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” in order to "
 129                              "decompress the comic book: %s"),
 130                              basename,
 131                              err->message);
 132                 g_error_free (err);
 133         } else if (WIFEXITED (retval)) {
 134                 if (WEXITSTATUS (retval) == EXIT_SUCCESS) {
 135                         g_free (std_out);
 136                         g_free (basename);
 137                         return TRUE;
 138                 } else {
 139                         g_set_error (error,
 140                                      EV_DOCUMENT_ERROR,
 141                                      EV_DOCUMENT_ERROR_INVALID,
 142                                      _("The command “%s” failed at "
 143                                      "decompressing the comic book."),
 144                                      basename);
 145                         g_free (std_out);
 146                 }
 147         } else {
 148                 g_set_error (error,
 149                              EV_DOCUMENT_ERROR,
 150                              EV_DOCUMENT_ERROR_INVALID,
 151                              _("The command “%s” did not end normally."),
 152                              basename);
 153                 g_free (std_out);
 154         }
 155         g_free (basename);
 156         return FALSE;
 157 }
 158
 159 /* This function shows how to use the choosen command for decompressing a
 160  * comic book file. It modifies fields of the ComicsDocument struct with
 161  * this information */
 162 static gboolean
 163 comics_generate_command_lines (ComicsDocument *comics_document,
 164                                GError         **error)
 165 {
 166         gchar *quoted_file;
 167         gchar *command_decompress_tmp, *checksum;
 168
 169         quoted_file = g_shell_quote (comics_document->archive);
 170
 171         /* RARLabs software     */
 172         if (g_str_has_suffix (comics_document->selected_command, "unrar") &&
 173                 !comics_document->flag_FLOSS) {
 174                 comics_document->extract_command =
 175                         g_strdup_printf ("%s p -c- -ierr",
 176                                          comics_document->selected_command);
 177                 comics_document->list_command =
 178                         g_strdup_printf ("%s vb -c- -- %s",
 179                                          comics_document->selected_command,
 180                                          quoted_file);
 181                 comics_document->flag_temp = FALSE;
 182                 comics_document->regex_arg = FALSE;
 183                 g_free (quoted_file);
 184                 return TRUE;
 185         }
 186
 187         /* Gna! unrar */
 188         if (g_str_has_suffix (comics_document->selected_command, "unrar-free")||
 189             (g_str_has_suffix (comics_document->selected_command, "unrar") &&
 190             comics_document->flag_FLOSS)) {
 191
 192                 comics_document->flag_temp = TRUE;
 193
 194                 checksum =
 195                         g_compute_checksum_for_string (G_CHECKSUM_MD5,
 196                                                        comics_document->archive,
 197                                                        -1);
 198                 comics_document->dir = g_build_filename (ev_tmp_dir (),
 199                                                          checksum, NULL);
 200                 g_free (checksum);
 201                 /* unrar-free can't create directories so we do it on its
 202                  * behalf */
 203                 if (g_mkdir_with_parents (comics_document->dir, 0700) != 0) {
 204                         int errsv = errno;
 205                         g_set_error (error,
 206                                      EV_DOCUMENT_ERROR,
 207                                      EV_DOCUMENT_ERROR_INVALID,
 208                                      _("Failed to create a temporary "
 209                                      "directory on “%s”: %s"),
 210                                      ev_tmp_dir (),
 211                                      g_strerror (errsv));
 212                         g_free (quoted_file);
 213                         comics_document->flag_temp = FALSE;
 214                         g_free (comics_document->dir);
 215                         return FALSE;
 216                 }
 217
 218                 command_decompress_tmp =
