1 files changed, 101 insertions, 0 deletions
diff --git a/src/data-stream.c b/src/data-stream.c
new file mode 100644
index 00000000..629fb363
--- /dev/null
+++ b/src/data-stream.c
@@ -0,0 +1,101 @@
+/* data-stream.c - A stream 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 <stdio.h>
+#include <sys/types.h>
+
+#include "data.h"
+
+
+static ssize_t
+stream_read (gpgme_data_t dh, void *buffer, size_t size)
+{
+  size_t amt = fread (buffer, 1, size, dh->data.stream);
+  if (amt > 0)
+    return amt;
+  return ferror (dh->data.stream) ? -1 : 0;
+}
+
+
+static ssize_t
+stream_write (gpgme_data_t dh, const void *buffer, size_t size)
+{
+  size_t amt = fwrite (buffer, 1, size, dh->data.stream);
+  if (amt > 0)
+    return amt;
+  return ferror (dh->data.stream) ? -1 : 0;
+}
+
+
+static off_t
+stream_seek (gpgme_data_t dh, off_t offset, int whence)
+{
+  int err;
+
+#ifdef HAVE_FSEEKO
+  err = fseeko (dh->data.stream, offset, whence);
+#else
+  /* FIXME: Check for overflow, or at least bail at compilation.  */
+  err = fseek (dh->data.stream, offset, whence);
+#endif
+
+  if (err)
+    return -1;
+
+#ifdef HAVE_FSEEKO
+  return ftello (dh->data.stream);
+#else
+  return ftell (dh->data.stream);
+#endif
+}
+
+
+static int
+stream_get_fd (gpgme_data_t dh)
+{
+  fflush (dh->data.stream);
+  return fileno (dh->data.stream);
+}
+
+
+static struct _gpgme_data_cbs stream_cbs =
+  {
+    stream_read,
+    stream_write,
+    stream_seek,
+    NULL,
+    stream_get_fd
+  };
+
+
+gpgme_error_t
+gpgme_data_new_from_stream (gpgme_data_t *dh, FILE *stream)
+{
+  gpgme_error_t err = _gpgme_data_new (dh, &stream_cbs);
+  if (err)
+    return err;
+
+  (*dh)->data.stream = stream;
+  return 0;
+}