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) 2009-2010 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, *alternative_command;
  78         gchar    *extract_command, *list_command, *decompress_tmp;
  79         gboolean regex_arg;
  80         gint     offset;
  81         ComicBookDecompressType command_usage;
  82 };
  83
  84 #define OFFSET_7Z 53
  85 #define OFFSET_ZIP 2
  86 #define NO_OFFSET 0
  87
  88 /* For perfomance reasons of 7z* we've choosen to decompress on the temporary
  89  * directory instead of decompressing on the stdout */
  90
  91 /**
  92  * @extract: command line arguments to pass to extract a file from the archive
  93  *   to stdout.
  94  * @list: command line arguments to list the archive contents
  95  * @decompress_tmp: command line arguments to pass to extract the archive
  96  *   into a directory.
  97  * @regex_arg: whether the command can accept regex expressions
  98  * @offset: the position offset of the filename on each line in the output of
  99  *   running the @list command
 100  */
 101 typedef struct {
 102         char *extract;
 103         char *list;
 104         char *decompress_tmp;
 105         gboolean regex_arg;
 106         gint offset;
 107 } ComicBookDecompressCommand;
 108
 109 static const ComicBookDecompressCommand command_usage_def[] = {
 110         /* RARLABS unrar */
 111         {"%s p -c- -ierr --", "%s vb -c- -- %s", NULL             , FALSE, NO_OFFSET},
 112
 113         /* GNA! unrar */
 114         {NULL               , "%s t %s"        , "%s -xf %s %s"   , FALSE, NO_OFFSET},
 115
 116         /* unzip */
 117         {"%s -p -C --"      , "%s %s"          , NULL             , TRUE , OFFSET_ZIP},
 118
 119         /* 7zip */
 120         {NULL               , "%s l -- %s"     , "%s x -y %s -o%s", FALSE, OFFSET_7Z},
 121
 122         /* tar */
 123         {"%s -xOf"          , "%s -tf %s"      , NULL             , FALSE, NO_OFFSET}
 124 };
 125
 126 static void       comics_document_document_thumbnails_iface_init (EvDocumentThumbnailsInterface *iface);
 127
 128 static GSList*    get_supported_image_extensions (void);
 129 static void       get_page_size_area_prepared_cb (GdkPixbufLoader *loader,
 130                                                   gpointer data);
 131 static void       render_pixbuf_size_prepared_cb (GdkPixbufLoader *loader,
 132                                                   gint width,
 133                                                   gint height,
 134                                                   gpointer data);
 135 static char**     extract_argv                   (EvDocument *document,
 136                                                   gint page);
 137
 138
 139 EV_BACKEND_REGISTER_WITH_CODE (ComicsDocument, comics_document,
 140         {
 141                 EV_BACKEND_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_THUMBNAILS,
 142                                                 comics_document_document_thumbnails_iface_init);
 143         } );
 144
 145 /**
 146  * comics_regex_quote:
 147  * @unquoted_string: a literal string
 148  *
 149  * Quotes a string so unzip will not interpret the regex expressions of
 150  * @unquoted_string. Basically, this functions uses [] to disable regex
 151  * expressions. The return value must be freed with * g_free()
 152  *
 153  * Return value: quoted and disabled-regex string
 154  **/
 155 static gchar *
 156 comics_regex_quote (const gchar *unquoted_string)
 157 {
 158         const gchar *p;
 159         GString *dest;
 160
 161         dest = g_string_new ("'");
 162
 163         p = unquoted_string;
 164
 165         while (*p) {
 166                 switch (*p) {
 167                         /* * matches a sequence of 0 or more characters */
 168                         case ('*'):
 169                         /* ? matches exactly 1 charactere */
 170                         case ('?'):
 171                         /* [...]  matches any single character found inside
 172                          * the brackets. Disabling the first bracket is enough.