 219                         g_strdup_printf ("%s -xf %s %s",
 220                                          comics_document->selected_command,
 221                                          quoted_file,
 222                                          comics_document->dir);
 223
 224                 if (!comics_decompress_temp_dir (command_decompress_tmp,
 225                     comics_document->selected_command, error)){
 226                         g_free (command_decompress_tmp);
 227                         g_free (quoted_file);
 228                         return FALSE;
 229                 } else {
 230                         comics_document->list_command =
 231                              g_strdup_printf ("%s t %s",
 232                                               comics_document->selected_command,
 233                                               quoted_file);
 234                         comics_document->regex_arg = TRUE;
 235                         g_free (command_decompress_tmp);
 236                         g_free (quoted_file);
 237                         return TRUE;
 238                 }
 239         }
 240
 241         /* InfoZIP's unzip */
 242         if (g_str_has_suffix (comics_document->selected_command,"unzip")) {
 243                 comics_document->extract_command =
 244                         g_strdup_printf ("%s -p -C",
 245                                          comics_document->selected_command);
 246                 comics_document->list_command =
 247                         g_strdup_printf ("%s -Z -1 -- %s",
 248                                          comics_document->selected_command,
 249                                          quoted_file);
 250                 comics_document->flag_temp = FALSE;
 251                 comics_document->regex_arg = TRUE;
 252                 g_free (quoted_file);
 253                 return TRUE;
 254         }
 255
 256         /* p7zip */
 257         if (g_str_has_suffix (comics_document->selected_command,"7zr")) {
 258                 comics_document->extract_command =
 259                         g_strdup_printf ("%s x -so",
 260                                          comics_document->selected_command);
 261                 comics_document->list_command =
 262                         g_strdup_printf ("%s l -- %s",
 263                                          comics_document->selected_command,
 264                                          quoted_file);
 265                 comics_document->flag_temp = FALSE;
 266                 comics_document->regex_arg = TRUE;
 267                 g_free (quoted_file);
 268                 return TRUE;
 269         }
 270
 271         /* You are not supposed to get here ! */
 272         g_set_error_literal (error,
 273                              EV_DOCUMENT_ERROR,
 274                              EV_DOCUMENT_ERROR_INVALID,
 275                              _("Internal error configuring the command for "
 276                              "decompressing the comic book file"));
 277         g_free (quoted_file);
 278         return FALSE;
 279 }
 280
 281 /* This function chooses an external command for decompressing a comic
 282  * book based on its mime tipe. */
 283 static gboolean
 284 comics_check_decompress_command (gchar          *mime_type,
 285                                  ComicsDocument *comics_document,
 286                                  GError         **error)
 287 {
 288         gboolean success;
 289         gchar *std_out, *std_err;
 290         gint retval;
 291         GError *err = NULL;
 292
 293         /* FIXME, use proper cbr/cbz mime types once they're
 294          * included in shared-mime-info */
 295
 296         if (!strcmp (mime_type, "application/x-cbr") ||
 297             !strcmp (mime_type, "application/x-rar")) {
 298                 /* The RARLAB provides a no-charge proprietary (freeware)
 299                 * decompress-only client for Linux called unrar. Another
 300                 * option is a GPLv2-licensed command-line tool developed by
 301                 * the Gna! project. Confusingly enough, the free software RAR
 302                 * decoder is also named unrar. For this reason we need to add
 303                 * some lines for disambiguation. Sorry for the added the
 304                 * complexity but it's life :)
 305                 * Finally, some distributions, like Debian, rename this free
 306                 * option as unrar-free.
