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 struct _ComicsDocument
  43 {
  44         GObject parent_instance;
  45
  46         gchar    *archive, *dir;
  47         GSList   *page_names;
  48         gint     n_pages;
  49         gchar    *selected_command;
  50         gchar    *extract_command, *list_command;
  51         gboolean regex_arg, flag_temp, flag_FLOSS;
  52 };
  53
  54 typedef struct _ComicsDocumentClass ComicsDocumentClass;
  55
  56 static void       comics_document_document_iface_init (EvDocumentIface *iface);
  57 static void       comics_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface);
  58
  59 static GSList*    get_supported_image_extensions (void);
  60 static void       get_page_size_area_prepared_cb (GdkPixbufLoader *loader,
  61                                                   gpointer data);
  62 static void       render_pixbuf_size_prepared_cb (GdkPixbufLoader *loader,
  63                                                   gint width,
  64                                                   gint height,
  65                                                   gpointer data);
  66 static char**     extract_argv                   (EvDocument *document,
  67                                                   gint page);
  68
  69
  70 EV_BACKEND_REGISTER_WITH_CODE (ComicsDocument, comics_document,
  71         {
  72                 EV_BACKEND_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_THUMBNAILS,
  73                                                 comics_document_document_thumbnails_iface_init);
  74         } );
  75
  76 static char *
  77 comics_regex_quote (const char *s)
  78 {
  79     char *ret, *d;
  80
  81     d = ret = g_malloc (strlen (s) * 4 + 3);
  82
  83     *d++ = '\'';
  84
  85     for (; *s; s++, d++) {
  86         switch (*s) {
  87         case '?':
  88         case '|':
  89         case '[':
  90         case ']':
  91         case '*':
  92         case '\\':
  93             *d++ = '\\';
  94             break;
  95         case '\'':
  96             *d++ = '\'';
  97             *d++ = '\\';
  98             *d++ = '\'';
  99             break;
 100         }
 101         *d = *s;
 102     }
 103
 104     *d++ = '\'';
 105     *d = '\0';
 106
 107     return ret;
 108 }
 109
 110 /* This function manages the command for decompressing a comic book */
 111 static gboolean
 112 comics_decompress_temp_dir (const gchar       *command_decompress_tmp,
 113                                 const gchar   *command,
 114                                 GError        **error)
 115 {
 116         gboolean success;
 117         gchar *std_out, *basename;
 118         GError *err = NULL;
 119         gint retval;
 120
 121         success = g_spawn_command_line_sync (command_decompress_tmp, &std_out,
 122                                                 NULL, &retval, &err);
 123         basename = g_path_get_basename (command);
 124         if (!success) {
 125                 g_set_error (error,
 126                         EV_DOCUMENT_ERROR,
 127                         EV_DOCUMENT_ERROR_INVALID,
 128                         _("Error launching the command %s for decompressing "
 129                           "the comic book to the temporary directory: %s"), basename, err->message);
 130                         g_error_free (err);
 131         } else if (WIFEXITED (retval)) {
 132                 if (WEXITSTATUS (retval) == EXIT_SUCCESS) {
 133                         g_free (std_out);
 134                         g_free (basename);
 135                         return TRUE;
 136                 } else {
 137                         g_set_error (error,
 138                                 EV_DOCUMENT_ERROR,
 139                                 EV_DOCUMENT_ERROR_INVALID,
 140                                 _("The command %s failed to decompress the "
 141                                   "comic book to the temporary directory."), basename);
 142                         g_free (std_out);
 143                 }
 144         } else {
 145                 g_set_error (error,
 146                         EV_DOCUMENT_ERROR,
 147                         EV_DOCUMENT_ERROR_INVALID,
 148                         _("The command %s does not end normally."), basename);
 149                 g_free (std_out);
 150         }
 151         g_free (basename);
 152         return FALSE;
 153 }
 154
 155 /* This function shows how to use the choosen command for decompressing a
 156  * comic book file. It modifies fields of the ComicsDocument struct with
 157  * this information */
 158 static gboolean
 159 comics_generate_command_lines (ComicsDocument *comics_document,
 160                                GError        **error)
 161 {
 162         gchar *quoted_file;
 163         gchar *command_decompress_tmp, *checksum;
 164
 165         quoted_file = g_shell_quote (comics_document->archive);
 166
 167         /* RARLabs software     */
 168         if (g_str_has_suffix (comics_document->selected_command, "unrar") &&
 169                 !comics_document->flag_FLOSS) {
 170                 comics_document->extract_command =
 171                         g_strdup_printf ("%s p -c- -ierr",
 172                                 comics_document->selected_command);
 173                 comics_document->list_command =
 174                         g_strdup_printf ("%s vb -c- -- %s",
 175                                 comics_document->selected_command, quoted_file);
 176                 comics_document->flag_temp = FALSE;
 177                 comics_document->regex_arg = FALSE;
 178                 g_free (quoted_file);
 179                 return TRUE;
 180         }
 181
 182         /* Gna! unrar */
 183         if (g_str_has_suffix (comics_document->selected_command, "unrar-free")
