inicial

1 files changed, 936 insertions, 0 deletions

diff --git a/backend/comics/comics-document.c b/backend/comics/comics-document.c
new file mode 100644
index 00000000..4d74385a
--- /dev/null
+++ b/backend/comics/comics-document.c
@@ -0,0 +1,936 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; c-indent-level: 8 -*- */
+/*
+ * Copyright (C) 2009-2010 Juanjo Marín <[email protected]>
+ * Copyright (C) 2005, Teemu Tervo <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <config.h>
+
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+
+#include <glib.h>
+#include <glib/gi18n-lib.h>
+#include <glib/gstdio.h>
+#include <gio/gio.h>
+
+#ifdef G_OS_WIN32
+# define WIFEXITED(x) ((x) != 3)
+# define WEXITSTATUS(x) (x)
+#else
+# include <sys/wait.h>
+#endif
+
+#include "comics-document.h"
+#include "ev-document-misc.h"
+#include "ev-document-thumbnails.h"
+#include "ev-file-helpers.h"
+
+#ifdef G_OS_WIN32
+/* On windows g_spawn_command_line_sync reads stdout in O_BINARY mode, not in O_TEXT mode.
+ * As a consequence, newlines are in a platform dependent representation (\r\n). This
+ * might be considered a bug in glib.
+ */
+#define EV_EOL "\r\n"
+#else
+#define EV_EOL "\n"
+#endif
+
+typedef enum
+{
+	RARLABS,
+	GNAUNRAR,
+	UNZIP,
+	P7ZIP,
+	TAR
+} ComicBookDecompressType;
+
+typedef struct _ComicsDocumentClass ComicsDocumentClass;
+
+struct _ComicsDocumentClass
+{
+	EvDocumentClass parent_class;
+};
+
+struct _ComicsDocument
+{
+	EvDocument parent_instance;
+
+	gchar    *archive, *dir;
+	GPtrArray *page_names;
+	gchar    *selected_command, *alternative_command;
+	gchar    *extract_command, *list_command, *decompress_tmp;
+	gboolean regex_arg;
+	gint     offset;
+	ComicBookDecompressType command_usage;
+};
+
+#define OFFSET_7Z 53
+#define OFFSET_ZIP 2
+#define NO_OFFSET 0
+
+/* For perfomance reasons of 7z* we've choosen to decompress on the temporary 
+ * directory instead of decompressing on the stdout */
+
+/**
+ * @extract: command line arguments to pass to extract a file from the archive
+ *   to stdout.
+ * @list: command line arguments to list the archive contents
+ * @decompress_tmp: command line arguments to pass to extract the archive
+ *   into a directory.
+ * @regex_arg: whether the command can accept regex expressions
+ * @offset: the position offset of the filename on each line in the output of
+ *   running the @list command
+ */
+typedef struct {
+        char *extract;
+        char *list;
+        char *decompress_tmp;
+        gboolean regex_arg;
+        gint offset;
+} ComicBookDecompressCommand;
+
+static const ComicBookDecompressCommand command_usage_def[] = {
+        /* RARLABS unrar */
+	{"%s p -c- -ierr --", "%s vb -c- -- %s", NULL             , FALSE, NO_OFFSET},
+
+        /* GNA! unrar */
+	{NULL               , "%s t %s"        , "%s -xf %s %s"   , FALSE, NO_OFFSET},
+
+        /* unzip */
+	{"%s -p -C --"      , "%s %s"          , NULL             , TRUE , OFFSET_ZIP},
+
+        /* 7zip */
+	{NULL               , "%s l -- %s"     , "%s x -y %s -o%s", FALSE, OFFSET_7Z},
+
+        /* tar */
+	{"%s -xOf"          , "%s -tf %s"      , NULL             , FALSE, NO_OFFSET}
+};
+
+static void       comics_document_document_thumbnails_iface_init (EvDocumentThumbnailsInterface *iface);
