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/* -*- 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 <mutex>
#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)
{
{
static rtlRandomPool pool = []() {
rtlRandomPool aPool = rtl_random_createPool();
if (!aPool)
{
abort();
// only possible way to signal failure here (rtl_createUuid
// being part of a fixed C API)
}
return aPool;
}();
static std::mutex aMutex;
std::scoped_lock g(aMutex);
if (rtl_random_getBytes(pool, 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;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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