/**************************************************************
 * 
 * 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
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 *************************************************************/


// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_sal.hxx"

#include <string.h>
#include <stdlib.h>

#include <osl/mutex.hxx>
#include <rtl/random.h>
#include <rtl/uuid.h>
#include <rtl/digest.h>

#define SWAP_INT32_TO_NETWORK(x)\
               { sal_uInt32 y = x;\
				 sal_uInt8 *p = (sal_uInt8 * )&(x); \
				 p[0] = (sal_uInt8) ( ( y >> 24 ) & 0xff );\
                 p[1] = (sal_uInt8) ( ( y >> 16 ) & 0xff );\
                 p[2] = (sal_uInt8) ( ( y >> 8 )  & 0xff );\
                 p[3] = (sal_uInt8) ( ( y ) & 0xff);\
               }
#define SWAP_INT16_TO_NETWORK(x)\
               { sal_uInt16 y = x;\
				 sal_uInt8 *p = (sal_uInt8 * )&(x); \
                 p[0] = (sal_uInt8) ( ( y >> 8 )  & 0xff );\
                 p[1] = (sal_uInt8) ( ( y ) & 0xff);\
               }

#define SWAP_NETWORK_TO_INT16(x)\
               { sal_uInt16 y = x;\
				 sal_uInt8 *p = (sal_uInt8 * )&(y);\
                 x = ( ( ((sal_uInt16)p[0]) & 0xff) << 8 ) |\
                     ( (  (sal_uInt16)p[1]) & 0xff);\
               }
#define SWAP_NETWORK_TO_INT32(x)\
               { sal_uInt32 y = x;\
				 sal_uInt8 *p = (sal_uInt8 * )&(y); \
                 x = ( ( ((sal_uInt32)p[0]) & 0xff) << 24 ) |\
                     ( ( ((sal_uInt32)p[1]) & 0xff) << 16 ) |\
                     ( ( ((sal_uInt32)p[2]) & 0xff) << 8  ) |\
                     ( (  (sal_uInt32)p[3]) & 0xff);\
               }

typedef 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];
} UUID;

static  void write_v3( sal_uInt8 *pUuid  )
{
    UUID uuid;
	// copy to avoid alignment problems
    memcpy( &uuid , pUuid , 16 );

	SWAP_NETWORK_TO_INT32( uuid.time_low );
	SWAP_NETWORK_TO_INT16( uuid.time_mid );
	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_INT32_TO_NETWORK( uuid.time_low );
	SWAP_INT16_TO_NETWORK( uuid.time_mid );
	SWAP_INT16_TO_NETWORK( uuid.time_hi_and_version );

	memcpy( pUuid , &uuid , 16 );
}


extern "C" void SAL_CALL rtl_createUuid( sal_uInt8 *pTargetUUID ,
                                         const sal_uInt8 *, sal_Bool )
{
    {
        osl::MutexGuard g(osl::Mutex::getGlobalMutex());
        static rtlRandomPool pool = NULL;
        if (pool == NULL) {
            pool = rtl_random_createPool();
            if (pool == NULL) {
                abort();
                    // only possible way to signal failure here (rtl_createUuid
                    // being part of a fixed C API)
            }
        }
        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;

}