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         EvDocumentClass parent_class;
  40 };
  41
  42 typedef enum
  43 {
  44         RARLABS,
  45         GNAUNRAR,
  46         UNZIP,
  47         P7ZIP
  48 } ComicBookDecompressType;
  49
  50 struct _ComicsDocument
  51 {
  52         EvDocument parent_instance;
  53
  54         gchar    *archive, *dir;
  55         GPtrArray *page_names;
  56         gchar    *selected_command;
  57         gchar    *extract_command, *list_command, *decompress_tmp;
  58         gboolean regex_arg;
  59         gint     offset;
  60         ComicBookDecompressType command_usage;
  61 };
  62
  63 #define OFFSET_7Z 53
  64 #define NO_OFFSET 0
  65
  66 /* For perfomance reasons of 7z* we've choosen to decompress on the temporary
  67  * directory instead of decompressing on the stdout */
  68
  69 struct {
  70         char *extract, *list, *decompress_tmp;
  71         gboolean regex_arg;
  72         gint offset;
  73 } command_usage_def[] = {
  74         {"%s p -c- -ierr", "%s vb -c- -- %s", NULL             , FALSE, NO_OFFSET},
  75         {NULL            , "%s t %s"        , "%s -xf %s %s"   , TRUE , NO_OFFSET},
  76         {"%s -p -C"      , "%s -Z -1 -- %s" , NULL             , TRUE , NO_OFFSET},
  77         {NULL            , "%s l -- %s"     , "%s x -y %s -o%s", FALSE, OFFSET_7Z}
  78 };
  79
  80
  81 typedef struct    _ComicsDocumentClass ComicsDocumentClass;
  82
  83 static void       comics_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface);
  84
  85 static GSList*    get_supported_image_extensions (void);
  86 static void       get_page_size_area_prepared_cb (GdkPixbufLoader *loader,
  87                                                   gpointer data);
  88 static void       render_pixbuf_size_prepared_cb (GdkPixbufLoader *loader,
  89                                                   gint width,
  90                                                   gint height,
  91                                                   gpointer data);
  92 static char**     extract_argv                   (EvDocument *document,
  93                                                   gint page);
  94
  95
  96 EV_BACKEND_REGISTER_WITH_CODE (ComicsDocument, comics_document,
  97         {
  98                 EV_BACKEND_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_THUMBNAILS,
  99                                                 comics_document_document_thumbnails_iface_init);
 100         } );
 101
 102 static char *
 103 comics_regex_quote (const char *s)
 104 {
 105     char *ret, *d;
 106
 107     d = ret = g_malloc (strlen (s) * 4 + 3);
 108
 109     *d++ = '\'';
 110
 111     for (; *s; s++, d++) {
 112         switch (*s) {
 113         case '?':
 114         case '|':
 115         case '[':
 116         case ']':
 117         case '*':
 118         case '\\':
 119             *d++ = '\\';
 120             break;
 121         case '\'':
 122             *d++ = '\'';
 123             *d++ = '\\';
 124             *d++ = '\'';
 125             break;
 126         }
 127         *d = *s;
 128     }
 129
 130     *d++ = '\'';
 131     *d = '\0';
 132
 133     return ret;
 134 }
 135
 136 /* This function manages the command for decompressing a comic book */
 137 static gboolean
 138 comics_decompress_temp_dir (const gchar *command_decompress_tmp,
 139                             const gchar *command,
 140                             GError      **error)
 141 {
 142         gboolean success;
 143         gchar *std_out, *basename;
 144         GError *err = NULL;
 145         gint retval;
 146
 147         success = g_spawn_command_line_sync (command_decompress_tmp, &std_out,
 148                                              NULL, &retval, &err);
 149         basename = g_path_get_basename (command);
 150         if (!success) {
 151                 g_set_error (error,
 152                              EV_DOCUMENT_ERROR,
 153                              EV_DOCUMENT_ERROR_INVALID,
 154                              _("Error launching the command “%s” in order to "
 155                              "decompress the comic book: %s"),
 156                              basename,
 157                              err->message);
 158                 g_error_free (err);
 159         } else if (WIFEXITED (retval)) {
 160                 if (WEXITSTATUS (retval) == EXIT_SUCCESS) {
 161                         g_free (std_out);
 162                         g_free (basename);
 163                         return TRUE;
 164                 } else {
