backend/comics/comics-document.c

   1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; c-indent-level: 8 -*- */
   2 /*
   3  * Copyright (C) 2005, Teemu Tervo <teemu.tervo@gmx.net>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2, or (at your option)
   8  * any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  */
  19
  20 #include <config.h>
  21
  22 #include <unistd.h>
  23 #include <string.h>
  24 #include <sys/wait.h>
  25 #include <stdlib.h>
  26 #include <errno.h>
  27
  28 #include <glib.h>
  29 #include <glib/gi18n-lib.h>
  30 #include <glib/gstdio.h>
  31 #include <gio/gio.h>
  32
  33 #include "comics-document.h"
  34 #include "ev-document-misc.h"
  35 #include "ev-document-thumbnails.h"
  36 #include "ev-file-helpers.h"
  37
  38 typedef enum
  39 {
  40         RARLABS,
  41         GNAUNRAR,
  42         UNZIP,
  43         P7ZIP,
  44         TAR
  45 } ComicBookDecompressType;
  46
  47 typedef struct _ComicsDocumentClass ComicsDocumentClass;
  48
  49 struct _ComicsDocumentClass
  50 {
  51         EvDocumentClass parent_class;
  52 };
  53
  54 struct _ComicsDocument
  55 {
  56         EvDocument parent_instance;
  57
  58         gchar    *archive, *dir;
  59         GPtrArray *page_names;
  60         gchar    *selected_command;
  61         gchar    *extract_command, *list_command, *decompress_tmp;
  62         gboolean regex_arg;
  63         gint     offset;
  64         ComicBookDecompressType command_usage;
  65 };
  66
  67 #define OFFSET_7Z 53
  68 #define NO_OFFSET 0
  69
  70 /* For perfomance reasons of 7z* we've choosen to decompress on the temporary
  71  * directory instead of decompressing on the stdout */
  72
  73 /**
  74  * @extract: command line arguments to pass to extract a file from the archive
  75  *   to stdout. The archive file and the file to extract will be appended after
  76  *   a "--".
  77  * @list: command line arguments to list the archive contents
  78  * @decompress_tmp: command line arguments to pass to extract the archive
  79  *   into a directory. The archive file and the directory to extract to will be
  80  *   appended after a "--".
  81  * @regex_arg: whether the command expects one filename or accepts a regex (glob?)
  82  * @offset: the byte offset of the filename on each line in the output of
  83  *   running the @list command
  84  */
  85 typedef struct {
  86         char *extract;
  87         char *list;
  88         char *decompress_tmp;
  89         gboolean regex_arg;
  90         gint offset;
  91 } ComicBookDecompressCommand;
  92
  93 static const ComicBookDecompressCommand command_usage_def[] = {
  94         /* RARLABS unrar */
  95         {"%s p -c- -ierr --", "%s vb -c- -- %s", NULL             , FALSE, NO_OFFSET},
  96
  97         /* GNA! unrar */
  98         {NULL               , "%s t %s"        , "%s -xf %s %s"   , TRUE , NO_OFFSET},
  99
 100         /* unzip */
 101         {"%s -p -C --"      , "%s -Z -1 -- %s" , NULL             , TRUE , NO_OFFSET},
 102
 103         /* 7zip */
 104         {NULL               , "%s l -- %s"     , "%s x -y %s -o%s", FALSE, OFFSET_7Z},
 105
 106         /* tar */
 107         {"%s -xOf"          , "%s -tf %s"      , NULL             , FALSE, NO_OFFSET}
 108 };
 109
 110 static void       comics_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface);
 111
 112 static GSList*    get_supported_image_extensions (void);
 113 static void       get_page_size_area_prepared_cb (GdkPixbufLoader *loader,
 114                                                   gpointer data);
 115 static void       render_pixbuf_size_prepared_cb (GdkPixbufLoader *loader,
 116                                                   gint width,
 117                                                   gint height,
 118                                                   gpointer data);
 119 static char**     extract_argv                   (EvDocument *document,
 120                                                   gint page);
 121
 122
 123 EV_BACKEND_REGISTER_WITH_CODE (ComicsDocument, comics_document,
 124         {
 125                 EV_BACKEND_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_THUMBNAILS,
 126                                                 comics_document_document_thumbnails_iface_init);
 127         } );
 128
 129 static char *
 130 comics_regex_quote (const char *s)
 131 {
 132     char *ret, *d;
 133
 134     d = ret = g_malloc (strlen (s) * 4 + 3);
 135
 136     *d++ = '\'';
 137
 138     for (; *s; s++, d++) {
 139         switch (*s) {
 140         case '?':
 141         case '|':
 142         case '[':
