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GFileInputStream provides input streams that take their content from a file.
GFileInputStream implements GSeekable, which allows the input 
stream to jump to arbitrary positions in the file, provided the 
filesystem of the file allows it. To find the position of a file
input stream, use g_seekable_tell(). To find out if a file input
stream supports seeking, use g_seekable_can_seek().
To position a file input stream, use g_seekable_seek().
GFileInfo * g_file_input_stream_query_info (GFileInputStream *stream,const char *attributes,GCancellable *cancellable,GError **error);
Queries a file input stream the given attributes
. This function blocks 
while querying the stream. For the asynchronous (non-blocking) version 
of this function, see g_file_input_stream_query_info_async(). While the 
stream is blocked, the stream will set the pending flag internally, and 
any other operations on the stream will fail with G_IO_ERROR_PENDING.
| stream | ||
| attributes | a file attribute query string. | |
| cancellable |  optional GCancellable object,  | [allow-none] | 
| error | a GError location to store the error occurring, or  | 
void g_file_input_stream_query_info_async (GFileInputStream *stream,const char *attributes,int io_priority,GCancellable *cancellable,GAsyncReadyCallback callback,gpointer user_data);
Queries the stream information asynchronously.
When the operation is finished callback
 will be called. 
You can then call g_file_input_stream_query_info_finish() 
to get the result of the operation.
For the synchronous version of this function, 
see g_file_input_stream_query_info(). 
If cancellable
 is not NULL, then the operation can be cancelled by
triggering the cancellable object from another thread. If the operation
was cancelled, the error G_IO_ERROR_CANCELLED will be set
| stream | ||
| attributes | a file attribute query string. | |
| io_priority | the I/O priority of the request | |
| cancellable |  optional GCancellable object,  | [allow-none] | 
| callback | callback to call when the request is satisfied. | [scope async] | 
| user_data | the data to pass to callback function. | [closure] | 
GFileInfo * g_file_input_stream_query_info_finish (GFileInputStream *stream,GAsyncResult *result,GError **error);
Finishes an asynchronous info query operation.
| stream | ||
| result | a GAsyncResult. | |
| error | a GError location to store the error occurring,
or  | 
typedef struct _GFileInputStream GFileInputStream;
A subclass of GInputStream for opened files. This adds a few file-specific operations and seeking.
GFileInputStream implements GSeekable.