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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  19  */
  20
  21 #include <config.h>
  22
  23 #include <unistd.h>
  24 #include <string.h>
  25 #include <stdlib.h>
  26 #include <errno.h>
  27
  28 #include <glib.h>
  29 #include <glib/gi18n-lib.h>
  30 #include <glib/gstdio.h>
  31 #include <gio/gio.h>
  32
  33 #ifdef G_OS_WIN32
  34 # define WIFEXITED(x) ((x) != 3)
  35 # define WEXITSTATUS(x) (x)
  36 #else
  37 # include <sys/wait.h>
  38 #endif
  39
  40 #include "comics-document.h"
  41 #include "ev-document-misc.h"
  42 #include "ev-document-thumbnails.h"
  43 #include "ev-file-helpers.h"
  44
  45 #ifdef G_OS_WIN32
  46 /* On windows g_spawn_command_line_sync reads stdout in O_BINARY mode, not in O_TEXT mode.
  47  * As a consequence, newlines are in a platform dependent representation (\r\n). This
  48  * might be considered a bug in glib.
  49  */
  50 #define EV_EOL "\r\n"
  51 #else
  52 #define EV_EOL "\n"
  53 #endif
  54
  55 typedef enum
  56 {
  57         RARLABS,
  58         GNAUNRAR,
  59         UNZIP,
  60         P7ZIP,
  61         TAR
  62 } ComicBookDecompressType;
  63
  64 typedef struct _ComicsDocumentClass ComicsDocumentClass;
  65
  66 struct _ComicsDocumentClass
  67 {
  68         EvDocumentClass parent_class;
  69 };
  70
  71 struct _ComicsDocument
  72 {
  73         EvDocument parent_instance;
  74
  75         gchar    *archive, *dir;
  76         GPtrArray *page_names;
  77         gchar    *selected_command;
  78         gchar    *extract_command, *list_command, *decompress_tmp;
  79         gint     offset;
  80         ComicBookDecompressType command_usage;
  81 };
  82
  83 #define OFFSET_7Z 53
  84 #define NO_OFFSET 0
  85
  86 /* For perfomance reasons of 7z* we've choosen to decompress on the temporary
  87  * directory instead of decompressing on the stdout */
  88
  89 /**
  90  * @extract: command line arguments to pass to extract a file from the archive
  91  *   to stdout.
  92  * @list: command line arguments to list the archive contents
  93  * @decompress_tmp: command line arguments to pass to extract the archive
  94  *   into a directory.
  95  * @offset: the position offset of the filename on each line in the output of
  96  *   running the @list command
  97  */
  98 typedef struct {
  99         char *extract;
 100         char *list;
 101         char *decompress_tmp;
 102         gint offset;
 103 } ComicBookDecompressCommand;
 104
 105 static const ComicBookDecompressCommand command_usage_def[] = {
 106         /* RARLABS unrar */
 107         {"%s p -c- -ierr --", "%s vb -c- -- %s", NULL             , NO_OFFSET},
 108
 109         /* GNA! unrar */
 110         {NULL               , "%s t %s"        , "%s -xf %s %s"   , NO_OFFSET},
 111
 112         /* unzip */
 113         {"%s -p -C --"      , "%s -Z -1 -- %s" , NULL             , NO_OFFSET},
 114
 115         /* 7zip */
 116         {NULL               , "%s l -- %s"     , "%s x -y %s -o%s", OFFSET_7Z},
 117
 118         /* tar */
 119         {"%s -xOf"          , "%s -tf %s"      , NULL             , NO_OFFSET}
 120 };
 121
 122 static void       comics_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface);
 123
 124 static GSList*    get_supported_image_extensions (void);
 125 static void       get_page_size_area_prepared_cb (GdkPixbufLoader *loader,
 126                                                   gpointer data);
 127 static void       render_pixbuf_size_prepared_cb (GdkPixbufLoader *loader,
 128                                                   gint width,
 129                                                   gint height,
 130                                                   gpointer data);
 131 static char**     extract_argv                   (EvDocument *document,
 132                                                   gint page);
 133
 134
 135 EV_BACKEND_REGISTER_WITH_CODE (ComicsDocument, comics_document,
 136         {
 137                 EV_BACKEND_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_THUMBNAILS,
 138                                                 comics_document_document_thumbnails_iface_init);
 139         } );
 140
 141
 142 /* This function manages the command for decompressing a comic book */
 143 static gboolean
 144 comics_decompress_temp_dir (const gchar *command_decompress_tmp,
 145                             const gchar *command,
 146                             GError      **error)
 147 {
