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         gchar *quoted_command;
 190         ComicBookDecompressType type;
 191
 192         type = comics_document->command_usage;
 193         quoted_file = g_shell_quote (comics_document->archive);
 194         quoted_command = g_shell_quote (comics_document->selected_command);
 195
 196         comics_document->extract_command =
 197                             g_strdup_printf (command_usage_def[type].extract,
 198                                              quoted_command);
 199         comics_document->list_command =
 200                             g_strdup_printf (command_usage_def[type].list,
 201                                              quoted_command, quoted_file);
 202         comics_document->offset = command_usage_def[type].offset;
 203         if (command_usage_def[type].decompress_tmp) {
 204                 comics_document->dir = ev_mkdtemp ("evince-comics-XXXXXX", error);
 205                 if (comics_document->dir == NULL)
 206                         return FALSE;
 207
 208                 /* unrar-free can't create directories, but ev_mkdtemp already created the dir */
 209
 210                 comics_document->decompress_tmp =
 211                         g_strdup_printf (command_usage_def[type].decompress_tmp,
 212                                          quoted_command, quoted_file,
 213                                          comics_document->dir);
 214                 g_free (quoted_file);
 215                 g_free (quoted_command);
 216
 217                 if (!comics_decompress_temp_dir (comics_document->decompress_tmp,
 218                     comics_document->selected_command, error))
 219                         return FALSE;
 220                 else
 221                         return TRUE;
 222         } else {
 223                 g_free (quoted_file);
 224                 g_free (quoted_command);
 225                 return TRUE;
 226         }
 227
 228 }
 229
 230 /* This function chooses an external command for decompressing a comic
 231  * book based on its mime tipe. */
 232 static gboolean
 233 comics_check_decompress_command (gchar          *mime_type,
 234                                  ComicsDocument *comics_document,
 235                                  GError         **error)
 236 {
 237         gboolean success;
 238         gchar *std_out, *std_err;
 239         gint retval;
 240         GError *err = NULL;
 241
 242         /* FIXME, use proper cbr/cbz mime types once they're
 243          * included in shared-mime-info */
 244
 245         if (!strcmp (mime_type, "application/x-cbr") ||
 246             !strcmp (mime_type, "application/x-rar")) {
 247                 /* The RARLAB provides a no-charge proprietary (freeware)
 248                 * decompress-only client for Linux called unrar. Another
 249                 * option is a GPLv2-licensed command-line tool developed by
 250                 * the Gna! project. Confusingly enough, the free software RAR
 251                 * decoder is also named unrar. For this reason we need to add
 252                 * some lines for disambiguation. Sorry for the added the
 253                 * complexity but it's life :)
 254                 * Finally, some distributions, like Debian, rename this free
 255                 * option as unrar-free.
 256                 * */
 257                 comics_document->selected_command =
 258                                         g_find_program_in_path ("unrar");
 259                 if (comics_document->selected_command) {
 260                         /* We only use std_err to avoid printing useless error
 261                          * messages on the terminal */
 262                         success =
 263                                 g_spawn_command_line_sync (
 264                                               comics_document->selected_command,
 265                                                            &std_out, &std_err,
 266                                                            &retval, &err);
 267                         if (!success) {
 268                                 g_propagate_error (error, err);
 269                                 g_error_free (err);
 270                                 return FALSE;
 271                         /* I don't check retval status because RARLAB unrar
 272                          * doesn't have a way to return 0 without involving an
 273                          * operation with a file*/
 274                         } else if (WIFEXITED (retval)) {
 275                                 if (g_strrstr (std_out,"freeware") != NULL)
 276                                         /* The RARLAB freeware client */
 277                                         comics_document->command_usage = RARLABS;
 278                                 else
 279                                         /* The Gna! free software client */
 280                                         comics_document->command_usage = GNAUNRAR;
 281
 282                                 g_free (std_out);
 283                                 g_free (std_err);
 284                                 return TRUE;
 285                         }
 286                 }
 287                 /* The Gna! free software client with Debian naming convention */
 288                 comics_document->selected_command =
