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, *checksum;
 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                 checksum =
 202                         g_compute_checksum_for_string (G_CHECKSUM_MD5,
 203                                                        comics_document->archive,
 204                                                        -1);
 205                 comics_document->dir = g_build_filename (ev_tmp_dir (),
 206                                                          checksum, NULL);
 207                 comics_document->decompress_tmp =
 208                         g_strdup_printf (command_usage_def[type].decompress_tmp,
 209                                          comics_document->selected_command,
 210                                          quoted_file,
 211                                          comics_document->dir);
 212                 g_free (quoted_file);
 213                 g_free (checksum);
 214                 /* unrar-free can't create directories so we do it on its
 215                  * behalf */
 216                 if (type == GNAUNRAR) {
 217                         if (g_mkdir_with_parents (comics_document->dir, 0700) !=
 218                             0) {
 219                                 int errsv = errno;
 220                                 g_set_error (error,
 221                                              EV_DOCUMENT_ERROR,
 222                                              EV_DOCUMENT_ERROR_INVALID,
 223                                              _("Failed to create a temporary "
 224                                              "directory."));
 225                                 g_warning ("Failed to create directory %s: %s",
 226                                            comics_document->dir,
 227                                            g_strerror (errsv));
 228
 229                                 return FALSE;
 230                         }
 231                 }
 232                 if (!comics_decompress_temp_dir (comics_document->decompress_tmp,
 233                     comics_document->selected_command, error))
 234                         return FALSE;
 235                 else
 236                         return TRUE;
 237         } else {
 238                 g_free (quoted_file);
 239                 return TRUE;
 240         }
 241
 242 }
 243
 244 /* This function chooses an external command for decompressing a comic
 245  * book based on its mime tipe. */
 246 static gboolean
 247 comics_check_decompress_command (gchar          *mime_type,
 248                                  ComicsDocument *comics_document,
 249                                  GError         **error)
 250 {
 251         gboolean success;
 252         gchar *std_out, *std_err;
 253         gint retval;
 254         GError *err = NULL;
 255
 256         /* FIXME, use proper cbr/cbz mime types once they're
 257          * included in shared-mime-info */
 258
 259         if (!strcmp (mime_type, "application/x-cbr") ||
 260             !strcmp (mime_type, "application/x-rar")) {
 261                 /* The RARLAB provides a no-charge proprietary (freeware)
 262                 * decompress-only client for Linux called unrar. Another
 263                 * option is a GPLv2-licensed command-line tool developed by
 264                 * the Gna! project. Confusingly enough, the free software RAR
 265                 * decoder is also named unrar. For this reason we need to add
 266                 * some lines for disambiguation. Sorry for the added the
 267                 * complexity but it's life :)
 268                 * Finally, some distributions, like Debian, rename this free
 269                 * option as unrar-free.
