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 <sys/wait.h>
  26 #include <stdlib.h>
  27 #include <errno.h>
  28
  29 #include <glib.h>
  30 #include <glib/gi18n-lib.h>
  31 #include <glib/gstdio.h>
  32 #include <gio/gio.h>
  33
  34 #include "comics-document.h"
  35 #include "ev-document-misc.h"
  36 #include "ev-document-thumbnails.h"
  37 #include "ev-file-helpers.h"
  38
  39 typedef enum
  40 {
  41         RARLABS,
  42         GNAUNRAR,
  43         UNZIP,
  44         P7ZIP,
  45         TAR
  46 } ComicBookDecompressType;
  47
  48 typedef struct _ComicsDocumentClass ComicsDocumentClass;
  49
  50 struct _ComicsDocumentClass
  51 {
  52         EvDocumentClass parent_class;
  53 };
  54
  55 struct _ComicsDocument
  56 {
  57         EvDocument parent_instance;
  58
  59         gchar    *archive, *dir;
  60         GPtrArray *page_names;
  61         gchar    *selected_command;
  62         gchar    *extract_command, *list_command, *decompress_tmp;
  63         gint     offset;
  64         ComicBookDecompressType command_usage;
  65 };
  66
  67 #define OFFSET_7Z 53
  68 #define NO_OFFSET 0
  69
  70 /* For perfomance reasons of 7z* we've choosen to decompress on the temporary
  71  * directory instead of decompressing on the stdout */
  72
  73 /**
  74  * @extract: command line arguments to pass to extract a file from the archive
  75  *   to stdout.
  76  * @list: command line arguments to list the archive contents
  77  * @decompress_tmp: command line arguments to pass to extract the archive
  78  *   into a directory.
  79  * @offset: the position offset of the filename on each line in the output of
  80  *   running the @list command
  81  */
  82 typedef struct {
  83         char *extract;
  84         char *list;
  85         char *decompress_tmp;
  86         gint offset;
  87 } ComicBookDecompressCommand;
  88
  89 static const ComicBookDecompressCommand command_usage_def[] = {
  90         /* RARLABS unrar */
  91         {"%s p -c- -ierr --", "%s vb -c- -- %s", NULL             , NO_OFFSET},
  92
  93         /* GNA! unrar */
  94         {NULL               , "%s t %s"        , "%s -xf %s %s"   , NO_OFFSET},
  95
  96         /* unzip */
  97         {"%s -p -C --"      , "%s -Z -1 -- %s" , NULL             , NO_OFFSET},
  98
  99         /* 7zip */
 100         {NULL               , "%s l -- %s"     , "%s x -y %s -o%s", OFFSET_7Z},
 101
 102         /* tar */
 103         {"%s -xOf"          , "%s -tf %s"      , NULL             , NO_OFFSET}
 104 };
 105
 106 static void       comics_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface);
 107
 108 static GSList*    get_supported_image_extensions (void);
 109 static void       get_page_size_area_prepared_cb (GdkPixbufLoader *loader,
 110                                                   gpointer data);
 111 static void       render_pixbuf_size_prepared_cb (GdkPixbufLoader *loader,
 112                                                   gint width,
 113                                                   gint height,
 114                                                   gpointer data);
 115 static char**     extract_argv                   (EvDocument *document,
 116                                                   gint page);
 117
 118
 119 EV_BACKEND_REGISTER_WITH_CODE (ComicsDocument, comics_document,
 120         {
 121                 EV_BACKEND_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_THUMBNAILS,
 122                                                 comics_document_document_thumbnails_iface_init);
 123         } );
 124
 125
 126 /* This function manages the command for decompressing a comic book */
 127 static gboolean
 128 comics_decompress_temp_dir (const gchar *command_decompress_tmp,
 129                             const gchar *command,
 130                             GError      **error)
 131 {
 132         gboolean success;
 133         gchar *std_out, *basename;
 134         GError *err = NULL;
 135         gint retval;
 136
 137         success = g_spawn_command_line_sync (command_decompress_tmp, &std_out,
 138                                              NULL, &retval, &err);
 139         basename = g_path_get_basename (command);
 140         if (!success) {
 141                 g_set_error (error,
 142                              EV_DOCUMENT_ERROR,
 143                              EV_DOCUMENT_ERROR_INVALID,
 144                              _("Error launching the command “%s” in order to "
 145                              "decompress the comic book: %s"),
 146                              basename,
 147                              err->message);
 148                 g_error_free (err);
 149         } else if (WIFEXITED (retval)) {
