Line data    Source code

       1             : /* data-stream.c - A stream based data object.
       2             :  * Copyright (C) 2002, 2004, 2018 g10 Code GmbH
       3             :  *
       4             :  * This file is part of GPGME.
       5             :  *
       6             :  * GPGME is free software; you can redistribute it and/or modify it
       7             :  * under the terms of the GNU Lesser General Public License as
       8             :  * published by the Free Software Foundation; either version 2.1 of
       9             :  * the License, or (at your option) any later version.
      10             :  *
      11             :  * GPGME is distributed in the hope that it will be useful, but
      12             :  * WITHOUT ANY WARRANTY; without even the implied warranty of
      13             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14             :  * Lesser General Public License for more details.
      15             :  *
      16             :  * You should have received a copy of the GNU Lesser General Public
      17             :  * License along with this program; if not, see <https://www.gnu.org/licenses/>.
      18             :  * SPDX-License-Identifier: LGPL-2.1+
      19             :  */
      20             : 
      21             : #if HAVE_CONFIG_H
      22             : #include <config.h>
      23             : #endif
      24             : 
      25             : #include <stdio.h>
      26             : #ifdef HAVE_SYS_TYPES_H
      27             : # include <sys/types.h>
      28             : #endif
      29             : 
      30             : #include "debug.h"
      31             : #include "data.h"
      32             : 
      33             : 
      34             : static gpgme_ssize_t
      35           0 : stream_es_read (gpgme_data_t dh, void *buffer, size_t size)
      36             : {
      37           0 :   size_t amt = gpgrt_fread (buffer, 1, size, dh->data.e_stream);
      38           0 :   if (amt > 0)
      39           0 :     return amt;
      40           0 :   return gpgrt_ferror (dh->data.e_stream) ? -1 : 0;
      41             : }
      42             : 
      43             : 
      44             : static gpgme_ssize_t
      45           0 : stream_es_write (gpgme_data_t dh, const void *buffer, size_t size)
      46             : {
      47           0 :   size_t amt = gpgrt_fwrite (buffer, 1, size, dh->data.e_stream);
      48           0 :   if (amt > 0)
      49           0 :     return amt;
      50           0 :   return gpgrt_ferror (dh->data.e_stream) ? -1 : 0;
      51             : }
      52             : 
      53             : 
      54             : static gpgme_off_t
      55           0 : stream_es_seek (gpgme_data_t dh, gpgme_off_t offset, int whence)
      56             : {
      57             :   int err;
      58             : 
      59           0 :   err = gpgrt_fseeko (dh->data.e_stream, offset, whence);
      60           0 :   if (err)
      61           0 :     return -1;
      62             : 
      63           0 :   return gpgrt_ftello (dh->data.e_stream);
      64             : }
      65             : 
      66             : 
      67             : static int
      68           0 : stream_es_get_fd (gpgme_data_t dh)
      69             : {
      70           0 :   gpgrt_fflush (dh->data.e_stream);
      71           0 :   return gpgrt_fileno (dh->data.e_stream);
      72             : }
      73             : 
      74             : 
      75             : static struct _gpgme_data_cbs stream_es_cbs =
      76             :   {
      77             :     stream_es_read,
      78             :     stream_es_write,
      79             :     stream_es_seek,
      80             :     NULL,
      81             :     stream_es_get_fd
      82             :   };
      83             : 
      84             : 
      85             : 
      86             : gpgme_error_t
      87           0 : gpgme_data_new_from_estream (gpgme_data_t *r_dh, gpgrt_stream_t stream)
      88             : {
      89             :   gpgme_error_t err;
      90           0 :   TRACE_BEG1 (DEBUG_DATA, "gpgme_data_new_from_estream", r_dh, "estream=%p",
      91             :               stream);
      92             : 
      93           0 :   err = _gpgme_data_new (r_dh, &stream_es_cbs);
      94           0 :   if (err)
      95           0 :     return TRACE_ERR (err);
      96             : 
      97           0 :   (*r_dh)->data.e_stream = stream;
      98           0 :   return TRACE_SUC1 ("dh=%p", *r_dh);
      99             : }