1 /* data-user.c - A user callback based data object.
2 Copyright (C) 2002, 2004 g10 Code GmbH
4 This file is part of GPGME.
6 GPGME is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as
8 published by the Free Software Foundation; either version 2.1 of
9 the License, or (at your option) any later version.
11 GPGME is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
25 #ifdef HAVE_SYS_TYPES_H
26 # include <sys/types.h>
35 user_read (gpgme_data_t dh, void *buffer, size_t size)
37 if (!dh->data.user.cbs->read)
39 gpg_err_set_errno (EBADF);
43 return (*dh->data.user.cbs->read) (dh->data.user.handle, buffer, size);
48 user_write (gpgme_data_t dh, const void *buffer, size_t size)
50 if (!dh->data.user.cbs->write)
52 gpg_err_set_errno (EBADF);
56 return (*dh->data.user.cbs->write) (dh->data.user.handle, buffer, size);
61 user_seek (gpgme_data_t dh, off_t offset, int whence)
63 if (!dh->data.user.cbs->seek)
65 gpg_err_set_errno (EBADF);
69 return (*dh->data.user.cbs->seek) (dh->data.user.handle, offset, whence);
74 user_release (gpgme_data_t dh)
76 if (dh->data.user.cbs->release)
77 (*dh->data.user.cbs->release) (dh->data.user.handle);
81 static struct _gpgme_data_cbs user_cbs =
92 gpgme_data_new_from_cbs (gpgme_data_t *r_dh, gpgme_data_cbs_t cbs, void *handle)
95 TRACE_BEG1 (DEBUG_DATA, "gpgme_data_new_from_cbs", r_dh, "handle=%p", handle);
97 err = _gpgme_data_new (r_dh, &user_cbs);
99 return TRACE_ERR (err);
101 (*r_dh)->data.user.cbs = cbs;
102 (*r_dh)->data.user.handle = handle;
103 return TRACE_SUC1 ("dh=%p", *r_dh);