backend/comics/comics-document.c

   1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; c-indent-level: 8 -*- */
   2 /*
   3  * Copyright (C) 2005, Teemu Tervo <teemu.tervo@gmx.net>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2, or (at your option)
   8  * any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  */
  19
  20 #include "config.h"
  21
  22 #include <config.h>
  23 #include <unistd.h>
  24 #include <string.h>
  25 #include <glib/gi18n-lib.h>
  26 #include <glib/gstdio.h>
  27 #include <gio/gio.h>
  28 #include <sys/wait.h>
  29 #include <stdlib.h>
  30 #include <errno.h>
  31
  32 #include "comics-document.h"
  33 #include "ev-document-misc.h"
  34 #include "ev-document-thumbnails.h"
  35 #include "ev-file-helpers.h"
  36
  37 struct _ComicsDocumentClass
  38 {
  39         EvDocumentClass parent_class;
  40 };
  41
  42 typedef enum
  43 {
  44         RARLABS,
  45         GNAUNRAR,
  46         UNZIP,
  47         P7ZIP
  48 } ComicBookDecompressType;
  49
  50 struct _ComicsDocument
  51 {
  52         EvDocument parent_instance;
  53
  54         gchar    *archive, *dir;
  55         GPtrArray *page_names;
  56         gchar    *selected_command;
  57         gchar    *extract_command, *list_command, *decompress_tmp;
  58         gboolean regex_arg;
  59         gint     offset;
  60         ComicBookDecompressType command_usage;
  61 };
  62
  63 #define OFFSET_7Z 53
  64 #define NO_OFFSET 0
  65
  66 /* For perfomance reasons of 7z* we've choosen to decompress on the temporary
  67  * directory instead of decompressing on the stdout */
  68
  69 struct {
  70         char *extract, *list, *decompress_tmp;
  71         gboolean regex_arg;
  72         gint offset;
  73 } command_usage_def[] = {
  74         {"%s p -c- -ierr", "%s vb -c- -- %s", NULL             , FALSE, NO_OFFSET},
  75         {NULL            , "%s t %s"        , "%s -xf %s %s"   , TRUE , NO_OFFSET},
  76         {"%s -p -C"      , "%s -Z -1 -- %s" , NULL             , TRUE , NO_OFFSET},
  77         {NULL            , "%s l -- %s"     , "%s x -y %s -o%s", FALSE, OFFSET_7Z}
  78 };
  79
  80
  81 typedef struct    _ComicsDocumentClass ComicsDocumentClass;
  82
  83 static void       comics_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface);
  84
  85 static GSList*    get_supported_image_extensions (void);
  86 static void       get_page_size_area_prepared_cb (GdkPixbufLoader *loader,
  87                                                   gpointer data);
  88 static void       render_pixbuf_size_prepared_cb (GdkPixbufLoader *loader,
  89                                                   gint width,
  90                                                   gint height,
  91                                                   gpointer data);
  92 static char**     extract_argv                   (EvDocument *document,
  93                                                   gint page);
  94
  95
  96 EV_BACKEND_REGISTER_WITH_CODE (ComicsDocument, comics_document,
  97         {
  98                 EV_BACKEND_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_THUMBNAILS,
  99                                                 comics_document_document_thumbnails_iface_init);
 100         } );
 101
 102 static char *
 103 comics_regex_quote (const char *s)
 104 {
 105     char *ret, *d;
 106
 107     d = ret = g_malloc (strlen (s) * 4 + 3);
 108
 109     *d++ = '\'';
 110
 111     for (; *s; s++, d++) {
 112         switch (*s) {
 113         case '?':
 114         case '|':
 115         case '[':
 116         case ']':
 117         case '*':
 118         case '\\':
 119             *d++ = '\\';
 120             break;
 121         case '\'':
 122             *d++ = '\'';
 123             *d++ = '\\';
 124             *d++ = '\'';
 125             break;
 126         }
 127         *d = *s;
 128     }
 129
 130     *d++ = '\'';
 131     *d = '\0';
 132
 133     return ret;
 134 }
 135
 136 /* This function manages the command for decompressing a comic book */
 137 static gboolean
 138 comics_decompress_temp_dir (const gchar *command_decompress_tmp,
 139                             const gchar *command,
 140                             GError      **error)
 141 {
 142         gboolean success;
 143         gchar *std_out, *basename;
 144         GError *err = NULL;
 145         gint retval;
 146
 147         success = g_spawn_command_line_sync (command_decompress_tmp, &std_out,
 148                                              NULL, &retval, &err);
 149         basename = g_path_get_basename (command);
 150         if (!success) {
 151                 g_set_error (error,
 152                              EV_DOCUMENT_ERROR,
 153                              EV_DOCUMENT_ERROR_INVALID,
 154                              _("Error launching the command “%s” in order to "
 155                              "decompress the comic book: %s"),
 156                              basename,
 157                              err->message);
 158                 g_error_free (err);
 159         } else if (WIFEXITED (retval)) {
 160                 if (WEXITSTATUS (retval) == EXIT_SUCCESS) {
