src/common/longlong.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/longlong.cpp
   3 // Purpose:     implementation of wxLongLongNative
   4 // Author:      Jeffrey C. Ollie <jeff@ollie.clive.ia.us>, Vadim Zeitlin
   5 // Remarks:     this class is not public in wxWindows 2.0! It is intentionally
   6 //              not documented and is for private use only.
   7 // Modified by:
   8 // Created:     10.02.99
   9 // RCS-ID:      $Id$
  10 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
  11 // Licence:     wxWindows licence
  12 /////////////////////////////////////////////////////////////////////////////
  13
  14 // ============================================================================
  15 // headers
  16 // ============================================================================
  17
  18 #ifdef __GNUG__
  19     #pragma implementation "longlong.h"
  20 #endif
  21
  22 #include "wx/wxprec.h"
  23
  24 #ifdef __BORLANDC__
  25     #pragma hdrstop
  26 #endif
  27
  28 #if wxUSE_LONGLONG
  29 #include "wx/longlong.h"
  30
  31 #if defined(__MWERKS__) && defined(__WXMSW__)
  32 #include <string.h>     // for memset()
  33 #else
  34 #include <memory.h>     // for memset()
  35 #endif
  36
  37 #include <math.h>       // for fabs()
  38
  39 // ============================================================================
  40 // implementation
  41 // ============================================================================
  42
  43 #if wxUSE_LONGLONG_NATIVE
  44
  45 // ----------------------------------------------------------------------------
  46 // misc
  47 // ----------------------------------------------------------------------------
  48
  49 void *wxLongLongNative::asArray() const
  50 {
  51     static unsigned char temp[8];
  52
  53     temp[0] = (m_ll >> 56) & 0xFF;
  54     temp[1] = (m_ll >> 48) & 0xFF;
  55     temp[2] = (m_ll >> 40) & 0xFF;
  56     temp[3] = (m_ll >> 32) & 0xFF;
  57     temp[4] = (m_ll >> 24) & 0xFF;
  58     temp[5] = (m_ll >> 16) & 0xFF;
  59     temp[6] = (m_ll >> 8)  & 0xFF;
  60     temp[7] = (m_ll >> 0)  & 0xFF;
  61
  62     return temp;
  63 }
  64
  65 void *wxULongLongNative::asArray() const
  66 {
  67     static unsigned char temp[8];
  68
  69     temp[0] = (m_ll >> 56) & 0xFF;
  70     temp[1] = (m_ll >> 48) & 0xFF;
  71     temp[2] = (m_ll >> 40) & 0xFF;
  72     temp[3] = (m_ll >> 32) & 0xFF;
  73     temp[4] = (m_ll >> 24) & 0xFF;
  74     temp[5] = (m_ll >> 16) & 0xFF;
  75     temp[6] = (m_ll >> 8)  & 0xFF;
  76     temp[7] = (m_ll >> 0)  & 0xFF;
  77
  78     return temp;
  79 }
  80
  81 #endif // wxUSE_LONGLONG_NATIVE
  82
  83 // ============================================================================
  84 // wxLongLongWx: emulation of 'long long' using 2 longs
  85 // ============================================================================
  86
  87 #if wxUSE_LONGLONG_WX
  88
  89 // assignment
  90 wxLongLongWx& wxLongLongWx::Assign(double d)
  91 {
  92     bool positive = d >= 0;
  93     d = fabs(d);
  94     if ( d <= ULONG_MAX )
  95     {
  96         m_hi = 0;
  97         m_lo = (long)d;
  98     }
  99     else
 100     {
 101         m_hi = (unsigned long)(d / (1.0 + (double)ULONG_MAX));
 102         m_lo = (unsigned long)(d - ((double)m_hi * (1.0 + (double)ULONG_MAX)));
 103     }
 104
 105 #ifdef wxLONGLONG_TEST_MODE
 106     m_ll = (wxLongLong_t)d;
 107
 108     Check();
 109 #endif // wxLONGLONG_TEST_MODE
 110
 111     if ( !positive )
 112         Negate();
 113
 114     return *this;
