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;
 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                 comics_document->list_command =
 265                            g_strdup_printf (command_usage_def[type].list,
 266                                             comics_document->alternative_command,
 267                                             comics_document->archive);
 268         } else {
 269                 quoted_file = g_shell_quote (comics_document->archive);
 270                 comics_document->list_command =
 271                                 g_strdup_printf (command_usage_def[type].list,
 272                                                  quoted_command, quoted_file);
 273         }
 274         comics_document->extract_command =
 275                             g_strdup_printf (command_usage_def[type].extract,
 276                                              quoted_command);
 277         comics_document->offset = command_usage_def[type].offset;
 278         if (command_usage_def[type].decompress_tmp) {
 279                 comics_document->dir = ev_mkdtemp ("evince-comics-XXXXXX", error);
 280                 if (comics_document->dir == NULL)
 281                         return FALSE;
 282
 283                 /* unrar-free can't create directories, but ev_mkdtemp already created the dir */
 284
 285                 comics_document->decompress_tmp =
 286                         g_strdup_printf (command_usage_def[type].decompress_tmp,
 287                                          quoted_command, quoted_file,
 288                                          comics_document->dir);
 289                 g_free (quoted_file);
 290                 g_free (quoted_command);
 291
 292                 if (!comics_decompress_temp_dir (comics_document->decompress_tmp,
 293                     comics_document->selected_command, error))
 294                         return FALSE;
 295                 else
 296                         return TRUE;
 297         } else {
 298                 g_free (quoted_file);
 299                 g_free (quoted_command);
 300                 return TRUE;
 301         }
 302
 303 }
 304
 305 /* This function chooses an external command for decompressing a comic
 306  * book based on its mime tipe. */
 307 static gboolean
 308 comics_check_decompress_command (gchar          *mime_type,
 309                                  ComicsDocument *comics_document,
 310                                  GError         **error)
 311 {
 312         gboolean success;
 313         gchar *std_out, *std_err;
 314         gint retval;
 315         GError *err = NULL;
 316
 317         /* FIXME, use proper cbr/cbz mime types once they're
 318          * included in shared-mime-info */
 319
 320         if (!strcmp (mime_type, "application/x-cbr") ||
 321             !strcmp (mime_type, "application/x-rar")) {
 322                 /* The RARLAB provides a no-charge proprietary (freeware)
 323                 * decompress-only client for Linux called unrar. Another
 324                 * option is a GPLv2-licensed command-line tool developed by
 325                 * the Gna! project. Confusingly enough, the free software RAR
 326                 * decoder is also named unrar. For this reason we need to add
 327                 * some lines for disambiguation. Sorry for the added the
 328                 * complexity but it's life :)
 329                 * Finally, some distributions, like Debian, rename this free
 330                 * option as unrar-free.
 331                 * */
 332                 comics_document->selected_command =
 333                                         g_find_program_in_path ("unrar");
 334                 if (comics_document->selected_command) {
 335                         /* We only use std_err to avoid printing useless error
 336                          * messages on the terminal */
 337                         success =
 338                                 g_spawn_command_line_sync (
 339                                               comics_document->selected_command,
 340                                                            &std_out, &std_err,
 341                                                            &retval, &err);
 342                         if (!success) {
 343                                 g_propagate_error (error, err);
 344                                 g_error_free (err);
 345                                 return FALSE;
 346                         /* I don't check retval status because RARLAB unrar
 347                          * doesn't have a way to return 0 without involving an
 348                          * operation with a file*/
 349                         } else if (WIFEXITED (retval)) {
 350                                 if (g_strrstr (std_out,"freeware") != NULL)
 351                                         /* The RARLAB freeware client */
 352                                         comics_document->command_usage = RARLABS;
