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 #include "ev-file-helpers.h"
  38
  39 static gchar *dot_dir = NULL;
  40 static gchar *tmp_dir = NULL;
  41 static gint   count = 0;
  42
  43 static gboolean
  44 ensure_dir_exists (const char *dir)
  45 {
  46         if (g_file_test (dir, G_FILE_TEST_IS_DIR))
  47                 return TRUE;
  48
  49         if (g_mkdir (dir, 488) == 0)
  50                 return TRUE;
  51
  52         if (errno == EEXIST)
  53                 return g_file_test (dir, G_FILE_TEST_IS_DIR);
  54
  55         g_warning ("Failed to create directory %s: %s", dir, strerror (errno));
  56         return FALSE;
  57 }
  58
  59 const gchar *
  60 ev_dot_dir (void)
  61 {
  62         if (dot_dir == NULL) {
  63                 gboolean exists;
  64
  65                 dot_dir = g_build_filename (gnome_user_dir_get (),
  66                                             "evince",
  67                                             NULL);
  68
  69                 exists = ensure_dir_exists (dot_dir);
  70                 if (!exists)
  71                         exit (1);
  72         }
  73
  74         return dot_dir;
  75 }
  76
  77 const gchar *
  78 ev_tmp_dir (void)
  79 {
  80         if (tmp_dir == NULL) {
  81                 gboolean exists;
  82                 gchar   *dirname;
  83
  84                 dirname = g_strdup_printf ("evince-%u", getpid ());
  85                 tmp_dir = g_build_filename (g_get_tmp_dir (),
  86                                             dirname,
  87                                             NULL);
  88                 g_free (dirname);
  89
  90                 exists = ensure_dir_exists (tmp_dir);
  91                 g_assert (exists);
  92         }
  93
  94         return tmp_dir;
  95 }
  96
  97 void
  98 ev_file_helpers_init (void)
  99 {
 100 }
 101
 102 void
 103 ev_file_helpers_shutdown (void)
 104 {
 105         if (tmp_dir != NULL)
 106                 g_rmdir (tmp_dir);
 107
 108         g_free (tmp_dir);
 109         g_free (dot_dir);
 110
 111         dot_dir = NULL;
 112         tmp_dir = NULL;
 113 }
 114
 115 gchar *
 116 ev_tmp_filename (const gchar *prefix)
 117 {
 118         gchar *basename;
 119         gchar *filename = NULL;
 120
 121         do {
 122                 if (filename != NULL)
 123                         g_free (filename);
 124
 125                 basename = g_strdup_printf ("%s-%d",
 126                                             prefix ? prefix : "document",
 127                                             count ++);
 128
 129                 filename = g_build_filename (ev_tmp_dir (),
 130                                              basename, NULL);
 131
 132                 g_free (basename);
 133         } while (g_file_test (filename, G_FILE_TEST_EXISTS));
 134
 135         return filename;
 136 }
 137
 138 gboolean
 139 ev_xfer_uri_simple (const char *from,
 140                     const char *to,
 141                     GError     **error)
 142 {
 143         GnomeVFSResult result;
 144         GnomeVFSURI *source_uri;
 145         GnomeVFSURI *target_uri;
 146
 147         if (!from)
 148                 return FALSE;
 149
 150         source_uri = gnome_vfs_uri_new (from);
 151         target_uri = gnome_vfs_uri_new (to);
 152
 153         result = gnome_vfs_xfer_uri (source_uri, target_uri,
 154                                      GNOME_VFS_XFER_DEFAULT | GNOME_VFS_XFER_FOLLOW_LINKS,
 155                                      GNOME_VFS_XFER_ERROR_MODE_ABORT,
 156                                      GNOME_VFS_XFER_OVERWRITE_MODE_REPLACE,
 157                                      NULL,
 158                                      NULL);
 159         gnome_vfs_uri_unref (target_uri);
 160         gnome_vfs_uri_unref (source_uri);
 161
 162         if (result != GNOME_VFS_OK)
 163                 g_set_error (error,