 173                          */
 174                         case ('['):
 175                                 g_string_append (dest, "[");
 176                                 g_string_append_c (dest, *p);
 177                                 g_string_append (dest, "]");
 178                                 break;
 179                         /* Because \ escapes regex expressions that we are
 180                          * disabling for unzip, we need to disable \ too */
 181                         case ('\\'):
 182                                 g_string_append (dest, "[\\\\]");
 183                                 break;
 184                         /* Escape single quote inside the string */
 185                         case ('\''):
 186                                 g_string_append (dest, "'\\''");
 187                                 break;
 188                         default:
 189                                 g_string_append_c (dest, *p);
 190                                 break;
 191                 }
 192                 ++p;
 193         }
 194         g_string_append_c (dest, '\'');
 195         return g_string_free (dest, FALSE);
 196 }
 197
 198
 199 /* This function manages the command for decompressing a comic book */
 200 static gboolean
 201 comics_decompress_temp_dir (const gchar *command_decompress_tmp,
 202                             const gchar *command,
 203                             GError      **error)
 204 {
 205         gboolean success;
 206         gchar *std_out, *basename;
 207         GError *err = NULL;
 208         gint retval;
 209
 210         success = g_spawn_command_line_sync (command_decompress_tmp, &std_out,
 211                                              NULL, &retval, &err);
 212         basename = g_path_get_basename (command);
 213         if (!success) {
 214                 g_set_error (error,
 215                              EV_DOCUMENT_ERROR,
 216                              EV_DOCUMENT_ERROR_INVALID,
 217                              _("Error launching the command “%s” in order to "
 218                              "decompress the comic book: %s"),
 219                              basename,
 220                              err->message);
 221                 g_error_free (err);
 222         } else if (WIFEXITED (retval)) {
 223                 if (WEXITSTATUS (retval) == EXIT_SUCCESS) {
 224                         g_free (std_out);
 225                         g_free (basename);
 226                         return TRUE;
 227                 } else {
 228                         g_set_error (error,
 229                                      EV_DOCUMENT_ERROR,
 230                                      EV_DOCUMENT_ERROR_INVALID,
 231                                      _("The command “%s” failed at "
 232                                      "decompressing the comic book."),
 233                                      basename);
 234                         g_free (std_out);
 235                 }
 236         } else {
 237                 g_set_error (error,
 238                              EV_DOCUMENT_ERROR,
 239                              EV_DOCUMENT_ERROR_INVALID,
 240                              _("The command “%s” did not end normally."),
 241                              basename);
 242                 g_free (std_out);
 243         }
 244         g_free (basename);
 245         return FALSE;
 246 }
 247
 248 /* This function shows how to use the choosen command for decompressing a
 249  * comic book file. It modifies fields of the ComicsDocument struct with
 250  * this information */
 251 static gboolean
 252 comics_generate_command_lines (ComicsDocument *comics_document,
 253                                GError         **error)
 254 {
 255         gchar *quoted_file, *quoted_file_aux;
 256         gchar *quoted_command;
 257         ComicBookDecompressType type;
 258
 259         type = comics_document->command_usage;
 260         comics_document->regex_arg = command_usage_def[type].regex_arg;
 261         quoted_command = g_shell_quote (comics_document->selected_command);
 262         if (comics_document->regex_arg) {
 263                 quoted_file = comics_regex_quote (comics_document->archive);
 264                 quoted_file_aux = g_shell_quote (comics_document->archive);
 265                 comics_document->list_command =
 266                            g_strdup_printf (command_usage_def[type].list,
 267                                             comics_document->alternative_command,
 268                                             quoted_file_aux);
 269                 g_free (quoted_file_aux);
 270         } else {
 271                 quoted_file = g_shell_quote (comics_document->archive);
 272                 comics_document->list_command =
