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 (!m_wback)
 484     return 0;
 485
 486   if (bsize < s_toget)
 487     s_toget = bsize;
 488
 489   memcpy(buf, (m_wback+m_wbackcur), s_toget);
 490
 491   m_wbackcur += s_toget;
 492   if (m_wbackcur == m_wbacksize) {
 493     free(m_wback);
 494     m_wback = (char *)NULL;
 495     m_wbacksize = 0;
 496     m_wbackcur = 0;
 497   }
 498
 499   return s_toget;
 500 }
 501
 502 size_t wxInputStream::Ungetch(void *buf, size_t bufsize)
 503 {
 504   char *ptrback;
 505
 506   ptrback = AllocSpaceWBack(bufsize);
 507   if (!ptrback)
 508     return 0;
 509
 510   memcpy(ptrback, buf, bufsize);
 511   return bufsize;
 512 }
 513
 514 bool wxInputStream::Ungetch(char c)
 515 {
 516   char *ptrback;
 517
 518   ptrback = AllocSpaceWBack(1);
 519   if (!ptrback)
 520     return FALSE;
 521
 522   *ptrback = c;
 523   return TRUE;
 524 }
 525
 526 char wxInputStream::GetC()
 527 {
 528   char c;
 529   Read(&c, 1);
 530   return c;
 531 }
 532
 533 wxInputStream& wxInputStream::Read(void *buffer, size_t size)
 534 {
 535   size_t retsize;
 536   char *buf = (char *)buffer;
 537
 538   retsize = GetWBack(buf, size);
 539   if (retsize == size) {
 540     m_lastcount = size;
 541     m_lasterror = wxStream_NOERROR;
 542     return *this;
 543   }
 544   size     -= retsize;
 545   buf      += retsize;
 546
 547   m_lastcount = OnSysRead(buf, size);
 548   return *this;
 549 }
 550
 551 char wxInputStream::Peek()
 552 {
 553   char c;
 554
 555   Read(&c, 1);
 556   if (m_lasterror == wxStream_NOERROR) {
 557     Ungetch(c);
 558     return c;
 559   }
 560   return 0;
 561 }
 562
 563 wxInputStream& wxInputStream::Read(wxOutputStream& stream_out)
 564 {
 565   char buf[BUF_TEMP_SIZE];
 566   size_t bytes_read = BUF_TEMP_SIZE;
 567
 568   while (bytes_read == BUF_TEMP_SIZE) {
 569     bytes_read = Read(buf, bytes_read).LastRead();
 570     bytes_read = stream_out.Write(buf, bytes_read).LastWrite();
 571   }
 572   return *this;
 573 }
 574
 575 off_t wxInputStream::SeekI(off_t pos, wxSeekMode mode)
 576 {
 577   return wxInvalidOffset;
 578 }
 579
 580 off_t wxInputStream::TellI() const
 581 {
 582   return wxInvalidOffset;
 583 }
 584
 585 // --------------------
 586 // Overloaded operators
 587 // --------------------
 588
 589 #if wxUSE_SERIAL
 590 wxInputStream& wxInputStream::operator>>(wxObject *& obj)
 591 {
 592   wxObjectInputStream obj_s(*this);
 593   obj = obj_s.LoadObject();
 594   return *this;
 595 }
 596 #endif
 597
 598
 599 // ----------------------------------------------------------------------------
 600 // wxOutputStream
 601 // ----------------------------------------------------------------------------
 602 wxOutputStream::wxOutputStream()
 603   : wxStreamBase()
 604 {
 605 }
 606
 607 wxOutputStream::~wxOutputStream()
 608 {
 609 }
 610
 611 wxOutputStream& wxOutputStream::Write(const void *buffer, size_t size)
 612 {
 613   m_lastcount = OnSysWrite(buffer, size);
 614   return *this;
 615 }
 616
 617 wxOutputStream& wxOutputStream::Write(wxInputStream& stream_in)
 618 {
 619   stream_in.Read(*this);
 620   return *this;
 621 }
 622
 623 off_t wxOutputStream::TellO() const
 624 {
 625   return wxInvalidOffset;
 626 }
 627
 628 off_t wxOutputStream::SeekO(off_t pos, wxSeekMode mode)
 629 {
 630   return wxInvalidOffset;
 631 }
 632
 633 void wxOutputStream::Sync()
 634 {
 635 }
 636
 637 #if wxUSE_SERIAL
 638 wxOutputStream& wxOutputStream::operator<<(wxObject& obj)
 639 {
 640   wxObjectOutputStream obj_s(*this);
 641   obj_s.SaveObject(obj);
 642   return *this;
 643 }
 644 #endif
 645
 646 // ----------------------------------------------------------------------------
 647 // wxFilterInputStream
 648 // ----------------------------------------------------------------------------
 649 wxFilterInputStream::wxFilterInputStream()
 650   : wxInputStream()
 651 {
 652 }
 653
 654 wxFilterInputStream::wxFilterInputStream(wxInputStream& stream)
 655   : wxInputStream()
 656 {
 657   m_parent_i_stream = &stream;
 658 }
 659
 660 wxFilterInputStream::~wxFilterInputStream()
 661 {
 662 }
 663
