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/* data-stream.c - A stream 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
02111-1307, USA. */
#if HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <sys/types.h>
#include "data.h"
static ssize_t
stream_read (gpgme_data_t dh, void *buffer, size_t size)
{
size_t amt = fread (buffer, 1, size, dh->data.stream);
if (amt > 0)
return amt;
return ferror (dh->data.stream) ? -1 : 0;
}
static ssize_t
stream_write (gpgme_data_t dh, const void *buffer, size_t size)
{
size_t amt = fwrite (buffer, 1, size, dh->data.stream);
if (amt > 0)
return amt;
return ferror (dh->data.stream) ? -1 : 0;
}
static off_t
stream_seek (gpgme_data_t dh, off_t offset, int whence)
{
int err;
#ifdef HAVE_FSEEKO
err = fseeko (dh->data.stream, offset, whence);
#else
/* FIXME: Check for overflow, or at least bail at compilation. */
err = fseek (dh->data.stream, offset, whence);
#endif
if (err)
return -1;
#ifdef HAVE_FSEEKO
return ftello (dh->data.stream);
#else
return ftell (dh->data.stream);
#endif
}
static int
stream_get_fd (gpgme_data_t dh)
{
fflush (dh->data.stream);
return fileno (dh->data.stream);
}
static struct _gpgme_data_cbs stream_cbs =
{
stream_read,
stream_write,
stream_seek,
NULL,
stream_get_fd
};
gpgme_error_t
gpgme_data_new_from_stream (gpgme_data_t *dh, FILE *stream)
{
gpgme_error_t err = _gpgme_data_new (dh, &stream_cbs);
if (err)
return err;
(*dh)->data.stream = stream;
return 0;
}
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