 143         case ']':
 144         case '*':
 145         case '\\':
 146             *d++ = '\\';
 147             break;
 148         case '\'':
 149             *d++ = '\'';
 150             *d++ = '\\';
 151             *d++ = '\'';
 152             break;
 153         }
 154         *d = *s;
 155     }
 156
 157     *d++ = '\'';
 158     *d = '\0';
 159
 160     return ret;
 161 }
 162
 163 /* This function manages the command for decompressing a comic book */
 164 static gboolean
 165 comics_decompress_temp_dir (const gchar *command_decompress_tmp,
 166                             const gchar *command,
 167                             GError      **error)
 168 {
 169         gboolean success;
 170         gchar *std_out, *basename;
 171         GError *err = NULL;
 172         gint retval;
 173
 174         success = g_spawn_command_line_sync (command_decompress_tmp, &std_out,
 175                                              NULL, &retval, &err);
 176         basename = g_path_get_basename (command);
 177         if (!success) {
 178                 g_set_error (error,
 179                              EV_DOCUMENT_ERROR,
 180                              EV_DOCUMENT_ERROR_INVALID,
 181                              _("Error launching the command “%s” in order to "
 182                              "decompress the comic book: %s"),
 183                              basename,
 184                              err->message);
 185                 g_error_free (err);
 186         } else if (WIFEXITED (retval)) {
 187                 if (WEXITSTATUS (retval) == EXIT_SUCCESS) {
 188                         g_free (std_out);
 189                         g_free (basename);
 190                         return TRUE;
 191                 } else {
 192                         g_set_error (error,
 193                                      EV_DOCUMENT_ERROR,
 194                                      EV_DOCUMENT_ERROR_INVALID,
 195                                      _("The command “%s” failed at "
 196                                      "decompressing the comic book."),
 197                                      basename);
 198                         g_free (std_out);
 199                 }
 200         } else {
 201                 g_set_error (error,
 202                              EV_DOCUMENT_ERROR,
 203                              EV_DOCUMENT_ERROR_INVALID,
 204                              _("The command “%s” did not end normally."),
 205                              basename);
 206                 g_free (std_out);
 207         }
 208         g_free (basename);
 209         return FALSE;
 210 }
 211
 212 /* This function shows how to use the choosen command for decompressing a
 213  * comic book file. It modifies fields of the ComicsDocument struct with
 214  * this information */
 215 static gboolean
 216 comics_generate_command_lines (ComicsDocument *comics_document,
 217                                GError         **error)
 218 {
 219         gchar *quoted_file;
 220         ComicBookDecompressType type;
 221
 222         type = comics_document->command_usage;
 223         quoted_file = g_shell_quote (comics_document->archive);
 224
 225         comics_document->extract_command =
 226                             g_strdup_printf (command_usage_def[type].extract,
 227                                              comics_document->selected_command);
 228         comics_document->list_command =
 229                             g_strdup_printf (command_usage_def[type].list,
 230                                              comics_document->selected_command,
 231                                              quoted_file);
 232         comics_document->regex_arg = command_usage_def[type].regex_arg;
 233         comics_document->offset = command_usage_def[type].offset;
 234         if (command_usage_def[type].decompress_tmp) {
 235                 comics_document->dir = ev_mkdtemp ("evince-comics-XXXXXX", error);
 236                 if (comics_document->dir == NULL)
 237                         return FALSE;
 238
 239                 /* unrar-free can't create directories, but ev_mkdtemp already created the dir */
 240
 241                 comics_document->decompress_tmp =
 242                         g_strdup_printf (command_usage_def[type].decompress_tmp,
 243                                          comics_document->selected_command,
 244                                          quoted_file,
 245                                          comics_document->dir);
 246                 g_free (quoted_file);
 247
