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 && m_flushable)
 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     if (!m_buffer_start)
 169       SetBufferIO(size);
 170     else {
 171       size_t delta = m_buffer_pos-m_buffer_start;
 172
 173       m_buffer_start = (char *)realloc(m_buffer_start, m_buffer_size+size);
 174       m_buffer_pos   = m_buffer_start + delta;
 175       // I round a bit
 176       m_buffer_size += size;
 177       m_buffer_end   = m_buffer_start+m_buffer_size;
 178     }
 179     s_toput = size;
 180   }
 181   if (s_toput > size)
 182     s_toput = size;
 183   memcpy(m_buffer_pos, buffer, s_toput);
 184   m_buffer_pos += s_toput;
 185 }
 186
 187 void wxStreamBuffer::PutChar(char c)
 188 {
 189   wxASSERT(m_stream != NULL);
 190
 191   if (!m_buffer_size) {
 192     m_stream->OnSysWrite(&c, 1);
 193     return;
 194   }
 195
 196   if (GetDataLeft() == 0 && !FlushBuffer()) {
 197     CHECK_ERROR(wxStream_WRITE_ERR);
 198     return;
 199   }
 200
 201   PutToBuffer(&c, 1);
 202   m_stream->m_lastcount = 1;
 203 }
 204
 205 char wxStreamBuffer::Peek()
 206 {
 207   char c;
 208
 209   wxASSERT(m_stream != NULL && m_buffer_size != 0);
 210
 211   if (!GetDataLeft()) {
 212     CHECK_ERROR(wxStream_READ_ERR);
 213     return 0;
 214   }
 215
 216   GetFromBuffer(&c, 1);
 217   m_buffer_pos--;
 218
 219   return c;
 220 }
 221
 222 char wxStreamBuffer::GetChar()
 223 {
 224   char c;
 225
 226   wxASSERT(m_stream != NULL);
 227
 228   if (!m_buffer_size) {
 229     m_stream->OnSysRead(&c, 1);
 230     return c;
 231   }
 232
 233   if (!GetDataLeft()) {
 234     CHECK_ERROR(wxStream_READ_ERR);
 235     return 0;
 236   }
 237
 238   GetFromBuffer(&c, 1);
 239
 240   m_stream->m_lastcount = 1;
 241   return c;
 242 }
 243
 244 size_t wxStreamBuffer::Read(void *buffer, size_t size)
 245 {
 246   wxASSERT(m_stream != NULL);
 247
 248   if (m_mode == write)
 249     return 0;
 250
 251   // ------------------
 252   // Buffering disabled
 253   // ------------------
 254
 255   m_stream->m_lasterror = wxStream_NOERROR;
 256   if (!m_buffer_size)
 257     return (m_stream->m_lastcount += m_stream->OnSysRead(buffer, size));
 258
 259   // -----------------
 260   // Buffering enabled
 261   // -----------------
 262   size_t buf_left, orig_size = size;
 263
 264   while (size > 0) {
 265     buf_left = GetDataLeft();
 266
 267     // First case: the requested buffer is larger than the stream buffer,
 268     //             we split it.
 269     if (size > buf_left) {
 270       GetFromBuffer(buffer, buf_left);
 271       size  -= buf_left;
 272       buffer = (char *)buffer + buf_left; // ANSI C++ violation.
 273
 274       if (!FillBuffer()) {
 275         CHECK_ERROR(wxStream_EOF);
 276         return (m_stream->m_lastcount = orig_size-size);
 277       }
 278     } else {
 279
 280       // Second case: we just copy from the stream buffer.
