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 = (char*)NULL;
 102     m_buffer_end = (char*)NULL;
 103     m_buffer_pos = (char*)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     switch (mode) {
 383       case wxFromStart:   diff = pos;                     break;
 384       case wxFromCurrent: diff = pos + GetIntPosition();  break;
 385       case wxFromEnd:     diff = pos + last_access;       break;
 386       default: return wxInvalidOffset;
 387     }
 388     if (diff < 0 || diff > last_access)
 389       return wxInvalidOffset;
 390     SetIntPosition(diff);
 391     return diff;
 392   }
 393
 394   switch (mode) {
 395   case wxFromStart: {
 396     // We'll try to compute an internal position later ...
 397     ret_off = m_stream->OnSysSeek(pos, wxFromStart);
 398     ResetBuffer();
 399     return ret_off;
 400   }
 401   case wxFromCurrent: {
 402     diff = pos + GetIntPosition();
 403
 404     if ( (diff > last_access) || (diff < 0) ) {
 405       // We must take into account the fact that we have read something
 406       // previously.
 407       ret_off = m_stream->OnSysSeek(diff-last_access, wxFromCurrent);
 408       ResetBuffer();
 409       return ret_off;
 410     } else {
 411       SetIntPosition(diff);
 412       return pos;
 413     }
 414   }
 415   case wxFromEnd:
 416     // Hard to compute: always seek to the requested position.
 417     ret_off = m_stream->OnSysSeek(pos, wxFromEnd);
 418     ResetBuffer();
 419     return ret_off;
 420   }
 421   return wxInvalidOffset;
 422 }
 423
 424 off_t wxStreamBuffer::Tell() const
 425 {
 426   off_t pos;
 427
 428   if (m_flushable) {
 429     pos = m_stream->OnSysTell();
 430     if (pos == wxInvalidOffset)
 431       return wxInvalidOffset;
 432     return pos - GetLastAccess() + GetIntPosition();
 433   } else
 434     return GetIntPosition();
 435 }
 436
 437 size_t wxStreamBuffer::GetDataLeft()
 438 {
 439   if (m_buffer_end == m_buffer_pos && m_flushable)
 440     FillBuffer();
 441   return m_buffer_end-m_buffer_pos;
 442 }
 443
 444 // ----------------------------------------------------------------------------
 445 // wxStreamBase
 446 // ----------------------------------------------------------------------------
 447
 448 wxStreamBase::wxStreamBase()
 449 {
 450   m_lasterror = wxStream_NOERROR;
 451   m_lastcount = 0;
 452 }
 453
 454 wxStreamBase::~wxStreamBase()
 455 {
 456 }
 457
 458 size_t wxStreamBase::OnSysRead(void *WXUNUSED(buffer), size_t WXUNUSED(size))
 459 {
 460   return 0;
 461 }
 462
 463 size_t wxStreamBase::OnSysWrite(const void *WXUNUSED(buffer), size_t WXUNUSED(bufsize))
 464 {
 465   return 0;
 466 }
 467
 468 off_t wxStreamBase::OnSysSeek(off_t WXUNUSED(seek), wxSeekMode WXUNUSED(mode))
 469 {
 470   return wxInvalidOffset;
 471 }
 472
 473 off_t wxStreamBase::OnSysTell() const
 474 {
 475   return wxInvalidOffset;
 476 }
 477
 478 // ----------------------------------------------------------------------------
 479 // wxInputStream
 480 // ----------------------------------------------------------------------------
 481
 482 wxInputStream::wxInputStream()
 483   : wxStreamBase(),
 484     m_wback(NULL), m_wbacksize(0), m_wbackcur(0)
 485 {
 486 }
 487
 488 wxInputStream::~wxInputStream()
 489 {
 490   if (m_wback)
 491     free(m_wback);
 492 }
 493
 494 char *wxInputStream::AllocSpaceWBack(size_t needed_size)