 270                 * */
 271                 comics_document->selected_command =
 272                                         g_find_program_in_path ("unrar");
 273                 if (comics_document->selected_command) {
 274                         /* We only use std_err to avoid printing useless error
 275                          * messages on the terminal */
 276                         success =
 277                                 g_spawn_command_line_sync (
 278                                               comics_document->selected_command,
 279                                                            &std_out, &std_err,
 280                                                            &retval, &err);
 281                         if (!success) {
 282                                 g_propagate_error (error, err);
 283                                 g_error_free (err);
 284                                 return FALSE;
 285                         /* I don't check retval status because RARLAB unrar
 286                          * doesn't have a way to return 0 without involving an
 287                          * operation with a file*/
 288                         } else if (WIFEXITED (retval)) {
 289                                 if (g_strrstr (std_out,"freeware") != NULL)
 290                                         /* The RARLAB freeware client */
 291                                         comics_document->command_usage = RARLABS;
 292                                 else
 293                                         /* The Gna! free software client */
 294                                         comics_document->command_usage = GNAUNRAR;
 295
 296                                 g_free (std_out);
 297                                 g_free (std_err);
 298                                 return TRUE;
 299                         }
 300                 }
 301                 /* The Gna! free software client with Debian naming convention */
 302                 comics_document->selected_command =
 303                                 g_find_program_in_path ("unrar-free");
 304                 if (comics_document->selected_command) {
 305                         comics_document->command_usage = GNAUNRAR;
 306                         return TRUE;
 307                 }
 308
 309         } else if (!strcmp (mime_type, "application/x-cbz") ||
 310                    !strcmp (mime_type, "application/zip")) {
 311                 /* InfoZIP's unzip program */
 312                 comics_document->selected_command =
 313                                 g_find_program_in_path ("unzip");
 314                 if (comics_document->selected_command) {
 315                         comics_document->command_usage = UNZIP;
 316                         return TRUE;
 317                 }
 318
 319         } else if (!strcmp (mime_type, "application/x-cb7") ||
 320                    !strcmp (mime_type, "application/x-7z-compressed")) {
 321                 /* 7zr is a light stand-alone executable that supports only
 322                  * 7z/LZMA/BCJ */
 323                         comics_document->selected_command =
 324                                 g_find_program_in_path ("7zr");
 325                         if (comics_document->selected_command) {
 326                                 comics_document->command_usage = P7ZIP;
 327                                 return TRUE;
 328                         }
 329         } else {
 330                 g_set_error (error,
 331                              EV_DOCUMENT_ERROR,
 332                              EV_DOCUMENT_ERROR_INVALID,
 333                              _("Not a comic book MIME type: %s"),
 334                              mime_type);
 335                              return FALSE;
 336         }
 337         g_set_error_literal (error,
 338                              EV_DOCUMENT_ERROR,
 339                              EV_DOCUMENT_ERROR_INVALID,
 340                              _("Can't find an appropiate command to "
 341                              "decompress this type of comic book"));
 342         return FALSE;
 343 }
 344
 345 static gboolean
 346 comics_document_load (EvDocument *document,
 347                       const char *uri,
 348                       GError    **error)
 349 {
 350         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 351         GSList *supported_extensions;
 352         gchar *std_out;
 353         gchar *mime_type;
 354         gchar **cbr_files;
 355         gboolean success;
 356         int i, retval;
 357         GError *err = NULL;
 358
 359         comics_document->archive = g_filename_from_uri (uri, NULL, error);
 360         if (!comics_document->archive)
 361                 return FALSE;
 362
 363         mime_type = ev_file_get_mime_type (uri, FALSE, &err);
 364         if (!mime_type) {
 365                 if (err) {
 366                         g_propagate_error (error, err);
 367                 } else {
 368                         g_set_error_literal (error,
 369                                              EV_DOCUMENT_ERROR,
 370                                              EV_DOCUMENT_ERROR_INVALID,
 371                                              _("Unknown MIME Type"));
 372                 }
 373
 374                 return FALSE;
 375         }
 376
 377         if (!comics_check_decompress_command (mime_type, comics_document,
 378         error)) {
 379                 g_free (mime_type);
 380                 return FALSE;
 381         } else if (!comics_generate_command_lines (comics_document, error)) {
