gio/gresource-tool.c

   1 /*
   2  * Copyright © 2012 Red Hat, Inc
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  16  *
  17  * Author: Matthias Clasen
  18  */
  19
  20 #include "config.h"
  21
  22 #include <stdlib.h>
  23 #include <stdio.h>
  24
  25 #include <sys/types.h>
  26 #include <sys/stat.h>
  27 #include <fcntl.h>
  28 #include <string.h>
  29 #include <locale.h>
  30
  31 #ifdef HAVE_LIBELF
  32 #include <libelf.h>
  33 #include <gelf.h>
  34 #include <sys/mman.h>
  35 #endif
  36
  37 #include <gio/gio.h>
  38 #include <glib/gstdio.h>
  39 #include <gi18n.h>
  40
  41 #ifdef G_OS_WIN32
  42 #include "glib/glib-private.h"
  43 #endif
  44
  45 /* GResource functions {{{1 */
  46 static GResource *
  47 get_resource (const gchar *file)
  48 {
  49   gchar *content;
  50   gsize size;
  51   GResource *resource;
  52   GBytes *data;
  53
  54   resource = NULL;
  55
  56   if (g_file_get_contents (file, &content, &size, NULL))
  57     {
  58       data = g_bytes_new_take (content, size);
  59       resource = g_resource_new_from_data (data, NULL);
  60       g_bytes_unref (data);
  61     }
  62
  63   return resource;
  64 }
  65
  66 static void
  67 list_resource (GResource   *resource,
  68                const gchar *path,
  69                const gchar *section,
  70                const gchar *prefix,
  71                gboolean     details)
  72 {
  73   gchar **children;
  74   gsize size;
  75   guint32 flags;
  76   gint i;
  77   gchar *child;
  78   GError *error = NULL;
  79   gint len;
  80
  81   children = g_resource_enumerate_children (resource, path, 0, &error);
  82   if (error)
  83     {
  84       g_printerr ("%s\n", error->message);
  85       g_error_free (error);
  86       return;
  87     }
  88   for (i = 0; children[i]; i++)
  89     {
  90       child = g_strconcat (path, children[i], NULL);
  91
  92       len = MIN (strlen (child), strlen (prefix));
  93       if (strncmp (child, prefix, len) != 0)
  94         {
  95           g_free (child);
  96           continue;
  97         }
  98
  99       if (g_resource_get_info (resource, child, 0, &size, &flags, NULL))
 100         {
 101           if (details)
 102             g_print ("%s%s%6"G_GSIZE_FORMAT " %s %s\n", section, section[0] ? " " : "", size, (flags & G_RESOURCE_FLAGS_COMPRESSED) ? "c" : "u", child);
 103           else
 104             g_print ("%s\n", child);
 105         }
 106       else
 107         list_resource (resource, child, section, prefix, details);
 108
 109       g_free (child);
 110     }
 111   g_strfreev (children);
 112 }
 113
 114 static void
 115 extract_resource (GResource   *resource,
 116                   const gchar *path)
 117 {
 118   GBytes *bytes;
 119
 120   bytes = g_resource_lookup_data (resource, path, 0, NULL);
 121   if (bytes != NULL)
 122     {
 123       gconstpointer data;
 124       gsize size, written;
 125
 126       data = g_bytes_get_data (bytes, &size);
 127       written = fwrite (data, 1, size, stdout);
 128       if (written < size)
 129         g_printerr ("Data truncated\n");
 130       g_bytes_unref (bytes);
 131     }
 132 }
 133
 134 /* Elf functions {{{1 */
 135
 136 #ifdef HAVE_LIBELF
 137
 138 static Elf *
 139 get_elf (const gchar *file,
 140          gint        *fd)
 141 {
 142   Elf *elf;
 143
 144   if (elf_version (EV_CURRENT) == EV_NONE )
 145     return NULL;
 146
 147   *fd = g_open (file, O_RDONLY, 0);
 148   if (*fd < 0)
 149     return NULL;
 150
 151   elf = elf_begin (*fd, ELF_C_READ, NULL);
 152   if (elf == NULL)
 153     {
 154       g_close (*fd, NULL);
 155       *fd = -1;
 156       return NULL;
 157     }
 158
 159   if (elf_kind (elf) != ELF_K_ELF)
 160     {
 161       g_close (*fd, NULL);
 162       *fd = -1;
 163       return NULL;
 164     }
 165
 166   return elf;
 167 }
 168
 169 typedef gboolean (*SectionCallback) (GElf_Shdr   *shdr,
 170                                      const gchar *name,
 171                                      gpointer     data);
 172
 173 static void
 174 elf_foreach_resource_section (Elf             *elf,
 175                               SectionCallback  callback,
 176                               gpointer         data)
 177 {
 178   size_t shstrndx, shnum;
 179   size_t scnidx;
 180   Elf_Scn *scn;
 181   GElf_Shdr *shdr, shdr_mem;
 182   const gchar *section_name;
 183
 184   elf_getshdrstrndx (elf, &shstrndx);
 185   g_assert (shstrndx >= 0);
 186
 187   elf_getshdrnum (elf, &shnum);
 188   g_assert (shnum >= 0);
 189
 190   for (scnidx = 1; scnidx < shnum; scnidx++)
 191     {
 192       scn = elf_getscn (elf, scnidx);
 193       if (scn == NULL)
 194         continue;
 195
 196       shdr = gelf_getshdr (scn, &shdr_mem);
 197       if (shdr == NULL)
 198         continue;
 199
 200       if (shdr->sh_type != SHT_PROGBITS)
 201         continue;
 202
 203       section_name = elf_strptr (elf, shstrndx, shdr->sh_name);
 204       if (section_name == NULL ||
 205           !g_str_has_prefix (section_name, ".gresource."))
