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