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/* data-stream.c - A stream based data object.
* Copyright (C) 2002, 2004, 2018 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 <http://www.gnu.org/licenses/>.
* SPDX-License-Identifier: LGPL-2.1+
*/
#if HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#include "debug.h"
#include "data.h"
static gpgme_ssize_t
stream_es_read (gpgme_data_t dh, void *buffer, size_t size)
{
size_t amt = gpgrt_fread (buffer, 1, size, dh->data.e_stream);
if (amt > 0)
return amt;
return gpgrt_ferror (dh->data.e_stream) ? -1 : 0;
}
static gpgme_ssize_t
stream_es_write (gpgme_data_t dh, const void *buffer, size_t size)
{
size_t amt = gpgrt_fwrite (buffer, 1, size, dh->data.e_stream);
if (amt > 0)
return amt;
return gpgrt_ferror (dh->data.e_stream) ? -1 : 0;
}
static gpgme_off_t
stream_es_seek (gpgme_data_t dh, gpgme_off_t offset, int whence)
{
int err;
err = gpgrt_fseeko (dh->data.e_stream, offset, whence);
if (err)
return -1;
return gpgrt_ftello (dh->data.e_stream);
}
static int
stream_es_get_fd (gpgme_data_t dh)
{
gpgrt_fflush (dh->data.e_stream);
return gpgrt_fileno (dh->data.e_stream);
}
static struct _gpgme_data_cbs stream_es_cbs =
{
stream_es_read,
stream_es_write,
stream_es_seek,
NULL,
stream_es_get_fd
};
gpgme_error_t
gpgme_data_new_from_estream (gpgme_data_t *r_dh, gpgrt_stream_t stream)
{
gpgme_error_t err;
TRACE_BEG1 (DEBUG_DATA, "gpgme_data_new_from_estream", r_dh, "estream=%p",
stream);
err = _gpgme_data_new (r_dh, &stream_es_cbs);
if (err)
return TRACE_ERR (err);
(*r_dh)->data.e_stream = stream;
return TRACE_SUC1 ("dh=%p", *r_dh);
}
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