 206         continue;
 207
 208       if (!callback (shdr, section_name + strlen (".gresource."), data))
 209         break;
 210     }
 211 }
 212
 213 static GResource *
 214 resource_from_section (GElf_Shdr *shdr,
 215                        int        fd)
 216 {
 217   gsize page_size, page_offset;
 218   char *contents;
 219   GResource *resource;
 220
 221   resource = NULL;
 222
 223   page_size = sysconf(_SC_PAGE_SIZE);
 224   page_offset = shdr->sh_offset % page_size;
 225   contents = mmap (NULL,  shdr->sh_size + page_offset,
 226                    PROT_READ, MAP_PRIVATE, fd, shdr->sh_offset - page_offset);
 227   if (contents != MAP_FAILED)
 228     {
 229       GBytes *bytes;
 230       GError *error = NULL;
 231
 232       bytes = g_bytes_new_static (contents + page_offset, shdr->sh_size);
 233       resource = g_resource_new_from_data (bytes, &error);
 234       g_bytes_unref (bytes);
 235       if (error)
 236         {
 237           g_printerr ("%s\n", error->message);
 238           g_error_free (error);
 239         }
 240     }
 241   else
 242     {
 243       g_printerr ("Can't mmap resource section");
 244     }
 245
 246   return resource;
 247 }
 248
 249 typedef struct
 250 {
 251   int fd;
 252   const gchar *section;
 253   const gchar *path;
 254   gboolean details;
 255   gboolean found;
 256 } CallbackData;
 257
 258 static gboolean
 259 list_resources_cb (GElf_Shdr   *shdr,
 260                    const gchar *section,
 261                    gpointer     data)
 262 {
 263   CallbackData *d = data;
 264   GResource *resource;
 265
 266   if (d->section && strcmp (section, d->section) != 0)
 267     return TRUE;
 268
 269   d->found = TRUE;
 270
 271   resource = resource_from_section (shdr, d->fd);
 272   list_resource (resource, "/",
 273                  d->section ? "" : section,
 274                  d->path,
 275                  d->details);
 276   g_resource_unref (resource);
 277
 278   if (d->section)
 279     return FALSE;
 280
 281   return TRUE;
 282 }
 283
 284 static void
 285 elf_list_resources (Elf         *elf,
 286                     int          fd,
 287                     const gchar *section,
 288                     const gchar *path,
 289                     gboolean     details)
 290 {
 291   CallbackData data;
 292
 293   data.fd = fd;
 294   data.section = section;
 295   data.path = path;
 296   data.details = details;
 297   data.found = FALSE;
 298
 299   elf_foreach_resource_section (elf, list_resources_cb, &data);
 300
 301   if (!data.found)
 302     g_printerr ("Can't find resource section %s\n", section);
 303 }
 304
 305 static gboolean
 306 extract_resource_cb (GElf_Shdr   *shdr,
 307                      const gchar *section,
 308                      gpointer     data)
 309 {
 310   CallbackData *d = data;
 311   GResource *resource;
 312
 313   if (d->section && strcmp (section, d->section) != 0)
 314     return TRUE;
 315
 316   d->found = TRUE;
 317
 318   resource = resource_from_section (shdr, d->fd);
 319   extract_resource (resource, d->path);
 320   g_resource_unref (resource);
 321
 322   if (d->section)
 323     return FALSE;
 324
 325   return TRUE;
 326 }
 327
 328 static void
 329 elf_extract_resource (Elf         *elf,
 330                       int          fd,
 331                       const gchar *section,
 332                       const gchar *path)
 333 {
 334   CallbackData data;
 335
 336   data.fd = fd;
 337   data.section = section;
 338   data.path = path;
 339   data.found = FALSE;
 340
 341   elf_foreach_resource_section (elf, extract_resource_cb, &data);
 342
 343   if (!data.found)
 344     g_printerr ("Can't find resource section %s\n", section);
 345 }
 346
 347 static gboolean
 348 print_section_name (GElf_Shdr   *shdr,
 349                     const gchar *name,
 350                     gpointer     data)
 351 {
 352   g_print ("%s\n", name);
 353   return TRUE;
 354 }
 355
 356 #endif /* HAVE_LIBELF */
 357
 358   /* Toplevel commands {{{1 */
 359
 360 static void
 361 cmd_sections (const gchar *file,
 362               const gchar *section,
 363               const gchar *path,
 364               gboolean     details)
 365 {
 366   GResource *resource;
 367
