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 <unistd.h>
  23 #include <string.h>
  24 #include <sys/wait.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 #include "comics-document.h"
  34 #include "ev-document-misc.h"
  35 #include "ev-document-thumbnails.h"
  36 #include "ev-file-helpers.h"
  37
  38 typedef enum
  39 {
  40         RARLABS,
  41         GNAUNRAR,
  42         UNZIP,
  43         P7ZIP
  44 } ComicBookDecompressType;
  45
  46 typedef struct _ComicsDocumentClass ComicsDocumentClass;
  47
  48 struct _ComicsDocumentClass
  49 {
  50         EvDocumentClass parent_class;
  51 };
  52
  53 struct _ComicsDocument
  54 {
  55         EvDocument parent_instance;
  56
  57         gchar    *archive, *dir;
  58         GPtrArray *page_names;
  59         gchar    *selected_command;
  60         gchar    *extract_command, *list_command, *decompress_tmp;
  61         gboolean regex_arg;
  62         gint     offset;
  63         ComicBookDecompressType command_usage;
  64 };
  65
  66 #define OFFSET_7Z 53
  67 #define NO_OFFSET 0
  68
  69 /* For perfomance reasons of 7z* we've choosen to decompress on the temporary
  70  * directory instead of decompressing on the stdout */
  71
  72 /**
  73  * @extract: command line arguments to pass to extract a file from the archive
  74  *   to stdout. The archive file and the file to extract will be appended after
  75  *   a "--".
  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. The archive file and the directory to extract to will be
  79  *   appended after a "--".
  80  * @regex_arg: whether the command expects one filename or accepts a regex (glob?)
  81  * @offset: the byte offset of the filename on each line in the output of
  82  *   running the @list command
  83  */
  84 typedef struct {
  85         char *extract;
  86         char *list;
  87         char *decompress_tmp;
  88         gboolean regex_arg;
  89         gint offset;
  90 } ComicBookDecompressCommand;
  91
  92 static const ComicBookDecompressCommand command_usage_def[] = {
  93         /* RARLABS unrar */
  94         {"%s p -c- -ierr", "%s vb -c- -- %s", NULL             , FALSE, NO_OFFSET},
  95
  96         /* GNA! unrar */
  97         {NULL            , "%s t %s"        , "%s -xf %s %s"   , TRUE , NO_OFFSET},
  98
  99         /* unzip */
 100         {"%s -p -C"      , "%s -Z -1 -- %s" , NULL             , TRUE , NO_OFFSET},
 101
 102         /* 7zip */
 103         {NULL            , "%s l -- %s"     , "%s x -y %s -o%s", FALSE, OFFSET_7Z}
 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 static char *
 126 comics_regex_quote (const char *s)
 127 {
 128     char *ret, *d;
 129
 130     d = ret = g_malloc (strlen (s) * 4 + 3);
 131
 132     *d++ = '\'';
 133
 134     for (; *s; s++, d++) {
 135         switch (*s) {
 136         case '?':
 137         case '|':
 138         case '[':
 139         case ']':
 140         case '*':
 141         case '\\':
 142             *d++ = '\\';
 143             break;
 144         case '\'':
 145             *d++ = '\'';
 146             *d++ = '\\';
 147             *d++ = '\'';
 148             break;
 149         }
 150         *d = *s;
 151     }
 152
 153     *d++ = '\'';
 154     *d = '\0';
 155
 156     return ret;
 157 }
 158
 159 /* This function manages the command for decompressing a comic book */
 160 static gboolean
 161 comics_decompress_temp_dir (const gchar *command_decompress_tmp,
 162                             const gchar *command,
 163                             GError      **error)
 164 {
 165         gboolean success;
 166         gchar *std_out, *basename;
 167         GError *err = NULL;
 168         gint retval;
 169
 170         success = g_spawn_command_line_sync (command_decompress_tmp, &std_out,
 171                                              NULL, &retval, &err);
 172         basename = g_path_get_basename (command);
 173         if (!success) {
 174                 g_set_error (error,
 175                              EV_DOCUMENT_ERROR,
 176                              EV_DOCUMENT_ERROR_INVALID,
 177                              _("Error launching the command “%s” in order to "
 178                              "decompress the comic book: %s"),
 179                              basename,
 180                              err->message);
 181                 g_error_free (err);
 182         } else if (WIFEXITED (retval)) {
 183                 if (WEXITSTATUS (retval) == EXIT_SUCCESS) {
 184                         g_free (std_out);
 185                         g_free (basename);
 186                         return TRUE;