 495 {
 496   char *temp_b;
 497   size_t toget;
 498
 499   /* get number of bytes left from previous wback buffer */
 500   toget = m_wbacksize - m_wbackcur;
 501
 502   /* allocate a buffer large enough to hold prev + new data */
 503   temp_b = (char *) malloc(needed_size + toget);
 504
 505   if (!temp_b)
 506     return NULL;
 507
 508   /* copy previous data (and free old buffer) if needed */
 509   if (m_wback)
 510   {
 511     memmove(temp_b + needed_size, m_wback + m_wbackcur, toget);
 512     free(m_wback);
 513   }
 514
 515   /* done */
 516   m_wback = temp_b;
 517   m_wbackcur = 0;
 518   m_wbacksize = needed_size + toget;
 519
 520   return (char *) m_wback;
 521 }
 522
 523 size_t wxInputStream::GetWBack(char *buf, size_t bsize)
 524 {
 525   size_t s_toget = m_wbacksize-m_wbackcur;
 526
 527   if (!m_wback)
 528     return 0;
 529
 530   if (bsize < s_toget)
 531     s_toget = bsize;
 532
 533   memcpy(buf, (m_wback+m_wbackcur), s_toget);
 534
 535   m_wbackcur += s_toget;
 536   if (m_wbackcur == m_wbacksize) {
 537     free(m_wback);
 538     m_wback = (char *)NULL;
 539     m_wbacksize = 0;
 540     m_wbackcur = 0;
 541   }
 542
 543   return s_toget;
 544 }
 545
 546 size_t wxInputStream::Ungetch(const void *buf, size_t bufsize)
 547 {
 548   char *ptrback;
 549
 550   ptrback = AllocSpaceWBack(bufsize);
 551   if (!ptrback)
 552     return 0;
 553
 554   memcpy(ptrback, buf, bufsize);
 555   return bufsize;
 556 }
 557
 558 bool wxInputStream::Ungetch(char c)
 559 {
 560   char *ptrback;
 561
 562   ptrback = AllocSpaceWBack(1);
 563   if (!ptrback)
 564     return FALSE;
 565
 566   *ptrback = c;
 567   return TRUE;
 568 }
 569
 570 char wxInputStream::GetC()
 571 {
 572   char c;
 573   Read(&c, 1);
 574   return c;
 575 }
 576
 577 wxInputStream& wxInputStream::Read(void *buffer, size_t size)
 578 {
 579   size_t retsize;
 580   char *buf = (char *)buffer;
 581
 582   retsize = GetWBack(buf, size);
 583   if (retsize == size) {
 584     m_lastcount = size;
 585     m_lasterror = wxStream_NOERROR;
 586     return *this;
 587   }
 588   size -= retsize;
 589   buf  += retsize;
 590
 591   m_lastcount = OnSysRead(buf, size) + retsize;
 592   return *this;
 593 }
 594
 595 char wxInputStream::Peek()
 596 {
 597   char c;
 598
 599   Read(&c, 1);
 600   if (m_lasterror == wxStream_NOERROR) {
 601     Ungetch(c);
 602     return c;
 603   }
 604   return 0;
 605 }
 606
 607 wxInputStream& wxInputStream::Read(wxOutputStream& stream_out)
 608 {
 609   char buf[BUF_TEMP_SIZE];
 610   size_t bytes_read = BUF_TEMP_SIZE;
 611
 612   while (bytes_read == BUF_TEMP_SIZE) {
 613     bytes_read = Read(buf, bytes_read).LastRead();
 614     bytes_read = stream_out.Write(buf, bytes_read).LastWrite();
 615   }
 616   return *this;
 617 }
 618
 619 off_t wxInputStream::SeekI(off_t pos, wxSeekMode mode)
 620 {
 621   // Should be check and improve, just to remove a slight bug !
 622   // I don't know whether it should be put as well in wxFileInputStream::OnSysSeek ?
 623   if (m_lasterror==wxSTREAM_EOF)
 624      m_lasterror=wxSTREAM_NOERROR;
 625
 626   // A call to SeekI() will automatically invalidate any previous call
 627   // to Ungetch(), otherwise it would be possible to SeeI() to one
 628   // one position, unread some bytes there, SeekI() to another position
 629   // and the data would be corrupted.