 248                 if (!comics_decompress_temp_dir (comics_document->decompress_tmp,
 249                     comics_document->selected_command, error))
 250                         return FALSE;
 251                 else
 252                         return TRUE;
 253         } else {
 254                 g_free (quoted_file);
 255                 return TRUE;
 256         }
 257
 258 }
 259
 260 /* This function chooses an external command for decompressing a comic
 261  * book based on its mime tipe. */
 262 static gboolean
 263 comics_check_decompress_command (gchar          *mime_type,
 264                                  ComicsDocument *comics_document,
 265                                  GError         **error)
 266 {
 267         gboolean success;
 268         gchar *std_out, *std_err;
 269         gint retval;
 270         GError *err = NULL;
 271
 272         /* FIXME, use proper cbr/cbz mime types once they're
 273          * included in shared-mime-info */
 274
 275         if (!strcmp (mime_type, "application/x-cbr") ||
 276             !strcmp (mime_type, "application/x-rar")) {
 277                 /* The RARLAB provides a no-charge proprietary (freeware)
 278                 * decompress-only client for Linux called unrar. Another
 279                 * option is a GPLv2-licensed command-line tool developed by
 280                 * the Gna! project. Confusingly enough, the free software RAR
 281                 * decoder is also named unrar. For this reason we need to add
 282                 * some lines for disambiguation. Sorry for the added the
 283                 * complexity but it's life :)
 284                 * Finally, some distributions, like Debian, rename this free
 285                 * option as unrar-free.
 286                 * */
 287                 comics_document->selected_command =
 288                                         g_find_program_in_path ("unrar");
 289                 if (comics_document->selected_command) {
 290                         /* We only use std_err to avoid printing useless error
 291                          * messages on the terminal */
 292                         success =
 293                                 g_spawn_command_line_sync (
 294                                               comics_document->selected_command,
 295                                                            &std_out, &std_err,
 296                                                            &retval, &err);
 297                         if (!success) {
 298                                 g_propagate_error (error, err);
 299                                 g_error_free (err);
 300                                 return FALSE;
 301                         /* I don't check retval status because RARLAB unrar
 302                          * doesn't have a way to return 0 without involving an
 303                          * operation with a file*/
 304                         } else if (WIFEXITED (retval)) {
 305                                 if (g_strrstr (std_out,"freeware") != NULL)
 306                                         /* The RARLAB freeware client */
 307                                         comics_document->command_usage = RARLABS;
 308                                 else
 309                                         /* The Gna! free software client */
 310                                         comics_document->command_usage = GNAUNRAR;
 311
 312                                 g_free (std_out);
 313                                 g_free (std_err);
 314                                 return TRUE;
 315                         }
 316                 }
 317                 /* The Gna! free software client with Debian naming convention */
 318                 comics_document->selected_command =
 319                                 g_find_program_in_path ("unrar-free");
 320                 if (comics_document->selected_command) {
 321                         comics_document->command_usage = GNAUNRAR;
 322                         return TRUE;
 323                 }
 324
 325         } else if (!strcmp (mime_type, "application/x-cbz") ||
 326                    !strcmp (mime_type, "application/zip")) {
 327                 /* InfoZIP's unzip program */
 328                 comics_document->selected_command =
 329                                 g_find_program_in_path ("unzip");
 330                 if (comics_document->selected_command) {
 331                         comics_document->command_usage = UNZIP;
 332                         return TRUE;
 333                 }
 334
 335         } else if (!strcmp (mime_type, "application/x-cb7") ||
