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::GetChar()
 199 {
 200   char c;
 201
 202   wxASSERT(m_stream != NULL);
 203
 204   if (!m_buffer_size) {
 205     m_stream->OnSysRead(&c, 1);
 206     return c;
 207   }
 208
 209   if (!GetDataLeft()) {
 210     CHECK_ERROR(wxStream_READ_ERR);
 211     return 0;
 212   }
 213
 214   GetFromBuffer(&c, 1);
 215
 216   m_stream->m_lastcount = 1;
 217   return c;
 218 }
 219
 220 size_t wxStreamBuffer::Read(void *buffer, size_t size)
 221 {
 222   wxASSERT(m_stream != NULL);
 223
 224   if (m_mode == write)
 225     return 0;
 226
 227   // ------------------
 228   // Buffering disabled
 229   // ------------------
 230
 231   m_stream->m_lasterror = wxStream_NOERROR;
 232   if (!m_buffer_size)
 233     return (m_stream->m_lastcount += m_stream->OnSysRead(buffer, size));
 234
 235   // -----------------
 236   // Buffering enabled
 237   // -----------------
 238   size_t buf_left, orig_size = size;
 239
 240   while (size > 0) {
 241     buf_left = GetDataLeft();
 242
 243     // First case: the requested buffer is larger than the stream buffer,
 244     //             we split it.
 245     if (size > buf_left) {
 246       GetFromBuffer(buffer, buf_left);
 247       size  -= buf_left;
 248       buffer = (char *)buffer + buf_left; // ANSI C++ violation.
 249
 250       if (!FillBuffer()) {
 251         CHECK_ERROR(wxStream_READ_ERR);
 252         return (m_stream->m_lastcount = orig_size-size);
 253       }
 254     } else {
 255
 256       // Second case: we just copy from the stream buffer.
 257       GetFromBuffer(buffer, size);
 258       break;
 259     }
 260   }
 261   return (m_stream->m_lastcount += orig_size);
 262 }
 263
 264 size_t wxStreamBuffer::Read(wxStreamBuffer *s_buf)
 265 {
 266   char buf[BUF_TEMP_SIZE];
 267   size_t s = 0, bytes_read = BUF_TEMP_SIZE;
 268
 269   if (m_mode == write)
 270     return 0;
 271
 272   while (bytes_read != 0) {
 273     bytes_read = Read(buf, bytes_read);
 274     bytes_read = s_buf->Write(buf, bytes_read);
 275     s += bytes_read;
 276   }
 277   return s;
 278 }
 279
 280 size_t wxStreamBuffer::Write(const void *buffer, size_t size)
 281 {
 282   wxASSERT(m_stream != NULL);
 283
 284   if (m_mode == read)
 285     return 0;
 286
 287   // ------------------
 288   // Buffering disabled
 289   // ------------------
 290
 291   m_stream->m_lasterror = wxStream_NOERROR;
 292   if (!m_buffer_size)
 293     return (m_stream->m_lastcount = m_stream->OnSysWrite(buffer, size));
 294
 295   // ------------------
 296   // Buffering enabled
 297   // ------------------
 298
 299   size_t buf_left, orig_size = size;
 300
 301   while (size > 0) {
 302     buf_left = m_buffer_end - m_buffer_pos;
 303
 304     // First case: the buffer to write is larger than the stream buffer,
 305     //             we split it
 306     if (size > buf_left) {
 307       PutToBuffer(buffer, buf_left);
 308       size -= buf_left;
 309       buffer = (char *)buffer + buf_left; // ANSI C++ violation.
 310
 311       if (!FlushBuffer()) {
 312         CHECK_ERROR(wxStream_WRITE_ERR);
 313         return (m_stream->m_lastcount = orig_size-size);
 314       }
 315
 316       m_buffer_pos = m_buffer_start;
 317
 318     } else {
 319
 320       // Second case: just copy it in the stream buffer.
