.dirstrsize = (cwi.dirstrsize + 3) &~ 3;
 513
 514   /* Actually convert the resources to binary.  */
 515   coff_to_bin (resources, &cwi);
 516
 517   /* Add another 2 bytes to the directory strings if needed for
 518      alignment.  */
 519   if ((cwi.dirstrs.length & 3) != 0)
 520     {
 521       unsigned char *ex;
 522
 523       ex = coff_alloc (&cwi.dirstrs, 2);
 524       ex[0] = 0;
 525       ex[1] = 0;
 526     }
 527
 528   /* Make sure that the data we built came out to the same size as we
 529      calculated initially.  */
 530   assert (cwi.dirs.length == cwi.dirsize);
 531   assert (cwi.dirstrs.length == cwi.dirstrsize);
 532   assert (cwi.dataents.length == cwi.dataentsize);
 533
 534   length = (cwi.dirsize
 535             + cwi.dirstrsize
 536             + cwi.dataentsize
 537             + cwi.resources.length);
 538
 539   if (! bfd_set_section_size (abfd, sec, length))
 540     bfd_fatal ("bfd_set_section_size");
 541
 542   bfd_set_reloc (abfd, sec, cwi.relocs, cwi.reloc_count);
 543
 544   offset = 0;
 545   for (d = cwi.dirs.d; d != NULL; d = d->next)
 546     {
 547       if (! bfd_set_section_contents (abfd, sec, d->data, offset, d->length))
 548         bfd_fatal ("bfd_set_section_contents");
 549       offset += d->length;
 550     }
 551   for (d = cwi.dirstrs.d; d != NULL; d = d->next)
 552     {
 553       if (! bfd_set_section_contents (abfd, sec, d->data, offset, d->length))
 554         bfd_fatal ("bfd_set_section_contents");
 555       offset += d->length;
 556     }
 557   for (d = cwi.dataents.d; d != NULL; d = d->next)
 558     {
 559       if (! bfd_set_section_contents (abfd, sec, d->data, offset, d->length))
 560         bfd_fatal ("bfd_set_section_contents");
 561       offset += d->length;
 562     }
 563   for (d = cwi.resources.d; d != NULL; d = d->next)
 564     {
 565       if (! bfd_set_section_contents (abfd, sec, d->data, offset, d->length))
 566         bfd_fatal ("bfd_set_section_contents");
 567       offset += d->length;
 568     }
 569
 570   assert (offset == length);
 571
 572   if (! bfd_close (abfd))
 573     bfd_fatal ("bfd_close");
 574
 575   /* We allocated the relocs array using malloc.  */
 576   free (cwi.relocs);
 577 }
 578
 579 /* Work out the sizes of the various fixed size resource directory
 580    entries.  This updates fields in CWI.  */
 581
 582 static void
 583 coff_bin_sizes (resdir, cwi)
 584      const struct res_directory *resdir;
 585      struct coff_write_info *cwi;
 586 {
 587   const struct res_entry *re;
 588
 589   cwi->dirsize += sizeof (struct extern_res_directory);
 590
 591   for (re = resdir->entries; re != NULL; re = re->next)
 592     {
 593       cwi->dirsize += sizeof (struct extern_res_entry);
 594
 595       if (re->id.named)
 596         cwi->dirstrsize += re->id.u.n.length * 2 + 2;
 597
 598       if (re->subdir)
 599         coff_bin_sizes (re->u.dir, cwi);
 600       else
 601         cwi->dataentsize += sizeof (struct extern_res_data);
 602     }
 603 }
 604
 605 /* Allocate data for a particular list.  */
 606
 607 static unsigned char *
 608 coff_alloc (bb, size)
 609      struct bindata_build *bb;
 610      size_t size;
 611 {
 612   struct bindata *d;
 613
 614   d = (struct bindata *) reswr_alloc (sizeof *d);
 615
 616   d->next = NULL;
 617   d->data = (unsigned char *) reswr_alloc (size);
 618   d->length = size;
 619
 620   if (bb->d == NULL)
 621     bb->d = d;
 622   else
 623     bb->last->next = d;
 624   bb->last = d;
 625   bb->length += size;
 626
 627   return d->data;
 628 }
 629
 630 /* Convert the resource directory RESDIR to binary.  */
 631
 632 static void
 633 coff_to_bin (resdir, cwi)
 634      const struct res_directory *resdir;
 635      struct coff_write_info *cwi;
 636 {
 637   struct extern_res_directory *erd;
 638   int ci, cn;
 639   const struct res_entry *e;
 640   struct extern_res_entry *ere;
 641
 642   /* Write out the directory table.  */
 643
 644   erd = ((struct extern_res_directory *)
 645          coff_alloc (&cwi->dirs, sizeof (*erd)));
 646
 647   putcwi_32 (cwi, resdir->characteristics, erd->characteristics);
 648   putcwi_32 (cwi, resdir->time, erd->time);
 649   putcwi_16 (cwi, resdir->major, erd->major);
 650   putcwi_16 (cwi, resdir->minor, erd->minor);
 651
 652   ci = 0;
 653   cn = 0;