 289                                 g_find_program_in_path ("unrar-free");
 290                 if (comics_document->selected_command) {
 291                         comics_document->command_usage = GNAUNRAR;
 292                         return TRUE;
 293                 }
 294
 295         } else if (!strcmp (mime_type, "application/x-cbz") ||
 296                    !strcmp (mime_type, "application/zip")) {
 297                 /* InfoZIP's unzip program */
 298                 comics_document->selected_command =
 299                                 g_find_program_in_path ("unzip");
 300                 if (comics_document->selected_command) {
 301                         comics_document->command_usage = UNZIP;
 302                         return TRUE;
 303                 }
 304
 305         } else if (!strcmp (mime_type, "application/x-cb7") ||
 306                    !strcmp (mime_type, "application/x-7z-compressed")) {
 307                 /* 7zr, 7za and 7z are the commands from the p7zip project able
 308                  * to decompress .7z files */
 309                         comics_document->selected_command =
 310                                 g_find_program_in_path ("7zr");
 311                         if (comics_document->selected_command) {
 312                                 comics_document->command_usage = P7ZIP;
 313                                 return TRUE;
 314                         }
 315                         comics_document->selected_command =
 316                                 g_find_program_in_path ("7za");
 317                         if (comics_document->selected_command) {
 318                                 comics_document->command_usage = P7ZIP;
 319                                 return TRUE;
 320                         }
 321                         comics_document->selected_command =
 322                                 g_find_program_in_path ("7z");
 323                         if (comics_document->selected_command) {
 324                                 comics_document->command_usage = P7ZIP;
 325                                 return TRUE;
 326                         }
 327         } else if (!strcmp (mime_type, "application/x-cbt") ||
 328                    !strcmp (mime_type, "application/x-tar")) {
 329                 /* tar utility (Tape ARchive) */
 330                 comics_document->selected_command =
 331                                 g_find_program_in_path ("tar");
 332                 if (comics_document->selected_command) {
 333                         comics_document->command_usage = TAR;
 334                         return TRUE;
 335                 }
 336         } else {
 337                 g_set_error (error,
 338                              EV_DOCUMENT_ERROR,
 339                              EV_DOCUMENT_ERROR_INVALID,
 340                              _("Not a comic book MIME type: %s"),
 341                              mime_type);
 342                              return FALSE;
 343         }
 344         g_set_error_literal (error,
 345                              EV_DOCUMENT_ERROR,
 346                              EV_DOCUMENT_ERROR_INVALID,
 347                              _("Can't find an appropriate command to "
 348                              "decompress this type of comic book"));
 349         return FALSE;
 350 }
 351
 352 static int
 353 sort_page_names (gconstpointer a,
 354                  gconstpointer b)
 355 {
 356   return strcmp (* (const char **) a, * (const char **) b);
 357 }
 358
 359 static gboolean
 360 comics_document_load (EvDocument *document,
 361                       const char *uri,
 362                       GError    **error)
 363 {
 364         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 365         GSList *supported_extensions;
 366         gchar *std_out;
 367         gchar *mime_type;
 368         gchar **cb_files, *cb_file;
 369         gboolean success;
 370         int i, retval;
 371         GError *err = NULL;
 372
 373         comics_document->archive = g_filename_from_uri (uri, NULL, error);
 374         if (!comics_document->archive)
 375                 return FALSE;
 376
 377         mime_type = ev_file_get_mime_type (uri, FALSE, &err);
 378         if (!mime_type) {
 379                 if (err) {
 380                         g_propagate_error (error, err);
 381                 } else {
 382                         g_set_error_literal (error,
 383                                              EV_DOCUMENT_ERROR,
 384                                              EV_DOCUMENT_ERROR_INVALID,
 385                                              _("Unknown MIME Type"));
 386                 }
 387
 388                 return FALSE;
 389         }
 390
 391         if (!comics_check_decompress_command (mime_type, comics_document,
 392         error)) {
 393                 g_free (mime_type);
 394                 return FALSE;
 395         } else if (!comics_generate_command_lines (comics_document, error)) {
 396                    g_free (mime_type);
 397                 return FALSE;
 398         }
 399
 400         g_free (mime_type);
 401
 402         /* Get list of files in archive */
 403         success = g_spawn_command_line_sync (comics_document->list_command,
 404                                              &std_out, NULL, &retval, error);
 405
 406         if (!success) {
 407                 return FALSE;