 115 }
 116
 117 wxLongLongWx wxLongLongWx::operator<<(int shift) const
 118 {
 119     wxLongLongWx ll(*this);
 120     ll <<= shift;
 121
 122     return ll;
 123 }
 124
 125 wxULongLongWx wxULongLongWx::operator<<(int shift) const
 126 {
 127     wxULongLongWx ll(*this);
 128     ll <<= shift;
 129
 130     return ll;
 131 }
 132
 133 wxLongLongWx& wxLongLongWx::operator<<=(int shift)
 134 {
 135     if (shift != 0)
 136     {
 137         if (shift < 32)
 138         {
 139             m_hi <<= shift;
 140             m_hi |= m_lo >> (32 - shift);
 141             m_lo <<= shift;
 142         }
 143         else
 144         {
 145             m_hi = m_lo << (shift - 32);
 146             m_lo = 0;
 147         }
 148     }
 149
 150 #ifdef wxLONGLONG_TEST_MODE
 151     m_ll <<= shift;
 152
 153     Check();
 154 #endif // wxLONGLONG_TEST_MODE
 155
 156     return *this;
 157 }
 158
 159 wxULongLongWx& wxULongLongWx::operator<<=(int shift)
 160 {
 161     if (shift != 0)
 162     {
 163         if (shift < 32)
 164         {
 165             m_hi <<= shift;
 166             m_hi |= m_lo >> (32 - shift);
 167             m_lo <<= shift;
 168         }
 169         else
 170         {
 171             m_hi = m_lo << (shift - 32);
 172             m_lo = 0;
 173         }
 174     }
 175
 176 #ifdef wxLONGLONG_TEST_MODE
 177     m_ll <<= shift;
 178
 179     Check();
 180 #endif // wxLONGLONG_TEST_MODE
 181
 182     return *this;
 183 }
 184
 185 wxLongLongWx wxLongLongWx::operator>>(int shift) const
 186 {
 187     wxLongLongWx ll(*this);
 188     ll >>= shift;
 189
 190     return ll;
 191 }
 192
 193 wxULongLongWx wxULongLongWx::operator>>(int shift) const
 194 {
 195     wxULongLongWx ll(*this);
 196     ll >>= shift;
 197
 198     return ll;
 199 }
 200
 201 wxLongLongWx& wxLongLongWx::operator>>=(int shift)
 202 {
 203     if (shift != 0)
 204     {
 205         if (shift < 32)
 206         {
 207             m_lo >>= shift;
 208             m_lo |= m_hi << (32 - shift);
 209             m_hi >>= shift;
 210         }
 211         else
 212         {
 213             m_lo = m_hi >> (shift - 32);
 214             m_hi = (m_hi < 0 ? -1L : 0);
 215         }
 216     }
 217
 218 #ifdef wxLONGLONG_TEST_MODE
 219     m_ll >>= shift;
 220
 221     Check();
 222 #endif // wxLONGLONG_TEST_MODE
 223
 224     return *this;
 225 }
 226
 227 wxULongLongWx& wxULongLongWx::operator>>=(int shift)
 228 {
 229     if (shift != 0)
 230     {
 231         if (shift < 32)
 232         {
 233             m_lo >>= shift;
 234             m_lo |= m_hi << (32 - shift);
 235             m_hi >>= shift;
 236         }
 237         else
 238         {
 239             m_lo = m_hi >> (shift - 32);
 240             m_hi = 0;
 241         }
 242     }
 243
 244 #ifdef wxLONGLONG_TEST_MODE
 245     m_ll >>= shift;
 246
 247     Check();
 248 #endif // wxLONGLONG_TEST_MODE
 249
 250     return *this;
 251 }
 252
 253 wxLongLongWx wxLongLongWx::operator+(const wxLongLongWx& ll) const
 254 {
 255     wxLongLongWx res(*this);
 256     res += ll;
 257
 258     return res;
 259 }
 260
 261 wxULongLongWx wxULongLongWx::operator+(const wxULongLongWx& ll) const
 262 {
 263     wxULongLongWx res(*this);
 264     res += ll;
 265
 266     return res;
 267 }
 268
 269 wxLongLongWx wxLongLongWx::operator+(long l) const
 270 {
 271     wxLongLongWx res(*this);
 272     res += l;
 273
 274     return res;
 275 }
 276
 277 wxULongLongWx wxULongLongWx::operator+(unsigned long l) const
 278 {
 279     wxULongLongWx res(*this);
