Line data    Source code

       1             : /* data-fd.c - A file descripor 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_UNISTD_H
      26             : # include <unistd.h>
      27             : #endif
      28             : #ifdef HAVE_SYS_TYPES_H
      29             : # include <sys/types.h>
      30             : #endif
      31             : 
      32             : #include "debug.h"
      33             : #include "data.h"
      34             : 
      35             : 
      36             : 
      37             : #if defined(HAVE_W32CE_SYSTEM) && !defined(__MINGW32CE__)
      38             : /* We need to provide replacements for read, write and lseek.  They
      39             :    are taken from the cegcc runtime files, written by Pedro Alves
      40             :    <pedro_alves@portugalmail.pt> in Feb 2007 and placed in the public
      41             :    domain. (cf. cegcc/src/mingw/mingwex/wince/)  */
      42             : 
      43             : #include <windows.h>
      44             : 
      45             : static int
      46             : read (int fildes, void *buf, unsigned int bufsize)
      47             : {
      48             :   DWORD NumberOfBytesRead;
      49             :   if (bufsize > 0x7fffffff)
      50             :     bufsize = 0x7fffffff;
      51             :   if (!ReadFile ((HANDLE) fildes, buf, bufsize, &NumberOfBytesRead, NULL))
      52             :     return -1;
      53             :   return (int) NumberOfBytesRead;
      54             : }
      55             : 
      56             : static int
      57             : write (int fildes, const void *buf, unsigned int bufsize)
      58             : {
      59             :   DWORD NumberOfBytesWritten;
      60             :   if (bufsize > 0x7fffffff)
      61             :     bufsize = 0x7fffffff;
      62             :   if (!WriteFile ((HANDLE) fildes, buf, bufsize, &NumberOfBytesWritten, NULL))
      63             :     return -1;
      64             :   return (int) NumberOfBytesWritten;
      65             : }
      66             : 
      67             : static long
      68             : lseek (int fildes, long offset, int whence)
      69             : {
      70             :   DWORD mode;
      71             :   switch (whence)
      72             :     {
      73             :     case SEEK_SET:
      74             :       mode = FILE_BEGIN;
      75             :       break;
      76             :     case SEEK_CUR:
      77             :       mode = FILE_CURRENT;
      78             :       break;
      79             :     case SEEK_END:
      80             :       mode = FILE_END;
      81             :       break;
      82             :     default:
      83             :       /* Specify an invalid mode so SetFilePointer catches it.  */
      84             :       mode = (DWORD)-1;
      85             :     }
      86             :   return (long) SetFilePointer ((HANDLE) fildes, offset, NULL, mode);
      87             : }
      88             : #endif /*HAVE_W32CE_SYSTEM && !__MINGW32CE__*/
      89             : 
      90             : 
      91             : 
      92             : static gpgme_ssize_t
      93          32 : fd_read (gpgme_data_t dh, void *buffer, size_t size)
      94             : {
      95          32 :   return read (dh->data.fd, buffer, size);
      96             : }
      97             : 
      98             : 
      99             : static gpgme_ssize_t
     100           4 : fd_write (gpgme_data_t dh, const void *buffer, size_t size)
     101             : {
     102           4 :   return write (dh->data.fd, buffer, size);
     103             : }
     104             : 
     105             : 
     106             : static gpgme_off_t
     107           0 : fd_seek (gpgme_data_t dh, gpgme_off_t offset, int whence)
     108             : {
     109           0 :   return lseek (dh->data.fd, offset, whence);
     110             : }
     111             : 
     112             : 
     113             : static int
     114           0 : fd_get_fd (gpgme_data_t dh)
     115             : {
     116           0 :   return (dh->data.fd);
     117             : }
     118             : 
     119             : 
     120             : static struct _gpgme_data_cbs fd_cbs =
     121             :   {
     122             :     fd_read,
     123             :     fd_write,
     124             :     fd_seek,
     125             :     NULL,
     126             :     fd_get_fd
     127             :   };
     128             : 
     129             : 
     130             : gpgme_error_t
     131          20 : gpgme_data_new_from_fd (gpgme_data_t *r_dh, int fd)
     132             : {
     133             :   gpgme_error_t err;
     134          20 :   TRACE_BEG1 (DEBUG_DATA, "gpgme_data_new_from_fd", r_dh, "fd=0x%x", fd);
     135             : 
     136          20 :   err = _gpgme_data_new (r_dh, &fd_cbs);
     137          20 :   if (err)
     138           0 :     return TRACE_ERR (err);
     139             : 
     140          20 :   (*r_dh)->data.fd = fd;
     141          20 :   return TRACE_SUC1 ("dh=%p", *r_dh);
     142             : }