backend/comics/comics-document.c

   1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; c-indent-level: 8 -*- */
   2 /*
   3  * Copyright (C) 2005, Teemu Tervo <teemu.tervo@gmx.net>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2, or (at your option)
   8  * any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  */
  19
  20 #include "config.h"
  21
  22 #include <config.h>
  23 #include <unistd.h>
  24 #include <string.h>
  25 #include <glib/gi18n-lib.h>
  26 #include <glib/gstdio.h>
  27 #include <gio/gio.h>
  28 #include <sys/wait.h>
  29 #include <stdlib.h>
  30 #include <errno.h>
  31
  32 #include "comics-document.h"
  33 #include "ev-document-misc.h"
  34 #include "ev-document-thumbnails.h"
  35 #include "ev-file-helpers.h"
  36
  37 struct _ComicsDocumentClass
  38 {
  39         GObjectClass parent_class;
  40 };
  41
  42 typedef enum
  43 {
  44         RARLABS,
  45         GNAUNRAR,
  46         UNZIP,
  47         P7ZIP
  48 } ComicBookDecompressType;
  49
  50 struct _ComicsDocument
  51 {
  52         GObject parent_instance;
  53         gchar    *archive, *dir;
  54         GSList   *page_names;
  55         gint     n_pages;
  56         gchar    *selected_command;
  57         gchar    *extract_command, *list_command, *decompress_tmp;
  58         gboolean regex_arg;
  59         ComicBookDecompressType command_usage;
  60 };
  61
  62 struct
  63 {
  64         char *extract, *list, *decompress_tmp;
  65         gboolean regex_arg;
  66 } command_usage_def[] = {
  67         {"%s p -c- -ierr", "%s vb -c- -- %s", NULL          , FALSE},
  68         {NULL            , "%s t %s"        , "%s -xf %s %s", TRUE },
  69         {"%s -p -C"      , "%s -Z -1 -- %s" , NULL          , TRUE },
  70         {"%s x -so"      , "%s l -- %s"     , NULL          , TRUE }
  71 };
  72
  73
  74 typedef struct _ComicsDocumentClass ComicsDocumentClass;
  75
  76 static void       comics_document_document_iface_init (EvDocumentIface *iface);
  77 static void       comics_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface);
  78
  79 static GSList*    get_supported_image_extensions (void);
  80 static void       get_page_size_area_prepared_cb (GdkPixbufLoader *loader,
  81                                                   gpointer data);
  82 static void       render_pixbuf_size_prepared_cb (GdkPixbufLoader *loader,
  83                                                   gint width,
  84                                                   gint height,
  85                                                   gpointer data);
  86 static char**     extract_argv                   (EvDocument *document,
  87                                                   gint page);
  88
  89
  90 EV_BACKEND_REGISTER_WITH_CODE (ComicsDocument, comics_document,
  91         {
  92                 EV_BACKEND_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_THUMBNAILS,
  93                                                 comics_document_document_thumbnails_iface_init);
  94         } );
  95
  96 static char *
  97 comics_regex_quote (const char *s)
  98 {
  99     char *ret, *d;
 100
 101     d = ret = g_malloc (strlen (s) * 4 + 3);
 102
 103     *d++ = '\'';
 104
 105     for (; *s; s++, d++) {
 106         switch (*s) {
 107         case '?':
 108         case '|':
 109         case '[':
 110         case ']':
 111         case '*':
 112         case '\\':
 113             *d++ = '\\';
 114             break;
 115         case '\'':
 116             *d++ = '\'';
 117             *d++ = '\\';
 118             *d++ = '\'';
 119             break;
 120         }
 121         *d = *s;
 122     }
 123
 124     *d++ = '\'';
 125     *d = '\0';
 126
 127     return ret;
 128 }
 129
 130 /* This function manages the command for decompressing a comic book */
 131 static gboolean
 132 comics_decompress_temp_dir (const gchar *command_decompress_tmp,
 133                             const gchar *command,
 134                             GError      **error)
 135 {
 136         gboolean success;
 137         gchar *std_out, *basename;
 138         GError *err = NULL;
 139         gint retval;
 140
 141         success = g_spawn_command_line_sync (command_decompress_tmp, &std_out,
 142                                              NULL, &retval, &err);
 143         basename = g_path_get_basename (command);
 144         if (!success) {
 145                 g_set_error (error,
 146                              EV_DOCUMENT_ERROR,
 147                              EV_DOCUMENT_ERROR_INVALID,
 148                              _("Error launching the command “%s” in order to "
 149                              "decompress the comic book: %s"),
 150                              basename,
 151                              err->message);
 152                 g_error_free (err);
 153         } else if (WIFEXITED (retval)) {
 154                 if (WEXITSTATUS (retval) == EXIT_SUCCESS) {
 155                         g_free (std_out);
 156                         g_free (basename);
 157                         return TRUE;
 158                 } else {
 159                         g_set_error (error,
 160                                      EV_DOCUMENT_ERROR,