 382                    g_free (mime_type);
 383                 return FALSE;
 384         }
 385
 386         g_free (mime_type);
 387
 388         /* Get list of files in archive */
 389         success = g_spawn_command_line_sync (comics_document->list_command,
 390                                              &std_out, NULL, &retval, error);
 391
 392         if (!success) {
 393                 return FALSE;
 394         } else if (!WIFEXITED(retval) || WEXITSTATUS(retval) != EXIT_SUCCESS) {
 395                 g_set_error_literal (error,
 396                                      EV_DOCUMENT_ERROR,
 397                                      EV_DOCUMENT_ERROR_INVALID,
 398                                      _("File corrupted"));
 399                 return FALSE;
 400         }
 401
 402         /* FIXME: is this safe against filenames containing \n in the archive ? */
 403         cbr_files = g_strsplit (std_out, "\n", 0);
 404         g_free (std_out);
 405
 406         if (!cbr_files) {
 407                 g_set_error_literal (error,
 408                                      EV_DOCUMENT_ERROR,
 409                                      EV_DOCUMENT_ERROR_INVALID,
 410                                      _("No files in archive"));
 411                 return FALSE;
 412         }
 413
 414         supported_extensions = get_supported_image_extensions ();
 415         for (i = 0; cbr_files[i] != NULL; i++) {
 416                 gchar *suffix = g_strrstr (cbr_files[i], ".");
 417                 if (!suffix)
 418                         continue;
 419                 suffix = g_ascii_strdown (suffix + 1, -1);
 420
 421                 if (g_slist_find_custom (supported_extensions, suffix,
 422                                          (GCompareFunc) strcmp) != NULL) {
 423                         comics_document->page_names =
 424                                 g_slist_insert_sorted (
 425                                         comics_document->page_names,
 426                                         g_strdup (g_strstrip (cbr_files[i])),
 427                                         (GCompareFunc) strcmp);
 428                         comics_document->n_pages++;
 429                 }
 430
 431                 g_free (suffix);
 432         }
 433
 434         g_strfreev (cbr_files);
 435         g_slist_foreach (supported_extensions, (GFunc) g_free, NULL);
 436         g_slist_free (supported_extensions);
 437
 438         if (comics_document->n_pages == 0) {
 439                 g_set_error (error,
 440                              EV_DOCUMENT_ERROR,
 441                              EV_DOCUMENT_ERROR_INVALID,
 442                              _("No images found in archive %s"),
 443                              uri);
 444                 return FALSE;
 445         }
 446
 447         return TRUE;
 448 }
 449
 450
 451 static gboolean
 452 comics_document_save (EvDocument *document,
 453                       const char *uri,
 454                       GError    **error)
 455 {
 456         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 457
 458         return ev_xfer_uri_simple (comics_document->archive, uri, error);
 459 }
 460
 461 static int
 462 comics_document_get_n_pages (EvDocument *document)
 463 {
 464         return COMICS_DOCUMENT (document)->n_pages;
 465 }
 466
 467 static void
 468 comics_document_get_page_size (EvDocument *document,
 469                                EvPage     *page,
 470                                double     *width,
 471                                double     *height)
 472 {
 473         GdkPixbufLoader *loader;
 474         char **argv;
 475         guchar buf[1024];
 476         gboolean success, got_size = FALSE;
 477         gint outpipe = -1;
 478         GPid child_pid = -1;
 479         gssize bytes;
 480         GdkPixbuf *pixbuf;
 481         gchar *filename;
 482         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 483
 484         if (!comics_document->decompress_tmp) {
 485                 argv = extract_argv (document, page->index);
 486                 success = g_spawn_async_with_pipes (NULL, argv, NULL,
 487                                                     G_SPAWN_SEARCH_PATH |
 488                                                     G_SPAWN_STDERR_TO_DEV_NULL,
 489                                                     NULL, NULL,
 490                                                     &child_pid,
 491                                                     NULL, &outpipe, NULL, NULL);
 492                 g_strfreev (argv);
 493                 g_return_if_fail (success == TRUE);
 494
 495                 loader = gdk_pixbuf_loader_new ();
 496                 g_signal_connect (loader, "area-prepared",
 497                                   G_CALLBACK (get_page_size_area_prepared_cb),
 498                                   &got_size);
 499
 500                 while (outpipe >= 0) {
 501                         bytes = read (outpipe, buf, 1024);
 502
 503                         if (bytes > 0)
 504                         gdk_pixbuf_loader_write (loader, buf, bytes, NULL);
 505                         if (bytes <= 0 || got_size) {
 506                                 close (outpipe);
 507                                 outpipe = -1;
 508                                 gdk_pixbuf_loader_close (loader, NULL);
 509                         }
 510                 }
 511
 512                 if (gdk_pixbuf_loader_get_pixbuf (loader)) {
 513                         pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
 514                         if (width)