 184                 || (g_str_has_suffix (comics_document->selected_command,
 185                 "unrar") && comics_document->flag_FLOSS)) {
 186
 187                 comics_document->flag_temp = TRUE;
 188
 189                 checksum = g_compute_checksum_for_string (G_CHECKSUM_MD5,
 190                                 comics_document->archive, -1);
 191                 comics_document->dir = g_build_filename (ev_tmp_dir (),
 192                                                 checksum, NULL);
 193                 g_free (checksum);
 194                 /* unrar-free can't create directories so we do it on its
 195                  * behalf */
 196                 if (g_mkdir_with_parents (comics_document->dir, 0700) != 0) {
 197                         g_set_error (error,
 198                                 EV_DOCUMENT_ERROR,
 199                                 EV_DOCUMENT_ERROR_INVALID,
 200                                 _("Failed to create a directory %s in the "
 201                                   "temporary directory: %s"),
 202                                   comics_document->dir,
 203                                   g_strerror (errno));
 204                         g_free (quoted_file);
 205                         return FALSE;
 206                 }
 207
 208                 command_decompress_tmp = g_strdup_printf ( "%s -xf %s %s",
 209                                         comics_document->selected_command,
 210                                         quoted_file,
 211                                         comics_document->dir);
 212
 213                 if (!comics_decompress_temp_dir (command_decompress_tmp,
 214                                              comics_document->selected_command,
 215                                              error)){
 216                         g_free (command_decompress_tmp);
 217                         g_free (quoted_file);
 218                         return FALSE;
 219                 } else {
 220                         comics_document->list_command =
 221                                 g_strdup_printf ("%s t %s",
 222                                         comics_document->selected_command,
 223                                         quoted_file);
 224                         comics_document->regex_arg = TRUE;
 225                         g_free (command_decompress_tmp);
 226                         g_free (quoted_file);
 227                         return TRUE;
 228                 }
 229         }
 230
 231         /* InfoZIP's unzip */
 232         if (g_str_has_suffix (comics_document->selected_command,"unzip")) {
 233                 comics_document->extract_command =
 234                         g_strdup_printf ("%s -p -C",
 235                                 comics_document->selected_command);
 236                 comics_document->list_command =
 237                         g_strdup_printf ("%s -Z -1 -- %s",
 238                                 comics_document->selected_command,
 239                                 quoted_file);
 240                 comics_document->flag_temp = FALSE;
 241                 comics_document->regex_arg = TRUE;
 242                 g_free (quoted_file);
 243                 return TRUE;
 244         }
 245
 246         /* p7zip */
 247         if (g_str_has_suffix (comics_document->selected_command,"7zr")) {
 248                 comics_document->extract_command =
 249                         g_strdup_printf ("%s x -so",
 250                                 comics_document->selected_command);
 251                 comics_document->list_command =
 252                         g_strdup_printf ("%s l -- %s",
 253                                 comics_document->selected_command,
 254                                 quoted_file);
 255                 comics_document->flag_temp = FALSE;
 256                 comics_document->regex_arg = TRUE;
 257                 g_free (quoted_file);
 258                 return TRUE;
 259
 260         }
 261         /* You are not supposed to get here ! */
 262         g_set_error_literal (error,
 263                 EV_DOCUMENT_ERROR,
 264                 EV_DOCUMENT_ERROR_INVALID,
 265                 _("Internal error configuring the command for decompressing "
 266                   "the comic book file"));
 267         g_free (quoted_file);
 268         return FALSE;
 269 }
 270
 271 /* This function chooses an external command for decompressing a comic
 272  * book based on its mime tipe. */
 273 static gboolean
 274 comics_check_decompress_command (gchar          *mime_type,
 275                                 ComicsDocument  *comics_document,
 276                                 GError         **error)
 277 {
 278         gboolean success;
 279         gchar *std_out, *std_err;
 280         gint retval;
 281         GError *err = NULL;
 282
 283         /* FIXME, use proper cbr/cbz mime types once they're
 284          * included in shared-mime-info */
 285
 286         if (!strcmp (mime_type, "application/x-cbr") ||
 287             !strcmp (mime_type, "application/x-rar")) {
 288                 /* The RARLAB provides a no-charge proprietary (freeware)
 289                 * decompress-only client for Linux called unrar. Another
 290                 * option is a GPLv2-licensed command-line tool developed by
 291                 * the Gna! project. Confusingly enough, the free software RAR
 292                 * decoder is also named unrar. For this reason we need to add
 293                 * some lines for disambiguation. Sorry for the added the
 294                 * complexity but it's life :)
 295                 * Finally, some distributions, like Debian, rename this free
 296                 * option as unrar-free.