 165                         g_set_error (error,
 166                                      EV_DOCUMENT_ERROR,
 167                                      EV_DOCUMENT_ERROR_INVALID,
 168                                      _("The command “%s” failed at "
 169                                      "decompressing the comic book."),
 170                                      basename);
 171                         g_free (std_out);
 172                 }
 173         } else {
 174                 g_set_error (error,
 175                              EV_DOCUMENT_ERROR,
 176                              EV_DOCUMENT_ERROR_INVALID,
 177                              _("The command “%s” did not end normally."),
 178                              basename);
 179                 g_free (std_out);
 180         }
 181         g_free (basename);
 182         return FALSE;
 183 }
 184
 185 /* This function shows how to use the choosen command for decompressing a
 186  * comic book file. It modifies fields of the ComicsDocument struct with
 187  * this information */
 188 static gboolean
 189 comics_generate_command_lines (ComicsDocument *comics_document,
 190                                GError         **error)
 191 {
 192         gchar *quoted_file;
 193         ComicBookDecompressType type;
 194
 195         type = comics_document->command_usage;
 196         quoted_file = g_shell_quote (comics_document->archive);
 197
 198         comics_document->extract_command =
 199                             g_strdup_printf (command_usage_def[type].extract,
 200                                              comics_document->selected_command);
 201         comics_document->list_command =
 202                             g_strdup_printf (command_usage_def[type].list,
 203                                              comics_document->selected_command,
 204                                              quoted_file);
 205         comics_document->regex_arg = command_usage_def[type].regex_arg;
 206         comics_document->offset = command_usage_def[type].offset;
 207         if (command_usage_def[type].decompress_tmp) {
 208                 comics_document->dir = ev_mkdtemp ("comics.XXXXXX", error);
 209                 if (comics_document->dir == NULL)
 210                         return FALSE;
 211
 212                 /* unrar-free can't create directories, but ev_mkdtemp already created the dir */
 213
 214                 comics_document->decompress_tmp =
 215                         g_strdup_printf (command_usage_def[type].decompress_tmp,
 216                                          comics_document->selected_command,
 217                                          quoted_file,
 218                                          comics_document->dir);
 219                 g_free (quoted_file);
 220
 221                 if (!comics_decompress_temp_dir (comics_document->decompress_tmp,
 222                     comics_document->selected_command, error))
 223                         return FALSE;
 224                 else
 225                         return TRUE;
 226         } else {
 227                 g_free (quoted_file);
 228                 return TRUE;
 229         }
 230
 231 }
 232
 233 /* This function chooses an external command for decompressing a comic
 234  * book based on its mime tipe. */
 235 static gboolean
 236 comics_check_decompress_command (gchar          *mime_type,
 237                                  ComicsDocument *comics_document,
 238                                  GError         **error)
 239 {
 240         gboolean success;
 241         gchar *std_out, *std_err;
 242         gint retval;
 243         GError *err = NULL;
 244
 245         /* FIXME, use proper cbr/cbz mime types once they're
 246          * included in shared-mime-info */
 247
 248         if (!strcmp (mime_type, "application/x-cbr") ||
 249             !strcmp (mime_type, "application/x-rar")) {
 250                 /* The RARLAB provides a no-charge proprietary (freeware)
 251                 * decompress-only client for Linux called unrar. Another
 252                 * option is a GPLv2-licensed command-line tool developed by
 253                 * the Gna! project. Confusingly enough, the free software RAR
 254                 * decoder is also named unrar. For this reason we need to add
 255                 * some lines for disambiguation. Sorry for the added the
 256                 * complexity but it's life :)
 257                 * Finally, some distributions, like Debian, rename this free
 258                 * option as unrar-free.
