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/* -*- mode: C; c-file-style: "gnu" -*- */
/* dbus-string-private.h String utility class (internal to D-BUS implementation)
*
* Copyright (C) 2002, 2003 Red Hat, Inc.
*
* Licensed under the Academic Free License version 2.1
*
* 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
*
*/
#ifndef DBUS_STRING_PRIVATE_H
#define DBUS_STRING_PRIVATE_H
#include <config.h>
#include <dbus/dbus-memory.h>
#include <dbus/dbus-types.h>
#ifndef DBUS_CAN_USE_DBUS_STRING_PRIVATE
#error "Don't go including dbus-string-private.h for no good reason"
#endif
DBUS_BEGIN_DECLS
/**
* @brief Internals of DBusString.
*
* DBusString internals. DBusString is an opaque objects, it must be
* used via accessor functions.
*/
typedef struct
{
unsigned char *str; /**< String data, plus nul termination */
int len; /**< Length without nul */
int allocated; /**< Allocated size of data */
int max_length; /**< Max length of this string, without nul byte */
unsigned int constant : 1; /**< String data is not owned by DBusString */
unsigned int locked : 1; /**< DBusString has been locked and can't be changed */
unsigned int invalid : 1; /**< DBusString is invalid (e.g. already freed) */
unsigned int align_offset : 3; /**< str - align_offset is the actual malloc block */
} DBusRealString;
/**
* @defgroup DBusStringInternals DBusString implementation details
* @ingroup DBusInternals
* @brief DBusString implementation details
*
* The guts of DBusString.
*
* @{
*/
/**
* This is the maximum max length (and thus also the maximum length)
* of a DBusString
*/
#define _DBUS_STRING_MAX_MAX_LENGTH (_DBUS_INT32_MAX - _DBUS_STRING_ALLOCATION_PADDING)
/**
* Checks a bunch of assertions about a string object
*
* @param real the DBusRealString
*/
#define DBUS_GENERIC_STRING_PREAMBLE(real) _dbus_assert ((real) != NULL); _dbus_assert (!(real)->invalid); _dbus_assert ((real)->len >= 0); _dbus_assert ((real)->allocated >= 0); _dbus_assert ((real)->max_length >= 0); _dbus_assert ((real)->len <= ((real)->allocated - _DBUS_STRING_ALLOCATION_PADDING)); _dbus_assert ((real)->len <= (real)->max_length)
/**
* Checks assertions about a string object that needs to be
* modifiable - may not be locked or const. Also declares
* the "real" variable pointing to DBusRealString.
* @param str the string
*/
#define DBUS_STRING_PREAMBLE(str) DBusRealString *real = (DBusRealString*) str; \
DBUS_GENERIC_STRING_PREAMBLE (real); \
_dbus_assert (!(real)->constant); \
_dbus_assert (!(real)->locked)
/**
* Checks assertions about a string object that may be locked but
* can't be const. i.e. a string object that we can free. Also
* declares the "real" variable pointing to DBusRealString.
*
* @param str the string
*/
#define DBUS_LOCKED_STRING_PREAMBLE(str) DBusRealString *real = (DBusRealString*) str; \
DBUS_GENERIC_STRING_PREAMBLE (real); \
_dbus_assert (!(real)->constant)
/**
* Checks assertions about a string that may be const or locked. Also
* declares the "real" variable pointing to DBusRealString.
* @param str the string.
*/
#define DBUS_CONST_STRING_PREAMBLE(str) const DBusRealString *real = (DBusRealString*) str; \
DBUS_GENERIC_STRING_PREAMBLE (real)
/** @} */
DBUS_END_DECLS
#endif /* DBUS_STRING_PRIVATE_H */
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