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) 2009, Juanjo Marín <juanj.marin@juntadeandalucia.es>
   4  * Copyright (C) 2005, Teemu Tervo <teemu.tervo@gmx.net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2, or (at your option)
   9  * any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include <config.h>
  22
  23 #include <unistd.h>
  24 #include <string.h>
  25 #include <stdlib.h>
  26 #include <errno.h>
  27
  28 #include <glib.h>
  29 #include <glib/gi18n-lib.h>
  30 #include <glib/gstdio.h>
  31 #include <gio/gio.h>
  32
  33 #ifdef G_OS_WIN32
  34 # define WIFEXITED(x) ((x) != 3)
  35 # define WEXITSTATUS(x) (x)
  36 #else
  37 # include <sys/wait.h>
  38 #endif
  39
  40 #include "comics-document.h"
  41 #include "ev-document-misc.h"
  42 #include "ev-document-thumbnails.h"
  43 #include "ev-file-helpers.h"
  44
  45 typedef enum
  46 {
  47         RARLABS,
  48         GNAUNRAR,
  49         UNZIP,
  50         P7ZIP,
  51         TAR
  52 } ComicBookDecompressType;
  53
  54 typedef struct _ComicsDocumentClass ComicsDocumentClass;
  55
  56 struct _ComicsDocumentClass
  57 {
  58         EvDocumentClass parent_class;
  59 };
  60
  61 struct _ComicsDocument
  62 {
  63         EvDocument parent_instance;
  64
  65         gchar    *archive, *dir;
  66         GPtrArray *page_names;
  67         gchar    *selected_command;
  68         gchar    *extract_command, *list_command, *decompress_tmp;
  69         gint     offset;
  70         ComicBookDecompressType command_usage;
  71 };
  72
  73 #define OFFSET_7Z 53
  74 #define NO_OFFSET 0
  75
  76 /* For perfomance reasons of 7z* we've choosen to decompress on the temporary
  77  * directory instead of decompressing on the stdout */
  78
  79 /**
  80  * @extract: command line arguments to pass to extract a file from the archive
  81  *   to stdout.
  82  * @list: command line arguments to list the archive contents
  83  * @decompress_tmp: command line arguments to pass to extract the archive
  84  *   into a directory.
  85  * @offset: the position offset of the filename on each line in the output of
  86  *   running the @list command
  87  */
  88 typedef struct {
  89         char *extract;
  90         char *list;
  91         char *decompress_tmp;
  92         gint offset;
  93 } ComicBookDecompressCommand;
  94
  95 static const ComicBookDecompressCommand command_usage_def[] = {
  96         /* RARLABS unrar */
  97         {"%s p -c- -ierr --", "%s vb -c- -- %s", NULL             , NO_OFFSET},
  98
  99         /* GNA! unrar */
 100         {NULL               , "%s t %s"        , "%s -xf %s %s"   , NO_OFFSET},
 101
 102         /* unzip */
 103         {"%s -p -C --"      , "%s -Z -1 -- %s" , NULL             , NO_OFFSET},
 104
 105         /* 7zip */
 106         {NULL               , "%s l -- %s"     , "%s x -y %s -o%s", OFFSET_7Z},
 107
 108         /* tar */
 109         {"%s -xOf"          , "%s -tf %s"      , NULL             , NO_OFFSET}
 110 };
 111
 112 static void       comics_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface);
 113
 114 static GSList*    get_supported_image_extensions (void);
 115 static void       get_page_size_area_prepared_cb (GdkPixbufLoader *loader,
 116                                                   gpointer data);
 117 static void       render_pixbuf_size_prepared_cb (GdkPixbufLoader *loader,
 118                                                   gint width,
 119                                                   gint height,
 120                                                   gpointer data);
 121 static char**     extract_argv                   (EvDocument *document,
 122                                                   gint page);
 123
 124
 125 EV_BACKEND_REGISTER_WITH_CODE (ComicsDocument, comics_document,
 126         {
 127                 EV_BACKEND_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_THUMBNAILS,
 128                                                 comics_document_document_thumbnails_iface_init);
 129         } );
 130
 131
 132 /* This function manages the command for decompressing a comic book */
 133 static gboolean
 134 comics_decompress_temp_dir (const gchar *command_decompress_tmp,
 135                             const gchar *command,
 136                             GError      **error)
 137 {
 138         gboolean success;
 139         gchar *std_out, *basename;
 140         GError *err = NULL;
 141         gint retval;
 142
 143         success = g_spawn_command_line_sync (command_decompress_tmp, &std_out,
 144                                              NULL, &retval, &err);
 145         basename = g_path_get_basename (command);
 146         if (!success) {
 147                 g_set_error (error,
 148                              EV_DOCUMENT_ERROR,
 149                              EV_DOCUMENT_ERROR_INVALID,
 150                              _("Error launching the command “%s” in order to "
