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 #include <ctype.h>
  19 #include <wx/stream.h>
  20 #include <wx/datstrm.h>
  21 #include <wx/objstrm.h>
  22
  23 #ifdef __BORLANDC__
  24 #pragma hdrstop
  25 #endif
  26
  27 #define BUF_TEMP_SIZE 10000
  28
  29 // ----------------------------------------------------------------------------
  30 // wxStreamBuffer
  31 // ----------------------------------------------------------------------------
  32
  33 #define CHECK_ERROR(err) \
  34    if (m_stream->m_lasterror == wxStream_NOERROR) \
  35      m_stream->m_lasterror = err
  36
  37 wxStreamBuffer::wxStreamBuffer(wxStreamBase& stream, BufMode mode)
  38   : m_buffer_start(NULL), m_buffer_end(NULL), m_buffer_pos(NULL),
  39     m_buffer_size(0), m_wback(NULL), m_wbacksize(0), m_wbackcur(0),
  40     m_fixed(TRUE), m_flushable(TRUE), m_stream(&stream),
  41     m_mode(mode), m_destroybuf(FALSE), m_destroystream(FALSE)
  42 {
  43 }
  44
  45 wxStreamBuffer::wxStreamBuffer(BufMode mode)
  46   : m_buffer_start(NULL), m_buffer_end(NULL), m_buffer_pos(NULL),
  47     m_buffer_size(0), m_wback(NULL), m_wbacksize(0), m_wbackcur(0),
  48     m_fixed(TRUE), m_flushable(FALSE), m_stream(NULL),
  49     m_mode(mode), m_destroybuf(FALSE), m_destroystream(TRUE)
  50 {
  51   m_stream = new wxStreamBase();
  52 }
  53
  54 wxStreamBuffer::wxStreamBuffer(const wxStreamBuffer& buffer)
  55 {
  56   m_buffer_start = buffer.m_buffer_start;
  57   m_buffer_end = buffer.m_buffer_end;
  58   m_buffer_pos = buffer.m_buffer_pos;
  59   m_buffer_size = buffer.m_buffer_size;
  60   m_fixed = buffer.m_fixed;
  61   m_flushable = buffer.m_flushable;
  62   m_stream = buffer.m_stream;
  63   m_mode = buffer.m_mode;
  64   m_destroybuf = FALSE;
  65   m_destroystream = FALSE;
  66   m_wback = NULL;
  67   m_wbacksize = 0;
  68   m_wbackcur = 0;
  69 }
  70
  71 wxStreamBuffer::~wxStreamBuffer()
  72 {
  73   if (m_wback)
  74     free(m_wback);
  75   if (m_destroybuf)
  76     wxDELETEA(m_buffer_start);
  77   if (m_destroystream)
  78     delete m_stream;
  79 }
  80
  81 size_t wxStreamBuffer::WriteBack(const char *buf, size_t bufsize)
  82 {
  83   char *ptrback;
  84
  85   ptrback = AllocSpaceWBack(bufsize);
  86   if (!ptrback)
  87     return 0;
  88
  89   memcpy(ptrback, buf, bufsize);
  90   return bufsize;
  91 }
  92
  93 bool wxStreamBuffer::WriteBack(char c)
  94 {
  95   char *ptrback;
  96
  97   ptrback = AllocSpaceWBack(1);
  98   if (!ptrback)
  99     return FALSE;
 100
 101   *ptrback = c;
 102   return TRUE;
 103 }
 104
 105 void wxStreamBuffer::SetBufferIO(char *buffer_start, char *buffer_end)
 106 {
 107   if (m_destroybuf)
 108     wxDELETEA(m_buffer_start);
 109   m_buffer_start = buffer_start;
 110   m_buffer_end   = buffer_end;
 111
 112   m_buffer_size = m_buffer_end-m_buffer_start;
 113   m_destroybuf = FALSE;
 114   ResetBuffer();
 115 }
 116
 117 void wxStreamBuffer::SetBufferIO(size_t bufsize)
 118 {
 119   char *b_start;
 120
 121   if (m_destroybuf)
 122     wxDELETEA(m_buffer_start);
 123
 124   if (!bufsize) {
 125     m_buffer_start = NULL;
 126     m_buffer_end = NULL;
 127     m_buffer_pos = NULL;
 128     m_buffer_size = 0;
 129     return;
 130   }
 131
 132   b_start = new char[bufsize];
 133   SetBufferIO(b_start, b_start + bufsize);
 134   m_destroybuf = TRUE;
 135 }
 136
 137 void wxStreamBuffer::ResetBuffer()
 138 {
 139   m_stream->m_lasterror = wxStream_NOERROR;
 140   if (m_mode == read)
 141     m_buffer_pos = m_buffer_end;
 142   else
 143     m_buffer_pos = m_buffer_start;
 144 }
 145
 146 char *wxStreamBuffer::AllocSpaceWBack(size_t needed_size)
 147 {
 148   char *temp_b;
 149
 150   m_wbacksize += needed_size;
 151
 152   if (!m_wback)
 153     temp_b = (char *)malloc(m_wbacksize);
 154   else
 155     temp_b = (char *)realloc(m_wback, m_wbacksize);
