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/* data-compat.c - Compatibility interfaces for data objects.
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* Copyright (C) 2002, 2003, 2004, 2007 g10 Code GmbH
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*
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* This file is part of GPGME.
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*
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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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*
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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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*
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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, see <https://gnu.org/licenses/>.
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*/
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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 <errno.h>
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#ifdef HAVE_SYS_TIME_H
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# include <sys/time.h>
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#endif
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#ifdef HAVE_SYS_STAT_H
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# include <sys/stat.h>
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#endif
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#include <stdlib.h>
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#include "data.h"
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#include "util.h"
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#include "debug.h"
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/* Create a new data buffer filled with LENGTH bytes starting from
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OFFSET within the file FNAME or stream STREAM (exactly one must be
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non-zero). */
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gpgme_error_t
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gpgme_data_new_from_filepart (gpgme_data_t *r_dh, const char *fname,
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FILE *stream, gpgme_off_t offset, size_t length)
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{
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gpgme_error_t err;
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char *buf = NULL;
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int res;
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TRACE_BEG (DEBUG_DATA, "gpgme_data_new_from_filepart", r_dh,
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"file_name=%s, stream=%p, offset=%lli, length=%zu",
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fname, stream, (long long int)offset, length);
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if (stream && fname)
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return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));
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if (fname)
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stream = fopen (fname, "rb");
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if (!stream)
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return TRACE_ERR (gpg_error_from_syserror ());
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#ifdef HAVE_FSEEKO
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res = fseeko (stream, offset, SEEK_SET);
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#else
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/* FIXME: Check for overflow, or at least bail at compilation. */
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res = fseek (stream, offset, SEEK_SET);
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#endif
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if (res)
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{
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int saved_err = gpg_error_from_syserror ();
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if (fname)
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fclose (stream);
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return TRACE_ERR (saved_err);
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}
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buf = malloc (length);
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if (!buf)
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{
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int saved_err = gpg_error_from_syserror ();
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if (fname)
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fclose (stream);
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return TRACE_ERR (saved_err);
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}
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while (fread (buf, length, 1, stream) < 1
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&& ferror (stream) && errno == EINTR);
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if (ferror (stream))
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{
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int saved_err = gpg_error_from_syserror ();
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if (buf)
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free (buf);
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if (fname)
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fclose (stream);
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return TRACE_ERR (saved_err);
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}
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if (fname)
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fclose (stream);
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err = gpgme_data_new (r_dh);
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if (err)
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{
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if (buf)
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free (buf);
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return err;
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}
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(*r_dh)->data.mem.buffer = buf;
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(*r_dh)->data.mem.size = length;
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(*r_dh)->data.mem.length = length;
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TRACE_SUC ("r_dh=%p", *r_dh);
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return 0;
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}
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/* Create a new data buffer filled with the content of file FNAME.
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COPY must be non-zero (delayed reads are not supported yet). */
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gpgme_error_t
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gpgme_data_new_from_file (gpgme_data_t *r_dh, const char *fname, int copy)
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{
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gpgme_error_t err;
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struct stat statbuf;
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TRACE_BEG (DEBUG_DATA, "gpgme_data_new_from_file", r_dh,
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"file_name=%s, copy=%i (%s)", fname, copy, copy ? "yes" : "no");
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if (!fname || !copy)
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return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));
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if (stat (fname, &statbuf) < 0)
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return TRACE_ERR (gpg_error_from_syserror ());
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err = gpgme_data_new_from_filepart (r_dh, fname, NULL, 0, statbuf.st_size);
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return TRACE_ERR (err);
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}
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static int
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gpgme_error_to_errno (gpgme_error_t err)
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{
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int res = gpg_err_code_to_errno (gpg_err_code (err));
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if (!err)
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{
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switch (gpg_err_code (err))
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{
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case GPG_ERR_EOF:
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res = 0;
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break;
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case GPG_ERR_INV_VALUE:
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res = EINVAL;
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break;
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case GPG_ERR_NOT_SUPPORTED:
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res = ENOSYS;
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break;
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default:
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/* FIXME: Yeah, well. */
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res = EINVAL;
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break;
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}
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}
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TRACE (DEBUG_DATA, "gpgme:gpgme_error_to_errno", NULL,
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"mapping %s <%s> to: %s", gpgme_strerror (err),
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gpgme_strsource (err), strerror (res));
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gpg_err_set_errno (res);
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return res ? -1 : 0;
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}
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static gpgme_ssize_t
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old_user_read (gpgme_data_t dh, void *buffer, size_t size)
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{
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gpgme_error_t err;
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size_t amt;
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TRACE_BEG (DEBUG_DATA, "gpgme:old_user_read", dh,
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"buffer=%p, size=%zu", buffer, size);
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err = (*dh->data.old_user.cb) (dh->data.old_user.handle,
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buffer, size, &amt;;
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if (err)
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return TRACE_SYSRES (gpgme_error_to_errno (err));
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return TRACE_SYSRES ((int)amt);
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}
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static gpgme_off_t
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old_user_seek (gpgme_data_t dh, gpgme_off_t offset, int whence)
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{
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gpgme_error_t err;
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TRACE_BEG (DEBUG_DATA, "gpgme:old_user_seek", dh,
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"offset=%llu, whence=%i", (long long int)offset, whence);
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if (whence != SEEK_SET || offset)
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{
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gpg_err_set_errno (EINVAL);
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return TRACE_SYSRES (-1);
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}
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err = (*dh->data.old_user.cb) (dh->data.old_user.handle, NULL, 0, NULL);
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if (err)
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return TRACE_SYSRES (gpgme_error_to_errno (err));
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return TRACE_SYSRES (0);
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}
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static struct _gpgme_data_cbs old_user_cbs =
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{
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old_user_read,
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NULL,
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old_user_seek,
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NULL
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};
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/* Create a new data buffer which retrieves the data from the callback
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function READ_CB. */
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gpgme_error_t
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gpgme_data_new_with_read_cb (gpgme_data_t *r_dh,
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int (*read_cb) (void *, char *, size_t, size_t *),
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void *read_cb_value)
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{
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gpgme_error_t err;
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TRACE_BEG (DEBUG_DATA, "gpgme_data_new_with_read_cb", r_dh,
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"read_cb=%p/%p", read_cb, read_cb_value);
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err = _gpgme_data_new (r_dh, &old_user_cbs);
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if (err)
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return TRACE_ERR (err);
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(*r_dh)->data.old_user.cb = read_cb;
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(*r_dh)->data.old_user.handle = read_cb_value;
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return TRACE_ERR (0);
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}
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