 161                                      EV_DOCUMENT_ERROR_INVALID,
 162                                      _("The command “%s” failed at "
 163                                      "decompressing the comic book."),
 164                                      basename);
 165                         g_free (std_out);
 166                 }
 167         } else {
 168                 g_set_error (error,
 169                              EV_DOCUMENT_ERROR,
 170                              EV_DOCUMENT_ERROR_INVALID,
 171                              _("The command “%s” did not end normally."),
 172                              basename);
 173                 g_free (std_out);
 174         }
 175         g_free (basename);
 176         return FALSE;
 177 }
 178
 179 /* This function shows how to use the choosen command for decompressing a
 180  * comic book file. It modifies fields of the ComicsDocument struct with
 181  * this information */
 182 static gboolean
 183 comics_generate_command_lines (ComicsDocument *comics_document,
 184                                GError         **error)
 185 {
 186         gchar *quoted_file;
 187         ComicBookDecompressType type;
 188
 189         type = comics_document->command_usage;
 190         quoted_file = g_shell_quote (comics_document->archive);
 191
 192         comics_document->extract_command =
 193                             g_strdup_printf (command_usage_def[type].extract,
 194                                              comics_document->selected_command);
 195         comics_document->list_command =
 196                             g_strdup_printf (command_usage_def[type].list,
 197                                              comics_document->selected_command,
 198                                              quoted_file);
 199         comics_document->regex_arg = command_usage_def[type].regex_arg;
 200         if (command_usage_def[type].decompress_tmp) {
 201                 comics_document->dir = ev_tmp_directory (NULL);
 202                 comics_document->decompress_tmp =
 203                         g_strdup_printf (command_usage_def[type].decompress_tmp,
 204                                          comics_document->selected_command,
 205                                          quoted_file,
 206                                          comics_document->dir);
 207                 g_free (quoted_file);
 208                 /* unrar-free can't create directories so we do it on its
 209                  * behalf */
 210                 if (type == GNAUNRAR) {
 211                         if (g_mkdir_with_parents (comics_document->dir, 0700) !=
 212                             0) {
 213                                 int errsv = errno;
 214                                 g_set_error (error,
 215                                              EV_DOCUMENT_ERROR,
 216                                              EV_DOCUMENT_ERROR_INVALID,
 217                                              _("Failed to create a temporary "
 218                                              "directory."));
 219                                 g_warning ("Failed to create directory %s: %s",
 220                                            comics_document->dir,
 221                                            g_strerror (errsv));
 222
 223                                 return FALSE;
 224                         }
 225                 }
 226                 if (!comics_decompress_temp_dir (comics_document->decompress_tmp,
 227                     comics_document->selected_command, error))
 228                         return FALSE;
 229                 else
 230                         return TRUE;
 231         } else {
 232                 g_free (quoted_file);
 233                 return TRUE;
 234         }
 235
 236 }
 237
 238 /* This function chooses an external command for decompressing a comic
 239  * book based on its mime tipe. */
 240 static gboolean
 241 comics_check_decompress_command (gchar          *mime_type,
 242                                  ComicsDocument *comics_document,
 243                                  GError         **error)
 244 {
 245         gboolean success;
 246         gchar *std_out, *std_err;
 247         gint retval;
 248         GError *err = NULL;
 249
 250         /* FIXME, use proper cbr/cbz mime types once they're
 251          * included in shared-mime-info */
 252
 253         if (!strcmp (mime_type, "application/x-cbr") ||
 254             !strcmp (mime_type, "application/x-rar")) {
 255                 /* The RARLAB provides a no-charge proprietary (freeware)
 256                 * decompress-only client for Linux called unrar. Another
 257                 * option is a GPLv2-licensed command-line tool developed by
 258                 * the Gna! project. Confusingly enough, the free software RAR
 259                 * decoder is also named unrar. For this reason we need to add
 260                 * some lines for disambiguation. Sorry for the added the
 261                 * complexity but it's life :)
 262                 * Finally, some distributions, like Debian, rename this free
 263                 * option as unrar-free.