 161                         g_free (std_out);
 162                         g_free (basename);
 163                         return TRUE;
 164                 } else {
 165                         g_set_error (error,
 166                                      EV_DOCUMENT_ERROR,
 167                                      EV_DOCUMENT_ERROR_INVALID,
 168                                      _("The command “%s” failed at "
 169                                      "decompressing the comic book."),
 170                                      basename);
 171                         g_free (std_out);
 172                 }
 173         } else {
 174                 g_set_error (error,
 175                              EV_DOCUMENT_ERROR,
 176                              EV_DOCUMENT_ERROR_INVALID,
 177                              _("The command “%s” did not end normally."),
 178                              basename);
 179                 g_free (std_out);
 180         }
 181         g_free (basename);
 182         return FALSE;
 183 }
 184
 185 /* This function shows how to use the choosen command for decompressing a
 186  * comic book file. It modifies fields of the ComicsDocument struct with
 187  * this information */
 188 static gboolean
 189 comics_generate_command_lines (ComicsDocument *comics_document,
 190                                GError         **error)
 191 {
 192         gchar *quoted_file;
 193         ComicBookDecompressType type;
 194
 195         type = comics_document->command_usage;
 196         quoted_file = g_shell_quote (comics_document->archive);
 197
 198         comics_document->extract_command =
 199                             g_strdup_printf (command_usage_def[type].extract,
 200                                              comics_document->selected_command);
 201         comics_document->list_command =
 202                             g_strdup_printf (command_usage_def[type].list,
 203                                              comics_document->selected_command,
 204                                              quoted_file);
 205         comics_document->regex_arg = command_usage_def[type].regex_arg;
 206         comics_document->offset = command_usage_def[type].offset;
 207         if (command_usage_def[type].decompress_tmp) {
 208                 comics_document->dir = ev_tmp_directory (NULL);
 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                 /* unrar-free can't create directories so we do it on its
 216                  * behalf */
 217                 if (type == GNAUNRAR) {
 218                         if (g_mkdir_with_parents (comics_document->dir, 0700) !=
 219                             0) {
 220                                 int errsv = errno;
 221                                 g_set_error (error,
 222                                              EV_DOCUMENT_ERROR,
 223                                              EV_DOCUMENT_ERROR_INVALID,
 224                                              _("Failed to create a temporary "
 225                                              "directory."));
 226                                 g_warning ("Failed to create directory %s: %s",
 227                                            comics_document->dir,
 228                                            g_strerror (errsv));
 229
 230                                 return FALSE;
 231                         }
 232                 }
 233                 if (!comics_decompress_temp_dir (comics_document->decompress_tmp,
 234                     comics_document->selected_command, error))
 235                         return FALSE;
 236                 else
 237                         return TRUE;
 238         } else {
 239                 g_free (quoted_file);
 240                 return TRUE;
 241         }
 242
 243 }
 244
 245 /* This function chooses an external command for decompressing a comic
 246  * book based on its mime tipe. */
 247 static gboolean
 248 comics_check_decompress_command (gchar          *mime_type,
 249                                  ComicsDocument *comics_document,
 250                                  GError         **error)
 251 {
 252         gboolean success;
 253         gchar *std_out, *std_err;
 254         gint retval;
 255         GError *err = NULL;
 256
 257         /* FIXME, use proper cbr/cbz mime types once they're
 258          * included in shared-mime-info */
 259
 260         if (!strcmp (mime_type, "application/x-cbr") ||
 261             !strcmp (mime_type, "application/x-rar")) {
 262                 /* The RARLAB provides a no-charge proprietary (freeware)
 263                 * decompress-only client for Linux called unrar. Another
 264                 * option is a GPLv2-licensed command-line tool developed by
 265                 * the Gna! project. Confusingly enough, the free software RAR
 266                 * decoder is also named unrar. For this reason we need to add
 267                 * some lines for disambiguation. Sorry for the added the
 268                 * complexity but it's life :)
 269                 * Finally, some distributions, like Debian, rename this free
 270                 * option as unrar-free.