+
+static GSList*    get_supported_image_extensions (void);
+static void       get_page_size_area_prepared_cb (GdkPixbufLoader *loader,
+						  gpointer data);
+static void       render_pixbuf_size_prepared_cb (GdkPixbufLoader *loader,
+						  gint width,
+						  gint height,
+						  gpointer data);
+static char**     extract_argv                   (EvDocument *document,
+						  gint page);
+
+
+EV_BACKEND_REGISTER_WITH_CODE (ComicsDocument, comics_document,
+	{
+		EV_BACKEND_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_THUMBNAILS,
+						comics_document_document_thumbnails_iface_init);
+	} );
+
+/**
+ * comics_regex_quote:
+ * @unquoted_string: a literal string
+ *
+ * Quotes a string so unzip will not interpret the regex expressions of
+ * @unquoted_string. Basically, this functions uses [] to disable regex 
+ * expressions. The return value must be freed with * g_free()
+ *
+ * Return value: quoted and disabled-regex string
+ **/
+static gchar *
+comics_regex_quote (const gchar *unquoted_string)
+{
+	const gchar *p;
+	GString *dest;
+
+	dest = g_string_new ("'");
+
+	p = unquoted_string;
+
+	while (*p) {
+		switch (*p) {
+			/* * matches a sequence of 0 or more characters */
+			case ('*'):
+			/* ? matches exactly 1 charactere */
+			case ('?'):
+			/* [...]  matches any single character found inside
+			 * the brackets. Disabling the first bracket is enough.
+			 */
+			case ('['):
+				g_string_append (dest, "[");
+				g_string_append_c (dest, *p);
+				g_string_append (dest, "]");
+				break;
+			/* Because \ escapes regex expressions that we are
+			 * disabling for unzip, we need to disable \ too */
+			case ('\\'):
+				g_string_append (dest, "[\\\\]");
+				break;
+			/* Escape single quote inside the string */
+			case ('\''):
+				g_string_append (dest, "'\\''");
+				break;
+			default:
+				g_string_append_c (dest, *p);
+				break;
+		}
+		++p;
+	}
+	g_string_append_c (dest, '\'');
+	return g_string_free (dest, FALSE);
+}
+
+
+/* This function manages the command for decompressing a comic book */
+static gboolean 
+comics_decompress_temp_dir (const gchar *command_decompress_tmp,
+			    const gchar *command, 
+			    GError      **error)
+{
+	gboolean success;
+	gchar *std_out, *basename;
+	GError *err = NULL;
+	gint retval;
+	
+	success = g_spawn_command_line_sync (command_decompress_tmp, &std_out, 
+					     NULL, &retval, &err);
+	basename = g_path_get_basename (command);
+	if (!success) {
+		g_set_error (error,
+			     EV_DOCUMENT_ERROR, 
+			     EV_DOCUMENT_ERROR_INVALID,
+			     _("Error launching the command “%s” in order to "
+			     "decompress the comic book: %s"),
+			     basename,
+			     err->message);
+		g_error_free (err);
+	} else if (WIFEXITED (retval)) {
+		if (WEXITSTATUS (retval) == EXIT_SUCCESS) {
+			g_free (std_out);
+			g_free (basename);
+			return TRUE;
+		} else {
+			g_set_error (error,
+				     EV_DOCUMENT_ERROR,
+				     EV_DOCUMENT_ERROR_INVALID,
+				     _("The command “%s” failed at "
+				     "decompressing the comic book."),
+				     basename);
+			g_free (std_out);
+		}
+	} else {
+		g_set_error (error,
+			     EV_DOCUMENT_ERROR,
+			     EV_DOCUMENT_ERROR_INVALID,
+			     _("The command “%s” did not end normally."),
+			     basename);