 336                    !strcmp (mime_type, "application/x-7z-compressed")) {
 337                 /* 7zr, 7za and 7z are the commands from the p7zip project able
 338                  * to decompress .7z files */
 339                         comics_document->selected_command =
 340                                 g_find_program_in_path ("7zr");
 341                         if (comics_document->selected_command) {
 342                                 comics_document->command_usage = P7ZIP;
 343                                 return TRUE;
 344                         }
 345                         comics_document->selected_command =
 346                                 g_find_program_in_path ("7za");
 347                         if (comics_document->selected_command) {
 348                                 comics_document->command_usage = P7ZIP;
 349                                 return TRUE;
 350                         }
 351                         comics_document->selected_command =
 352                                 g_find_program_in_path ("7z");
 353                         if (comics_document->selected_command) {
 354                                 comics_document->command_usage = P7ZIP;
 355                                 return TRUE;
 356                         }
 357         } else if (!strcmp (mime_type, "application/x-cbt") ||
 358                    !strcmp (mime_type, "application/x-tar")) {
 359                 /* tar utility (Tape ARchive) */
 360                 comics_document->selected_command =
 361                                 g_find_program_in_path ("tar");
 362                 if (comics_document->selected_command) {
 363                         comics_document->command_usage = TAR;
 364                         return TRUE;
 365                 }
 366         } else {
 367                 g_set_error (error,
 368                              EV_DOCUMENT_ERROR,
 369                              EV_DOCUMENT_ERROR_INVALID,
 370                              _("Not a comic book MIME type: %s"),
 371                              mime_type);
 372                              return FALSE;
 373         }
 374         g_set_error_literal (error,
 375                              EV_DOCUMENT_ERROR,
 376                              EV_DOCUMENT_ERROR_INVALID,
 377                              _("Can't find an appropriate command to "
 378                              "decompress this type of comic book"));
 379         return FALSE;
 380 }
 381
 382 static int
 383 sort_page_names (gconstpointer a,
 384                  gconstpointer b)
 385 {
 386   return strcmp (* (const char **) a, * (const char **) b);
 387 }
 388
 389 static gboolean
 390 comics_document_load (EvDocument *document,
 391                       const char *uri,
 392                       GError    **error)
 393 {
 394         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 395         GSList *supported_extensions;
 396         gchar *std_out;
 397         gchar *mime_type;
 398         gchar **cb_files, *cb_file;
 399         gboolean success;
 400         int i, retval;
 401         GError *err = NULL;
 402
 403         comics_document->archive = g_filename_from_uri (uri, NULL, error);
 404         if (!comics_document->archive)
 405                 return FALSE;
 406
 407         mime_type = ev_file_get_mime_type (uri, FALSE, &err);
 408         if (!mime_type) {
 409                 if (err) {
 410                         g_propagate_error (error, err);
 411                 } else {
 412                         g_set_error_literal (error,
 413                                              EV_DOCUMENT_ERROR,
 414                                              EV_DOCUMENT_ERROR_INVALID,
 415                                              _("Unknown MIME Type"));
 416                 }
 417
 418                 return FALSE;
 419         }
 420
 421         if (!comics_check_decompress_command (mime_type, comics_document,
 422         error)) {
 423                 g_free (mime_type);
 424                 return FALSE;
 425         } else if (!comics_generate_command_lines (comics_document, error)) {
 426                    g_free (mime_type);
 427                 return FALSE;
 428         }
 429
 430         g_free (mime_type);
 431
 432         /* Get list of files in archive */
 433         success = g_spawn_command_line_sync (comics_document->list_command,
 434                                              &std_out, NULL, &retval, error);
 435
 436         if (!success) {
 437                 return FALSE;