 368 #ifdef HAVE_LIBELF
 369
 370   Elf *elf;
 371   gint fd;
 372
 373   if ((elf = get_elf (file, &fd)))
 374     {
 375       elf_foreach_resource_section (elf, print_section_name, NULL);
 376       elf_end (elf);
 377       close (fd);
 378     }
 379   else
 380
 381 #endif
 382
 383   if ((resource = get_resource (file)))
 384     {
 385       /* No sections */
 386       g_resource_unref (resource);
 387     }
 388   else
 389     {
 390       g_printerr ("Don't know how to handle %s\n", file);
 391 #ifndef HAVE_LIBELF
 392       g_printerr ("gresource is built without elf support\n");
 393 #endif
 394     }
 395 }
 396
 397 static void
 398 cmd_list (const gchar *file,
 399           const gchar *section,
 400           const gchar *path,
 401           gboolean     details)
 402 {
 403   GResource *resource;
 404
 405 #ifdef HAVE_LIBELF
 406   Elf *elf;
 407   int fd;
 408
 409   if ((elf = get_elf (file, &fd)))
 410     {
 411       elf_list_resources (elf, fd, section, path ? path : "", details);
 412       elf_end (elf);
 413       close (fd);
 414     }
 415   else
 416
 417 #endif
 418
 419   if ((resource = get_resource (file)))
 420     {
 421       list_resource (resource, "/", "", path ? path : "", details);
 422       g_resource_unref (resource);
 423     }
 424   else
 425     {
 426       g_printerr ("Don't know how to handle %s\n", file);
 427 #ifndef HAVE_LIBELF
 428       g_printerr ("gresource is built without elf support\n");
 429 #endif
 430     }
 431 }
 432
 433 static void
 434 cmd_extract (const gchar *file,
 435              const gchar *section,
 436              const gchar *path,
 437              gboolean     details)
 438 {
 439   GResource *resource;
 440
 441 #ifdef HAVE_LIBELF
 442
 443   Elf *elf;
 444   int fd;
 445
 446   if ((elf = get_elf (file, &fd)))
 447     {
 448       elf_extract_resource (elf, fd, section, path);
 449       elf_end (elf);
 450       close (fd);
 451     }
 452   else
 453
 454 #endif
 455
 456   if ((resource = get_resource (file)))
 457     {
 458       extract_resource (resource, path);
 459       g_resource_unref (resource);
 460     }
 461   else
 462     {
 463       g_printerr ("Don't know how to handle %s\n", file);
 464 #ifndef HAVE_LIBELF
 465       g_printerr ("gresource is built without elf support\n");
 466 #endif
 467     }
 468 }
 469
 470 static gint
 471 cmd_help (gboolean     requested,
 472           const gchar *command)
 473 {
 474   const gchar *description;
 475   const gchar *synopsis;
 476   gchar *option;
 477   GString *string;
 478
 479   option = NULL;
 480
 481   string = g_string_new (NULL);
 482
 483   if (command == NULL)
 484     ;
 485
 486   else if (strcmp (command, "help") == 0)
 487     {
 488       description = _("Print help");
 489       synopsis = _("[COMMAND]");
 490     }
 491
 492   else if (strcmp (command, "sections") == 0)
 493     {
 494       description = _("List sections containing resources in an elf FILE");
 495       synopsis = _("FILE");
 496     }
 497
 498   else if (strcmp (command, "list") == 0)
 499     {
 500       description = _("List resources\n"
 501                       "If SECTION is given, only list resources in this section\n"
 502                       "If PATH is given, only list matching resources");
 503       synopsis = _("FILE [PATH]");
 504       option = g_strdup_printf ("[--section %s]", _("SECTION"));
 505     }
 506
 507   else if (strcmp (command, "details") == 0)
 508     {
 509       description = _("List resources with details\n"
 510                       "If SECTION is given, only list resources in this section\n"
 511                       "If PATH is given, only list matching resources\n"
 512                       "Details include the section, size and compression");
 513       synopsis = _("FILE [PATH]");
 514       option = g_strdup_printf ("[--section %s]", _("SECTION"));
 515     }
 516
 517   else if (strcmp (command, "extract") == 0)
 518     {
 519       description = _("Extract a resource file to stdout");
 520       synopsis = _("FILE PATH");
 521       option = g_strdup_printf ("[--section %s]", _("SECTION"));
 522     }
 523
 524   else
 525     {
 526       g_string_printf (string, _("Unknown command %s\n\n"), command);