 307                 * */
 308                 comics_document->selected_command =
 309                                         g_find_program_in_path ("unrar");
 310                 if (comics_document->selected_command) {
 311                         /* We only use std_err to avoid printing useless error
 312                          * messages on the terminal */
 313                         success =
 314                                 g_spawn_command_line_sync (
 315                                               comics_document->selected_command,
 316                                                            &std_out, &std_err,
 317                                                            &retval, &err);
 318                         if (!success) {
 319                                 g_propagate_error (error, err);
 320                                 g_error_free (err);
 321                                 return FALSE;
 322                         /* I don't check retval status because RARLAB unrar
 323                          * doesn't have a way to return 0 without involving an
 324                          * operation with a file*/
 325                         } else if (WIFEXITED (retval)) {
 326                                 if (g_strrstr (std_out,"freeware") != NULL)
 327                                         /* The RARLAB freeware client */
 328                                         comics_document->flag_FLOSS = FALSE;
 329                                 else
 330                                         /* The Gna! free software client */
 331                                         comics_document->flag_FLOSS = TRUE;
 332                                 g_free (std_out);
 333                                 g_free (std_err);
 334                                 return TRUE;
 335                         }
 336                 }
 337                 /* The Gna! free software client with Debian naming convention */
 338                 comics_document->selected_command =
 339                                 g_find_program_in_path ("unrar-free");
 340                 if (comics_document->selected_command)
 341                         return TRUE;
 342         } else if (!strcmp (mime_type, "application/x-cbz") ||
 343                    !strcmp (mime_type, "application/zip")) {
 344                 /* InfoZIP's unzip program */
 345                 comics_document->selected_command =
 346                                 g_find_program_in_path ("unzip");
 347                 if (comics_document->selected_command)
 348                         return TRUE;
 349         } else if (!strcmp (mime_type, "application/x-cb7") ||
 350                    !strcmp (mime_type, "application/x-7z-compressed")) {
 351                 /* 7zr is a light stand-alone executable that supports only
 352                  * 7z/LZMA/BCJ */
 353                         comics_document->selected_command =
 354                                 g_find_program_in_path ("7zr");
 355                         if (comics_document->selected_command)
 356                                 return TRUE;
 357         } else {
 358                 g_set_error (error,
 359                              EV_DOCUMENT_ERROR,
 360                              EV_DOCUMENT_ERROR_INVALID,
 361                              _("Not a comic book MIME type: %s"),
 362                              mime_type);
 363                              return FALSE;
 364         }
 365         g_set_error_literal (error,
 366                              EV_DOCUMENT_ERROR,
 367                              EV_DOCUMENT_ERROR_INVALID,
 368                              _("Can't find an appropiate command to "
 369                              "decompress this type of comic book"));
 370         return FALSE;
 371 }
 372
 373 static gboolean
 374 comics_document_load (EvDocument *document,
 375                       const char *uri,
 376                       GError    **error)
 377 {
 378         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 379         GSList *supported_extensions;
 380         gchar *std_out;
 381         gchar *mime_type;
 382         gchar **cbr_files;
 383         gboolean success;
 384         int i, retval;
 385         GError *err = NULL;
 386
 387         comics_document->archive = g_filename_from_uri (uri, NULL, error);
 388         if (!comics_document->archive)
 389                 return FALSE;
 390
 391         mime_type = ev_file_get_mime_type (uri, FALSE, &err);
 392         if (!mime_type) {
 393                 if (err) {
 394                         g_propagate_error (error, err);
 395                 } else {
 396                         g_set_error_literal (error,
 397                                              EV_DOCUMENT_ERROR,
 398                                              EV_DOCUMENT_ERROR_INVALID,
 399                                              _("Unknown MIME Type"));
 400                 }
 401
 402                 return FALSE;
 403         }
 404
 405         if (!comics_check_decompress_command (mime_type, comics_document,
 406         error)) {
 407                 g_free (mime_type);
 408                 return FALSE;
 409         } else if (!comics_generate_command_lines (comics_document, error)) {
 410                    g_free (mime_type);
 411                 return FALSE;
 412         }
 413
 414         g_free (mime_type);
 415
 416         /* Get list of files in archive */