+		g_free (std_out);
+	}
+	g_free (basename);
+	return FALSE;
+}
+
+/* This function shows how to use the choosen command for decompressing a
+ * comic book file. It modifies fields of the ComicsDocument struct with 
+ * this information */
+static gboolean 
+comics_generate_command_lines (ComicsDocument *comics_document, 
+			       GError         **error)
+{
+	gchar *quoted_file, *quoted_file_aux;
+	gchar *quoted_command;
+	ComicBookDecompressType type;
+	
+	type = comics_document->command_usage;
+	comics_document->regex_arg = command_usage_def[type].regex_arg;
+	quoted_command = g_shell_quote (comics_document->selected_command);
+	if (comics_document->regex_arg) {
+		quoted_file = comics_regex_quote (comics_document->archive);
+		quoted_file_aux = g_shell_quote (comics_document->archive);
+		comics_document->list_command =
+			   g_strdup_printf (command_usage_def[type].list,
+			                    comics_document->alternative_command,
+			                    quoted_file_aux);
+		g_free (quoted_file_aux);
+	} else {
+		quoted_file = g_shell_quote (comics_document->archive);
+		comics_document->list_command =
+				g_strdup_printf (command_usage_def[type].list,
+				                 quoted_command, quoted_file);
+	}
+	comics_document->extract_command =
+			    g_strdup_printf (command_usage_def[type].extract,
+				             quoted_command);
+	comics_document->offset = command_usage_def[type].offset;
+	if (command_usage_def[type].decompress_tmp) {
+		comics_document->dir = ev_mkdtemp ("evince-comics-XXXXXX", error);
+                if (comics_document->dir == NULL)
+                        return FALSE;
+
+		/* unrar-free can't create directories, but ev_mkdtemp already created the dir */
+
+		comics_document->decompress_tmp =
+			g_strdup_printf (command_usage_def[type].decompress_tmp, 
+					 quoted_command, quoted_file,
+					 comics_document->dir);
+		g_free (quoted_file);
+		g_free (quoted_command);
+
+		if (!comics_decompress_temp_dir (comics_document->decompress_tmp,
+		    comics_document->selected_command, error))
+			return FALSE;
+		else
+			return TRUE;
+	} else {
+		g_free (quoted_file);
+		g_free (quoted_command);
+		return TRUE;
+	}
+
+}
+
+/* This function chooses an external command for decompressing a comic 
+ * book based on its mime tipe. */
+static gboolean 
+comics_check_decompress_command	(gchar          *mime_type, 
+				 ComicsDocument *comics_document,
+				 GError         **error)
+{
+	gboolean success;
+	gchar *std_out, *std_err;
+	gint retval;
+	GError *err = NULL;
+	
+	/* FIXME, use proper cbr/cbz mime types once they're
+	 * included in shared-mime-info */
+	
+	if (!strcmp (mime_type, "application/x-cbr") ||
+	    !strcmp (mime_type, "application/x-rar")) {
+	        /* The RARLAB provides a no-charge proprietary (freeware) 
+	        * decompress-only client for Linux called unrar. Another 
+		* option is a GPLv2-licensed command-line tool developed by 
+		* the Gna! project. Confusingly enough, the free software RAR 
+		* decoder is also named unrar. For this reason we need to add 
+		* some lines for disambiguation. Sorry for the added the 
+		* complexity but it's life :)
+		* Finally, some distributions, like Debian, rename this free 
+		* option as unrar-free. 