 297                 * */
 298                 comics_document->selected_command =
 299                                 g_find_program_in_path ("unrar");
 300                 if (comics_document->selected_command) {
 301                         /* We only use std_err to avoid printing useless error
 302                          * messages on the terminal */
 303                         success = g_spawn_command_line_sync (
 304                                         comics_document->selected_command,
 305                                         &std_out, &std_err, &retval, &err);
 306                         if (!success) {
 307                                 g_propagate_error (error, err);
 308                                 g_error_free (err);
 309                                 return FALSE;
 310                         /* I don't check retval status because RARLAB unrar
 311                          * doesn't have a way to return 0 without involving an
 312                          * operation with a file*/
 313                         } else if (WIFEXITED (retval)) {
 314                                 if (g_strrstr (std_out,"freeware") != NULL)
 315                                         /* The RARLAB freeware client */
 316                                         comics_document->flag_FLOSS = FALSE;
 317                                 else
 318                                         /* The Gna! free software client */
 319                                         comics_document->flag_FLOSS = TRUE;
 320                                 g_free (std_out);
 321                                 g_free (std_err);
 322                                 return TRUE;
 323                         }
 324                 }
 325                 /* The Gna! free software client with Debian naming convention */
 326                 comics_document->selected_command =
 327                                 g_find_program_in_path ("unrar-free");
 328                 if (comics_document->selected_command)
 329                         return TRUE;
 330         } else if (!strcmp (mime_type, "application/x-cbz") ||
 331                    !strcmp (mime_type, "application/zip")) {
 332                 /* InfoZIP's unzip program */
 333                 comics_document->selected_command =
 334                                 g_find_program_in_path ("unzip");
 335                 if (comics_document->selected_command)
 336                         return TRUE;
 337         } else if (!strcmp (mime_type, "application/x-cb7") ||
 338                 !strcmp (mime_type, "application/x-7z-compressed")) {
 339                 /* 7zr is a light stand-alone executable that supports only
 340                  * 7z/LZMA/BCJ */
 341                 comics_document->selected_command =
 342                                 g_find_program_in_path ("7zr");
 343                 if (comics_document->selected_command)
 344                         return TRUE;
 345         } else {
 346                 g_set_error (error,
 347                              EV_DOCUMENT_ERROR,
 348                              EV_DOCUMENT_ERROR_INVALID,
 349                              _("Not a comic book MIME type: %s"),
 350                              mime_type);
 351                              return FALSE;
 352         }
 353         g_set_error_literal (error,
 354                              EV_DOCUMENT_ERROR,
 355                              EV_DOCUMENT_ERROR_INVALID,
 356                              _("Can't find an appropiate command to "
 357                                "decompress this type of comic book"));
 358         return FALSE;
 359 }
 360
 361 static gboolean
 362 comics_document_load (EvDocument *document,
 363                       const char *uri,
 364                       GError    **error)
 365 {
 366         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 367         GSList *supported_extensions;
 368         gchar *std_out;
 369         gchar *mime_type;
 370         gchar **cbr_files;
 371         gboolean success;
 372         int i, retval;
 373         GError *err = NULL;
 374
 375         comics_document->archive = g_filename_from_uri (uri, NULL, error);
 376         if (!comics_document->archive)
 377                 return FALSE;
 378
 379         mime_type = ev_file_get_mime_type (uri, FALSE, &err);
 380         if (!mime_type) {
 381                 if (err) {
 382                         g_propagate_error (error, err);
 383                 } else {
 384                         g_set_error_literal (error,
 385                                               EV_DOCUMENT_ERROR,
 386                                               EV_DOCUMENT_ERROR_INVALID,
 387                                               _("Unknown MIME Type"));
 388                 }
 389
