+ return result;
+}
+
+static gchar *
+get_mime_type_from_uri (const gchar *uri, GError **error)
+{
+ GFile *file;
+ GFileInfo *file_info;
+ const gchar *content_type;
+ gchar *mime_type = NULL;
+
+ file = g_file_new_for_uri (uri);
+ file_info = g_file_query_info (file,
+ G_FILE_ATTRIBUTE_STANDARD_CONTENT_TYPE,
+ 0, NULL, error);
+ g_object_unref (file);
+
+ if (file_info == NULL)
+ return NULL;
+
+ content_type = g_file_info_get_content_type (file_info);
+ if (content_type) {
+ mime_type = g_content_type_get_mime_type (content_type);
+ }
+
+ g_object_unref (file_info);
+ return mime_type;
+}
+
+static gchar *
+get_mime_type_from_data (const gchar *uri, GError **error)
+{
+ GFile *file;
+ GFileInputStream *input_stream;
+ gssize size_read;
+ guchar buffer[1024];
+ gboolean retval;
+ gchar *content_type, *mime_type;
+
+ file = g_file_new_for_uri (uri);
+
+ input_stream = g_file_read (file, NULL, error);
+ if (!input_stream) {
+ g_object_unref (file);
+ return NULL;
+ }
+
+ size_read = g_input_stream_read (G_INPUT_STREAM (input_stream),
+ buffer, sizeof (buffer), NULL, error);
+ if (size_read == -1) {
+ g_object_unref (input_stream);
+ g_object_unref (file);
+ return NULL;
+ }
+
+ retval = g_input_stream_close (G_INPUT_STREAM (input_stream), NULL, error);
+
+ g_object_unref (input_stream);
+ g_object_unref (file);
+ if (!retval)
+ return NULL;
+
+ content_type = g_content_type_guess (NULL, /* no filename */
+ buffer, size_read,
+ NULL);
+ if (!content_type)
+ return NULL;
+
+ mime_type = g_content_type_get_mime_type (content_type);
+ g_free (content_type);
+ return mime_type;
+}
+
+/**
+ * ev_file_get_mime_type:
+ * @uri: the URI
+ * @fast: whether to use fast MIME type detection
+ * @error: a #GError location to store an error, or %NULL
+ *
+ * Note: on unknown MIME types, this may return NULL without @error
+ * being filled in.
+ *
+ * Returns: a newly allocated string with the MIME type of the file at
+ * @uri, or %NULL on error or if the MIME type could not be determined
+ */
+gchar *
+ev_file_get_mime_type (const gchar *uri,
+ gboolean fast,
+ GError **error)
+{
+ return fast ? get_mime_type_from_uri (uri, error) : get_mime_type_from_data (uri, error);
+}
+
+/* Compressed files support */
+#define BZIPCOMMAND "bzip2"
+#define GZIPCOMMAND "gzip"
+#define N_ARGS 4
+#define BUFFER_SIZE 1024
+
+static gchar *
+compression_run (const gchar *uri,
+ EvCompressionType type,
+ gboolean compress,
+ GError **error)
+{
+ gchar *argv[N_ARGS];
+ gchar *uri_dst = NULL;
+ gchar *filename, *filename_dst;
+ gchar *cmd;
+ gint fd, pout;
+ GError *err = NULL;
+
+ if (type == EV_COMPRESSION_NONE)
+ return NULL;
+
+ cmd = g_find_program_in_path ((type == EV_COMPRESSION_BZIP2) ? BZIPCOMMAND : GZIPCOMMAND);
+ if (!cmd) {
+ /* FIXME: better error codes! */
+ /* FIXME: i18n later */
+ g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
+ "Failed to find the \"%s\" command in the search path.",
+ type == EV_COMPRESSION_BZIP2 ? BZIPCOMMAND : GZIPCOMMAND);
+ return NULL;
+ }
+
+ filename = g_filename_from_uri (uri, NULL, error);