 156
 157   if (!temp_b)
 158     return NULL;
 159   m_wback = temp_b;
 160
 161   return (char *)(m_wback+(m_wbacksize-needed_size));
 162 }
 163
 164 size_t wxStreamBuffer::GetWBack(char *buf, size_t bsize)
 165 {
 166   size_t s_toget = m_wbacksize-m_wbackcur;
 167
 168   if (bsize < s_toget)
 169     s_toget = bsize;
 170
 171   memcpy(buf, (m_wback+m_wbackcur), s_toget);
 172
 173   m_wbackcur += s_toget;
 174   if (m_wbackcur == m_wbacksize) {
 175     free(m_wback);
 176     m_wback = (char *)NULL;
 177     m_wbacksize = 0;
 178     m_wbackcur = 0;
 179   }
 180
 181   return s_toget;
 182 }
 183
 184 bool wxStreamBuffer::FillBuffer()
 185 {
 186   size_t count;
 187
 188   count = m_stream->OnSysRead(m_buffer_start, m_buffer_size);
 189   m_buffer_end = m_buffer_start+count;
 190   m_buffer_pos = m_buffer_start;
 191
 192   if (count == 0)
 193     return FALSE;
 194   return TRUE;
 195 }
 196
 197 bool wxStreamBuffer::FlushBuffer()
 198 {
 199   size_t count, current;
 200
 201   if (m_buffer_pos == m_buffer_start || !m_flushable)
 202     return FALSE;
 203
 204   current = m_buffer_pos-m_buffer_start;
 205   count = m_stream->OnSysWrite(m_buffer_start, current);
 206   if (count != current)
 207     return FALSE;
 208   m_buffer_pos = m_buffer_start;
 209
 210   return TRUE;
 211 }
 212
 213 void wxStreamBuffer::GetFromBuffer(void *buffer, size_t size)
 214 {
 215   size_t s_toget = m_buffer_end-m_buffer_pos;
 216
 217   if (size < s_toget)
 218     s_toget = size;
 219
 220   memcpy(buffer, m_buffer_pos, s_toget);
 221   m_buffer_pos += s_toget;
 222 }
 223
 224 void wxStreamBuffer::PutToBuffer(const void *buffer, size_t size)
 225 {
 226   size_t s_toput = m_buffer_end-m_buffer_pos;
 227
 228   if (s_toput < size && !m_fixed) {
 229     m_buffer_start = (char *)realloc(m_buffer_start, m_buffer_size+size);
 230     // I round a bit
 231     m_buffer_size += size;
 232     m_buffer_end = m_buffer_start+m_buffer_size;
 233     s_toput = size;
 234   }
 235   if (s_toput > size)
 236     s_toput = size;
 237   memcpy(m_buffer_pos, buffer, s_toput);
 238   m_buffer_pos += s_toput;
 239 }
 240
 241 void wxStreamBuffer::PutChar(char c)
 242 {
 243   wxASSERT(m_stream != NULL);
 244
 245   if (!m_buffer_size) {
 246     m_stream->OnSysWrite(&c, 1);
 247     return;
 248   }
 249
 250   if (!GetDataLeft() && !FlushBuffer()) {
 251     CHECK_ERROR(wxStream_READ_ERR);
 252     return;
 253   }
 254
 255   PutToBuffer(&c, 1);
 256   m_stream->m_lastcount = 1;
 257 }
 258
 259 char wxStreamBuffer::GetChar()
 260 {
 261   char c;
 262
 263   wxASSERT(m_stream != NULL);
 264
 265   if (!m_buffer_size) {
 266     m_stream->OnSysRead(&c, 1);
 267     return c;
 268   }
 269
 270   if (!GetDataLeft()) {
 271     CHECK_ERROR(wxStream_READ_ERR);
 272     return 0;
 273   }
 274
 275   GetFromBuffer(&c, 1);
 276   m_stream->m_lastcount = 1;
 277   return c;
 278 }
 279
 280 size_t wxStreamBuffer::Read(void *buffer, size_t size)
 281 {
 282   wxASSERT(m_stream != NULL);
 283
 284   // ------------------
 285   // Buffering disabled
 286   // ------------------
 287
 288   m_stream->m_lasterror = wxStream_NOERROR;
 289   m_stream->m_lastcount = GetWBack((char *)buffer, size);
 290   size -= m_stream->m_lastcount;
 291   if (size == 0)
 292     return m_stream->m_lastcount;
 293
 294   buffer = (void *)((char *)buffer+m_stream->m_lastcount);
 295
 296   if (!m_buffer_size)
 297     return (m_stream->m_lastcount += m_stream->OnSysRead(buffer, size));
 298
 299   // -----------------
 300   // Buffering enabled
 301   // -----------------
 302   size_t buf_left, orig_size = size;
 303
 304   while (size > 0) {
 305     buf_left = GetDataLeft();
 306
 307     // First case: the requested buffer is larger than the stream buffer,
 308     //             we split it.