 148         gboolean success;
 149         gchar *std_out, *basename;
 150         GError *err = NULL;
 151         gint retval;
 152
 153         success = g_spawn_command_line_sync (command_decompress_tmp, &std_out,
 154                                              NULL, &retval, &err);
 155         basename = g_path_get_basename (command);
 156         if (!success) {
 157                 g_set_error (error,
 158                              EV_DOCUMENT_ERROR,
 159                              EV_DOCUMENT_ERROR_INVALID,
 160                              _("Error launching the command “%s” in order to "
 161                              "decompress the comic book: %s"),
 162                              basename,
 163                              err->message);
 164                 g_error_free (err);
 165         } else if (WIFEXITED (retval)) {
 166                 if (WEXITSTATUS (retval) == EXIT_SUCCESS) {
 167                         g_free (std_out);
 168                         g_free (basename);
 169                         return TRUE;
 170                 } else {
 171                         g_set_error (error,
 172                                      EV_DOCUMENT_ERROR,
 173                                      EV_DOCUMENT_ERROR_INVALID,
 174                                      _("The command “%s” failed at "
 175                                      "decompressing the comic book."),
 176                                      basename);
 177                         g_free (std_out);
 178                 }
 179         } else {
 180                 g_set_error (error,
 181                              EV_DOCUMENT_ERROR,
 182                              EV_DOCUMENT_ERROR_INVALID,
 183                              _("The command “%s” did not end normally."),
 184                              basename);
 185                 g_free (std_out);
 186         }
 187         g_free (basename);
 188         return FALSE;
 189 }
 190
 191 /* This function shows how to use the choosen command for decompressing a
 192  * comic book file. It modifies fields of the ComicsDocument struct with
 193  * this information */
 194 static gboolean
 195 comics_generate_command_lines (ComicsDocument *comics_document,
 196                                GError         **error)
 197 {
 198         gchar *quoted_file;
 199         gchar *quoted_command;
 200         ComicBookDecompressType type;
 201
 202         type = comics_document->command_usage;
 203         quoted_file = g_shell_quote (comics_document->archive);
 204         quoted_command = g_shell_quote (comics_document->selected_command);
 205
 206         comics_document->extract_command =
 207                             g_strdup_printf (command_usage_def[type].extract,
 208                                              quoted_command);
 209         comics_document->list_command =
 210                             g_strdup_printf (command_usage_def[type].list,
 211                                              quoted_command, quoted_file);
 212         comics_document->offset = command_usage_def[type].offset;
 213         if (command_usage_def[type].decompress_tmp) {
 214                 comics_document->dir = ev_mkdtemp ("evince-comics-XXXXXX", error);
 215                 if (comics_document->dir == NULL)
 216                         return FALSE;
 217
 218                 /* unrar-free can't create directories, but ev_mkdtemp already created the dir */
 219
 220                 comics_document->decompress_tmp =
 221                         g_strdup_printf (command_usage_def[type].decompress_tmp,
 222                                          quoted_command, quoted_file,
 223                                          comics_document->dir);
 224                 g_free (quoted_file);
 225                 g_free (quoted_command);
 226
 227                 if (!comics_decompress_temp_dir (comics_document->decompress_tmp,
 228                     comics_document->selected_command, error))
 229                         return FALSE;
 230                 else
 231                         return TRUE;
 232         } else {
 233                 g_free (quoted_file);
 234                 g_free (quoted_command);
 235                 return TRUE;
 236         }
 237
 238 }
 239
 240 /* This function chooses an external command for decompressing a comic
 241  * book based on its mime tipe. */
 242 static gboolean
 243 comics_check_decompress_command (gchar          *mime_type,