 321       PutToBuffer(buffer, size);
 322       break;
 323     }
 324   }
 325   return (m_stream->m_lastcount = orig_size);
 326 }
 327
 328 size_t wxStreamBuffer::Write(wxStreamBuffer *sbuf)
 329 {
 330   char buf[BUF_TEMP_SIZE];
 331   size_t s = 0, bytes_count = BUF_TEMP_SIZE, b_count2;
 332   wxInputStream *in_stream;
 333
 334   if (m_mode == read)
 335     return 0;
 336
 337   in_stream = (wxInputStream *)sbuf->Stream();
 338
 339   while (bytes_count == BUF_TEMP_SIZE) {
 340     b_count2 = sbuf->Read(buf, bytes_count);
 341     bytes_count = Write(buf, b_count2);
 342     if (b_count2 > bytes_count)
 343       in_stream->Ungetch(buf+bytes_count, b_count2-bytes_count);
 344     s += bytes_count;
 345   }
 346   return s;
 347 }
 348
 349 off_t wxStreamBuffer::Seek(off_t pos, wxSeekMode mode)
 350 {
 351   off_t ret_off, diff, last_access;
 352
 353   last_access = GetLastAccess();
 354
 355   if (!m_flushable) {
 356     diff = pos + GetIntPosition();
 357     if (diff < 0 || diff > last_access)
 358       return wxInvalidOffset;
 359     SetIntPosition(diff);
 360     return diff;
 361   }
 362
 363   switch (mode) {
 364   case wxFromStart: {
 365     // We'll try to compute an internal position later ...
 366     ret_off = m_stream->OnSysSeek(pos, wxFromStart);
 367     ResetBuffer();
 368     return ret_off;
 369   }
 370   case wxFromCurrent: {
 371     diff = pos + GetIntPosition();
 372
 373     if ( (diff > last_access) || (diff < 0) ) {
 374       ret_off = m_stream->OnSysSeek(pos, wxFromCurrent);
 375       ResetBuffer();
 376       return ret_off;
 377     } else {
 378       SetIntPosition(diff);
 379       return pos;
 380     }
 381   }
 382   case wxFromEnd:
 383     // Hard to compute: always seek to the requested position.
 384     ret_off = m_stream->OnSysSeek(pos, wxFromEnd);
 385     ResetBuffer();
 386     return ret_off;
 387   }
 388   return wxInvalidOffset;
 389 }
 390
 391 off_t wxStreamBuffer::Tell() const
 392 {
 393   off_t pos;
 394
 395   if (m_flushable) {
 396     pos = m_stream->OnSysTell();
 397     if (pos == wxInvalidOffset)
 398       return wxInvalidOffset;
 399     return pos - GetLastAccess() + GetIntPosition();
 400   } else
 401     return GetIntPosition();
 402 }
 403
 404 size_t wxStreamBuffer::GetDataLeft()
 405 {
 406   if (m_buffer_end == m_buffer_pos && m_flushable)
 407     FillBuffer();
 408   return m_buffer_end-m_buffer_pos;
 409 }
 410
 411 // ----------------------------------------------------------------------------
 412 // wxStreamBase
 413 // ----------------------------------------------------------------------------
 414
 415 wxStreamBase::wxStreamBase()
 416 {
 417   m_lasterror = wxStream_NOERROR;
 418   m_lastcount = 0;
 419 }
 420
 421 wxStreamBase::~wxStreamBase()
 422 {
 423 }
 424
 425 size_t wxStreamBase::OnSysRead(void *WXUNUSED(buffer), size_t WXUNUSED(size))
 426 {
 427   return 0;
 428 }
 429
 430 size_t wxStreamBase::OnSysWrite(const void *WXUNUSED(buffer), size_t WXUNUSED(bufsize))
 431 {
 432   return 0;
 433 }
 434
 435 off_t wxStreamBase::OnSysSeek(off_t WXUNUSED(seek), wxSeekMode WXUNUSED(mode))