+		* */
+		comics_document->selected_command = 
+					g_find_program_in_path ("unrar");
+		if (comics_document->selected_command) {
+			/* We only use std_err to avoid printing useless error 
+			 * messages on the terminal */
+			success = 
+				g_spawn_command_line_sync (
+				              comics_document->selected_command, 
+							   &std_out, &std_err,
+							   &retval, &err);
+			if (!success) {
+				g_propagate_error (error, err);
+				g_error_free (err);
+				return FALSE;
+			/* I don't check retval status because RARLAB unrar 
+			 * doesn't have a way to return 0 without involving an 
+			 * operation with a file*/
+			} else if (WIFEXITED (retval)) {
+				if (g_strrstr (std_out,"freeware") != NULL)
+					/* The RARLAB freeware client */
+					comics_document->command_usage = RARLABS;
+				else
+					/* The Gna! free software client */
+					comics_document->command_usage = GNAUNRAR;
+
+				g_free (std_out);
+				g_free (std_err);
+				return TRUE;
+			}
+		}
+		/* The Gna! free software client with Debian naming convention */
+		comics_document->selected_command = 
+				g_find_program_in_path ("unrar-free");
+		if (comics_document->selected_command) {
+			comics_document->command_usage = GNAUNRAR;
+			return TRUE;
+		}
+
+	} else if (!strcmp (mime_type, "application/x-cbz") ||
+		   !strcmp (mime_type, "application/zip")) {
+		/* InfoZIP's unzip program */
+		comics_document->selected_command = 
+				g_find_program_in_path ("unzip");
+		comics_document->alternative_command =
+				g_find_program_in_path ("zipnote");
+		if (comics_document->selected_command &&
+		    comics_document->alternative_command) {
+			comics_document->command_usage = UNZIP;
+			return TRUE;
+		}
+
+	} else if (!strcmp (mime_type, "application/x-cb7") ||
+		   !strcmp (mime_type, "application/x-7z-compressed")) {
+		/* 7zr, 7za and 7z are the commands from the p7zip project able 
+		 * to decompress .7z files */ 
+			comics_document->selected_command = 
+				g_find_program_in_path ("7zr");
+			if (comics_document->selected_command) {
+				comics_document->command_usage = P7ZIP;
+				return TRUE;
+			}
+			comics_document->selected_command = 
+				g_find_program_in_path ("7za");
+			if (comics_document->selected_command) {
+				comics_document->command_usage = P7ZIP;
+				return TRUE;
+			}
+			comics_document->selected_command = 
+				g_find_program_in_path ("7z");
+			if (comics_document->selected_command) {
+				comics_document->command_usage = P7ZIP;
+				return TRUE;
+			}
+	} else if (!strcmp (mime_type, "application/x-cbt") ||
+		   !strcmp (mime_type, "application/x-tar")) {
+		/* tar utility (Tape ARchive) */
+		comics_document->selected_command =
+				g_find_program_in_path ("tar");
+		if (comics_document->selected_command) {
+			comics_document->command_usage = TAR;
+			return TRUE;
+		}
+	} else {
+		g_set_error (error,
+			     EV_DOCUMENT_ERROR,
+			     EV_DOCUMENT_ERROR_INVALID,
+			     _("Not a comic book MIME type: %s"),
+			     mime_type);
+			     return FALSE;
+	}
+	g_set_error_literal (error,
+			     EV_DOCUMENT_ERROR,
+			     EV_DOCUMENT_ERROR_INVALID,
+			     _("Can't find an appropriate command to "
+			     "decompress this type of comic book"));
+	return FALSE;
+}
+
+static int
+sort_page_names (gconstpointer a,
+                 gconstpointer b)
+{
+  return strcmp (* (const char **) a, * (const char **) b);
+}
+
+static gboolean