 150                 if (WEXITSTATUS (retval) == EXIT_SUCCESS) {
 151                         g_free (std_out);
 152                         g_free (basename);
 153                         return TRUE;
 154                 } else {
 155                         g_set_error (error,
 156                                      EV_DOCUMENT_ERROR,
 157                                      EV_DOCUMENT_ERROR_INVALID,
 158                                      _("The command “%s” failed at "
 159                                      "decompressing the comic book."),
 160                                      basename);
 161                         g_free (std_out);
 162                 }
 163         } else {
 164                 g_set_error (error,
 165                              EV_DOCUMENT_ERROR,
 166                              EV_DOCUMENT_ERROR_INVALID,
 167                              _("The command “%s” did not end normally."),
 168                              basename);
 169                 g_free (std_out);
 170         }
 171         g_free (basename);
 172         return FALSE;
 173 }
 174
 175 /* This function shows how to use the choosen command for decompressing a
 176  * comic book file. It modifies fields of the ComicsDocument struct with
 177  * this information */
 178 static gboolean
 179 comics_generate_command_lines (ComicsDocument *comics_document,
 180                                GError         **error)
 181 {
 182         gchar *quoted_file;
 183         ComicBookDecompressType type;
 184
 185         type = comics_document->command_usage;
 186         quoted_file = g_shell_quote (comics_document->archive);
 187
 188         comics_document->extract_command =
 189                             g_strdup_printf (command_usage_def[type].extract,
 190                                              comics_document->selected_command);
 191         comics_document->list_command =
 192                             g_strdup_printf (command_usage_def[type].list,
 193                                              comics_document->selected_command,
 194                                              quoted_file);
 195         comics_document->offset = command_usage_def[type].offset;
 196         if (command_usage_def[type].decompress_tmp) {
 197                 comics_document->dir = ev_mkdtemp ("evince-comics-XXXXXX", error);
 198                 if (comics_document->dir == NULL)
 199                         return FALSE;
 200
 201                 /* unrar-free can't create directories, but ev_mkdtemp already created the dir */
 202
 203                 comics_document->decompress_tmp =
 204                         g_strdup_printf (command_usage_def[type].decompress_tmp,
 205                                          comics_document->selected_command,
 206                                          quoted_file,
 207                                          comics_document->dir);
 208                 g_free (quoted_file);
 209
 210                 if (!comics_decompress_temp_dir (comics_document->decompress_tmp,
 211                     comics_document->selected_command, error))
 212                         return FALSE;
 213                 else
 214                         return TRUE;
 215         } else {
 216                 g_free (quoted_file);
 217                 return TRUE;
 218         }
 219
 220 }
 221
 222 /* This function chooses an external command for decompressing a comic
 223  * book based on its mime tipe. */
 224 static gboolean
 225 comics_check_decompress_command (gchar          *mime_type,
 226                                  ComicsDocument *comics_document,
 227                                  GError         **error)
 228 {
 229         gboolean success;
 230         gchar *std_out, *std_err;
 231         gint retval;
 232         GError *err = NULL;
 233
 234         /* FIXME, use proper cbr/cbz mime types once they're
 235          * included in shared-mime-info */
 236
 237         if (!strcmp (mime_type, "application/x-cbr") ||
 238             !strcmp (mime_type, "application/x-rar")) {
 239                 /* The RARLAB provides a no-charge proprietary (freeware)
 240                 * decompress-only client for Linux called unrar. Another
 241                 * option is a GPLv2-licensed command-line tool developed by
 242                 * the Gna! project. Confusingly enough, the free software RAR
 243                 * decoder is also named unrar. For this reason we need to add
 244                 * some lines for disambiguation. Sorry for the added the
 245                 * complexity but it's life :)
 246                 * Finally, some distributions, like Debian, rename this free
 247                 * option as unrar-free.