 259                 * */
 260                 comics_document->selected_command =
 261                                         g_find_program_in_path ("unrar");
 262                 if (comics_document->selected_command) {
 263                         /* We only use std_err to avoid printing useless error
 264                          * messages on the terminal */
 265                         success =
 266                                 g_spawn_command_line_sync (
 267                                               comics_document->selected_command,
 268                                                            &std_out, &std_err,
 269                                                            &retval, &err);
 270                         if (!success) {
 271                                 g_propagate_error (error, err);
 272                                 g_error_free (err);
 273                                 return FALSE;
 274                         /* I don't check retval status because RARLAB unrar
 275                          * doesn't have a way to return 0 without involving an
 276                          * operation with a file*/
 277                         } else if (WIFEXITED (retval)) {
 278                                 if (g_strrstr (std_out,"freeware") != NULL)
 279                                         /* The RARLAB freeware client */
 280                                         comics_document->command_usage = RARLABS;
 281                                 else
 282                                         /* The Gna! free software client */
 283                                         comics_document->command_usage = GNAUNRAR;
 284
 285                                 g_free (std_out);
 286                                 g_free (std_err);
 287                                 return TRUE;
 288                         }
 289                 }
 290                 /* The Gna! free software client with Debian naming convention */
 291                 comics_document->selected_command =
 292                                 g_find_program_in_path ("unrar-free");
 293                 if (comics_document->selected_command) {
 294                         comics_document->command_usage = GNAUNRAR;
 295                         return TRUE;
 296                 }
 297
 298         } else if (!strcmp (mime_type, "application/x-cbz") ||
 299                    !strcmp (mime_type, "application/zip")) {
 300                 /* InfoZIP's unzip program */
 301                 comics_document->selected_command =
 302                                 g_find_program_in_path ("unzip");
 303                 if (comics_document->selected_command) {
 304                         comics_document->command_usage = UNZIP;
 305                         return TRUE;
 306                 }
 307
 308         } else if (!strcmp (mime_type, "application/x-cb7") ||
 309                    !strcmp (mime_type, "application/x-7z-compressed")) {
 310                 /* 7zr, 7za and 7z are the commands from the p7zip project able
 311                  * to decompress .7z files */
 312                         comics_document->selected_command =
 313                                 g_find_program_in_path ("7zr");
 314                         if (comics_document->selected_command) {
 315                                 comics_document->command_usage = P7ZIP;
 316                                 return TRUE;
 317                         }
 318                         comics_document->selected_command =
 319                                 g_find_program_in_path ("7za");
 320                         if (comics_document->selected_command) {
 321                                 comics_document->command_usage = P7ZIP;
 322                                 return TRUE;
 323                         }
 324                         comics_document->selected_command =
 325                                 g_find_program_in_path ("7z");
 326                         if (comics_document->selected_command) {
 327                                 comics_document->command_usage = P7ZIP;
 328                                 return TRUE;
 329                         }
 330         } else {
 331                 g_set_error (error,
 332                              EV_DOCUMENT_ERROR,
 333                              EV_DOCUMENT_ERROR_INVALID,
 334                              _("Not a comic book MIME type: %s"),
 335                              mime_type);
 336                              return FALSE;
 337         }
 338         g_set_error_literal (error,
 339                              EV_DOCUMENT_ERROR,
 340                              EV_DOCUMENT_ERROR_INVALID,
 341                              _("Can't find an appropriate command to "
 342                              "decompress this type of comic book"));
 343         return FALSE;
 344 }
 345
 346 static int
 347 sort_page_names (gconstpointer a,
 348                  gconstpointer b)
 349 {
 350   return strcmp (* (const char **) a, * (const char **) b);
 351 }
 352
 353 static gboolean
