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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*************************************************************************
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * Copyright 2000, 2010 Oracle and/or its affiliates.
 *
 * OpenOffice.org - a multi-platform office productivity suite
 *
 * This file is part of OpenOffice.org.
 *
 * OpenOffice.org is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 3
 * only, as published by the Free Software Foundation.
 *
 * OpenOffice.org 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 version 3 for more details
 * (a copy is included in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU Lesser General Public License
 * version 3 along with OpenOffice.org.  If not, see
 * <http://www.openoffice.org/license.html>
 * for a copy of the LGPLv3 License.
 *
 ************************************************************************/
#ifndef _RTL_UUID_H_
#define _RTL_UUID_H_


#include <sal/types.h>
#include <rtl/string.h>

/**
   @HTML
   @file
   Specification (from draft-leach-uuids-guids-01.txt )

   <p>
   A UUID is an identifier that is unique across both space and time,
   with respect to the space of all UUIDs. To be precise, the UUID
   consists of a finite bit space. Thus, collision cannot be avoided in
   principle. A UUID can be used for multiple purposes, from tagging objects
   with an extremely short lifetime, to reliably identifying very persistent
   objects across a network.

   <p>
    The generation of UUIDs does not require that a registration
    authority be contacted for each identifier. Instead, Version 4 UUIDs are
    generated from (pseudo unique) sequences of (pseudo) random bits.
 */

#ifdef __cplusplus
extern "C" {
#endif

/** Generates a new Version 4 (random number based) UUID (Universally Unique
    IDentifier).

    @param pTargetUUID          pointer to at least 16 bytes of memory. After the call it contains
                                the newly generated uuid in network byte order.
    @param pPredecessorUUID     ignored (was used when this function returned
                                Version 1 instead of Version 4 UUIDs).
    @param bUseEthernetAddress  ignored (was used when this function returned
                                Version 1 instead of Version 4 UUIDs).
 */
void SAL_CALL rtl_createUuid( sal_uInt8 *pTargetUUID ,
                              const sal_uInt8 *pPredecessorUUID,
                              sal_Bool bUseEthernetAddress );

/** Compare two UUID's lexically

    <p>
    Note:   lexical ordering is not temporal ordering!
    <p>
    Note:   For equalnesschecking, a memcmp(pUUID1,pUUID2,16) is more efficient

    @return
    <ul>
    <li>-1   u1 is lexically before u2
    <li>0   u1 is equal to u2
    <li>1   u1 is lexically after u2
    </ul>

 */
sal_Int32 SAL_CALL rtl_compareUuid( const sal_uInt8 *pUUID1 , const sal_uInt8 *pUUID2 );

/** Creates named UUIDs.

    <p>
    The version 3 UUID is meant for generating UUIDs from <em>names</em> that
    are drawn from, and unique within, some <em>name space</em>. Some examples
    of names (and, implicitly, name spaces) might be DNS names, URLs, ISO
    Object IDs (OIDs), reserved words in a programming language, or X.500
    Distinguished Names (DNs); thus, the concept of name and name space
    should be broadly construed, and not limited to textual names.

    <p>
    The requirements for such UUIDs are as follows:

    <ul>
    <li> The UUIDs generated at different times from the same name in the
         same namespace MUST be equal

    <li> The UUIDs generated from two different names in the same namespace
         should be different (with very high probability)

    <li> The UUIDs generated from the same name in two different namespaces
         should be different with (very high probability)

    <li> If two UUIDs that were generated from names are equal, then they
         were generated from the same name in the same namespace (with very
         high probability).
    </ul>

    @param pTargetUUID pointer to at least 16 bytes of memory. After the call
                       it contains the newly generated uuid in network byte order.
    @param pNameSpaceUUID The namespace uuid. Below are some predefined ones,
                          but any arbitray uuid can be used as namespace.

    @param pName the name
 */
void SAL_CALL rtl_createNamedUuid(
    sal_uInt8  *pTargetUUID,
    const sal_uInt8  *pNameSpaceUUID,
    const rtl_String *pName
    );



/*
    Predefined Namespaces
    (Use them the following way : sal_uInt8 aNsDNS[16])  = RTL_UUID_NAMESPACE_DNS;
 */
/** namesapce DNS

    <p>
    (Use them the following way : sal_uInt8 aNsDNS[16])  = RTL_UUID_NAMESPACE_DNS;
    <p>
   6ba7b810-9dad-11d1-80b4-00c04fd430c8 */
#define RTL_UUID_NAMESPACE_DNS {\
      0x6b,0xa7,0xb8,0x10,\
      0x9d,0xad,\
      0x11,0xd1,\
      0x80, 0xb4, 0x00, 0xc0, 0x4f, 0xd4, 0x30, 0xc8\
    }

/** namespace URL

   <p>
   6ba7b811-9dad-11d1-80b4-00c04fd430c8 */
#define RTL_UUID_NAMESPACE_URL { \
      0x6b, 0xa7, 0xb8, 0x11,\
      0x9d, 0xad,\
      0x11, 0xd1,\
      0x80, 0xb4, 0x00, 0xc0, 0x4f, 0xd4, 0x30, 0xc8\
    }

/** namespace oid

    <p>
    6ba7b812-9dad-11d1-80b4-00c04fd430c8 */
#define RTL_UUID_NAMESPACE_OID {\
      0x6b, 0xa7, 0xb8, 0x12,\
      0x9d, 0xad,\
      0x11, 0xd1,\
      0x80, 0xb4, 0x00, 0xc0, 0x4f, 0xd4, 0x30, 0xc8\
    }

/** namespace X500

    <p>
    6ba7b814-9dad-11d1-80b4-00c04fd430c8 */
#define RTL_UUID_NAMESPACE_X500 {\
      0x6b, 0xa7, 0xb8, 0x14,\
      0x9d, 0xad,\
      0x11, 0xd1,\
      0x80, 0xb4, 0x00, 0xc0, 0x4f, 0xd4, 0x30, 0xc8\
    }

#ifdef __cplusplus
}
#endif

#endif

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