 244                                  ComicsDocument *comics_document,
 245                                  GError         **error)
 246 {
 247         gboolean success;
 248         gchar *std_out, *std_err;
 249         gint retval;
 250         GError *err = NULL;
 251
 252         /* FIXME, use proper cbr/cbz mime types once they're
 253          * included in shared-mime-info */
 254
 255         if (!strcmp (mime_type, "application/x-cbr") ||
 256             !strcmp (mime_type, "application/x-rar")) {
 257                 /* The RARLAB provides a no-charge proprietary (freeware)
 258                 * decompress-only client for Linux called unrar. Another
 259                 * option is a GPLv2-licensed command-line tool developed by
 260                 * the Gna! project. Confusingly enough, the free software RAR
 261                 * decoder is also named unrar. For this reason we need to add
 262                 * some lines for disambiguation. Sorry for the added the
 263                 * complexity but it's life :)
 264                 * Finally, some distributions, like Debian, rename this free
 265                 * option as unrar-free.
 266                 * */
 267                 comics_document->selected_command =
 268                                         g_find_program_in_path ("unrar");
 269                 if (comics_document->selected_command) {
 270                         /* We only use std_err to avoid printing useless error
 271                          * messages on the terminal */
 272                         success =
 273                                 g_spawn_command_line_sync (
 274                                               comics_document->selected_command,
 275                                                            &std_out, &std_err,
 276                                                            &retval, &err);
 277                         if (!success) {
 278                                 g_propagate_error (error, err);
 279                                 g_error_free (err);
 280                                 return FALSE;
 281                         /* I don't check retval status because RARLAB unrar
 282                          * doesn't have a way to return 0 without involving an
 283                          * operation with a file*/
 284                         } else if (WIFEXITED (retval)) {
 285                                 if (g_strrstr (std_out,"freeware") != NULL)
 286                                         /* The RARLAB freeware client */
 287                                         comics_document->command_usage = RARLABS;
 288                                 else
 289                                         /* The Gna! free software client */
 290                                         comics_document->command_usage = GNAUNRAR;
 291
 292                                 g_free (std_out);
 293                                 g_free (std_err);
 294                                 return TRUE;
 295                         }
 296                 }
 297                 /* The Gna! free software client with Debian naming convention */
 298                 comics_document->selected_command =
 299                                 g_find_program_in_path ("unrar-free");
 300                 if (comics_document->selected_command) {
 301                         comics_document->command_usage = GNAUNRAR;
 302                         return TRUE;
 303                 }
 304
 305         } else if (!strcmp (mime_type, "application/x-cbz") ||
 306                    !strcmp (mime_type, "application/zip")) {
 307                 /* InfoZIP's unzip program */
 308                 comics_document->selected_command =
 309                                 g_find_program_in_path ("unzip");
 310                 if (comics_document->selected_command) {
 311                         comics_document->command_usage = UNZIP;
 312                         return TRUE;
 313                 }
 314
 315         } else if (!strcmp (mime_type, "application/x-cb7") ||
 316                    !strcmp (mime_type, "application/x-7z-compressed")) {
 317                 /* 7zr, 7za and 7z are the commands from the p7zip project able
 318                  * to decompress .7z files */
 319                         comics_document->selected_command =
 320                                 g_find_program_in_path ("7zr");
 321                         if (comics_document->selected_command) {