 264                 * */
 265                 comics_document->selected_command =
 266                                         g_find_program_in_path ("unrar");
 267                 if (comics_document->selected_command) {
 268                         /* We only use std_err to avoid printing useless error
 269                          * messages on the terminal */
 270                         success =
 271                                 g_spawn_command_line_sync (
 272                                               comics_document->selected_command,
 273                                                            &std_out, &std_err,
 274                                                            &retval, &err);
 275                         if (!success) {
 276                                 g_propagate_error (error, err);
 277                                 g_error_free (err);
 278                                 return FALSE;
 279                         /* I don't check retval status because RARLAB unrar
 280                          * doesn't have a way to return 0 without involving an
 281                          * operation with a file*/
 282                         } else if (WIFEXITED (retval)) {
 283                                 if (g_strrstr (std_out,"freeware") != NULL)
 284                                         /* The RARLAB freeware client */
 285                                         comics_document->command_usage = RARLABS;
 286                                 else
 287                                         /* The Gna! free software client */
 288                                         comics_document->command_usage = GNAUNRAR;
 289
 290                                 g_free (std_out);
 291                                 g_free (std_err);
 292                                 return TRUE;
 293                         }
 294                 }
 295                 /* The Gna! free software client with Debian naming convention */
 296                 comics_document->selected_command =
 297                                 g_find_program_in_path ("unrar-free");
 298                 if (comics_document->selected_command) {
 299                         comics_document->command_usage = GNAUNRAR;
 300                         return TRUE;
 301                 }
 302
 303         } else if (!strcmp (mime_type, "application/x-cbz") ||
 304                    !strcmp (mime_type, "application/zip")) {
 305                 /* InfoZIP's unzip program */
 306                 comics_document->selected_command =
 307                                 g_find_program_in_path ("unzip");
 308                 if (comics_document->selected_command) {
 309                         comics_document->command_usage = UNZIP;
 310                         return TRUE;
 311                 }
 312
 313         } else if (!strcmp (mime_type, "application/x-cb7") ||
 314                    !strcmp (mime_type, "application/x-7z-compressed")) {
 315                 /* 7zr is a light stand-alone executable that supports only
 316                  * 7z/LZMA/BCJ */
 317                         comics_document->selected_command =
 318                                 g_find_program_in_path ("7zr");
 319                         if (comics_document->selected_command) {
 320                                 comics_document->command_usage = P7ZIP;
 321                                 return TRUE;
 322                         }
 323         } else {
 324                 g_set_error (error,
 325                              EV_DOCUMENT_ERROR,
 326                              EV_DOCUMENT_ERROR_INVALID,
 327                              _("Not a comic book MIME type: %s"),
 328                              mime_type);
 329                              return FALSE;
 330         }
 331         g_set_error_literal (error,
 332                              EV_DOCUMENT_ERROR,
 333                              EV_DOCUMENT_ERROR_INVALID,
 334                              _("Can't find an appropiate command to "
 335                              "decompress this type of comic book"));
 336         return FALSE;
 337 }
 338
 339 static gboolean
 340 comics_document_load (EvDocument *document,
 341                       const char *uri,
 342                       GError    **error)
 343 {
 344         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 345         GSList *supported_extensions;
 346         gchar *std_out;
 347         gchar *mime_type;
 348         gchar **cbr_files;
 349         gboolean success;
 350         int i, retval;
 351         GError *err = NULL;
 352
 353         comics_document->archive = g_filename_from_uri (uri, NULL, error);
 354         if (!comics_document->archive)
 355                 return FALSE;
 356
 357         mime_type = ev_file_get_mime_type (uri, FALSE, &err);
 358         if (!mime_type) {