+comics_document_load (EvDocument *document,
+		      const char *uri,
+		      GError    **error)
+{
+	ComicsDocument *comics_document = COMICS_DOCUMENT (document);
+	GSList *supported_extensions;
+	gchar *std_out;
+	gchar *mime_type;
+	gchar **cb_files, *cb_file;
+	gboolean success;
+	int i, retval;
+	GError *err = NULL;
+
+	comics_document->archive = g_filename_from_uri (uri, NULL, error);
+	if (!comics_document->archive)
+		return FALSE;
+
+	mime_type = ev_file_get_mime_type (uri, FALSE, &err);
+	if (!mime_type) {
+		if (err) {
+			g_propagate_error (error, err);
+		} else {
+			g_set_error_literal (error,
+					     EV_DOCUMENT_ERROR,
+					     EV_DOCUMENT_ERROR_INVALID,
+					     _("Unknown MIME Type"));
+		}
+
+		return FALSE;
+	}
+	
+	if (!comics_check_decompress_command (mime_type, comics_document, 
+	error)) {	
+		g_free (mime_type);
+		return FALSE;
+	} else if (!comics_generate_command_lines (comics_document, error)) {
+		   g_free (mime_type);
+		return FALSE;
+	}
+
+	g_free (mime_type);
+
+	/* Get list of files in archive */
+	success = g_spawn_command_line_sync (comics_document->list_command,
+					     &std_out, NULL, &retval, error);
+
+	if (!success) {
+		return FALSE;
+	} else if (!WIFEXITED(retval) || WEXITSTATUS(retval) != EXIT_SUCCESS) {
+		g_set_error_literal (error,
+                                     EV_DOCUMENT_ERROR,
+                                     EV_DOCUMENT_ERROR_INVALID,
+                                     _("File corrupted"));
+		return FALSE;
+	}
+
+	/* FIXME: is this safe against filenames containing \n in the archive ? */
+	cb_files = g_strsplit (std_out, EV_EOL, 0);
+
+	g_free (std_out);
+
+	if (!cb_files) {
+		g_set_error_literal (error,
+				     EV_DOCUMENT_ERROR,
+				     EV_DOCUMENT_ERROR_INVALID,
+				     _("No files in archive"));
+		return FALSE;
+	}
+
+        comics_document->page_names = g_ptr_array_sized_new (64);
+
+	supported_extensions = get_supported_image_extensions ();
+	for (i = 0; cb_files[i] != NULL; i++) {
+		if (comics_document->offset != NO_OFFSET) {
+			if (g_utf8_strlen (cb_files[i],-1) > 
+			    comics_document->offset) {
+				cb_file = 
+					g_utf8_offset_to_pointer (cb_files[i], 
+						       comics_document->offset);
+			} else {
+				continue;
+			}
+		} else {
+			cb_file = cb_files[i];
+		}
+		gchar *suffix = g_strrstr (cb_file, ".");
+		if (!suffix)
+			continue;
+		suffix = g_ascii_strdown (suffix + 1, -1);
+		if (g_slist_find_custom (supported_extensions, suffix,
+					 (GCompareFunc) strcmp) != NULL) {
+                        g_ptr_array_add (comics_document->page_names,
+                                         g_strstrip (g_strdup (cb_file)));
+		}
+		g_free (suffix);
+	}
+	g_strfreev (cb_files);
+	g_slist_foreach (supported_extensions, (GFunc) g_free, NULL);
+	g_slist_free (supported_extensions);
+
+	if (comics_document->page_names->len == 0) {
+		g_set_error (error,
+			     EV_DOCUMENT_ERROR,
+			     EV_DOCUMENT_ERROR_INVALID,
+			     _("No images found in archive %s"),
+			     uri);
+		return FALSE;
+	}
+
+        /* Now sort the pages */
+        g_ptr_array_sort (comics_document->page_names, sort_page_names);
+
+	return TRUE;
+}
+
+
+static gboolean
+comics_document_save (EvDocument *document,
+		      const char *uri,
+		      GError    **error)
+{
+	ComicsDocument *comics_document = COMICS_DOCUMENT (document);
+
+	return ev_xfer_uri_simple (comics_document->archive, uri, error);
+}
+