 438         } else if (!WIFEXITED(retval) || WEXITSTATUS(retval) != EXIT_SUCCESS) {
 439                 g_set_error_literal (error,
 440                                      EV_DOCUMENT_ERROR,
 441                                      EV_DOCUMENT_ERROR_INVALID,
 442                                      _("File corrupted"));
 443                 return FALSE;
 444         }
 445
 446         /* FIXME: is this safe against filenames containing \n in the archive ? */
 447         cb_files = g_strsplit (std_out, "\n", 0);
 448         g_free (std_out);
 449
 450         if (!cb_files) {
 451                 g_set_error_literal (error,
 452                                      EV_DOCUMENT_ERROR,
 453                                      EV_DOCUMENT_ERROR_INVALID,
 454                                      _("No files in archive"));
 455                 return FALSE;
 456         }
 457
 458         comics_document->page_names = g_ptr_array_sized_new (64);
 459
 460         supported_extensions = get_supported_image_extensions ();
 461         for (i = 0; cb_files[i] != NULL; i++) {
 462                 if (comics_document->offset != NO_OFFSET) {
 463                         if (g_utf8_strlen (cb_files[i],-1) >
 464                             comics_document->offset) {
 465                                 cb_file =
 466                                         g_utf8_offset_to_pointer (cb_files[i],
 467                                                        comics_document->offset);
 468                         } else {
 469                                 continue;
 470                         }
 471                 } else {
 472                         cb_file = cb_files[i];
 473                 }
 474                 gchar *suffix = g_strrstr (cb_file, ".");
 475                 if (!suffix)
 476                         continue;
 477                 suffix = g_ascii_strdown (suffix + 1, -1);
 478                 if (g_slist_find_custom (supported_extensions, suffix,
 479                                          (GCompareFunc) strcmp) != NULL) {
 480                         g_ptr_array_add (comics_document->page_names,
 481                                          g_strstrip (g_strdup (cb_file)));
 482                 }
 483                 g_free (suffix);
 484         }
 485         g_strfreev (cb_files);
 486         g_slist_foreach (supported_extensions, (GFunc) g_free, NULL);
 487         g_slist_free (supported_extensions);
 488
 489         if (comics_document->page_names->len == 0) {
 490                 g_set_error (error,
 491                              EV_DOCUMENT_ERROR,
 492                              EV_DOCUMENT_ERROR_INVALID,
 493                              _("No images found in archive %s"),
 494                              uri);
 495                 return FALSE;
 496         }
 497
 498         /* Now sort the pages */
 499         g_ptr_array_sort (comics_document->page_names, sort_page_names);
 500
 501         return TRUE;
 502 }
 503
 504
 505 static gboolean
 506 comics_document_save (EvDocument *document,
 507                       const char *uri,
 508                       GError    **error)
 509 {
 510         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 511
 512         return ev_xfer_uri_simple (comics_document->archive, uri, error);
 513 }
 514
 515 static int
 516 comics_document_get_n_pages (EvDocument *document)
 517 {
 518         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 519
 520         if (comics_document->page_names == NULL)
 521                 return 0;
 522
 523         return comics_document->page_names->len;
 524 }
 525
 526 static void
 527 comics_document_get_page_size (EvDocument *document,
 528                                EvPage     *page,
 529                                double     *width,
 530                                double     *height)
 531 {
 532         GdkPixbufLoader *loader;
 533         char **argv;
 534         guchar buf[1024];
 535         gboolean success, got_size = FALSE;
 536         gint outpipe = -1;
 537         GPid child_pid = -1;
 538         gssize bytes;
 539         GdkPixbuf *pixbuf;
 540         gchar *filename;
 541         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 542
 543         if (!comics_document->decompress_tmp) {
 544                 argv = extract_argv (document, page->index);
 545                 success = g_spawn_async_with_pipes (NULL, argv, NULL,
 546                                                     G_SPAWN_SEARCH_PATH |
 547                                                     G_SPAWN_STDERR_TO_DEV_NULL,