 353                                 else
 354                                         /* The Gna! free software client */
 355                                         comics_document->command_usage = GNAUNRAR;
 356
 357                                 g_free (std_out);
 358                                 g_free (std_err);
 359                                 return TRUE;
 360                         }
 361                 }
 362                 /* The Gna! free software client with Debian naming convention */
 363                 comics_document->selected_command =
 364                                 g_find_program_in_path ("unrar-free");
 365                 if (comics_document->selected_command) {
 366                         comics_document->command_usage = GNAUNRAR;
 367                         return TRUE;
 368                 }
 369
 370         } else if (!strcmp (mime_type, "application/x-cbz") ||
 371                    !strcmp (mime_type, "application/zip")) {
 372                 /* InfoZIP's unzip program */
 373                 comics_document->selected_command =
 374                                 g_find_program_in_path ("unzip");
 375                 comics_document->alternative_command =
 376                                 g_find_program_in_path ("zipnote");
 377                 if (comics_document->selected_command &&
 378                     comics_document->alternative_command) {
 379                         comics_document->command_usage = UNZIP;
 380                         return TRUE;
 381                 }
 382
 383         } else if (!strcmp (mime_type, "application/x-cb7") ||
 384                    !strcmp (mime_type, "application/x-7z-compressed")) {
 385                 /* 7zr, 7za and 7z are the commands from the p7zip project able
 386                  * to decompress .7z files */
 387                         comics_document->selected_command =
 388                                 g_find_program_in_path ("7zr");
 389                         if (comics_document->selected_command) {
 390                                 comics_document->command_usage = P7ZIP;
 391                                 return TRUE;
 392                         }
 393                         comics_document->selected_command =
 394                                 g_find_program_in_path ("7za");
 395                         if (comics_document->selected_command) {
 396                                 comics_document->command_usage = P7ZIP;
 397                                 return TRUE;
 398                         }
 399                         comics_document->selected_command =
 400                                 g_find_program_in_path ("7z");
 401                         if (comics_document->selected_command) {
 402                                 comics_document->command_usage = P7ZIP;
 403                                 return TRUE;
 404                         }
 405         } else if (!strcmp (mime_type, "application/x-cbt") ||
 406                    !strcmp (mime_type, "application/x-tar")) {
 407                 /* tar utility (Tape ARchive) */
 408                 comics_document->selected_command =
 409                                 g_find_program_in_path ("tar");
 410                 if (comics_document->selected_command) {
 411                         comics_document->command_usage = TAR;
 412                         return TRUE;
 413                 }
 414         } else {
 415                 g_set_error (error,
 416                              EV_DOCUMENT_ERROR,
 417                              EV_DOCUMENT_ERROR_INVALID,
 418                              _("Not a comic book MIME type: %s"),
 419                              mime_type);
 420                              return FALSE;
 421         }
 422         g_set_error_literal (error,
 423                              EV_DOCUMENT_ERROR,
 424                              EV_DOCUMENT_ERROR_INVALID,
 425                              _("Can't find an appropriate command to "
 426                              "decompress this type of comic book"));
 427         return FALSE;
 428 }
 429
 430 static int
 431 sort_page_names (gconstpointer a,
 432                  gconstpointer b)
 433 {
 434   return strcmp (* (const char **) a, * (const char **) b);
 435 }
 436
 437 static gboolean
 438 comics_document_load (EvDocument *document,
 439                       const char *uri,
 440                       GError    **error)
 441 {
 442         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 443         GSList *supported_extensions;
 444         gchar *std_out;
 445         gchar *mime_type;
 446         gchar **cb_files, *cb_file;
 447         gboolean success;
 448         int i, retval;
 449         GError *err = NULL;
 450
 451         comics_document->archive = g_filename_from_uri (uri, NULL, error);
 452         if (!comics_document->archive)
 453                 return FALSE;
 454
