1 files changed, 98 insertions, 0 deletions
diff --git a/src/data-user.c b/src/data-user.c
new file mode 100644
index 00000000..ca9e9b12
--- /dev/null
+++ b/src/data-user.c
@@ -0,0 +1,98 @@
+/* data-user.c - A user callback based data object.
+   Copyright (C) 2002, 2004 g10 Code GmbH
+ 
+   This file is part of GPGME.
+ 
+   GPGME 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 2.1 of
+   the License, or (at your option) any later version.
+   
+   GPGME 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 program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+   02111-1307, USA.  */
+
+#if HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <sys/types.h>
+#include <errno.h>
+
+#include "data.h"
+
+
+static ssize_t
+user_read (gpgme_data_t dh, void *buffer, size_t size)
+{
+  if (!dh->data.user.cbs->read)
+    {
+      errno = EBADF;
+      return -1;
+    }
+
+  return (*dh->data.user.cbs->read) (dh->data.user.handle, buffer, size);
+}
+
+
+static ssize_t
+user_write (gpgme_data_t dh, const void *buffer, size_t size)
+{
+  if (!dh->data.user.cbs->write)
+    {
+      errno = EBADF;
+      return -1;
+    }
+
+  return (*dh->data.user.cbs->write) (dh->data.user.handle, buffer, size);
+}
+
+
+static off_t
+user_seek (gpgme_data_t dh, off_t offset, int whence)
+{
+  if (!dh->data.user.cbs->seek)
+    {
+      errno = EBADF;
+      return -1;
+    }
+
+  return (*dh->data.user.cbs->seek) (dh->data.user.handle, offset, whence);
+}
+
+
+static void
+user_release (gpgme_data_t dh)
+{
+  if (dh->data.user.cbs->release)
+    (*dh->data.user.cbs->release) (dh->data.user.handle);
+}
+
+
+static struct _gpgme_data_cbs user_cbs =
+  {
+    user_read,
+    user_write,
+    user_seek,
+    user_release,
+    NULL
+  };
+
+
+gpgme_error_t
+gpgme_data_new_from_cbs (gpgme_data_t *dh, gpgme_data_cbs_t cbs, void *handle)
+{
+  gpgme_error_t err = _gpgme_data_new (dh, &user_cbs);
+  if (err)
+    return err;
+
+  (*dh)->data.user.cbs = cbs;
+  (*dh)->data.user.handle = handle;
+  return 0;
+}