 654   for (e = resdir->entries; e != NULL; e = e->next)
 655     {
 656       if (e->id.named)
 657         ++cn;
 658       else
 659         ++ci;
 660     }
 661
 662   putcwi_16 (cwi, cn, erd->name_count);
 663   putcwi_16 (cwi, ci, erd->id_count);
 664
 665   /* Write out the data entries.  Note that we allocate space for all
 666      the entries before writing them out.  That permits a recursive
 667      call to work correctly when writing out subdirectories.  */
 668
 669   ere = ((struct extern_res_entry *)
 670          coff_alloc (&cwi->dirs, (ci + cn) * sizeof (*ere)));
 671   for (e = resdir->entries; e != NULL; e = e->next, ere++)
 672     {
 673       if (! e->id.named)
 674         putcwi_32 (cwi, e->id.u.id, ere->name);
 675       else
 676         {
 677           unsigned char *str;
 678           int i;
 679
 680           /* For some reason existing files seem to have the high bit
 681              set on the address of the name, although that is not
 682              documented.  */
 683           putcwi_32 (cwi,
 684                      0x80000000 | (cwi->dirsize + cwi->dirstrs.length),
 685                      ere->name);
 686
 687           str = coff_alloc (&cwi->dirstrs, e->id.u.n.length * 2 + 2);
 688           putcwi_16 (cwi, e->id.u.n.length, str);
 689           for (i = 0; i < e->id.u.n.length; i++)
 690             putcwi_16 (cwi, e->id.u.n.name[i], str + i * 2 + 2);
 691         }
 692
 693       if (e->subdir)
 694         {
 695           putcwi_32 (cwi, 0x80000000 | cwi->dirs.length, ere->rva);
 696           coff_to_bin (e->u.dir, cwi);
 697         }
 698       else
 699         {
 700           putcwi_32 (cwi,
 701                      cwi->dirsize + cwi->dirstrsize + cwi->dataents.length,
 702                      ere->rva);
 703
 704           coff_res_to_bin (e->u.res, cwi);
 705         }
 706     }
 707 }
 708
 709 /* Convert the resource RES to binary.  */
 710
 711 static void
 712 coff_res_to_bin (res, cwi)
 713      const struct res_resource *res;
 714      struct coff_write_info *cwi;
 715 {
 716   arelent *r;
 717   struct extern_res_data *erd;
 718   struct bindata *d;
 719   unsigned long length;
 720
 721   /* For some reason, although every other address is a section
 722      offset, the address of the resource data itself is an RVA.  That
 723      means that we need to generate a relocation for it.  We allocate
 724      the relocs array using malloc so that we can use realloc.  FIXME:
 725      This relocation handling is correct for the i386, but probably
 726      not for any other target.  */
 727
 728   r = (arelent *) reswr_alloc (sizeof (arelent));
 729   r->sym_ptr_ptr = cwi->sympp;
 730   r->address = cwi->dirsize + cwi->dirstrsize + cwi->dataents.length;
 731   r->addend = 0;
 732   r->howto = bfd_reloc_type_lookup (cwi->abfd, BFD_RELOC_RVA);
 733   if (r->howto == NULL)
 734     bfd_fatal (_("can't get BFD_RELOC_RVA relocation type"));
 735
 736   cwi->relocs = xrealloc (cwi->relocs,
 737                           (cwi->reloc_count + 2) * sizeof (arelent *));
 738   cwi->relocs[cwi->reloc_count] = r;
 739   cwi->relocs[cwi->reloc_count + 1] = NULL;
 740   ++cwi->reloc_count;
 741
 742   erd = (struct extern_res_data *) coff_alloc (&cwi->dataents, sizeof (*erd));
 743
 744   putcwi_32 (cwi,
 745              (cwi->dirsize
 746               + cwi->dirstrsize
 747               + cwi->dataentsize
 748               + cwi->resources.length),
 749              erd->rva);
 750   putcwi_32 (cwi, res->coff_info.codepage, erd->codepage);
 751   putcwi_32 (cwi, res->coff_info.reserved, erd->reserved);
 752
 753   d = res_to_bin (res, cwi->big_endian);
 754
 755   if (cwi->resources.d == NULL)
 756     cwi->resources.d = d;
 757   else
 758     cwi->resources.last->next = d;
 759
 760   length = 0;
 761   for (; d->next != NULL; d = d->next)
 762     length += d->length;
 763   length += d->length;
 764   cwi->resources.last = d;
 765   cwi->resources.length += length;
 766
 767   putcwi_32 (cwi, length, erd->size);
 768
 769   /* Force the next resource to have 32 bit alignment.  */
 770
 771   if ((length & 3) != 0)
 772     {
 773       int add;
 774       unsigned char *ex;
 775
 776       add = 4 - (length & 3);
 777
 778       ex = coff_alloc (&cwi->resources, add);
 779       memset (ex, 0, add);
 780     }
 781 }