 455         mime_type = ev_file_get_mime_type (uri, FALSE, &err);
 456         if (!mime_type) {
 457                 if (err) {
 458                         g_propagate_error (error, err);
 459                 } else {
 460                         g_set_error_literal (error,
 461                                              EV_DOCUMENT_ERROR,
 462                                              EV_DOCUMENT_ERROR_INVALID,
 463                                              _("Unknown MIME Type"));
 464                 }
 465
 466                 return FALSE;
 467         }
 468
 469         if (!comics_check_decompress_command (mime_type, comics_document,
 470         error)) {
 471                 g_free (mime_type);
 472                 return FALSE;
 473         } else if (!comics_generate_command_lines (comics_document, error)) {
 474                    g_free (mime_type);
 475                 return FALSE;
 476         }
 477
 478         g_free (mime_type);
 479
 480         /* Get list of files in archive */
 481         success = g_spawn_command_line_sync (comics_document->list_command,
 482                                              &std_out, NULL, &retval, error);
 483
 484         if (!success) {
 485                 return FALSE;
 486         } else if (!WIFEXITED(retval) || WEXITSTATUS(retval) != EXIT_SUCCESS) {
 487                 g_set_error_literal (error,
 488                                      EV_DOCUMENT_ERROR,
 489                                      EV_DOCUMENT_ERROR_INVALID,
 490                                      _("File corrupted"));
 491                 return FALSE;
 492         }
 493
 494         /* FIXME: is this safe against filenames containing \n in the archive ? */
 495         cb_files = g_strsplit (std_out, EV_EOL, 0);
 496
 497         g_free (std_out);
 498
 499         if (!cb_files) {
 500                 g_set_error_literal (error,
 501                                      EV_DOCUMENT_ERROR,
 502                                      EV_DOCUMENT_ERROR_INVALID,
 503                                      _("No files in archive"));
 504                 return FALSE;
 505         }
 506
 507         comics_document->page_names = g_ptr_array_sized_new (64);
 508
 509         supported_extensions = get_supported_image_extensions ();
 510         for (i = 0; cb_files[i] != NULL; i++) {
 511                 if (comics_document->offset != NO_OFFSET) {
 512                         if (g_utf8_strlen (cb_files[i],-1) >
 513                             comics_document->offset) {
 514                                 cb_file =
 515                                         g_utf8_offset_to_pointer (cb_files[i],
 516                                                        comics_document->offset);
 517                         } else {
 518                                 continue;
 519                         }
 520                 } else {
 521                         cb_file = cb_files[i];
 522                 }
 523                 gchar *suffix = g_strrstr (cb_file, ".");
 524                 if (!suffix)
 525                         continue;
 526                 suffix = g_ascii_strdown (suffix + 1, -1);
 527                 if (g_slist_find_custom (supported_extensions, suffix,
 528                                          (GCompareFunc) strcmp) != NULL) {
 529                         g_ptr_array_add (comics_document->page_names,
 530                                          g_strstrip (g_strdup (cb_file)));
 531                 }
 532                 g_free (suffix);
 533         }
 534         g_strfreev (cb_files);
 535         g_slist_foreach (supported_extensions, (GFunc) g_free, NULL);
 536         g_slist_free (supported_extensions);
 537
 538         if (comics_document->page_names->len == 0) {
 539                 g_set_error (error,
 540                              EV_DOCUMENT_ERROR,
 541                              EV_DOCUMENT_ERROR_INVALID,
 542                              _("No images found in archive %s"),
 543                              uri);
 544                 return FALSE;
 545         }
 546
 547         /* Now sort the pages */
 548         g_ptr_array_sort (comics_document->page_names, sort_page_names);
 549
 550         return TRUE;
 551 }
 552
 553
 554 static gboolean
 555 comics_document_save (EvDocument *document,
 556                       const char *uri,
 557                       GError    **error)
 558 {
 559         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 560
 561         return ev_xfer_uri_simple (comics_document->archive, uri, error);
 562 }
 563
 564 static int
 565 comics_document_get_n_pages (EvDocument *document)
 566 {
 567         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 568
 569         if (comics_document->page_names == NULL)
 570                 return 0;
 571
 572         return comics_document->page_names->len;
 573 }
 574
 575 static void
 576 comics_document_get_page_size (EvDocument *document,