 390                 return FALSE;
 391         }
 392
 393         if (!comics_check_decompress_command (mime_type, comics_document,
 394         error)) {
 395                 g_free (mime_type);
 396                 return FALSE;
 397         } else if (!comics_generate_command_lines (comics_document, error)) {
 398                    g_free (mime_type);
 399                 return FALSE;
 400         }
 401
 402         g_free (mime_type);
 403
 404         /* Get list of files in archive */
 405         success = g_spawn_command_line_sync (comics_document->list_command,
 406                                              &std_out, NULL, &retval, error);
 407
 408         if (!success) {
 409                 return FALSE;
 410         } else if (!WIFEXITED(retval) || WEXITSTATUS(retval) != EXIT_SUCCESS) {
 411                 g_set_error_literal (error,
 412                                      EV_DOCUMENT_ERROR,
 413                                      EV_DOCUMENT_ERROR_INVALID,
 414                                      _("File corrupted"));
 415                 return FALSE;
 416         }
 417
 418         /* FIXME: is this safe against filenames containing \n in the archive ? */
 419         cbr_files = g_strsplit (std_out, "\n", 0);
 420         g_free (std_out);
 421
 422         if (!cbr_files) {
 423                 g_set_error_literal (error,
 424                                      EV_DOCUMENT_ERROR,
 425                                      EV_DOCUMENT_ERROR_INVALID,
 426                                      _("No files in archive"));
 427                 return FALSE;
 428         }
 429
 430         supported_extensions = get_supported_image_extensions ();
 431         for (i = 0; cbr_files[i] != NULL; i++) {
 432                 gchar *suffix = g_strrstr (cbr_files[i], ".");
 433                 if (!suffix)
 434                         continue;
 435                 suffix = g_ascii_strdown (suffix + 1, -1);
 436
 437                 if (g_slist_find_custom (supported_extensions, suffix,
 438                                          (GCompareFunc) strcmp) != NULL) {
 439                         comics_document->page_names =
 440                                 g_slist_insert_sorted (
 441                                         comics_document->page_names,
 442                                         g_strdup (g_strstrip (cbr_files[i])),
 443                                         (GCompareFunc) strcmp);
 444                         comics_document->n_pages++;
 445                 }
 446
 447                 g_free (suffix);
 448         }
 449
 450         g_strfreev (cbr_files);
 451         g_slist_foreach (supported_extensions, (GFunc) g_free, NULL);
 452         g_slist_free (supported_extensions);
 453
 454         if (comics_document->n_pages == 0) {
 455                 g_set_error (error,
 456                              EV_DOCUMENT_ERROR,
 457                              EV_DOCUMENT_ERROR_INVALID,
 458                              _("No images found in archive %s"),
 459                              uri);
 460                 return FALSE;
 461         }
 462
 463         return TRUE;
 464 }
 465
 466
 467 static gboolean
 468 comics_document_save (EvDocument *document,
 469                       const char *uri,
 470                       GError    **error)
 471 {
 472         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 473
 474         return ev_xfer_uri_simple (comics_document->archive, uri, error);
 475 }
 476
 477 static int
 478 comics_document_get_n_pages (EvDocument *document)
 479 {
 480         return COMICS_DOCUMENT (document)->n_pages;
 481 }
 482
 483 static void
 484 comics_document_get_page_size (EvDocument *document,
 485                                EvPage     *page,
 486                                double     *width,
 487                                double     *height)
 488 {
 489         GdkPixbufLoader *loader;
 490         char **argv;
 491         guchar buf[1024];
 492         gboolean success, got_size = FALSE;
 493         gint outpipe = -1;
 494         GPid child_pid = -1;
 495         gssize bytes;
 496         GdkPixbuf *pixbuf;
 497         gchar *filename;
 498         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 499
 500         if (!comics_document->flag_temp) {
 501
 502                 argv = extract_argv (document, page->index);
 503                 success = g_spawn_async_with_pipes (NULL, argv, NULL,
 504                                                     G_SPAWN_SEARCH_PATH |
 505                                                     G_SPAWN_STDERR_TO_DEV_NULL,
 506                                                     NULL, NULL,
 507                                                     &child_pid,
 508                                                     NULL, &outpipe, NULL, NULL);