 281       GetFromBuffer(buffer, size);
 282       break;
 283     }
 284   }
 285   return (m_stream->m_lastcount += orig_size);
 286 }
 287
 288 size_t wxStreamBuffer::Read(wxStreamBuffer *s_buf)
 289 {
 290   char buf[BUF_TEMP_SIZE];
 291   size_t s = 0, bytes_read = BUF_TEMP_SIZE;
 292
 293   if (m_mode == write)
 294     return 0;
 295
 296   while (bytes_read != 0) {
 297     bytes_read = Read(buf, bytes_read);
 298     bytes_read = s_buf->Write(buf, bytes_read);
 299     s += bytes_read;
 300   }
 301   return s;
 302 }
 303
 304 size_t wxStreamBuffer::Write(const void *buffer, size_t size)
 305 {
 306   wxASSERT(m_stream != NULL);
 307
 308   if (m_mode == read)
 309     return 0;
 310
 311   // ------------------
 312   // Buffering disabled
 313   // ------------------
 314
 315   m_stream->m_lasterror = wxStream_NOERROR;
 316   if (!m_buffer_size && m_fixed)
 317     return (m_stream->m_lastcount = m_stream->OnSysWrite(buffer, size));
 318
 319   // ------------------
 320   // Buffering enabled
 321   // ------------------
 322
 323   size_t buf_left, orig_size = size;
 324
 325   while (size > 0) {
 326     buf_left = m_buffer_end - m_buffer_pos;
 327
 328     // First case: the buffer to write is larger than the stream buffer,
 329     //             we split it
 330     // NB: If stream buffer isn't fixed (as for wxMemoryOutputStream),
 331     // we always go to the second case.
 332     if (size > buf_left && m_fixed) {
 333       PutToBuffer(buffer, buf_left);
 334       size -= buf_left;
 335       buffer = (char *)buffer + buf_left; // ANSI C++ violation.
 336
 337       if (!FlushBuffer()) {
 338         CHECK_ERROR(wxStream_WRITE_ERR);
 339         return (m_stream->m_lastcount = orig_size-size);
 340       }
 341
 342       m_buffer_pos = m_buffer_start;
 343
 344     } else {
 345
 346       // Second case: just copy it in the stream buffer.
 347       PutToBuffer(buffer, size);
 348       break;
 349     }
 350   }
 351   return (m_stream->m_lastcount = orig_size);
 352 }
 353
 354 size_t wxStreamBuffer::Write(wxStreamBuffer *sbuf)
 355 {
 356   char buf[BUF_TEMP_SIZE];
 357   size_t s = 0, bytes_count = BUF_TEMP_SIZE, b_count2;
 358   wxInputStream *in_stream;
 359
 360   if (m_mode == read)
 361     return 0;
 362
 363   in_stream = (wxInputStream *)sbuf->Stream();
 364
 365   while (bytes_count == BUF_TEMP_SIZE) {
 366     b_count2 = sbuf->Read(buf, bytes_count);
 367     bytes_count = Write(buf, b_count2);
 368     if (b_count2 > bytes_count)
 369       in_stream->Ungetch(buf+bytes_count, b_count2-bytes_count);
 370     s += bytes_count;
 371   }
 372   return s;
 373 }
 374
 375 off_t wxStreamBuffer::Seek(off_t pos, wxSeekMode mode)
 376 {
 377   off_t ret_off, diff, last_access;
 378
 379   last_access = GetLastAccess();
 380
 381   if (!m_flushable) {
 382     diff = pos + GetIntPosition();
 383     if (diff < 0 || diff > last_access)
 384       return wxInvalidOffset;
 385     SetIntPosition(diff);
 386     return diff;
 387   }
 388
 389   switch (mode) {
 390   case wxFromStart: {
 391     // We'll try to compute an internal position later ...
 392     ret_off = m_stream->OnSysSeek(pos, wxFromStart);
 393     ResetBuffer();
 394     return ret_off;
 395   }
 396   case wxFromCurrent: {
 397     diff = pos + GetIntPosition();
 398
 399     if ( (diff > last_access) || (diff < 0) ) {
 400       // We must take into account the fact that we have read something
 401       // previously.
