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 #include <libgnome/gnome-init.h>
  37
  38 #include "ev-file-helpers.h"
  39
  40 static gchar *dot_dir = NULL;
  41 static gchar *tmp_dir = NULL;
  42 static gint   count = 0;
  43
  44 static gboolean
  45 ensure_dir_exists (const char *dir)
  46 {
  47         if (g_file_test (dir, G_FILE_TEST_IS_DIR))
  48                 return TRUE;
  49
  50         if (g_mkdir (dir, 488) == 0)
  51                 return TRUE;
  52
  53         if (errno == EEXIST)
  54                 return g_file_test (dir, G_FILE_TEST_IS_DIR);
  55
  56         g_warning ("Failed to create directory %s: %s", dir, strerror (errno));
  57         return FALSE;
  58 }
  59
  60 const gchar *
  61 ev_dot_dir (void)
  62 {
  63         if (dot_dir == NULL) {
  64                 gboolean exists;
  65
  66                 dot_dir = g_build_filename (gnome_user_dir_get (),
  67                                             "evince",
  68                                             NULL);
  69
  70                 exists = ensure_dir_exists (dot_dir);
  71                 if (!exists)
  72                         exit (1);
  73         }
  74
  75         return dot_dir;
  76 }
  77
  78 const gchar *
  79 ev_tmp_dir (void)
  80 {
  81         if (tmp_dir == NULL) {
  82                 gboolean exists;
  83                 gchar   *dirname;
  84
  85                 dirname = g_strdup_printf ("evince-%u", getpid ());
  86                 tmp_dir = g_build_filename (g_get_tmp_dir (),
  87                                             dirname,
  88                                             NULL);
  89                 g_free (dirname);
  90
  91                 exists = ensure_dir_exists (tmp_dir);
  92                 g_assert (exists);
  93         }
  94
  95         return tmp_dir;
  96 }
  97
  98 void
  99 ev_file_helpers_init (void)
 100 {
 101 }
 102
 103 void
 104 ev_file_helpers_shutdown (void)
 105 {
 106         if (tmp_dir != NULL)
 107                 g_rmdir (tmp_dir);
 108
 109         g_free (tmp_dir);
 110         g_free (dot_dir);
 111
 112         dot_dir = NULL;
 113         tmp_dir = NULL;
 114 }
 115
 116 gchar *
 117 ev_tmp_filename (const gchar *prefix)
 118 {
 119         gchar *basename;
 120         gchar *filename = NULL;
 121
 122         do {
 123                 if (filename != NULL)
 124                         g_free (filename);
 125
 126                 basename = g_strdup_printf ("%s-%d",
 127                                             prefix ? prefix : "document",
 128                                             count ++);
 129
 130                 filename = g_build_filename (ev_tmp_dir (),
 131                                              basename, NULL);
 132
 133                 g_free (basename);
 134         } while (g_file_test (filename, G_FILE_TEST_EXISTS));
 135
 136         return filename;
 137 }
 138
 139 gboolean
 140 ev_xfer_uri_simple (const char *from,
 141                     const char *to,
 142                     GError     **error)
 143 {
 144         GnomeVFSResult result;
 145         GnomeVFSURI *source_uri;
 146         GnomeVFSURI *target_uri;
 147
 148         if (!from)
 149                 return FALSE;
 150
 151         source_uri = gnome_vfs_uri_new (from);
 152         target_uri = gnome_vfs_uri_new (to);
 153
 154         result = gnome_vfs_xfer_uri (source_uri, target_uri,
 155                                      GNOME_VFS_XFER_DEFAULT | GNOME_VFS_XFER_FOLLOW_LINKS,
 156                                      GNOME_VFS_XFER_ERROR_MODE_ABORT,
 157                                      GNOME_VFS_XFER_OVERWRITE_MODE_REPLACE,
 158                                      NULL,
 159                                      NULL);
 160         gnome_vfs_uri_unref (target_uri);
 161         gnome_vfs_uri_unref (source_uri);
 162
 163         if (result != GNOME_VFS_OK)
 164                 g_set_error (error,
 165                              G_FILE_ERROR,
 166                              G_FILE_ERROR_FAILED,
 167                              gnome_vfs_result_to_string (result));
