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-rw-r--r--src/data-user.c104
1 files changed, 104 insertions, 0 deletions
diff --git a/src/data-user.c b/src/data-user.c
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--- /dev/null
+++ b/src/data-user.c
@@ -0,0 +1,104 @@
+/* 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
+
+#ifdef HAVE_SYS_TYPES_H
+# include <sys/types.h>
+#endif
+#include <errno.h>
+
+#include "debug.h"
+#include "data.h"
+
+
+static ssize_t
+user_read (gpgme_data_t dh, void *buffer, size_t size)
+{
+ if (!dh->data.user.cbs->read)
+ {
+ gpg_err_set_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)
+ {
+ gpg_err_set_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)
+ {
+ gpg_err_set_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 *r_dh, gpgme_data_cbs_t cbs, void *handle)
+{
+ gpgme_error_t err;
+ TRACE_BEG1 (DEBUG_DATA, "gpgme_data_new_from_cbs", r_dh, "handle=%p", handle);
+
+ err = _gpgme_data_new (r_dh, &user_cbs);
+ if (err)
+ return TRACE_ERR (err);
+
+ (*r_dh)->data.user.cbs = cbs;
+ (*r_dh)->data.user.handle = handle;
+ return TRACE_SUC1 ("dh=%p", *r_dh);
+}