 417         success = g_spawn_command_line_sync (comics_document->list_command,
 418                                              &std_out, NULL, &retval, error);
 419
 420         if (!success) {
 421                 return FALSE;
 422         } else if (!WIFEXITED(retval) || WEXITSTATUS(retval) != EXIT_SUCCESS) {
 423                 g_set_error_literal (error,
 424                                      EV_DOCUMENT_ERROR,
 425                                      EV_DOCUMENT_ERROR_INVALID,
 426                                      _("File corrupted"));
 427                 return FALSE;
 428         }
 429
 430         /* FIXME: is this safe against filenames containing \n in the archive ? */
 431         cbr_files = g_strsplit (std_out, "\n", 0);
 432         g_free (std_out);
 433
 434         if (!cbr_files) {
 435                 g_set_error_literal (error,
 436                                      EV_DOCUMENT_ERROR,
 437                                      EV_DOCUMENT_ERROR_INVALID,
 438                                      _("No files in archive"));
 439                 return FALSE;
 440         }
 441
 442         supported_extensions = get_supported_image_extensions ();
 443         for (i = 0; cbr_files[i] != NULL; i++) {
 444                 gchar *suffix = g_strrstr (cbr_files[i], ".");
 445                 if (!suffix)
 446                         continue;
 447                 suffix = g_ascii_strdown (suffix + 1, -1);
 448
 449                 if (g_slist_find_custom (supported_extensions, suffix,
 450                                          (GCompareFunc) strcmp) != NULL) {
 451                         comics_document->page_names =
 452                                 g_slist_insert_sorted (
 453                                         comics_document->page_names,
 454                                         g_strdup (g_strstrip (cbr_files[i])),
 455                                         (GCompareFunc) strcmp);
 456                         comics_document->n_pages++;
 457                 }
 458
 459                 g_free (suffix);
 460         }
 461
 462         g_strfreev (cbr_files);
 463         g_slist_foreach (supported_extensions, (GFunc) g_free, NULL);
 464         g_slist_free (supported_extensions);
 465
 466         if (comics_document->n_pages == 0) {
 467                 g_set_error (error,
 468                              EV_DOCUMENT_ERROR,
 469                              EV_DOCUMENT_ERROR_INVALID,
 470                              _("No images found in archive %s"),
 471                              uri);
 472                 return FALSE;
 473         }
 474
 475         return TRUE;
 476 }
 477
 478
 479 static gboolean
 480 comics_document_save (EvDocument *document,
 481                       const char *uri,
 482                       GError    **error)
 483 {
 484         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 485
 486         return ev_xfer_uri_simple (comics_document->archive, uri, error);
 487 }
 488
 489 static int
 490 comics_document_get_n_pages (EvDocument *document)
 491 {
 492         return COMICS_DOCUMENT (document)->n_pages;
 493 }
 494
 495 static void
 496 comics_document_get_page_size (EvDocument *document,
 497                                EvPage     *page,
 498                                double     *width,
 499                                double     *height)
 500 {
 501         GdkPixbufLoader *loader;
 502         char **argv;
 503         guchar buf[1024];
 504         gboolean success, got_size = FALSE;
 505         gint outpipe = -1;
 506         GPid child_pid = -1;
 507         gssize bytes;
 508         GdkPixbuf *pixbuf;
 509         gchar *filename;
 510         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 511
 512         if (!comics_document->flag_temp) {
 513
 514                 argv = extract_argv (document, page->index);
 515                 success = g_spawn_async_with_pipes (NULL, argv, NULL,
 516                                                     G_SPAWN_SEARCH_PATH |
 517                                                     G_SPAWN_STDERR_TO_DEV_NULL,
 518                                                     NULL, NULL,
 519                                                     &child_pid,
 520                                                     NULL, &outpipe, NULL, NULL);
 521                 g_strfreev (argv);
 522                 g_return_if_fail (success == TRUE);
 523
 524                 loader = gdk_pixbuf_loader_new ();
 525                 g_signal_connect (loader, "area-prepared",
 526                                   G_CALLBACK (get_page_size_area_prepared_cb),
 527                                   &got_size);
 528
 529                 while (outpipe >= 0) {
 530                         bytes = read (outpipe, buf, 1024);
 531
 532                         if (bytes > 0)
 533                         gdk_pixbuf_loader_write (loader, buf, bytes, NULL);
 534                         if (bytes <= 0 || got_size) {
 535                                 close (outpipe);
 536                                 outpipe = -1;
 537                                 gdk_pixbuf_loader_close (loader, NULL);
 538                         }
 539                 }
 540
 541                 if (gdk_pixbuf_loader_get_pixbuf (loader)) {
 542                         pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
 543                         if (width)
 544                                 *width = gdk_pixbuf_get_width (pixbuf);
