libdocument/ev-file-helpers.c

   1 /*
   2  *  Copyright (C) 2002 Jorn Baayen
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License as published by
   6  *  the Free Software Foundation; either version 2, or (at your option)
   7  *  any later version.
   8  *
   9  *  This program is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *  GNU General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License
  15  *  along with this program; if not, write to the Free Software
  16  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17  *
  18  *  $Id$
  19  */
  20
  21 #ifdef HAVE_CONFIG_H
  22 #include "config.h"
  23 #endif
  24
  25 #include <stdlib.h>
  26 #include <sys/types.h>
  27 #include <unistd.h>
  28 #include <string.h>
  29 #include <glib.h>
  30 #include <glib/gstdio.h>
  31 #include <errno.h>
  32 #include <libgnomevfs/gnome-vfs-uri.h>
  33 #include <libgnomevfs/gnome-vfs-utils.h>
  34 #include <libgnomevfs/gnome-vfs-ops.h>
  35 #include <libgnomevfs/gnome-vfs-xfer.h>
  36
  37 #if WITH_GNOME
  38 #include <libgnome/gnome-init.h>
  39 #endif
  40
  41 #include "ev-file-helpers.h"
  42
  43 static gchar *dot_dir = NULL;
  44 static gchar *tmp_dir = NULL;
  45 static gint   count = 0;
  46
  47 static gboolean
  48 ensure_dir_exists (const char *dir)
  49 {
  50         if (g_file_test (dir, G_FILE_TEST_IS_DIR))
  51                 return TRUE;
  52
  53         if (g_mkdir (dir, 488) == 0)
  54                 return TRUE;
  55
  56         if (errno == EEXIST)
  57                 return g_file_test (dir, G_FILE_TEST_IS_DIR);
  58
  59         g_warning ("Failed to create directory %s: %s", dir, strerror (errno));
  60         return FALSE;
  61 }
  62
  63 const gchar *
  64 ev_dot_dir (void)
  65 {
  66         if (dot_dir == NULL) {
  67                 gboolean exists;
  68
  69 #if WITH_GNOME
  70                 dot_dir = g_build_filename (gnome_user_dir_get (),
  71                                             "evince",
  72                                             NULL);
  73 #else
  74                 dot_dir = g_build_filename (g_get_user_config_dir (),
  75                                             "evince",
  76                                             NULL);
  77 #endif
  78
  79                 exists = ensure_dir_exists (dot_dir);
  80                 if (!exists)
  81                         exit (1);
  82         }
  83
  84         return dot_dir;
  85 }
  86
  87 const gchar *
  88 ev_tmp_dir (void)
  89 {
  90         if (tmp_dir == NULL) {
  91                 gboolean exists;
  92                 gchar   *dirname;
  93
  94                 dirname = g_strdup_printf ("evince-%u", getpid ());
  95                 tmp_dir = g_build_filename (g_get_tmp_dir (),
  96                                             dirname,
  97                                             NULL);
  98                 g_free (dirname);
  99
 100                 exists = ensure_dir_exists (tmp_dir);
 101                 g_assert (exists);
 102         }
 103
 104         return tmp_dir;
 105 }
 106
 107 void
 108 ev_file_helpers_init (void)
 109 {
 110 }
 111
 112 void
 113 ev_file_helpers_shutdown (void)
 114 {
 115         if (tmp_dir != NULL)
 116                 g_rmdir (tmp_dir);
 117
 118         g_free (tmp_dir);
 119         g_free (dot_dir);
 120
 121         dot_dir = NULL;
 122         tmp_dir = NULL;
 123 }
 124
 125 gchar *
 126 ev_tmp_filename (const gchar *prefix)
 127 {
 128         gchar *basename;
 129         gchar *filename = NULL;
 130
 131         do {
 132                 if (filename != NULL)
 133                         g_free (filename);
 134
 135                 basename = g_strdup_printf ("%s-%d",
 136                                             prefix ? prefix : "document",
 137                                             count ++);
 138
 139                 filename = g_build_filename (ev_tmp_dir (),
 140                                              basename, NULL);
 141
 142                 g_free (basename);
 143         } while (g_file_test (filename, G_FILE_TEST_EXISTS));
 144
 145         return filename;
 146 }
 147
 148 gboolean
 149 ev_xfer_uri_simple (const char *from,
 150                     const char *to,
 151                     GError     **error)
 152 {
 153         GnomeVFSResult result;
 154         GnomeVFSURI *source_uri;
 155         GnomeVFSURI *target_uri;
 156
 157         if (!from)
 158                 return FALSE;
 159
 160         source_uri = gnome_vfs_uri_new (from);
 161         target_uri = gnome_vfs_uri_new (to);
 162
 163         result = gnome_vfs_xfer_uri (source_uri, target_uri,
 164                                      GNOME_VFS_XFER_DEFAULT | GNOME_VFS_XFER_FOLLOW_LINKS,
 165                                      GNOME_VFS_XFER_ERROR_MODE_ABORT,