 322                                 comics_document->command_usage = P7ZIP;
 323                                 return TRUE;
 324                         }
 325                         comics_document->selected_command =
 326                                 g_find_program_in_path ("7za");
 327                         if (comics_document->selected_command) {
 328                                 comics_document->command_usage = P7ZIP;
 329                                 return TRUE;
 330                         }
 331                         comics_document->selected_command =
 332                                 g_find_program_in_path ("7z");
 333                         if (comics_document->selected_command) {
 334                                 comics_document->command_usage = P7ZIP;
 335                                 return TRUE;
 336                         }
 337         } else if (!strcmp (mime_type, "application/x-cbt") ||
 338                    !strcmp (mime_type, "application/x-tar")) {
 339                 /* tar utility (Tape ARchive) */
 340                 comics_document->selected_command =
 341                                 g_find_program_in_path ("tar");
 342                 if (comics_document->selected_command) {
 343                         comics_document->command_usage = TAR;
 344                         return TRUE;
 345                 }
 346         } else {
 347                 g_set_error (error,
 348                              EV_DOCUMENT_ERROR,
 349                              EV_DOCUMENT_ERROR_INVALID,
 350                              _("Not a comic book MIME type: %s"),
 351                              mime_type);
 352                              return FALSE;
 353         }
 354         g_set_error_literal (error,
 355                              EV_DOCUMENT_ERROR,
 356                              EV_DOCUMENT_ERROR_INVALID,
 357                              _("Can't find an appropriate command to "
 358                              "decompress this type of comic book"));
 359         return FALSE;
 360 }
 361
 362 static int
 363 sort_page_names (gconstpointer a,
 364                  gconstpointer b)
 365 {
 366   return strcmp (* (const char **) a, * (const char **) b);
 367 }
 368
 369 static gboolean
 370 comics_document_load (EvDocument *document,
 371                       const char *uri,
 372                       GError    **error)
 373 {
 374         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 375         GSList *supported_extensions;
 376         gchar *std_out;
 377         gchar *mime_type;
 378         gchar **cb_files, *cb_file;
 379         gboolean success;
 380         int i, retval;
 381         GError *err = NULL;
 382
 383         comics_document->archive = g_filename_from_uri (uri, NULL, error);
 384         if (!comics_document->archive)
 385                 return FALSE;
 386
 387         mime_type = ev_file_get_mime_type (uri, FALSE, &err);
 388         if (!mime_type) {
 389                 if (err) {
 390                         g_propagate_error (error, err);
 391                 } else {
 392                         g_set_error_literal (error,
 393                                              EV_DOCUMENT_ERROR,
 394                                              EV_DOCUMENT_ERROR_INVALID,
 395                                              _("Unknown MIME Type"));
 396                 }
 397
 398                 return FALSE;
 399         }
 400
 401         if (!comics_check_decompress_command (mime_type, comics_document,
 402         error)) {
 403                 g_free (mime_type);
 404                 return FALSE;
 405         } else if (!comics_generate_command_lines (comics_document, error)) {
 406                    g_free (mime_type);
 407                 return FALSE;
 408         }
 409
 410         g_free (mime_type);
 411
 412         /* Get list of files in archive */
 413         success = g_spawn_command_line_sync (comics_document->list_command,
 414                                              &std_out, NULL, &retval, error);
 415
 416         if (!success) {
 417                 return FALSE;
 418         } else if (!WIFEXITED(retval) || WEXITSTATUS(retval) != EXIT_SUCCESS) {
 419                 g_set_error_literal (error,
 420                                      EV_DOCUMENT_ERROR,
 421                                      EV_DOCUMENT_ERROR_INVALID,
 422                                      _("File corrupted"));