 168         return (result == GNOME_VFS_OK);
 169
 170 }
 171
 172 /* Compressed files support */
 173 #define BZIPCOMMAND "bzip2"
 174 #define GZIPCOMMAND "gzip"
 175 #define N_ARGS      4
 176 #define BUFFER_SIZE 1024
 177
 178 static gchar *
 179 compression_run (const gchar       *uri,
 180                  EvCompressionType  type,
 181                  gboolean           compress,
 182                  GError           **error)
 183 {
 184         gchar *argv[N_ARGS];
 185         gchar *uri_dst = NULL;
 186         gchar *filename, *filename_dst;
 187         gchar *cmd;
 188         gint   fd, pout;
 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         filename = g_filename_from_uri (uri, NULL, NULL);
 198         if (!filename) {
 199                 g_free (cmd);
 200                 return NULL;
 201         }
 202
 203         filename_dst = g_build_filename (ev_tmp_dir (), "evinceXXXXXX", NULL);
 204         fd = g_mkstemp (filename_dst);
 205         if (fd < 0) {
 206                 g_free (cmd);
 207                 g_free (filename);
 208                 g_free (filename_dst);
 209                 return NULL;
 210         }
 211
 212         argv[0] = cmd;
 213         argv[1] = compress ? "-c" : "-cd";
 214         argv[2] = filename;
 215         argv[3] = NULL;
 216
 217         if (g_spawn_async_with_pipes (NULL, argv, NULL,
 218                                       G_SPAWN_STDERR_TO_DEV_NULL,
 219                                       NULL, NULL, NULL,
 220                                       NULL, &pout, NULL, error)) {
 221                 GIOChannel *in, *out;
 222                 gchar buf[BUFFER_SIZE];
 223                 GIOStatus read_st, write_st;
 224                 gsize bytes_read, bytes_written;
 225
 226                 in = g_io_channel_unix_new (pout);
 227                 g_io_channel_set_encoding (in, NULL, NULL);
 228                 out = g_io_channel_unix_new (fd);
 229                 g_io_channel_set_encoding (out, NULL, NULL);
 230
 231                 do {
 232                         read_st = g_io_channel_read_chars (in, buf,
 233                                                            BUFFER_SIZE,
 234                                                            &bytes_read,
 235                                                            error);
 236                         if (read_st == G_IO_STATUS_NORMAL) {
 237                                 write_st = g_io_channel_write_chars (out, buf,
 238                                                                      bytes_read,
 239                                                                      &bytes_written,
 240                                                                      error);
 241                                 if (write_st == G_IO_STATUS_ERROR)
 242                                         break;
 243                         } else if (read_st == G_IO_STATUS_ERROR) {
 244                                 break;
 245                         }
 246                 } while (bytes_read > 0);
 247
 248                 g_io_channel_unref (in);
 249                 g_io_channel_unref (out);
 250         }
 251
 252         close (fd);
 253
 254         if (*error == NULL) {
 255                 uri_dst = g_filename_to_uri (filename_dst, NULL, NULL);
 256         }
 257
 258         g_free (cmd);
 259         g_free (filename);
 260         g_free (filename_dst);
 261
 262         return uri_dst;
 263 }
 264
 265 gchar *
 266 ev_file_uncompress (const gchar       *uri,
 267                     EvCompressionType  type,
 268                     GError           **error)
 269 {
 270         g_return_val_if_fail (uri != NULL, NULL);
 271
 272         return compression_run (uri, type, FALSE, error);
 273 }
 274
 275 gchar *
 276 ev_file_compress (const gchar       *uri,
 277                   EvCompressionType  type,
 278                   GError           **error)
 279 {
 280         g_return_val_if_fail (uri != NULL, NULL);
 281
 282         return compression_run (uri, type, TRUE, error);
 283 }