 273                                 g_strdup_printf (command_usage_def[type].list,
 274                                                  quoted_command, quoted_file);
 275         }
 276         comics_document->extract_command =
 277                             g_strdup_printf (command_usage_def[type].extract,
 278                                              quoted_command);
 279         comics_document->offset = command_usage_def[type].offset;
 280         if (command_usage_def[type].decompress_tmp) {
 281                 comics_document->dir = ev_mkdtemp ("evince-comics-XXXXXX", error);
 282                 if (comics_document->dir == NULL)
 283                         return FALSE;
 284
 285                 /* unrar-free can't create directories, but ev_mkdtemp already created the dir */
 286
 287                 comics_document->decompress_tmp =
 288                         g_strdup_printf (command_usage_def[type].decompress_tmp,
 289                                          quoted_command, quoted_file,
 290                                          comics_document->dir);
 291                 g_free (quoted_file);
 292                 g_free (quoted_command);
 293
 294                 if (!comics_decompress_temp_dir (comics_document->decompress_tmp,
 295                     comics_document->selected_command, error))
 296                         return FALSE;
 297                 else
 298                         return TRUE;
 299         } else {
 300                 g_free (quoted_file);
 301                 g_free (quoted_command);
 302                 return TRUE;
 303         }
 304
 305 }
 306
 307 /* This function chooses an external command for decompressing a comic
 308  * book based on its mime tipe. */
 309 static gboolean
 310 comics_check_decompress_command (gchar          *mime_type,
 311                                  ComicsDocument *comics_document,
 312                                  GError         **error)
 313 {
 314         gboolean success;
 315         gchar *std_out, *std_err;
 316         gint retval;
 317         GError *err = NULL;
 318
 319         /* FIXME, use proper cbr/cbz mime types once they're
 320          * included in shared-mime-info */
 321
 322         if (!strcmp (mime_type, "application/x-cbr") ||
 323             !strcmp (mime_type, "application/x-rar")) {
 324                 /* The RARLAB provides a no-charge proprietary (freeware)
 325                 * decompress-only client for Linux called unrar. Another
 326                 * option is a GPLv2-licensed command-line tool developed by
 327                 * the Gna! project. Confusingly enough, the free software RAR
 328                 * decoder is also named unrar. For this reason we need to add
 329                 * some lines for disambiguation. Sorry for the added the
 330                 * complexity but it's life :)
 331                 * Finally, some distributions, like Debian, rename this free
 332                 * option as unrar-free.
 333                 * */
 334                 comics_document->selected_command =
 335                                         g_find_program_in_path ("unrar");
 336                 if (comics_document->selected_command) {
 337                         /* We only use std_err to avoid printing useless error
 338                          * messages on the terminal */
 339                         success =
 340                                 g_spawn_command_line_sync (
 341                                               comics_document->selected_command,
 342                                                            &std_out, &std_err,
 343                                                            &retval, &err);
 344                         if (!success) {
 345                                 g_propagate_error (error, err);
 346                                 g_error_free (err);
 347                                 return FALSE;
 348                         /* I don't check retval status because RARLAB unrar
 349                          * doesn't have a way to return 0 without involving an
 350                          * operation with a file*/
 351                         } else if (WIFEXITED (retval)) {
 352                                 if (g_strrstr (std_out,"freeware") != NULL)
 353                                         /* The RARLAB freeware client */
 354                                         comics_document->command_usage = RARLABS;
 355                                 else
 356                                         /* The Gna! free software client */
 357                                         comics_document->command_usage = GNAUNRAR;
 358
 359                                 g_free (std_out);
 360                                 g_free (std_err);
