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/* -*- mode: C; c-file-style: "gnu" -*- */
/* dbus-marshal.c Marshalling routines
*
* Copyright (C) 2002 CodeFactory AB
*
* Licensed under the Academic Free License version 1.2
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU 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
*
*/
#include "dbus-marshal.h"
#include "dbus-internals.h"
/* This alignment thing is from ORBit2 */
/* Align a value upward to a boundary, expressed as a number of bytes.
E.g. align to an 8-byte boundary with argument of 8. */
/*
* (this + boundary - 1)
* &
* ~(boundary - 1)
*/
#define DBUS_ALIGN_VALUE(this, boundary) \
(( ((unsigned long)(this)) + (((unsigned long)(boundary)) -1)) & (~(((unsigned long)(boundary))-1)))
#define DBUS_ALIGN_ADDRESS(this, boundary) \
((void*)DBUS_ALIGN_VALUE(this, boundary))
/* from ORBit */
static void
swap_bytes (unsigned char *data,
unsigned int len)
{
unsigned char *p1 = data;
unsigned char *p2 = data + len - 1;
while (p1 < p2)
{
unsigned char tmp = *p1;
*p1 = *p2;
*p2 = tmp;
--p2;
++p1;
}
}
dbus_bool_t
_dbus_marshal_double (DBusString *str,
int byte_order,
double value)
{
if (!_dbus_string_set_length (str,
DBUS_ALIGN_VALUE (_dbus_string_get_length (str),
sizeof (double))))
return FALSE;
if (byte_order != DBUS_COMPILER_BYTE_ORDER)
swap_bytes ((unsigned char *)&value, sizeof (double));
return _dbus_string_append_len (str, (const char *)&value, sizeof (double));
}
dbus_bool_t
_dbus_marshal_int32 (DBusString *str,
int byte_order,
dbus_int32_t value)
{
if (!_dbus_string_set_length (str,
DBUS_ALIGN_VALUE (_dbus_string_get_length (str),
sizeof (dbus_int32_t))))
return FALSE;
if (byte_order != DBUS_COMPILER_BYTE_ORDER)
swap_bytes ((unsigned char *)&value, sizeof (dbus_int32_t));
return _dbus_string_append_len (str, (const char *)&value, sizeof (dbus_int32_t));
}
dbus_bool_t
_dbus_marshal_uint32 (DBusString *str,
int byte_order,
dbus_uint32_t value)
{
if (!_dbus_string_set_length (str,
DBUS_ALIGN_VALUE (_dbus_string_get_length (str),
sizeof (dbus_uint32_t))))
return FALSE;
if (byte_order != DBUS_COMPILER_BYTE_ORDER)
swap_bytes ((unsigned char *)&value, sizeof (dbus_uint32_t));
return _dbus_string_append_len (str, (const char *)&value, sizeof (dbus_uint32_t));
}
double
_dbus_demarshal_double (DBusString *str,
int byte_order,
int start)
{
double retval;
const char *buffer;
_dbus_string_get_const_data_len (str, &buffer, start, sizeof (double));
retval = *(double *)buffer;
if (byte_order != DBUS_COMPILER_BYTE_ORDER)
swap_bytes ((unsigned char *)&retval, sizeof (double));
return retval;
}
dbus_int32_t
_dbus_demarshal_int32 (DBusString *str,
int byte_order,
int start)
{
dbus_int32_t retval;
const char *buffer;
_dbus_string_get_const_data_len (str, &buffer, start, sizeof (dbus_int32_t));
retval = *(dbus_int32_t *)buffer;
if (byte_order != DBUS_COMPILER_BYTE_ORDER)
swap_bytes ((unsigned char *)&retval, sizeof (dbus_int32_t));
return retval;
}
dbus_uint32_t
_dbus_demarshal_uint32 (DBusString *str,
int byte_order,
int start)
{
dbus_uint32_t retval;
const char *buffer;
_dbus_string_get_const_data_len (str, &buffer, start, sizeof (dbus_uint32_t));
retval = *(dbus_uint32_t *)buffer;
if (byte_order != DBUS_COMPILER_BYTE_ORDER)
swap_bytes ((unsigned char *)&retval, sizeof (dbus_uint32_t));
return retval;
}
/** @} */
#ifdef DBUS_BUILD_TESTS
#include "dbus-test.h"
#include <stdio.h>
dbus_bool_t
_dbus_marshal_test (void)
{
DBusString str;
int pos = 0;
if (!_dbus_string_init (&str, _DBUS_INT_MAX))
_dbus_assert_not_reached ("failed to init string");
/* Marshal doubles */
if (!_dbus_marshal_double (&str, DBUS_BIG_ENDIAN, 3.14))
_dbus_assert_not_reached ("could not marshal double value");
_dbus_assert (_dbus_demarshal_double (&str, DBUS_BIG_ENDIAN, pos) == 3.14);
pos += 8;
if (!_dbus_marshal_double (&str, DBUS_LITTLE_ENDIAN, 3.14))
_dbus_assert_not_reached ("could not marshal double value");
_dbus_assert (_dbus_demarshal_double (&str, DBUS_LITTLE_ENDIAN, pos) == 3.14);
pos += 8;
/* Marshal signed integers */
if (!_dbus_marshal_int32 (&str, DBUS_BIG_ENDIAN, -12345678))
_dbus_assert_not_reached ("could not marshal signed integer value");
_dbus_assert (_dbus_demarshal_int32 (&str, DBUS_BIG_ENDIAN, pos) == -12345678);
pos += 4;
if (!_dbus_marshal_int32 (&str, DBUS_LITTLE_ENDIAN, -12345678))
_dbus_assert_not_reached ("could not marshal signed integer value");
_dbus_assert (_dbus_demarshal_int32 (&str, DBUS_LITTLE_ENDIAN, pos) == -12345678);
pos += 4;
/* Marshal unsigned integers */
if (!_dbus_marshal_uint32 (&str, DBUS_LITTLE_ENDIAN, 0x12345678))
_dbus_assert_not_reached ("could not marshal signed integer value");
_dbus_assert (_dbus_demarshal_uint32 (&str, DBUS_LITTLE_ENDIAN, pos) == 0x12345678);
pos += 4;
_dbus_string_free (&str);
return TRUE;
}
#endif /* DBUS_BUILD_TESTS */
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