 248                 * */
 249                 comics_document->selected_command =
 250                                         g_find_program_in_path ("unrar");
 251                 if (comics_document->selected_command) {
 252                         /* We only use std_err to avoid printing useless error
 253                          * messages on the terminal */
 254                         success =
 255                                 g_spawn_command_line_sync (
 256                                               comics_document->selected_command,
 257                                                            &std_out, &std_err,
 258                                                            &retval, &err);
 259                         if (!success) {
 260                                 g_propagate_error (error, err);
 261                                 g_error_free (err);
 262                                 return FALSE;
 263                         /* I don't check retval status because RARLAB unrar
 264                          * doesn't have a way to return 0 without involving an
 265                          * operation with a file*/
 266                         } else if (WIFEXITED (retval)) {
 267                                 if (g_strrstr (std_out,"freeware") != NULL)
 268                                         /* The RARLAB freeware client */
 269                                         comics_document->command_usage = RARLABS;
 270                                 else
 271                                         /* The Gna! free software client */
 272                                         comics_document->command_usage = GNAUNRAR;
 273
 274                                 g_free (std_out);
 275                                 g_free (std_err);
 276                                 return TRUE;
 277                         }
 278                 }
 279                 /* The Gna! free software client with Debian naming convention */
 280                 comics_document->selected_command =
 281                                 g_find_program_in_path ("unrar-free");
 282                 if (comics_document->selected_command) {
 283                         comics_document->command_usage = GNAUNRAR;
 284                         return TRUE;
 285                 }
 286
 287         } else if (!strcmp (mime_type, "application/x-cbz") ||
 288                    !strcmp (mime_type, "application/zip")) {
 289                 /* InfoZIP's unzip program */
 290                 comics_document->selected_command =
 291                                 g_find_program_in_path ("unzip");
 292                 if (comics_document->selected_command) {
 293                         comics_document->command_usage = UNZIP;
 294                         return TRUE;
 295                 }
 296
 297         } else if (!strcmp (mime_type, "application/x-cb7") ||
 298                    !strcmp (mime_type, "application/x-7z-compressed")) {
 299                 /* 7zr, 7za and 7z are the commands from the p7zip project able
 300                  * to decompress .7z files */
 301                         comics_document->selected_command =
 302                                 g_find_program_in_path ("7zr");
 303                         if (comics_document->selected_command) {
 304                                 comics_document->command_usage = P7ZIP;
 305                                 return TRUE;
 306                         }
 307                         comics_document->selected_command =
 308                                 g_find_program_in_path ("7za");
 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 ("7z");
 315                         if (comics_document->selected_command) {
 316                                 comics_document->command_usage = P7ZIP;
 317                                 return TRUE;
 318                         }
 319         } else if (!strcmp (mime_type, "application/x-cbt") ||
 320                    !strcmp (mime_type, "application/x-tar")) {
 321                 /* tar utility (Tape ARchive) */
 322                 comics_document->selected_command =
 323                                 g_find_program_in_path ("tar");
 324                 if (comics_document->selected_command) {
 325                         comics_document->command_usage = TAR;
 326                         return TRUE;
 327                 }
 328         } else {
 329                 g_set_error (error,
 330                              EV_DOCUMENT_ERROR,
 331                              EV_DOCUMENT_ERROR_INVALID,
 332                              _("Not a comic book MIME type: %s"),
 333                              mime_type);
 334                              return FALSE;
 335         }
 336         g_set_error_literal (error,
 337                              EV_DOCUMENT_ERROR,
 338                              EV_DOCUMENT_ERROR_INVALID,
 339                              _("Can't find an appropriate command to "
 340                              "decompress this type of comic book"));
 341         return FALSE;
