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
  33 #if WITH_GNOME
  34 #include <libgnome/gnome-init.h>
  35 #endif
  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_with_parents (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 (g_get_home_dir (),
  66                                             ".gnome2",
  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 GFile *
 117 ev_tmp_file_get (const gchar *prefix)
 118 {
 119         gchar *path;
 120         GFile *file;
 121
 122         path = ev_tmp_filename (prefix);
 123         file = g_file_new_for_path (path);
 124
 125         g_free (path);
 126
 127         return file;
 128 }
 129
 130 gchar *
 131 ev_tmp_filename (const gchar *prefix)
 132 {
 133         gchar *basename;
 134         gchar *filename = NULL;
 135
 136         do {
 137                 if (filename != NULL)
 138                         g_free (filename);
 139
 140                 basename = g_strdup_printf ("%s-%d",
 141                                             prefix ? prefix : "document",
 142                                             count ++);
 143
 144                 filename = g_build_filename (ev_tmp_dir (),
 145                                              basename, NULL);
 146
 147                 g_free (basename);
 148         } while (g_file_test (filename, G_FILE_TEST_EXISTS));
 149
 150         return filename;
 151 }
 152
 153 /* Remove a local temp file created by evince */
 154 void
 155 ev_tmp_filename_unlink (const gchar *filename)
 156 {
 157         const gchar *tempdir;
 158
 159         if (!filename)
 160                 return;
 161
 162         tempdir = g_get_tmp_dir ();
 163         if (g_ascii_strncasecmp (filename, tempdir, strlen (tempdir)) == 0) {
 164                 g_unlink (filename);
 165         }
 166 }
 167
 168 void
 169 ev_tmp_file_unlink (GFile *file)
 170 {
 171         gboolean res;
 172         GError  *error = NULL;
 173
 174         if (!file)
 175                 return;
 176
 177         res = g_file_delete (file, NULL, &error);
 178         if (!res) {
 179                 char *uri;
 180
 181                 uri = g_file_get_uri (file);
 182                 g_warning ("Unable to delete temp file %s: %s\n", uri, error->message);
 183                 g_free (uri);
 184                 g_error_free (error);
 185         }
 186 }
 187
 188 void
 189 ev_tmp_uri_unlink (const gchar *uri)
 190 {
 191         GFile *file;
 192
 193         if (!uri)
 194                 return;
 195
 196         file = g_file_new_for_uri (uri);
 197         if (!g_file_is_native (file)) {
 198                 g_warning ("Attempting to delete non native uri: %s\n", uri);
 199                 g_object_unref (file);
 200                 return;
 201         }
 202
 203         ev_tmp_file_unlink (file);
 204         g_object_unref (file);
 205 }
 206
 207 gboolean
 208 ev_xfer_uri_simple (const char *from,
 209                     const char *to,
 210                     GError     **error)
 211 {
 212         GFile *source_file;
 213         GFile *target_file;
 214         GError *ioerror = NULL;
 215         gboolean result;
 216
 217         if (!from)
 218                 return FALSE;
 219
 220         source_file = g_file_new_for_uri (from);
 221         target_file = g_file_new_for_uri (to);
 222
 223         result = g_file_copy (source_file, target_file,
 224                               G_FILE_COPY_OVERWRITE,
 225                               NULL, NULL, NULL, &ioerror);
 226
 227         g_object_unref (target_file);
 228         g_object_unref (source_file);
 229
 230         if (!result) {
 231                 g_propagate_error (error, ioerror);
 232         }
 233         return result;
 234
 235 }
 236
 237 static gchar *
 238 get_mime_type_from_uri (const gchar *uri, GError **error)
 239 {
 240         GFile     *file;
 241         GFileInfo *file_info;
 242         gchar     *mime_type;
 243
 244         file = g_file_new_for_uri (uri);
 245         file_info = g_file_query_info (file,
 246                                        G_FILE_ATTRIBUTE_STANDARD_CONTENT_TYPE,
 247                                        0, NULL, error);
 248         g_object_unref (file);
 249
 250         if (file_info == NULL)
 251                 return NULL;
 252
 253         mime_type = g_strdup (g_file_info_get_content_type (file_info));
 254         g_object_unref (file_info);
 255
 256         return mime_type;
 257 }
 258
 259 static gchar *
 260 get_mime_type_from_data (const gchar *uri, GError **error)
 261 {
 262         GFile            *file;
 263         GFileInputStream *input_stream;
 264         gssize            size_read;
 265         guchar            buffer[1024];
 266
 267         file = g_file_new_for_uri (uri);
 268
 269         input_stream = g_file_read (file, NULL, error);
 270         if (!input_stream) {
 271                 g_object_unref (file);
 272                 return NULL;
 273         }
 274
