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/* data-user.c - A user callback 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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02110-1301, 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 <sys/types.h>
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#include <errno.h>
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#include "data.h"
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static ssize_t
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user_read (gpgme_data_t dh, void *buffer, size_t size)
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{
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if (!dh->data.user.cbs->read)
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return EBADF;
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return (*dh->data.user.cbs->read) (dh->data.user.handle, buffer, size);
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}
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static ssize_t
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user_write (gpgme_data_t dh, const void *buffer, size_t size)
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{
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if (!dh->data.user.cbs->write)
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return EBADF;
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return (*dh->data.user.cbs->write) (dh->data.user.handle, buffer, size);
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}
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static off_t
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user_seek (gpgme_data_t dh, off_t offset, int whence)
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{
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if (!dh->data.user.cbs->seek)
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return EBADF;
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return (*dh->data.user.cbs->seek) (dh->data.user.handle, offset, whence);
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}
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static void
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user_release (gpgme_data_t dh)
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{
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if (dh->data.user.cbs->release)
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(*dh->data.user.cbs->release) (dh->data.user.handle);
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}
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static struct _gpgme_data_cbs user_cbs =
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{
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user_read,
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user_write,
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user_seek,
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user_release,
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NULL
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};
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gpgme_error_t
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gpgme_data_new_from_cbs (gpgme_data_t *dh, gpgme_data_cbs_t cbs, void *handle)
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{
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gpgme_error_t err = _gpgme_data_new (dh, &user_cbs);
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if (err)
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return err;
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(*dh)->data.user.cbs = cbs;
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(*dh)->data.user.handle = handle;
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return 0;
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}
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