 187                 } else {
 188                         g_set_error (error,
 189                                      EV_DOCUMENT_ERROR,
 190                                      EV_DOCUMENT_ERROR_INVALID,
 191                                      _("The command “%s” failed at "
 192                                      "decompressing the comic book."),
 193                                      basename);
 194                         g_free (std_out);
 195                 }
 196         } else {
 197                 g_set_error (error,
 198                              EV_DOCUMENT_ERROR,
 199                              EV_DOCUMENT_ERROR_INVALID,
 200                              _("The command “%s” did not end normally."),
 201                              basename);
 202                 g_free (std_out);
 203         }
 204         g_free (basename);
 205         return FALSE;
 206 }
 207
 208 /* This function shows how to use the choosen command for decompressing a
 209  * comic book file. It modifies fields of the ComicsDocument struct with
 210  * this information */
 211 static gboolean
 212 comics_generate_command_lines (ComicsDocument *comics_document,
 213                                GError         **error)
 214 {
 215         gchar *quoted_file;
 216         ComicBookDecompressType type;
 217
 218         type = comics_document->command_usage;
 219         quoted_file = g_shell_quote (comics_document->archive);
 220
 221         comics_document->extract_command =
 222                             g_strdup_printf (command_usage_def[type].extract,
 223                                              comics_document->selected_command);
 224         comics_document->list_command =
 225                             g_strdup_printf (command_usage_def[type].list,
 226                                              comics_document->selected_command,
 227                                              quoted_file);
 228         comics_document->regex_arg = command_usage_def[type].regex_arg;
 229         comics_document->offset = command_usage_def[type].offset;
 230         if (command_usage_def[type].decompress_tmp) {
 231                 comics_document->dir = ev_mkdtemp ("evince-comics-XXXXXX", error);
 232                 if (comics_document->dir == NULL)
 233                         return FALSE;
 234
 235                 /* unrar-free can't create directories, but ev_mkdtemp already created the dir */
 236
 237                 comics_document->decompress_tmp =
 238                         g_strdup_printf (command_usage_def[type].decompress_tmp,
 239                                          comics_document->selected_command,
 240                                          quoted_file,
 241                                          comics_document->dir);
 242                 g_free (quoted_file);
 243
 244                 if (!comics_decompress_temp_dir (comics_document->decompress_tmp,
 245                     comics_document->selected_command, error))
 246                         return FALSE;
 247                 else
 248                         return TRUE;
 249         } else {
 250                 g_free (quoted_file);
 251                 return TRUE;
 252         }
 253
 254 }
 255
 256 /* This function chooses an external command for decompressing a comic
 257  * book based on its mime tipe. */
 258 static gboolean
 259 comics_check_decompress_command (gchar          *mime_type,
 260                                  ComicsDocument *comics_document,
 261                                  GError         **error)
 262 {
 263         gboolean success;
 264         gchar *std_out, *std_err;
 265         gint retval;
 266         GError *err = NULL;
 267
 268         /* FIXME, use proper cbr/cbz mime types once they're
 269          * included in shared-mime-info */
 270
 271         if (!strcmp (mime_type, "application/x-cbr") ||
 272             !strcmp (mime_type, "application/x-rar")) {
 273                 /* The RARLAB provides a no-charge proprietary (freeware)
 274                 * decompress-only client for Linux called unrar. Another
 275                 * option is a GPLv2-licensed command-line tool developed by
 276                 * the Gna! project. Confusingly enough, the free software RAR
 277                 * decoder is also named unrar. For this reason we need to add
 278                 * some lines for disambiguation. Sorry for the added the
 279                 * complexity but it's life :)
 280                 * Finally, some distributions, like Debian, rename this free
 281                 * option as unrar-free.