 664 // ----------------------------------------------------------------------------
 665 // wxFilterOutputStream
 666 // ----------------------------------------------------------------------------
 667 wxFilterOutputStream::wxFilterOutputStream()
 668   : wxOutputStream()
 669 {
 670 }
 671
 672 wxFilterOutputStream::wxFilterOutputStream(wxOutputStream& stream)
 673   : wxOutputStream()
 674 {
 675   m_parent_o_stream = &stream;
 676 }
 677
 678 wxFilterOutputStream::~wxFilterOutputStream()
 679 {
 680 }
 681
 682 // ----------------------------------------------------------------------------
 683 // wxBufferedInputStream
 684 // ----------------------------------------------------------------------------
 685 wxBufferedInputStream::wxBufferedInputStream(wxInputStream& s)
 686   : wxFilterInputStream(s)
 687 {
 688   m_i_streambuf = new wxStreamBuffer(*this, wxStreamBuffer::read);
 689   m_i_streambuf->SetBufferIO(1024);
 690 }
 691
 692 wxBufferedInputStream::~wxBufferedInputStream()
 693 {
 694   delete m_i_streambuf;
 695 }
 696
 697 wxInputStream& wxBufferedInputStream::Read(void *buffer, size_t size)
 698 {
 699   size_t retsize;
 700   char *buf = (char *)buffer;
 701
 702   retsize = GetWBack(buf, size);
 703   m_lastcount = retsize;
 704   if (retsize == size) {
 705     m_lasterror = wxStream_NOERROR;
 706     return *this;
 707   }
 708   size     -= retsize;
 709   buf      += retsize;
 710
 711   m_i_streambuf->Read(buf, size);
 712
 713   return *this;
 714 }
 715
 716 off_t wxBufferedInputStream::SeekI(off_t pos, wxSeekMode mode)
 717 {
 718   return m_i_streambuf->Seek(pos, mode);
 719 }
 720
 721 off_t wxBufferedInputStream::TellI() const
 722 {
 723   return m_i_streambuf->Tell();
 724 }
 725
 726 size_t wxBufferedInputStream::OnSysRead(void *buffer, size_t bufsize)
 727 {
 728   return m_parent_i_stream->Read(buffer, bufsize).LastRead();
 729 }
 730
 731 off_t wxBufferedInputStream::OnSysSeek(off_t seek, wxSeekMode mode)
 732 {
 733   return m_parent_i_stream->SeekI(seek, mode);
 734 }
 735
 736 off_t wxBufferedInputStream::OnSysTell() const
 737 {
 738   return m_parent_i_stream->TellI();
 739 }
 740
 741 // ----------------------------------------------------------------------------
 742 // wxBufferedOutputStream
 743 // ----------------------------------------------------------------------------
 744
 745 wxBufferedOutputStream::wxBufferedOutputStream(wxOutputStream& s)
 746   : wxFilterOutputStream(s)
 747 {
 748   m_o_streambuf = new wxStreamBuffer(*this, wxStreamBuffer::write);
 749   m_o_streambuf->SetBufferIO(1024);
 750 }
 751
 752 wxBufferedOutputStream::~wxBufferedOutputStream()
 753 {
 754   delete m_o_streambuf;
 755 }
 756
 757 wxOutputStream& wxBufferedOutputStream::Write(const void *buffer, size_t size)
 758 {
 759   m_lastcount = 0;
 760   m_o_streambuf->Write(buffer, size);
 761   return *this;
 762 }
 763
 764 off_t wxBufferedOutputStream::SeekO(off_t pos, wxSeekMode mode)
 765 {
 766   return m_o_streambuf->Seek(pos, mode);
 767 }
 768
 769 off_t wxBufferedOutputStream::TellO() const
 770 {
 771   return m_o_streambuf->Tell();
 772 }
 773
 774 void wxBufferedOutputStream::Sync()
 775 {
 776   m_o_streambuf->FlushBuffer();
 777   m_parent_o_stream->Sync();
 778 }
 779
 780 size_t wxBufferedOutputStream::OnSysWrite(const void *buffer, size_t bufsize)
 781 {
 782   return m_parent_o_stream->Write(buffer, bufsize).LastWrite();
 783 }
 784
 785 off_t wxBufferedOutputStream::OnSysSeek(off_t seek, wxSeekMode mode)
 786 {
 787   return m_parent_o_stream->SeekO(seek, mode);
 788 }
 789
 790 off_t wxBufferedOutputStream::OnSysTell() const
 791 {
 792   return m_parent_o_stream->TellO();
 793 }
 794
 795 // ----------------------------------------------------------------------------
 796 // Some IOManip function
 797 // ----------------------------------------------------------------------------
 798
 799 wxOutputStream& wxEndL(wxOutputStream& stream)
 800 {
 801 #ifdef __MSW__
 802   return stream.Write("\r\n", 2);
 803 #else
 804 #ifdef __WXMAC__
 805   return stream.Write("\r", 1);
 806 #else
 807   return stream.Write("\n", 1);
 808 #endif
 809 #endif
 810 }
 811
 812 #endif
 813   // wxUSE_STREAMS