 151                              "decompress the comic book: %s"),
 152                              basename,
 153                              err->message);
 154                 g_error_free (err);
 155         } else if (WIFEXITED (retval)) {
 156                 if (WEXITSTATUS (retval) == EXIT_SUCCESS) {
 157                         g_free (std_out);
 158                         g_free (basename);
 159                         return TRUE;
 160                 } else {
 161                         g_set_error (error,
 162                                      EV_DOCUMENT_ERROR,
 163                                      EV_DOCUMENT_ERROR_INVALID,
 164                                      _("The command “%s” failed at "
 165                                      "decompressing the comic book."),
 166                                      basename);
 167                         g_free (std_out);
 168                 }
 169         } else {
 170                 g_set_error (error,
 171                              EV_DOCUMENT_ERROR,
 172                              EV_DOCUMENT_ERROR_INVALID,
 173                              _("The command “%s” did not end normally."),
 174                              basename);
 175                 g_free (std_out);
 176         }
 177         g_free (basename);
 178         return FALSE;
 179 }
 180
 181 /* This function shows how to use the choosen command for decompressing a
 182  * comic book file. It modifies fields of the ComicsDocument struct with
 183  * this information */
 184 static gboolean
 185 comics_generate_command_lines (ComicsDocument *comics_document,
 186                                GError         **error)
 187 {
 188         gchar *quoted_file;
 189         ComicBookDecompressType type;
 190
 191         type = comics_document->command_usage;
 192         quoted_file = g_shell_quote (comics_document->archive);
 193
 194         comics_document->extract_command =
 195                             g_strdup_printf (command_usage_def[type].extract,
 196                                              comics_document->selected_command);
 197         comics_document->list_command =
 198                             g_strdup_printf (command_usage_def[type].list,
 199                                              comics_document->selected_command,
 200                                              quoted_file);
 201         comics_document->offset = command_usage_def[type].offset;
 202         if (command_usage_def[type].decompress_tmp) {
 203                 comics_document->dir = ev_mkdtemp ("evince-comics-XXXXXX", error);
 204                 if (comics_document->dir == NULL)
 205                         return FALSE;
 206
 207                 /* unrar-free can't create directories, but ev_mkdtemp already created the dir */
 208
 209                 comics_document->decompress_tmp =
 210                         g_strdup_printf (command_usage_def[type].decompress_tmp,
 211                                          comics_document->selected_command,
 212                                          quoted_file,
 213                                          comics_document->dir);
 214                 g_free (quoted_file);
 215
 216                 if (!comics_decompress_temp_dir (comics_document->decompress_tmp,
 217                     comics_document->selected_command, error))
 218                         return FALSE;
 219                 else
 220                         return TRUE;
 221         } else {
 222                 g_free (quoted_file);
 223                 return TRUE;
 224         }
 225
 226 }
 227
 228 /* This function chooses an external command for decompressing a comic
 229  * book based on its mime tipe. */
 230 static gboolean
 231 comics_check_decompress_command (gchar          *mime_type,
 232                                  ComicsDocument *comics_document,
 233                                  GError         **error)
 234 {
 235         gboolean success;
 236         gchar *std_out, *std_err;
 237         gint retval;
 238         GError *err = NULL;
 239
 240         /* FIXME, use proper cbr/cbz mime types once they're
 241          * included in shared-mime-info */
 242
 243         if (!strcmp (mime_type, "application/x-cbr") ||
 244             !strcmp (mime_type, "application/x-rar")) {
 245                 /* The RARLAB provides a no-charge proprietary (freeware)
 246                 * decompress-only client for Linux called unrar. Another
 247                 * option is a GPLv2-licensed command-line tool developed by
 248                 * the Gna! project. Confusingly enough, the free software RAR
 249                 * decoder is also named unrar. For this reason we need to add
 250                 * some lines for disambiguation. Sorry for the added the
 251                 * complexity but it's life :)
 252                 * Finally, some distributions, like Debian, rename this free
 253                 * option as unrar-free.