 282                 * */
 283                 comics_document->selected_command =
 284                                         g_find_program_in_path ("unrar");
 285                 if (comics_document->selected_command) {
 286                         /* We only use std_err to avoid printing useless error
 287                          * messages on the terminal */
 288                         success =
 289                                 g_spawn_command_line_sync (
 290                                               comics_document->selected_command,
 291                                                            &std_out, &std_err,
 292                                                            &retval, &err);
 293                         if (!success) {
 294                                 g_propagate_error (error, err);
 295                                 g_error_free (err);
 296                                 return FALSE;
 297                         /* I don't check retval status because RARLAB unrar
 298                          * doesn't have a way to return 0 without involving an
 299                          * operation with a file*/
 300                         } else if (WIFEXITED (retval)) {
 301                                 if (g_strrstr (std_out,"freeware") != NULL)
 302                                         /* The RARLAB freeware client */
 303                                         comics_document->command_usage = RARLABS;
 304                                 else
 305                                         /* The Gna! free software client */
 306                                         comics_document->command_usage = GNAUNRAR;
 307
 308                                 g_free (std_out);
 309                                 g_free (std_err);
 310                                 return TRUE;
 311                         }
 312                 }
 313                 /* The Gna! free software client with Debian naming convention */
 314                 comics_document->selected_command =
 315                                 g_find_program_in_path ("unrar-free");
 316                 if (comics_document->selected_command) {
 317                         comics_document->command_usage = GNAUNRAR;
 318                         return TRUE;
 319                 }
 320
 321         } else if (!strcmp (mime_type, "application/x-cbz") ||
 322                    !strcmp (mime_type, "application/zip")) {
 323                 /* InfoZIP's unzip program */
 324                 comics_document->selected_command =
 325                                 g_find_program_in_path ("unzip");
 326                 if (comics_document->selected_command) {
 327                         comics_document->command_usage = UNZIP;
 328                         return TRUE;
 329                 }
 330
 331         } else if (!strcmp (mime_type, "application/x-cb7") ||
 332                    !strcmp (mime_type, "application/x-7z-compressed")) {
 333                 /* 7zr, 7za and 7z are the commands from the p7zip project able
 334                  * to decompress .7z files */
 335                         comics_document->selected_command =
 336                                 g_find_program_in_path ("7zr");
 337                         if (comics_document->selected_command) {
 338                                 comics_document->command_usage = P7ZIP;
 339                                 return TRUE;
 340                         }
 341                         comics_document->selected_command =
 342                                 g_find_program_in_path ("7za");
 343                         if (comics_document->selected_command) {
 344                                 comics_document->command_usage = P7ZIP;
 345                                 return TRUE;
 346                         }
 347                         comics_document->selected_command =
 348                                 g_find_program_in_path ("7z");
 349                         if (comics_document->selected_command) {
 350                                 comics_document->command_usage = P7ZIP;
 351                                 return TRUE;
 352                         }
 353         } else {
 354                 g_set_error (error,
 355                              EV_DOCUMENT_ERROR,
 356                              EV_DOCUMENT_ERROR_INVALID,
 357                              _("Not a comic book MIME type: %s"),
 358                              mime_type);
 359                              return FALSE;
 360         }
 361         g_set_error_literal (error,
 362                              EV_DOCUMENT_ERROR,
 363                              EV_DOCUMENT_ERROR_INVALID,
 364                              _("Can't find an appropriate command to "
 365                              "decompress this type of comic book"));
 366         return FALSE;
 367 }
 368
 369 static int
 370 sort_page_names (gconstpointer a,
 371                  gconstpointer b)
 372 {
 373   return strcmp (* (const char **) a, * (const char **) b);
 374 }
 375
 376 static gboolean