 630   if (m_wback) {
 631     free(m_wback);
 632     m_wback = (char*) NULL;
 633     m_wbacksize = 0;
 634     m_wbackcur = 0;
 635   }
 636
 637   return OnSysSeek(pos, mode);
 638 }
 639
 640 off_t wxInputStream::TellI() const
 641 {
 642   return OnSysTell();
 643 }
 644
 645 // --------------------
 646 // Overloaded operators
 647 // --------------------
 648
 649 #if wxUSE_SERIAL
 650 wxInputStream& wxInputStream::operator>>(wxObject *& obj)
 651 {
 652   wxObjectInputStream obj_s(*this);
 653   obj = obj_s.LoadObject();
 654   return *this;
 655 }
 656 #endif
 657
 658
 659 // ----------------------------------------------------------------------------
 660 // wxOutputStream
 661 // ----------------------------------------------------------------------------
 662 wxOutputStream::wxOutputStream()
 663   : wxStreamBase()
 664 {
 665 }
 666
 667 wxOutputStream::~wxOutputStream()
 668 {
 669 }
 670
 671 wxOutputStream& wxOutputStream::Write(const void *buffer, size_t size)
 672 {
 673   m_lastcount = OnSysWrite(buffer, size);
 674   return *this;
 675 }
 676
 677 wxOutputStream& wxOutputStream::Write(wxInputStream& stream_in)
 678 {
 679   stream_in.Read(*this);
 680   return *this;
 681 }
 682
 683 off_t wxOutputStream::TellO() const
 684 {
 685   return OnSysTell();
 686 }
 687
 688 off_t wxOutputStream::SeekO(off_t pos, wxSeekMode mode)
 689 {
 690   return OnSysSeek(pos, mode);
 691 }
 692
 693 void wxOutputStream::Sync()
 694 {
 695 }
 696
 697 #if wxUSE_SERIAL
 698 wxOutputStream& wxOutputStream::operator<<(wxObject& obj)
 699 {
 700   wxObjectOutputStream obj_s(*this);
 701   obj_s.SaveObject(obj);
 702   return *this;
 703 }
 704 #endif
 705
 706 // ----------------------------------------------------------------------------
 707 // wxCountingOutputStream
 708 // ----------------------------------------------------------------------------
 709
 710 wxCountingOutputStream::wxCountingOutputStream ()
 711   : wxOutputStream()
 712 {
 713    m_currentPos = 0;
 714 }
 715
 716 size_t wxCountingOutputStream::GetSize() const
 717 {
 718   return m_lastcount;
 719 }
 720
 721 size_t wxCountingOutputStream::OnSysWrite(const void *WXUNUSED(buffer), size_t size)
 722 {
 723   m_currentPos += size;
 724   if (m_currentPos > m_lastcount) m_lastcount = m_currentPos;
 725   return m_currentPos;
 726 }
 727
 728 off_t wxCountingOutputStream::OnSysSeek(off_t pos, wxSeekMode mode)
 729 {
 730   if (mode == wxFromStart)
 731   {
 732     m_currentPos = pos;
 733   }
 734   if (mode == wxFromEnd)
 735   {
 736     m_currentPos = m_lastcount + pos;
 737   }
 738   else
 739   {
 740     m_currentPos += pos;
 741   }
 742   if (m_currentPos > m_lastcount) m_lastcount = m_currentPos;
 743
 744   return m_currentPos;  // ?
 745 }
 746
 747 off_t wxCountingOutputStream::OnSysTell() const
 748 {
 749   return m_currentPos;  // ?
 750 }
 751
 752 // ----------------------------------------------------------------------------
 753 // wxFilterInputStream
 754 // ----------------------------------------------------------------------------
 755
 756 wxFilterInputStream::wxFilterInputStream()
 757   : wxInputStream()
 758 {
 759 }
 760
 761 wxFilterInputStream::wxFilterInputStream(wxInputStream& stream)
 762   : wxInputStream()
 763 {
 764   m_parent_i_stream = &stream;
 765 }
 766
 767 wxFilterInputStream::~wxFilterInputStream()
 768 {
 769 }
 770
 771 // ----------------------------------------------------------------------------
 772 // wxFilterOutputStream
 773 // ----------------------------------------------------------------------------
 774 wxFilterOutputStream::wxFilterOutputStream()
 775   : wxOutputStream()
 776 {
 777 }
 778
 779 wxFilterOutputStream::wxFilterOutputStream(wxOutputStream& stream)
 780   : wxOutputStream()
 781 {
 782   m_parent_o_stream = &stream;
 783 }
 784