 354 comics_document_load (EvDocument *document,
 355                       const char *uri,
 356                       GError    **error)
 357 {
 358         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 359         GSList *supported_extensions;
 360         gchar *std_out;
 361         gchar *mime_type;
 362         gchar **cb_files, *cb_file;
 363         gboolean success;
 364         int i, retval;
 365         GError *err = NULL;
 366
 367         comics_document->archive = g_filename_from_uri (uri, NULL, error);
 368         if (!comics_document->archive)
 369                 return FALSE;
 370
 371         mime_type = ev_file_get_mime_type (uri, FALSE, &err);
 372         if (!mime_type) {
 373                 if (err) {
 374                         g_propagate_error (error, err);
 375                 } else {
 376                         g_set_error_literal (error,
 377                                              EV_DOCUMENT_ERROR,
 378                                              EV_DOCUMENT_ERROR_INVALID,
 379                                              _("Unknown MIME Type"));
 380                 }
 381
 382                 return FALSE;
 383         }
 384
 385         if (!comics_check_decompress_command (mime_type, comics_document,
 386         error)) {
 387                 g_free (mime_type);
 388                 return FALSE;
 389         } else if (!comics_generate_command_lines (comics_document, error)) {
 390                    g_free (mime_type);
 391                 return FALSE;
 392         }
 393
 394         g_free (mime_type);
 395
 396         /* Get list of files in archive */
 397         success = g_spawn_command_line_sync (comics_document->list_command,
 398                                              &std_out, NULL, &retval, error);
 399
 400         if (!success) {
 401                 return FALSE;
 402         } else if (!WIFEXITED(retval) || WEXITSTATUS(retval) != EXIT_SUCCESS) {
 403                 g_set_error_literal (error,
 404                                      EV_DOCUMENT_ERROR,
 405                                      EV_DOCUMENT_ERROR_INVALID,
 406                                      _("File corrupted"));
 407                 return FALSE;
 408         }
 409
 410         /* FIXME: is this safe against filenames containing \n in the archive ? */
 411         cb_files = g_strsplit (std_out, "\n", 0);
 412         g_free (std_out);
 413
 414         if (!cb_files) {
 415                 g_set_error_literal (error,
 416                                      EV_DOCUMENT_ERROR,
 417                                      EV_DOCUMENT_ERROR_INVALID,
 418                                      _("No files in archive"));
 419                 return FALSE;
 420         }
 421
 422         comics_document->page_names = g_ptr_array_sized_new (64);
 423
 424         supported_extensions = get_supported_image_extensions ();
 425         for (i = 0; cb_files[i] != NULL; i++) {
 426                 if (comics_document->offset != NO_OFFSET) {
 427                         if (g_utf8_strlen (cb_files[i],-1) >
 428                             comics_document->offset) {
 429                                 cb_file =
 430                                         g_utf8_offset_to_pointer (cb_files[i],
 431                                                        comics_document->offset);
 432                         } else {
 433                                 continue;
 434                         }
 435                 } else {
 436                         cb_file = cb_files[i];
 437                 }
 438                 gchar *suffix = g_strrstr (cb_file, ".");
 439                 if (!suffix)
 440                         continue;
 441                 suffix = g_ascii_strdown (suffix + 1, -1);
 442                 if (g_slist_find_custom (supported_extensions, suffix,
 443                                          (GCompareFunc) strcmp) != NULL) {
 444                         g_ptr_array_add (comics_document->page_names,
 445                                          g_strstrip (g_strdup (cb_file)));
 446                 }
 447                 g_free (suffix);
 448         }
 449         g_strfreev (cb_files);
 450         g_slist_foreach (supported_extensions, (GFunc) g_free, NULL);
 451         g_slist_free (supported_extensions);
 452
 453         if (comics_document->page_names->len == 0) {
 454                 g_set_error (error,
 455                              EV_DOCUMENT_ERROR,
 456                              EV_DOCUMENT_ERROR_INVALID,
 457                              _("No images found in archive %s"),
 458                              uri);
 459                 return FALSE;
 460         }
 461
 462         /* Now sort the pages */
 463         g_ptr_array_sort (comics_document->page_names, sort_page_names);
 464
 465         return TRUE;
 466 }
 467
 468
 469 static gboolean
 470 comics_document_save (EvDocument *document,
 471                       const char *uri,
 472                       GError    **error)
 473 {
 474         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 475