 548                                                     NULL, NULL,
 549                                                     &child_pid,
 550                                                     NULL, &outpipe, NULL, NULL);
 551                 g_strfreev (argv);
 552                 g_return_if_fail (success == TRUE);
 553
 554                 loader = gdk_pixbuf_loader_new ();
 555                 g_signal_connect (loader, "area-prepared",
 556                                   G_CALLBACK (get_page_size_area_prepared_cb),
 557                                   &got_size);
 558
 559                 while (outpipe >= 0) {
 560                         bytes = read (outpipe, buf, 1024);
 561
 562                         if (bytes > 0)
 563                         gdk_pixbuf_loader_write (loader, buf, bytes, NULL);
 564                         if (bytes <= 0 || got_size) {
 565                                 close (outpipe);
 566                                 outpipe = -1;
 567                                 gdk_pixbuf_loader_close (loader, NULL);
 568                         }
 569                 }
 570
 571                 if (gdk_pixbuf_loader_get_pixbuf (loader)) {
 572                         pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
 573                         if (width)
 574                                 *width = gdk_pixbuf_get_width (pixbuf);
 575                         if (height)
 576                                 *height = gdk_pixbuf_get_height (pixbuf);
 577                 }
 578
 579                 g_spawn_close_pid (child_pid);
 580                 g_object_unref (loader);
 581         } else {
 582                 filename = g_build_filename (comics_document->dir,
 583                                              (char *) comics_document->page_names->pdata[page->index],
 584                                              NULL);
 585                 pixbuf = gdk_pixbuf_new_from_file (filename, NULL);
 586                 g_free (filename);
 587                 if (width)
 588                         *width = gdk_pixbuf_get_width (pixbuf);
 589                 if (height)
 590                         *height = gdk_pixbuf_get_height (pixbuf);
 591         }
 592 }
 593
 594 static void
 595 get_page_size_area_prepared_cb (GdkPixbufLoader *loader,
 596                                 gpointer         data)
 597 {
 598         gboolean *got_size = data;
 599         *got_size = TRUE;
 600 }
 601
 602 static GdkPixbuf *
 603 comics_document_render_pixbuf (EvDocument      *document,
 604                                EvRenderContext *rc)
 605 {
 606         GdkPixbufLoader *loader;
 607         GdkPixbuf *rotated_pixbuf;
 608         char **argv;
 609         guchar buf[4096];
 610         gboolean success;
 611         gint outpipe = -1;
 612         GPid child_pid = -1;
 613         gssize bytes;
 614         gint width, height;
 615         gchar *filename;
 616         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 617
 618         if (!comics_document->decompress_tmp) {
 619                 argv = extract_argv (document, rc->page->index);
 620                 success = g_spawn_async_with_pipes (NULL, argv, NULL,
 621                                                     G_SPAWN_SEARCH_PATH |
 622                                                     G_SPAWN_STDERR_TO_DEV_NULL,
 623                                                     NULL, NULL,
 624                                                     &child_pid,
 625                                                     NULL, &outpipe, NULL, NULL);
 626                 g_strfreev (argv);
 627                 g_return_val_if_fail (success == TRUE, NULL);
 628
 629                 loader = gdk_pixbuf_loader_new ();
 630                 g_signal_connect (loader, "size-prepared",
 631                                   G_CALLBACK (render_pixbuf_size_prepared_cb),
 632                                   &rc->scale);
 633
 634                 while (outpipe >= 0) {
 635                         bytes = read (outpipe, buf, 4096);
 636
 637                         if (bytes > 0) {
 638                                 gdk_pixbuf_loader_write (loader, buf, bytes,
 639                                 NULL);
 640                         } else if (bytes <= 0) {
 641                                 close (outpipe);
 642                                 gdk_pixbuf_loader_close (loader, NULL);
 643                                 outpipe = -1;
 644                         }
 645                 }
 646
 647                 rotated_pixbuf = gdk_pixbuf_rotate_simple (