 254                 * */
 255                 comics_document->selected_command =
 256                                         g_find_program_in_path ("unrar");
 257                 if (comics_document->selected_command) {
 258                         /* We only use std_err to avoid printing useless error
 259                          * messages on the terminal */
 260                         success =
 261                                 g_spawn_command_line_sync (
 262                                               comics_document->selected_command,
 263                                                            &std_out, &std_err,
 264                                                            &retval, &err);
 265                         if (!success) {
 266                                 g_propagate_error (error, err);
 267                                 g_error_free (err);
 268                                 return FALSE;
 269                         /* I don't check retval status because RARLAB unrar
 270                          * doesn't have a way to return 0 without involving an
 271                          * operation with a file*/
 272                         } else if (WIFEXITED (retval)) {
 273                                 if (g_strrstr (std_out,"freeware") != NULL)
 274                                         /* The RARLAB freeware client */
 275                                         comics_document->command_usage = RARLABS;
 276                                 else
 277                                         /* The Gna! free software client */
 278                                         comics_document->command_usage = GNAUNRAR;
 279
 280                                 g_free (std_out);
 281                                 g_free (std_err);
 282                                 return TRUE;
 283                         }
 284                 }
 285                 /* The Gna! free software client with Debian naming convention */
 286                 comics_document->selected_command =
 287                                 g_find_program_in_path ("unrar-free");
 288                 if (comics_document->selected_command) {
 289                         comics_document->command_usage = GNAUNRAR;
 290                         return TRUE;
 291                 }
 292
 293         } else if (!strcmp (mime_type, "application/x-cbz") ||
 294                    !strcmp (mime_type, "application/zip")) {
 295                 /* InfoZIP's unzip program */
 296                 comics_document->selected_command =
 297                                 g_find_program_in_path ("unzip");
 298                 if (comics_document->selected_command) {
 299                         comics_document->command_usage = UNZIP;
 300                         return TRUE;
 301                 }
 302
 303         } else if (!strcmp (mime_type, "application/x-cb7") ||
 304                    !strcmp (mime_type, "application/x-7z-compressed")) {
 305                 /* 7zr, 7za and 7z are the commands from the p7zip project able
 306                  * to decompress .7z files */
 307                         comics_document->selected_command =
 308                                 g_find_program_in_path ("7zr");
 309                         if (comics_document->selected_command) {
 310                                 comics_document->command_usage = P7ZIP;
 311                                 return TRUE;
 312                         }
 313                         comics_document->selected_command =
 314                                 g_find_program_in_path ("7za");
 315                         if (comics_document->selected_command) {
 316                                 comics_document->command_usage = P7ZIP;
 317                                 return TRUE;
 318                         }
 319                         comics_document->selected_command =
 320                                 g_find_program_in_path ("7z");
 321                         if (comics_document->selected_command) {
 322                                 comics_document->command_usage = P7ZIP;
 323                                 return TRUE;
 324                         }
 325         } else if (!strcmp (mime_type, "application/x-cbt") ||
 326                    !strcmp (mime_type, "application/x-tar")) {
 327                 /* tar utility (Tape ARchive) */
 328                 comics_document->selected_command =
 329                                 g_find_program_in_path ("tar");
 330                 if (comics_document->selected_command) {
 331                         comics_document->command_usage = TAR;
 332                         return TRUE;
 333                 }
 334         } else {
 335                 g_set_error (error,
 336                              EV_DOCUMENT_ERROR,
 337                              EV_DOCUMENT_ERROR_INVALID,
 338                              _("Not a comic book MIME type: %s"),
 339                              mime_type);
 340                              return FALSE;
 341         }
 342         g_set_error_literal (error,