 577                                EvPage     *page,
 578                                double     *width,
 579                                double     *height)
 580 {
 581         GdkPixbufLoader *loader;
 582         char **argv;
 583         guchar buf[1024];
 584         gboolean success, got_size = FALSE;
 585         gint outpipe = -1;
 586         GPid child_pid;
 587         gssize bytes;
 588         GdkPixbuf *pixbuf;
 589         gchar *filename;
 590         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 591
 592         if (!comics_document->decompress_tmp) {
 593                 argv = extract_argv (document, page->index);
 594                 success = g_spawn_async_with_pipes (NULL, argv, NULL,
 595                                                     G_SPAWN_SEARCH_PATH |
 596                                                     G_SPAWN_STDERR_TO_DEV_NULL,
 597                                                     NULL, NULL,
 598                                                     &child_pid,
 599                                                     NULL, &outpipe, NULL, NULL);
 600                 g_strfreev (argv);
 601                 g_return_if_fail (success == TRUE);
 602
 603                 loader = gdk_pixbuf_loader_new ();
 604                 g_signal_connect (loader, "area-prepared",
 605                                   G_CALLBACK (get_page_size_area_prepared_cb),
 606                                   &got_size);
 607
 608                 while (outpipe >= 0) {
 609                         bytes = read (outpipe, buf, 1024);
 610
 611                         if (bytes > 0)
 612                         gdk_pixbuf_loader_write (loader, buf, bytes, NULL);
 613                         if (bytes <= 0 || got_size) {
 614                                 close (outpipe);
 615                                 outpipe = -1;
 616                                 gdk_pixbuf_loader_close (loader, NULL);
 617                         }
 618                 }
 619
 620                 if (gdk_pixbuf_loader_get_pixbuf (loader)) {
 621                         pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
 622                         if (width)
 623                                 *width = gdk_pixbuf_get_width (pixbuf);
 624                         if (height)
 625                                 *height = gdk_pixbuf_get_height (pixbuf);
 626                 }
 627
 628                 g_spawn_close_pid (child_pid);
 629                 g_object_unref (loader);
 630         } else {
 631                 filename = g_build_filename (comics_document->dir,
 632                                              (char *) comics_document->page_names->pdata[page->index],
 633                                              NULL);
 634                 pixbuf = gdk_pixbuf_new_from_file (filename, NULL);
 635                 g_free (filename);
 636                 if (width)
 637                         *width = gdk_pixbuf_get_width (pixbuf);
 638                 if (height)
 639                         *height = gdk_pixbuf_get_height (pixbuf);
 640         }
 641 }
 642
 643 static void
 644 get_page_size_area_prepared_cb (GdkPixbufLoader *loader,
 645                                 gpointer         data)
 646 {
 647         gboolean *got_size = data;
 648         *got_size = TRUE;
 649 }
 650
 651 static GdkPixbuf *
 652 comics_document_render_pixbuf (EvDocument      *document,
 653                                EvRenderContext *rc)
 654 {
 655         GdkPixbufLoader *loader;
 656         GdkPixbuf *rotated_pixbuf;
 657         char **argv;
 658         guchar buf[4096];
 659         gboolean success;
 660         gint outpipe = -1;
 661         GPid child_pid;
 662         gssize bytes;
 663         gint width, height;
 664         gchar *filename;
 665         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 666
 667         if (!comics_document->decompress_tmp) {
 668                 argv = extract_argv (document, rc->page->index);
 669                 success = g_spawn_async_with_pipes (NULL, argv, NULL,
 670                                                     G_SPAWN_SEARCH_PATH |
 671                                                     G_SPAWN_STDERR_TO_DEV_NULL,
 672                                                     NULL, NULL,
 673                                                     &child_pid,
 674                                                     NULL, &outpipe, NULL, NULL);
 675                 g_strfreev (argv);
 676                 g_return_val_if_fail (success == TRUE, NULL);
 677
 678                 loader = gdk_pixbuf_loader_new ();
 679                 g_signal_connect (loader, "size-prepared",
 680                                   G_CALLBACK (render_pixbuf_size_prepared_cb),
 681                                   &rc->scale);
 682
 683                 while (outpipe >= 0) {
 684                         bytes = read (outpipe, buf, 4096);
 685
 686                         if (bytes > 0) {
