Line data    Source code

       1             : /* File: data_uuid.c; Copyright and License: see below */
       2             : 
       3             : #include "u8stream/universal_simple_random.h"
       4             : #include "u8/u8_trace.h"
       5             : #include "u8/u8_log.h"
       6             : #include <time.h>
       7             : #include <assert.h>
       8             : 
       9             : #define data_uuid_unused(variable) ((void)(variable))
      10             : 
      11       13835 : static inline u8_error_t data_uuid_init ( data_uuid_t *this_, utf8string_t *uuid_string )
      12             : {
      13       13835 :     assert( NULL != uuid_string );
      14             :     utf8error_t strerr;
      15       13835 :     u8_error_t result = U8_ERROR_NONE;
      16             : 
      17       13835 :     (*this_).uuid_string = utf8stringbuf_init( sizeof((*this_).private_uuid_string_buffer),
      18       13835 :                                                (*this_).private_uuid_string_buffer
      19             :                                              );
      20       13835 :     strerr = utf8stringbuf_copy_str( (*this_).uuid_string, uuid_string );
      21       13835 :     if ( strerr != UTF8ERROR_SUCCESS )
      22             :     {
      23           5 :         U8_LOG_ERROR_INT( "utf8stringbuf_copy_str() failed:", strerr );
      24           5 :         result |= U8_ERROR_STRING_BUFFER_EXCEEDED;
      25             :     }
      26       13830 :     else if ( utf8stringbuf_get_length( (*this_).uuid_string ) != DATA_UUID_STRING_LENGTH )
      27             :     {
      28           5 :         U8_LOG_ERROR_INT( "uuid_string too short:", utf8stringbuf_get_length( (*this_).uuid_string ) );
      29           5 :         result |= U8_ERROR_VALUE_OUT_OF_RANGE;
      30             :     }
      31             : 
      32       13835 :     return result;
      33             : }
      34             : 
      35          64 : static inline u8_error_t data_uuid_reinit ( data_uuid_t *this_, utf8string_t *uuid_string )
      36             : {
      37          64 :     return data_uuid_init( this_, uuid_string );
      38             : }
      39             : 
      40        2731 : static inline void data_uuid_init_new ( data_uuid_t *this_ )
      41             : {
      42        2731 :     (*this_).uuid_string = utf8stringbuf_init( sizeof((*this_).private_uuid_string_buffer),
      43        2731 :                                                (*this_).private_uuid_string_buffer
      44             :                                              );
      45        2731 :     utf8stringbuf_clear( (*this_).uuid_string );
      46             : 
      47             :     /* Get current time to enrich the universal_random_t by additional entropy. */
      48             :     /* Otherwise the pseudo-random number only depends on the initial seed and number of samples already produced. */
      49        2731 :     clock_t now = clock();  /* integer represents clocks, to be divided by CLOCKS_PER_SEC */
      50             : 
      51             :     universal_simple_random_t rnd;
      52        2731 :     universal_simple_random_init( &rnd );
      53             :     {
      54        2731 :         utf8error_t strerr = UTF8ERROR_SUCCESS;
      55             : 
      56             :         assert( sizeof(int) >= sizeof(uint32_t) );
      57        2731 :         const uint32_t rand1 = now ^ universal_simple_random_get_uint32( &rnd );
      58        2731 :         const uint16_t rand2 = universal_simple_random_get_uint16( &rnd );
      59        2731 :         const uint16_t rand3 = (universal_simple_random_get_uint16( &rnd ) | 0x4000) & 0x4fff;  /* version 4 (4 bits) */
      60        2731 :         const uint16_t rand4 = (universal_simple_random_get_uint16( &rnd ) | 0x8000) & 0xbfff;  /* 2 reserved bits */
      61        2731 :         const uint16_t rand5 = universal_simple_random_get_uint16( &rnd );
      62        2731 :         const uint32_t rand6 = universal_simple_random_get_uint32( &rnd );
      63             : 
      64             :         char thirtyseven_bytes[DATA_UUID_STRING_LENGTH+1];
      65        2731 :         const int length = sprintf( &(thirtyseven_bytes[0]),
      66             :                                     "%08x-%04x-%04x-%04x-%04x%08x",
      67             :                                     rand1,
      68             :                                     rand2,
      69             :                                     rand3,
      70             :                                     rand4,
      71             :                                     rand5,
      72             :                                     rand6
      73             :                                   );
      74        2731 :         assert( length == sizeof(thirtyseven_bytes) - sizeof((const char)'\0') );
      75             :         data_uuid_unused( length );
      76        2731 :         strerr |= utf8stringbuf_append_str( (*this_).uuid_string, &(thirtyseven_bytes[0]) );
      77        2731 :         assert( strerr == UTF8ERROR_SUCCESS );
      78             :     }
      79        2731 :     universal_simple_random_destroy( &rnd );
      80        2731 : }
      81             : 
      82        1765 : static inline void data_uuid_copy ( data_uuid_t *this_, const data_uuid_t *original )
      83             : {
      84        1765 :     assert( NULL != original );
      85             : 
      86        1765 :     (*this_) = (*original);
      87             :     /* repair the overwritten pointers */
      88        1765 :     (*this_).uuid_string = utf8stringbuf_init( sizeof((*this_).private_uuid_string_buffer),
      89        1765 :                                                (*this_).private_uuid_string_buffer
      90             :                                              );
      91        1765 : }
      92             : 
      93         413 : static inline void data_uuid_replace ( data_uuid_t *this_, const data_uuid_t *that )
      94             : {
      95         413 :     assert( NULL != that );
      96             : 
      97         413 :     (*this_) = (*that);
      98             :     /* repair the overwritten pointers */
      99         413 :     (*this_).uuid_string = utf8stringbuf_init( sizeof((*this_).private_uuid_string_buffer),
     100         413 :                                                (*this_).private_uuid_string_buffer
     101             :                                              );
     102         413 : }
     103             : 
     104        5931 : static inline void data_uuid_destroy ( data_uuid_t *this_ )
     105             : {
     106        5931 : }
     107             : 
     108        4894 : static inline utf8string_t * data_uuid_get_string ( const data_uuid_t *this_ )
     109             : {
     110        4894 :     return utf8stringbuf_get_string( (*this_).uuid_string );
     111             : }
     112             : 
     113             : static inline void data_uuid_trace ( const data_uuid_t *this_ )
     114             : {
     115             :     U8_TRACE_INFO_STR( "data_uuid_t", utf8stringbuf_get_string( (*this_).uuid_string ) );
     116             : }
     117             : 
     118             : 
     119             : /*
     120             : Copyright 2021-2024 Andreas Warnke
     121             : 
     122             : Licensed under the Apache License, Version 2.0 (the "License");
     123             : you may not use this file except in compliance with the License.
     124             : You may obtain a copy of the License at
     125             : 
     126             :     http://www.apache.org/licenses/LICENSE-2.0
     127             : 
     128             : Unless required by applicable law or agreed to in writing, software
     129             : distributed under the License is distributed on an "AS IS" BASIS,
     130             : WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     131             : See the License for the specific language governing permissions and
     132             : limitations under the License.
     133             : */