 342 }
 343
 344 static int
 345 sort_page_names (gconstpointer a,
 346                  gconstpointer b)
 347 {
 348   return strcmp (* (const char **) a, * (const char **) b);
 349 }
 350
 351 static gboolean
 352 comics_document_load (EvDocument *document,
 353                       const char *uri,
 354                       GError    **error)
 355 {
 356         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 357         GSList *supported_extensions;
 358         gchar *std_out;
 359         gchar *mime_type;
 360         gchar **cb_files, *cb_file;
 361         gboolean success;
 362         int i, retval;
 363         GError *err = NULL;
 364
 365         comics_document->archive = g_filename_from_uri (uri, NULL, error);
 366         if (!comics_document->archive)
 367                 return FALSE;
 368
 369         mime_type = ev_file_get_mime_type (uri, FALSE, &err);
 370         if (!mime_type) {
 371                 if (err) {
 372                         g_propagate_error (error, err);
 373                 } else {
 374                         g_set_error_literal (error,
 375                                              EV_DOCUMENT_ERROR,
 376                                              EV_DOCUMENT_ERROR_INVALID,
 377                                              _("Unknown MIME Type"));
 378                 }
 379
 380                 return FALSE;
 381         }
 382
 383         if (!comics_check_decompress_command (mime_type, comics_document,
 384         error)) {
 385                 g_free (mime_type);
 386                 return FALSE;
 387         } else if (!comics_generate_command_lines (comics_document, error)) {
 388                    g_free (mime_type);
 389                 return FALSE;
 390         }
 391
 392         g_free (mime_type);
 393
 394         /* Get list of files in archive */
 395         success = g_spawn_command_line_sync (comics_document->list_command,
 396                                              &std_out, NULL, &retval, error);
 397
 398         if (!success) {
 399                 return FALSE;
 400         } else if (!WIFEXITED(retval) || WEXITSTATUS(retval) != EXIT_SUCCESS) {
 401                 g_set_error_literal (error,
 402                                      EV_DOCUMENT_ERROR,
 403                                      EV_DOCUMENT_ERROR_INVALID,
 404                                      _("File corrupted"));
 405                 return FALSE;
 406         }
 407
 408         /* FIXME: is this safe against filenames containing \n in the archive ? */
 409         cb_files = g_strsplit (std_out, "\n", 0);
 410         g_free (std_out);
 411
 412         if (!cb_files) {
 413                 g_set_error_literal (error,
 414                                      EV_DOCUMENT_ERROR,
 415                                      EV_DOCUMENT_ERROR_INVALID,
 416                                      _("No files in archive"));
 417                 return FALSE;
 418         }
 419
 420         comics_document->page_names = g_ptr_array_sized_new (64);
 421
 422         supported_extensions = get_supported_image_extensions ();
 423         for (i = 0; cb_files[i] != NULL; i++) {
 424                 if (comics_document->offset != NO_OFFSET) {
 425                         if (g_utf8_strlen (cb_files[i],-1) >
 426                             comics_document->offset) {
 427                                 cb_file =
 428                                         g_utf8_offset_to_pointer (cb_files[i],
 429                                                        comics_document->offset);
 430                         } else {
 431                                 continue;
 432                         }
 433                 } else {
 434                         cb_file = cb_files[i];
 435                 }
 436                 gchar *suffix = g_strrstr (cb_file, ".");
 437                 if (!suffix)
 438                         continue;
 439                 suffix = g_ascii_strdown (suffix + 1, -1);
 440                 if (g_slist_find_custom (supported_extensions, suffix,
 441                                          (GCompareFunc) strcmp) != NULL) {
 442                         g_ptr_array_add (comics_document->page_names,
 443                                          g_strstrip (g_strdup (cb_file)));
 444                 }
 445                 g_free (suffix);
 446         }
 447         g_strfreev (cb_files);
 448         g_slist_foreach (supported_extensions, (GFunc) g_free, NULL);
 449         g_slist_free (supported_extensions);
 450
 451         if (comics_document->page_names->len == 0) {
 452                 g_set_error (error,
 453                              EV_DOCUMENT_ERROR,
 454                              EV_DOCUMENT_ERROR_INVALID,
 455                              _("No images found in archive %s"),
 456                              uri);
 457                 return FALSE;
 458         }
 459
 460         /* Now sort the pages */
 461         g_ptr_array_sort (comics_document->page_names, sort_page_names);
 462
 463         return TRUE;
 464 }
 465
 466