 648                                         gdk_pixbuf_loader_get_pixbuf (loader),
 649                                         360 - rc->rotation);
 650                 g_spawn_close_pid (child_pid);
 651                 g_object_unref (loader);
 652         } else {
 653                 filename =
 654                         g_build_filename (comics_document->dir,
 655                                           (char *) comics_document->page_names->pdata[rc->page->index],
 656                                           NULL);
 657
 658                 gdk_pixbuf_get_file_info (filename, &width, &height);
 659
 660                 rotated_pixbuf =
 661                   gdk_pixbuf_rotate_simple (gdk_pixbuf_new_from_file_at_size (
 662                                             filename, width * (rc->scale) + 0.5,
 663                                             height * (rc->scale) + 0.5, NULL),
 664                                             360 - rc->rotation);
 665                 g_free (filename);
 666
 667         }
 668         return rotated_pixbuf;
 669 }
 670
 671 static cairo_surface_t *
 672 comics_document_render (EvDocument      *document,
 673                         EvRenderContext *rc)
 674 {
 675         GdkPixbuf       *pixbuf;
 676         cairo_surface_t *surface;
 677
 678         pixbuf = comics_document_render_pixbuf (document, rc);
 679         surface = ev_document_misc_surface_from_pixbuf (pixbuf);
 680         g_object_unref (pixbuf);
 681
 682         return surface;
 683 }
 684
 685 static void
 686 render_pixbuf_size_prepared_cb (GdkPixbufLoader *loader,
 687                                 gint             width,
 688                                 gint             height,
 689                                 gpointer         data)
 690 {
 691         double *scale = data;
 692         int w = (width  * (*scale) + 0.5);
 693         int h = (height * (*scale) + 0.5);
 694
 695         gdk_pixbuf_loader_set_size (loader, w, h);
 696 }
 697
 698 /**
 699  * comics_remove_dir: Removes a directory recursively.
 700  * Returns:
 701  *      0 if it was successfully deleted,
 702  *      -1 if an error occurred
 703  */
 704 static int
 705 comics_remove_dir (gchar *path_name)
 706 {
 707         GDir  *content_dir;
 708         const gchar *filename;
 709         gchar *filename_with_path;
 710
 711         if (g_file_test (path_name, G_FILE_TEST_IS_DIR)) {
 712                 content_dir = g_dir_open  (path_name, 0, NULL);
 713                 filename  = g_dir_read_name (content_dir);
 714                 while (filename) {
 715                         filename_with_path =
 716                                 g_build_filename (path_name,
 717                                                   filename, NULL);
 718                         comics_remove_dir (filename_with_path);
 719                         g_free (filename_with_path);
 720                         filename = g_dir_read_name (content_dir);
 721                 }
 722                 g_dir_close (content_dir);
 723         }
 724         /* Note from g_remove() documentation: on Windows, it is in general not
 725          * possible to remove a file that is open to some process, or mapped
 726          * into memory.*/
 727         return (g_remove (path_name));
 728 }
 729
 730 static void
 731 comics_document_finalize (GObject *object)
 732 {
 733         ComicsDocument *comics_document = COMICS_DOCUMENT (object);
 734
 735         if (comics_document->decompress_tmp) {
 736                 if (comics_remove_dir (comics_document->dir) == -1)
 737                         g_warning (_("There was an error deleting “%s”."),
 738                                    comics_document->dir);
 739                 g_free (comics_document->dir);
 740         }
 741
 742         if (comics_document->page_names) {
 743                 g_ptr_array_foreach (comics_document->page_names, (GFunc) g_free, NULL);
 744                 g_ptr_array_free (comics_document->page_names, TRUE);
 745         }
 746
 747         g_free (comics_document->archive);
 748         g_free (comics_document->selected_command);
 749         g_free (comics_document->extract_command);
 750         g_free (comics_document->list_command);
 751
 752         G_OBJECT_CLASS (comics_document_parent_class)->finalize (object);
 753 }
 754
 755 static void
 756 comics_document_class_init (ComicsDocumentClass *klass)
 757 {
 758         GObjectClass    *gobject_class = G_OBJECT_CLASS (klass);
 759         EvDocumentClass *ev_document_class = EV_DOCUMENT_CLASS (klass);
 760
 761         gobject_class->finalize = comics_document_finalize;