 361                                 return TRUE;
 362                         }
 363                 }
 364                 /* The Gna! free software client with Debian naming convention */
 365                 comics_document->selected_command =
 366                                 g_find_program_in_path ("unrar-free");
 367                 if (comics_document->selected_command) {
 368                         comics_document->command_usage = GNAUNRAR;
 369                         return TRUE;
 370                 }
 371
 372         } else if (!strcmp (mime_type, "application/x-cbz") ||
 373                    !strcmp (mime_type, "application/zip")) {
 374                 /* InfoZIP's unzip program */
 375                 comics_document->selected_command =
 376                                 g_find_program_in_path ("unzip");
 377                 comics_document->alternative_command =
 378                                 g_find_program_in_path ("zipnote");
 379                 if (comics_document->selected_command &&
 380                     comics_document->alternative_command) {
 381                         comics_document->command_usage = UNZIP;
 382                         return TRUE;
 383                 }
 384
 385         } else if (!strcmp (mime_type, "application/x-cb7") ||
 386                    !strcmp (mime_type, "application/x-7z-compressed")) {
 387                 /* 7zr, 7za and 7z are the commands from the p7zip project able
 388                  * to decompress .7z files */
 389                         comics_document->selected_command =
 390                                 g_find_program_in_path ("7zr");
 391                         if (comics_document->selected_command) {
 392                                 comics_document->command_usage = P7ZIP;
 393                                 return TRUE;
 394                         }
 395                         comics_document->selected_command =
 396                                 g_find_program_in_path ("7za");
 397                         if (comics_document->selected_command) {
 398                                 comics_document->command_usage = P7ZIP;
 399                                 return TRUE;
 400                         }
 401                         comics_document->selected_command =
 402                                 g_find_program_in_path ("7z");
 403                         if (comics_document->selected_command) {
 404                                 comics_document->command_usage = P7ZIP;
 405                                 return TRUE;
 406                         }
 407         } else if (!strcmp (mime_type, "application/x-cbt") ||
 408                    !strcmp (mime_type, "application/x-tar")) {
 409                 /* tar utility (Tape ARchive) */
 410                 comics_document->selected_command =
 411                                 g_find_program_in_path ("tar");
 412                 if (comics_document->selected_command) {
 413                         comics_document->command_usage = TAR;
 414                         return TRUE;
 415                 }
 416         } else {
 417                 g_set_error (error,
 418                              EV_DOCUMENT_ERROR,
 419                              EV_DOCUMENT_ERROR_INVALID,
 420                              _("Not a comic book MIME type: %s"),
 421                              mime_type);
 422                              return FALSE;
 423         }
 424         g_set_error_literal (error,
 425                              EV_DOCUMENT_ERROR,
 426                              EV_DOCUMENT_ERROR_INVALID,
 427                              _("Can't find an appropriate command to "
 428                              "decompress this type of comic book"));
 429         return FALSE;
 430 }
 431
 432 static int
 433 sort_page_names (gconstpointer a,
 434                  gconstpointer b)
 435 {
 436   return strcmp (* (const char **) a, * (const char **) b);
 437 }
 438
 439 static gboolean
 440 comics_document_load (EvDocument *document,
 441                       const char *uri,
 442                       GError    **error)
 443 {
 444         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 445         GSList *supported_extensions;
 446         gchar *std_out;
 447         gchar *mime_type;
 448         gchar **cb_files, *cb_file;
 449         gboolean success;
 450         int i, retval;
 451         GError *err = NULL;
 452
 453         comics_document->archive = g_filename_from_uri (uri, NULL, error);
 454         if (!comics_document->archive)
 455                 return FALSE;
 456
 457         mime_type = ev_file_get_mime_type (uri, FALSE, &err);
 458         if (!mime_type) {
 459                 if (err) {
 460                         g_propagate_error (error, err);
 461                 } else {