 436 {
 437   return wxInvalidOffset;
 438 }
 439
 440 off_t wxStreamBase::OnSysTell() const
 441 {
 442   return wxInvalidOffset;
 443 }
 444
 445 // ----------------------------------------------------------------------------
 446 // wxInputStream
 447 // ----------------------------------------------------------------------------
 448
 449 wxInputStream::wxInputStream()
 450   : wxStreamBase(),
 451     m_wback(NULL), m_wbacksize(0), m_wbackcur(0)
 452 {
 453 }
 454
 455 wxInputStream::~wxInputStream()
 456 {
 457   if (m_wback)
 458     free(m_wback);
 459 }
 460
 461 char *wxInputStream::AllocSpaceWBack(size_t needed_size)
 462 {
 463   char *temp_b;
 464
 465   m_wbacksize += needed_size;
 466
 467   if (!m_wback)
 468     temp_b = (char *)malloc(m_wbacksize);
 469   else
 470     temp_b = (char *)realloc(m_wback, m_wbacksize);
 471
 472   if (!temp_b)
 473     return NULL;
 474   m_wback = temp_b;
 475
 476   return (char *)(m_wback+(m_wbacksize-needed_size));
 477 }
 478
 479 size_t wxInputStream::GetWBack(char *buf, size_t bsize)
 480 {
 481   size_t s_toget = m_wbacksize-m_wbackcur;
 482
 483   if (bsize < s_toget)
 484     s_toget = bsize;
 485
 486   memcpy(buf, (m_wback+m_wbackcur), s_toget);
 487
 488   m_wbackcur += s_toget;
 489   if (m_wbackcur == m_wbacksize) {
 490     free(m_wback);
 491     m_wback = (char *)NULL;
 492     m_wbacksize = 0;
 493     m_wbackcur = 0;
 494   }
 495
 496   return s_toget;
 497 }
 498
 499 size_t wxInputStream::Ungetch(void *buf, size_t bufsize)
 500 {
 501   char *ptrback;
 502
 503   ptrback = AllocSpaceWBack(bufsize);
 504   if (!ptrback)
 505     return 0;
 506
 507   memcpy(ptrback, buf, bufsize);
 508   return bufsize;
 509 }
 510
 511 bool wxInputStream::Ungetch(char c)
 512 {
 513   char *ptrback;
 514
 515   ptrback = AllocSpaceWBack(1);
 516   if (!ptrback)
 517     return FALSE;
 518
 519   *ptrback = c;
 520   return TRUE;
 521 }
 522
 523 char wxInputStream::GetC()
 524 {
 525   char c;
 526   Read(&c, 1);
 527   return c;
 528 }
 529
 530 wxInputStream& wxInputStream::Read(void *buffer, size_t size)
 531 {
 532   size_t retsize;
 533   char *buf = (char *)buffer;
 534
 535   retsize = GetWBack(buf, size);
 536   if (retsize == size) {
 537     m_lastcount = size;
 538     m_lasterror = wxStream_NOERROR;
 539     return *this;
 540   }
 541   size     -= retsize;
 542   buf      += retsize;
 543
 544   m_lastcount = OnSysRead(buf, size);
 545   return *this;
 546 }
 547
 548 char wxInputStream::Peek()
 549 {
 550   char c;
 551
 552   Read(&c, 1);
 553   if (m_lasterror == wxStream_NOERROR) {
 554     Ungetch(c);
 555     return c;
 556   }
 557   return 0;
 558 }
 559
 560 wxInputStream& wxInputStream::Read(wxOutputStream& stream_out)
 561 {
 562   char buf[BUF_TEMP_SIZE];
 563   size_t bytes_read = BUF_TEMP_SIZE;
 564
 565   while (bytes_read == BUF_TEMP_SIZE) {
 566     bytes_read = Read(buf, bytes_read).LastRead();
 567     bytes_read = stream_out.Write(buf, bytes_read).LastWrite();
 568   }
 569   return *this;
 570 }
 571
 572 off_t wxInputStream::SeekI(off_t pos, wxSeekMode mode)