 509                 g_strfreev (argv);
 510                 g_return_if_fail (success == TRUE);
 511
 512                 loader = gdk_pixbuf_loader_new ();
 513                 g_signal_connect (loader, "area-prepared",
 514                                   G_CALLBACK (get_page_size_area_prepared_cb),
 515                                   &got_size);
 516
 517                 while (outpipe >= 0) {
 518                         bytes = read (outpipe, buf, 1024);
 519
 520                         if (bytes > 0)
 521                         gdk_pixbuf_loader_write (loader, buf, bytes, NULL);
 522                         if (bytes <= 0 || got_size) {
 523                                 close (outpipe);
 524                                 outpipe = -1;
 525                                 gdk_pixbuf_loader_close (loader, NULL);
 526                         }
 527                 }
 528
 529                 if (gdk_pixbuf_loader_get_pixbuf (loader)) {
 530                         pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
 531                         if (width)
 532                                 *width = gdk_pixbuf_get_width (pixbuf);
 533                         if (height)
 534                                 *height = gdk_pixbuf_get_height (pixbuf);
 535                 }
 536
 537                 g_spawn_close_pid (child_pid);
 538                 g_object_unref (loader);
 539         } else {
 540                 filename = g_build_filename (comics_document->dir,
 541                                                 (char*) g_slist_nth_data (
 542                                                 comics_document->page_names,
 543                                                 page->index),
 544                                                 NULL);
 545                 pixbuf = gdk_pixbuf_new_from_file (filename, NULL);
 546                 g_free (filename);
 547                 if (width)
 548                         *width = gdk_pixbuf_get_width (pixbuf);
 549                 if (height)
 550                         *height = gdk_pixbuf_get_height (pixbuf);
 551         }
 552 }
 553
 554 static void
 555 get_page_size_area_prepared_cb (GdkPixbufLoader *loader,
 556                                 gpointer         data)
 557 {
 558         gboolean *got_size = data;
 559         *got_size = TRUE;
 560 }
 561
 562 static GdkPixbuf *
 563 comics_document_render_pixbuf (EvDocument      *document,
 564                                EvRenderContext *rc)
 565 {
 566         GdkPixbufLoader *loader;
 567         GdkPixbuf *rotated_pixbuf;
 568         char **argv;
 569         guchar buf[4096];
 570         gboolean success;
 571         gint outpipe = -1;
 572         GPid child_pid = -1;
 573         gssize bytes;
 574         gint width, height;
 575         gchar *filename;
 576         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 577
 578         if (!comics_document->flag_temp) {
 579                 argv = extract_argv (document, rc->page->index);
 580                 success = g_spawn_async_with_pipes (NULL, argv, NULL,
 581                                                     G_SPAWN_SEARCH_PATH |
 582                                                     G_SPAWN_STDERR_TO_DEV_NULL,
 583                                                     NULL, NULL,
 584                                                     &child_pid,
 585                                                     NULL, &outpipe, NULL, NULL);
 586                 g_strfreev (argv);
 587                 g_return_val_if_fail (success == TRUE, NULL);
 588
 589                 loader = gdk_pixbuf_loader_new ();
 590                 g_signal_connect (loader, "size-prepared",
 591                                   G_CALLBACK (render_pixbuf_size_prepared_cb),
 592                                   &rc->scale);
 593
 594                 while (outpipe >= 0) {
 595                         bytes = read (outpipe, buf, 4096);
 596
 597                         if (bytes > 0) {
 598                                 gdk_pixbuf_loader_write (loader, buf, bytes,
 599                                 NULL);
 600                         } else if (bytes <= 0) {
 601                                 close (outpipe);
 602                                 gdk_pixbuf_loader_close (loader, NULL);
 603                                 outpipe = -1;
 604                         }
 605                 }
 606
 607                 rotated_pixbuf = gdk_pixbuf_rotate_simple (
 608                                         gdk_pixbuf_loader_get_pixbuf (loader),
 609                                         360 - rc->rotation);
 610                 g_spawn_close_pid (child_pid);
 611                 g_object_unref (loader);
 612         } else {
