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/* data-fd.c - A file descripor based data object.
Copyright (C) 2002, 2004 g10 Code GmbH
This file is part of GPGME.
GPGME is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of
the License, or (at your option) any later version.
GPGME is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
#if HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#include "debug.h"
#include "data.h"
#if defined(HAVE_W32CE_SYSTEM) && !defined(__MINGW32CE__)
/* We need to provide replacements for read, write and lseek. They
are taken from the cegcc runtime files, written by Pedro Alves
<pedro_alves@portugalmail.pt> in Feb 2007 and placed in the public
domain. (cf. cegcc/src/mingw/mingwex/wince/) */
#include <windows.h>
static int
read (int fildes, void *buf, unsigned int bufsize)
{
DWORD NumberOfBytesRead;
if (bufsize > 0x7fffffff)
bufsize = 0x7fffffff;
if (!ReadFile ((HANDLE) fildes, buf, bufsize, &NumberOfBytesRead, NULL))
return -1;
return (int) NumberOfBytesRead;
}
static int
write (int fildes, const void *buf, unsigned int bufsize)
{
DWORD NumberOfBytesWritten;
if (bufsize > 0x7fffffff)
bufsize = 0x7fffffff;
if (!WriteFile ((HANDLE) fildes, buf, bufsize, &NumberOfBytesWritten, NULL))
return -1;
return (int) NumberOfBytesWritten;
}
static long
lseek (int fildes, long offset, int whence)
{
DWORD mode;
switch (whence)
{
case SEEK_SET:
mode = FILE_BEGIN;
break;
case SEEK_CUR:
mode = FILE_CURRENT;
break;
case SEEK_END:
mode = FILE_END;
break;
default:
/* Specify an invalid mode so SetFilePointer catches it. */
mode = (DWORD)-1;
}
return (long) SetFilePointer ((HANDLE) fildes, offset, NULL, mode);
}
#endif /*HAVE_W32CE_SYSTEM && !__MINGW32CE__*/
static gpgme_ssize_t
fd_read (gpgme_data_t dh, void *buffer, size_t size)
{
return read (dh->data.fd, buffer, size);
}
static gpgme_ssize_t
fd_write (gpgme_data_t dh, const void *buffer, size_t size)
{
return write (dh->data.fd, buffer, size);
}
static gpgme_off_t
fd_seek (gpgme_data_t dh, gpgme_off_t offset, int whence)
{
return lseek (dh->data.fd, offset, whence);
}
static int
fd_get_fd (gpgme_data_t dh)
{
return (dh->data.fd);
}
static struct _gpgme_data_cbs fd_cbs =
{
fd_read,
fd_write,
fd_seek,
NULL,
fd_get_fd
};
gpgme_error_t
gpgme_data_new_from_fd (gpgme_data_t *r_dh, int fd)
{
gpgme_error_t err;
TRACE_BEG1 (DEBUG_DATA, "gpgme_data_new_from_fd", r_dh, "fd=0x%x", fd);
err = _gpgme_data_new (r_dh, &fd_cbs);
if (err)
return TRACE_ERR (err);
(*r_dh)->data.fd = fd;
return TRACE_SUC1 ("dh=%p", *r_dh);
}
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