 280     res += l;
 281
 282     return res;
 283 }
 284
 285 wxLongLongWx& wxLongLongWx::operator+=(const wxLongLongWx& ll)
 286 {
 287     unsigned long previous = m_lo;
 288
 289     m_lo += ll.m_lo;
 290     m_hi += ll.m_hi;
 291
 292     if ((m_lo < previous) || (m_lo < ll.m_lo))
 293         m_hi++;
 294
 295 #ifdef wxLONGLONG_TEST_MODE
 296     m_ll += ll.m_ll;
 297
 298     Check();
 299 #endif // wxLONGLONG_TEST_MODE
 300
 301     return *this;
 302 }
 303
 304 wxULongLongWx& wxULongLongWx::operator+=(const wxULongLongWx& ll)
 305 {
 306     unsigned long previous = m_lo;
 307
 308     m_lo += ll.m_lo;
 309     m_hi += ll.m_hi;
 310
 311     if ((m_lo < previous) || (m_lo < ll.m_lo))
 312         m_hi++;
 313
 314 #ifdef wxLONGLONG_TEST_MODE
 315     m_ll += ll.m_ll;
 316
 317     Check();
 318 #endif // wxLONGLONG_TEST_MODE
 319
 320     return *this;
 321 }
 322
 323 wxLongLongWx& wxLongLongWx::operator+=(long l)
 324 {
 325     unsigned long previous = m_lo;
 326
 327     m_lo += l;
 328     if (l < 0)
 329         m_hi += -1l;
 330
 331     if ((m_lo < previous) || (m_lo < (unsigned long)l))
 332         m_hi++;
 333
 334 #ifdef wxLONGLONG_TEST_MODE
 335     m_ll += l;
 336
 337     Check();
 338 #endif // wxLONGLONG_TEST_MODE
 339
 340     return *this;
 341 }
 342
 343 wxULongLongWx& wxULongLongWx::operator+=(unsigned long l)
 344 {
 345     unsigned long previous = m_lo;
 346
 347     m_lo += l;
 348
 349     if ((m_lo < previous) || (m_lo < l))
 350         m_hi++;
 351
 352 #ifdef wxLONGLONG_TEST_MODE
 353     m_ll += l;
 354
 355     Check();
 356 #endif // wxLONGLONG_TEST_MODE
 357
 358     return *this;
 359 }
 360
 361 // pre increment
 362 wxLongLongWx& wxLongLongWx::operator++()
 363 {
 364     m_lo++;
 365     if (m_lo == 0)
 366         m_hi++;
 367
 368 #ifdef wxLONGLONG_TEST_MODE
 369     m_ll++;
 370
 371     Check();
 372 #endif // wxLONGLONG_TEST_MODE
 373
 374     return *this;
 375 }
 376
 377 wxULongLongWx& wxULongLongWx::operator++()
 378 {
 379     m_lo++;
 380     if (m_lo == 0)
 381         m_hi++;
 382
 383 #ifdef wxLONGLONG_TEST_MODE
 384     m_ll++;
 385
 386     Check();
 387 #endif // wxLONGLONG_TEST_MODE
 388
 389     return *this;
 390 }
 391
 392 // negation
 393 wxLongLongWx wxLongLongWx::operator-() const
 394 {
 395     wxLongLongWx res(*this);
 396     res.Negate();
 397
 398     return res;
 399 }
 400
 401 wxLongLongWx& wxLongLongWx::Negate()
 402 {
 403     m_hi = ~m_hi;
 404     m_lo = ~m_lo;
 405
 406     m_lo++;
 407     if ( m_lo == 0 )
 408         m_hi++;
 409
 410 #ifdef wxLONGLONG_TEST_MODE
 411     m_ll = -m_ll;
 412
 413     Check();
 414 #endif // wxLONGLONG_TEST_MODE
 415
 416     return *this;
 417 }
 418
 419 // subtraction
 420
 421 wxLongLongWx wxLongLongWx::operator-(const wxLongLongWx& ll) const
 422 {
 423     wxLongLongWx res(*this);
 424     res -= ll;
 425
 426     return res;
 427 }
 428
 429 wxULongLongWx wxULongLongWx::operator-(const wxULongLongWx& ll) const
 430 {
 431     wxULongLongWx res(*this);
 432     res -= ll;
 433
 434     return res;
 435 }
 436
 437 wxLongLongWx& wxLongLongWx::operator-=(const wxLongLongWx& ll)
 438 {
 439     unsigned long previous = m_lo;
 440
 441     m_lo -= ll.m_lo;
 442     m_hi -= ll.m_hi;
 443
 444     if (previous < ll.m_lo)
 445         m_hi--;
 446
 447 #ifdef wxLONGLONG_TEST_MODE
 448     m_ll -= ll.m_ll;
 449
 450     Check();
 451 #endif // wxLONGLONG_TEST_MODE
 452
 453     return *this;
 454 }
 455
 456 wxULongLongWx& wxULongLongWx::operator-=(const wxULongLongWx& ll)