 573 {
 574   return wxInvalidOffset;
 575 }
 576
 577 off_t wxInputStream::TellI() const
 578 {
 579   return wxInvalidOffset;
 580 }
 581
 582 // --------------------
 583 // Overloaded operators
 584 // --------------------
 585
 586 #if wxUSE_SERIAL
 587 wxInputStream& wxInputStream::operator>>(wxObject *& obj)
 588 {
 589   wxObjectInputStream obj_s(*this);
 590   obj = obj_s.LoadObject();
 591   return *this;
 592 }
 593 #endif
 594
 595
 596 // ----------------------------------------------------------------------------
 597 // wxOutputStream
 598 // ----------------------------------------------------------------------------
 599 wxOutputStream::wxOutputStream()
 600   : wxStreamBase()
 601 {
 602 }
 603
 604 wxOutputStream::~wxOutputStream()
 605 {
 606 }
 607
 608 wxOutputStream& wxOutputStream::Write(const void *buffer, size_t size)
 609 {
 610   m_lastcount = OnSysWrite(buffer, size);
 611   return *this;
 612 }
 613
 614 wxOutputStream& wxOutputStream::Write(wxInputStream& stream_in)
 615 {
 616   stream_in.Read(*this);
 617   return *this;
 618 }
 619
 620 off_t wxOutputStream::TellO() const
 621 {
 622   return wxInvalidOffset;
 623 }
 624
 625 off_t wxOutputStream::SeekO(off_t pos, wxSeekMode mode)
 626 {
 627   return wxInvalidOffset;
 628 }
 629
 630 void wxOutputStream::Sync()
 631 {
 632 }
 633
 634 #if wxUSE_SERIAL
 635 wxOutputStream& wxOutputStream::operator<<(wxObject& obj)
 636 {
 637   wxObjectOutputStream obj_s(*this);
 638   obj_s.SaveObject(obj);
 639   return *this;
 640 }
 641 #endif
 642
 643 // ----------------------------------------------------------------------------
 644 // wxFilterInputStream
 645 // ----------------------------------------------------------------------------
 646 wxFilterInputStream::wxFilterInputStream()
 647   : wxInputStream()
 648 {
 649 }
 650
 651 wxFilterInputStream::wxFilterInputStream(wxInputStream& stream)
 652   : wxInputStream()
 653 {
 654   m_parent_i_stream = &stream;
 655 }
 656
 657 wxFilterInputStream::~wxFilterInputStream()
 658 {
 659 }
 660
 661 // ----------------------------------------------------------------------------
 662 // wxFilterOutputStream
 663 // ----------------------------------------------------------------------------
 664 wxFilterOutputStream::wxFilterOutputStream()
 665   : wxOutputStream()
 666 {
 667 }
 668
 669 wxFilterOutputStream::wxFilterOutputStream(wxOutputStream& stream)
 670   : wxOutputStream()
 671 {
 672   m_parent_o_stream = &stream;
 673 }
 674
 675 wxFilterOutputStream::~wxFilterOutputStream()
 676 {
 677 }
 678
 679 // ----------------------------------------------------------------------------
 680 // wxBufferedInputStream
 681 // ----------------------------------------------------------------------------
 682 wxBufferedInputStream::wxBufferedInputStream(wxInputStream& s)
 683   : wxFilterInputStream(s)
 684 {
 685   m_i_streambuf = new wxStreamBuffer(*this, wxStreamBuffer::read);
 686   m_i_streambuf->SetBufferIO(1024);
 687 }
 688
 689 wxBufferedInputStream::~wxBufferedInputStream()
 690 {
 691   delete m_i_streambuf;
 692 }
 693