+static int
+comics_document_get_n_pages (EvDocument *document)
+{
+	ComicsDocument *comics_document = COMICS_DOCUMENT (document);
+
+        if (comics_document->page_names == NULL)
+                return 0;
+
+	return comics_document->page_names->len;
+}
+
+static void
+comics_document_get_page_size (EvDocument *document,
+			       EvPage     *page,
+			       double     *width,
+			       double     *height)
+{
+	GdkPixbufLoader *loader;
+	char **argv;
+	guchar buf[1024];
+	gboolean success, got_size = FALSE;
+	gint outpipe = -1;
+	GPid child_pid;
+	gssize bytes;
+	GdkPixbuf *pixbuf;
+	gchar *filename;
+	ComicsDocument *comics_document = COMICS_DOCUMENT (document);
+	
+	if (!comics_document->decompress_tmp) {
+		argv = extract_argv (document, page->index);
+		success = g_spawn_async_with_pipes (NULL, argv, NULL,
+						    G_SPAWN_SEARCH_PATH | 
+						    G_SPAWN_STDERR_TO_DEV_NULL,
+						    NULL, NULL,
+						    &child_pid,
+						    NULL, &outpipe, NULL, NULL);
+		g_strfreev (argv);
+		g_return_if_fail (success == TRUE);
+
+		loader = gdk_pixbuf_loader_new ();
+		g_signal_connect (loader, "area-prepared",
+				  G_CALLBACK (get_page_size_area_prepared_cb),
+				  &got_size);
+
+		while (outpipe >= 0) {
+			bytes = read (outpipe, buf, 1024);
+		
+			if (bytes > 0)
+			gdk_pixbuf_loader_write (loader, buf, bytes, NULL);
+			if (bytes <= 0 || got_size) {
+				close (outpipe);
+				outpipe = -1;
+				gdk_pixbuf_loader_close (loader, NULL);
+			}
+		}
+
+		if (gdk_pixbuf_loader_get_pixbuf (loader)) {
+			pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
+			if (width)
+				*width = gdk_pixbuf_get_width (pixbuf);
+			if (height)
+				*height = gdk_pixbuf_get_height (pixbuf);
+		}
+
+		g_spawn_close_pid (child_pid);
+		g_object_unref (loader);
+	} else {
+		filename = g_build_filename (comics_document->dir,
+                                             (char *) comics_document->page_names->pdata[page->index],
+					     NULL);
+		pixbuf = gdk_pixbuf_new_from_file (filename, NULL);
+		g_free (filename);
+		if (width)
+			*width = gdk_pixbuf_get_width (pixbuf);
+		if (height)
+			*height = gdk_pixbuf_get_height (pixbuf);
+	}
+}
+
+static void
+get_page_size_area_prepared_cb (GdkPixbufLoader *loader,
+				gpointer         data)
+{
+	gboolean *got_size = data;
+	*got_size = TRUE;
+}
+
+static GdkPixbuf *
+comics_document_render_pixbuf (EvDocument      *document,
+			       EvRenderContext *rc)
+{
+	GdkPixbufLoader *loader;
+	GdkPixbuf *rotated_pixbuf;
+	char **argv;
+	guchar buf[4096];
+	gboolean success;
+	gint outpipe = -1;
+	GPid child_pid;
+	gssize bytes;
+	gint width, height;
+	gchar *filename;
+	ComicsDocument *comics_document = COMICS_DOCUMENT (document);
+	
+	if (!comics_document->decompress_tmp) {
+		argv = extract_argv (document, rc->page->index);
+		success = g_spawn_async_with_pipes (NULL, argv, NULL,
+						    G_SPAWN_SEARCH_PATH | 
+						    G_SPAWN_STDERR_TO_DEV_NULL,
+						    NULL, NULL,
+						    &child_pid,
+						    NULL, &outpipe, NULL, NULL);
+		g_strfreev (argv);
+		g_return_val_if_fail (success == TRUE, NULL);
+
+		loader = gdk_pixbuf_loader_new ();
+		g_signal_connect (loader, "size-prepared",
+				  G_CALLBACK (render_pixbuf_size_prepared_cb), 
+				  &rc->scale);
+
+		while (outpipe >= 0) {
+			bytes = read (outpipe, buf, 4096);
+
+			if (bytes > 0) {
+				gdk_pixbuf_loader_write (loader, buf, bytes, 
+				NULL);
+			} else if (bytes <= 0) {
