src/common/stream.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        stream.cpp
   3 // Purpose:     wxStream base classes
   4 // Author:      Guilhem Lavaux
   5 // Modified by:
   6 // Created:     11/07/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Guilhem Lavaux
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13 #pragma implementation "stream.h"
  14 #endif
  15
  16 // For compilers that support precompilation, includes "wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #ifdef __BORLANDC__
  20   #pragma hdrstop
  21 #endif
  22
  23 #ifndef WX_PRECOMP
  24   #include "wx/defs.h"
  25 #endif
  26
  27 #if wxUSE_STREAMS
  28
  29 #include <ctype.h>
  30 #include <wx/stream.h>
  31 #include <wx/datstrm.h>
  32 #include <wx/objstrm.h>
  33
  34 #define BUF_TEMP_SIZE 10000
  35
  36 // ----------------------------------------------------------------------------
  37 // wxStreamBuffer
  38 // ----------------------------------------------------------------------------
  39
  40 #define CHECK_ERROR(err) \
  41    if (m_stream->m_lasterror == wxStream_NOERROR) \
  42      m_stream->m_lasterror = err
  43
  44 wxStreamBuffer::wxStreamBuffer(wxStreamBase& stream, BufMode mode)
  45   : m_buffer_start(NULL), m_buffer_end(NULL), m_buffer_pos(NULL),
  46     m_buffer_size(0), m_fixed(TRUE), m_flushable(TRUE), m_stream(&stream),
  47     m_mode(mode), m_destroybuf(FALSE), m_destroystream(FALSE)
  48 {
  49 }
  50
  51 wxStreamBuffer::wxStreamBuffer(BufMode mode)
  52   : m_buffer_start(NULL), m_buffer_end(NULL), m_buffer_pos(NULL),
  53     m_buffer_size(0), m_fixed(TRUE), m_flushable(FALSE), m_stream(NULL),
  54     m_mode(mode), m_destroybuf(FALSE), m_destroystream(TRUE)
  55 {
  56   m_stream = new wxStreamBase();
  57 }
  58
  59 wxStreamBuffer::wxStreamBuffer(const wxStreamBuffer& buffer)
  60 {
  61   m_buffer_start = buffer.m_buffer_start;
  62   m_buffer_end = buffer.m_buffer_end;
  63   m_buffer_pos = buffer.m_buffer_pos;
  64   m_buffer_size = buffer.m_buffer_size;
  65   m_fixed = buffer.m_fixed;
  66   m_flushable = buffer.m_flushable;
  67   m_stream = buffer.m_stream;
  68   m_mode = buffer.m_mode;
  69   m_destroybuf = FALSE;
  70   m_destroystream = FALSE;
  71 }
  72
  73 wxStreamBuffer::~wxStreamBuffer()
  74 {
  75   if (m_destroybuf)
  76     wxDELETEA(m_buffer_start);
  77   if (m_destroystream)
  78     delete m_stream;
  79 }
  80
  81 void wxStreamBuffer::SetBufferIO(char *buffer_start, char *buffer_end)
  82 {
  83   if (m_destroybuf)
  84     wxDELETEA(m_buffer_start);
  85   m_buffer_start = buffer_start;
  86   m_buffer_end   = buffer_end;
  87
  88   m_buffer_size = m_buffer_end-m_buffer_start;
  89   m_destroybuf = FALSE;
  90   ResetBuffer();
  91 }
  92
  93 void wxStreamBuffer::SetBufferIO(size_t bufsize)
  94 {
  95   char *b_start;
  96
  97   if (m_destroybuf)
  98     wxDELETEA(m_buffer_start);
  99
 100   if (!bufsize) {
 101     m_buffer_start = NULL;
 102     m_buffer_end = NULL;
 103     m_buffer_pos = NULL;
 104     m_buffer_size = 0;
 105     return;
 106   }
 107
 108   b_start = new char[bufsize];
 109   SetBufferIO(b_start, b_start + bufsize);
 110   m_destroybuf = TRUE;
 111 }
 112
 113 void wxStreamBuffer::ResetBuffer()
 114 {
 115   m_stream->m_lasterror = wxStream_NOERROR;
 116   m_stream->m_lastcount = 0;
 117   if (m_mode == read)
 118     m_buffer_pos = m_buffer_end;