 408         } else if (!WIFEXITED(retval) || WEXITSTATUS(retval) != EXIT_SUCCESS) {
 409                 g_set_error_literal (error,
 410                                      EV_DOCUMENT_ERROR,
 411                                      EV_DOCUMENT_ERROR_INVALID,
 412                                      _("File corrupted"));
 413                 return FALSE;
 414         }
 415
 416         /* FIXME: is this safe against filenames containing \n in the archive ? */
 417         cb_files = g_strsplit (std_out, "\n", 0);
 418         g_free (std_out);
 419
 420         if (!cb_files) {
 421                 g_set_error_literal (error,
 422                                      EV_DOCUMENT_ERROR,
 423                                      EV_DOCUMENT_ERROR_INVALID,
 424                                      _("No files in archive"));
 425                 return FALSE;
 426         }
 427
 428         comics_document->page_names = g_ptr_array_sized_new (64);
 429
 430         supported_extensions = get_supported_image_extensions ();
 431         for (i = 0; cb_files[i] != NULL; i++) {
 432                 if (comics_document->offset != NO_OFFSET) {
 433                         if (g_utf8_strlen (cb_files[i],-1) >
 434                             comics_document->offset) {
 435                                 cb_file =
 436                                         g_utf8_offset_to_pointer (cb_files[i],
 437                                                        comics_document->offset);
 438                         } else {
 439                                 continue;
 440                         }
 441                 } else {
 442                         cb_file = cb_files[i];
 443                 }
 444                 gchar *suffix = g_strrstr (cb_file, ".");
 445                 if (!suffix)
 446                         continue;
 447                 suffix = g_ascii_strdown (suffix + 1, -1);
 448                 if (g_slist_find_custom (supported_extensions, suffix,
 449                                          (GCompareFunc) strcmp) != NULL) {
 450                         g_ptr_array_add (comics_document->page_names,
 451                                          g_strstrip (g_strdup (cb_file)));
 452                 }
 453                 g_free (suffix);
 454         }
 455         g_strfreev (cb_files);
 456         g_slist_foreach (supported_extensions, (GFunc) g_free, NULL);
 457         g_slist_free (supported_extensions);
 458
 459         if (comics_document->page_names->len == 0) {
 460                 g_set_error (error,
 461                              EV_DOCUMENT_ERROR,
 462                              EV_DOCUMENT_ERROR_INVALID,
 463                              _("No images found in archive %s"),
 464                              uri);
 465                 return FALSE;
 466         }
 467
 468         /* Now sort the pages */
 469         g_ptr_array_sort (comics_document->page_names, sort_page_names);
 470
 471         return TRUE;
 472 }
 473
 474
 475 static gboolean
 476 comics_document_save (EvDocument *document,
 477                       const char *uri,
 478                       GError    **error)
 479 {
 480         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 481
 482         return ev_xfer_uri_simple (comics_document->archive, uri, error);
 483 }
 484
 485 static int
 486 comics_document_get_n_pages (EvDocument *document)
 487 {
 488         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 489
 490         if (comics_document->page_names == NULL)
 491                 return 0;
 492
 493         return comics_document->page_names->len;
 494 }
 495
 496 static void
 497 comics_document_get_page_size (EvDocument *document,
 498                                EvPage     *page,
 499                                double     *width,
 500                                double     *height)
 501 {
 502         GdkPixbufLoader *loader;
 503         char **argv;
 504         guchar buf[1024];
 505         gboolean success, got_size = FALSE;
 506         gint outpipe = -1;
 507         GPid child_pid;
 508         gssize bytes;
 509         GdkPixbuf *pixbuf;
 510         gchar *filename;
 511         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 512
 513         if (!comics_document->decompress_tmp) {
 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 *) comics_document->page_names->pdata[page->index],
 554                                              NULL);
 555                 pixbuf = gdk_pixbuf_new_from_file (filename, NULL);
 556                 g_free (filename);
 557                 if (width)
 558                         *width = gdk_pixbuf_get_width (pixbuf);
 559                 if (height)
 560                         *height = gdk_pixbuf_get_height (pixbuf);
 561         }
 562 }
 563
 564 static void
 565 get_page_size_area_prepared_cb (GdkPixbufLoader *loader,
 566                                 gpointer         data)
 567 {
 568         gboolean *got_size = data;
 569         *got_size = TRUE;
 570 }
 571
 572 static GdkPixbuf *
 573 comics_document_render_pixbuf (EvDocument      *document,
 574                                EvRenderContext *rc)
 575 {
 576         GdkPixbufLoader *loader;
 577         GdkPixbuf *rotated_pixbuf;
 578         char **argv;
 579         guchar buf[4096];
 580         gboolean success;
 581         gint outpipe = -1;
 582         GPid child_pid;