 377 comics_document_load (EvDocument *document,
 378                       const char *uri,
 379                       GError    **error)
 380 {
 381         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 382         GSList *supported_extensions;
 383         gchar *std_out;
 384         gchar *mime_type;
 385         gchar **cb_files, *cb_file;
 386         gboolean success;
 387         int i, retval;
 388         GError *err = NULL;
 389
 390         comics_document->archive = g_filename_from_uri (uri, NULL, error);
 391         if (!comics_document->archive)
 392                 return FALSE;
 393
 394         mime_type = ev_file_get_mime_type (uri, FALSE, &err);
 395         if (!mime_type) {
 396                 if (err) {
 397                         g_propagate_error (error, err);
 398                 } else {
 399                         g_set_error_literal (error,
 400                                              EV_DOCUMENT_ERROR,
 401                                              EV_DOCUMENT_ERROR_INVALID,
 402                                              _("Unknown MIME Type"));
 403                 }
 404
 405                 return FALSE;
 406         }
 407
 408         if (!comics_check_decompress_command (mime_type, comics_document,
 409         error)) {
 410                 g_free (mime_type);
 411                 return FALSE;
 412         } else if (!comics_generate_command_lines (comics_document, error)) {
 413                    g_free (mime_type);
 414                 return FALSE;
 415         }
 416
 417         g_free (mime_type);
 418
 419         /* Get list of files in archive */
 420         success = g_spawn_command_line_sync (comics_document->list_command,
 421                                              &std_out, NULL, &retval, error);
 422
 423         if (!success) {
 424                 return FALSE;
 425         } else if (!WIFEXITED(retval) || WEXITSTATUS(retval) != EXIT_SUCCESS) {
 426                 g_set_error_literal (error,
 427                                      EV_DOCUMENT_ERROR,
 428                                      EV_DOCUMENT_ERROR_INVALID,
 429                                      _("File corrupted"));
 430                 return FALSE;
 431         }
 432
 433         /* FIXME: is this safe against filenames containing \n in the archive ? */
 434         cb_files = g_strsplit (std_out, "\n", 0);
 435         g_free (std_out);
 436
 437         if (!cb_files) {
 438                 g_set_error_literal (error,
 439                                      EV_DOCUMENT_ERROR,
 440                                      EV_DOCUMENT_ERROR_INVALID,
 441                                      _("No files in archive"));
 442                 return FALSE;
 443         }
 444
 445         comics_document->page_names = g_ptr_array_sized_new (64);
 446
 447         supported_extensions = get_supported_image_extensions ();
 448         for (i = 0; cb_files[i] != NULL; i++) {
 449                 if (comics_document->offset != NO_OFFSET) {
 450                         if (g_utf8_strlen (cb_files[i],-1) >
 451                             comics_document->offset) {
 452                                 cb_file =
 453                                         g_utf8_offset_to_pointer (cb_files[i],
 454                                                        comics_document->offset);
 455                         } else {
 456                                 continue;
 457                         }
 458                 } else {
 459                         cb_file = cb_files[i];
 460                 }
 461                 gchar *suffix = g_strrstr (cb_file, ".");
 462                 if (!suffix)
 463                         continue;
 464                 suffix = g_ascii_strdown (suffix + 1, -1);
 465                 if (g_slist_find_custom (supported_extensions, suffix,
 466                                          (GCompareFunc) strcmp) != NULL) {
 467                         g_ptr_array_add (comics_document->page_names,
 468                                          g_strstrip (g_strdup (cb_file)));
 469                 }
 470                 g_free (suffix);
 471         }
 472         g_strfreev (cb_files);
 473         g_slist_foreach (supported_extensions, (GFunc) g_free, NULL);
 474         g_slist_free (supported_extensions);
 475
 476         if (comics_document->page_names->len == 0) {
 477                 g_set_error (error,
 478                              EV_DOCUMENT_ERROR,
 479                              EV_DOCUMENT_ERROR_INVALID,
 480                              _("No images found in archive %s"),
 481                              uri);
 482                 return FALSE;
 483         }
 484
 485         /* Now sort the pages */
 486         g_ptr_array_sort (comics_document->page_names, sort_page_names);
 487
 488         return TRUE;
 489 }
 490
 491
 492 static gboolean
 493 comics_document_save (EvDocument *document,
 494                       const char *uri,
 495                       GError    **error)
 496 {
 497         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 498