 785 wxFilterOutputStream::~wxFilterOutputStream()
 786 {
 787 }
 788
 789 // ----------------------------------------------------------------------------
 790 // wxBufferedInputStream
 791 // ----------------------------------------------------------------------------
 792 wxBufferedInputStream::wxBufferedInputStream(wxInputStream& s)
 793   : wxFilterInputStream(s)
 794 {
 795   m_i_streambuf = new wxStreamBuffer(*this, wxStreamBuffer::read);
 796   m_i_streambuf->SetBufferIO(1024);
 797 }
 798
 799 wxBufferedInputStream::~wxBufferedInputStream()
 800 {
 801   delete m_i_streambuf;
 802 }
 803
 804 char wxBufferedInputStream::Peek()
 805 {
 806   return m_i_streambuf->Peek();
 807 }
 808
 809 wxInputStream& wxBufferedInputStream::Read(void *buffer, size_t size)
 810 {
 811   size_t retsize;
 812   char *buf = (char *)buffer;
 813
 814   retsize = GetWBack(buf, size);
 815   m_lastcount = retsize;
 816   if (retsize == size) {
 817     m_lasterror = wxStream_NOERROR;
 818     return *this;
 819   }
 820   size     -= retsize;
 821   buf      += retsize;
 822
 823   m_i_streambuf->Read(buf, size);
 824
 825   return *this;
 826 }
 827
 828 off_t wxBufferedInputStream::SeekI(off_t pos, wxSeekMode mode)
 829 {
 830   return m_i_streambuf->Seek(pos, mode);
 831 }
 832
 833 off_t wxBufferedInputStream::TellI() const
 834 {
 835   return m_i_streambuf->Tell();
 836 }
 837
 838 size_t wxBufferedInputStream::OnSysRead(void *buffer, size_t bufsize)
 839 {
 840   return m_parent_i_stream->Read(buffer, bufsize).LastRead();
 841 }
 842
 843 off_t wxBufferedInputStream::OnSysSeek(off_t seek, wxSeekMode mode)
 844 {
 845   return m_parent_i_stream->SeekI(seek, mode);
 846 }
 847
 848 off_t wxBufferedInputStream::OnSysTell() const
 849 {
 850   return m_parent_i_stream->TellI();
 851 }
 852
 853 // ----------------------------------------------------------------------------
 854 // wxBufferedOutputStream
 855 // ----------------------------------------------------------------------------
 856
 857 wxBufferedOutputStream::wxBufferedOutputStream(wxOutputStream& s)
 858   : wxFilterOutputStream(s)
 859 {
 860   m_o_streambuf = new wxStreamBuffer(*this, wxStreamBuffer::write);
 861   m_o_streambuf->SetBufferIO(1024);
 862 }
 863
 864 wxBufferedOutputStream::~wxBufferedOutputStream()
 865 {
 866   Sync();
 867   delete m_o_streambuf;
 868 }
 869
 870 wxOutputStream& wxBufferedOutputStream::Write(const void *buffer, size_t size)
 871 {
 872   m_lastcount = 0;
 873   m_o_streambuf->Write(buffer, size);
 874   return *this;
 875 }
 876
 877 off_t wxBufferedOutputStream::SeekO(off_t pos, wxSeekMode mode)
 878 {
 879   Sync();
 880   return m_o_streambuf->Seek(pos, mode);
 881 }
 882
 883 off_t wxBufferedOutputStream::TellO() const
 884 {
 885   return m_o_streambuf->Tell();
 886 }
 887
 888 void wxBufferedOutputStream::Sync()
 889 {
 890   m_o_streambuf->FlushBuffer();
 891   m_parent_o_stream->Sync();
 892 }
 893
 894 size_t wxBufferedOutputStream::OnSysWrite(const void *buffer, size_t bufsize)
 895 {
 896   return m_parent_o_stream->Write(buffer, bufsize).LastWrite();
 897 }
 898
 899 off_t wxBufferedOutputStream::OnSysSeek(off_t seek, wxSeekMode mode)
 900 {
 901   return m_parent_o_stream->SeekO(seek, mode);
 902 }
 903
 904 off_t wxBufferedOutputStream::OnSysTell() const
 905 {
 906   return m_parent_o_stream->TellO();
 907 }
 908
 909 // ----------------------------------------------------------------------------
 910 // Some IOManip function
 911 // ----------------------------------------------------------------------------
 912
 913 wxOutputStream& wxEndL(wxOutputStream& stream)
 914 {
 915 #ifdef __MSW__
 916   return stream.Write("\r\n", 2);
 917 #else
 918 #ifdef __WXMAC__
 919   return stream.Write("\r", 1);
 920 #else
 921   return stream.Write("\n", 1);
 922 #endif
 923 #endif
 924 }
 925
 926 #endif
 927   // wxUSE_STREAMS