Line data    Source code

       1             : /* data-user.c - A user callback based data object.
       2             :    Copyright (C) 2002, 2004 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, write to the Free Software
      18             :    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
      19             :    02111-1307, USA.  */
      20             : 
      21             : #if HAVE_CONFIG_H
      22             : #include <config.h>
      23             : #endif
      24             : 
      25             : #ifdef HAVE_SYS_TYPES_H
      26             : # include <sys/types.h>
      27             : #endif
      28             : #include <errno.h>
      29             : 
      30             : #include "debug.h"
      31             : #include "data.h"
      32             : 
      33             : 
      34             : static gpgme_ssize_t
      35          26 : user_read (gpgme_data_t dh, void *buffer, size_t size)
      36             : {
      37          26 :   if (!dh->data.user.cbs->read)
      38             :     {
      39           0 :       gpg_err_set_errno (EBADF);
      40           0 :       return -1;
      41             :     }
      42             : 
      43          26 :   return (*dh->data.user.cbs->read) (dh->data.user.handle, buffer, size);
      44             : }
      45             : 
      46             : 
      47             : static gpgme_ssize_t
      48          26 : user_write (gpgme_data_t dh, const void *buffer, size_t size)
      49             : {
      50          26 :   if (!dh->data.user.cbs->write)
      51             :     {
      52           0 :       gpg_err_set_errno (EBADF);
      53           0 :       return -1;
      54             :     }
      55             : 
      56          26 :   return (*dh->data.user.cbs->write) (dh->data.user.handle, buffer, size);
      57             : }
      58             : 
      59             : 
      60             : static gpgme_off_t
      61           0 : user_seek (gpgme_data_t dh, gpgme_off_t offset, int whence)
      62             : {
      63           0 :   if (!dh->data.user.cbs->seek)
      64             :     {
      65           0 :       gpg_err_set_errno (EBADF);
      66           0 :       return -1;
      67             :     }
      68             : 
      69           0 :   return (*dh->data.user.cbs->seek) (dh->data.user.handle, offset, whence);
      70             : }
      71             : 
      72             : 
      73             : static void
      74           2 : user_release (gpgme_data_t dh)
      75             : {
      76           2 :   if (dh->data.user.cbs->release)
      77           0 :     (*dh->data.user.cbs->release) (dh->data.user.handle);
      78           2 : }
      79             : 
      80             : 
      81             : static struct _gpgme_data_cbs user_cbs =
      82             :   {
      83             :     user_read,
      84             :     user_write,
      85             :     user_seek,
      86             :     user_release,
      87             :     NULL
      88             :   };
      89             : 
      90             : 
      91             : gpgme_error_t
      92           2 : gpgme_data_new_from_cbs (gpgme_data_t *r_dh, gpgme_data_cbs_t cbs, void *handle)
      93             : {
      94             :   gpgme_error_t err;
      95           2 :   TRACE_BEG1 (DEBUG_DATA, "gpgme_data_new_from_cbs", r_dh, "handle=%p", handle);
      96             : 
      97           2 :   err = _gpgme_data_new (r_dh, &user_cbs);
      98           2 :   if (err)
      99           0 :     return TRACE_ERR (err);
     100             : 
     101           2 :   (*r_dh)->data.user.cbs = cbs;
     102           2 :   (*r_dh)->data.user.handle = handle;
     103           2 :   return TRACE_SUC1 ("dh=%p", *r_dh);
     104             : }