 271                 * */
 272                 comics_document->selected_command =
 273                                         g_find_program_in_path ("unrar");
 274                 if (comics_document->selected_command) {
 275                         /* We only use std_err to avoid printing useless error
 276                          * messages on the terminal */
 277                         success =
 278                                 g_spawn_command_line_sync (
 279                                               comics_document->selected_command,
 280                                                            &std_out, &std_err,
 281                                                            &retval, &err);
 282                         if (!success) {
 283                                 g_propagate_error (error, err);
 284                                 g_error_free (err);
 285                                 return FALSE;
 286                         /* I don't check retval status because RARLAB unrar
 287                          * doesn't have a way to return 0 without involving an
 288                          * operation with a file*/
 289                         } else if (WIFEXITED (retval)) {
 290                                 if (g_strrstr (std_out,"freeware") != NULL)
 291                                         /* The RARLAB freeware client */
 292                                         comics_document->command_usage = RARLABS;
 293                                 else
 294                                         /* The Gna! free software client */
 295                                         comics_document->command_usage = GNAUNRAR;
 296
 297                                 g_free (std_out);
 298                                 g_free (std_err);
 299                                 return TRUE;
 300                         }
 301                 }
 302                 /* The Gna! free software client with Debian naming convention */
 303                 comics_document->selected_command =
 304                                 g_find_program_in_path ("unrar-free");
 305                 if (comics_document->selected_command) {
 306                         comics_document->command_usage = GNAUNRAR;
 307                         return TRUE;
 308                 }
 309
 310         } else if (!strcmp (mime_type, "application/x-cbz") ||
 311                    !strcmp (mime_type, "application/zip")) {
 312                 /* InfoZIP's unzip program */
 313                 comics_document->selected_command =
 314                                 g_find_program_in_path ("unzip");
 315                 if (comics_document->selected_command) {
 316                         comics_document->command_usage = UNZIP;
 317                         return TRUE;
 318                 }
 319
 320         } else if (!strcmp (mime_type, "application/x-cb7") ||
 321                    !strcmp (mime_type, "application/x-7z-compressed")) {
 322                 /* 7zr, 7za and 7z are the commands from the p7zip project able
 323                  * to decompress .7z files */
 324                         comics_document->selected_command =
 325                                 g_find_program_in_path ("7zr");
 326                         if (comics_document->selected_command) {
 327                                 comics_document->command_usage = P7ZIP;
 328                                 return TRUE;
 329                         }
 330                         comics_document->selected_command =
 331                                 g_find_program_in_path ("7za");
 332                         if (comics_document->selected_command) {
 333                                 comics_document->command_usage = P7ZIP;
 334                                 return TRUE;
 335                         }
 336                         comics_document->selected_command =
 337                                 g_find_program_in_path ("7z");
 338                         if (comics_document->selected_command) {
 339                                 comics_document->command_usage = P7ZIP;
 340                                 return TRUE;
 341                         }
 342         } else {
 343                 g_set_error (error,
 344                              EV_DOCUMENT_ERROR,
 345                              EV_DOCUMENT_ERROR_INVALID,
 346                              _("Not a comic book MIME type: %s"),
 347                              mime_type);
 348                              return FALSE;
 349         }
 350         g_set_error_literal (error,
 351                              EV_DOCUMENT_ERROR,
 352                              EV_DOCUMENT_ERROR_INVALID,
 353                              _("Can't find an appropriate command to "
 354                              "decompress this type of comic book"));
 355         return FALSE;
 356 }
 357
 358 static int
 359 sort_page_names (gconstpointer a,
 360                  gconstpointer b)
 361 {
 362   return strcmp (* (const char **) a, * (const char **) b);
 363 }
 364
 365 static gboolean