 359                 if (err) {
 360                         g_propagate_error (error, err);
 361                 } else {
 362                         g_set_error_literal (error,
 363                                              EV_DOCUMENT_ERROR,
 364                                              EV_DOCUMENT_ERROR_INVALID,
 365                                              _("Unknown MIME Type"));
 366                 }
 367
 368                 return FALSE;
 369         }
 370
 371         if (!comics_check_decompress_command (mime_type, comics_document,
 372         error)) {
 373                 g_free (mime_type);
 374                 return FALSE;
 375         } else if (!comics_generate_command_lines (comics_document, error)) {
 376                    g_free (mime_type);
 377                 return FALSE;
 378         }
 379
 380         g_free (mime_type);
 381
 382         /* Get list of files in archive */
 383         success = g_spawn_command_line_sync (comics_document->list_command,
 384                                              &std_out, NULL, &retval, error);
 385
 386         if (!success) {
 387                 return FALSE;
 388         } else if (!WIFEXITED(retval) || WEXITSTATUS(retval) != EXIT_SUCCESS) {
 389                 g_set_error_literal (error,
 390                                      EV_DOCUMENT_ERROR,
 391                                      EV_DOCUMENT_ERROR_INVALID,
 392                                      _("File corrupted"));
 393                 return FALSE;
 394         }
 395
 396         /* FIXME: is this safe against filenames containing \n in the archive ? */
 397         cbr_files = g_strsplit (std_out, "\n", 0);
 398         g_free (std_out);
 399
 400         if (!cbr_files) {
 401                 g_set_error_literal (error,
 402                                      EV_DOCUMENT_ERROR,
 403                                      EV_DOCUMENT_ERROR_INVALID,
 404                                      _("No files in archive"));
 405                 return FALSE;
 406         }
 407
 408         supported_extensions = get_supported_image_extensions ();
 409         for (i = 0; cbr_files[i] != NULL; i++) {
 410                 gchar *suffix = g_strrstr (cbr_files[i], ".");
 411                 if (!suffix)
 412                         continue;
 413                 suffix = g_ascii_strdown (suffix + 1, -1);
 414
 415                 if (g_slist_find_custom (supported_extensions, suffix,
 416                                          (GCompareFunc) strcmp) != NULL) {
 417                         comics_document->page_names =
 418                                 g_slist_insert_sorted (
 419                                         comics_document->page_names,
 420                                         g_strdup (g_strstrip (cbr_files[i])),
 421                                         (GCompareFunc) strcmp);
 422                         comics_document->n_pages++;
 423                 }
 424
 425                 g_free (suffix);
 426         }
 427
 428         g_strfreev (cbr_files);
 429         g_slist_foreach (supported_extensions, (GFunc) g_free, NULL);
 430         g_slist_free (supported_extensions);
 431
 432         if (comics_document->n_pages == 0) {
 433                 g_set_error (error,
 434                              EV_DOCUMENT_ERROR,
 435                              EV_DOCUMENT_ERROR_INVALID,
 436                              _("No images found in archive %s"),
 437                              uri);
 438                 return FALSE;
 439         }
 440
 441         return TRUE;
 442 }
 443
 444
 445 static gboolean
 446 comics_document_save (EvDocument *document,
 447                       const char *uri,
 448                       GError    **error)
 449 {
 450         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 451
 452         return ev_xfer_uri_simple (comics_document->archive, uri, error);
 453 }
 454
 455 static int
 456 comics_document_get_n_pages (EvDocument *document)
 457 {
 458         return COMICS_DOCUMENT (document)->n_pages;
 459 }
 460
 461 static void
 462 comics_document_get_page_size (EvDocument *document,
 463                                EvPage     *page,
 464                                double     *width,
 465                                double     *height)
 466 {
 467         GdkPixbufLoader *loader;
 468         char **argv;
 469         guchar buf[1024];
 470         gboolean success, got_size = FALSE;
 471         gint outpipe = -1;
 472         GPid child_pid = -1;
 473         gssize bytes;
 474         GdkPixbuf *pixbuf;
 475         gchar *filename;
 476         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 477
 478         if (!comics_document->decompress_tmp) {
 479                 argv = extract_argv (document, page->index);
 480                 success = g_spawn_async_with_pipes (NULL, argv, NULL,