 457 {
 458     unsigned long previous = m_lo;
 459
 460     m_lo -= ll.m_lo;
 461     m_hi -= ll.m_hi;
 462
 463     if (previous < ll.m_lo)
 464         m_hi--;
 465
 466 #ifdef wxLONGLONG_TEST_MODE
 467     m_ll -= ll.m_ll;
 468
 469     Check();
 470 #endif // wxLONGLONG_TEST_MODE
 471
 472     return *this;
 473 }
 474
 475 // pre decrement
 476 wxLongLongWx& wxLongLongWx::operator--()
 477 {
 478     m_lo--;
 479     if (m_lo == 0xFFFFFFFF)
 480         m_hi--;
 481
 482 #ifdef wxLONGLONG_TEST_MODE
 483     m_ll--;
 484
 485     Check();
 486 #endif // wxLONGLONG_TEST_MODE
 487
 488     return *this;
 489 }
 490
 491 wxULongLongWx& wxULongLongWx::operator--()
 492 {
 493     m_lo--;
 494     if (m_lo == 0xFFFFFFFF)
 495         m_hi--;
 496
 497 #ifdef wxLONGLONG_TEST_MODE
 498     m_ll--;
 499
 500     Check();
 501 #endif // wxLONGLONG_TEST_MODE
 502
 503     return *this;
 504 }
 505
 506 // comparison operators
 507
 508 bool wxLongLongWx::operator<(const wxLongLongWx& ll) const
 509 {
 510     if ( m_hi < ll.m_hi )
 511         return TRUE;
 512     else if ( m_hi == ll.m_hi )
 513         return m_lo < ll.m_lo;
 514     else
 515         return FALSE;
 516 }
 517
 518 bool wxULongLongWx::operator<(const wxULongLongWx& ll) const
 519 {
 520     if ( m_hi < ll.m_hi )
 521         return TRUE;
 522     else if ( m_hi == ll.m_hi )
 523         return m_lo < ll.m_lo;
 524     else
 525         return FALSE;
 526 }
 527
 528 bool wxLongLongWx::operator>(const wxLongLongWx& ll) const
 529 {
 530     if ( m_hi > ll.m_hi )
 531         return TRUE;
 532     else if ( m_hi == ll.m_hi )
 533         return m_lo > ll.m_lo;
 534     else
 535         return FALSE;
 536 }
 537
 538 bool wxULongLongWx::operator>(const wxULongLongWx& ll) const
 539 {
 540     if ( m_hi > ll.m_hi )
 541         return TRUE;
 542     else if ( m_hi == ll.m_hi )
 543         return m_lo > ll.m_lo;
 544     else
 545         return FALSE;
 546 }
 547
 548 // bitwise operators
 549
 550 wxLongLongWx wxLongLongWx::operator&(const wxLongLongWx& ll) const
 551 {
 552     return wxLongLongWx(m_hi & ll.m_hi, m_lo & ll.m_lo);
 553 }
 554
 555 wxULongLongWx wxULongLongWx::operator&(const wxULongLongWx& ll) const
 556 {
 557     return wxULongLongWx(m_hi & ll.m_hi, m_lo & ll.m_lo);
 558 }
 559
 560 wxLongLongWx wxLongLongWx::operator|(const wxLongLongWx& ll) const
 561 {
 562     return wxLongLongWx(m_hi | ll.m_hi, m_lo | ll.m_lo);
 563 }
 564
 565 wxULongLongWx wxULongLongWx::operator|(const wxULongLongWx& ll) const
 566 {
 567     return wxULongLongWx(m_hi | ll.m_hi, m_lo | ll.m_lo);
 568 }
 569
 570 wxLongLongWx wxLongLongWx::operator^(const wxLongLongWx& ll) const
 571 {
 572     return wxLongLongWx(m_hi ^ ll.m_hi, m_lo ^ ll.m_lo);
 573 }
 574
 575 wxULongLongWx wxULongLongWx::operator^(const wxULongLongWx& ll) const
 576 {
 577     return wxULongLongWx(m_hi ^ ll.m_hi, m_lo ^ ll.m_lo);
 578 }
 579
 580 wxLongLongWx& wxLongLongWx::operator&=(const wxLongLongWx& ll)
 581 {
 582     m_lo &= ll.m_lo;
 583     m_hi &= ll.m_hi;
 584
 585 #ifdef wxLONGLONG_TEST_MODE
 586     m_ll &= ll.m_ll;
 587
 588     Check();
 589 #endif // wxLONGLONG_TEST_MODE
 590
 591     return *this;
 592 }
 593
 594 wxULongLongWx& wxULongLongWx::operator&=(const wxULongLongWx& ll)
 595 {
 596     m_lo &= ll.m_lo;
 597     m_hi &= ll.m_hi;
 598
 599 #ifdef wxLONGLONG_TEST_MODE
 600     m_ll &= ll.m_ll;
 601
 602     Check();
 603 #endif // wxLONGLONG_TEST_MODE
 604
 605     return *this;
 606 }
 607
 608 wxLongLongWx& wxLongLongWx::operator|=(const wxLongLongWx& ll)