 476         return ev_xfer_uri_simple (comics_document->archive, uri, error);
 477 }
 478
 479 static int
 480 comics_document_get_n_pages (EvDocument *document)
 481 {
 482         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 483
 484         if (comics_document->page_names == NULL)
 485                 return 0;
 486
 487         return comics_document->page_names->len;
 488 }
 489
 490 static void
 491 comics_document_get_page_size (EvDocument *document,
 492                                EvPage     *page,
 493                                double     *width,
 494                                double     *height)
 495 {
 496         GdkPixbufLoader *loader;
 497         char **argv;
 498         guchar buf[1024];
 499         gboolean success, got_size = FALSE;
 500         gint outpipe = -1;
 501         GPid child_pid = -1;
 502         gssize bytes;
 503         GdkPixbuf *pixbuf;
 504         gchar *filename;
 505         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 506
 507         if (!comics_document->decompress_tmp) {
 508                 argv = extract_argv (document, page->index);
 509                 success = g_spawn_async_with_pipes (NULL, argv, NULL,
 510                                                     G_SPAWN_SEARCH_PATH |
 511                                                     G_SPAWN_STDERR_TO_DEV_NULL,
 512                                                     NULL, NULL,
 513                                                     &child_pid,
 514                                                     NULL, &outpipe, NULL, NULL);
 515                 g_strfreev (argv);
 516                 g_return_if_fail (success == TRUE);
 517
 518                 loader = gdk_pixbuf_loader_new ();
 519                 g_signal_connect (loader, "area-prepared",
 520                                   G_CALLBACK (get_page_size_area_prepared_cb),
 521                                   &got_size);
 522
 523                 while (outpipe >= 0) {
 524                         bytes = read (outpipe, buf, 1024);
 525
 526                         if (bytes > 0)
 527                         gdk_pixbuf_loader_write (loader, buf, bytes, NULL);
 528                         if (bytes <= 0 || got_size) {
 529                                 close (outpipe);
 530                                 outpipe = -1;
 531                                 gdk_pixbuf_loader_close (loader, NULL);
 532                         }
 533                 }
 534
 535                 if (gdk_pixbuf_loader_get_pixbuf (loader)) {
 536                         pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
 537                         if (width)
 538                                 *width = gdk_pixbuf_get_width (pixbuf);
 539                         if (height)
 540                                 *height = gdk_pixbuf_get_height (pixbuf);
 541                 }
 542
 543                 g_spawn_close_pid (child_pid);
 544                 g_object_unref (loader);
 545         } else {
 546                 filename = g_build_filename (comics_document->dir,
 547                                              (char *) comics_document->page_names->pdata[page->index],
 548                                              NULL);
 549                 pixbuf = gdk_pixbuf_new_from_file (filename, NULL);
 550                 g_free (filename);
 551                 if (width)
 552                         *width = gdk_pixbuf_get_width (pixbuf);
 553                 if (height)
 554                         *height = gdk_pixbuf_get_height (pixbuf);
 555         }
 556 }
 557
 558 static void
 559 get_page_size_area_prepared_cb (GdkPixbufLoader *loader,
 560                                 gpointer         data)
 561 {
 562         gboolean *got_size = data;
 563         *got_size = TRUE;
 564 }
 565
 566 static GdkPixbuf *
 567 comics_document_render_pixbuf (EvDocument      *document,
 568                                EvRenderContext *rc)
 569 {
 570         GdkPixbufLoader *loader;
 571         GdkPixbuf *rotated_pixbuf;
 572         char **argv;
 573         guchar buf[4096];
 574         gboolean success;
 575         gint outpipe = -1;
 576         GPid child_pid = -1;
 577         gssize bytes;
 578         gint width, height;
 579         gchar *filename;
 580         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 581
 582         if (!comics_document->decompress_tmp) {
 583                 argv = extract_argv (document, rc->page->index);
 584                 success = g_spawn_async_with_pipes (NULL, argv, NULL,
 585                                                     G_SPAWN_SEARCH_PATH |
 586                                                     G_SPAWN_STDERR_TO_DEV_NULL,
 587                                                     NULL, NULL,
 588                                                     &child_pid,
 589                                                     NULL, &outpipe, NULL, NULL);
 590                 g_strfreev (argv);
 591                 g_return_val_if_fail (success == TRUE, NULL);