 481                                                     G_SPAWN_SEARCH_PATH |
 482                                                     G_SPAWN_STDERR_TO_DEV_NULL,
 483                                                     NULL, NULL,
 484                                                     &child_pid,
 485                                                     NULL, &outpipe, NULL, NULL);
 486                 g_strfreev (argv);
 487                 g_return_if_fail (success == TRUE);
 488
 489                 loader = gdk_pixbuf_loader_new ();
 490                 g_signal_connect (loader, "area-prepared",
 491                                   G_CALLBACK (get_page_size_area_prepared_cb),
 492                                   &got_size);
 493
 494                 while (outpipe >= 0) {
 495                         bytes = read (outpipe, buf, 1024);
 496
 497                         if (bytes > 0)
 498                         gdk_pixbuf_loader_write (loader, buf, bytes, NULL);
 499                         if (bytes <= 0 || got_size) {
 500                                 close (outpipe);
 501                                 outpipe = -1;
 502                                 gdk_pixbuf_loader_close (loader, NULL);
 503                         }
 504                 }
 505
 506                 if (gdk_pixbuf_loader_get_pixbuf (loader)) {
 507                         pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
 508                         if (width)
 509                                 *width = gdk_pixbuf_get_width (pixbuf);
 510                         if (height)
 511                                 *height = gdk_pixbuf_get_height (pixbuf);
 512                 }
 513
 514                 g_spawn_close_pid (child_pid);
 515                 g_object_unref (loader);
 516         } else {
 517                 filename = g_build_filename (comics_document->dir,
 518                                              (char*) g_slist_nth_data (
 519                                              comics_document->page_names,
 520                                              page->index),
 521                                              NULL);
 522                 pixbuf = gdk_pixbuf_new_from_file (filename, NULL);
 523                 g_free (filename);
 524                 if (width)
 525                         *width = gdk_pixbuf_get_width (pixbuf);
 526                 if (height)
 527                         *height = gdk_pixbuf_get_height (pixbuf);
 528         }
 529 }
 530
 531 static void
 532 get_page_size_area_prepared_cb (GdkPixbufLoader *loader,
 533                                 gpointer         data)
 534 {
 535         gboolean *got_size = data;
 536         *got_size = TRUE;
 537 }
 538
 539 static GdkPixbuf *
 540 comics_document_render_pixbuf (EvDocument      *document,
 541                                EvRenderContext *rc)
 542 {
 543         GdkPixbufLoader *loader;
 544         GdkPixbuf *rotated_pixbuf;
 545         char **argv;
 546         guchar buf[4096];
 547         gboolean success;
 548         gint outpipe = -1;
 549         GPid child_pid = -1;
 550         gssize bytes;
 551         gint width, height;
 552         gchar *filename;
 553         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 554
 555         if (!comics_document->decompress_tmp) {
 556                 argv = extract_argv (document, rc->page->index);
 557                 success = g_spawn_async_with_pipes (NULL, argv, NULL,
 558                                                     G_SPAWN_SEARCH_PATH |
 559                                                     G_SPAWN_STDERR_TO_DEV_NULL,
 560                                                     NULL, NULL,
 561                                                     &child_pid,
 562                                                     NULL, &outpipe, NULL, NULL);
 563                 g_strfreev (argv);
 564                 g_return_val_if_fail (success == TRUE, NULL);
 565
 566                 loader = gdk_pixbuf_loader_new ();
 567                 g_signal_connect (loader, "size-prepared",
 568                                   G_CALLBACK (render_pixbuf_size_prepared_cb),
 569                                   &rc->scale);
 570
 571                 while (outpipe >= 0) {
 572                         bytes = read (outpipe, buf, 4096);
 573
 574                         if (bytes > 0) {
 575                                 gdk_pixbuf_loader_write (loader, buf, bytes,
 576                                 NULL);
 577                         } else if (bytes <= 0) {
 578                                 close (outpipe);
 579                                 gdk_pixbuf_loader_close (loader, NULL);
 580                                 outpipe = -1;
 581                         }
 582                 }
 583