 499         return ev_xfer_uri_simple (comics_document->archive, uri, error);
 500 }
 501
 502 static int
 503 comics_document_get_n_pages (EvDocument *document)
 504 {
 505         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 506
 507         if (comics_document->page_names == NULL)
 508                 return 0;
 509
 510         return comics_document->page_names->len;
 511 }
 512
 513 static void
 514 comics_document_get_page_size (EvDocument *document,
 515                                EvPage     *page,
 516                                double     *width,
 517                                double     *height)
 518 {
 519         GdkPixbufLoader *loader;
 520         char **argv;
 521         guchar buf[1024];
 522         gboolean success, got_size = FALSE;
 523         gint outpipe = -1;
 524         GPid child_pid = -1;
 525         gssize bytes;
 526         GdkPixbuf *pixbuf;
 527         gchar *filename;
 528         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 529
 530         if (!comics_document->decompress_tmp) {
 531                 argv = extract_argv (document, page->index);
 532                 success = g_spawn_async_with_pipes (NULL, argv, NULL,
 533                                                     G_SPAWN_SEARCH_PATH |
 534                                                     G_SPAWN_STDERR_TO_DEV_NULL,
 535                                                     NULL, NULL,
 536                                                     &child_pid,
 537                                                     NULL, &outpipe, NULL, NULL);
 538                 g_strfreev (argv);
 539                 g_return_if_fail (success == TRUE);
 540
 541                 loader = gdk_pixbuf_loader_new ();
 542                 g_signal_connect (loader, "area-prepared",
 543                                   G_CALLBACK (get_page_size_area_prepared_cb),
 544                                   &got_size);
 545
 546                 while (outpipe >= 0) {
 547                         bytes = read (outpipe, buf, 1024);
 548
 549                         if (bytes > 0)
 550                         gdk_pixbuf_loader_write (loader, buf, bytes, NULL);
 551                         if (bytes <= 0 || got_size) {
 552                                 close (outpipe);
 553                                 outpipe = -1;
 554                                 gdk_pixbuf_loader_close (loader, NULL);
 555                         }
 556                 }
 557
 558                 if (gdk_pixbuf_loader_get_pixbuf (loader)) {
 559                         pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
 560                         if (width)
 561                                 *width = gdk_pixbuf_get_width (pixbuf);
 562                         if (height)
 563                                 *height = gdk_pixbuf_get_height (pixbuf);
 564                 }
 565
 566                 g_spawn_close_pid (child_pid);
 567                 g_object_unref (loader);
 568         } else {
 569                 filename = g_build_filename (comics_document->dir,
 570                                              (char *) comics_document->page_names->pdata[page->index],
 571                                              NULL);
 572                 pixbuf = gdk_pixbuf_new_from_file (filename, NULL);
 573                 g_free (filename);
 574                 if (width)
 575                         *width = gdk_pixbuf_get_width (pixbuf);
 576                 if (height)
 577                         *height = gdk_pixbuf_get_height (pixbuf);
 578         }
 579 }
 580
 581 static void
 582 get_page_size_area_prepared_cb (GdkPixbufLoader *loader,
 583                                 gpointer         data)
 584 {
 585         gboolean *got_size = data;
 586         *got_size = TRUE;
 587 }
 588
 589 static GdkPixbuf *
 590 comics_document_render_pixbuf (EvDocument      *document,
 591                                EvRenderContext *rc)
 592 {
 593         GdkPixbufLoader *loader;
 594         GdkPixbuf *rotated_pixbuf;
 595         char **argv;
 596         guchar buf[4096];
 597         gboolean success;
 598         gint outpipe = -1;
 599         GPid child_pid = -1;
 600         gssize bytes;
 601         gint width, height;
 602         gchar *filename;
 603         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 604
 605         if (!comics_document->decompress_tmp) {
 606                 argv = extract_argv (document, rc->page->index);
 607                 success = g_spawn_async_with_pipes (NULL, argv, NULL,
 608                                                     G_SPAWN_SEARCH_PATH |
 609                                                     G_SPAWN_STDERR_TO_DEV_NULL,
 610                                                     NULL, NULL,
 611                                                     &child_pid,
 612                                                     NULL, &outpipe, NULL, NULL);
 613                 g_strfreev (argv);
 614                 g_return_val_if_fail (success == TRUE, NULL);
