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       // We must take into account the fact that we have read something
 375       // previously.
 376       ret_off = m_stream->OnSysSeek(diff-last_access, wxFromCurrent);
 377       ResetBuffer();
 378       return ret_off;
 379     } else {
 380       SetIntPosition(diff);
 381       return pos;
 382     }
 383   }
 384   case wxFromEnd:
 385     // Hard to compute: always seek to the requested position.
 386     ret_off = m_stream->OnSysSeek(pos, wxFromEnd);
 387     ResetBuffer();
 388     return ret_off;
 389   }
 390   return wxInvalidOffset;
 391 }
 392
 393 off_t wxStreamBuffer::Tell() const
 394 {
 395   off_t pos;
 396
 397   if (m_flushable) {
 398     pos = m_stream->OnSysTell();
 399     if (pos == wxInvalidOffset)
 400       return wxInvalidOffset;
 401     return pos - GetLastAccess() + GetIntPosition();
 402   } else
 403     return GetIntPosition();
 404 }
 405
 406 size_t wxStreamBuffer::GetDataLeft()
 407 {
 408   if (m_buffer_end == m_buffer_pos && m_flushable)
 409     FillBuffer();
 410   return m_buffer_end-m_buffer_pos;
 411 }
 412
 413 // ----------------------------------------------------------------------------
 414 // wxStreamBase
 415 // ----------------------------------------------------------------------------
 416
 417 wxStreamBase::wxStreamBase()
 418 {
 419   m_lasterror = wxStream_NOERROR;
 420   m_lastcount = 0;
 421 }
 422
 423 wxStreamBase::~wxStreamBase()
 424 {
 425 }
 426
 427 size_t wxStreamBase::OnSysRead(void *WXUNUSED(buffer), size_t WXUNUSED(size))
 428 {
 429   return 0;
 430 }
 431
 432 size_t wxStreamBase::OnSysWrite(const void *WXUNUSED(buffer), size_t WXUNUSED(bufsize))
 433 {
 434   return 0;
 435 }
 436
 437 off_t wxStreamBase::OnSysSeek(off_t WXUNUSED(seek), wxSeekMode WXUNUSED(mode))
 438 {
 439   return wxInvalidOffset;
 440 }
 441
 442 off_t wxStreamBase::OnSysTell() const
 443 {
 444   return wxInvalidOffset;
 445 }
 446
 447 // ----------------------------------------------------------------------------
 448 // wxInputStream
 449 // ----------------------------------------------------------------------------
 450
 451 wxInputStream::wxInputStream()
 452   : wxStreamBase(),
 453     m_wback(NULL), m_wbacksize(0), m_wbackcur(0)
 454 {
 455 }
 456
 457 wxInputStream::~wxInputStream()
 458 {
 459   if (m_wback)
 460     free(m_wback);
 461 }
 462
 463 char *wxInputStream::AllocSpaceWBack(size_t needed_size)
 464 {
 465   char *temp_b;
 466
 467   m_wbacksize += needed_size;
 468
 469   if (!m_wback)
 470     temp_b = (char *)malloc(m_wbacksize);
 471   else
 472     temp_b = (char *)realloc(m_wback, m_wbacksize);
 473
 474   if (!temp_b)
 475     return NULL;
 476   m_wback = temp_b;
 477
 478   return (char *)(m_wback+(m_wbacksize-needed_size));
 479 }
 480
 481 size_t wxInputStream::GetWBack(char *buf, size_t bsize)
 482 {
 483   size_t s_toget = m_wbacksize-m_wbackcur;
 484
 485   if (!m_wback)
 486     return 0;
 487
 488   if (bsize < s_toget)
 489     s_toget = bsize;
 490
 491   memcpy(buf, (m_wback+m_wbackcur), s_toget);
 492
 493   m_wbackcur += s_toget;
 494   if (m_wbackcur == m_wbacksize) {
 495     free(m_wback);
 496     m_wback = (char *)NULL;
 497     m_wbacksize = 0;
 498     m_wbackcur = 0;
 499   }
 500
 501   return s_toget;
 502 }
 503
 504 size_t wxInputStream::Ungetch(const void *buf, size_t bufsize)
 505 {
 506   char *ptrback;
 507
 508   ptrback = AllocSpaceWBack(bufsize);
 509   if (!ptrback)
 510     return 0;
 511
 512   memcpy(ptrback, buf, bufsize);
 513   return bufsize;
 514 }
 515
 516 bool wxInputStream::Ungetch(char c)
 517 {
 518   char *ptrback;
 519
 520   ptrback = AllocSpaceWBack(1);
 521   if (!ptrback)
 522     return FALSE;
 523
 524   *ptrback = c;
 525   return TRUE;
 526 }
 527
 528 char wxInputStream::GetC()
 529 {
 530   char c;