 119   else
 120     m_buffer_pos = m_buffer_start;
 121 }
 122
 123 bool wxStreamBuffer::FillBuffer()
 124 {
 125   size_t count;
 126
 127   count = m_stream->OnSysRead(m_buffer_start, m_buffer_size);
 128   m_buffer_end = m_buffer_start+count;
 129   m_buffer_pos = m_buffer_start;
 130
 131   if (count == 0)
 132     return FALSE;
 133   return TRUE;
 134 }
 135
 136 bool wxStreamBuffer::FlushBuffer()
 137 {
 138   size_t count, current;
 139
 140   if (m_buffer_pos == m_buffer_start || !m_flushable)
 141     return FALSE;
 142
 143   current = m_buffer_pos-m_buffer_start;
 144   count = m_stream->OnSysWrite(m_buffer_start, current);
 145   if (count != current)
 146     return FALSE;
 147   m_buffer_pos = m_buffer_start;
 148
 149   return TRUE;
 150 }
 151
 152 void wxStreamBuffer::GetFromBuffer(void *buffer, size_t size)
 153 {
 154   size_t s_toget = m_buffer_end-m_buffer_pos;
 155
 156   if (size < s_toget)
 157     s_toget = size;
 158
 159   memcpy(buffer, m_buffer_pos, s_toget);
 160   m_buffer_pos += s_toget;
 161 }
 162
 163 void wxStreamBuffer::PutToBuffer(const void *buffer, size_t size)
 164 {
 165   size_t s_toput = m_buffer_end-m_buffer_pos;
 166
 167   if (s_toput < size && !m_fixed) {
 168     m_buffer_start = (char *)realloc(m_buffer_start, m_buffer_size+size);
 169     // I round a bit
 170     m_buffer_size += size;
 171     m_buffer_end = m_buffer_start+m_buffer_size;
 172     s_toput = size;
 173   }
 174   if (s_toput > size)
 175     s_toput = size;
 176   memcpy(m_buffer_pos, buffer, s_toput);
 177   m_buffer_pos += s_toput;
 178 }
 179
 180 void wxStreamBuffer::PutChar(char c)
 181 {
 182   wxASSERT(m_stream != NULL);
 183
 184   if (!m_buffer_size) {
 185     m_stream->OnSysWrite(&c, 1);
 186     return;
 187   }
 188
 189   if (GetDataLeft() == 0 && !FlushBuffer()) {
 190     CHECK_ERROR(wxStream_WRITE_ERR);
 191     return;
 192   }
 193
 194   PutToBuffer(&c, 1);
 195   m_stream->m_lastcount = 1;
 196 }
 197
 198 char wxStreamBuffer::Peek()
 199 {
 200   char c;
 201
 202   wxASSERT(m_stream != NULL && m_buffer_size != 0);
 203
 204   if (!GetDataLeft()) {
 205     CHECK_ERROR(wxStream_READ_ERR);
 206     return 0;
 207   }
 208
 209   GetFromBuffer(&c, 1);
 210   m_buffer_pos--;
 211
 212   return c;
 213 }
 214
 215 char wxStreamBuffer::GetChar()
 216 {
 217   char c;
 218
 219   wxASSERT(m_stream != NULL);
 220
 221   if (!m_buffer_size) {
 222     m_stream->OnSysRead(&c, 1);
 223     return c;
 224   }
 225
 226   if (!GetDataLeft()) {
 227     CHECK_ERROR(wxStream_READ_ERR);
 228     return 0;
 229   }
 230
 231   GetFromBuffer(&c, 1);
 232
 233   m_stream->m_lastcount = 1;
 234   return c;
 235 }
 236
 237 size_t wxStreamBuffer::Read(void *buffer, size_t size)
 238 {
 239   wxASSERT(m_stream != NULL);
 240
 241   if (m_mode == write)
 242     return 0;
 243
 244   // ------------------
 245   // Buffering disabled
 246   // ------------------
 247
 248   m_stream->m_lasterror = wxStream_NOERROR;
 249   if (!m_buffer_size)
 250     return (m_stream->m_lastcount += m_stream->OnSysRead(buffer, size));
 251
 252   // -----------------
 253   // Buffering enabled
 254   // -----------------
 255   size_t buf_left, orig_size = size;
 256
 257   while (size > 0) {
 258     buf_left = GetDataLeft();
 259
 260     // First case: the requested buffer is larger than the stream buffer,
 261     //             we split it.