+				close (outpipe);
+				gdk_pixbuf_loader_close (loader, NULL);
+				outpipe = -1;
+			}
+		}
+
+		rotated_pixbuf = gdk_pixbuf_rotate_simple (
+					gdk_pixbuf_loader_get_pixbuf (loader),
+					360 - rc->rotation);
+		g_spawn_close_pid (child_pid);
+		g_object_unref (loader);
+	} else {
+		filename = 
+			g_build_filename (comics_document->dir,
+                                          (char *) comics_document->page_names->pdata[rc->page->index],
+					  NULL);
+	   
+		gdk_pixbuf_get_file_info (filename, &width, &height);
+		
+		rotated_pixbuf = 
+		  gdk_pixbuf_rotate_simple (gdk_pixbuf_new_from_file_at_size (
+					    filename, width * (rc->scale) + 0.5,
+					    height * (rc->scale) + 0.5, NULL),
+					    360 - rc->rotation);
+		g_free (filename);
+	
+	}
+	return rotated_pixbuf;
+}
+
+static cairo_surface_t *
+comics_document_render (EvDocument      *document,
+			EvRenderContext *rc)
+{
+	GdkPixbuf       *pixbuf;
+	cairo_surface_t *surface;
+
+	pixbuf = comics_document_render_pixbuf (document, rc);
+	surface = ev_document_misc_surface_from_pixbuf (pixbuf);
+	g_object_unref (pixbuf);
+	
+	return surface;
+}
+
+static void
+render_pixbuf_size_prepared_cb (GdkPixbufLoader *loader,
+				gint             width,
+				gint             height,
+				gpointer         data)
+{
+	double *scale = data;
+	int w = (width  * (*scale) + 0.5);
+	int h = (height * (*scale) + 0.5);
+
+	gdk_pixbuf_loader_set_size (loader, w, h);
+}
+
+/**
+ * comics_remove_dir: Removes a directory recursively. 
+ * Returns:
+ *   	0 if it was successfully deleted,
+ * 	-1 if an error occurred 		
+ */
+static int 
+comics_remove_dir (gchar *path_name) 
+{
+	GDir  *content_dir;
+	const gchar *filename;
+	gchar *filename_with_path;
+	
+	if (g_file_test (path_name, G_FILE_TEST_IS_DIR)) {
+		content_dir = g_dir_open  (path_name, 0, NULL);
+		filename  = g_dir_read_name (content_dir);
+		while (filename) {
+			filename_with_path = 
+				g_build_filename (path_name, 
+						  filename, NULL);
+			comics_remove_dir (filename_with_path);
+			g_free (filename_with_path);
+			filename = g_dir_read_name (content_dir);
+		}
+		g_dir_close (content_dir);
+	}
+	/* Note from g_remove() documentation: on Windows, it is in general not 
+	 * possible to remove a file that is open to some process, or mapped 
+	 * into memory.*/
+	return (g_remove (path_name));
+}
+
+static void
+comics_document_finalize (GObject *object)
+{
+	ComicsDocument *comics_document = COMICS_DOCUMENT (object);
+	
+	if (comics_document->decompress_tmp) {
+		if (comics_remove_dir (comics_document->dir) == -1)
+			g_warning (_("There was an error deleting “%s”."),
+				   comics_document->dir);
+		g_free (comics_document->dir);
+	}
+	
+	if (comics_document->page_names) {
+                g_ptr_array_foreach (comics_document->page_names, (GFunc) g_free, NULL);
+                g_ptr_array_free (comics_document->page_names, TRUE);
+	}
+
+	g_free (comics_document->archive);
+	g_free (comics_document->selected_command);
+	g_free (comics_document->alternative_command);
+	g_free (comics_document->extract_command);
+	g_free (comics_document->list_command);
+
+	G_OBJECT_CLASS (comics_document_parent_class)->finalize (object);
+}
+
+static void
+comics_document_class_init (ComicsDocumentClass *klass)
+{
+	GObjectClass    *gobject_class = G_OBJECT_CLASS (klass);
+	EvDocumentClass *ev_document_class = EV_DOCUMENT_CLASS (klass);
+