+ if (!filename) {
+ g_free (cmd);
+ return NULL;
+ }
+
+ filename_dst = g_build_filename (ev_tmp_dir (), "evinceXXXXXX", NULL);
+ fd = g_mkstemp (filename_dst);
+ if (fd < 0) {
+ int errsv = errno;
+
+ g_free (cmd);
+ g_free (filename);
+ g_free (filename_dst);
+
+ g_set_error (error, G_IO_ERROR,
+ g_io_error_from_errno (errsv),
+ "Error creating a temporary file: %s",
+ g_strerror (errsv));
+ return NULL;
+ }
+
+ argv[0] = cmd;
+ argv[1] = compress ? "-c" : "-cd";
+ argv[2] = filename;
+ argv[3] = NULL;
+
+ if (g_spawn_async_with_pipes (NULL, argv, NULL,
+ G_SPAWN_STDERR_TO_DEV_NULL,
+ NULL, NULL, NULL,
+ NULL, &pout, NULL, &err)) {
+ GIOChannel *in, *out;
+ gchar buf[BUFFER_SIZE];
+ GIOStatus read_st, write_st;
+ gsize bytes_read, bytes_written;
+
+ in = g_io_channel_unix_new (pout);
+ g_io_channel_set_encoding (in, NULL, NULL);
+ out = g_io_channel_unix_new (fd);
+ g_io_channel_set_encoding (out, NULL, NULL);
+
+ do {
+ read_st = g_io_channel_read_chars (in, buf,
+ BUFFER_SIZE,
+ &bytes_read,
+ error);
+ if (read_st == G_IO_STATUS_NORMAL) {
+ write_st = g_io_channel_write_chars (out, buf,
+ bytes_read,
+ &bytes_written,
+ error);
+ if (write_st == G_IO_STATUS_ERROR)
+ break;
+ } else if (read_st == G_IO_STATUS_ERROR) {
+ break;
+ }
+ } while (bytes_read > 0);
+
+ g_io_channel_unref (in);
+ g_io_channel_unref (out);
+ }
+
+ close (fd);
+
+ if (err) {
+ g_propagate_error (error, err);
+ } else {
+ uri_dst = g_filename_to_uri (filename_dst, NULL, error);
+ }
+
+ g_free (cmd);
+ g_free (filename);
+ g_free (filename_dst);
+
+ return uri_dst;
+}
+
+/**
+ * ev_file_uncompress:
+ * @uri: a file URI
+ * @type: the compression type
+ * @error: a #GError location to store an error, or %NULL
+ *
+ * Uncompresses the file at @uri.
+ *
+ * If @type is %EV_COMPRESSION_NONE, it does nothing and returns %NULL.
+ *
+ * Otherwise, it returns the filename of a
+ * temporary file containing the decompressed data from the file at @uri.
+ * On error it returns %NULL and fills in @error.
+ *
+ * It is the caller's responsibility to unlink the temp file after use.
+ *
+ * Returns: a newly allocated string URI, or %NULL on error
+ */
+gchar *
+ev_file_uncompress (const gchar *uri,
+ EvCompressionType type,
+ GError **error)
+{
+ g_return_val_if_fail (uri != NULL, NULL);
+
+ return compression_run (uri, type, FALSE, error);
+}
+
+/**
+ * ev_file_compress:
+ * @uri: a file URI
+ * @type: the compression type
+ * @error: a #GError location to store an error, or %NULL
+ *
+ * Compresses the file at @uri.
+
+ * If @type is %EV_COMPRESSION_NONE, it does nothing and returns %NULL.
+ *
+ * Otherwise, it returns the filename of a
+ * temporary file containing the compressed data from the file at @uri.
+ *
+ * On error it returns %NULL and fills in @error.
+ *
+ * It is the caller's responsibility to unlink the temp file after use.
+ *
+ * Returns: a newly allocated string URI, or %NULL on error
+ */
+gchar *
+ev_file_compress (const gchar *uri,
+ EvCompressionType type,
+ GError **error)
+{
+ g_return_val_if_fail (uri != NULL, NULL);