 343                              EV_DOCUMENT_ERROR,
 344                              EV_DOCUMENT_ERROR_INVALID,
 345                              _("Can't find an appropriate command to "
 346                              "decompress this type of comic book"));
 347         return FALSE;
 348 }
 349
 350 static int
 351 sort_page_names (gconstpointer a,
 352                  gconstpointer b)
 353 {
 354   return strcmp (* (const char **) a, * (const char **) b);
 355 }
 356
 357 static gboolean
 358 comics_document_load (EvDocument *document,
 359                       const char *uri,
 360                       GError    **error)
 361 {
 362         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 363         GSList *supported_extensions;
 364         gchar *std_out;
 365         gchar *mime_type;
 366         gchar **cb_files, *cb_file;
 367         gboolean success;
 368         int i, retval;
 369         GError *err = NULL;
 370
 371         comics_document->archive = g_filename_from_uri (uri, NULL, error);
 372         if (!comics_document->archive)
 373                 return FALSE;
 374
 375         mime_type = ev_file_get_mime_type (uri, FALSE, &err);
 376         if (!mime_type) {
 377                 if (err) {
 378                         g_propagate_error (error, err);
 379                 } else {
 380                         g_set_error_literal (error,
 381                                              EV_DOCUMENT_ERROR,
 382                                              EV_DOCUMENT_ERROR_INVALID,
 383                                              _("Unknown MIME Type"));
 384                 }
 385
 386                 return FALSE;
 387         }
 388
 389         if (!comics_check_decompress_command (mime_type, comics_document,
 390         error)) {
 391                 g_free (mime_type);
 392                 return FALSE;
 393         } else if (!comics_generate_command_lines (comics_document, error)) {
 394                    g_free (mime_type);
 395                 return FALSE;
 396         }
 397
 398         g_free (mime_type);
 399
 400         /* Get list of files in archive */
 401         success = g_spawn_command_line_sync (comics_document->list_command,
 402                                              &std_out, NULL, &retval, error);
 403
 404         if (!success) {
 405                 return FALSE;
 406         } else if (!WIFEXITED(retval) || WEXITSTATUS(retval) != EXIT_SUCCESS) {
 407                 g_set_error_literal (error,
 408                                      EV_DOCUMENT_ERROR,
 409                                      EV_DOCUMENT_ERROR_INVALID,
 410                                      _("File corrupted"));
 411                 return FALSE;
 412         }
 413
 414         /* FIXME: is this safe against filenames containing \n in the archive ? */
 415         cb_files = g_strsplit (std_out, "\n", 0);
 416         g_free (std_out);
 417
 418         if (!cb_files) {
 419                 g_set_error_literal (error,
 420                                      EV_DOCUMENT_ERROR,
 421                                      EV_DOCUMENT_ERROR_INVALID,
 422                                      _("No files in archive"));
 423                 return FALSE;
 424         }
 425
 426         comics_document->page_names = g_ptr_array_sized_new (64);
 427
 428         supported_extensions = get_supported_image_extensions ();
 429         for (i = 0; cb_files[i] != NULL; i++) {
 430                 if (comics_document->offset != NO_OFFSET) {
 431                         if (g_utf8_strlen (cb_files[i],-1) >
 432                             comics_document->offset) {
 433                                 cb_file =
 434                                         g_utf8_offset_to_pointer (cb_files[i],
 435                                                        comics_document->offset);
 436                         } else {
 437                                 continue;
 438                         }
 439                 } else {
 440                         cb_file = cb_files[i];
 441                 }
 442                 gchar *suffix = g_strrstr (cb_file, ".");
 443                 if (!suffix)
 444                         continue;
 445                 suffix = g_ascii_strdown (suffix + 1, -1);
 446                 if (g_slist_find_custom (supported_extensions, suffix,
 447                                          (GCompareFunc) strcmp) != NULL) {
 448                         g_ptr_array_add (comics_document->page_names,
 449                                          g_strstrip (g_strdup (cb_file)));
 450                 }
 451                 g_free (suffix);
 452         }
 453         g_strfreev (cb_files);
 454         g_slist_foreach (supported_extensions, (GFunc) g_free, NULL);
 455         g_slist_free (supported_extensions);
 456
 457         if (comics_document->page_names->len == 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         /* Now sort the pages */
 467         g_ptr_array_sort (comics_document->page_names, sort_page_names);
 468
 469         return TRUE;