 262     if (size > buf_left) {
 263       GetFromBuffer(buffer, buf_left);
 264       size  -= buf_left;
 265       buffer = (char *)buffer + buf_left; // ANSI C++ violation.
 266
 267       if (!FillBuffer()) {
 268         CHECK_ERROR(wxStream_EOF);
 269         return (m_stream->m_lastcount = orig_size-size);
 270       }
 271     } else {
 272
 273       // Second case: we just copy from the stream buffer.
 274       GetFromBuffer(buffer, size);
 275       break;
 276     }
 277   }
 278   return (m_stream->m_lastcount += orig_size);
 279 }
 280
 281 size_t wxStreamBuffer::Read(wxStreamBuffer *s_buf)
 282 {
 283   char buf[BUF_TEMP_SIZE];
 284   size_t s = 0, bytes_read = BUF_TEMP_SIZE;
 285
 286   if (m_mode == write)
 287     return 0;
 288
 289   while (bytes_read != 0) {
 290     bytes_read = Read(buf, bytes_read);
 291     bytes_read = s_buf->Write(buf, bytes_read);
 292     s += bytes_read;
 293   }
 294   return s;
 295 }
 296
 297 size_t wxStreamBuffer::Write(const void *buffer, size_t size)
 298 {
 299   wxASSERT(m_stream != NULL);
 300
 301   if (m_mode == read)
 302     return 0;
 303
 304   // ------------------
 305   // Buffering disabled
 306   // ------------------
 307
 308   m_stream->m_lasterror = wxStream_NOERROR;
 309   if (!m_buffer_size)
 310     return (m_stream->m_lastcount = m_stream->OnSysWrite(buffer, size));
 311
 312   // ------------------
 313   // Buffering enabled
 314   // ------------------
 315
 316   size_t buf_left, orig_size = size;
 317
 318   while (size > 0) {
 319     buf_left = m_buffer_end - m_buffer_pos;
 320
 321     // First case: the buffer to write is larger than the stream buffer,
 322     //             we split it
 323     if (size > buf_left) {
 324       PutToBuffer(buffer, buf_left);
 325       size -= buf_left;
 326       buffer = (char *)buffer + buf_left; // ANSI C++ violation.
 327
 328       if (!FlushBuffer()) {
 329         CHECK_ERROR(wxStream_WRITE_ERR);
 330         return (m_stream->m_lastcount = orig_size-size);
 331       }
 332
 333       m_buffer_pos = m_buffer_start;
 334
 335     } else {
 336
 337       // Second case: just copy it in the stream buffer.
 338       PutToBuffer(buffer, size);
 339       break;
 340     }
 341   }
 342   return (m_stream->m_lastcount = orig_size);
 343 }
 344
 345 size_t wxStreamBuffer::Write(wxStreamBuffer *sbuf)
 346 {
 347   char buf[BUF_TEMP_SIZE];
 348   size_t s = 0, bytes_count = BUF_TEMP_SIZE, b_count2;
 349   wxInputStream *in_stream;
 350
 351   if (m_mode == read)
 352     return 0;
 353
 354   in_stream = (wxInputStream *)sbuf->Stream();
 355
 356   while (bytes_count == BUF_TEMP_SIZE) {
 357     b_count2 = sbuf->Read(buf, bytes_count);
 358     bytes_count = Write(buf, b_count2);
 359     if (b_count2 > bytes_count)
 360       in_stream->Ungetch(buf+bytes_count, b_count2-bytes_count);
 361     s += bytes_count;
 362   }
 363   return s;
 364 }
 365
 366 off_t wxStreamBuffer::Seek(off_t pos, wxSeekMode mode)
 367 {
 368   off_t ret_off, diff, last_access;
 369
 370   last_access = GetLastAccess();
 371
 372   if (!m_flushable) {
 373     diff = pos + GetIntPosition();
 374     if (diff < 0 || diff > last_access)
 375       return wxInvalidOffset;
 376     SetIntPosition(diff);
 377     return diff;
 378   }
 379
 380   switch (mode) {
 381   case wxFromStart: {
 382     // We'll try to compute an internal position later ...