 462                         g_set_error_literal (error,
 463                                              EV_DOCUMENT_ERROR,
 464                                              EV_DOCUMENT_ERROR_INVALID,
 465                                              _("Unknown MIME Type"));
 466                 }
 467
 468                 return FALSE;
 469         }
 470
 471         if (!comics_check_decompress_command (mime_type, comics_document,
 472         error)) {
 473                 g_free (mime_type);
 474                 return FALSE;
 475         } else if (!comics_generate_command_lines (comics_document, error)) {
 476                    g_free (mime_type);
 477                 return FALSE;
 478         }
 479
 480         g_free (mime_type);
 481
 482         /* Get list of files in archive */
 483         success = g_spawn_command_line_sync (comics_document->list_command,
 484                                              &std_out, NULL, &retval, error);
 485
 486         if (!success) {
 487                 return FALSE;
 488         } else if (!WIFEXITED(retval) || WEXITSTATUS(retval) != EXIT_SUCCESS) {
 489                 g_set_error_literal (error,
 490                                      EV_DOCUMENT_ERROR,
 491                                      EV_DOCUMENT_ERROR_INVALID,
 492                                      _("File corrupted"));
 493                 return FALSE;
 494         }
 495
 496         /* FIXME: is this safe against filenames containing \n in the archive ? */
 497         cb_files = g_strsplit (std_out, EV_EOL, 0);
 498
 499         g_free (std_out);
 500
 501         if (!cb_files) {
 502                 g_set_error_literal (error,
 503                                      EV_DOCUMENT_ERROR,
 504                                      EV_DOCUMENT_ERROR_INVALID,
 505                                      _("No files in archive"));
 506                 return FALSE;
 507         }
 508
 509         comics_document->page_names = g_ptr_array_sized_new (64);
 510
 511         supported_extensions = get_supported_image_extensions ();
 512         for (i = 0; cb_files[i] != NULL; i++) {
 513                 if (comics_document->offset != NO_OFFSET) {
 514                         if (g_utf8_strlen (cb_files[i],-1) >
 515                             comics_document->offset) {
 516                                 cb_file =
 517                                         g_utf8_offset_to_pointer (cb_files[i],
 518                                                        comics_document->offset);
 519                         } else {
 520                                 continue;
 521                         }
 522                 } else {
 523                         cb_file = cb_files[i];
 524                 }
 525                 gchar *suffix = g_strrstr (cb_file, ".");
 526                 if (!suffix)
 527                         continue;
 528                 suffix = g_ascii_strdown (suffix + 1, -1);
 529                 if (g_slist_find_custom (supported_extensions, suffix,
 530                                          (GCompareFunc) strcmp) != NULL) {
 531                         g_ptr_array_add (comics_document->page_names,
 532                                          g_strstrip (g_strdup (cb_file)));
 533                 }
 534                 g_free (suffix);
 535         }
 536         g_strfreev (cb_files);
 537         g_slist_foreach (supported_extensions, (GFunc) g_free, NULL);
 538         g_slist_free (supported_extensions);
 539
 540         if (comics_document->page_names->len == 0) {
 541                 g_set_error (error,
 542                              EV_DOCUMENT_ERROR,
 543                              EV_DOCUMENT_ERROR_INVALID,
 544                              _("No images found in archive %s"),
 545                              uri);
 546                 return FALSE;
 547         }
 548
 549         /* Now sort the pages */
 550         g_ptr_array_sort (comics_document->page_names, sort_page_names);
 551
 552         return TRUE;
 553 }
 554
 555
 556 static gboolean
 557 comics_document_save (EvDocument *document,
 558                       const char *uri,
 559                       GError    **error)
 560 {
 561         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 562
 563         return ev_xfer_uri_simple (comics_document->archive, uri, error);
 564 }
 565
 566 static int
 567 comics_document_get_n_pages (EvDocument *document)
 568 {
 569         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 570
 571         if (comics_document->page_names == NULL)
 572                 return 0;
 573
 574         return comics_document->page_names->len;
 575 }
 576
 577 static void
 578 comics_document_get_page_size (EvDocument *document,
 579                                EvPage     *page,