 584                 rotated_pixbuf = gdk_pixbuf_rotate_simple (
 585                                         gdk_pixbuf_loader_get_pixbuf (loader),
 586                                         360 - rc->rotation);
 587                 g_spawn_close_pid (child_pid);
 588                 g_object_unref (loader);
 589         } else {
 590                 filename =
 591                         g_build_filename (comics_document->dir,
 592                                           (char*) g_slist_nth_data (
 593                                                 comics_document->page_names,
 594                                                 rc->page->index),
 595                                           NULL);
 596
 597                 gdk_pixbuf_get_file_info (filename, &width, &height);
 598
 599                 rotated_pixbuf =
 600                   gdk_pixbuf_rotate_simple (gdk_pixbuf_new_from_file_at_size (
 601                                             filename, width * (rc->scale) + 0.5,
 602                                             height * (rc->scale) + 0.5, NULL),
 603                                             360 - rc->rotation);
 604                 g_free (filename);
 605
 606         }
 607         return rotated_pixbuf;
 608 }
 609
 610 static cairo_surface_t *
 611 comics_document_render (EvDocument      *document,
 612                         EvRenderContext *rc)
 613 {
 614         GdkPixbuf       *pixbuf;
 615         cairo_surface_t *surface;
 616
 617         pixbuf = comics_document_render_pixbuf (document, rc);
 618         surface = ev_document_misc_surface_from_pixbuf (pixbuf);
 619         g_object_unref (pixbuf);
 620
 621         return surface;
 622 }
 623
 624 static void
 625 render_pixbuf_size_prepared_cb (GdkPixbufLoader *loader,
 626                                 gint             width,
 627                                 gint             height,
 628                                 gpointer         data)
 629 {
 630         double *scale = data;
 631         int w = (width  * (*scale) + 0.5);
 632         int h = (height * (*scale) + 0.5);
 633
 634         gdk_pixbuf_loader_set_size (loader, w, h);
 635 }
 636
 637 /**
 638  * comics_remove_dir: Removes a directory recursively.
 639  * Returns:
 640  *      0 if it was successfully deleted,
 641  *      -1 if an error occurred
 642  */
 643 static int
 644 comics_remove_dir (gchar *path_name)
 645 {
 646         GDir  *content_dir;
 647         const gchar *filename;
 648         gchar *filename_with_path;
 649
 650         if (g_file_test (path_name, G_FILE_TEST_IS_DIR)) {
 651                 content_dir = g_dir_open  (path_name, 0, NULL);
 652                 filename  = g_dir_read_name (content_dir);
 653                 while (filename) {
 654                         filename_with_path =
 655                                 g_build_filename (path_name,
 656                                                   filename, NULL);
 657                         comics_remove_dir (filename_with_path);
 658                         g_free (filename_with_path);
 659                         filename = g_dir_read_name (content_dir);
 660                 }
 661                 g_dir_close (content_dir);
 662         }
 663         /* Note from g_remove() documentation: on Windows, it is in general not
 664          * possible to remove a file that is open to some process, or mapped
 665          * into memory.*/
 666         return (g_remove (path_name));
 667 }
 668
 669 static void
 670 comics_document_finalize (GObject *object)
 671 {
 672         ComicsDocument *comics_document = COMICS_DOCUMENT (object);
 673
 674         if (comics_document->decompress_tmp) {
 675                 if (comics_remove_dir (comics_document->dir) == -1)
 676                         g_warning (_("There was an error deleting “%s”."),
 677                                    comics_document->dir);
 678                 g_free (comics_document->dir);
 679                 g_remove (ev_tmp_dir ());
 680         }
 681
 682         if (comics_document->page_names) {
 683                 g_slist_foreach (comics_document->page_names,
 684                                  (GFunc) g_free, NULL);
 685                 g_slist_free (comics_document->page_names);
 686         }
 687
 688         g_free (comics_document->archive);
 689         g_free (comics_document->selected_command);
 690         g_free (comics_document->extract_command);
 691         g_free (comics_document->list_command);
 692
 693         G_OBJECT_CLASS (comics_document_parent_class)->finalize (object);
 694 }
 695
 696 static void
 697 comics_document_class_init (ComicsDocumentClass *klass)
 698 {
 699         GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 700         gobject_class->finalize = comics_document_finalize;
 701 }
 702
 703 static EvDocumentInfo *
 704 comics_document_get_info (EvDocument *document)
