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/* 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, see <https://gnu.org/licenses/>.
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#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 gpgme_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 gpgme_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 gpgme_off_t
user_seek (gpgme_data_t dh, gpgme_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_BEG (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;
TRACE_SUC ("dh=%p", *r_dh);
return 0;
}
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