 531   Read(&c, 1);
 532   return c;
 533 }
 534
 535 wxInputStream& wxInputStream::Read(void *buffer, size_t size)
 536 {
 537   size_t retsize;
 538   char *buf = (char *)buffer;
 539
 540   retsize = GetWBack(buf, size);
 541   if (retsize == size) {
 542     m_lastcount = size;
 543     m_lasterror = wxStream_NOERROR;
 544     return *this;
 545   }
 546   size     -= retsize;
 547   buf      += retsize;
 548
 549   m_lastcount = OnSysRead(buf, size);
 550   return *this;
 551 }
 552
 553 char wxInputStream::Peek()
 554 {
 555   char c;
 556
 557   Read(&c, 1);
 558   if (m_lasterror == wxStream_NOERROR) {
 559     Ungetch(c);
 560     return c;
 561   }
 562   return 0;
 563 }
 564
 565 wxInputStream& wxInputStream::Read(wxOutputStream& stream_out)
 566 {
 567   char buf[BUF_TEMP_SIZE];
 568   size_t bytes_read = BUF_TEMP_SIZE;
 569
 570   while (bytes_read == BUF_TEMP_SIZE) {
 571     bytes_read = Read(buf, bytes_read).LastRead();
 572     bytes_read = stream_out.Write(buf, bytes_read).LastWrite();
 573   }
 574   return *this;
 575 }
 576
 577 off_t wxInputStream::SeekI(off_t pos, wxSeekMode mode)
 578 {
 579   return OnSysSeek(pos, mode);
 580 }
 581
 582 off_t wxInputStream::TellI() const
 583 {
 584   return OnSysTell();
 585 }
 586
 587 // --------------------
 588 // Overloaded operators
 589 // --------------------
 590
 591 #if wxUSE_SERIAL
 592 wxInputStream& wxInputStream::operator>>(wxObject *& obj)
 593 {
 594   wxObjectInputStream obj_s(*this);
 595   obj = obj_s.LoadObject();
 596   return *this;
 597 }
 598 #endif
 599
 600
 601 // ----------------------------------------------------------------------------
 602 // wxOutputStream
 603 // ----------------------------------------------------------------------------
 604 wxOutputStream::wxOutputStream()
 605   : wxStreamBase()
 606 {
 607 }
 608
 609 wxOutputStream::~wxOutputStream()
 610 {
 611 }
 612
 613 wxOutputStream& wxOutputStream::Write(const void *buffer, size_t size)
 614 {
 615   m_lastcount = OnSysWrite(buffer, size);
 616   return *this;
 617 }
 618
 619 wxOutputStream& wxOutputStream::Write(wxInputStream& stream_in)
 620 {
 621   stream_in.Read(*this);
 622   return *this;
 623 }
 624
 625 off_t wxOutputStream::TellO() const
 626 {
 627   return OnSysTell();
 628 }
 629
 630 off_t wxOutputStream::SeekO(off_t pos, wxSeekMode mode)
 631 {
 632   return OnSysSeek(pos, mode);
 633 }
 634
 635 void wxOutputStream::Sync()
 636 {
 637 }
 638
 639 #if wxUSE_SERIAL
 640 wxOutputStream& wxOutputStream::operator<<(wxObject& obj)
 641 {
 642   wxObjectOutputStream obj_s(*this);
 643   obj_s.SaveObject(obj);
 644   return *this;
 645 }
 646 #endif
 647
 648 // ----------------------------------------------------------------------------
 649 // wxCountingOutputStream
 650 // ----------------------------------------------------------------------------
 651
 652 wxCountingOutputStream::wxCountingOutputStream ()
 653   : wxOutputStream()
 654 {
 655    m_currentPos = 0;
 656 }
 657
 658 size_t wxCountingOutputStream::GetSize() const
 659 {
 660   return m_lastcount;
 661 }
 662
 663 size_t wxCountingOutputStream::OnSysWrite(const void *buffer, size_t size)
 664 {
 665   m_currentPos += size;
 666   if (m_currentPos > m_lastcount) m_lastcount = m_currentPos;
 667   return m_currentPos;
 668 }
 669
 670 off_t wxCountingOutputStream::OnSysSeek(off_t pos, wxSeekMode mode)
 671 {
 672   if (mode == wxFromStart)
 673   {
 674     m_currentPos = pos;
 675   }
 676   if (mode == wxFromEnd)
 677   {
 678     m_currentPos = m_lastcount + pos;
 679   }
 680   else
 681   {
 682     m_currentPos += pos;
 683   }
 684   if (m_currentPos > m_lastcount) m_lastcount = m_currentPos;
 685
 686   return m_currentPos;  // ?
 687 }
 688
 689 off_t wxCountingOutputStream::OnSysTell() const
 690 {
 691   return m_currentPos;  // ?