+	gobject_class->finalize = comics_document_finalize;
+
+	ev_document_class->load = comics_document_load;
+	ev_document_class->save = comics_document_save;
+	ev_document_class->get_n_pages = comics_document_get_n_pages;
+	ev_document_class->get_page_size = comics_document_get_page_size;
+	ev_document_class->render = comics_document_render;
+}
+
+static void
+comics_document_init (ComicsDocument *comics_document)
+{
+	comics_document->archive = NULL;
+	comics_document->page_names = NULL;
+	comics_document->extract_command = NULL;
+}
+
+/* Returns a list of file extensions supported by gdk-pixbuf */
+static GSList*
+get_supported_image_extensions()
+{
+	GSList *extensions = NULL;
+	GSList *formats = gdk_pixbuf_get_formats ();
+	GSList *l;
+
+	for (l = formats; l != NULL; l = l->next) {
+		int i;
+		gchar **ext = gdk_pixbuf_format_get_extensions (l->data);
+
+		for (i = 0; ext[i] != NULL; i++) {
+			extensions = g_slist_append (extensions,
+						     g_strdup (ext[i]));
+		}
+
+		g_strfreev (ext);
+	}
+
+	g_slist_free (formats);
+	return extensions;
+}
+
+static GdkPixbuf *
+comics_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document,
+					  EvRenderContext      *rc,
+					  gboolean              border)
+{
+	GdkPixbuf *thumbnail;
+
+	thumbnail = comics_document_render_pixbuf (EV_DOCUMENT (document), rc);
+
+	if (border) {
+	      GdkPixbuf *tmp_pixbuf = thumbnail;
+	      
+	      thumbnail = ev_document_misc_get_thumbnail_frame (-1, -1, tmp_pixbuf);
+	      g_object_unref (tmp_pixbuf);
+	}
+
+	return thumbnail;
+}
+
+static void
+comics_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
+					   EvRenderContext      *rc,
+					   gint                 *width,
+					   gint                 *height)
+{
+	gdouble page_width, page_height;
+	
+	comics_document_get_page_size (EV_DOCUMENT (document), rc->page,
+				       &page_width, &page_height);
+
+	if (rc->rotation == 90 || rc->rotation == 270) {
+		*width = (gint) (page_height * rc->scale);
+		*height = (gint) (page_width * rc->scale);
+	} else {
+		*width = (gint) (page_width * rc->scale);
+		*height = (gint) (page_height * rc->scale);
+	}
+}
+
+static void
+comics_document_document_thumbnails_iface_init (EvDocumentThumbnailsInterface *iface)
+{
+	iface->get_thumbnail = comics_document_thumbnails_get_thumbnail;
+	iface->get_dimensions = comics_document_thumbnails_get_dimensions;
+}
+
+static char**
+extract_argv (EvDocument *document, gint page)
+{
+	ComicsDocument *comics_document = COMICS_DOCUMENT (document);
+	char **argv;
+	char *command_line, *quoted_archive, *quoted_filename;
+	GError *err = NULL;
+
+        if (page >= comics_document->page_names->len)
+                return NULL;
+
+	if (comics_document->regex_arg) {
+		quoted_archive = comics_regex_quote (comics_document->archive);
+		quoted_filename =
+			comics_regex_quote (comics_document->page_names->pdata[page]);
+	} else {
+		quoted_archive = g_shell_quote (comics_document->archive);
+		quoted_filename = g_shell_quote (comics_document->page_names->pdata[page]);
+	}
+
+	command_line = g_strdup_printf ("%s %s %s",
+					comics_document->extract_command,
+					quoted_archive,
+					quoted_filename);
+	g_shell_parse_argv (command_line, NULL, &argv, &err);
+
+	if (err) {
+		g_warning (_("Error %s"), err->message);
+		g_error_free (err);
+		return NULL;
+	}
+
+	g_free (command_line);
+	g_free (quoted_archive);
+	g_free (quoted_filename);
+	return argv;
+}