 583         gssize bytes;
 584         gint width, height;
 585         gchar *filename;
 586         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 587
 588         if (!comics_document->decompress_tmp) {
 589                 argv = extract_argv (document, rc->page->index);
 590                 success = g_spawn_async_with_pipes (NULL, argv, NULL,
 591                                                     G_SPAWN_SEARCH_PATH |
 592                                                     G_SPAWN_STDERR_TO_DEV_NULL,
 593                                                     NULL, NULL,
 594                                                     &child_pid,
 595                                                     NULL, &outpipe, NULL, NULL);
 596                 g_strfreev (argv);
 597                 g_return_val_if_fail (success == TRUE, NULL);
 598
 599                 loader = gdk_pixbuf_loader_new ();
 600                 g_signal_connect (loader, "size-prepared",
 601                                   G_CALLBACK (render_pixbuf_size_prepared_cb),
 602                                   &rc->scale);
 603
 604                 while (outpipe >= 0) {
 605                         bytes = read (outpipe, buf, 4096);
 606
 607                         if (bytes > 0) {
 608                                 gdk_pixbuf_loader_write (loader, buf, bytes,
 609                                 NULL);
 610                         } else if (bytes <= 0) {
 611                                 close (outpipe);
 612                                 gdk_pixbuf_loader_close (loader, NULL);
 613                                 outpipe = -1;
 614                         }
 615                 }
 616
 617                 rotated_pixbuf = gdk_pixbuf_rotate_simple (
 618                                         gdk_pixbuf_loader_get_pixbuf (loader),
 619                                         360 - rc->rotation);
 620                 g_spawn_close_pid (child_pid);
 621                 g_object_unref (loader);
 622         } else {
 623                 filename =
 624                         g_build_filename (comics_document->dir,
 625                                           (char *) comics_document->page_names->pdata[rc->page->index],
 626                                           NULL);
 627
 628                 gdk_pixbuf_get_file_info (filename, &width, &height);
 629
 630                 rotated_pixbuf =
 631                   gdk_pixbuf_rotate_simple (gdk_pixbuf_new_from_file_at_size (
 632                                             filename, width * (rc->scale) + 0.5,
 633                                             height * (rc->scale) + 0.5, NULL),
 634                                             360 - rc->rotation);
 635                 g_free (filename);
 636
 637         }
 638         return rotated_pixbuf;
 639 }
 640
 641 static cairo_surface_t *
 642 comics_document_render (EvDocument      *document,
 643                         EvRenderContext *rc)
 644 {
 645         GdkPixbuf       *pixbuf;
 646         cairo_surface_t *surface;
 647
 648         pixbuf = comics_document_render_pixbuf (document, rc);
 649         surface = ev_document_misc_surface_from_pixbuf (pixbuf);
 650         g_object_unref (pixbuf);
 651
 652         return surface;
 653 }
 654
 655 static void
 656 render_pixbuf_size_prepared_cb (GdkPixbufLoader *loader,
 657                                 gint             width,
 658                                 gint             height,
 659                                 gpointer         data)
 660 {
 661         double *scale = data;
 662         int w = (width  * (*scale) + 0.5);
 663         int h = (height * (*scale) + 0.5);
 664
 665         gdk_pixbuf_loader_set_size (loader, w, h);
 666 }
 667
 668 /**
 669  * comics_remove_dir: Removes a directory recursively.
 670  * Returns:
 671  *      0 if it was successfully deleted,
 672  *      -1 if an error occurred
 673  */
 674 static int
 675 comics_remove_dir (gchar *path_name)
 676 {
 677         GDir  *content_dir;
 678         const gchar *filename;
 679         gchar *filename_with_path;
 680
 681         if (g_file_test (path_name, G_FILE_TEST_IS_DIR)) {
 682                 content_dir = g_dir_open  (path_name, 0, NULL);
 683                 filename  = g_dir_read_name (content_dir);
 684                 while (filename) {
 685                         filename_with_path =
 686                                 g_build_filename (path_name,
 687                                                   filename, NULL);
 688                         comics_remove_dir (filename_with_path);
 689                         g_free (filename_with_path);
 690                         filename = g_dir_read_name (content_dir);
 691                 }
 692                 g_dir_close (content_dir);
 693         }
 694         /* Note from g_remove() documentation: on Windows, it is in general not
 695          * possible to remove a file that is open to some process, or mapped
 696          * into memory.*/
 697         return (g_remove (path_name));
 698 }
 699
 700 static void
 701 comics_document_finalize (GObject *object)
 702 {
 703         ComicsDocument *comics_document = COMICS_DOCUMENT (object);
 704
 705         if (comics_document->decompress_tmp) {
 706                 if (comics_remove_dir (comics_document->dir) == -1)
 707                         g_warning (_("There was an error deleting “%s”."),