 383     ret_off = m_stream->OnSysSeek(pos, wxFromStart);
 384     ResetBuffer();
 385     return ret_off;
 386   }
 387   case wxFromCurrent: {
 388     diff = pos + GetIntPosition();
 389
 390     if ( (diff > last_access) || (diff < 0) ) {
 391       // We must take into account the fact that we have read something
 392       // previously.
 393       ret_off = m_stream->OnSysSeek(diff-last_access, wxFromCurrent);
 394       ResetBuffer();
 395       return ret_off;
 396     } else {
 397       SetIntPosition(diff);
 398       return pos;
 399     }
 400   }
 401   case wxFromEnd:
 402     // Hard to compute: always seek to the requested position.
 403     ret_off = m_stream->OnSysSeek(pos, wxFromEnd);
 404     ResetBuffer();
 405     return ret_off;
 406   }
 407   return wxInvalidOffset;
 408 }
 409
 410 off_t wxStreamBuffer::Tell() const
 411 {
 412   off_t pos;
 413
 414   if (m_flushable) {
 415     pos = m_stream->OnSysTell();
 416     if (pos == wxInvalidOffset)
 417       return wxInvalidOffset;
 418     return pos - GetLastAccess() + GetIntPosition();
 419   } else
 420     return GetIntPosition();
 421 }
 422
 423 size_t wxStreamBuffer::GetDataLeft()
 424 {
 425   if (m_buffer_end == m_buffer_pos && m_flushable)
 426     FillBuffer();
 427   return m_buffer_end-m_buffer_pos;
 428 }
 429
 430 // ----------------------------------------------------------------------------
 431 // wxStreamBase
 432 // ----------------------------------------------------------------------------
 433
 434 wxStreamBase::wxStreamBase()
 435 {
 436   m_lasterror = wxStream_NOERROR;
 437   m_lastcount = 0;
 438 }
 439
 440 wxStreamBase::~wxStreamBase()
 441 {
 442 }
 443
 444 size_t wxStreamBase::OnSysRead(void *WXUNUSED(buffer), size_t WXUNUSED(size))
 445 {
 446   return 0;
 447 }
 448
 449 size_t wxStreamBase::OnSysWrite(const void *WXUNUSED(buffer), size_t WXUNUSED(bufsize))
 450 {
 451   return 0;
 452 }
 453
 454 off_t wxStreamBase::OnSysSeek(off_t WXUNUSED(seek), wxSeekMode WXUNUSED(mode))
 455 {
 456   return wxInvalidOffset;
 457 }
 458
 459 off_t wxStreamBase::OnSysTell() const
 460 {
 461   return wxInvalidOffset;
 462 }
 463
 464 // ----------------------------------------------------------------------------
 465 // wxInputStream
 466 // ----------------------------------------------------------------------------
 467
 468 wxInputStream::wxInputStream()
 469   : wxStreamBase(),
 470     m_wback(NULL), m_wbacksize(0), m_wbackcur(0)
 471 {
 472 }
 473
 474 wxInputStream::~wxInputStream()
 475 {
 476   if (m_wback)
 477     free(m_wback);
 478 }
 479
 480 char *wxInputStream::AllocSpaceWBack(size_t needed_size)
 481 {
 482   char *temp_b;
 483
 484   m_wbacksize += needed_size;
 485
 486   if (!m_wback)
 487     temp_b = (char *)malloc(m_wbacksize);
 488   else
 489     temp_b = (char *)realloc(m_wback, m_wbacksize);
 490
 491   if (!temp_b)
 492     return NULL;
 493   m_wback = temp_b;
 494
 495   return (char *)(m_wback+(m_wbacksize-needed_size));
 496 }
 497
 498 size_t wxInputStream::GetWBack(char *buf, size_t bsize)
 499 {
 500   size_t s_toget = m_wbacksize-m_wbackcur;
 501
 502   if (!m_wback)
 503     return 0;
 504
