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/* data-stream.c - A stream based data object.
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Copyright (C) 2002, 2004 g10 Code GmbH
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This file is part of GPGME.
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GPGME is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of
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the License, or (at your option) any later version.
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GPGME is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02111-1307, USA. */
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#if HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#include <sys/types.h>
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#include "data.h"
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static ssize_t
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stream_read (gpgme_data_t dh, void *buffer, size_t size)
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{
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size_t amt = fread (buffer, 1, size, dh->data.stream);
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if (amt > 0)
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return amt;
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return ferror (dh->data.stream) ? -1 : 0;
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}
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static ssize_t
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stream_write (gpgme_data_t dh, const void *buffer, size_t size)
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{
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size_t amt = fwrite (buffer, 1, size, dh->data.stream);
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if (amt > 0)
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return amt;
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return ferror (dh->data.stream) ? -1 : 0;
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}
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static off_t
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stream_seek (gpgme_data_t dh, off_t offset, int whence)
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{
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int err;
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#ifdef HAVE_FSEEKO
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err = fseeko (dh->data.stream, offset, whence);
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#else
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/* FIXME: Check for overflow, or at least bail at compilation. */
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err = fseek (dh->data.stream, offset, whence);
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#endif
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if (err)
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return -1;
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#ifdef HAVE_FSEEKO
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return ftello (dh->data.stream);
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#else
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return ftell (dh->data.stream);
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#endif
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}
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static int
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stream_get_fd (gpgme_data_t dh)
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{
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fflush (dh->data.stream);
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return fileno (dh->data.stream);
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}
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static struct _gpgme_data_cbs stream_cbs =
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{
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stream_read,
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stream_write,
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stream_seek,
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NULL,
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stream_get_fd
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};
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gpgme_error_t
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gpgme_data_new_from_stream (gpgme_data_t *dh, FILE *stream)
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{
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gpgme_error_t err = _gpgme_data_new (dh, &stream_cbs);
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if (err)
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return err;
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(*dh)->data.stream = stream;
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return 0;
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}
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