 467 static gboolean
 468 comics_document_save (EvDocument *document,
 469                       const char *uri,
 470                       GError    **error)
 471 {
 472         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 473
 474         return ev_xfer_uri_simple (comics_document->archive, uri, error);
 475 }
 476
 477 static int
 478 comics_document_get_n_pages (EvDocument *document)
 479 {
 480         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 481
 482         if (comics_document->page_names == NULL)
 483                 return 0;
 484
 485         return comics_document->page_names->len;
 486 }
 487
 488 static void
 489 comics_document_get_page_size (EvDocument *document,
 490                                EvPage     *page,
 491                                double     *width,
 492                                double     *height)
 493 {
 494         GdkPixbufLoader *loader;
 495         char **argv;
 496         guchar buf[1024];
 497         gboolean success, got_size = FALSE;
 498         gint outpipe = -1;
 499         GPid child_pid = -1;
 500         gssize bytes;
 501         GdkPixbuf *pixbuf;
 502         gchar *filename;
 503         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 504
 505         if (!comics_document->decompress_tmp) {
 506                 argv = extract_argv (document, page->index);
 507                 success = g_spawn_async_with_pipes (NULL, argv, NULL,
 508                                                     G_SPAWN_SEARCH_PATH |
 509                                                     G_SPAWN_STDERR_TO_DEV_NULL,
 510                                                     NULL, NULL,
 511                                                     &child_pid,
 512                                                     NULL, &outpipe, NULL, NULL);
 513                 g_strfreev (argv);
 514                 g_return_if_fail (success == TRUE);
 515
 516                 loader = gdk_pixbuf_loader_new ();
 517                 g_signal_connect (loader, "area-prepared",
 518                                   G_CALLBACK (get_page_size_area_prepared_cb),
 519                                   &got_size);
 520
 521                 while (outpipe >= 0) {
 522                         bytes = read (outpipe, buf, 1024);
 523
 524                         if (bytes > 0)
 525                         gdk_pixbuf_loader_write (loader, buf, bytes, NULL);
 526                         if (bytes <= 0 || got_size) {
 527                                 close (outpipe);
 528                                 outpipe = -1;
 529                                 gdk_pixbuf_loader_close (loader, NULL);
 530                         }
 531                 }
 532
 533                 if (gdk_pixbuf_loader_get_pixbuf (loader)) {
 534                         pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
 535                         if (width)
 536                                 *width = gdk_pixbuf_get_width (pixbuf);
 537                         if (height)
 538                                 *height = gdk_pixbuf_get_height (pixbuf);
 539                 }
 540
 541                 g_spawn_close_pid (child_pid);
 542                 g_object_unref (loader);
 543         } else {
 544                 filename = g_build_filename (comics_document->dir,
 545                                              (char *) comics_document->page_names->pdata[page->index],
 546                                              NULL);
 547                 pixbuf = gdk_pixbuf_new_from_file (filename, NULL);
 548                 g_free (filename);
 549                 if (width)
 550                         *width = gdk_pixbuf_get_width (pixbuf);
 551                 if (height)
 552                         *height = gdk_pixbuf_get_height (pixbuf);
 553         }
 554 }
 555
 556 static void
 557 get_page_size_area_prepared_cb (GdkPixbufLoader *loader,
 558                                 gpointer         data)
 559 {
 560         gboolean *got_size = data;
 561         *got_size = TRUE;
 562 }
 563
 564 static GdkPixbuf *
 565 comics_document_render_pixbuf (EvDocument      *document,
 566                                EvRenderContext *rc)
 567 {
 568         GdkPixbufLoader *loader;
 569         GdkPixbuf *rotated_pixbuf;
 570         char **argv;
 571         guchar buf[4096];
 572         gboolean success;
 573         gint outpipe = -1;
 574         GPid child_pid = -1;
 575         gssize bytes;
 576         gint width, height;
 577         gchar *filename;
 578         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 579
 580         if (!comics_document->decompress_tmp) {
 581                 argv = extract_argv (document, rc->page->index);
 582                 success = g_spawn_async_with_pipes (NULL, argv, NULL,
 583                                                     G_SPAWN_SEARCH_PATH |
 584                                                     G_SPAWN_STDERR_TO_DEV_NULL,
 585                                                     NULL, NULL,
 586                                                     &child_pid,