 592
 593                 loader = gdk_pixbuf_loader_new ();
 594                 g_signal_connect (loader, "size-prepared",
 595                                   G_CALLBACK (render_pixbuf_size_prepared_cb),
 596                                   &rc->scale);
 597
 598                 while (outpipe >= 0) {
 599                         bytes = read (outpipe, buf, 4096);
 600
 601                         if (bytes > 0) {
 602                                 gdk_pixbuf_loader_write (loader, buf, bytes,
 603                                 NULL);
 604                         } else if (bytes <= 0) {
 605                                 close (outpipe);
 606                                 gdk_pixbuf_loader_close (loader, NULL);
 607                                 outpipe = -1;
 608                         }
 609                 }
 610
 611                 rotated_pixbuf = gdk_pixbuf_rotate_simple (
 612                                         gdk_pixbuf_loader_get_pixbuf (loader),
 613                                         360 - rc->rotation);
 614                 g_spawn_close_pid (child_pid);
 615                 g_object_unref (loader);
 616         } else {
 617                 filename =
 618                         g_build_filename (comics_document->dir,
 619                                           (char *) comics_document->page_names->pdata[rc->page->index],
 620                                           NULL);
 621
 622                 gdk_pixbuf_get_file_info (filename, &width, &height);
 623
 624                 rotated_pixbuf =
 625                   gdk_pixbuf_rotate_simple (gdk_pixbuf_new_from_file_at_size (
 626                                             filename, width * (rc->scale) + 0.5,
 627                                             height * (rc->scale) + 0.5, NULL),
 628                                             360 - rc->rotation);
 629                 g_free (filename);
 630
 631         }
 632         return rotated_pixbuf;
 633 }
 634
 635 static cairo_surface_t *
 636 comics_document_render (EvDocument      *document,
 637                         EvRenderContext *rc)
 638 {
 639         GdkPixbuf       *pixbuf;
 640         cairo_surface_t *surface;
 641
 642         pixbuf = comics_document_render_pixbuf (document, rc);
 643         surface = ev_document_misc_surface_from_pixbuf (pixbuf);
 644         g_object_unref (pixbuf);
 645
 646         return surface;
 647 }
 648
 649 static void
 650 render_pixbuf_size_prepared_cb (GdkPixbufLoader *loader,
 651                                 gint             width,
 652                                 gint             height,
 653                                 gpointer         data)
 654 {
 655         double *scale = data;
 656         int w = (width  * (*scale) + 0.5);
 657         int h = (height * (*scale) + 0.5);
 658
 659         gdk_pixbuf_loader_set_size (loader, w, h);
 660 }
 661
 662 /**
 663  * comics_remove_dir: Removes a directory recursively.
 664  * Returns:
 665  *      0 if it was successfully deleted,
 666  *      -1 if an error occurred
 667  */
 668 static int
 669 comics_remove_dir (gchar *path_name)
 670 {
 671         GDir  *content_dir;
 672         const gchar *filename;
 673         gchar *filename_with_path;
 674
 675         if (g_file_test (path_name, G_FILE_TEST_IS_DIR)) {
 676                 content_dir = g_dir_open  (path_name, 0, NULL);
 677                 filename  = g_dir_read_name (content_dir);
 678                 while (filename) {
 679                         filename_with_path =
 680                                 g_build_filename (path_name,
 681                                                   filename, NULL);
 682                         comics_remove_dir (filename_with_path);
 683                         g_free (filename_with_path);
 684                         filename = g_dir_read_name (content_dir);
 685                 }
 686                 g_dir_close (content_dir);
 687         }
 688         /* Note from g_remove() documentation: on Windows, it is in general not
 689          * possible to remove a file that is open to some process, or mapped
 690          * into memory.*/
 691         return (g_remove (path_name));
 692 }
 693
 694 static void
 695 comics_document_finalize (GObject *object)
 696 {
 697         ComicsDocument *comics_document = COMICS_DOCUMENT (object);
 698
 699         if (comics_document->decompress_tmp) {
 700                 if (comics_remove_dir (comics_document->dir) == -1)
 701                         g_warning (_("There was an error deleting “%s”."),
 702                                    comics_document->dir);
 703                 g_free (comics_document->dir);
 704         }
 705
 706         if (comics_document->page_names) {
 707                 g_ptr_array_foreach (comics_document->page_names, (GFunc) g_free, NULL);
 708                 g_ptr_array_free (comics_document->page_names, TRUE);
 709         }
 710
 711         g_free (comics_document->archive);
 712         g_free (comics_document->selected_command);
 713         g_free (comics_document->extract_command);