 687                                 gdk_pixbuf_loader_write (loader, buf, bytes,
 688                                 NULL);
 689                         } else if (bytes <= 0) {
 690                                 close (outpipe);
 691                                 gdk_pixbuf_loader_close (loader, NULL);
 692                                 outpipe = -1;
 693                         }
 694                 }
 695
 696                 rotated_pixbuf = gdk_pixbuf_rotate_simple (
 697                                         gdk_pixbuf_loader_get_pixbuf (loader),
 698                                         360 - rc->rotation);
 699                 g_spawn_close_pid (child_pid);
 700                 g_object_unref (loader);
 701         } else {
 702                 filename =
 703                         g_build_filename (comics_document->dir,
 704                                           (char *) comics_document->page_names->pdata[rc->page->index],
 705                                           NULL);
 706
 707                 gdk_pixbuf_get_file_info (filename, &width, &height);
 708
 709                 rotated_pixbuf =
 710                   gdk_pixbuf_rotate_simple (gdk_pixbuf_new_from_file_at_size (
 711                                             filename, width * (rc->scale) + 0.5,
 712                                             height * (rc->scale) + 0.5, NULL),
 713                                             360 - rc->rotation);
 714                 g_free (filename);
 715
 716         }
 717         return rotated_pixbuf;
 718 }
 719
 720 static cairo_surface_t *
 721 comics_document_render (EvDocument      *document,
 722                         EvRenderContext *rc)
 723 {
 724         GdkPixbuf       *pixbuf;
 725         cairo_surface_t *surface;
 726
 727         pixbuf = comics_document_render_pixbuf (document, rc);
 728         surface = ev_document_misc_surface_from_pixbuf (pixbuf);
 729         g_object_unref (pixbuf);
 730
 731         return surface;
 732 }
 733
 734 static void
 735 render_pixbuf_size_prepared_cb (GdkPixbufLoader *loader,
 736                                 gint             width,
 737                                 gint             height,
 738                                 gpointer         data)
 739 {
 740         double *scale = data;
 741         int w = (width  * (*scale) + 0.5);
 742         int h = (height * (*scale) + 0.5);
 743
 744         gdk_pixbuf_loader_set_size (loader, w, h);
 745 }
 746
 747 /**
 748  * comics_remove_dir: Removes a directory recursively.
 749  * Returns:
 750  *      0 if it was successfully deleted,
 751  *      -1 if an error occurred
 752  */
 753 static int
 754 comics_remove_dir (gchar *path_name)
 755 {
 756         GDir  *content_dir;
 757         const gchar *filename;
 758         gchar *filename_with_path;
 759
 760         if (g_file_test (path_name, G_FILE_TEST_IS_DIR)) {
 761                 content_dir = g_dir_open  (path_name, 0, NULL);
 762                 filename  = g_dir_read_name (content_dir);
 763                 while (filename) {
 764                         filename_with_path =
 765                                 g_build_filename (path_name,
 766                                                   filename, NULL);
 767                         comics_remove_dir (filename_with_path);
 768                         g_free (filename_with_path);
 769                         filename = g_dir_read_name (content_dir);
 770                 }
 771                 g_dir_close (content_dir);
 772         }
 773         /* Note from g_remove() documentation: on Windows, it is in general not
 774          * possible to remove a file that is open to some process, or mapped
 775          * into memory.*/
 776         return (g_remove (path_name));
 777 }
 778
 779 static void
 780 comics_document_finalize (GObject *object)
 781 {
 782         ComicsDocument *comics_document = COMICS_DOCUMENT (object);
 783
 784         if (comics_document->decompress_tmp) {
 785                 if (comics_remove_dir (comics_document->dir) == -1)
 786                         g_warning (_("There was an error deleting “%s”."),
 787                                    comics_document->dir);
 788                 g_free (comics_document->dir);
 789         }
 790
 791         if (comics_document->page_names) {
 792                 g_ptr_array_foreach (comics_document->page_names, (GFunc) g_free, NULL);
 793                 g_ptr_array_free (comics_document->page_names, TRUE);
 794         }
 795
 796         g_free (comics_document->archive);
 797         g_free (comics_document->selected_command);
 798         g_free (comics_document->alternative_command);
 799         g_free (comics_document->extract_command);
 800         g_free (comics_document->list_command);
 801
 802         G_OBJECT_CLASS (comics_document_parent_class)->finalize (object);
 803 }
 804
 805 static void
 806 comics_document_class_init (ComicsDocumentClass *klass)