 545                         if (height)
 546                                 *height = gdk_pixbuf_get_height (pixbuf);
 547                 }
 548
 549                 g_spawn_close_pid (child_pid);
 550                 g_object_unref (loader);
 551         } else {
 552                 filename = g_build_filename (comics_document->dir,
 553                                              (char*) g_slist_nth_data (
 554                                              comics_document->page_names,
 555                                              page->index),
 556                                              NULL);
 557                 pixbuf = gdk_pixbuf_new_from_file (filename, NULL);
 558                 g_free (filename);
 559                 if (width)
 560                         *width = gdk_pixbuf_get_width (pixbuf);
 561                 if (height)
 562                         *height = gdk_pixbuf_get_height (pixbuf);
 563         }
 564 }
 565
 566 static void
 567 get_page_size_area_prepared_cb (GdkPixbufLoader *loader,
 568                                 gpointer         data)
 569 {
 570         gboolean *got_size = data;
 571         *got_size = TRUE;
 572 }
 573
 574 static GdkPixbuf *
 575 comics_document_render_pixbuf (EvDocument      *document,
 576                                EvRenderContext *rc)
 577 {
 578         GdkPixbufLoader *loader;
 579         GdkPixbuf *rotated_pixbuf;
 580         char **argv;
 581         guchar buf[4096];
 582         gboolean success;
 583         gint outpipe = -1;
 584         GPid child_pid = -1;
 585         gssize bytes;
 586         gint width, height;
 587         gchar *filename;
 588         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 589
 590         if (!comics_document->flag_temp) {
 591                 argv = extract_argv (document, rc->page->index);
 592                 success = g_spawn_async_with_pipes (NULL, argv, NULL,
 593                                                     G_SPAWN_SEARCH_PATH |
 594                                                     G_SPAWN_STDERR_TO_DEV_NULL,
 595                                                     NULL, NULL,
 596                                                     &child_pid,
 597                                                     NULL, &outpipe, NULL, NULL);
 598                 g_strfreev (argv);
 599                 g_return_val_if_fail (success == TRUE, NULL);
 600
 601                 loader = gdk_pixbuf_loader_new ();
 602                 g_signal_connect (loader, "size-prepared",
 603                                   G_CALLBACK (render_pixbuf_size_prepared_cb),
 604                                   &rc->scale);
 605
 606                 while (outpipe >= 0) {
 607                         bytes = read (outpipe, buf, 4096);
 608
 609                         if (bytes > 0) {
 610                                 gdk_pixbuf_loader_write (loader, buf, bytes,
 611                                 NULL);
 612                         } else if (bytes <= 0) {
 613                                 close (outpipe);
 614                                 gdk_pixbuf_loader_close (loader, NULL);
 615                                 outpipe = -1;
 616                         }
 617                 }
 618
 619                 rotated_pixbuf = gdk_pixbuf_rotate_simple (
 620                                         gdk_pixbuf_loader_get_pixbuf (loader),
 621                                         360 - rc->rotation);
 622                 g_spawn_close_pid (child_pid);
 623                 g_object_unref (loader);
 624         } else {
 625                 filename =
 626                         g_build_filename (comics_document->dir,
 627                                           (char*) g_slist_nth_data (
 628                                                 comics_document->page_names,
 629                                                 rc->page->index),
 630                                           NULL);
 631
 632                 gdk_pixbuf_get_file_info (filename, &width, &height);
 633
 634                 rotated_pixbuf =
 635                   gdk_pixbuf_rotate_simple (gdk_pixbuf_new_from_file_at_size (
 636                                             filename, width * (rc->scale) + 0.5,
 637                                             height * (rc->scale) + 0.5, NULL),
 638                                             360 - rc->rotation);
 639                 g_free (filename);
 640
 641         }
 642         return rotated_pixbuf;
 643 }
 644
 645 static cairo_surface_t *
 646 comics_document_render (EvDocument      *document,
 647                         EvRenderContext *rc)
 648 {
 649         GdkPixbuf       *pixbuf;
 650         cairo_surface_t *surface;
 651
 652         pixbuf = comics_document_render_pixbuf (document, rc);
 653         surface = ev_document_misc_surface_from_pixbuf (pixbuf);
 654         g_object_unref (pixbuf);
 655
 656         return surface;
 657 }
 658
 659 static void
 660 render_pixbuf_size_prepared_cb (GdkPixbufLoader *loader,
 661                                 gint             width,
 662                                 gint             height,
 663                                 gpointer         data)
 664 {
 665         double *scale = data;
 666         int w = (width  * (*scale) + 0.5);
 667         int h = (height * (*scale) + 0.5);
 668
 669         gdk_pixbuf_loader_set_size (loader, w, h);
 670 }
 671
 672 /**
 673  * comics_remove_dir: Removes a directory recursively.