 470 }
 471
 472
 473 static gboolean
 474 comics_document_save (EvDocument *document,
 475                       const char *uri,
 476                       GError    **error)
 477 {
 478         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 479
 480         return ev_xfer_uri_simple (comics_document->archive, uri, error);
 481 }
 482
 483 static int
 484 comics_document_get_n_pages (EvDocument *document)
 485 {
 486         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 487
 488         if (comics_document->page_names == NULL)
 489                 return 0;
 490
 491         return comics_document->page_names->len;
 492 }
 493
 494 static void
 495 comics_document_get_page_size (EvDocument *document,
 496                                EvPage     *page,
 497                                double     *width,
 498                                double     *height)
 499 {
 500         GdkPixbufLoader *loader;
 501         char **argv;
 502         guchar buf[1024];
 503         gboolean success, got_size = FALSE;
 504         gint outpipe = -1;
 505         GPid child_pid = -1;
 506         gssize bytes;
 507         GdkPixbuf *pixbuf;
 508         gchar *filename;
 509         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 510
 511         if (!comics_document->decompress_tmp) {
 512                 argv = extract_argv (document, page->index);
 513                 success = g_spawn_async_with_pipes (NULL, argv, NULL,
 514                                                     G_SPAWN_SEARCH_PATH |
 515                                                     G_SPAWN_STDERR_TO_DEV_NULL,
 516                                                     NULL, NULL,
 517                                                     &child_pid,
 518                                                     NULL, &outpipe, NULL, NULL);
 519                 g_strfreev (argv);
 520                 g_return_if_fail (success == TRUE);
 521
 522                 loader = gdk_pixbuf_loader_new ();
 523                 g_signal_connect (loader, "area-prepared",
 524                                   G_CALLBACK (get_page_size_area_prepared_cb),
 525                                   &got_size);
 526
 527                 while (outpipe >= 0) {
 528                         bytes = read (outpipe, buf, 1024);
 529
 530                         if (bytes > 0)
 531                         gdk_pixbuf_loader_write (loader, buf, bytes, NULL);
 532                         if (bytes <= 0 || got_size) {
 533                                 close (outpipe);
 534                                 outpipe = -1;
 535                                 gdk_pixbuf_loader_close (loader, NULL);
 536                         }
 537                 }
 538
 539                 if (gdk_pixbuf_loader_get_pixbuf (loader)) {
 540                         pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
 541                         if (width)
 542                                 *width = gdk_pixbuf_get_width (pixbuf);
 543                         if (height)
 544                                 *height = gdk_pixbuf_get_height (pixbuf);
 545                 }
 546
 547                 g_spawn_close_pid (child_pid);
 548                 g_object_unref (loader);
 549         } else {
 550                 filename = g_build_filename (comics_document->dir,
 551                                              (char *) comics_document->page_names->pdata[page->index],
 552                                              NULL);
 553                 pixbuf = gdk_pixbuf_new_from_file (filename, NULL);
 554                 g_free (filename);
 555                 if (width)
 556                         *width = gdk_pixbuf_get_width (pixbuf);
 557                 if (height)
 558                         *height = gdk_pixbuf_get_height (pixbuf);
 559         }
 560 }
 561
 562 static void
 563 get_page_size_area_prepared_cb (GdkPixbufLoader *loader,
 564                                 gpointer         data)
 565 {
 566         gboolean *got_size = data;
 567         *got_size = TRUE;
 568 }
 569
 570 static GdkPixbuf *
 571 comics_document_render_pixbuf (EvDocument      *document,
 572                                EvRenderContext *rc)
 573 {
 574         GdkPixbufLoader *loader;
 575         GdkPixbuf *rotated_pixbuf;
 576         char **argv;
 577         guchar buf[4096];
 578         gboolean success;
 579         gint outpipe = -1;
 580         GPid child_pid = -1;
 581         gssize bytes;
 582         gint width, height;
 583         gchar *filename;
 584         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 585
 586         if (!comics_document->decompress_tmp) {
 587                 argv = extract_argv (document, rc->page->index);
 588                 success = g_spawn_async_with_pipes (NULL, argv, NULL,
 589                                                     G_SPAWN_SEARCH_PATH |
 590                                                     G_SPAWN_STDERR_TO_DEV_NULL,
 591                                                     NULL, NULL,
 592                                                     &child_pid,