 366 comics_document_load (EvDocument *document,
 367                       const char *uri,
 368                       GError    **error)
 369 {
 370         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 371         GSList *supported_extensions;
 372         gchar *std_out;
 373         gchar *mime_type;
 374         gchar **cb_files, *cb_file;
 375         gboolean success;
 376         int i, retval;
 377         GError *err = NULL;
 378
 379         comics_document->archive = g_filename_from_uri (uri, NULL, error);
 380         if (!comics_document->archive)
 381                 return FALSE;
 382
 383         mime_type = ev_file_get_mime_type (uri, FALSE, &err);
 384         if (!mime_type) {
 385                 if (err) {
 386                         g_propagate_error (error, err);
 387                 } else {
 388                         g_set_error_literal (error,
 389                                              EV_DOCUMENT_ERROR,
 390                                              EV_DOCUMENT_ERROR_INVALID,
 391                                              _("Unknown MIME Type"));
 392                 }
 393
 394                 return FALSE;
 395         }
 396
 397         if (!comics_check_decompress_command (mime_type, comics_document,
 398         error)) {
 399                 g_free (mime_type);
 400                 return FALSE;
 401         } else if (!comics_generate_command_lines (comics_document, error)) {
 402                    g_free (mime_type);
 403                 return FALSE;
 404         }
 405
 406         g_free (mime_type);
 407
 408         /* Get list of files in archive */
 409         success = g_spawn_command_line_sync (comics_document->list_command,
 410                                              &std_out, NULL, &retval, error);
 411
 412         if (!success) {
 413                 return FALSE;
 414         } else if (!WIFEXITED(retval) || WEXITSTATUS(retval) != EXIT_SUCCESS) {
 415                 g_set_error_literal (error,
 416                                      EV_DOCUMENT_ERROR,
 417                                      EV_DOCUMENT_ERROR_INVALID,
 418                                      _("File corrupted"));
 419                 return FALSE;
 420         }
 421
 422         /* FIXME: is this safe against filenames containing \n in the archive ? */
 423         cb_files = g_strsplit (std_out, "\n", 0);
 424         g_free (std_out);
 425
 426         if (!cb_files) {
 427                 g_set_error_literal (error,
 428                                      EV_DOCUMENT_ERROR,
 429                                      EV_DOCUMENT_ERROR_INVALID,
 430                                      _("No files in archive"));
 431                 return FALSE;
 432         }
 433
 434         comics_document->page_names = g_ptr_array_sized_new (64);
 435
 436         supported_extensions = get_supported_image_extensions ();
 437         for (i = 0; cb_files[i] != NULL; i++) {
 438                 if (comics_document->offset != NO_OFFSET) {
 439                         if (g_utf8_strlen (cb_files[i],-1) >
 440                             comics_document->offset) {
 441                                 cb_file =
 442                                         g_utf8_offset_to_pointer (cb_files[i],
 443                                                        comics_document->offset);
 444                         } else {
 445                                 continue;
 446                         }
 447                 } else {
 448                         cb_file = cb_files[i];
 449                 }
 450                 gchar *suffix = g_strrstr (cb_file, ".");
 451                 if (!suffix)
 452                         continue;
 453                 suffix = g_ascii_strdown (suffix + 1, -1);
 454                 if (g_slist_find_custom (supported_extensions, suffix,
 455                                          (GCompareFunc) strcmp) != NULL) {
 456                         g_ptr_array_add (comics_document->page_names,
 457                                          g_strstrip (g_strdup (cb_file)));
 458                 }
 459                 g_free (suffix);
 460         }
 461         g_strfreev (cb_files);
 462         g_slist_foreach (supported_extensions, (GFunc) g_free, NULL);
 463         g_slist_free (supported_extensions);
 464
 465         if (comics_document->page_names->len == 0) {
 466                 g_set_error (error,
 467                              EV_DOCUMENT_ERROR,
 468                              EV_DOCUMENT_ERROR_INVALID,
 469                              _("No images found in archive %s"),
 470                              uri);
 471                 return FALSE;
 472         }
 473
 474         /* Now sort the pages */
 475         g_ptr_array_sort (comics_document->page_names, sort_page_names);
 476
 477         return TRUE;
 478 }
 479
 480
 481 static gboolean
 482 comics_document_save (EvDocument *document,
 483                       const char *uri,
 484                       GError    **error)
 485 {
 486         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 487