 580                                double     *width,
 581                                double     *height)
 582 {
 583         GdkPixbufLoader *loader;
 584         char **argv;
 585         guchar buf[1024];
 586         gboolean success, got_size = FALSE;
 587         gint outpipe = -1;
 588         GPid child_pid;
 589         gssize bytes;
 590         GdkPixbuf *pixbuf;
 591         gchar *filename;
 592         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 593
 594         if (!comics_document->decompress_tmp) {
 595                 argv = extract_argv (document, 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_if_fail (success == TRUE);
 604
 605                 loader = gdk_pixbuf_loader_new ();
 606                 g_signal_connect (loader, "area-prepared",
 607                                   G_CALLBACK (get_page_size_area_prepared_cb),
 608                                   &got_size);
 609
 610                 while (outpipe >= 0) {
 611                         bytes = read (outpipe, buf, 1024);
 612
 613                         if (bytes > 0)
 614                         gdk_pixbuf_loader_write (loader, buf, bytes, NULL);
 615                         if (bytes <= 0 || got_size) {
 616                                 close (outpipe);
 617                                 outpipe = -1;
 618                                 gdk_pixbuf_loader_close (loader, NULL);
 619                         }
 620                 }
 621
 622                 if (gdk_pixbuf_loader_get_pixbuf (loader)) {
 623                         pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
 624                         if (width)
 625                                 *width = gdk_pixbuf_get_width (pixbuf);
 626                         if (height)
 627                                 *height = gdk_pixbuf_get_height (pixbuf);
 628                 }
 629
 630                 g_spawn_close_pid (child_pid);
 631                 g_object_unref (loader);
 632         } else {
 633                 filename = g_build_filename (comics_document->dir,
 634                                              (char *) comics_document->page_names->pdata[page->index],
 635                                              NULL);
 636                 pixbuf = gdk_pixbuf_new_from_file (filename, NULL);
 637                 g_free (filename);
 638                 if (width)
 639                         *width = gdk_pixbuf_get_width (pixbuf);
 640                 if (height)
 641                         *height = gdk_pixbuf_get_height (pixbuf);
 642         }
 643 }
 644
 645 static void
 646 get_page_size_area_prepared_cb (GdkPixbufLoader *loader,
 647                                 gpointer         data)
 648 {
 649         gboolean *got_size = data;
 650         *got_size = TRUE;
 651 }
 652
 653 static GdkPixbuf *
 654 comics_document_render_pixbuf (EvDocument      *document,
 655                                EvRenderContext *rc)
 656 {
 657         GdkPixbufLoader *loader;
 658         GdkPixbuf *rotated_pixbuf;
 659         char **argv;
 660         guchar buf[4096];
 661         gboolean success;
 662         gint outpipe = -1;
 663         GPid child_pid;
 664         gssize bytes;
 665         gint width, height;
 666         gchar *filename;
 667         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 668
 669         if (!comics_document->decompress_tmp) {
 670                 argv = extract_argv (document, rc->page->index);
 671                 success = g_spawn_async_with_pipes (NULL, argv, NULL,
 672                                                     G_SPAWN_SEARCH_PATH |
 673                                                     G_SPAWN_STDERR_TO_DEV_NULL,
 674                                                     NULL, NULL,
 675                                                     &child_pid,
 676                                                     NULL, &outpipe, NULL, NULL);
 677                 g_strfreev (argv);
 678                 g_return_val_if_fail (success == TRUE, NULL);
 679
 680                 loader = gdk_pixbuf_loader_new ();
 681                 g_signal_connect (loader, "size-prepared",
 682                                   G_CALLBACK (render_pixbuf_size_prepared_cb),
 683                                   &rc->scale);
 684
 685                 while (outpipe >= 0) {
 686                         bytes = read (outpipe, buf, 4096);
 687
 688                         if (bytes > 0) {
 689                                 gdk_pixbuf_loader_write (loader, buf, bytes,
 690                                 NULL);
 691                         } else if (bytes <= 0) {
 692                                 close (outpipe);
 693                                 gdk_pixbuf_loader_close (loader, NULL);