 615
 616                 loader = gdk_pixbuf_loader_new ();
 617                 g_signal_connect (loader, "size-prepared",
 618                                   G_CALLBACK (render_pixbuf_size_prepared_cb),
 619                                   &rc->scale);
 620
 621                 while (outpipe >= 0) {
 622                         bytes = read (outpipe, buf, 4096);
 623
 624                         if (bytes > 0) {
 625                                 gdk_pixbuf_loader_write (loader, buf, bytes,
 626                                 NULL);
 627                         } else if (bytes <= 0) {
 628                                 close (outpipe);
 629                                 gdk_pixbuf_loader_close (loader, NULL);
 630                                 outpipe = -1;
 631                         }
 632                 }
 633
 634                 rotated_pixbuf = gdk_pixbuf_rotate_simple (
 635                                         gdk_pixbuf_loader_get_pixbuf (loader),
 636                                         360 - rc->rotation);
 637                 g_spawn_close_pid (child_pid);
 638                 g_object_unref (loader);
 639         } else {
 640                 filename =
 641                         g_build_filename (comics_document->dir,
 642                                           (char *) comics_document->page_names->pdata[rc->page->index],
 643                                           NULL);
 644
 645                 gdk_pixbuf_get_file_info (filename, &width, &height);
 646
 647                 rotated_pixbuf =
 648                   gdk_pixbuf_rotate_simple (gdk_pixbuf_new_from_file_at_size (
 649                                             filename, width * (rc->scale) + 0.5,
 650                                             height * (rc->scale) + 0.5, NULL),
 651                                             360 - rc->rotation);
 652                 g_free (filename);
 653
 654         }
 655         return rotated_pixbuf;
 656 }
 657
 658 static cairo_surface_t *
 659 comics_document_render (EvDocument      *document,
 660                         EvRenderContext *rc)
 661 {
 662         GdkPixbuf       *pixbuf;
 663         cairo_surface_t *surface;
 664
 665         pixbuf = comics_document_render_pixbuf (document, rc);
 666         surface = ev_document_misc_surface_from_pixbuf (pixbuf);
 667         g_object_unref (pixbuf);
 668
 669         return surface;
 670 }
 671
 672 static void
 673 render_pixbuf_size_prepared_cb (GdkPixbufLoader *loader,
 674                                 gint             width,
 675                                 gint             height,
 676                                 gpointer         data)
 677 {
 678         double *scale = data;
 679         int w = (width  * (*scale) + 0.5);
 680         int h = (height * (*scale) + 0.5);
 681
 682         gdk_pixbuf_loader_set_size (loader, w, h);
 683 }
 684
 685 /**
 686  * comics_remove_dir: Removes a directory recursively.
 687  * Returns:
 688  *      0 if it was successfully deleted,
 689  *      -1 if an error occurred
 690  */
 691 static int
 692 comics_remove_dir (gchar *path_name)
 693 {
 694         GDir  *content_dir;
 695         const gchar *filename;
 696         gchar *filename_with_path;
 697
 698         if (g_file_test (path_name, G_FILE_TEST_IS_DIR)) {
 699                 content_dir = g_dir_open  (path_name, 0, NULL);
 700                 filename  = g_dir_read_name (content_dir);
 701                 while (filename) {
 702                         filename_with_path =
 703                                 g_build_filename (path_name,
 704                                                   filename, NULL);
 705                         comics_remove_dir (filename_with_path);
 706                         g_free (filename_with_path);
 707                         filename = g_dir_read_name (content_dir);
 708                 }
 709                 g_dir_close (content_dir);
 710         }
 711         /* Note from g_remove() documentation: on Windows, it is in general not
 712          * possible to remove a file that is open to some process, or mapped
 713          * into memory.*/
 714         return (g_remove (path_name));
 715 }
 716
 717 static void
 718 comics_document_finalize (GObject *object)
 719 {
 720         ComicsDocument *comics_document = COMICS_DOCUMENT (object);
 721
 722         if (comics_document->decompress_tmp) {
 723                 if (comics_remove_dir (comics_document->dir) == -1)
 724                         g_warning (_("There was an error deleting “%s”."),
 725                                    comics_document->dir);
 726                 g_free (comics_document->dir);
 727         }
 728
 729         if (comics_document->page_names) {
 730                 g_ptr_array_foreach (comics_document->page_names, (GFunc) g_free, NULL);
 731                 g_ptr_array_free (comics_document->page_names, TRUE);
 732         }
 733
 734         g_free (comics_document->archive);
 735         g_free (comics_document->selected_command);
 736         g_free (comics_document->extract_command);