 505   if (bsize < s_toget)
 506     s_toget = bsize;
 507
 508   memcpy(buf, (m_wback+m_wbackcur), s_toget);
 509
 510   m_wbackcur += s_toget;
 511   if (m_wbackcur == m_wbacksize) {
 512     free(m_wback);
 513     m_wback = (char *)NULL;
 514     m_wbacksize = 0;
 515     m_wbackcur = 0;
 516   }
 517
 518   return s_toget;
 519 }
 520
 521 size_t wxInputStream::Ungetch(const void *buf, size_t bufsize)
 522 {
 523   char *ptrback;
 524
 525   ptrback = AllocSpaceWBack(bufsize);
 526   if (!ptrback)
 527     return 0;
 528
 529   memcpy(ptrback, buf, bufsize);
 530   return bufsize;
 531 }
 532
 533 bool wxInputStream::Ungetch(char c)
 534 {
 535   char *ptrback;
 536
 537   ptrback = AllocSpaceWBack(1);
 538   if (!ptrback)
 539     return FALSE;
 540
 541   *ptrback = c;
 542   return TRUE;
 543 }
 544
 545 char wxInputStream::GetC()
 546 {
 547   char c;
 548   Read(&c, 1);
 549   return c;
 550 }
 551
 552 wxInputStream& wxInputStream::Read(void *buffer, size_t size)
 553 {
 554   size_t retsize;
 555   char *buf = (char *)buffer;
 556
 557   retsize = GetWBack(buf, size);
 558   if (retsize == size) {
 559     m_lastcount = size;
 560     m_lasterror = wxStream_NOERROR;
 561     return *this;
 562   }
 563   size     -= retsize;
 564   buf      += retsize;
 565
 566   m_lastcount = OnSysRead(buf, size);
 567   return *this;
 568 }
 569
 570 char wxInputStream::Peek()
 571 {
 572   char c;
 573
 574   Read(&c, 1);
 575   if (m_lasterror == wxStream_NOERROR) {
 576     Ungetch(c);
 577     return c;
 578   }
 579   return 0;
 580 }
 581
 582 wxInputStream& wxInputStream::Read(wxOutputStream& stream_out)
 583 {
 584   char buf[BUF_TEMP_SIZE];
 585   size_t bytes_read = BUF_TEMP_SIZE;
 586
 587   while (bytes_read == BUF_TEMP_SIZE) {
 588     bytes_read = Read(buf, bytes_read).LastRead();
 589     bytes_read = stream_out.Write(buf, bytes_read).LastWrite();
 590   }
 591   return *this;
 592 }
 593
 594 off_t wxInputStream::SeekI(off_t pos, wxSeekMode mode)
 595 {
 596   return OnSysSeek(pos, mode);
 597 }
 598
 599 off_t wxInputStream::TellI() const
 600 {
 601   return OnSysTell();
 602 }
 603
 604 // --------------------
 605 // Overloaded operators
 606 // --------------------
 607
 608 #if wxUSE_SERIAL
 609 wxInputStream& wxInputStream::operator>>(wxObject *& obj)
 610 {
 611   wxObjectInputStream obj_s(*this);
 612   obj = obj_s.LoadObject();
 613   return *this;
 614 }
 615 #endif
 616
 617
 618 // ----------------------------------------------------------------------------
 619 // wxOutputStream
 620 // ----------------------------------------------------------------------------
 621 wxOutputStream::wxOutputStream()
 622   : wxStreamBase()
 623 {
 624 }
 625
 626 wxOutputStream::~wxOutputStream()
 627 {
 628 }
 629
 630 wxOutputStream& wxOutputStream::Write(const void *buffer, size_t size)
 631 {
 632   m_lastcount = OnSysWrite(buffer, size);
 633   return *this;
 634 }
 635
 636 wxOutputStream& wxOutputStream::Write(wxInputStream& stream_in)
 637 {
 638   stream_in.Read(*this);
 639   return *this;
 640 }
 641
 642 off_t wxOutputStream::TellO() const
 643 {
 644   return OnSysTell();
 645 }
 646