 593                                                     NULL, &outpipe, NULL, NULL);
 594                 g_strfreev (argv);
 595                 g_return_val_if_fail (success == TRUE, NULL);
 596
 597                 loader = gdk_pixbuf_loader_new ();
 598                 g_signal_connect (loader, "size-prepared",
 599                                   G_CALLBACK (render_pixbuf_size_prepared_cb),
 600                                   &rc->scale);
 601
 602                 while (outpipe >= 0) {
 603                         bytes = read (outpipe, buf, 4096);
 604
 605                         if (bytes > 0) {
 606                                 gdk_pixbuf_loader_write (loader, buf, bytes,
 607                                 NULL);
 608                         } else if (bytes <= 0) {
 609                                 close (outpipe);
 610                                 gdk_pixbuf_loader_close (loader, NULL);
 611                                 outpipe = -1;
 612                         }
 613                 }
 614
 615                 rotated_pixbuf = gdk_pixbuf_rotate_simple (
 616                                         gdk_pixbuf_loader_get_pixbuf (loader),
 617                                         360 - rc->rotation);
 618                 g_spawn_close_pid (child_pid);
 619                 g_object_unref (loader);
 620         } else {
 621                 filename =
 622                         g_build_filename (comics_document->dir,
 623                                           (char *) comics_document->page_names->pdata[rc->page->index],
 624                                           NULL);
 625
 626                 gdk_pixbuf_get_file_info (filename, &width, &height);
 627
 628                 rotated_pixbuf =
 629                   gdk_pixbuf_rotate_simple (gdk_pixbuf_new_from_file_at_size (
 630                                             filename, width * (rc->scale) + 0.5,
 631                                             height * (rc->scale) + 0.5, NULL),
 632                                             360 - rc->rotation);
 633                 g_free (filename);
 634
 635         }
 636         return rotated_pixbuf;
 637 }
 638
 639 static cairo_surface_t *
 640 comics_document_render (EvDocument      *document,
 641                         EvRenderContext *rc)
 642 {
 643         GdkPixbuf       *pixbuf;
 644         cairo_surface_t *surface;
 645
 646         pixbuf = comics_document_render_pixbuf (document, rc);
 647         surface = ev_document_misc_surface_from_pixbuf (pixbuf);
 648         g_object_unref (pixbuf);
 649
 650         return surface;
 651 }
 652
 653 static void
 654 render_pixbuf_size_prepared_cb (GdkPixbufLoader *loader,
 655                                 gint             width,
 656                                 gint             height,
 657                                 gpointer         data)
 658 {
 659         double *scale = data;
 660         int w = (width  * (*scale) + 0.5);
 661         int h = (height * (*scale) + 0.5);
 662
 663         gdk_pixbuf_loader_set_size (loader, w, h);
 664 }
 665
 666 /**
 667  * comics_remove_dir: Removes a directory recursively.
 668  * Returns:
 669  *      0 if it was successfully deleted,
 670  *      -1 if an error occurred
 671  */
 672 static int
 673 comics_remove_dir (gchar *path_name)
 674 {
 675         GDir  *content_dir;
 676         const gchar *filename;
 677         gchar *filename_with_path;
 678
 679         if (g_file_test (path_name, G_FILE_TEST_IS_DIR)) {
 680                 content_dir = g_dir_open  (path_name, 0, NULL);
 681                 filename  = g_dir_read_name (content_dir);
 682                 while (filename) {
 683                         filename_with_path =
 684                                 g_build_filename (path_name,
 685                                                   filename, NULL);
 686                         comics_remove_dir (filename_with_path);
 687                         g_free (filename_with_path);
 688                         filename = g_dir_read_name (content_dir);
 689                 }
 690                 g_dir_close (content_dir);
 691         }
 692         /* Note from g_remove() documentation: on Windows, it is in general not
 693          * possible to remove a file that is open to some process, or mapped
 694          * into memory.*/
 695         return (g_remove (path_name));
 696 }
 697
 698 static void
 699 comics_document_finalize (GObject *object)
 700 {
 701         ComicsDocument *comics_document = COMICS_DOCUMENT (object);
 702
 703         if (comics_document->decompress_tmp) {
 704                 if (comics_remove_dir (comics_document->dir) == -1)
 705                         g_warning (_("There was an error deleting “%s”."),
 706                                    comics_document->dir);
 707                 g_free (comics_document->dir);
 708         }
 709
 710         if (comics_document->page_names) {
 711                 g_ptr_array_foreach (comics_document->page_names, (GFunc) g_free, NULL);