 692 }
 693
 694 // ----------------------------------------------------------------------------
 695 // wxFilterInputStream
 696 // ----------------------------------------------------------------------------
 697
 698 wxFilterInputStream::wxFilterInputStream()
 699   : wxInputStream()
 700 {
 701 }
 702
 703 wxFilterInputStream::wxFilterInputStream(wxInputStream& stream)
 704   : wxInputStream()
 705 {
 706   m_parent_i_stream = &stream;
 707 }
 708
 709 wxFilterInputStream::~wxFilterInputStream()
 710 {
 711 }
 712
 713 // ----------------------------------------------------------------------------
 714 // wxFilterOutputStream
 715 // ----------------------------------------------------------------------------
 716 wxFilterOutputStream::wxFilterOutputStream()
 717   : wxOutputStream()
 718 {
 719 }
 720
 721 wxFilterOutputStream::wxFilterOutputStream(wxOutputStream& stream)
 722   : wxOutputStream()
 723 {
 724   m_parent_o_stream = &stream;
 725 }
 726
 727 wxFilterOutputStream::~wxFilterOutputStream()
 728 {
 729 }
 730
 731 // ----------------------------------------------------------------------------
 732 // wxBufferedInputStream
 733 // ----------------------------------------------------------------------------
 734 wxBufferedInputStream::wxBufferedInputStream(wxInputStream& s)
 735   : wxFilterInputStream(s)
 736 {
 737   m_i_streambuf = new wxStreamBuffer(*this, wxStreamBuffer::read);
 738   m_i_streambuf->SetBufferIO(1024);
 739 }
 740
 741 wxBufferedInputStream::~wxBufferedInputStream()
 742 {
 743   delete m_i_streambuf;
 744 }
 745
 746 wxInputStream& wxBufferedInputStream::Read(void *buffer, size_t size)
 747 {
 748   size_t retsize;
 749   char *buf = (char *)buffer;
 750
 751   retsize = GetWBack(buf, size);
 752   m_lastcount = retsize;
 753   if (retsize == size) {
 754     m_lasterror = wxStream_NOERROR;
 755     return *this;
 756   }
 757   size     -= retsize;
 758   buf      += retsize;
 759
 760   m_i_streambuf->Read(buf, size);
 761
 762   return *this;
 763 }
 764
 765 off_t wxBufferedInputStream::SeekI(off_t pos, wxSeekMode mode)
 766 {
 767   return m_i_streambuf->Seek(pos, mode);
 768 }
 769
 770 off_t wxBufferedInputStream::TellI() const
 771 {
 772   return m_i_streambuf->Tell();
 773 }
 774
 775 size_t wxBufferedInputStream::OnSysRead(void *buffer, size_t bufsize)
 776 {
 777   return m_parent_i_stream->Read(buffer, bufsize).LastRead();
 778 }
 779
 780 off_t wxBufferedInputStream::OnSysSeek(off_t seek, wxSeekMode mode)
 781 {
 782   return m_parent_i_stream->SeekI(seek, mode);
 783 }
 784
 785 off_t wxBufferedInputStream::OnSysTell() const
 786 {
 787   return m_parent_i_stream->TellI();
 788 }
 789
 790 // ----------------------------------------------------------------------------
 791 // wxBufferedOutputStream
 792 // ----------------------------------------------------------------------------
 793
 794 wxBufferedOutputStream::wxBufferedOutputStream(wxOutputStream& s)
 795   : wxFilterOutputStream(s)
 796 {
 797   m_o_streambuf = new wxStreamBuffer(*this, wxStreamBuffer::write);
 798   m_o_streambuf->SetBufferIO(1024);
 799 }
 800
 801 wxBufferedOutputStream::~wxBufferedOutputStream()
 802 {
 803   delete m_o_streambuf;
 804 }
 805
 806 wxOutputStream& wxBufferedOutputStream::Write(const void *buffer, size_t size)
 807 {
 808   m_lastcount = 0;
 809   m_o_streambuf->Write(buffer, size);
 810   return *this;
 811 }
 812
 813 off_t wxBufferedOutputStream::SeekO(off_t pos, wxSeekMode mode)
 814 {
 815   return m_o_streambuf->Seek(pos, mode);
 816 }
 817
 818 off_t wxBufferedOutputStream::TellO() const
 819 {
 820   return m_o_streambuf->Tell();
 821 }
 822
 823 void wxBufferedOutputStream::Sync()
 824 {
 825   m_o_streambuf->FlushBuffer();
 826   m_parent_o_stream->Sync();
 827 }
 828
 829 size_t wxBufferedOutputStream::OnSysWrite(const void *buffer, size_t bufsize)
 830 {
 831   return m_parent_o_stream->Write(buffer, bufsize).LastWrite();
 832 }
 833
 834 off_t wxBufferedOutputStream::OnSysSeek(off_t seek, wxSeekMode mode)
 835 {
 836   return m_parent_o_stream->SeekO(seek, mode);
 837 }
 838
 839 off_t wxBufferedOutputStream::OnSysTell() const
 840 {
 841   return m_parent_o_stream->TellO();
 842 }
 843
 844 // ----------------------------------------------------------------------------
 845 // Some IOManip function
 846 // ----------------------------------------------------------------------------
 847
 848 wxOutputStream& wxEndL(wxOutputStream& stream)
 849 {
 850 #ifdef __MSW__
 851   return stream.Write("\r\n", 2);
 852 #else
 853 #ifdef __WXMAC__
 854   return stream.Write("\r", 1);
 855 #else
 856   return stream.Write("\n", 1);
 857 #endif
 858 #endif
 859 }
 860
 861 #endif
 862   // wxUSE_STREAMS