 708                                    comics_document->dir);
 709                 g_free (comics_document->dir);
 710         }
 711
 712         if (comics_document->page_names) {
 713                 g_ptr_array_foreach (comics_document->page_names, (GFunc) g_free, NULL);
 714                 g_ptr_array_free (comics_document->page_names, TRUE);
 715         }
 716
 717         g_free (comics_document->archive);
 718         g_free (comics_document->selected_command);
 719         g_free (comics_document->extract_command);
 720         g_free (comics_document->list_command);
 721
 722         G_OBJECT_CLASS (comics_document_parent_class)->finalize (object);
 723 }
 724
 725 static void
 726 comics_document_class_init (ComicsDocumentClass *klass)
 727 {
 728         GObjectClass    *gobject_class = G_OBJECT_CLASS (klass);
 729         EvDocumentClass *ev_document_class = EV_DOCUMENT_CLASS (klass);
 730
 731         gobject_class->finalize = comics_document_finalize;
 732
 733         ev_document_class->load = comics_document_load;
 734         ev_document_class->save = comics_document_save;
 735         ev_document_class->get_n_pages = comics_document_get_n_pages;
 736         ev_document_class->get_page_size = comics_document_get_page_size;
 737         ev_document_class->render = comics_document_render;
 738 }
 739
 740 static void
 741 comics_document_init (ComicsDocument *comics_document)
 742 {
 743         comics_document->archive = NULL;
 744         comics_document->page_names = NULL;
 745         comics_document->extract_command = NULL;
 746 }
 747
 748 /* Returns a list of file extensions supported by gdk-pixbuf */
 749 static GSList*
 750 get_supported_image_extensions()
 751 {
 752         GSList *extensions = NULL;
 753         GSList *formats = gdk_pixbuf_get_formats ();
 754         GSList *l;
 755
 756         for (l = formats; l != NULL; l = l->next) {
 757                 int i;
 758                 gchar **ext = gdk_pixbuf_format_get_extensions (l->data);
 759
 760                 for (i = 0; ext[i] != NULL; i++) {
 761                         extensions = g_slist_append (extensions,
 762                                                      g_strdup (ext[i]));
 763                 }
 764
 765                 g_strfreev (ext);
 766         }
 767
 768         g_slist_free (formats);
 769         return extensions;
 770 }
 771
 772 static GdkPixbuf *
 773 comics_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document,
 774                                           EvRenderContext      *rc,
 775                                           gboolean              border)
 776 {
 777         GdkPixbuf *thumbnail;
 778
 779         thumbnail = comics_document_render_pixbuf (EV_DOCUMENT (document), rc);
 780
 781         if (border) {
 782               GdkPixbuf *tmp_pixbuf = thumbnail;
 783
 784               thumbnail = ev_document_misc_get_thumbnail_frame (-1, -1, tmp_pixbuf);
 785               g_object_unref (tmp_pixbuf);
 786         }
 787
 788         return thumbnail;
 789 }
 790
 791 static void
 792 comics_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 793                                            EvRenderContext      *rc,
 794                                            gint                 *width,
 795                                            gint                 *height)
 796 {
 797         gdouble page_width, page_height;
 798
 799         comics_document_get_page_size (EV_DOCUMENT (document), rc->page,
 800                                        &page_width, &page_height);
 801
 802         if (rc->rotation == 90 || rc->rotation == 270) {
 803                 *width = (gint) (page_height * rc->scale);
 804                 *height = (gint) (page_width * rc->scale);
 805         } else {
 806                 *width = (gint) (page_width * rc->scale);
 807                 *height = (gint) (page_height * rc->scale);
 808         }
 809 }
 810
 811 static void
 812 comics_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
 813 {
 814         iface->get_thumbnail = comics_document_thumbnails_get_thumbnail;
 815         iface->get_dimensions = comics_document_thumbnails_get_dimensions;
 816 }
 817
 818 static char**
 819 extract_argv (EvDocument *document, gint page)
 820 {
 821         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 822         char **argv;
 823         char *command_line, *quoted_archive, *quoted_filename;
 824         GError *err = NULL;
 825
 826         if (page >= comics_document->page_names->len)
 827                 return NULL;
 828
 829         quoted_archive = g_shell_quote (comics_document->archive);
 830         quoted_filename = g_shell_quote (comics_document->page_names->pdata[page]);
 831
 832         command_line = g_strdup_printf ("%s %s %s",
 833                                         comics_document->extract_command,
 834                                         quoted_archive,
 835                                         quoted_filename);
 836         g_shell_parse_argv (command_line, NULL, &argv, &err);
 837
 838         if (err) {
 839                 g_warning (_("Error %s"), err->message);
 840                 g_error_free (err);
 841                 return NULL;
 842         }
 843
 844         g_free (command_line);
 845         g_free (quoted_archive);
 846         g_free (quoted_filename);
 847         return argv;
 848 }