 609 {
 610     m_lo |= ll.m_lo;
 611     m_hi |= ll.m_hi;
 612
 613 #ifdef wxLONGLONG_TEST_MODE
 614     m_ll |= ll.m_ll;
 615
 616     Check();
 617 #endif // wxLONGLONG_TEST_MODE
 618
 619     return *this;
 620 }
 621
 622 wxULongLongWx& wxULongLongWx::operator|=(const wxULongLongWx& ll)
 623 {
 624     m_lo |= ll.m_lo;
 625     m_hi |= ll.m_hi;
 626
 627 #ifdef wxLONGLONG_TEST_MODE
 628     m_ll |= ll.m_ll;
 629
 630     Check();
 631 #endif // wxLONGLONG_TEST_MODE
 632
 633     return *this;
 634 }
 635
 636 wxLongLongWx& wxLongLongWx::operator^=(const wxLongLongWx& ll)
 637 {
 638     m_lo ^= ll.m_lo;
 639     m_hi ^= ll.m_hi;
 640
 641 #ifdef wxLONGLONG_TEST_MODE
 642     m_ll ^= ll.m_ll;
 643
 644     Check();
 645 #endif // wxLONGLONG_TEST_MODE
 646
 647     return *this;
 648 }
 649
 650 wxULongLongWx& wxULongLongWx::operator^=(const wxULongLongWx& ll)
 651 {
 652     m_lo ^= ll.m_lo;
 653     m_hi ^= ll.m_hi;
 654
 655 #ifdef wxLONGLONG_TEST_MODE
 656     m_ll ^= ll.m_ll;
 657
 658     Check();
 659 #endif // wxLONGLONG_TEST_MODE
 660
 661     return *this;
 662 }
 663
 664 wxLongLongWx wxLongLongWx::operator~() const
 665 {
 666     return wxLongLongWx(~m_hi, ~m_lo);
 667 }
 668
 669 wxULongLongWx wxULongLongWx::operator~() const
 670 {
 671     return wxULongLongWx(~m_hi, ~m_lo);
 672 }
 673
 674 // multiplication
 675
 676 wxLongLongWx wxLongLongWx::operator*(const wxLongLongWx& ll) const
 677 {
 678     wxLongLongWx res(*this);
 679     res *= ll;
 680
 681     return res;
 682 }
 683
 684 wxULongLongWx wxULongLongWx::operator*(const wxULongLongWx& ll) const
 685 {
 686     wxULongLongWx res(*this);
 687     res *= ll;
 688
 689     return res;
 690 }
 691
 692 wxLongLongWx& wxLongLongWx::operator*=(const wxLongLongWx& ll)
 693 {
 694     wxLongLongWx t(m_hi, m_lo);
 695     wxLongLongWx q(ll.m_hi, ll.m_lo);
 696
 697     m_hi = m_lo = 0;
 698
 699 #ifdef wxLONGLONG_TEST_MODE
 700     wxLongLong_t llOld = m_ll;
 701     m_ll = 0;
 702 #endif // wxLONGLONG_TEST_MODE
 703
 704     int counter = 0;
 705     do
 706     {
 707         if ((q.m_lo & 1) != 0)
 708             *this += t;
 709         q >>= 1;
 710         t <<= 1;
 711         counter++;
 712     }
 713     while ((counter < 64) && ((q.m_hi != 0) || (q.m_lo != 0)));
 714
 715 #ifdef wxLONGLONG_TEST_MODE
 716     m_ll = llOld * ll.m_ll;
 717
 718     Check();
 719 #endif // wxLONGLONG_TEST_MODE
 720
 721     return *this;
 722 }
 723
 724 wxULongLongWx& wxULongLongWx::operator*=(const wxULongLongWx& ll)
 725 {
 726     wxULongLongWx t(m_hi, m_lo);
 727     wxULongLongWx q(ll.m_hi, ll.m_lo);
 728
 729     m_hi = m_lo = 0;
 730
 731 #ifdef wxLONGLONG_TEST_MODE
 732     unsigned wxLongLong_t llOld = m_ll;
 733     m_ll = 0;
 734 #endif // wxLONGLONG_TEST_MODE
 735
 736     int counter = 0;
 737     do
 738     {
 739         if ((q.m_lo & 1) != 0)
 740             *this += t;
 741         q >>= 1;
 742         t <<= 1;
 743         counter++;
 744     }
 745     while ((counter < 64) && ((q.m_hi != 0) || (q.m_lo != 0)));
 746
 747 #ifdef wxLONGLONG_TEST_MODE
 748     m_ll = llOld * ll.m_ll;
 749
 750     Check();
 751 #endif // wxLONGLONG_TEST_MODE
 752
 753     return *this;
 754 }
 755
 756 // division
 757
 758 void wxLongLongWx::Divide(const wxLongLongWx& divisorIn,
 759                           wxLongLongWx& quotient,
 760                           wxLongLongWx& remainder) const
 761 {
 762     if ((divisorIn.m_lo == 0) && (divisorIn.m_hi == 0))
 763     {