 164                              G_FILE_ERROR,
 165                              G_FILE_ERROR_FAILED,
 166                              gnome_vfs_result_to_string (result));
 167         return (result == GNOME_VFS_OK);
 168
 169 }
 170
 171 /* Compressed files support */
 172 #define BZIPCOMMAND "bzip2"
 173 #define GZIPCOMMAND "gzip"
 174 #define N_ARGS      5
 175 #define BUFFER_SIZE 1024
 176
 177 gchar *
 178 ev_file_uncompress (const gchar       *uri,
 179                     EvCompressionType  type,
 180                     GError           **error)
 181 {
 182         gchar *argv[N_ARGS];
 183         gchar *uri_unc = NULL;
 184         gchar *filename, *filename_unc;
 185         gchar *cmd;
 186         gint   fd, pout;
 187
 188         g_return_val_if_fail (uri != NULL, NULL);
 189
 190         if (type == EV_COMPRESSION_NONE)
 191                 return NULL;
 192
 193         cmd = g_find_program_in_path ((type == EV_COMPRESSION_BZIP2) ? BZIPCOMMAND : GZIPCOMMAND);
 194         if (!cmd)
 195                 return NULL;
 196
 197
 198         filename = g_filename_from_uri (uri, NULL, NULL);
 199         if (!filename) {
 200                 g_free (cmd);
 201                 return NULL;
 202         }
 203
 204         filename_unc = g_build_filename (ev_tmp_dir (), "evinceXXXXXX", NULL);
 205         fd = g_mkstemp (filename_unc);
 206         if (fd < 0) {
 207                 g_free (cmd);
 208                 g_free (filename);
 209                 g_free (filename_unc);
 210                 return NULL;
 211         }
 212
 213         argv[0] = cmd;
 214         argv[1] = "-cd";
 215         argv[2] = filename;
 216         argv[3] = filename_unc;
 217         argv[4] = NULL;
 218
 219         if (g_spawn_async_with_pipes (NULL, argv, NULL,
 220                                       G_SPAWN_STDERR_TO_DEV_NULL,
 221                                       NULL, NULL, NULL,
 222                                       NULL, &pout, NULL, error)) {
 223                 GIOChannel *in, *out;
 224                 gchar buf[BUFFER_SIZE];
 225                 GIOStatus read_st, write_st;
 226                 gsize bytes_read, bytes_written;
 227
 228                 in = g_io_channel_unix_new (pout);
 229                 g_io_channel_set_encoding (in, NULL, NULL);
 230                 out = g_io_channel_unix_new (fd);
 231                 g_io_channel_set_encoding (out, NULL, NULL);
 232
 233                 do {
 234                         read_st = g_io_channel_read_chars (in, buf,
 235                                                            BUFFER_SIZE,
 236                                                            &bytes_read,
 237                                                            error);
 238                         if (read_st == G_IO_STATUS_NORMAL) {
 239                                 write_st = g_io_channel_write_chars (out, buf,
 240                                                                      bytes_read,
 241                                                                      &bytes_written,
 242                                                                      error);
 243                                 if (write_st == G_IO_STATUS_ERROR)
 244                                         break;
 245                         } else if (read_st == G_IO_STATUS_ERROR) {
 246                                 break;
 247                         }
 248                 } while (bytes_read > 0);
 249
 250                 g_io_channel_unref (in);
 251                 g_io_channel_unref (out);
 252         }
 253
 254         close (fd);
 255
 256         if (*error == NULL) {
 257                 uri_unc = g_filename_to_uri (filename_unc,
 258                                              NULL, NULL);
 259         }
 260
 261         g_free (cmd);
 262         g_free (filename);
 263         g_free (filename_unc);
 264
 265         return uri_unc;
 266 }