 402       ret_off = m_stream->OnSysSeek(diff-last_access, wxFromCurrent);
 403       ResetBuffer();
 404       return ret_off;
 405     } else {
 406       SetIntPosition(diff);
 407       return pos;
 408     }
 409   }
 410   case wxFromEnd:
 411     // Hard to compute: always seek to the requested position.
 412     ret_off = m_stream->OnSysSeek(pos, wxFromEnd);
 413     ResetBuffer();
 414     return ret_off;
 415   }
 416   return wxInvalidOffset;
 417 }
 418
 419 off_t wxStreamBuffer::Tell() const
 420 {
 421   off_t pos;
 422
 423   if (m_flushable) {
 424     pos = m_stream->OnSysTell();
 425     if (pos == wxInvalidOffset)
 426       return wxInvalidOffset;
 427     return pos - GetLastAccess() + GetIntPosition();
 428   } else
 429     return GetIntPosition();
 430 }
 431
 432 size_t wxStreamBuffer::GetDataLeft()
 433 {
 434   if (m_buffer_end == m_buffer_pos && m_flushable)
 435     FillBuffer();
 436   return m_buffer_end-m_buffer_pos;
 437 }
 438
 439 // ----------------------------------------------------------------------------
 440 // wxStreamBase
 441 // ----------------------------------------------------------------------------
 442
 443 wxStreamBase::wxStreamBase()
 444 {
 445   m_lasterror = wxStream_NOERROR;
 446   m_lastcount = 0;
 447 }
 448
 449 wxStreamBase::~wxStreamBase()
 450 {
 451 }
 452
 453 size_t wxStreamBase::OnSysRead(void *WXUNUSED(buffer), size_t WXUNUSED(size))
 454 {
 455   return 0;
 456 }
 457
 458 size_t wxStreamBase::OnSysWrite(const void *WXUNUSED(buffer), size_t WXUNUSED(bufsize))
 459 {
 460   return 0;
 461 }
 462
 463 off_t wxStreamBase::OnSysSeek(off_t WXUNUSED(seek), wxSeekMode WXUNUSED(mode))
 464 {
 465   return wxInvalidOffset;
 466 }
 467
 468 off_t wxStreamBase::OnSysTell() const
 469 {
 470   return wxInvalidOffset;
 471 }
 472
 473 // ----------------------------------------------------------------------------
 474 // wxInputStream
 475 // ----------------------------------------------------------------------------
 476
 477 wxInputStream::wxInputStream()
 478   : wxStreamBase(),
 479     m_wback(NULL), m_wbacksize(0), m_wbackcur(0)
 480 {
 481 }
 482
 483 wxInputStream::~wxInputStream()
 484 {
 485   if (m_wback)
 486     free(m_wback);
 487 }
 488
 489 char *wxInputStream::AllocSpaceWBack(size_t needed_size)
 490 {
 491   char *temp_b;
 492   size_t old_size;
 493
 494   old_size = m_wbacksize;
 495   m_wbacksize += needed_size;
 496
 497   if (!m_wback)
 498     temp_b = (char *)malloc(m_wbacksize);
 499   else
 500     temp_b = (char *)realloc(m_wback, m_wbacksize);
 501
 502   if (!temp_b)
 503     return NULL;
 504   m_wback = temp_b;
 505
 506   memmove(m_wback+needed_size, m_wback, old_size);
 507
 508   return (char *)(m_wback);
 509 }
 510
 511 size_t wxInputStream::GetWBack(char *buf, size_t bsize)
 512 {
 513   size_t s_toget = m_wbacksize-m_wbackcur;
 514
 515   if (!m_wback)
 516     return 0;
 517
 518   if (bsize < s_toget)
 519     s_toget = bsize;
 520
 521   memcpy(buf, (m_wback+m_wbackcur), s_toget);
 522
 523   m_wbackcur += s_toget;
 524   if (m_wbackcur == m_wbacksize) {
 525     free(m_wback);
 526     m_wback = (char *)NULL;
