/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/*

 * This file is part of the LibreOffice project.

 *

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/.

 *

 * This file incorporates work covered by the following license notice:

 *

 *   Licensed to the Apache Software Foundation (ASF) under one or more

 *   contributor license agreements. See the NOTICE file distributed

 *   with this work for additional information regarding copyright

 *   ownership. The ASF licenses this file to you under the Apache

 *   License, Version 2.0 (the "License"); you may not use this file

 *   except in compliance with the License. You may obtain a copy of

 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .

 */

#include <string.h>

#include <stdlib.h>

#include <rtl/random.h>

#include <rtl/uuid.h>

#include <rtl/digest.h>

#define SWAP_INT16_TO_NETWORK(x)\

               { sal_uInt16 y = x;\

                 sal_uInt8 *p = reinterpret_cast<sal_uInt8 *>(&(x)); \

                 p[0] = static_cast<sal_uInt8>( ( y >> 8 )  & 0xff );\

                 p[1] = static_cast<sal_uInt8>( ( y ) & 0xff);\

               }

#define SWAP_NETWORK_TO_INT16(x)\

               { sal_uInt16 y = x;\

                 sal_uInt8 *p = reinterpret_cast<sal_uInt8 *>(&(y));\

                 x = ( ( (static_cast<sal_uInt16>(p[0])) & 0xff) << 8 ) |\

                     ( (  static_cast<sal_uInt16>(p[1])) & 0xff);\

               }

#define SWAP_NETWORK_TO_INT32(x)\

               { sal_uInt32 y = x;\

                 sal_uInt8 *p = reinterpret_cast<sal_uInt8 *>(&(y)); \

                 x = ( ( (static_cast<sal_uInt32>(p[0])) & 0xff) << 24 ) |\

                     ( ( (static_cast<sal_uInt32>(p[1])) & 0xff) << 16 ) |\

                     ( ( (static_cast<sal_uInt32>(p[2])) & 0xff) << 8  ) |\

                     ( (  static_cast<sal_uInt32>(p[3])) & 0xff);\

               }

namespace {

struct UUID

{

      sal_uInt32          time_low;

      sal_uInt16          time_mid;

      sal_uInt16          time_hi_and_version;

      sal_uInt8           clock_seq_hi_and_reserved;

      sal_uInt8           clock_seq_low;

      sal_uInt8           node[6];

};

}

static void write_v3( sal_uInt8 *pUuid  )

{

    UUID uuid;

    // copy to avoid alignment problems

    memcpy(&uuid, pUuid, 16);

    SWAP_NETWORK_TO_INT16(uuid.time_hi_and_version);

    /* put in the variant and version bits */

    uuid.time_hi_and_version &= 0x0FFF;

    uuid.time_hi_and_version |= (3 << 12);

    uuid.clock_seq_hi_and_reserved &= 0x3F;

    uuid.clock_seq_hi_and_reserved |= 0x80;

    SWAP_INT16_TO_NETWORK(uuid.time_hi_and_version);

    memcpy(pUuid, &uuid, 16);

}

extern "C" void SAL_CALL rtl_createUuid(sal_uInt8 *pTargetUUID ,

                                        SAL_UNUSED_PARAMETER const sal_uInt8 *,

                                        SAL_UNUSED_PARAMETER sal_Bool)

{

    if (rtl_random_getBytes(nullptr, pTargetUUID, 16) != rtl_Random_E_None)

    {

        abort();

            // only possible way to signal failure here (rtl_createUuid

            // being part of a fixed C API)

    }

    // See ITU-T Recommendation X.667:

    pTargetUUID[6] &= 0x0F;

    pTargetUUID[6] |= 0x40;

    pTargetUUID[8] &= 0x3F;

    pTargetUUID[8] |= 0x80;

}

extern "C" void SAL_CALL rtl_createNamedUuid(sal_uInt8 *pTargetUUID,

                                             const sal_uInt8 *pNameSpaceUUID,

                                             const rtl_String *pName )

{

    rtlDigest digest = rtl_digest_createMD5();

    rtl_digest_updateMD5(digest, pNameSpaceUUID, 16);

    rtl_digest_updateMD5(digest, pName->buffer, pName->length);

    rtl_digest_getMD5(digest, pTargetUUID, 16);

    rtl_digest_destroyMD5(digest);

    write_v3(pTargetUUID);

}

extern "C" sal_Int32 SAL_CALL rtl_compareUuid(const sal_uInt8 *pUUID1, const sal_uInt8 *pUUID2)

{

    int i;

    UUID u1;

    UUID u2;

    memcpy(&u1, pUUID1, 16 );

    memcpy(&u2, pUUID2, 16 );

    SWAP_NETWORK_TO_INT32(u1.time_low);

    SWAP_NETWORK_TO_INT16(u1.time_mid);

    SWAP_NETWORK_TO_INT16(u1.time_hi_and_version);

    SWAP_NETWORK_TO_INT32(u2.time_low);

    SWAP_NETWORK_TO_INT16(u2.time_mid);

    SWAP_NETWORK_TO_INT16(u2.time_hi_and_version);

#define CHECK(f1, f2) if (f1 != f2) return f1 < f2 ? -1 : 1;

    CHECK(u1.time_low, u2.time_low);

    CHECK(u1.time_mid, u2.time_mid);

    CHECK(u1.time_hi_and_version, u2.time_hi_and_version);

    CHECK(u1.clock_seq_hi_and_reserved, u2.clock_seq_hi_and_reserved);

    CHECK(u1.clock_seq_low, u2.clock_seq_low);

    for (i = 0; i < 6; i++)

    {

        if (u1.node[i] < u2.node[i])

            return -1;

        if (u1.node[i] > u2.node[i])

            return 1;

    }

    return 0;

}

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