 712                 g_ptr_array_free (comics_document->page_names, TRUE);
 713         }
 714
 715         g_free (comics_document->archive);
 716         g_free (comics_document->selected_command);
 717         g_free (comics_document->extract_command);
 718         g_free (comics_document->list_command);
 719
 720         G_OBJECT_CLASS (comics_document_parent_class)->finalize (object);
 721 }
 722
 723 static void
 724 comics_document_class_init (ComicsDocumentClass *klass)
 725 {
 726         GObjectClass    *gobject_class = G_OBJECT_CLASS (klass);
 727         EvDocumentClass *ev_document_class = EV_DOCUMENT_CLASS (klass);
 728
 729         gobject_class->finalize = comics_document_finalize;
 730
 731         ev_document_class->load = comics_document_load;
 732         ev_document_class->save = comics_document_save;
 733         ev_document_class->get_n_pages = comics_document_get_n_pages;
 734         ev_document_class->get_page_size = comics_document_get_page_size;
 735         ev_document_class->render = comics_document_render;
 736 }
 737
 738 static void
 739 comics_document_init (ComicsDocument *comics_document)
 740 {
 741         comics_document->archive = NULL;
 742         comics_document->page_names = NULL;
 743         comics_document->extract_command = NULL;
 744 }
 745
 746 /* Returns a list of file extensions supported by gdk-pixbuf */
 747 static GSList*
 748 get_supported_image_extensions()
 749 {
 750         GSList *extensions = NULL;
 751         GSList *formats = gdk_pixbuf_get_formats ();
 752         GSList *l;
 753
 754         for (l = formats; l != NULL; l = l->next) {
 755                 int i;
 756                 gchar **ext = gdk_pixbuf_format_get_extensions (l->data);
 757
 758                 for (i = 0; ext[i] != NULL; i++) {
 759                         extensions = g_slist_append (extensions,
 760                                                      g_strdup (ext[i]));
 761                 }
 762
 763                 g_strfreev (ext);
 764         }
 765
 766         g_slist_free (formats);
 767         return extensions;
 768 }
 769
 770 static GdkPixbuf *
 771 comics_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document,
 772                                           EvRenderContext      *rc,
 773                                           gboolean              border)
 774 {
 775         GdkPixbuf *thumbnail;
 776
 777         thumbnail = comics_document_render_pixbuf (EV_DOCUMENT (document), rc);
 778
 779         if (border) {
 780               GdkPixbuf *tmp_pixbuf = thumbnail;
 781
 782               thumbnail = ev_document_misc_get_thumbnail_frame (-1, -1, tmp_pixbuf);
 783               g_object_unref (tmp_pixbuf);
 784         }
 785
 786         return thumbnail;
 787 }
 788
 789 static void
 790 comics_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 791                                            EvRenderContext      *rc,
 792                                            gint                 *width,
 793                                            gint                 *height)
 794 {
 795         gdouble page_width, page_height;
 796
 797         comics_document_get_page_size (EV_DOCUMENT (document), rc->page,
 798                                        &page_width, &page_height);
 799
 800         if (rc->rotation == 90 || rc->rotation == 270) {
 801                 *width = (gint) (page_height * rc->scale);
 802                 *height = (gint) (page_width * rc->scale);
 803         } else {
 804                 *width = (gint) (page_width * rc->scale);
 805                 *height = (gint) (page_height * rc->scale);
 806         }
 807 }
 808
 809 static void
 810 comics_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
 811 {
 812         iface->get_thumbnail = comics_document_thumbnails_get_thumbnail;
 813         iface->get_dimensions = comics_document_thumbnails_get_dimensions;
 814 }
 815
 816 static char**
 817 extract_argv (EvDocument *document, gint page)
 818 {
 819         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 820         char **argv;
 821         char *command_line, *quoted_archive, *quoted_filename;
 822         GError *err = NULL;
 823
 824         if (page >= comics_document->page_names->len)
 825                 return NULL;
 826
 827         quoted_archive = g_shell_quote (comics_document->archive);
 828         quoted_filename = g_shell_quote (comics_document->page_names->pdata[page]);
 829
 830         command_line = g_strdup_printf ("%s %s %s",
 831                                         comics_document->extract_command,
 832                                         quoted_archive,
 833                                         quoted_filename);
 834         g_shell_parse_argv (command_line, NULL, &argv, &err);
 835
 836         if (err) {
 837                 g_warning (_("Error %s"), err->message);
 838                 g_error_free (err);
 839                 return NULL;
 840         }
 841
 842         g_free (command_line);
 843         g_free (quoted_archive);
 844         g_free (quoted_filename);
 845         return argv;
 846 }