 737         g_free (comics_document->list_command);
 738
 739         G_OBJECT_CLASS (comics_document_parent_class)->finalize (object);
 740 }
 741
 742 static void
 743 comics_document_class_init (ComicsDocumentClass *klass)
 744 {
 745         GObjectClass    *gobject_class = G_OBJECT_CLASS (klass);
 746         EvDocumentClass *ev_document_class = EV_DOCUMENT_CLASS (klass);
 747
 748         gobject_class->finalize = comics_document_finalize;
 749
 750         ev_document_class->load = comics_document_load;
 751         ev_document_class->save = comics_document_save;
 752         ev_document_class->get_n_pages = comics_document_get_n_pages;
 753         ev_document_class->get_page_size = comics_document_get_page_size;
 754         ev_document_class->render = comics_document_render;
 755 }
 756
 757 static void
 758 comics_document_init (ComicsDocument *comics_document)
 759 {
 760         comics_document->archive = NULL;
 761         comics_document->page_names = NULL;
 762         comics_document->extract_command = NULL;
 763 }
 764
 765 /* Returns a list of file extensions supported by gdk-pixbuf */
 766 static GSList*
 767 get_supported_image_extensions()
 768 {
 769         GSList *extensions = NULL;
 770         GSList *formats = gdk_pixbuf_get_formats ();
 771         GSList *l;
 772
 773         for (l = formats; l != NULL; l = l->next) {
 774                 int i;
 775                 gchar **ext = gdk_pixbuf_format_get_extensions (l->data);
 776
 777                 for (i = 0; ext[i] != NULL; i++) {
 778                         extensions = g_slist_append (extensions,
 779                                                      g_strdup (ext[i]));
 780                 }
 781
 782                 g_strfreev (ext);
 783         }
 784
 785         g_slist_free (formats);
 786         return extensions;
 787 }
 788
 789 static GdkPixbuf *
 790 comics_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document,
 791                                           EvRenderContext      *rc,
 792                                           gboolean              border)
 793 {
 794         GdkPixbuf *thumbnail;
 795
 796         thumbnail = comics_document_render_pixbuf (EV_DOCUMENT (document), rc);
 797
 798         if (border) {
 799               GdkPixbuf *tmp_pixbuf = thumbnail;
 800
 801               thumbnail = ev_document_misc_get_thumbnail_frame (-1, -1, tmp_pixbuf);
 802               g_object_unref (tmp_pixbuf);
 803         }
 804
 805         return thumbnail;
 806 }
 807
 808 static void
 809 comics_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 810                                            EvRenderContext      *rc,
 811                                            gint                 *width,
 812                                            gint                 *height)
 813 {
 814         gdouble page_width, page_height;
 815
 816         comics_document_get_page_size (EV_DOCUMENT (document), rc->page,
 817                                        &page_width, &page_height);
 818
 819         if (rc->rotation == 90 || rc->rotation == 270) {
 820                 *width = (gint) (page_height * rc->scale);
 821                 *height = (gint) (page_width * rc->scale);
 822         } else {
 823                 *width = (gint) (page_width * rc->scale);
 824                 *height = (gint) (page_height * rc->scale);
 825         }
 826 }
 827
 828 static void
 829 comics_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
 830 {
 831         iface->get_thumbnail = comics_document_thumbnails_get_thumbnail;
 832         iface->get_dimensions = comics_document_thumbnails_get_dimensions;
 833 }
 834
 835 static char**
 836 extract_argv (EvDocument *document, gint page)
 837 {
 838         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 839         char **argv;
 840         char *command_line, *quoted_archive, *quoted_filename;
 841         GError *err = NULL;
 842
 843         if (page >= comics_document->page_names->len)
 844                 return NULL;
 845
 846         quoted_archive = g_shell_quote (comics_document->archive);
 847         if (comics_document->regex_arg) {
 848                 quoted_filename = comics_regex_quote (comics_document->page_names->pdata[page]);
 849         } else {
 850                 quoted_filename = g_shell_quote (comics_document->page_names->pdata[page]);
 851         }
 852
 853         command_line = g_strdup_printf ("%s -- %s %s",
 854                                         comics_document->extract_command,
 855                                         quoted_archive,
 856                                         quoted_filename);
 857
 858         g_shell_parse_argv (command_line, NULL, &argv, &err);
 859
 860         if (err) {
 861                 g_warning (_("Error %s"), err->message);
 862                 g_error_free (err);
 863                 return NULL;
 864         }
 865
 866         g_free (command_line);
 867         g_free (quoted_archive);
 868         g_free (quoted_filename);
 869         return argv;
 870 }