 515                                 *width = gdk_pixbuf_get_width (pixbuf);
 516                         if (height)
 517                                 *height = gdk_pixbuf_get_height (pixbuf);
 518                 }
 519
 520                 g_spawn_close_pid (child_pid);
 521                 g_object_unref (loader);
 522         } else {
 523                 filename = g_build_filename (comics_document->dir,
 524                                              (char*) g_slist_nth_data (
 525                                              comics_document->page_names,
 526                                              page->index),
 527                                              NULL);
 528                 pixbuf = gdk_pixbuf_new_from_file (filename, NULL);
 529                 g_free (filename);
 530                 if (width)
 531                         *width = gdk_pixbuf_get_width (pixbuf);
 532                 if (height)
 533                         *height = gdk_pixbuf_get_height (pixbuf);
 534         }
 535 }
 536
 537 static void
 538 get_page_size_area_prepared_cb (GdkPixbufLoader *loader,
 539                                 gpointer         data)
 540 {
 541         gboolean *got_size = data;
 542         *got_size = TRUE;
 543 }
 544
 545 static GdkPixbuf *
 546 comics_document_render_pixbuf (EvDocument      *document,
 547                                EvRenderContext *rc)
 548 {
 549         GdkPixbufLoader *loader;
 550         GdkPixbuf *rotated_pixbuf;
 551         char **argv;
 552         guchar buf[4096];
 553         gboolean success;
 554         gint outpipe = -1;
 555         GPid child_pid = -1;
 556         gssize bytes;
 557         gint width, height;
 558         gchar *filename;
 559         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 560
 561         if (!comics_document->decompress_tmp) {
 562                 argv = extract_argv (document, rc->page->index);
 563                 success = g_spawn_async_with_pipes (NULL, argv, NULL,
 564                                                     G_SPAWN_SEARCH_PATH |
 565                                                     G_SPAWN_STDERR_TO_DEV_NULL,
 566                                                     NULL, NULL,
 567                                                     &child_pid,
 568                                                     NULL, &outpipe, NULL, NULL);
 569                 g_strfreev (argv);
 570                 g_return_val_if_fail (success == TRUE, NULL);
 571
 572                 loader = gdk_pixbuf_loader_new ();
 573                 g_signal_connect (loader, "size-prepared",
 574                                   G_CALLBACK (render_pixbuf_size_prepared_cb),
 575                                   &rc->scale);
 576
 577                 while (outpipe >= 0) {
 578                         bytes = read (outpipe, buf, 4096);
 579
 580                         if (bytes > 0) {
 581                                 gdk_pixbuf_loader_write (loader, buf, bytes,
 582                                 NULL);
 583                         } else if (bytes <= 0) {
 584                                 close (outpipe);
 585                                 gdk_pixbuf_loader_close (loader, NULL);
 586                                 outpipe = -1;
 587                         }
 588                 }
 589
 590                 rotated_pixbuf = gdk_pixbuf_rotate_simple (
 591                                         gdk_pixbuf_loader_get_pixbuf (loader),
 592                                         360 - rc->rotation);
 593                 g_spawn_close_pid (child_pid);
 594                 g_object_unref (loader);
 595         } else {
 596                 filename =
 597                         g_build_filename (comics_document->dir,
 598                                           (char*) g_slist_nth_data (
 599                                                 comics_document->page_names,
 600                                                 rc->page->index),
 601                                           NULL);
 602
 603                 gdk_pixbuf_get_file_info (filename, &width, &height);
 604
 605                 rotated_pixbuf =
 606                   gdk_pixbuf_rotate_simple (gdk_pixbuf_new_from_file_at_size (
 607                                             filename, width * (rc->scale) + 0.5,
 608                                             height * (rc->scale) + 0.5, NULL),
 609                                             360 - rc->rotation);
 610                 g_free (filename);
 611
 612         }
 613         return rotated_pixbuf;
 614 }
 615
 616 static cairo_surface_t *
 617 comics_document_render (EvDocument      *document,
 618                         EvRenderContext *rc)
 619 {
 620         GdkPixbuf       *pixbuf;
 621         cairo_surface_t *surface;
 622
 623         pixbuf = comics_document_render_pixbuf (document, rc);
 624         surface = ev_document_misc_surface_from_pixbuf (pixbuf);
 625         g_object_unref (pixbuf);
 626
 627         return surface;
 628 }
 629
 630 static void
 631 render_pixbuf_size_prepared_cb (GdkPixbufLoader *loader,
 632                                 gint             width,
 633                                 gint             height,
 634                                 gpointer         data)
 635 {
 636         double *scale = data;
 637         int w = (width  * (*scale) + 0.5);
 638         int h = (height * (*scale) + 0.5);
 639
 640         gdk_pixbuf_loader_set_size (loader, w, h);
 641 }
 642
 643 /**
 644  * comics_remove_dir: Removes a directory recursively.
