Line data    Source code

       1             : /* data-stream.c - A stream 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             : #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_read (gpgme_data_t dh, void *buffer, size_t size)
      36             : {
      37           0 :   size_t amt = fread (buffer, 1, size, dh->data.stream);
      38           0 :   if (amt > 0)
      39           0 :     return amt;
      40           0 :   return ferror (dh->data.stream) ? -1 : 0;
      41             : }
      42             : 
      43             : 
      44             : static gpgme_ssize_t
      45           0 : stream_write (gpgme_data_t dh, const void *buffer, size_t size)
      46             : {
      47           0 :   size_t amt = fwrite (buffer, 1, size, dh->data.stream);
      48           0 :   if (amt > 0)
      49           0 :     return amt;
      50           0 :   return ferror (dh->data.stream) ? -1 : 0;
      51             : }
      52             : 
      53             : 
      54             : static gpgme_off_t
      55           0 : stream_seek (gpgme_data_t dh, gpgme_off_t offset, int whence)
      56             : {
      57             :   int err;
      58             : 
      59             : #ifdef HAVE_FSEEKO
      60           0 :   err = fseeko (dh->data.stream, offset, whence);
      61             : #else
      62             :   /* FIXME: Check for overflow, or at least bail at compilation.  */
      63             :   err = fseek (dh->data.stream, offset, whence);
      64             : #endif
      65             : 
      66           0 :   if (err)
      67           0 :     return -1;
      68             : 
      69             : #ifdef HAVE_FSEEKO
      70           0 :   return ftello (dh->data.stream);
      71             : #else
      72             :   return ftell (dh->data.stream);
      73             : #endif
      74             : }
      75             : 
      76             : 
      77             : static int
      78           0 : stream_get_fd (gpgme_data_t dh)
      79             : {
      80           0 :   fflush (dh->data.stream);
      81           0 :   return fileno (dh->data.stream);
      82             : }
      83             : 
      84             : 
      85             : static struct _gpgme_data_cbs stream_cbs =
      86             :   {
      87             :     stream_read,
      88             :     stream_write,
      89             :     stream_seek,
      90             :     NULL,
      91             :     stream_get_fd
      92             :   };
      93             : 
      94             : 
      95             : gpgme_error_t
      96           0 : gpgme_data_new_from_stream (gpgme_data_t *r_dh, FILE *stream)
      97             : {
      98             :   gpgme_error_t err;
      99           0 :   TRACE_BEG1 (DEBUG_DATA, "gpgme_data_new_from_stream", r_dh, "stream=%p",
     100             :               stream);
     101             : 
     102           0 :   err = _gpgme_data_new (r_dh, &stream_cbs);
     103           0 :   if (err)
     104           0 :     return TRACE_ERR (err);
     105             : 
     106           0 :   (*r_dh)->data.stream = stream;
     107           0 :   return TRACE_SUC1 ("dh=%p", *r_dh);
     108             : }