 694                                 outpipe = -1;
 695                         }
 696                 }
 697
 698                 rotated_pixbuf = gdk_pixbuf_rotate_simple (
 699                                         gdk_pixbuf_loader_get_pixbuf (loader),
 700                                         360 - rc->rotation);
 701                 g_spawn_close_pid (child_pid);
 702                 g_object_unref (loader);
 703         } else {
 704                 filename =
 705                         g_build_filename (comics_document->dir,
 706                                           (char *) comics_document->page_names->pdata[rc->page->index],
 707                                           NULL);
 708
 709                 gdk_pixbuf_get_file_info (filename, &width, &height);
 710
 711                 rotated_pixbuf =
 712                   gdk_pixbuf_rotate_simple (gdk_pixbuf_new_from_file_at_size (
 713                                             filename, width * (rc->scale) + 0.5,
 714                                             height * (rc->scale) + 0.5, NULL),
 715                                             360 - rc->rotation);
 716                 g_free (filename);
 717
 718         }
 719         return rotated_pixbuf;
 720 }
 721
 722 static cairo_surface_t *
 723 comics_document_render (EvDocument      *document,
 724                         EvRenderContext *rc)
 725 {
 726         GdkPixbuf       *pixbuf;
 727         cairo_surface_t *surface;
 728
 729         pixbuf = comics_document_render_pixbuf (document, rc);
 730         surface = ev_document_misc_surface_from_pixbuf (pixbuf);
 731         g_object_unref (pixbuf);
 732
 733         return surface;
 734 }
 735
 736 static void
 737 render_pixbuf_size_prepared_cb (GdkPixbufLoader *loader,
 738                                 gint             width,
 739                                 gint             height,
 740                                 gpointer         data)
 741 {
 742         double *scale = data;
 743         int w = (width  * (*scale) + 0.5);
 744         int h = (height * (*scale) + 0.5);
 745
 746         gdk_pixbuf_loader_set_size (loader, w, h);
 747 }
 748
 749 /**
 750  * comics_remove_dir: Removes a directory recursively.
 751  * Returns:
 752  *      0 if it was successfully deleted,
 753  *      -1 if an error occurred
 754  */
 755 static int
 756 comics_remove_dir (gchar *path_name)
 757 {
 758         GDir  *content_dir;
 759         const gchar *filename;
 760         gchar *filename_with_path;
 761
 762         if (g_file_test (path_name, G_FILE_TEST_IS_DIR)) {
 763                 content_dir = g_dir_open  (path_name, 0, NULL);
 764                 filename  = g_dir_read_name (content_dir);
 765                 while (filename) {
 766                         filename_with_path =
 767                                 g_build_filename (path_name,
 768                                                   filename, NULL);
 769                         comics_remove_dir (filename_with_path);
 770                         g_free (filename_with_path);
 771                         filename = g_dir_read_name (content_dir);
 772                 }
 773                 g_dir_close (content_dir);
 774         }
 775         /* Note from g_remove() documentation: on Windows, it is in general not
 776          * possible to remove a file that is open to some process, or mapped
 777          * into memory.*/
 778         return (g_remove (path_name));
 779 }
 780
 781 static void
 782 comics_document_finalize (GObject *object)
 783 {
 784         ComicsDocument *comics_document = COMICS_DOCUMENT (object);
 785
 786         if (comics_document->decompress_tmp) {
 787                 if (comics_remove_dir (comics_document->dir) == -1)
 788                         g_warning (_("There was an error deleting “%s”."),
 789                                    comics_document->dir);
 790                 g_free (comics_document->dir);
 791         }
 792
 793         if (comics_document->page_names) {
 794                 g_ptr_array_foreach (comics_document->page_names, (GFunc) g_free, NULL);
 795                 g_ptr_array_free (comics_document->page_names, TRUE);
 796         }
 797
 798         g_free (comics_document->archive);
 799         g_free (comics_document->selected_command);
 800         g_free (comics_document->alternative_command);
 801         g_free (comics_document->extract_command);
 802         g_free (comics_document->list_command);
 803
 804         G_OBJECT_CLASS (comics_document_parent_class)->finalize (object);
 805 }
 806
 807 static void
 808 comics_document_class_init (ComicsDocumentClass *klass)
 809 {
 810         GObjectClass    *gobject_class = G_OBJECT_CLASS (klass);
 811         EvDocumentClass *ev_document_class = EV_DOCUMENT_CLASS (klass);
 812