 645  * Returns:
 646  *      0 if it was successfully deleted,
 647  *      -1 if an error occurred
 648  */
 649 static int
 650 comics_remove_dir (gchar *path_name)
 651 {
 652         GDir  *content_dir;
 653         const gchar *filename;
 654         gchar *filename_with_path;
 655
 656         if (g_file_test (path_name, G_FILE_TEST_IS_DIR)) {
 657                 content_dir = g_dir_open  (path_name, 0, NULL);
 658                 filename  = g_dir_read_name (content_dir);
 659                 while (filename) {
 660                         filename_with_path =
 661                                 g_build_filename (path_name,
 662                                                   filename, NULL);
 663                         comics_remove_dir (filename_with_path);
 664                         g_free (filename_with_path);
 665                         filename = g_dir_read_name (content_dir);
 666                 }
 667                 g_dir_close (content_dir);
 668         }
 669         /* Note from g_remove() documentation: on Windows, it is in general not
 670          * possible to remove a file that is open to some process, or mapped
 671          * into memory.*/
 672         return (g_remove (path_name));
 673 }
 674
 675 static void
 676 comics_document_finalize (GObject *object)
 677 {
 678         ComicsDocument *comics_document = COMICS_DOCUMENT (object);
 679
 680         if (comics_document->decompress_tmp) {
 681                 if (comics_remove_dir (comics_document->dir) == -1)
 682                         g_warning (_("There was an error deleting “%s”."),
 683                                    comics_document->dir);
 684                 g_free (comics_document->dir);
 685                 g_remove (ev_tmp_dir ());
 686         }
 687
 688         if (comics_document->page_names) {
 689                 g_slist_foreach (comics_document->page_names,
 690                                  (GFunc) g_free, NULL);
 691                 g_slist_free (comics_document->page_names);
 692         }
 693
 694         g_free (comics_document->archive);
 695         g_free (comics_document->selected_command);
 696         g_free (comics_document->extract_command);
 697         g_free (comics_document->list_command);
 698
 699         G_OBJECT_CLASS (comics_document_parent_class)->finalize (object);
 700 }
 701
 702 static void
 703 comics_document_class_init (ComicsDocumentClass *klass)
 704 {
 705         GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 706         gobject_class->finalize = comics_document_finalize;
 707 }
 708
 709 static EvDocumentInfo *
 710 comics_document_get_info (EvDocument *document)
 711 {
 712         EvDocumentInfo *info;
 713         info = g_new0 (EvDocumentInfo, 1);
 714         return info;
 715 }
 716
 717 static void
 718 comics_document_document_iface_init (EvDocumentIface *iface)
 719 {
 720         iface->load = comics_document_load;
 721         iface->save = comics_document_save;
 722         iface->get_n_pages = comics_document_get_n_pages;
 723         iface->get_page_size = comics_document_get_page_size;
 724         iface->render = comics_document_render;
 725         iface->get_info = comics_document_get_info;
 726 }
 727
 728 static void
 729 comics_document_init (ComicsDocument *comics_document)
 730 {
 731         comics_document->archive = NULL;
 732         comics_document->page_names = NULL;
 733         comics_document->extract_command = NULL;
 734         comics_document->n_pages = 0;
 735 }
 736
 737 /* Returns a list of file extensions supported by gdk-pixbuf */
 738 static GSList*
 739 get_supported_image_extensions()
 740 {
 741         GSList *extensions = NULL;
 742         GSList *formats = gdk_pixbuf_get_formats ();