 275         size_read = g_input_stream_read (G_INPUT_STREAM (input_stream),
 276                                          buffer, 1024, NULL, NULL);
 277         g_input_stream_close (G_INPUT_STREAM (input_stream), NULL, error);
 278
 279         g_object_unref (file);
 280
 281         if (size_read == -1)
 282                 return NULL;
 283
 284         return g_content_type_guess (NULL, /* no filename */
 285                                      buffer, 1024,
 286                                      NULL);
 287 }
 288
 289 gchar *
 290 ev_file_get_mime_type (const gchar *uri,
 291                        gboolean     fast,
 292                        GError     **error)
 293 {
 294         return fast ? get_mime_type_from_uri (uri, error) : get_mime_type_from_data (uri, error);
 295 }
 296
 297 /* Compressed files support */
 298 #define BZIPCOMMAND "bzip2"
 299 #define GZIPCOMMAND "gzip"
 300 #define N_ARGS      4
 301 #define BUFFER_SIZE 1024
 302
 303 static gchar *
 304 compression_run (const gchar       *uri,
 305                  EvCompressionType  type,
 306                  gboolean           compress,
 307                  GError           **error)
 308 {
 309         gchar *argv[N_ARGS];
 310         gchar *uri_dst = NULL;
 311         gchar *filename, *filename_dst;
 312         gchar *cmd;
 313         gint   fd, pout;
 314
 315         if (type == EV_COMPRESSION_NONE)
 316                 return NULL;
 317
 318         cmd = g_find_program_in_path ((type == EV_COMPRESSION_BZIP2) ? BZIPCOMMAND : GZIPCOMMAND);
 319         if (!cmd)
 320                 return NULL;
 321
 322         filename = g_filename_from_uri (uri, NULL, NULL);
 323         if (!filename) {
 324                 g_free (cmd);
 325                 return NULL;
 326         }
 327
 328         filename_dst = g_build_filename (ev_tmp_dir (), "evinceXXXXXX", NULL);
 329         fd = g_mkstemp (filename_dst);
 330         if (fd < 0) {
 331                 g_free (cmd);
 332                 g_free (filename);
 333                 g_free (filename_dst);
 334                 return NULL;
 335         }
 336
 337         argv[0] = cmd;
 338         argv[1] = compress ? "-c" : "-cd";
 339         argv[2] = filename;
 340         argv[3] = NULL;
 341
 342         if (g_spawn_async_with_pipes (NULL, argv, NULL,
 343                                       G_SPAWN_STDERR_TO_DEV_NULL,
 344                                       NULL, NULL, NULL,
 345                                       NULL, &pout, NULL, error)) {
 346                 GIOChannel *in, *out;
 347                 gchar buf[BUFFER_SIZE];
 348                 GIOStatus read_st, write_st;
 349                 gsize bytes_read, bytes_written;
 350
 351                 in = g_io_channel_unix_new (pout);
 352                 g_io_channel_set_encoding (in, NULL, NULL);
 353                 out = g_io_channel_unix_new (fd);
 354                 g_io_channel_set_encoding (out, NULL, NULL);
 355
 356                 do {
 357                         read_st = g_io_channel_read_chars (in, buf,
 358                                                            BUFFER_SIZE,
 359                                                            &bytes_read,
 360                                                            error);
 361                         if (read_st == G_IO_STATUS_NORMAL) {
 362                                 write_st = g_io_channel_write_chars (out, buf,
 363                                                                      bytes_read,
 364                                                                      &bytes_written,
 365                                                                      error);
 366                                 if (write_st == G_IO_STATUS_ERROR)
 367                                         break;
 368                         } else if (read_st == G_IO_STATUS_ERROR) {
 369                                 break;
 370                         }
 371                 } while (bytes_read > 0);
 372
 373                 g_io_channel_unref (in);
 374                 g_io_channel_unref (out);
 375         }
 376
 377         close (fd);
 378
 379         if (*error == NULL) {
 380                 uri_dst = g_filename_to_uri (filename_dst, NULL, NULL);
 381         }
 382
 383         g_free (cmd);
 384         g_free (filename);
 385         g_free (filename_dst);
 386
 387         return uri_dst;
 388 }
 389
 390 gchar *
 391 ev_file_uncompress (const gchar       *uri,
 392                     EvCompressionType  type,
 393                     GError           **error)
 394 {
 395         g_return_val_if_fail (uri != NULL, NULL);
 396
 397         return compression_run (uri, type, FALSE, error);
 398 }
 399
 400 gchar *
 401 ev_file_compress (const gchar       *uri,
 402                   EvCompressionType  type,
 403                   GError           **error)
 404 {
 405         g_return_val_if_fail (uri != NULL, NULL);
 406
 407         return compression_run (uri, type, TRUE, error);
 408 }