 527       requested = FALSE;
 528       command = NULL;
 529     }
 530
 531   if (command == NULL)
 532     {
 533       g_string_append (string,
 534       _("Usage:\n"
 535         "  gresource [--section SECTION] COMMAND [ARGS…]\n"
 536         "\n"
 537         "Commands:\n"
 538         "  help                      Show this information\n"
 539         "  sections                  List resource sections\n"
 540         "  list                      List resources\n"
 541         "  details                   List resources with details\n"
 542         "  extract                   Extract a resource\n"
 543         "\n"
 544         "Use “gresource help COMMAND” to get detailed help.\n\n"));
 545     }
 546   else
 547     {
 548       g_string_append_printf (string, _("Usage:\n  gresource %s%s%s %s\n\n%s\n\n"),
 549                               option ? option : "", option ? " " : "", command, synopsis[0] ? synopsis : "", description);
 550
 551       g_string_append (string, _("Arguments:\n"));
 552
 553       if (option)
 554         g_string_append (string,
 555                          _("  SECTION   An (optional) elf section name\n"));
 556
 557       if (strstr (synopsis, _("[COMMAND]")))
 558         g_string_append (string,
 559                        _("  COMMAND   The (optional) command to explain\n"));
 560
 561       if (strstr (synopsis, _("FILE")))
 562         {
 563           if (strcmp (command, "sections") == 0)
 564             g_string_append (string,
 565                              _("  FILE      An elf file (a binary or a shared library)\n"));
 566           else
 567             g_string_append (string,
 568                              _("  FILE      An elf file (a binary or a shared library)\n"
 569                                "            or a compiled resource file\n"));
 570         }
 571
 572       if (strstr (synopsis, _("[PATH]")))
 573         g_string_append (string,
 574                        _("  PATH      An (optional) resource path (may be partial)\n"));
 575       else if (strstr (synopsis, _("PATH")))
 576         g_string_append (string,
 577                        _("  PATH      A resource path\n"));
 578
 579       g_string_append (string, "\n");
 580     }
 581
 582   if (requested)
 583     g_print ("%s", string->str);
 584   else
 585     g_printerr ("%s\n", string->str);
 586
 587   g_free (option);
 588   g_string_free (string, TRUE);
 589
 590   return requested ? 0 : 1;
 591 }
 592
 593 /* main {{{1 */
 594
 595 int
 596 main (int argc, char *argv[])
 597 {
 598   gchar *section = NULL;
 599   gboolean details = FALSE;
 600   void (* function) (const gchar *, const gchar *, const gchar *, gboolean);
 601
 602 #ifdef G_OS_WIN32
 603   gchar *tmp;
 604 #endif
 605
 606   setlocale (LC_ALL, "");
 607   textdomain (GETTEXT_PACKAGE);
 608
 609 #ifdef G_OS_WIN32
 610   tmp = _glib_get_locale_dir ();
 611   bindtextdomain (GETTEXT_PACKAGE, tmp);
 612   g_free (tmp);
 613 #else
 614   bindtextdomain (GETTEXT_PACKAGE, GLIB_LOCALE_DIR);
 615 #endif
 616
 617 #ifdef HAVE_BIND_TEXTDOMAIN_CODESET
 618   bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
 619 #endif
 620
 621   if (argc < 2)
 622     return cmd_help (FALSE, NULL);
 623
 624   if (argc > 3 && strcmp (argv[1], "--section") == 0)
 625     {
 626       section = argv[2];
 627       argv = argv + 2;
 628       argc -= 2;
 629     }
 630
 631   if (strcmp (argv[1], "help") == 0)
 632     return cmd_help (TRUE, argv[2]);
 633
 634   else if (argc == 4 && strcmp (argv[1], "extract") == 0)
 635     function = cmd_extract;
 636
 637   else if (argc == 3 && strcmp (argv[1], "sections") == 0)
 638     function = cmd_sections;
 639
 640   else if ((argc == 3 || argc == 4) && strcmp (argv[1], "list") == 0)
 641     {
 642       function = cmd_list;
 643       details = FALSE;
 644     }
 645   else if ((argc == 3 || argc == 4) && strcmp (argv[1], "details") == 0)
 646     {
 647       function = cmd_list;
 648       details = TRUE;
 649     }
 650   else
 651     return cmd_help (FALSE, argv[1]);
 652
 653   (* function) (argv[2], section, argc > 3 ? argv[3] : NULL, details);
 654
 655   return 0;
 656 }
 657
 658 /* vim:set foldmethod=marker: */