 647 off_t wxOutputStream::SeekO(off_t pos, wxSeekMode mode)
 648 {
 649   return OnSysSeek(pos, mode);
 650 }
 651
 652 void wxOutputStream::Sync()
 653 {
 654 }
 655
 656 #if wxUSE_SERIAL
 657 wxOutputStream& wxOutputStream::operator<<(wxObject& obj)
 658 {
 659   wxObjectOutputStream obj_s(*this);
 660   obj_s.SaveObject(obj);
 661   return *this;
 662 }
 663 #endif
 664
 665 // ----------------------------------------------------------------------------
 666 // wxCountingOutputStream
 667 // ----------------------------------------------------------------------------
 668
 669 wxCountingOutputStream::wxCountingOutputStream ()
 670   : wxOutputStream()
 671 {
 672    m_currentPos = 0;
 673 }
 674
 675 size_t wxCountingOutputStream::GetSize() const
 676 {
 677   return m_lastcount;
 678 }
 679
 680 size_t wxCountingOutputStream::OnSysWrite(const void *buffer, size_t size)
 681 {
 682   m_currentPos += size;
 683   if (m_currentPos > m_lastcount) m_lastcount = m_currentPos;
 684   return m_currentPos;
 685 }
 686
 687 off_t wxCountingOutputStream::OnSysSeek(off_t pos, wxSeekMode mode)
 688 {
 689   if (mode == wxFromStart)
 690   {
 691     m_currentPos = pos;
 692   }
 693   if (mode == wxFromEnd)
 694   {
 695     m_currentPos = m_lastcount + pos;
 696   }
 697   else
 698   {
 699     m_currentPos += pos;
 700   }
 701   if (m_currentPos > m_lastcount) m_lastcount = m_currentPos;
 702
 703   return m_currentPos;  // ?
 704 }
 705
 706 off_t wxCountingOutputStream::OnSysTell() const
 707 {
 708   return m_currentPos;  // ?
 709 }
 710
 711 // ----------------------------------------------------------------------------
 712 // wxFilterInputStream
 713 // ----------------------------------------------------------------------------
 714
 715 wxFilterInputStream::wxFilterInputStream()
 716   : wxInputStream()
 717 {
 718 }
 719
 720 wxFilterInputStream::wxFilterInputStream(wxInputStream& stream)
 721   : wxInputStream()
 722 {
 723   m_parent_i_stream = &stream;
 724 }
 725
 726 wxFilterInputStream::~wxFilterInputStream()
 727 {
 728 }
 729
 730 // ----------------------------------------------------------------------------
 731 // wxFilterOutputStream
 732 // ----------------------------------------------------------------------------
 733 wxFilterOutputStream::wxFilterOutputStream()
 734   : wxOutputStream()
 735 {
 736 }
 737
 738 wxFilterOutputStream::wxFilterOutputStream(wxOutputStream& stream)
 739   : wxOutputStream()
 740 {
 741   m_parent_o_stream = &stream;
 742 }
 743
 744 wxFilterOutputStream::~wxFilterOutputStream()
 745 {
 746 }
 747
 748 // ----------------------------------------------------------------------------
 749 // wxBufferedInputStream
 750 // ----------------------------------------------------------------------------
 751 wxBufferedInputStream::wxBufferedInputStream(wxInputStream& s)
 752   : wxFilterInputStream(s)
 753 {
 754   m_i_streambuf = new wxStreamBuffer(*this, wxStreamBuffer::read);
 755   m_i_streambuf->SetBufferIO(1024);
 756 }
 757
 758 wxBufferedInputStream::~wxBufferedInputStream()
 759 {
 760   delete m_i_streambuf;
 761 }
 762
 763 char wxBufferedInputStream::Peek()
 764 {
 765   return m_i_streambuf->Peek();