 694 wxInputStream& wxBufferedInputStream::Read(void *buffer, size_t size)
 695 {
 696   size_t retsize;
 697   char *buf = (char *)buffer;
 698
 699   retsize = GetWBack(buf, size);
 700   if (retsize == size) {
 701     m_lastcount = size;
 702     m_lasterror = wxStream_NOERROR;
 703     return *this;
 704   }
 705   size     -= retsize;
 706   buf      += retsize;
 707
 708   m_i_streambuf->Read(buf, size);
 709
 710   return *this;
 711 }
 712
 713 off_t wxBufferedInputStream::SeekI(off_t pos, wxSeekMode mode)
 714 {
 715   return m_i_streambuf->Seek(pos, mode);
 716 }
 717
 718 off_t wxBufferedInputStream::TellI() const
 719 {
 720   return m_i_streambuf->Tell();
 721 }
 722
 723 size_t wxBufferedInputStream::OnSysRead(void *buffer, size_t bufsize)
 724 {
 725   return m_parent_i_stream->Read(buffer, bufsize).LastRead();
 726 }
 727
 728 off_t wxBufferedInputStream::OnSysSeek(off_t seek, wxSeekMode mode)
 729 {
 730   return m_parent_i_stream->SeekI(seek, mode);
 731 }
 732
 733 off_t wxBufferedInputStream::OnSysTell() const
 734 {
 735   return m_parent_i_stream->TellI();
 736 }
 737
 738 // ----------------------------------------------------------------------------
 739 // wxBufferedOutputStream
 740 // ----------------------------------------------------------------------------
 741
 742 wxBufferedOutputStream::wxBufferedOutputStream(wxOutputStream& s)
 743   : wxFilterOutputStream(s)
 744 {
 745   m_o_streambuf = new wxStreamBuffer(*this, wxStreamBuffer::write);
 746   m_o_streambuf->SetBufferIO(1024);
 747 }
 748
 749 wxBufferedOutputStream::~wxBufferedOutputStream()
 750 {
 751   delete m_o_streambuf;
 752 }
 753
 754 wxOutputStream& wxBufferedOutputStream::Write(const void *buffer, size_t size)
 755 {
 756   m_o_streambuf->Write(buffer, size);
 757   return *this;
 758 }
 759
 760 off_t wxBufferedOutputStream::SeekO(off_t pos, wxSeekMode mode)
 761 {
 762   return m_o_streambuf->Seek(pos, mode);
 763 }
 764
 765 off_t wxBufferedOutputStream::TellO() const
 766 {
 767   return m_o_streambuf->Tell();
 768 }
 769
 770 void wxBufferedOutputStream::Sync()
 771 {
 772   m_o_streambuf->FlushBuffer();
 773   m_parent_o_stream->Sync();
 774 }
 775
 776 size_t wxBufferedOutputStream::OnSysWrite(const void *buffer, size_t bufsize)
 777 {
 778   return m_parent_o_stream->Write(buffer, bufsize).LastWrite();
 779 }
 780
 781 off_t wxBufferedOutputStream::OnSysSeek(off_t seek, wxSeekMode mode)
 782 {
 783   return m_parent_o_stream->SeekO(seek, mode);
 784 }
 785
 786 off_t wxBufferedOutputStream::OnSysTell() const
 787 {
 788   return m_parent_o_stream->TellO();
 789 }
 790
 791 // ----------------------------------------------------------------------------
 792 // Some IOManip function
 793 // ----------------------------------------------------------------------------
 794
 795 wxOutputStream& wxEndL(wxOutputStream& stream)
 796 {
 797 #ifdef __MSW__
 798   return stream.Write("\r\n", 2);
 799 #else
 800 #ifdef __WXMAC__
 801   return stream.Write("\r", 1);
 802 #else
 803   return stream.Write("\n", 1);
 804 #endif
 805 #endif
 806 }
 807
 808 #endif
 809   // wxUSE_STREAMS