 807 {
 808         GObjectClass    *gobject_class = G_OBJECT_CLASS (klass);
 809         EvDocumentClass *ev_document_class = EV_DOCUMENT_CLASS (klass);
 810
 811         gobject_class->finalize = comics_document_finalize;
 812
 813         ev_document_class->load = comics_document_load;
 814         ev_document_class->save = comics_document_save;
 815         ev_document_class->get_n_pages = comics_document_get_n_pages;
 816         ev_document_class->get_page_size = comics_document_get_page_size;
 817         ev_document_class->render = comics_document_render;
 818 }
 819
 820 static void
 821 comics_document_init (ComicsDocument *comics_document)
 822 {
 823         comics_document->archive = NULL;
 824         comics_document->page_names = NULL;
 825         comics_document->extract_command = NULL;
 826 }
 827
 828 /* Returns a list of file extensions supported by gdk-pixbuf */
 829 static GSList*
 830 get_supported_image_extensions()
 831 {
 832         GSList *extensions = NULL;
 833         GSList *formats = gdk_pixbuf_get_formats ();
 834         GSList *l;
 835
 836         for (l = formats; l != NULL; l = l->next) {
 837                 int i;
 838                 gchar **ext = gdk_pixbuf_format_get_extensions (l->data);
 839
 840                 for (i = 0; ext[i] != NULL; i++) {
 841                         extensions = g_slist_append (extensions,
 842                                                      g_strdup (ext[i]));
 843                 }
 844
 845                 g_strfreev (ext);
 846         }
 847
 848         g_slist_free (formats);
 849         return extensions;
 850 }
 851
 852 static GdkPixbuf *
 853 comics_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document,
 854                                           EvRenderContext      *rc,
 855                                           gboolean              border)
 856 {
 857         GdkPixbuf *thumbnail;
 858
 859         thumbnail = comics_document_render_pixbuf (EV_DOCUMENT (document), rc);
 860
 861         if (border) {
 862               GdkPixbuf *tmp_pixbuf = thumbnail;
 863
 864               thumbnail = ev_document_misc_get_thumbnail_frame (-1, -1, tmp_pixbuf);
 865               g_object_unref (tmp_pixbuf);
 866         }
 867
 868         return thumbnail;
 869 }
 870
 871 static void
 872 comics_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 873                                            EvRenderContext      *rc,
 874                                            gint                 *width,
 875                                            gint                 *height)
 876 {
 877         gdouble page_width, page_height;
 878
 879         comics_document_get_page_size (EV_DOCUMENT (document), rc->page,
 880                                        &page_width, &page_height);
 881
 882         if (rc->rotation == 90 || rc->rotation == 270) {
 883                 *width = (gint) (page_height * rc->scale);
 884                 *height = (gint) (page_width * rc->scale);
 885         } else {
 886                 *width = (gint) (page_width * rc->scale);
 887                 *height = (gint) (page_height * rc->scale);
 888         }
 889 }
 890
 891 static void
 892 comics_document_document_thumbnails_iface_init (EvDocumentThumbnailsInterface *iface)
 893 {
 894         iface->get_thumbnail = comics_document_thumbnails_get_thumbnail;
 895         iface->get_dimensions = comics_document_thumbnails_get_dimensions;
 896 }
 897
 898 static char**
 899 extract_argv (EvDocument *document, gint page)
 900 {
 901         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 902         char **argv;
 903         char *command_line, *quoted_archive, *quoted_filename;
 904         GError *err = NULL;
 905
 906         if (page >= comics_document->page_names->len)
 907                 return NULL;
 908
 909         if (comics_document->regex_arg) {
 910                 quoted_archive = comics_regex_quote (comics_document->archive);
 911                 quoted_filename =
 912                         comics_regex_quote (comics_document->page_names->pdata[page]);
 913         } else {
 914                 quoted_archive = g_shell_quote (comics_document->archive);
 915                 quoted_filename = g_shell_quote (comics_document->page_names->pdata[page]);
 916         }
 917
 918         command_line = g_strdup_printf ("%s %s %s",
 919                                         comics_document->extract_command,
 920                                         quoted_archive,
 921                                         quoted_filename);
 922         g_shell_parse_argv (command_line, NULL, &argv, &err);
 923
 924         if (err) {
 925                 g_warning (_("Error %s"), err->message);
 926                 g_error_free (err);
 927                 return NULL;
 928         }
 929
 930         g_free (command_line);
 931         g_free (quoted_archive);
 932         g_free (quoted_filename);
 933         return argv;
 934 }