1 files changed, 99 insertions, 0 deletions
diff --git a/src/data-estream.c b/src/data-estream.c
new file mode 100644
index 00000000..34f88a7f
--- /dev/null
+++ b/src/data-estream.c
@@ -0,0 +1,99 @@
+/* data-stream.c - A stream based data object.
+ * Copyright (C) 2002, 2004, 2018 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, see <http://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1+
+ */
+
+#if HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#ifdef HAVE_SYS_TYPES_H
+# include <sys/types.h>
+#endif
+
+#include "debug.h"
+#include "data.h"
+
+
+static gpgme_ssize_t
+stream_es_read (gpgme_data_t dh, void *buffer, size_t size)
+{
+  size_t amt = gpgrt_fread (buffer, 1, size, dh->data.e_stream);
+  if (amt > 0)
+    return amt;
+  return gpgrt_ferror (dh->data.e_stream) ? -1 : 0;
+}
+
+
+static gpgme_ssize_t
+stream_es_write (gpgme_data_t dh, const void *buffer, size_t size)
+{
+  size_t amt = gpgrt_fwrite (buffer, 1, size, dh->data.e_stream);
+  if (amt > 0)
+    return amt;
+  return gpgrt_ferror (dh->data.e_stream) ? -1 : 0;
+}
+
+
+static gpgme_off_t
+stream_es_seek (gpgme_data_t dh, gpgme_off_t offset, int whence)
+{
+  int err;
+
+  err = gpgrt_fseeko (dh->data.e_stream, offset, whence);
+  if (err)
+    return -1;
+
+  return gpgrt_ftello (dh->data.e_stream);
+}
+
+
+static int
+stream_es_get_fd (gpgme_data_t dh)
+{
+  gpgrt_fflush (dh->data.e_stream);
+  return gpgrt_fileno (dh->data.e_stream);
+}
+
+
+static struct _gpgme_data_cbs stream_es_cbs =
+  {
+    stream_es_read,
+    stream_es_write,
+    stream_es_seek,
+    NULL,
+    stream_es_get_fd
+  };
+
+
+
+gpgme_error_t
+gpgme_data_new_from_estream (gpgme_data_t *r_dh, gpgrt_stream_t stream)
+{
+  gpgme_error_t err;
+  TRACE_BEG1 (DEBUG_DATA, "gpgme_data_new_from_estream", r_dh, "estream=%p",
+	      stream);
+
+  err = _gpgme_data_new (r_dh, &stream_es_cbs);
+  if (err)
+    return TRACE_ERR (err);
+
+  (*r_dh)->data.e_stream = stream;
+  return TRACE_SUC1 ("dh=%p", *r_dh);
+}