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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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA. */
#if HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/types.h>
#include <errno.h>
#include "data.h"
static ssize_t
user_read (gpgme_data_t dh, void *buffer, size_t size)
{
if (!dh->data.user.cbs->read)
return EBADF;
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)
return EBADF;
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)
return EBADF;
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 *dh, gpgme_data_cbs_t cbs, void *handle)
{
gpgme_error_t err = _gpgme_data_new (dh, &user_cbs);
if (err)
return err;
(*dh)->data.user.cbs = cbs;
(*dh)->data.user.handle = handle;
return 0;
}
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