 527     m_wbacksize = 0;
 528     m_wbackcur = 0;
 529   }
 530
 531   return s_toget;
 532 }
 533
 534 size_t wxInputStream::Ungetch(const void *buf, size_t bufsize)
 535 {
 536   char *ptrback;
 537
 538   ptrback = AllocSpaceWBack(bufsize);
 539   if (!ptrback)
 540     return 0;
 541
 542   memcpy(ptrback, buf, bufsize);
 543   return bufsize;
 544 }
 545
 546 bool wxInputStream::Ungetch(char c)
 547 {
 548   char *ptrback;
 549
 550   ptrback = AllocSpaceWBack(1);
 551   if (!ptrback)
 552     return FALSE;
 553
 554   *ptrback = c;
 555   return TRUE;
 556 }
 557
 558 char wxInputStream::GetC()
 559 {
 560   char c;
 561   Read(&c, 1);
 562   return c;
 563 }
 564
 565 wxInputStream& wxInputStream::Read(void *buffer, size_t size)
 566 {
 567   size_t retsize;
 568   char *buf = (char *)buffer;
 569
 570   retsize = GetWBack(buf, size);
 571   if (retsize == size) {
 572     m_lastcount = size;
 573     m_lasterror = wxStream_NOERROR;
 574     return *this;
 575   }
 576   size     -= retsize;
 577   buf      += retsize;
 578
 579   m_lastcount = OnSysRead(buf, size);
 580   return *this;
 581 }
 582
 583 char wxInputStream::Peek()
 584 {
 585   char c;
 586
 587   Read(&c, 1);
 588   if (m_lasterror == wxStream_NOERROR) {
 589     Ungetch(c);
 590     return c;
 591   }
 592   return 0;
 593 }
 594
 595 wxInputStream& wxInputStream::Read(wxOutputStream& stream_out)
 596 {
 597   char buf[BUF_TEMP_SIZE];
 598   size_t bytes_read = BUF_TEMP_SIZE;
 599
 600   while (bytes_read == BUF_TEMP_SIZE) {
 601     bytes_read = Read(buf, bytes_read).LastRead();
 602     bytes_read = stream_out.Write(buf, bytes_read).LastWrite();
 603   }
 604   return *this;
 605 }
 606
 607 off_t wxInputStream::SeekI(off_t pos, wxSeekMode mode)
 608 {
 609   //should be check and improve, just to remove a slight bug !
 610   // I don't know whether it should be put as well in wxFileInputStream::OnSysSeek ?
 611   if (m_lasterror==wxSTREAM_EOF) m_lasterror=wxSTREAM_NOERROR;
 612
 613   return OnSysSeek(pos, mode);
 614 }
 615
 616 off_t wxInputStream::TellI() const
 617 {
 618   return OnSysTell();
 619 }
 620
 621 // --------------------
 622 // Overloaded operators
 623 // --------------------
 624
 625 #if wxUSE_SERIAL
 626 wxInputStream& wxInputStream::operator>>(wxObject *& obj)
 627 {
 628   wxObjectInputStream obj_s(*this);
 629   obj = obj_s.LoadObject();
 630   return *this;
 631 }
 632 #endif
 633
 634
 635 // ----------------------------------------------------------------------------
 636 // wxOutputStream
 637 // ----------------------------------------------------------------------------
 638 wxOutputStream::wxOutputStream()
 639   : wxStreamBase()
 640 {
 641 }
 642
 643 wxOutputStream::~wxOutputStream()
 644 {
 645 }
 646
 647 wxOutputStream& wxOutputStream::Write(const void *buffer, size_t size)
 648 {
 649   m_lastcount = OnSysWrite(buffer, size);
 650   return *this;
 651 }
 652
 653 wxOutputStream& wxOutputStream::Write(wxInputStream& stream_in)
 654 {
 655   stream_in.Read(*this);
 656   return *this;
 657 }
 658
 659 off_t wxOutputStream::TellO() const
 660 {
 661   return OnSysTell();
 662 }
 663
 664 off_t wxOutputStream::SeekO(off_t pos, wxSeekMode mode)