 423                 return FALSE;
 424         }
 425
 426         /* FIXME: is this safe against filenames containing \n in the archive ? */
 427         cb_files = g_strsplit (std_out, EV_EOL, 0);
 428
 429         g_free (std_out);
 430
 431         if (!cb_files) {
 432                 g_set_error_literal (error,
 433                                      EV_DOCUMENT_ERROR,
 434                                      EV_DOCUMENT_ERROR_INVALID,
 435                                      _("No files in archive"));
 436                 return FALSE;
 437         }
 438
 439         comics_document->page_names = g_ptr_array_sized_new (64);
 440
 441         supported_extensions = get_supported_image_extensions ();
 442         for (i = 0; cb_files[i] != NULL; i++) {
 443                 if (comics_document->offset != NO_OFFSET) {
 444                         if (g_utf8_strlen (cb_files[i],-1) >
 445                             comics_document->offset) {
 446                                 cb_file =
 447                                         g_utf8_offset_to_pointer (cb_files[i],
 448                                                        comics_document->offset);
 449                         } else {
 450                                 continue;
 451                         }
 452                 } else {
 453                         cb_file = cb_files[i];
 454                 }
 455                 gchar *suffix = g_strrstr (cb_file, ".");
 456                 if (!suffix)
 457                         continue;
 458                 suffix = g_ascii_strdown (suffix + 1, -1);
 459                 if (g_slist_find_custom (supported_extensions, suffix,
 460                                          (GCompareFunc) strcmp) != NULL) {
 461                         g_ptr_array_add (comics_document->page_names,
 462                                          g_strstrip (g_strdup (cb_file)));
 463                 }
 464                 g_free (suffix);
 465         }
 466         g_strfreev (cb_files);
 467         g_slist_foreach (supported_extensions, (GFunc) g_free, NULL);
 468         g_slist_free (supported_extensions);
 469
 470         if (comics_document->page_names->len == 0) {
 471                 g_set_error (error,
 472                              EV_DOCUMENT_ERROR,
 473                              EV_DOCUMENT_ERROR_INVALID,
 474                              _("No images found in archive %s"),
 475                              uri);
 476                 return FALSE;
 477         }
 478
 479         /* Now sort the pages */
 480         g_ptr_array_sort (comics_document->page_names, sort_page_names);
 481
 482         return TRUE;
 483 }
 484
 485
 486 static gboolean
 487 comics_document_save (EvDocument *document,
 488                       const char *uri,
 489                       GError    **error)
 490 {
 491         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 492
 493         return ev_xfer_uri_simple (comics_document->archive, uri, error);
 494 }
 495
 496 static int
 497 comics_document_get_n_pages (EvDocument *document)
 498 {
 499         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 500
 501         if (comics_document->page_names == NULL)
 502                 return 0;
 503
 504         return comics_document->page_names->len;
 505 }
 506
 507 static void
 508 comics_document_get_page_size (EvDocument *document,
 509                                EvPage     *page,
 510                                double     *width,
 511                                double     *height)
 512 {
 513         GdkPixbufLoader *loader;
 514         char **argv;
 515         guchar buf[1024];
 516         gboolean success, got_size = FALSE;
 517         gint outpipe = -1;
 518         GPid child_pid;
 519         gssize bytes;
 520         GdkPixbuf *pixbuf;
 521         gchar *filename;
 522         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 523
 524         if (!comics_document->decompress_tmp) {
 525                 argv = extract_argv (document, page->index);
 526                 success = g_spawn_async_with_pipes (NULL, argv, NULL,
 527                                                     G_SPAWN_SEARCH_PATH |
 528                                                     G_SPAWN_STDERR_TO_DEV_NULL,
 529                                                     NULL, NULL,
 530                                                     &child_pid,
 531                                                     NULL, &outpipe, NULL, NULL);