 764         // provoke division by zero error and silence the compilers warnings
 765         // about an expression without effect and unused variable
 766         long dummy = divisorIn.m_lo/divisorIn.m_hi;
 767         dummy += 0;
 768     }
 769
 770     // VZ: I'm writing this in a hurry and it's surely not the fastest way to
 771     //     do this - any improvements are more than welcome
 772     //
 773     //     code inspired by the snippet at
 774     //          http://www.bearcave.com/software/divide.htm
 775     //
 776     //     Copyright notice:
 777     //
 778     //     Use of this program, for any purpose, is granted the author, Ian
 779     //     Kaplan, as long as this copyright notice is included in the source
 780     //     code or any source code derived from this program. The user assumes
 781     //     all responsibility for using this code.
 782
 783     // init everything
 784     wxLongLongWx dividend = *this,
 785                  divisor = divisorIn;
 786
 787     quotient = 0l;
 788     remainder = 0l;
 789
 790     // always do unsigned division and adjust the signs later: in C integer
 791     // division, the sign of the remainder is the same as the sign of the
 792     // dividend, while the sign of the quotient is the product of the signs of
 793     // the dividend and divisor. Of course, we also always have
 794     //
 795     //      dividend = quotient*divisor + remainder
 796     //
 797     // with 0 <= abs(remainder) < abs(divisor)
 798     bool negRemainder = dividend.m_hi < 0;
 799     bool negQuotient = FALSE;   // assume positive
 800     if ( dividend.m_hi < 0 )
 801     {
 802         negQuotient = !negQuotient;
 803         dividend = -dividend;
 804     }
 805     if ( divisor.m_hi < 0 )
 806     {
 807         negQuotient = !negQuotient;
 808         divisor = -divisor;
 809     }
 810
 811     // check for some particular cases
 812     if ( divisor > dividend )
 813     {
 814         remainder = dividend;
 815     }
 816     else if ( divisor == dividend )
 817     {
 818         quotient = 1l;
 819     }
 820     else
 821     {
 822         // here: dividend > divisor and both are positibe: do unsigned division
 823         size_t nBits = 64u;
 824         wxLongLongWx d;
 825
 826         #define IS_MSB_SET(ll)  ((ll.m_hi) & (1 << (8*sizeof(long) - 1)))
 827
 828         while ( remainder < divisor )
 829         {
 830             remainder <<= 1;
 831             if ( IS_MSB_SET(dividend) )
 832             {
 833                 remainder |= 1;
 834             }
 835
 836             d = dividend;
 837             dividend <<= 1;
 838
 839             nBits--;
 840         }
 841
 842         // undo the last loop iteration
 843         dividend = d;
 844         remainder >>= 1;
 845         nBits++;
 846
 847         for ( size_t i = 0; i < nBits; i++ )
 848         {
 849             remainder <<= 1;
 850             if ( IS_MSB_SET(dividend) )
 851             {
 852                 remainder |= 1;
 853             }
 854
 855             wxLongLongWx t = remainder - divisor;
 856             dividend <<= 1;
 857             quotient <<= 1;
 858             if ( !IS_MSB_SET(t) )
 859             {
 860                 quotient |= 1;
 861
 862                 remainder = t;
 863             }
 864         }
 865     }
 866
 867     // adjust signs
 868     if ( negRemainder )
 869     {
 870         remainder = -remainder;
 871     }
 872
 873     if ( negQuotient )
 874     {
 875         quotient = -quotient;
 876     }
 877 }
 878