 587                                                     NULL, &outpipe, NULL, NULL);
 588                 g_strfreev (argv);
 589                 g_return_val_if_fail (success == TRUE, NULL);
 590
 591                 loader = gdk_pixbuf_loader_new ();
 592                 g_signal_connect (loader, "size-prepared",
 593                                   G_CALLBACK (render_pixbuf_size_prepared_cb),
 594                                   &rc->scale);
 595
 596                 while (outpipe >= 0) {
 597                         bytes = read (outpipe, buf, 4096);
 598
 599                         if (bytes > 0) {
 600                                 gdk_pixbuf_loader_write (loader, buf, bytes,
 601                                 NULL);
 602                         } else if (bytes <= 0) {
 603                                 close (outpipe);
 604                                 gdk_pixbuf_loader_close (loader, NULL);
 605                                 outpipe = -1;
 606                         }
 607                 }
 608
 609                 rotated_pixbuf = gdk_pixbuf_rotate_simple (
 610                                         gdk_pixbuf_loader_get_pixbuf (loader),
 611                                         360 - rc->rotation);
 612                 g_spawn_close_pid (child_pid);
 613                 g_object_unref (loader);
 614         } else {
 615                 filename =
 616                         g_build_filename (comics_document->dir,
 617                                           (char *) comics_document->page_names->pdata[rc->page->index],
 618                                           NULL);
 619
 620                 gdk_pixbuf_get_file_info (filename, &width, &height);
 621
 622                 rotated_pixbuf =
 623                   gdk_pixbuf_rotate_simple (gdk_pixbuf_new_from_file_at_size (
 624                                             filename, width * (rc->scale) + 0.5,
 625                                             height * (rc->scale) + 0.5, NULL),
 626                                             360 - rc->rotation);
 627                 g_free (filename);
 628
 629         }
 630         return rotated_pixbuf;
 631 }
 632
 633 static cairo_surface_t *
 634 comics_document_render (EvDocument      *document,
 635                         EvRenderContext *rc)
 636 {
 637         GdkPixbuf       *pixbuf;
 638         cairo_surface_t *surface;
 639
 640         pixbuf = comics_document_render_pixbuf (document, rc);
 641         surface = ev_document_misc_surface_from_pixbuf (pixbuf);
 642         g_object_unref (pixbuf);
 643
 644         return surface;
 645 }
 646
 647 static void
 648 render_pixbuf_size_prepared_cb (GdkPixbufLoader *loader,
 649                                 gint             width,
 650                                 gint             height,
 651                                 gpointer         data)
 652 {
 653         double *scale = data;
 654         int w = (width  * (*scale) + 0.5);
 655         int h = (height * (*scale) + 0.5);
 656
 657         gdk_pixbuf_loader_set_size (loader, w, h);
 658 }
 659
 660 /**
 661  * comics_remove_dir: Removes a directory recursively.
 662  * Returns:
 663  *      0 if it was successfully deleted,
 664  *      -1 if an error occurred
 665  */
 666 static int
 667 comics_remove_dir (gchar *path_name)
 668 {
 669         GDir  *content_dir;
 670         const gchar *filename;
 671         gchar *filename_with_path;
 672
 673         if (g_file_test (path_name, G_FILE_TEST_IS_DIR)) {
 674                 content_dir = g_dir_open  (path_name, 0, NULL);
 675                 filename  = g_dir_read_name (content_dir);
 676                 while (filename) {
 677                         filename_with_path =
 678                                 g_build_filename (path_name,
 679                                                   filename, NULL);
 680                         comics_remove_dir (filename_with_path);
 681                         g_free (filename_with_path);
 682                         filename = g_dir_read_name (content_dir);
 683                 }
 684                 g_dir_close (content_dir);
 685         }
 686         /* Note from g_remove() documentation: on Windows, it is in general not
 687          * possible to remove a file that is open to some process, or mapped
 688          * into memory.*/
 689         return (g_remove (path_name));
 690 }
 691
 692 static void
 693 comics_document_finalize (GObject *object)
 694 {
 695         ComicsDocument *comics_document = COMICS_DOCUMENT (object);
 696
 697         if (comics_document->decompress_tmp) {
 698                 if (comics_remove_dir (comics_document->dir) == -1)
 699                         g_warning (_("There was an error deleting “%s”."),
 700                                    comics_document->dir);
 701                 g_free (comics_document->dir);
 702         }
 703
 704         if (comics_document->page_names) {
 705                 g_ptr_array_foreach (comics_document->page_names, (GFunc) g_free, NULL);