 532                 g_strfreev (argv);
 533                 g_return_if_fail (success == TRUE);
 534
 535                 loader = gdk_pixbuf_loader_new ();
 536                 g_signal_connect (loader, "area-prepared",
 537                                   G_CALLBACK (get_page_size_area_prepared_cb),
 538                                   &got_size);
 539
 540                 while (outpipe >= 0) {
 541                         bytes = read (outpipe, buf, 1024);
 542
 543                         if (bytes > 0)
 544                         gdk_pixbuf_loader_write (loader, buf, bytes, NULL);
 545                         if (bytes <= 0 || got_size) {
 546                                 close (outpipe);
 547                                 outpipe = -1;
 548                                 gdk_pixbuf_loader_close (loader, NULL);
 549                         }
 550                 }
 551
 552                 if (gdk_pixbuf_loader_get_pixbuf (loader)) {
 553                         pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
 554                         if (width)
 555                                 *width = gdk_pixbuf_get_width (pixbuf);
 556                         if (height)
 557                                 *height = gdk_pixbuf_get_height (pixbuf);
 558                 }
 559
 560                 g_spawn_close_pid (child_pid);
 561                 g_object_unref (loader);
 562         } else {
 563                 filename = g_build_filename (comics_document->dir,
 564                                              (char *) comics_document->page_names->pdata[page->index],
 565                                              NULL);
 566                 pixbuf = gdk_pixbuf_new_from_file (filename, NULL);
 567                 g_free (filename);
 568                 if (width)
 569                         *width = gdk_pixbuf_get_width (pixbuf);
 570                 if (height)
 571                         *height = gdk_pixbuf_get_height (pixbuf);
 572         }
 573 }
 574
 575 static void
 576 get_page_size_area_prepared_cb (GdkPixbufLoader *loader,
 577                                 gpointer         data)
 578 {
 579         gboolean *got_size = data;
 580         *got_size = TRUE;
 581 }
 582
 583 static GdkPixbuf *
 584 comics_document_render_pixbuf (EvDocument      *document,
 585                                EvRenderContext *rc)
 586 {
 587         GdkPixbufLoader *loader;
 588         GdkPixbuf *rotated_pixbuf;
 589         char **argv;
 590         guchar buf[4096];
 591         gboolean success;
 592         gint outpipe = -1;
 593         GPid child_pid;
 594         gssize bytes;
 595         gint width, height;
 596         gchar *filename;
 597         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 598
 599         if (!comics_document->decompress_tmp) {
 600                 argv = extract_argv (document, rc->page->index);
 601                 success = g_spawn_async_with_pipes (NULL, argv, NULL,
 602                                                     G_SPAWN_SEARCH_PATH |
 603                                                     G_SPAWN_STDERR_TO_DEV_NULL,
 604                                                     NULL, NULL,
 605                                                     &child_pid,
 606                                                     NULL, &outpipe, NULL, NULL);
 607                 g_strfreev (argv);
 608                 g_return_val_if_fail (success == TRUE, NULL);
 609
 610                 loader = gdk_pixbuf_loader_new ();
 611                 g_signal_connect (loader, "size-prepared",
 612                                   G_CALLBACK (render_pixbuf_size_prepared_cb),
 613                                   &rc->scale);
 614
 615                 while (outpipe >= 0) {
 616                         bytes = read (outpipe, buf, 4096);
 617
 618                         if (bytes > 0) {
 619                                 gdk_pixbuf_loader_write (loader, buf, bytes,
 620                                 NULL);
 621                         } else if (bytes <= 0) {
 622                                 close (outpipe);
 623                                 gdk_pixbuf_loader_close (loader, NULL);
 624                                 outpipe = -1;
 625                         }
 626                 }
 627
 628                 rotated_pixbuf = gdk_pixbuf_rotate_simple (
 629                                         gdk_pixbuf_loader_get_pixbuf (loader),