 613                 filename = g_build_filename (comics_document->dir,
 614                                         (char*) g_slist_nth_data (
 615                                                 comics_document->page_names,
 616                                                 rc->page->index ),
 617                                         NULL);
 618
 619                 gdk_pixbuf_get_file_info (filename, &width, &height);
 620
 621                 rotated_pixbuf = gdk_pixbuf_rotate_simple (
 622                                         gdk_pixbuf_new_from_file_at_size (
 623                                                 filename,
 624                                                 width  * (rc->scale) + 0.5,
 625                                                 height * (rc->scale) + 0.5,
 626                                                 NULL),
 627                                         360 - rc->rotation);
 628                 g_free (filename);
 629
 630         }
 631         return rotated_pixbuf;
 632 }
 633
 634 static cairo_surface_t *
 635 comics_document_render (EvDocument      *document,
 636                         EvRenderContext *rc)
 637 {
 638         GdkPixbuf       *pixbuf;
 639         cairo_surface_t *surface;
 640
 641         pixbuf = comics_document_render_pixbuf (document, rc);
 642         surface = ev_document_misc_surface_from_pixbuf (pixbuf);
 643         g_object_unref (pixbuf);
 644
 645         return surface;
 646 }
 647
 648 static void
 649 render_pixbuf_size_prepared_cb (GdkPixbufLoader *loader,
 650                                 gint             width,
 651                                 gint             height,
 652                                 gpointer         data)
 653 {
 654         double *scale = data;
 655         int w = (width  * (*scale) + 0.5);
 656         int h = (height * (*scale) + 0.5);
 657
 658         gdk_pixbuf_loader_set_size (loader, w, h);
 659 }
 660
 661 /**
 662  * comics_remove_dir: Removes a directory recursively.
 663  * Returns:
 664  *      0 if it was successfully deleted,
 665  *      -1 if an error occurred
 666  */
 667 static int
 668 comics_remove_dir (gchar *path_name)
 669 {
 670         GDir  *content_dir;
 671         const gchar *filename;
 672         gchar *filename_with_path;
 673
 674         if (g_file_test (path_name, G_FILE_TEST_IS_DIR)) {
 675                 content_dir = g_dir_open  (path_name, 0, NULL);
 676                 filename  = g_dir_read_name (content_dir);
 677                 while (filename) {
 678                         filename_with_path = g_build_filename (path_name,
 679                                                 filename, NULL);
 680                         comics_remove_dir (filename_with_path);
 681                         g_free (filename_with_path);
 682                         filename = g_dir_read_name (content_dir);
 683                 }
 684                 g_dir_close (content_dir);
 685         }
 686         /* Note from g_remove() documentation: on Windows, it is in general not
 687          * possible to remove a file that is open to some process, or mapped
 688          * into memory.*/
 689         return (g_remove (path_name));
 690 }
 691
 692 static void
 693 comics_document_finalize (GObject *object)
 694 {
 695         ComicsDocument *comics_document = COMICS_DOCUMENT (object);
 696
 697         if (comics_document->flag_temp) {
 698                 if (comics_remove_dir (comics_document->dir) == -1)
 699                         g_warning (_("There was an error deleting %s"),
 700                                 comics_document->dir);
 701                 g_free (comics_document->dir);
 702         }
 703
 704         if (comics_document->archive)
 705                 g_free (comics_document->archive);
 706
 707         if (comics_document->page_names) {
 708                 g_slist_foreach (comics_document->page_names,
 709                                  (GFunc) g_free, NULL);
 710                 g_slist_free (comics_document->page_names);
 711         }
 712
 713         if (comics_document->selected_command)
 714                 g_free (comics_document->selected_command);
 715
 716         if (comics_document->extract_command)
 717                 g_free (comics_document->extract_command);
 718
 719         if (comics_document->list_command)
 720                 g_free (comics_document->list_command);
 721
 722         G_OBJECT_CLASS (comics_document_parent_class)->finalize (object);
 723 }
 724
 725 static void
 726 comics_document_class_init (ComicsDocumentClass *klass)
 727 {
 728         GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 729         gobject_class->finalize = comics_document_finalize;
 730 }
 731
 732 static EvDocumentInfo *
 733 comics_document_get_info (EvDocument *document)
 734 {
 735         EvDocumentInfo *info;