 166                                      GNOME_VFS_XFER_OVERWRITE_MODE_REPLACE,
 167                                      NULL,
 168                                      NULL);
 169         gnome_vfs_uri_unref (target_uri);
 170         gnome_vfs_uri_unref (source_uri);
 171
 172         if (result != GNOME_VFS_OK)
 173                 g_set_error (error,
 174                              G_FILE_ERROR,
 175                              G_FILE_ERROR_FAILED,
 176                              gnome_vfs_result_to_string (result));
 177         return (result == GNOME_VFS_OK);
 178
 179 }
 180
 181 /* Compressed files support */
 182 #define BZIPCOMMAND "bzip2"
 183 #define GZIPCOMMAND "gzip"
 184 #define N_ARGS      4
 185 #define BUFFER_SIZE 1024
 186
 187 static gchar *
 188 compression_run (const gchar       *uri,
 189                  EvCompressionType  type,
 190                  gboolean           compress,
 191                  GError           **error)
 192 {
 193         gchar *argv[N_ARGS];
 194         gchar *uri_dst = NULL;
 195         gchar *filename, *filename_dst;
 196         gchar *cmd;
 197         gint   fd, pout;
 198
 199         if (type == EV_COMPRESSION_NONE)
 200                 return NULL;
 201
 202         cmd = g_find_program_in_path ((type == EV_COMPRESSION_BZIP2) ? BZIPCOMMAND : GZIPCOMMAND);
 203         if (!cmd)
 204                 return NULL;
 205
 206         filename = g_filename_from_uri (uri, NULL, NULL);
 207         if (!filename) {
 208                 g_free (cmd);
 209                 return NULL;
 210         }
 211
 212         filename_dst = g_build_filename (ev_tmp_dir (), "evinceXXXXXX", NULL);
 213         fd = g_mkstemp (filename_dst);
 214         if (fd < 0) {
 215                 g_free (cmd);
 216                 g_free (filename);
 217                 g_free (filename_dst);
 218                 return NULL;
 219         }
 220
 221         argv[0] = cmd;
 222         argv[1] = compress ? "-c" : "-cd";
 223         argv[2] = filename;
 224         argv[3] = NULL;
 225
 226         if (g_spawn_async_with_pipes (NULL, argv, NULL,
 227                                       G_SPAWN_STDERR_TO_DEV_NULL,
 228                                       NULL, NULL, NULL,
 229                                       NULL, &pout, NULL, error)) {
 230                 GIOChannel *in, *out;
 231                 gchar buf[BUFFER_SIZE];
 232                 GIOStatus read_st, write_st;
 233                 gsize bytes_read, bytes_written;
 234
 235                 in = g_io_channel_unix_new (pout);
 236                 g_io_channel_set_encoding (in, NULL, NULL);
 237                 out = g_io_channel_unix_new (fd);
 238                 g_io_channel_set_encoding (out, NULL, NULL);
 239
 240                 do {
 241                         read_st = g_io_channel_read_chars (in, buf,
 242                                                            BUFFER_SIZE,
 243                                                            &bytes_read,
 244                                                            error);
 245                         if (read_st == G_IO_STATUS_NORMAL) {
 246                                 write_st = g_io_channel_write_chars (out, buf,
 247                                                                      bytes_read,
 248                                                                      &bytes_written,
 249                                                                      error);
 250                                 if (write_st == G_IO_STATUS_ERROR)
 251                                         break;
 252                         } else if (read_st == G_IO_STATUS_ERROR) {
 253                                 break;
 254                         }
 255                 } while (bytes_read > 0);
 256
 257                 g_io_channel_unref (in);
 258                 g_io_channel_unref (out);
 259         }
 260
 261         close (fd);
 262
 263         if (*error == NULL) {
 264                 uri_dst = g_filename_to_uri (filename_dst, NULL, NULL);
 265         }
 266
 267         g_free (cmd);
 268         g_free (filename);
 269         g_free (filename_dst);
 270
 271         return uri_dst;
 272 }
 273
 274 gchar *
 275 ev_file_uncompress (const gchar       *uri,
 276                     EvCompressionType  type,
 277                     GError           **error)
 278 {
 279         g_return_val_if_fail (uri != NULL, NULL);
 280
 281         return compression_run (uri, type, FALSE, error);
 282 }
 283
 284 gchar *
 285 ev_file_compress (const gchar       *uri,
 286                   EvCompressionType  type,
 287                   GError           **error)
 288 {
 289         g_return_val_if_fail (uri != NULL, NULL);
 290
 291         return compression_run (uri, type, TRUE, error);
 292 }