 762
 763         ev_document_class->load = comics_document_load;
 764         ev_document_class->save = comics_document_save;
 765         ev_document_class->get_n_pages = comics_document_get_n_pages;
 766         ev_document_class->get_page_size = comics_document_get_page_size;
 767         ev_document_class->render = comics_document_render;
 768 }
 769
 770 static void
 771 comics_document_init (ComicsDocument *comics_document)
 772 {
 773         comics_document->archive = NULL;
 774         comics_document->page_names = NULL;
 775         comics_document->extract_command = NULL;
 776 }
 777
 778 /* Returns a list of file extensions supported by gdk-pixbuf */
 779 static GSList*
 780 get_supported_image_extensions()
 781 {
 782         GSList *extensions = NULL;
 783         GSList *formats = gdk_pixbuf_get_formats ();
 784         GSList *l;
 785
 786         for (l = formats; l != NULL; l = l->next) {
 787                 int i;
 788                 gchar **ext = gdk_pixbuf_format_get_extensions (l->data);
 789
 790                 for (i = 0; ext[i] != NULL; i++) {
 791                         extensions = g_slist_append (extensions,
 792                                                      g_strdup (ext[i]));
 793                 }
 794
 795                 g_strfreev (ext);
 796         }
 797
 798         g_slist_free (formats);
 799         return extensions;
 800 }
 801
 802 static GdkPixbuf *
 803 comics_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document,
 804                                           EvRenderContext      *rc,
 805                                           gboolean              border)
 806 {
 807         GdkPixbuf *thumbnail;
 808
 809         thumbnail = comics_document_render_pixbuf (EV_DOCUMENT (document), rc);
 810
 811         if (border) {
 812               GdkPixbuf *tmp_pixbuf = thumbnail;
 813
 814               thumbnail = ev_document_misc_get_thumbnail_frame (-1, -1, tmp_pixbuf);
 815               g_object_unref (tmp_pixbuf);
 816         }
 817
 818         return thumbnail;
 819 }
 820
 821 static void
 822 comics_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 823                                            EvRenderContext      *rc,
 824                                            gint                 *width,
 825                                            gint                 *height)
 826 {
 827         gdouble page_width, page_height;
 828
 829         comics_document_get_page_size (EV_DOCUMENT (document), rc->page,
 830                                        &page_width, &page_height);
 831
 832         if (rc->rotation == 90 || rc->rotation == 270) {
 833                 *width = (gint) (page_height * rc->scale);
 834                 *height = (gint) (page_width * rc->scale);
 835         } else {
 836                 *width = (gint) (page_width * rc->scale);
 837                 *height = (gint) (page_height * rc->scale);
 838         }
 839 }
 840
 841 static void
 842 comics_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
 843 {
 844         iface->get_thumbnail = comics_document_thumbnails_get_thumbnail;
 845         iface->get_dimensions = comics_document_thumbnails_get_dimensions;
 846 }
 847
 848 static char**
 849 extract_argv (EvDocument *document, gint page)
 850 {
 851         ComicsDocument *comics_document = COMICS_DOCUMENT (document);
 852         char **argv;
 853         char *command_line, *quoted_archive, *quoted_filename;
 854         GError *err = NULL;
 855
 856         if (page >= comics_document->page_names->len)
 857                 return NULL;
 858
 859         quoted_archive = g_shell_quote (comics_document->archive);
 860         if (comics_document->regex_arg) {
 861                 quoted_filename = comics_regex_quote (comics_document->page_names->pdata[page]);
 862         } else {
 863                 quoted_filename = g_shell_quote (comics_document->page_names->pdata[page]);
 864         }
 865
 866         command_line = g_strdup_printf ("%s %s %s",
 867                                         comics_document->extract_command,
 868                                         quoted_archive,
 869                                         quoted_filename);
 870         g_shell_parse_argv (command_line, NULL, &argv, &err);
 871
 872         if (err) {
 873                 g_warning (_("Error %s"), err->message);
 874                 g_error_free (err);
 875                 return NULL;
 876         }
 877
 878         g_free (command_line);
 879         g_free (quoted_archive);
 880         g_free (quoted_filename);
 881         return argv;
 882 }