 736         info = g_new0 (EvDocumentInfo, 1);
 737         return info;
 738 }
 739
 740 static void
 741 comics_document_document_iface_init (EvDocumentIface *iface)
 742 {
 743         iface->load = comics_document_load;
 744         iface->save = comics_document_save;
 745         iface->get_n_pages = comics_document_get_n_pages;
 746         iface->get_page_size = comics_document_get_page_size;
 747         iface->render = comics_document_render;
 748         iface->get_info = comics_document_get_info;
 749 }
 750
 751 static void
 752 comics_document_init (ComicsDocument *comics_document)
 753 {
 754         comics_document->archive = NULL;
 755         comics_document->page_names = NULL;
 756         comics_document->extract_command = NULL;
 757         comics_document->n_pages = 0;
 758 }
 759
 760 /* Returns a list of file extensions supported by gdk-pixbuf */
 761 static GSList*
 762 get_supported_image_extensions()
 763 {
 764         GSList *extensions = NULL;
 765         GSList *formats = gdk_pixbuf_get_formats ();
 766         GSList *l;
 767
 768         for (l = formats; l != NULL; l = l->next) {
 769                 int i;
 770                 gchar **ext = gdk_pixbuf_format_get_extensions (l->data);
 771
 772                 for (i = 0; ext[i] != NULL; i++) {
 773                         extensions = g_slist_append (extensions,
 774                                                      g_strdup (ext[i]));
 775                 }
 776
 777                 g_strfreev (ext);
 778         }
 779
 780         g_slist_free (formats);
 781         return extensions;
 782 }
 783
 784 static GdkPixbuf *
 785 comics_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document,
 786                                           EvRenderContext      *rc,
 787                                           gboolean              border)
 788 {
 789         GdkPixbuf *thumbnail;
 790
 791         thumbnail = comics_document_render_pixbuf (EV_DOCUMENT (document), rc);
 792
 793         if (border) {
 794               GdkPixbuf *tmp_pixbuf = thumbnail;
 795
 796               thumbnail = ev_document_misc_get_thumbnail_frame (-1, -1, tmp_pixbuf);
 797               g_object_unref (tmp_pixbuf);
 798         }
 799
 800         return thumbnail;
 801 }
 802
 803 static void
 804 comics_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 805                                            EvRenderContext      *rc,
 806                                            gint                 *width,
 807                                            gint                 *height)
 808 {
 809         gdouble page_width, page_height;
 810
 811         comics_document_get_page_size (EV_DOCUMENT (document), rc->page,
 812                                        &page_width, &page_height);
 813
 814         if (rc->rotation == 90 || rc->rotation == 270) {
 815                 *width = (gint) (page_height * rc->scale);
 816                 *height = (gint) (page_width * rc->scale);
 817         } else {
 818                 *width = (gint) (page_width * rc->scale);
 819                 *height = (gint) (page_height * rc->scale);
 820         }
 821 }
 822
 823 static void
 824 comics_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
 825 {
 826         iface->get_thumbnail = comics_document_thumbnails_get_thumbnail;
 827         iface->get_dimensions = comics_document_thumbnails_get_dimensions;
 828 }
 829
 830 static char**
 831 extract_argv (EvDocument *document, gint page)
 832 {
 833         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 834         char **argv;
 835         char *command_line, *quoted_archive, *quoted_filename;
 836         GError *err = NULL;
 837
 838         quoted_archive = g_shell_quote (comics_document->archive);
 839         if (comics_document->regex_arg) {
 840                 quoted_filename = comics_regex_quote (
 841                         g_slist_nth_data (comics_document->page_names, page));
 842         } else {
 843                 quoted_filename = g_shell_quote (
 844                         g_slist_nth_data (comics_document->page_names, page));
 845         }
 846
 847         command_line = g_strdup_printf ("%s -- %s %s",
 848                                         comics_document->extract_command,
 849                                         quoted_archive,
 850                                         quoted_filename);
 851
 852         g_shell_parse_argv (command_line, NULL, &argv, &err);
 853
 854         if (err) {
 855                 g_warning (_("Error %s"), err->message);
 856                 g_error_free (err);
 857                 return NULL;
 858         }
 859
 860         g_free (command_line);
 861         g_free (quoted_archive);
 862         g_free (quoted_filename);
 863         return argv;
 864 }