 766 }
 767
 768 wxInputStream& wxBufferedInputStream::Read(void *buffer, size_t size)
 769 {
 770   size_t retsize;
 771   char *buf = (char *)buffer;
 772
 773   retsize = GetWBack(buf, size);
 774   m_lastcount = retsize;
 775   if (retsize == size) {
 776     m_lasterror = wxStream_NOERROR;
 777     return *this;
 778   }
 779   size     -= retsize;
 780   buf      += retsize;
 781
 782   m_i_streambuf->Read(buf, size);
 783
 784   return *this;
 785 }
 786
 787 off_t wxBufferedInputStream::SeekI(off_t pos, wxSeekMode mode)
 788 {
 789   return m_i_streambuf->Seek(pos, mode);
 790 }
 791
 792 off_t wxBufferedInputStream::TellI() const
 793 {
 794   return m_i_streambuf->Tell();
 795 }
 796
 797 size_t wxBufferedInputStream::OnSysRead(void *buffer, size_t bufsize)
 798 {
 799   return m_parent_i_stream->Read(buffer, bufsize).LastRead();
 800 }
 801
 802 off_t wxBufferedInputStream::OnSysSeek(off_t seek, wxSeekMode mode)
 803 {
 804   return m_parent_i_stream->SeekI(seek, mode);
 805 }
 806
 807 off_t wxBufferedInputStream::OnSysTell() const
 808 {
 809   return m_parent_i_stream->TellI();
 810 }
 811
 812 // ----------------------------------------------------------------------------
 813 // wxBufferedOutputStream
 814 // ----------------------------------------------------------------------------
 815
 816 wxBufferedOutputStream::wxBufferedOutputStream(wxOutputStream& s)
 817   : wxFilterOutputStream(s)
 818 {
 819   m_o_streambuf = new wxStreamBuffer(*this, wxStreamBuffer::write);
 820   m_o_streambuf->SetBufferIO(1024);
 821 }
 822
 823 wxBufferedOutputStream::~wxBufferedOutputStream()
 824 {
 825   delete m_o_streambuf;
 826 }
 827
 828 wxOutputStream& wxBufferedOutputStream::Write(const void *buffer, size_t size)
 829 {
 830   m_lastcount = 0;
 831   m_o_streambuf->Write(buffer, size);
 832   return *this;
 833 }
 834
 835 off_t wxBufferedOutputStream::SeekO(off_t pos, wxSeekMode mode)
 836 {
 837   return m_o_streambuf->Seek(pos, mode);
 838 }
 839
 840 off_t wxBufferedOutputStream::TellO() const
 841 {
 842   return m_o_streambuf->Tell();
 843 }
 844
 845 void wxBufferedOutputStream::Sync()
 846 {
 847   m_o_streambuf->FlushBuffer();
 848   m_parent_o_stream->Sync();
 849 }
 850
 851 size_t wxBufferedOutputStream::OnSysWrite(const void *buffer, size_t bufsize)
 852 {
 853   return m_parent_o_stream->Write(buffer, bufsize).LastWrite();
 854 }
 855
 856 off_t wxBufferedOutputStream::OnSysSeek(off_t seek, wxSeekMode mode)
 857 {
 858   return m_parent_o_stream->SeekO(seek, mode);
 859 }
 860
 861 off_t wxBufferedOutputStream::OnSysTell() const
 862 {
 863   return m_parent_o_stream->TellO();
 864 }
 865
 866 // ----------------------------------------------------------------------------
 867 // Some IOManip function
 868 // ----------------------------------------------------------------------------
 869
 870 wxOutputStream& wxEndL(wxOutputStream& stream)
 871 {
 872 #ifdef __MSW__
 873   return stream.Write("\r\n", 2);
 874 #else
 875 #ifdef __WXMAC__
 876   return stream.Write("\r", 1);
 877 #else
 878   return stream.Write("\n", 1);
 879 #endif
 880 #endif
 881 }
 882
 883 #endif
 884   // wxUSE_STREAMS