 705 {
 706         EvDocumentInfo *info;
 707         info = g_new0 (EvDocumentInfo, 1);
 708         return info;
 709 }
 710
 711 static void
 712 comics_document_document_iface_init (EvDocumentIface *iface)
 713 {
 714         iface->load = comics_document_load;
 715         iface->save = comics_document_save;
 716         iface->get_n_pages = comics_document_get_n_pages;
 717         iface->get_page_size = comics_document_get_page_size;
 718         iface->render = comics_document_render;
 719         iface->get_info = comics_document_get_info;
 720 }
 721
 722 static void
 723 comics_document_init (ComicsDocument *comics_document)
 724 {
 725         comics_document->archive = NULL;
 726         comics_document->page_names = NULL;
 727         comics_document->extract_command = NULL;
 728         comics_document->n_pages = 0;
 729 }
 730
 731 /* Returns a list of file extensions supported by gdk-pixbuf */
 732 static GSList*
 733 get_supported_image_extensions()
 734 {
 735         GSList *extensions = NULL;
 736         GSList *formats = gdk_pixbuf_get_formats ();
 737         GSList *l;
 738
 739         for (l = formats; l != NULL; l = l->next) {
 740                 int i;
 741                 gchar **ext = gdk_pixbuf_format_get_extensions (l->data);
 742
 743                 for (i = 0; ext[i] != NULL; i++) {
 744                         extensions = g_slist_append (extensions,
 745                                                      g_strdup (ext[i]));
 746                 }
 747
 748                 g_strfreev (ext);
 749         }
 750
 751         g_slist_free (formats);
 752         return extensions;
 753 }
 754
 755 static GdkPixbuf *
 756 comics_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document,
 757                                           EvRenderContext      *rc,
 758                                           gboolean              border)
 759 {
 760         GdkPixbuf *thumbnail;
 761
 762         thumbnail = comics_document_render_pixbuf (EV_DOCUMENT (document), rc);
 763
 764         if (border) {
 765               GdkPixbuf *tmp_pixbuf = thumbnail;
 766
 767               thumbnail = ev_document_misc_get_thumbnail_frame (-1, -1, tmp_pixbuf);
 768               g_object_unref (tmp_pixbuf);
 769         }
 770
 771         return thumbnail;
 772 }
 773
 774 static void
 775 comics_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 776                                            EvRenderContext      *rc,
 777                                            gint                 *width,
 778                                            gint                 *height)
 779 {
 780         gdouble page_width, page_height;
 781
 782         comics_document_get_page_size (EV_DOCUMENT (document), rc->page,
 783                                        &page_width, &page_height);
 784
 785         if (rc->rotation == 90 || rc->rotation == 270) {
 786                 *width = (gint) (page_height * rc->scale);
 787                 *height = (gint) (page_width * rc->scale);
 788         } else {
 789                 *width = (gint) (page_width * rc->scale);
 790                 *height = (gint) (page_height * rc->scale);
 791         }
 792 }
 793
 794 static void
 795 comics_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
 796 {
 797         iface->get_thumbnail = comics_document_thumbnails_get_thumbnail;
 798         iface->get_dimensions = comics_document_thumbnails_get_dimensions;
 799 }
 800
 801 static char**
 802 extract_argv (EvDocument *document, gint page)
 803 {
 804         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 805         char **argv;
 806         char *command_line, *quoted_archive, *quoted_filename;
 807         GError *err = NULL;
 808
 809         quoted_archive = g_shell_quote (comics_document->archive);
 810         if (comics_document->regex_arg) {
 811                 quoted_filename = comics_regex_quote (
 812                         g_slist_nth_data (comics_document->page_names, page));
 813         } else {
 814                 quoted_filename = g_shell_quote (
 815                         g_slist_nth_data (comics_document->page_names, page));
 816         }
 817
 818         command_line = g_strdup_printf ("%s -- %s %s",
 819                                         comics_document->extract_command,
 820                                         quoted_archive,
 821                                         quoted_filename);
 822
 823         g_shell_parse_argv (command_line, NULL, &argv, &err);
 824
 825         if (err) {
 826                 g_warning (_("Error %s"), err->message);
 827                 g_error_free (err);
 828                 return NULL;
 829         }
 830
 831         g_free (command_line);
 832         g_free (quoted_archive);
 833         g_free (quoted_filename);
 834         return argv;
 835 }