 879 void wxULongLongWx::Divide(const wxULongLongWx& divisorIn,
 880                            wxULongLongWx& quotient,
 881                            wxULongLongWx& remainder) const
 882 {
 883     if ((divisorIn.m_lo == 0) && (divisorIn.m_hi == 0))
 884     {
 885         // provoke division by zero error and silence the compilers warnings
 886         // about an expression without effect and unused variable
 887         unsigned long dummy = divisorIn.m_lo/divisorIn.m_hi;
 888         dummy += 0;
 889     }
 890
 891     // VZ: I'm writing this in a hurry and it's surely not the fastest way to
 892     //     do this - any improvements are more than welcome
 893     //
 894     //     code inspired by the snippet at
 895     //          http://www.bearcave.com/software/divide.htm
 896     //
 897     //     Copyright notice:
 898     //
 899     //     Use of this program, for any purpose, is granted the author, Ian
 900     //     Kaplan, as long as this copyright notice is included in the source
 901     //     code or any source code derived from this program. The user assumes
 902     //     all responsibility for using this code.
 903
 904     // init everything
 905     wxULongLongWx dividend = *this,
 906                   divisor = divisorIn;
 907
 908     quotient = 0l;
 909     remainder = 0l;
 910
 911     // check for some particular cases
 912     if ( divisor > dividend )
 913     {
 914         remainder = dividend;
 915     }
 916     else if ( divisor == dividend )
 917     {
 918         quotient = 1l;
 919     }
 920     else
 921     {
 922         // here: dividend > divisor
 923         size_t nBits = 64u;
 924         wxULongLongWx d;
 925
 926         #define IS_MSB_SET(ll)  ((ll.m_hi) & (1 << (8*sizeof(long) - 1)))
 927
 928         while ( remainder < divisor )
 929         {
 930             remainder <<= 1;
 931             if ( IS_MSB_SET(dividend) )
 932             {
 933                 remainder |= 1;
 934             }
 935
 936             d = dividend;
 937             dividend <<= 1;
 938
 939             nBits--;
 940         }
 941
 942         // undo the last loop iteration
 943         dividend = d;
 944         remainder >>= 1;
 945         nBits++;
 946
 947         for ( size_t i = 0; i < nBits; i++ )
 948         {
 949             remainder <<= 1;
 950             if ( IS_MSB_SET(dividend) )
 951             {
 952                 remainder |= 1;
 953             }
 954
 955             wxULongLongWx t = remainder - divisor;
 956             dividend <<= 1;
 957             quotient <<= 1;
 958             if ( !IS_MSB_SET(t) )
 959             {
 960                 quotient |= 1;
 961
 962                 remainder = t;
 963             }
 964         }
 965     }
 966 }
 967
 968 wxLongLongWx wxLongLongWx::operator/(const wxLongLongWx& ll) const
 969 {
 970     wxLongLongWx quotient, remainder;
 971
 972     Divide(ll, quotient, remainder);
 973
 974     return quotient;
 975 }
 976
 977 wxULongLongWx wxULongLongWx::operator/(const wxULongLongWx& ll) const
 978 {
 979     wxULongLongWx quotient, remainder;
 980
 981     Divide(ll, quotient, remainder);
 982
 983     return quotient;
 984 }
 985
 986 wxLongLongWx& wxLongLongWx::operator/=(const wxLongLongWx& ll)
 987 {
 988     wxLongLongWx quotient, remainder;
 989
 990     Divide(ll, quotient, remainder);
 991
 992     *this = quotient;
 993
 994     return *this;
 995 }
 996
 997 wxULongLongWx& wxULongLongWx::operator/=(const wxULongLongWx& ll)
 998 {
 999     wxULongLongWx quotient, remainder;