 665 {
 666   return OnSysSeek(pos, mode);
 667 }
 668
 669 void wxOutputStream::Sync()
 670 {
 671 }
 672
 673 #if wxUSE_SERIAL
 674 wxOutputStream& wxOutputStream::operator<<(wxObject& obj)
 675 {
 676   wxObjectOutputStream obj_s(*this);
 677   obj_s.SaveObject(obj);
 678   return *this;
 679 }
 680 #endif
 681
 682 // ----------------------------------------------------------------------------
 683 // wxCountingOutputStream
 684 // ----------------------------------------------------------------------------
 685
 686 wxCountingOutputStream::wxCountingOutputStream ()
 687   : wxOutputStream()
 688 {
 689    m_currentPos = 0;
 690 }
 691
 692 size_t wxCountingOutputStream::GetSize() const
 693 {
 694   return m_lastcount;
 695 }
 696
 697 size_t wxCountingOutputStream::OnSysWrite(const void *WXUNUSED(buffer), size_t size)
 698 {
 699   m_currentPos += size;
 700   if (m_currentPos > m_lastcount) m_lastcount = m_currentPos;
 701   return m_currentPos;
 702 }
 703
 704 off_t wxCountingOutputStream::OnSysSeek(off_t pos, wxSeekMode mode)
 705 {
 706   if (mode == wxFromStart)
 707   {
 708     m_currentPos = pos;
 709   }
 710   if (mode == wxFromEnd)
 711   {
 712     m_currentPos = m_lastcount + pos;
 713   }
 714   else
 715   {
 716     m_currentPos += pos;
 717   }
 718   if (m_currentPos > m_lastcount) m_lastcount = m_currentPos;
 719
 720   return m_currentPos;  // ?
 721 }
 722
 723 off_t wxCountingOutputStream::OnSysTell() const
 724 {
 725   return m_currentPos;  // ?
 726 }
 727
 728 // ----------------------------------------------------------------------------
 729 // wxFilterInputStream
 730 // ----------------------------------------------------------------------------
 731
 732 wxFilterInputStream::wxFilterInputStream()
 733   : wxInputStream()
 734 {
 735 }
 736
 737 wxFilterInputStream::wxFilterInputStream(wxInputStream& stream)
 738   : wxInputStream()
 739 {
 740   m_parent_i_stream = &stream;
 741 }
 742
 743 wxFilterInputStream::~wxFilterInputStream()
 744 {
 745 }
 746
 747 // ----------------------------------------------------------------------------
 748 // wxFilterOutputStream
 749 // ----------------------------------------------------------------------------
 750 wxFilterOutputStream::wxFilterOutputStream()
 751   : wxOutputStream()
 752 {
 753 }
 754
 755 wxFilterOutputStream::wxFilterOutputStream(wxOutputStream& stream)
 756   : wxOutputStream()
 757 {
 758   m_parent_o_stream = &stream;
 759 }
 760
 761 wxFilterOutputStream::~wxFilterOutputStream()
 762 {
 763 }
 764
 765 // ----------------------------------------------------------------------------
 766 // wxBufferedInputStream
 767 // ----------------------------------------------------------------------------
 768 wxBufferedInputStream::wxBufferedInputStream(wxInputStream& s)
 769   : wxFilterInputStream(s)
 770 {
 771   m_i_streambuf = new wxStreamBuffer(*this, wxStreamBuffer::read);
 772   m_i_streambuf->SetBufferIO(1024);
 773 }
 774
 775 wxBufferedInputStream::~wxBufferedInputStream()
 776 {
 777   delete m_i_streambuf;
 778 }
 779
 780 char wxBufferedInputStream::Peek()
 781 {
 782   return m_i_streambuf->Peek();