 674  * Returns:
 675  *      0 if it was successfully deleted,
 676  *      -1 if an error occurred
 677  */
 678 static int
 679 comics_remove_dir (gchar *path_name)
 680 {
 681         GDir  *content_dir;
 682         const gchar *filename;
 683         gchar *filename_with_path;
 684
 685         if (g_file_test (path_name, G_FILE_TEST_IS_DIR)) {
 686                 content_dir = g_dir_open  (path_name, 0, NULL);
 687                 filename  = g_dir_read_name (content_dir);
 688                 while (filename) {
 689                         filename_with_path =
 690                                 g_build_filename (path_name,
 691                                                   filename, NULL);
 692                         comics_remove_dir (filename_with_path);
 693                         g_free (filename_with_path);
 694                         filename = g_dir_read_name (content_dir);
 695                 }
 696                 g_dir_close (content_dir);
 697         }
 698         /* Note from g_remove() documentation: on Windows, it is in general not
 699          * possible to remove a file that is open to some process, or mapped
 700          * into memory.*/
 701         return (g_remove (path_name));
 702 }
 703
 704 static void
 705 comics_document_finalize (GObject *object)
 706 {
 707         ComicsDocument *comics_document = COMICS_DOCUMENT (object);
 708
 709         if (comics_document->flag_temp) {
 710                 if (comics_remove_dir (comics_document->dir) == -1)
 711                         g_warning (_("There was an error deleting “%s”."),
 712                                    comics_document->dir);
 713                 g_free (comics_document->dir);
 714         }
 715
 716         if (comics_document->archive)
 717                 g_free (comics_document->archive);
 718
 719         if (comics_document->page_names) {
 720                 g_slist_foreach (comics_document->page_names,
 721                                  (GFunc) g_free, NULL);
 722                 g_slist_free (comics_document->page_names);
 723         }
 724
 725         if (comics_document->selected_command)
 726                 g_free (comics_document->selected_command);
 727
 728         if (comics_document->extract_command)
 729                 g_free (comics_document->extract_command);
 730
 731         if (comics_document->list_command)
 732                 g_free (comics_document->list_command);
 733
 734         G_OBJECT_CLASS (comics_document_parent_class)->finalize (object);
 735 }
 736
 737 static void
 738 comics_document_class_init (ComicsDocumentClass *klass)
 739 {
 740         GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 741         gobject_class->finalize = comics_document_finalize;
 742 }
 743
 744 static EvDocumentInfo *
 745 comics_document_get_info (EvDocument *document)
 746 {
 747         EvDocumentInfo *info;
 748         info = g_new0 (EvDocumentInfo, 1);
 749         return info;
 750 }
 751
 752 static void
 753 comics_document_document_iface_init (EvDocumentIface *iface)
 754 {
 755         iface->load = comics_document_load;
 756         iface->save = comics_document_save;
 757         iface->get_n_pages = comics_document_get_n_pages;
 758         iface->get_page_size = comics_document_get_page_size;
 759         iface->render = comics_document_render;
 760         iface->get_info = comics_document_get_info;
 761 }
 762
 763 static void
 764 comics_document_init (ComicsDocument *comics_document)
 765 {
 766         comics_document->archive = NULL;
 767         comics_document->page_names = NULL;
 768         comics_document->extract_command = NULL;
 769         comics_document->n_pages = 0;
 770 }
 771
 772 /* Returns a list of file extensions supported by gdk-pixbuf */
 773 static GSList*
 774 get_supported_image_extensions()
 775 {
