glib/gio/win32/gwinhttpfileinputstream.c

/* GIO - GLib Input, Output and Streaming Library
 * 
 * Copyright (C) 2006-2007 Red Hat, Inc.
 * Copyright (C) 2008 Novell, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General
 * Public License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * Author: Alexander Larsson <alexl@redhat.com>
 * Author: Tor Lillqvist <tml@novell.com>
 */

#include "config.h"

#include <glib.h>

#include "gcancellable.h"
#include "gioerror.h"
#include "gwinhttpfileinputstream.h"
#include "glibintl.h"

#include "gioalias.h"

struct _GWinHttpFileInputStream
{
  GFileInputStream parent_instance;

  GWinHttpFile *file;
  gboolean request_sent;
  HINTERNET connection;
  HINTERNET request;
};

struct _GWinHttpFileInputStreamClass
{
  GFileInputStreamClass parent_class;
};

#define g_winhttp_file_input_stream_get_type _g_winhttp_file_input_stream_get_type
G_DEFINE_TYPE (GWinHttpFileInputStream, g_winhttp_file_input_stream, G_TYPE_FILE_INPUT_STREAM);

static gssize g_winhttp_file_input_stream_read (GInputStream    *stream,
                                                void            *buffer,
                                                gsize            count,
                                                GCancellable    *cancellable,
                                                GError         **error);

static void
g_winhttp_file_input_stream_finalize (GObject *object)
{
  GWinHttpFileInputStream *winhttp_stream;
  
  winhttp_stream = G_WINHTTP_FILE_INPUT_STREAM (object);

  if (winhttp_stream->request != NULL)
    G_WINHTTP_VFS_GET_CLASS (winhttp_stream->file->vfs)->pWinHttpCloseHandle (winhttp_stream->request);
  if (winhttp_stream->connection != NULL)
    G_WINHTTP_VFS_GET_CLASS (winhttp_stream->file->vfs)->pWinHttpCloseHandle (winhttp_stream->connection);

  G_OBJECT_CLASS (g_winhttp_file_input_stream_parent_class)->finalize (object);
}

static void
g_winhttp_file_input_stream_class_init (GWinHttpFileInputStreamClass *klass)
{
  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
  GInputStreamClass *stream_class = G_INPUT_STREAM_CLASS (klass);
  
  gobject_class->finalize = g_winhttp_file_input_stream_finalize;

  stream_class->read_fn = g_winhttp_file_input_stream_read;
}

static void
g_winhttp_file_input_stream_init (GWinHttpFileInputStream *info)
{
}

/**
 * g_winhttp_file_input_stream_new:
 * @file: the GWinHttpFile being read 
 * @connection: handle to the HTTP connection, as from WinHttpConnect()
 * @request: handle to the HTTP request, as from WinHttpOpenRequest
 * 
 * Returns: #GFileInputStream for the given request
 **/
GFileInputStream *
_g_winhttp_file_input_stream_new (GWinHttpFile *file,
                                  HINTERNET     connection,
                                  HINTERNET     request)
{
  GWinHttpFileInputStream *stream;

  stream = g_object_new (G_TYPE_WINHTTP_FILE_INPUT_STREAM, NULL);

  stream->file = file;
  stream->request_sent = FALSE;
  stream->connection = connection;
  stream->request = request;
  
  return G_FILE_INPUT_STREAM (stream);
}

static gssize
g_winhttp_file_input_stream_read (GInputStream  *stream,
                                  void          *buffer,
                                  gsize          count,
                                  GCancellable  *cancellable,
                                  GError       **error)
{
  GWinHttpFileInputStream *winhttp_stream = G_WINHTTP_FILE_INPUT_STREAM (stream);
  DWORD bytes_read;

  if (!winhttp_stream->request_sent)
    {
      if (!G_WINHTTP_VFS_GET_CLASS (winhttp_stream->file->vfs)->pWinHttpSendRequest
          (winhttp_stream->request,
           NULL, 0,
           NULL, 0,
           0,
           0))
        {
          char *emsg = _g_winhttp_error_message (GetLastError ());
          
          g_set_error (error, G_IO_ERROR,
                       G_IO_ERROR_FAILED,
                       "%s", emsg);
          g_free (emsg);
          
          return -1;
        }
  
      if (!G_WINHTTP_VFS_GET_CLASS (winhttp_stream->file->vfs)->pWinHttpReceiveResponse
          (winhttp_stream->request, NULL))
        {
          char *emsg = _g_winhttp_error_message (GetLastError ());
          g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
                       "%s", emsg);
          g_free (emsg);

          return -1;
        }
      winhttp_stream->request_sent = TRUE;
    }
  
  if (!G_WINHTTP_VFS_GET_CLASS (winhttp_stream->file->vfs)->pWinHttpReadData
      (winhttp_stream->request, buffer, count, &bytes_read))
    {
      char *emsg = _g_winhttp_error_message (GetLastError ());
      g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
                   "%s", emsg);
      g_free (emsg);

      return -1;
    }
  
  return bytes_read;
}