 743         GSList *l;
 744
 745         for (l = formats; l != NULL; l = l->next) {
 746                 int i;
 747                 gchar **ext = gdk_pixbuf_format_get_extensions (l->data);
 748
 749                 for (i = 0; ext[i] != NULL; i++) {
 750                         extensions = g_slist_append (extensions,
 751                                                      g_strdup (ext[i]));
 752                 }
 753
 754                 g_strfreev (ext);
 755         }
 756
 757         g_slist_free (formats);
 758         return extensions;
 759 }
 760
 761 static GdkPixbuf *
 762 comics_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document,
 763                                           EvRenderContext      *rc,
 764                                           gboolean              border)
 765 {
 766         GdkPixbuf *thumbnail;
 767
 768         thumbnail = comics_document_render_pixbuf (EV_DOCUMENT (document), rc);
 769
 770         if (border) {
 771               GdkPixbuf *tmp_pixbuf = thumbnail;
 772
 773               thumbnail = ev_document_misc_get_thumbnail_frame (-1, -1, tmp_pixbuf);
 774               g_object_unref (tmp_pixbuf);
 775         }
 776
 777         return thumbnail;
 778 }
 779
 780 static void
 781 comics_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 782                                            EvRenderContext      *rc,
 783                                            gint                 *width,
 784                                            gint                 *height)
 785 {
 786         gdouble page_width, page_height;
 787
 788         comics_document_get_page_size (EV_DOCUMENT (document), rc->page,
 789                                        &page_width, &page_height);
 790
 791         if (rc->rotation == 90 || rc->rotation == 270) {
 792                 *width = (gint) (page_height * rc->scale);
 793                 *height = (gint) (page_width * rc->scale);
 794         } else {
 795                 *width = (gint) (page_width * rc->scale);
 796                 *height = (gint) (page_height * rc->scale);
 797         }
 798 }
 799
 800 static void
 801 comics_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
 802 {
 803         iface->get_thumbnail = comics_document_thumbnails_get_thumbnail;
 804         iface->get_dimensions = comics_document_thumbnails_get_dimensions;
 805 }
 806
 807 static char**
 808 extract_argv (EvDocument *document, gint page)
 809 {
 810         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 811         char **argv;
 812         char *command_line, *quoted_archive, *quoted_filename;
 813         GError *err = NULL;
 814
 815         quoted_archive = g_shell_quote (comics_document->archive);
 816         if (comics_document->regex_arg) {
 817                 quoted_filename = comics_regex_quote (
 818                         g_slist_nth_data (comics_document->page_names, page));
 819         } else {
 820                 quoted_filename = g_shell_quote (
 821                         g_slist_nth_data (comics_document->page_names, page));
 822         }
 823
 824         command_line = g_strdup_printf ("%s -- %s %s",
 825                                         comics_document->extract_command,
 826                                         quoted_archive,
 827                                         quoted_filename);
 828
 829         g_shell_parse_argv (command_line, NULL, &argv, &err);
 830
 831         if (err) {
 832                 g_warning (_("Error %s"), err->message);
 833                 g_error_free (err);
 834                 return NULL;
 835         }
 836
 837         g_free (command_line);
 838         g_free (quoted_archive);
 839         g_free (quoted_filename);
 840         return argv;
 841 }