 488         return ev_xfer_uri_simple (comics_document->archive, uri, error);
 489 }
 490
 491 static int
 492 comics_document_get_n_pages (EvDocument *document)
 493 {
 494         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 495
 496         if (comics_document->page_names == NULL)
 497                 return 0;
 498
 499         return comics_document->page_names->len;
 500 }
 501
 502 static void
 503 comics_document_get_page_size (EvDocument *document,
 504                                EvPage     *page,
 505                                double     *width,
 506                                double     *height)
 507 {
 508         GdkPixbufLoader *loader;
 509         char **argv;
 510         guchar buf[1024];
 511         gboolean success, got_size = FALSE;
 512         gint outpipe = -1;
 513         GPid child_pid = -1;
 514         gssize bytes;
 515         GdkPixbuf *pixbuf;
 516         gchar *filename;
 517         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 518
 519         if (!comics_document->decompress_tmp) {
 520                 argv = extract_argv (document, page->index);
 521                 success = g_spawn_async_with_pipes (NULL, argv, NULL,
 522                                                     G_SPAWN_SEARCH_PATH |
 523                                                     G_SPAWN_STDERR_TO_DEV_NULL,
 524                                                     NULL, NULL,
 525                                                     &child_pid,
 526                                                     NULL, &outpipe, NULL, NULL);
 527                 g_strfreev (argv);
 528                 g_return_if_fail (success == TRUE);
 529
 530                 loader = gdk_pixbuf_loader_new ();
 531                 g_signal_connect (loader, "area-prepared",
 532                                   G_CALLBACK (get_page_size_area_prepared_cb),
 533                                   &got_size);
 534
 535                 while (outpipe >= 0) {
 536                         bytes = read (outpipe, buf, 1024);
 537
 538                         if (bytes > 0)
 539                         gdk_pixbuf_loader_write (loader, buf, bytes, NULL);
 540                         if (bytes <= 0 || got_size) {
 541                                 close (outpipe);
 542                                 outpipe = -1;
 543                                 gdk_pixbuf_loader_close (loader, NULL);
 544                         }
 545                 }
 546
 547                 if (gdk_pixbuf_loader_get_pixbuf (loader)) {
 548                         pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
 549                         if (width)
 550                                 *width = gdk_pixbuf_get_width (pixbuf);
 551                         if (height)
 552                                 *height = gdk_pixbuf_get_height (pixbuf);
 553                 }
 554
 555                 g_spawn_close_pid (child_pid);
 556                 g_object_unref (loader);
 557         } else {
 558                 filename = g_build_filename (comics_document->dir,
 559                                              (char *) comics_document->page_names->pdata[page->index],
 560                                              NULL);
 561                 pixbuf = gdk_pixbuf_new_from_file (filename, NULL);
 562                 g_free (filename);
 563                 if (width)
 564                         *width = gdk_pixbuf_get_width (pixbuf);
 565                 if (height)
 566                         *height = gdk_pixbuf_get_height (pixbuf);
 567         }
 568 }
 569
 570 static void
 571 get_page_size_area_prepared_cb (GdkPixbufLoader *loader,
 572                                 gpointer         data)
 573 {
 574         gboolean *got_size = data;
 575         *got_size = TRUE;
 576 }
 577
 578 static GdkPixbuf *
 579 comics_document_render_pixbuf (EvDocument      *document,
 580                                EvRenderContext *rc)
 581 {
 582         GdkPixbufLoader *loader;
 583         GdkPixbuf *rotated_pixbuf;
 584         char **argv;
 585         guchar buf[4096];
 586         gboolean success;
 587         gint outpipe = -1;
 588         GPid child_pid = -1;
 589         gssize bytes;
 590         gint width, height;
 591         gchar *filename;
 592         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 593
 594         if (!comics_document->decompress_tmp) {
 595                 argv = extract_argv (document, rc->page->index);
 596                 success = g_spawn_async_with_pipes (NULL, argv, NULL,
 597                                                     G_SPAWN_SEARCH_PATH |
 598                                                     G_SPAWN_STDERR_TO_DEV_NULL,
 599                                                     NULL, NULL,
 600                                                     &child_pid,
 601                                                     NULL, &outpipe, NULL, NULL);
 602                 g_strfreev (argv);
 603                 g_return_val_if_fail (success == TRUE, NULL);
 604
