src/library/int24.cpp

   1 #include "int24.hpp"
   2 #include <cstring>
   3
   4 ss_uint24_t::ss_uint24_t() throw()
   5 {
   6 }
   7
   8 ss_uint24_t::ss_uint24_t(uint32_t val) throw()
   9 {
  10         short magic = 256;
  11         memcpy(v, reinterpret_cast<char*>(&val) + *reinterpret_cast<char*>(&magic), 3);
  12 }
  13
  14 ss_uint24_t::operator uint32_t() const throw()
  15 {
  16         uint32_t val = 0;
  17         short magic = 256;
  18         memcpy(reinterpret_cast<char*>(&val) + *reinterpret_cast<char*>(&magic), v, 3);
  19         return val;
  20 }
  21
  22 ss_int24_t::ss_int24_t() throw()
  23 {
  24 }
  25
  26 ss_int24_t::ss_int24_t(int32_t val) throw()
  27 {
  28         short magic = 256;
  29         memcpy(v, reinterpret_cast<char*>(&val) + *reinterpret_cast<char*>(&magic), 3);
  30 }
  31
  32 ss_int24_t::ss_int24_t(const ss_uint24_t& val) throw()
  33 {
  34         memcpy(this, &val, 3);
  35 }
  36 ss_int24_t::operator int32_t() const throw()
  37 {
  38         int32_t val = 0;
  39         short magic = 256;
  40         memcpy(reinterpret_cast<char*>(&val) + *reinterpret_cast<char*>(&magic), v, 3);
  41         if(val & 0x800000)
  42                 val |= 0xFF000000U;
  43         return val;
  44 }
  45
  46 namespace
  47 {
  48         char assert1[(sizeof(ss_int24_t) == 3) ? 1 : -1];
  49         char assert2[(sizeof(ss_uint24_t) == 3) ? 1 : -1];
  50 }
  51
  52 void dummy_3263623632786738267323()
  53 {
  54         char* x = assert1;
  55         x[0] = 0;
  56         x = assert2;
  57         x[0] = 1;
  58 }