 706                 g_ptr_array_free (comics_document->page_names, TRUE);
 707         }
 708
 709         g_free (comics_document->archive);
 710         g_free (comics_document->selected_command);
 711         g_free (comics_document->extract_command);
 712         g_free (comics_document->list_command);
 713
 714         G_OBJECT_CLASS (comics_document_parent_class)->finalize (object);
 715 }
 716
 717 static void
 718 comics_document_class_init (ComicsDocumentClass *klass)
 719 {
 720         GObjectClass    *gobject_class = G_OBJECT_CLASS (klass);
 721         EvDocumentClass *ev_document_class = EV_DOCUMENT_CLASS (klass);
 722
 723         gobject_class->finalize = comics_document_finalize;
 724
 725         ev_document_class->load = comics_document_load;
 726         ev_document_class->save = comics_document_save;
 727         ev_document_class->get_n_pages = comics_document_get_n_pages;
 728         ev_document_class->get_page_size = comics_document_get_page_size;
 729         ev_document_class->render = comics_document_render;
 730 }
 731
 732 static void
 733 comics_document_init (ComicsDocument *comics_document)
 734 {
 735         comics_document->archive = NULL;
 736         comics_document->page_names = NULL;
 737         comics_document->extract_command = NULL;
 738 }
 739
 740 /* Returns a list of file extensions supported by gdk-pixbuf */
 741 static GSList*
 742 get_supported_image_extensions()
 743 {
 744         GSList *extensions = NULL;
 745         GSList *formats = gdk_pixbuf_get_formats ();
 746         GSList *l;
 747
 748         for (l = formats; l != NULL; l = l->next) {
 749                 int i;
 750                 gchar **ext = gdk_pixbuf_format_get_extensions (l->data);
 751
 752                 for (i = 0; ext[i] != NULL; i++) {
 753                         extensions = g_slist_append (extensions,
 754                                                      g_strdup (ext[i]));
 755                 }
 756
 757                 g_strfreev (ext);
 758         }
 759
 760         g_slist_free (formats);
 761         return extensions;
 762 }
 763
 764 static GdkPixbuf *
 765 comics_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document,
 766                                           EvRenderContext      *rc,
 767                                           gboolean              border)
 768 {
 769         GdkPixbuf *thumbnail;
 770
 771         thumbnail = comics_document_render_pixbuf (EV_DOCUMENT (document), rc);
 772
 773         if (border) {
 774               GdkPixbuf *tmp_pixbuf = thumbnail;
 775
 776               thumbnail = ev_document_misc_get_thumbnail_frame (-1, -1, tmp_pixbuf);
 777               g_object_unref (tmp_pixbuf);
 778         }
 779
 780         return thumbnail;
 781 }
 782
 783 static void
 784 comics_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 785                                            EvRenderContext      *rc,
 786                                            gint                 *width,
 787                                            gint                 *height)
 788 {
 789         gdouble page_width, page_height;
 790
 791         comics_document_get_page_size (EV_DOCUMENT (document), rc->page,
 792                                        &page_width, &page_height);
 793
 794         if (rc->rotation == 90 || rc->rotation == 270) {
 795                 *width = (gint) (page_height * rc->scale);
 796                 *height = (gint) (page_width * rc->scale);
 797         } else {
 798                 *width = (gint) (page_width * rc->scale);
 799                 *height = (gint) (page_height * rc->scale);
 800         }
 801 }
 802
 803 static void
 804 comics_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
 805 {
 806         iface->get_thumbnail = comics_document_thumbnails_get_thumbnail;
 807         iface->get_dimensions = comics_document_thumbnails_get_dimensions;
 808 }
 809
 810 static char**
 811 extract_argv (EvDocument *document, gint page)
 812 {
 813         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 814         char **argv;
 815         char *command_line, *quoted_archive, *quoted_filename;
 816         GError *err = NULL;
 817
 818         if (page >= comics_document->page_names->len)
 819                 return NULL;
 820
 821         quoted_archive = g_shell_quote (comics_document->archive);
 822         quoted_filename = g_shell_quote (comics_document->page_names->pdata[page]);
 823
 824         command_line = g_strdup_printf ("%s %s %s",
 825                                         comics_document->extract_command,
 826                                         quoted_archive,
 827                                         quoted_filename);
 828         g_shell_parse_argv (command_line, NULL, &argv, &err);
 829
 830         if (err) {
 831                 g_warning (_("Error %s"), err->message);
 832                 g_error_free (err);
 833                 return NULL;
 834         }
 835
 836         g_free (command_line);
 837         g_free (quoted_archive);
 838         g_free (quoted_filename);
 839         return argv;
 840 }