 813         gobject_class->finalize = comics_document_finalize;
 814
 815         ev_document_class->load = comics_document_load;
 816         ev_document_class->save = comics_document_save;
 817         ev_document_class->get_n_pages = comics_document_get_n_pages;
 818         ev_document_class->get_page_size = comics_document_get_page_size;
 819         ev_document_class->render = comics_document_render;
 820 }
 821
 822 static void
 823 comics_document_init (ComicsDocument *comics_document)
 824 {
 825         comics_document->archive = NULL;
 826         comics_document->page_names = NULL;
 827         comics_document->extract_command = NULL;
 828 }
 829
 830 /* Returns a list of file extensions supported by gdk-pixbuf */
 831 static GSList*
 832 get_supported_image_extensions()
 833 {
 834         GSList *extensions = NULL;
 835         GSList *formats = gdk_pixbuf_get_formats ();
 836         GSList *l;
 837
 838         for (l = formats; l != NULL; l = l->next) {
 839                 int i;
 840                 gchar **ext = gdk_pixbuf_format_get_extensions (l->data);
 841
 842                 for (i = 0; ext[i] != NULL; i++) {
 843                         extensions = g_slist_append (extensions,
 844                                                      g_strdup (ext[i]));
 845                 }
 846
 847                 g_strfreev (ext);
 848         }
 849
 850         g_slist_free (formats);
 851         return extensions;
 852 }
 853
 854 static GdkPixbuf *
 855 comics_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document,
 856                                           EvRenderContext      *rc,
 857                                           gboolean              border)
 858 {
 859         GdkPixbuf *thumbnail;
 860
 861         thumbnail = comics_document_render_pixbuf (EV_DOCUMENT (document), rc);
 862
 863         if (border) {
 864               GdkPixbuf *tmp_pixbuf = thumbnail;
 865
 866               thumbnail = ev_document_misc_get_thumbnail_frame (-1, -1, tmp_pixbuf);
 867               g_object_unref (tmp_pixbuf);
 868         }
 869
 870         return thumbnail;
 871 }
 872
 873 static void
 874 comics_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 875                                            EvRenderContext      *rc,
 876                                            gint                 *width,
 877                                            gint                 *height)
 878 {
 879         gdouble page_width, page_height;
 880
 881         comics_document_get_page_size (EV_DOCUMENT (document), rc->page,
 882                                        &page_width, &page_height);
 883
 884         if (rc->rotation == 90 || rc->rotation == 270) {
 885                 *width = (gint) (page_height * rc->scale);
 886                 *height = (gint) (page_width * rc->scale);
 887         } else {
 888                 *width = (gint) (page_width * rc->scale);
 889                 *height = (gint) (page_height * rc->scale);
 890         }
 891 }
 892
 893 static void
 894 comics_document_document_thumbnails_iface_init (EvDocumentThumbnailsInterface *iface)
 895 {
 896         iface->get_thumbnail = comics_document_thumbnails_get_thumbnail;
 897         iface->get_dimensions = comics_document_thumbnails_get_dimensions;
 898 }
 899
 900 static char**
 901 extract_argv (EvDocument *document, gint page)
 902 {
 903         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 904         char **argv;
 905         char *command_line, *quoted_archive, *quoted_filename;
 906         GError *err = NULL;
 907
 908         if (page >= comics_document->page_names->len)
 909                 return NULL;
 910
 911         if (comics_document->regex_arg) {
 912                 quoted_archive = comics_regex_quote (comics_document->archive);
 913                 quoted_filename =
 914                         comics_regex_quote (comics_document->page_names->pdata[page]);
 915         } else {
 916                 quoted_archive = g_shell_quote (comics_document->archive);
 917                 quoted_filename = g_shell_quote (comics_document->page_names->pdata[page]);
 918         }
 919
 920         command_line = g_strdup_printf ("%s %s %s",
 921                                         comics_document->extract_command,
 922                                         quoted_archive,
 923                                         quoted_filename);
 924         g_shell_parse_argv (command_line, NULL, &argv, &err);
 925
 926         if (err) {
 927                 g_warning (_("Error %s"), err->message);
 928                 g_error_free (err);
 929                 return NULL;
 930         }
 931
 932         g_free (command_line);
 933         g_free (quoted_archive);
 934         g_free (quoted_filename);
 935         return argv;
 936 }