 783 }
 784
 785 wxInputStream& wxBufferedInputStream::Read(void *buffer, size_t size)
 786 {
 787   size_t retsize;
 788   char *buf = (char *)buffer;
 789
 790   retsize = GetWBack(buf, size);
 791   m_lastcount = retsize;
 792   if (retsize == size) {
 793     m_lasterror = wxStream_NOERROR;
 794     return *this;
 795   }
 796   size     -= retsize;
 797   buf      += retsize;
 798
 799   m_i_streambuf->Read(buf, size);
 800
 801   return *this;
 802 }
 803
 804 off_t wxBufferedInputStream::SeekI(off_t pos, wxSeekMode mode)
 805 {
 806   return m_i_streambuf->Seek(pos, mode);
 807 }
 808
 809 off_t wxBufferedInputStream::TellI() const
 810 {
 811   return m_i_streambuf->Tell();
 812 }
 813
 814 size_t wxBufferedInputStream::OnSysRead(void *buffer, size_t bufsize)
 815 {
 816   return m_parent_i_stream->Read(buffer, bufsize).LastRead();
 817 }
 818
 819 off_t wxBufferedInputStream::OnSysSeek(off_t seek, wxSeekMode mode)
 820 {
 821   return m_parent_i_stream->SeekI(seek, mode);
 822 }
 823
 824 off_t wxBufferedInputStream::OnSysTell() const
 825 {
 826   return m_parent_i_stream->TellI();
 827 }
 828
 829 // ----------------------------------------------------------------------------
 830 // wxBufferedOutputStream
 831 // ----------------------------------------------------------------------------
 832
 833 wxBufferedOutputStream::wxBufferedOutputStream(wxOutputStream& s)
 834   : wxFilterOutputStream(s)
 835 {
 836   m_o_streambuf = new wxStreamBuffer(*this, wxStreamBuffer::write);
 837   m_o_streambuf->SetBufferIO(1024);
 838 }
 839
 840 wxBufferedOutputStream::~wxBufferedOutputStream()
 841 {
 842   delete m_o_streambuf;
 843 }
 844
 845 wxOutputStream& wxBufferedOutputStream::Write(const void *buffer, size_t size)
 846 {
 847   m_lastcount = 0;
 848   m_o_streambuf->Write(buffer, size);
 849   return *this;
 850 }
 851
 852 off_t wxBufferedOutputStream::SeekO(off_t pos, wxSeekMode mode)
 853 {
 854   return m_o_streambuf->Seek(pos, mode);
 855 }
 856
 857 off_t wxBufferedOutputStream::TellO() const
 858 {
 859   return m_o_streambuf->Tell();
 860 }
 861
 862 void wxBufferedOutputStream::Sync()
 863 {
 864   m_o_streambuf->FlushBuffer();
 865   m_parent_o_stream->Sync();
 866 }
 867
 868 size_t wxBufferedOutputStream::OnSysWrite(const void *buffer, size_t bufsize)
 869 {
 870   return m_parent_o_stream->Write(buffer, bufsize).LastWrite();
 871 }
 872
 873 off_t wxBufferedOutputStream::OnSysSeek(off_t seek, wxSeekMode mode)
 874 {
 875   return m_parent_o_stream->SeekO(seek, mode);
 876 }
 877
 878 off_t wxBufferedOutputStream::OnSysTell() const
 879 {
 880   return m_parent_o_stream->TellO();
 881 }
 882
 883 // ----------------------------------------------------------------------------
 884 // Some IOManip function
 885 // ----------------------------------------------------------------------------
 886
 887 wxOutputStream& wxEndL(wxOutputStream& stream)
 888 {
 889 #ifdef __MSW__
 890   return stream.Write("\r\n", 2);
 891 #else
 892 #ifdef __WXMAC__
 893   return stream.Write("\r", 1);
 894 #else
 895   return stream.Write("\n", 1);
 896 #endif
 897 #endif
 898 }
 899
 900 #endif
 901   // wxUSE_STREAMS