 630                                         360 - rc->rotation);
 631                 g_spawn_close_pid (child_pid);
 632                 g_object_unref (loader);
 633         } else {
 634                 filename =
 635                         g_build_filename (comics_document->dir,
 636                                           (char *) comics_document->page_names->pdata[rc->page->index],
 637                                           NULL);
 638
 639                 gdk_pixbuf_get_file_info (filename, &width, &height);
 640
 641                 rotated_pixbuf =
 642                   gdk_pixbuf_rotate_simple (gdk_pixbuf_new_from_file_at_size (
 643                                             filename, width * (rc->scale) + 0.5,
 644                                             height * (rc->scale) + 0.5, NULL),
 645                                             360 - rc->rotation);
 646                 g_free (filename);
 647
 648         }
 649         return rotated_pixbuf;
 650 }
 651
 652 static cairo_surface_t *
 653 comics_document_render (EvDocument      *document,
 654                         EvRenderContext *rc)
 655 {
 656         GdkPixbuf       *pixbuf;
 657         cairo_surface_t *surface;
 658
 659         pixbuf = comics_document_render_pixbuf (document, rc);
 660         surface = ev_document_misc_surface_from_pixbuf (pixbuf);
 661         g_object_unref (pixbuf);
 662
 663         return surface;
 664 }
 665
 666 static void
 667 render_pixbuf_size_prepared_cb (GdkPixbufLoader *loader,
 668                                 gint             width,
 669                                 gint             height,
 670                                 gpointer         data)
 671 {
 672         double *scale = data;
 673         int w = (width  * (*scale) + 0.5);
 674         int h = (height * (*scale) + 0.5);
 675
 676         gdk_pixbuf_loader_set_size (loader, w, h);
 677 }
 678
 679 /**
 680  * comics_remove_dir: Removes a directory recursively.
 681  * Returns:
 682  *      0 if it was successfully deleted,
 683  *      -1 if an error occurred
 684  */
 685 static int
 686 comics_remove_dir (gchar *path_name)
 687 {
 688         GDir  *content_dir;
 689         const gchar *filename;
 690         gchar *filename_with_path;
 691
 692         if (g_file_test (path_name, G_FILE_TEST_IS_DIR)) {
 693                 content_dir = g_dir_open  (path_name, 0, NULL);
 694                 filename  = g_dir_read_name (content_dir);
 695                 while (filename) {
 696                         filename_with_path =
 697                                 g_build_filename (path_name,
 698                                                   filename, NULL);
 699                         comics_remove_dir (filename_with_path);
 700                         g_free (filename_with_path);
 701                         filename = g_dir_read_name (content_dir);
 702                 }
 703                 g_dir_close (content_dir);
 704         }
 705         /* Note from g_remove() documentation: on Windows, it is in general not
 706          * possible to remove a file that is open to some process, or mapped
 707          * into memory.*/
 708         return (g_remove (path_name));
 709 }
 710
 711 static void
 712 comics_document_finalize (GObject *object)
 713 {
 714         ComicsDocument *comics_document = COMICS_DOCUMENT (object);
 715
 716         if (comics_document->decompress_tmp) {
 717                 if (comics_remove_dir (comics_document->dir) == -1)
 718                         g_warning (_("There was an error deleting “%s”."),
 719                                    comics_document->dir);
 720                 g_free (comics_document->dir);
 721         }
 722
 723         if (comics_document->page_names) {
 724                 g_ptr_array_foreach (comics_document->page_names, (GFunc) g_free, NULL);
 725                 g_ptr_array_free (comics_document->page_names, TRUE);
 726         }
 727
 728         g_free (comics_document->archive);
 729         g_free (comics_document->selected_command);
 730         g_free (comics_document->extract_command);
 731         g_free (comics_document->list_command);
 732
 733         G_OBJECT_CLASS (comics_document_parent_class)->finalize (object);
 734 }
 735
 736 static void
 737 comics_document_class_init (ComicsDocumentClass *klass)
 738 {
 739         GObjectClass    *gobject_class = G_OBJECT_CLASS (klass);
 740         EvDocumentClass *ev_document_class = EV_DOCUMENT_CLASS (klass);