 776         GSList *extensions = NULL;
 777         GSList *formats = gdk_pixbuf_get_formats ();
 778         GSList *l;
 779
 780         for (l = formats; l != NULL; l = l->next) {
 781                 int i;
 782                 gchar **ext = gdk_pixbuf_format_get_extensions (l->data);
 783
 784                 for (i = 0; ext[i] != NULL; i++) {
 785                         extensions = g_slist_append (extensions,
 786                                                      g_strdup (ext[i]));
 787                 }
 788
 789                 g_strfreev (ext);
 790         }
 791
 792         g_slist_free (formats);
 793         return extensions;
 794 }
 795
 796 static GdkPixbuf *
 797 comics_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document,
 798                                           EvRenderContext      *rc,
 799                                           gboolean              border)
 800 {
 801         GdkPixbuf *thumbnail;
 802
 803         thumbnail = comics_document_render_pixbuf (EV_DOCUMENT (document), rc);
 804
 805         if (border) {
 806               GdkPixbuf *tmp_pixbuf = thumbnail;
 807
 808               thumbnail = ev_document_misc_get_thumbnail_frame (-1, -1, tmp_pixbuf);
 809               g_object_unref (tmp_pixbuf);
 810         }
 811
 812         return thumbnail;
 813 }
 814
 815 static void
 816 comics_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 817                                            EvRenderContext      *rc,
 818                                            gint                 *width,
 819                                            gint                 *height)
 820 {
 821         gdouble page_width, page_height;
 822
 823         comics_document_get_page_size (EV_DOCUMENT (document), rc->page,
 824                                        &page_width, &page_height);
 825
 826         if (rc->rotation == 90 || rc->rotation == 270) {
 827                 *width = (gint) (page_height * rc->scale);
 828                 *height = (gint) (page_width * rc->scale);
 829         } else {
 830                 *width = (gint) (page_width * rc->scale);
 831                 *height = (gint) (page_height * rc->scale);
 832         }
 833 }
 834
 835 static void
 836 comics_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
 837 {
 838         iface->get_thumbnail = comics_document_thumbnails_get_thumbnail;
 839         iface->get_dimensions = comics_document_thumbnails_get_dimensions;
 840 }
 841
 842 static char**
 843 extract_argv (EvDocument *document, gint page)
 844 {
 845         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 846         char **argv;
 847         char *command_line, *quoted_archive, *quoted_filename;
 848         GError *err = NULL;
 849
 850         quoted_archive = g_shell_quote (comics_document->archive);
 851         if (comics_document->regex_arg) {
 852                 quoted_filename = comics_regex_quote (
 853                         g_slist_nth_data (comics_document->page_names, page));
 854         } else {
 855                 quoted_filename = g_shell_quote (
 856                         g_slist_nth_data (comics_document->page_names, page));
 857         }
 858
 859         command_line = g_strdup_printf ("%s -- %s %s",
 860                                         comics_document->extract_command,
 861                                         quoted_archive,
 862                                         quoted_filename);
 863
 864         g_shell_parse_argv (command_line, NULL, &argv, &err);
 865
 866         if (err) {
 867                 g_warning (_("Error %s"), err->message);
 868                 g_error_free (err);
 869                 return NULL;
 870         }
 871
 872         g_free (command_line);
 873         g_free (quoted_archive);
 874         g_free (quoted_filename);
 875         return argv;
 876 }