 605                 loader = gdk_pixbuf_loader_new ();
 606                 g_signal_connect (loader, "size-prepared",
 607                                   G_CALLBACK (render_pixbuf_size_prepared_cb),
 608                                   &rc->scale);
 609
 610                 while (outpipe >= 0) {
 611                         bytes = read (outpipe, buf, 4096);
 612
 613                         if (bytes > 0) {
 614                                 gdk_pixbuf_loader_write (loader, buf, bytes,
 615                                 NULL);
 616                         } else if (bytes <= 0) {
 617                                 close (outpipe);
 618                                 gdk_pixbuf_loader_close (loader, NULL);
 619                                 outpipe = -1;
 620                         }
 621                 }
 622
 623                 rotated_pixbuf = gdk_pixbuf_rotate_simple (
 624                                         gdk_pixbuf_loader_get_pixbuf (loader),
 625                                         360 - rc->rotation);
 626                 g_spawn_close_pid (child_pid);
 627                 g_object_unref (loader);
 628         } else {
 629                 filename =
 630                         g_build_filename (comics_document->dir,
 631                                           (char *) comics_document->page_names->pdata[rc->page->index],
 632                                           NULL);
 633
 634                 gdk_pixbuf_get_file_info (filename, &width, &height);
 635
 636                 rotated_pixbuf =
 637                   gdk_pixbuf_rotate_simple (gdk_pixbuf_new_from_file_at_size (
 638                                             filename, width * (rc->scale) + 0.5,
 639                                             height * (rc->scale) + 0.5, NULL),
 640                                             360 - rc->rotation);
 641                 g_free (filename);
 642
 643         }
 644         return rotated_pixbuf;
 645 }
 646
 647 static cairo_surface_t *
 648 comics_document_render (EvDocument      *document,
 649                         EvRenderContext *rc)
 650 {
 651         GdkPixbuf       *pixbuf;
 652         cairo_surface_t *surface;
 653
 654         pixbuf = comics_document_render_pixbuf (document, rc);
 655         surface = ev_document_misc_surface_from_pixbuf (pixbuf);
 656         g_object_unref (pixbuf);
 657
 658         return surface;
 659 }
 660
 661 static void
 662 render_pixbuf_size_prepared_cb (GdkPixbufLoader *loader,
 663                                 gint             width,
 664                                 gint             height,
 665                                 gpointer         data)
 666 {
 667         double *scale = data;
 668         int w = (width  * (*scale) + 0.5);
 669         int h = (height * (*scale) + 0.5);
 670
 671         gdk_pixbuf_loader_set_size (loader, w, h);
 672 }
 673
 674 /**
 675  * comics_remove_dir: Removes a directory recursively.
 676  * Returns:
 677  *      0 if it was successfully deleted,
 678  *      -1 if an error occurred
 679  */
 680 static int
 681 comics_remove_dir (gchar *path_name)
 682 {
 683         GDir  *content_dir;
 684         const gchar *filename;
 685         gchar *filename_with_path;
 686
 687         if (g_file_test (path_name, G_FILE_TEST_IS_DIR)) {
 688                 content_dir = g_dir_open  (path_name, 0, NULL);
 689                 filename  = g_dir_read_name (content_dir);
 690                 while (filename) {
 691                         filename_with_path =
 692                                 g_build_filename (path_name,
 693                                                   filename, NULL);
 694                         comics_remove_dir (filename_with_path);
 695                         g_free (filename_with_path);
 696                         filename = g_dir_read_name (content_dir);
 697                 }
 698                 g_dir_close (content_dir);
 699         }
 700         /* Note from g_remove() documentation: on Windows, it is in general not
 701          * possible to remove a file that is open to some process, or mapped
 702          * into memory.*/
 703         return (g_remove (path_name));
 704 }
 705
 706 static void
 707 comics_document_finalize (GObject *object)
 708 {
 709         ComicsDocument *comics_document = COMICS_DOCUMENT (object);
 710
 711         if (comics_document->decompress_tmp) {
 712                 if (comics_remove_dir (comics_document->dir) == -1)
 713                         g_warning (_("There was an error deleting “%s”."),
 714                                    comics_document->dir);
 715                 g_free (comics_document->dir);
 716                 g_remove (ev_tmp_dir ());
 717         }
 718
 719         if (comics_document->page_names) {
 720                 g_ptr_array_foreach (comics_document->page_names, (GFunc) g_free, NULL);
 721                 g_ptr_array_free (comics_document->page_names, TRUE);
 722         }
 723
 724         g_free (comics_document->archive);
 725         g_free (comics_document->selected_command);