1000
1001     Divide(ll, quotient, remainder);
1002
1003     *this = quotient;
1004
1005     return *this;
1006 }
1007
1008 wxLongLongWx wxLongLongWx::operator%(const wxLongLongWx& ll) const
1009 {
1010     wxLongLongWx quotient, remainder;
1011
1012     Divide(ll, quotient, remainder);
1013
1014     return remainder;
1015 }
1016
1017 wxULongLongWx wxULongLongWx::operator%(const wxULongLongWx& ll) const
1018 {
1019     wxULongLongWx quotient, remainder;
1020
1021     Divide(ll, quotient, remainder);
1022
1023     return remainder;
1024 }
1025
1026 // ----------------------------------------------------------------------------
1027 // misc
1028 // ----------------------------------------------------------------------------
1029
1030 // temporary - just for testing
1031 void *wxLongLongWx::asArray(void) const
1032 {
1033     static unsigned char temp[8];
1034
1035     temp[0] = (char)((m_hi >> 24) & 0xFF);
1036     temp[1] = (char)((m_hi >> 16) & 0xFF);
1037     temp[2] = (char)((m_hi >> 8)  & 0xFF);
1038     temp[3] = (char)((m_hi >> 0)  & 0xFF);
1039     temp[4] = (char)((m_lo >> 24) & 0xFF);
1040     temp[5] = (char)((m_lo >> 16) & 0xFF);
1041     temp[6] = (char)((m_lo >> 8)  & 0xFF);
1042     temp[7] = (char)((m_lo >> 0)  & 0xFF);
1043
1044     return temp;
1045 }
1046
1047 void *wxULongLongWx::asArray(void) const
1048 {
1049     static unsigned char temp[8];
1050
1051     temp[0] = (char)((m_hi >> 24) & 0xFF);
1052     temp[1] = (char)((m_hi >> 16) & 0xFF);
1053     temp[2] = (char)((m_hi >> 8)  & 0xFF);
1054     temp[3] = (char)((m_hi >> 0)  & 0xFF);
1055     temp[4] = (char)((m_lo >> 24) & 0xFF);
1056     temp[5] = (char)((m_lo >> 16) & 0xFF);
1057     temp[6] = (char)((m_lo >> 8)  & 0xFF);
1058     temp[7] = (char)((m_lo >> 0)  & 0xFF);
1059
1060     return temp;
1061 }
1062
1063 #endif // wxUSE_LONGLONG_WX
1064
1065 wxString
1066 #if wxUSE_LONGLONG_NATIVE
1067 wxLongLongNative::ToString() const
1068 #else
1069 wxLongLongWx::ToString() const
1070 #endif
1071 {
1072     // TODO: this is awfully inefficient, anything better?
1073     wxString result;
1074
1075     wxLongLong ll = *this;
1076
1077     bool neg;
1078     if ( ll < 0 )
1079     {
1080         ll.Negate();
1081         neg = TRUE;
1082     }
1083     else
1084     {
1085         neg = FALSE;
1086     }
1087
1088     while ( ll != 0 )
1089     {
1090         result.Prepend((wxChar)(_T('0') + (ll % 10).ToLong()));
1091         ll /= 10;
1092     }
1093
1094     if ( result.empty() )
1095         result = _T('0');
1096     else if ( neg )
1097         result.Prepend(_T('-'));
1098
1099     return result;
1100 }
1101
1102 wxString
1103 #if wxUSE_LONGLONG_NATIVE
1104 wxULongLongNative::ToString() const
1105 #else
1106 wxULongLongWx::ToString() const
1107 #endif
1108 {
1109     // TODO: this is awfully inefficient, anything better?
1110     wxString result;
1111
1112     wxULongLong ll = *this;
1113
1114     while ( ll != 0 )
1115     {
1116         result.Prepend((wxChar)(_T('0') + (ll % 10).ToULong()));
1117         ll /= 10;
1118     }
1119
1120     if ( result.empty() )
1121         result = _T('0');
1122
1123     return result;
1124 }
1125
1126 #if wxUSE_STD_IOSTREAM
1127
1128 // input/output
1129 wxSTD ostream& operator<< (wxSTD ostream& o, const wxLongLong& ll)
1130 {
1131     return o << ll.ToString();
1132 }
1133
1134 wxSTD ostream& operator<< (wxSTD ostream& o, const wxULongLong& ll)
1135 {
1136     return o << ll.ToString();
1137 }
1138
1139 #endif // wxUSE_STD_IOSTREAM
1140
1141 #endif // wxUSE_LONGLONG