 714         g_free (comics_document->list_command);
 715
 716         G_OBJECT_CLASS (comics_document_parent_class)->finalize (object);
 717 }
 718
 719 static void
 720 comics_document_class_init (ComicsDocumentClass *klass)
 721 {
 722         GObjectClass    *gobject_class = G_OBJECT_CLASS (klass);
 723         EvDocumentClass *ev_document_class = EV_DOCUMENT_CLASS (klass);
 724
 725         gobject_class->finalize = comics_document_finalize;
 726
 727         ev_document_class->load = comics_document_load;
 728         ev_document_class->save = comics_document_save;
 729         ev_document_class->get_n_pages = comics_document_get_n_pages;
 730         ev_document_class->get_page_size = comics_document_get_page_size;
 731         ev_document_class->render = comics_document_render;
 732 }
 733
 734 static void
 735 comics_document_init (ComicsDocument *comics_document)
 736 {
 737         comics_document->archive = NULL;
 738         comics_document->page_names = NULL;
 739         comics_document->extract_command = NULL;
 740 }
 741
 742 /* Returns a list of file extensions supported by gdk-pixbuf */
 743 static GSList*
 744 get_supported_image_extensions()
 745 {
 746         GSList *extensions = NULL;
 747         GSList *formats = gdk_pixbuf_get_formats ();
 748         GSList *l;
 749
 750         for (l = formats; l != NULL; l = l->next) {
 751                 int i;
 752                 gchar **ext = gdk_pixbuf_format_get_extensions (l->data);
 753
 754                 for (i = 0; ext[i] != NULL; i++) {
 755                         extensions = g_slist_append (extensions,
 756                                                      g_strdup (ext[i]));
 757                 }
 758
 759                 g_strfreev (ext);
 760         }
 761
 762         g_slist_free (formats);
 763         return extensions;
 764 }
 765
 766 static GdkPixbuf *
 767 comics_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document,
 768                                           EvRenderContext      *rc,
 769                                           gboolean              border)
 770 {
 771         GdkPixbuf *thumbnail;
 772
 773         thumbnail = comics_document_render_pixbuf (EV_DOCUMENT (document), rc);
 774
 775         if (border) {
 776               GdkPixbuf *tmp_pixbuf = thumbnail;
 777
 778               thumbnail = ev_document_misc_get_thumbnail_frame (-1, -1, tmp_pixbuf);
 779               g_object_unref (tmp_pixbuf);
 780         }
 781
 782         return thumbnail;
 783 }
 784
 785 static void
 786 comics_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 787                                            EvRenderContext      *rc,
 788                                            gint                 *width,
 789                                            gint                 *height)
 790 {
 791         gdouble page_width, page_height;
 792
 793         comics_document_get_page_size (EV_DOCUMENT (document), rc->page,
 794                                        &page_width, &page_height);
 795
 796         if (rc->rotation == 90 || rc->rotation == 270) {
 797                 *width = (gint) (page_height * rc->scale);
 798                 *height = (gint) (page_width * rc->scale);
 799         } else {
 800                 *width = (gint) (page_width * rc->scale);
 801                 *height = (gint) (page_height * rc->scale);
 802         }
 803 }
 804
 805 static void
 806 comics_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
 807 {
 808         iface->get_thumbnail = comics_document_thumbnails_get_thumbnail;
 809         iface->get_dimensions = comics_document_thumbnails_get_dimensions;
 810 }
 811
 812 static char**
 813 extract_argv (EvDocument *document, gint page)
 814 {
 815         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 816         char **argv;
 817         char *command_line, *quoted_archive, *quoted_filename;
 818         GError *err = NULL;
 819
 820         if (page >= comics_document->page_names->len)
 821                 return NULL;
 822
 823         quoted_archive = g_shell_quote (comics_document->archive);
 824         if (comics_document->regex_arg) {
 825                 quoted_filename = comics_regex_quote (comics_document->page_names->pdata[page]);
 826         } else {
 827                 quoted_filename = g_shell_quote (comics_document->page_names->pdata[page]);
 828         }
 829
 830         command_line = g_strdup_printf ("%s -- %s %s",
 831                                         comics_document->extract_command,
 832                                         quoted_archive,
 833                                         quoted_filename);
 834
 835         g_shell_parse_argv (command_line, NULL, &argv, &err);
 836
 837         if (err) {
 838                 g_warning (_("Error %s"), err->message);
 839                 g_error_free (err);
 840                 return NULL;
 841         }
 842
 843         g_free (command_line);
 844         g_free (quoted_archive);
 845         g_free (quoted_filename);
 846         return argv;
 847 }