 741
 742         gobject_class->finalize = comics_document_finalize;
 743
 744         ev_document_class->load = comics_document_load;
 745         ev_document_class->save = comics_document_save;
 746         ev_document_class->get_n_pages = comics_document_get_n_pages;
 747         ev_document_class->get_page_size = comics_document_get_page_size;
 748         ev_document_class->render = comics_document_render;
 749 }
 750
 751 static void
 752 comics_document_init (ComicsDocument *comics_document)
 753 {
 754         comics_document->archive = NULL;
 755         comics_document->page_names = NULL;
 756         comics_document->extract_command = NULL;
 757 }
 758
 759 /* Returns a list of file extensions supported by gdk-pixbuf */
 760 static GSList*
 761 get_supported_image_extensions()
 762 {
 763         GSList *extensions = NULL;
 764         GSList *formats = gdk_pixbuf_get_formats ();
 765         GSList *l;
 766
 767         for (l = formats; l != NULL; l = l->next) {
 768                 int i;
 769                 gchar **ext = gdk_pixbuf_format_get_extensions (l->data);
 770
 771                 for (i = 0; ext[i] != NULL; i++) {
 772                         extensions = g_slist_append (extensions,
 773                                                      g_strdup (ext[i]));
 774                 }
 775
 776                 g_strfreev (ext);
 777         }
 778
 779         g_slist_free (formats);
 780         return extensions;
 781 }
 782
 783 static GdkPixbuf *
 784 comics_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document,
 785                                           EvRenderContext      *rc,
 786                                           gboolean              border)
 787 {
 788         GdkPixbuf *thumbnail;
 789
 790         thumbnail = comics_document_render_pixbuf (EV_DOCUMENT (document), rc);
 791
 792         if (border) {
 793               GdkPixbuf *tmp_pixbuf = thumbnail;
 794
 795               thumbnail = ev_document_misc_get_thumbnail_frame (-1, -1, tmp_pixbuf);
 796               g_object_unref (tmp_pixbuf);
 797         }
 798
 799         return thumbnail;
 800 }
 801
 802 static void
 803 comics_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 804                                            EvRenderContext      *rc,
 805                                            gint                 *width,
 806                                            gint                 *height)
 807 {
 808         gdouble page_width, page_height;
 809
 810         comics_document_get_page_size (EV_DOCUMENT (document), rc->page,
 811                                        &page_width, &page_height);
 812
 813         if (rc->rotation == 90 || rc->rotation == 270) {
 814                 *width = (gint) (page_height * rc->scale);
 815                 *height = (gint) (page_width * rc->scale);
 816         } else {
 817                 *width = (gint) (page_width * rc->scale);
 818                 *height = (gint) (page_height * rc->scale);
 819         }
 820 }
 821
 822 static void
 823 comics_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
 824 {
 825         iface->get_thumbnail = comics_document_thumbnails_get_thumbnail;
 826         iface->get_dimensions = comics_document_thumbnails_get_dimensions;
 827 }
 828
 829 static char**
 830 extract_argv (EvDocument *document, gint page)
 831 {
 832         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 833         char **argv;
 834         char *command_line, *quoted_archive, *quoted_filename;
 835         GError *err = NULL;
 836
 837         if (page >= comics_document->page_names->len)
 838                 return NULL;
 839
 840         quoted_archive = g_shell_quote (comics_document->archive);
 841         quoted_filename = g_shell_quote (comics_document->page_names->pdata[page]);
 842
 843         command_line = g_strdup_printf ("%s %s %s",
 844                                         comics_document->extract_command,
 845                                         quoted_archive,
 846                                         quoted_filename);
 847         g_shell_parse_argv (command_line, NULL, &argv, &err);
 848
 849         if (err) {
 850                 g_warning (_("Error %s"), err->message);
 851                 g_error_free (err);
 852                 return NULL;
 853         }
 854
 855         g_free (command_line);
 856         g_free (quoted_archive);
 857         g_free (quoted_filename);
 858         return argv;
 859 }