 726         g_free (comics_document->extract_command);
 727         g_free (comics_document->list_command);
 728
 729         G_OBJECT_CLASS (comics_document_parent_class)->finalize (object);
 730 }
 731
 732 static void
 733 comics_document_class_init (ComicsDocumentClass *klass)
 734 {
 735         GObjectClass    *gobject_class = G_OBJECT_CLASS (klass);
 736         EvDocumentClass *ev_document_class = EV_DOCUMENT_CLASS (klass);
 737
 738         gobject_class->finalize = comics_document_finalize;
 739
 740         ev_document_class->load = comics_document_load;
 741         ev_document_class->save = comics_document_save;
 742         ev_document_class->get_n_pages = comics_document_get_n_pages;
 743         ev_document_class->get_page_size = comics_document_get_page_size;
 744         ev_document_class->render = comics_document_render;
 745 }
 746
 747 static void
 748 comics_document_init (ComicsDocument *comics_document)
 749 {
 750         comics_document->archive = NULL;
 751         comics_document->page_names = NULL;
 752         comics_document->extract_command = NULL;
 753 }
 754
 755 /* Returns a list of file extensions supported by gdk-pixbuf */
 756 static GSList*
 757 get_supported_image_extensions()
 758 {
 759         GSList *extensions = NULL;
 760         GSList *formats = gdk_pixbuf_get_formats ();
 761         GSList *l;
 762
 763         for (l = formats; l != NULL; l = l->next) {
 764                 int i;
 765                 gchar **ext = gdk_pixbuf_format_get_extensions (l->data);
 766
 767                 for (i = 0; ext[i] != NULL; i++) {
 768                         extensions = g_slist_append (extensions,
 769                                                      g_strdup (ext[i]));
 770                 }
 771
 772                 g_strfreev (ext);
 773         }
 774
 775         g_slist_free (formats);
 776         return extensions;
 777 }
 778
 779 static GdkPixbuf *
 780 comics_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document,
 781                                           EvRenderContext      *rc,
 782                                           gboolean              border)
 783 {
 784         GdkPixbuf *thumbnail;
 785
 786         thumbnail = comics_document_render_pixbuf (EV_DOCUMENT (document), rc);
 787
 788         if (border) {
 789               GdkPixbuf *tmp_pixbuf = thumbnail;
 790
 791               thumbnail = ev_document_misc_get_thumbnail_frame (-1, -1, tmp_pixbuf);
 792               g_object_unref (tmp_pixbuf);
 793         }
 794
 795         return thumbnail;
 796 }
 797
 798 static void
 799 comics_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 800                                            EvRenderContext      *rc,
 801                                            gint                 *width,
 802                                            gint                 *height)
 803 {
 804         gdouble page_width, page_height;
 805
 806         comics_document_get_page_size (EV_DOCUMENT (document), rc->page,
 807                                        &page_width, &page_height);
 808
 809         if (rc->rotation == 90 || rc->rotation == 270) {
 810                 *width = (gint) (page_height * rc->scale);
 811                 *height = (gint) (page_width * rc->scale);
 812         } else {
 813                 *width = (gint) (page_width * rc->scale);
 814                 *height = (gint) (page_height * rc->scale);
 815         }
 816 }
 817
 818 static void
 819 comics_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
 820 {
 821         iface->get_thumbnail = comics_document_thumbnails_get_thumbnail;
 822         iface->get_dimensions = comics_document_thumbnails_get_dimensions;
 823 }
 824
 825 static char**
 826 extract_argv (EvDocument *document, gint page)
 827 {
 828         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 829         char **argv;
 830         char *command_line, *quoted_archive, *quoted_filename;
 831         GError *err = NULL;
 832
 833         if (page >= comics_document->page_names->len)
 834                 return NULL;
 835
 836         quoted_archive = g_shell_quote (comics_document->archive);
 837         if (comics_document->regex_arg) {
 838                 quoted_filename = comics_regex_quote (comics_document->page_names->pdata[page]);
 839         } else {
 840                 quoted_filename = g_shell_quote (comics_document->page_names->pdata[page]);
 841         }
 842
 843         command_line = g_strdup_printf ("%s -- %s %s",
 844                                         comics_document->extract_command,
 845                                         quoted_archive,
 846                                         quoted_filename);
 847
 848         g_shell_parse_argv (command_line, NULL, &argv, &err);
 849
 850         if (err) {
 851                 g_warning (_("Error %s"), err->message);
 852                 g_error_free (err);
 853                 return NULL;
 854         }
 855
 856         g_free (command_line);
 857         g_free (quoted_archive);
 858         g_free (quoted_filename);
 859         return argv;
 860 }