 309     if (size > buf_left) {
 310       GetFromBuffer(buffer, buf_left);
 311       size  -= buf_left;
 312       buffer = (char *)buffer + buf_left; // ANSI C++ violation.
 313
 314       if (!FillBuffer()) {
 315         CHECK_ERROR(wxStream_READ_ERR);
 316         return (m_stream->m_lastcount = orig_size-size);
 317       }
 318     } else {
 319
 320       // Second case: we just copy from the stream buffer.
 321       GetFromBuffer(buffer, size);
 322       break;
 323     }
 324   }
 325   return (m_stream->m_lastcount += orig_size);
 326 }
 327
 328 size_t wxStreamBuffer::Read(wxStreamBuffer *s_buf)
 329 {
 330   char buf[BUF_TEMP_SIZE];
 331   size_t s = 0, bytes_read = BUF_TEMP_SIZE;
 332
 333   while (bytes_read == BUF_TEMP_SIZE) {
 334     bytes_read = Read(buf, bytes_read);
 335     bytes_read = s_buf->Write(buf, bytes_read);
 336     s += bytes_read;
 337   }
 338   return s;
 339 }
 340
 341 size_t wxStreamBuffer::Write(const void *buffer, size_t size)
 342 {
 343   wxASSERT(m_stream != NULL);
 344
 345   // ------------------
 346   // Buffering disabled
 347   // ------------------
 348
 349   m_stream->m_lasterror = wxStream_NOERROR;
 350   if (!m_buffer_size)
 351     return (m_stream->m_lastcount = m_stream->OnSysWrite(buffer, size));
 352
 353   // ------------------
 354   // Buffering enabled
 355   // ------------------
 356
 357   size_t buf_left, orig_size = size;
 358
 359   while (size > 0) {
 360     buf_left = m_buffer_end - m_buffer_pos;
 361
 362     // First case: the buffer to write is larger than the stream buffer,
 363     //             we split it
 364     if (size > buf_left) {
 365       PutToBuffer(buffer, buf_left);
 366       size -= buf_left;
 367       buffer = (char *)buffer + buf_left; // ANSI C++ violation.
 368
 369       if (!FlushBuffer()) {
 370         CHECK_ERROR(wxStream_WRITE_ERR);
 371         return (m_stream->m_lastcount = orig_size-size);
 372       }
 373
 374       m_buffer_pos = m_buffer_start;
 375
 376     } else {
 377
 378       // Second case: just copy it in the stream buffer.
 379       PutToBuffer(buffer, size);
 380       break;
 381     }
 382   }
 383   return (m_stream->m_lastcount = orig_size);
 384 }
 385
 386 size_t wxStreamBuffer::Write(wxStreamBuffer *sbuf)
 387 {
 388   char buf[BUF_TEMP_SIZE];
 389   size_t s = 0, bytes_count = BUF_TEMP_SIZE, b_count2;
 390
 391   while (bytes_count == BUF_TEMP_SIZE) {
 392     b_count2 = sbuf->Read(buf, bytes_count);
 393     bytes_count = Write(buf, b_count2);
 394     if (b_count2 > bytes_count)
 395       sbuf->WriteBack(buf+bytes_count, b_count2-bytes_count);
 396     s += bytes_count;
 397   }
 398   return s;
 399 }
 400
 401 off_t wxStreamBuffer::Seek(off_t pos, wxSeekMode mode)
 402 {
 403   off_t ret_off, diff, last_access;
 404
 405   last_access = GetLastAccess();
 406
 407   if (!m_flushable) {
 408     diff = pos + GetIntPosition();
 409     if (diff < 0 || diff > last_access)
 410       return wxInvalidOffset;
 411     SetIntPosition(diff);
 412     return diff;
 413   }
 414
 415   switch (mode) {
 416   case wxFromStart: {
 417     // We'll try to compute an internal position later ...
 418     ret_off = m_stream->OnSysSeek(pos, wxFromStart);
 419     ResetBuffer();
 420     return ret_off;
 421   }
 422   case wxFromCurrent: {
 423     diff = pos + GetIntPosition();
 424
 425     if ( (diff > last_access) || (diff < 0) ) {
 426       ret_off = m_stream->OnSysSeek(pos, wxFromCurrent);
 427       ResetBuffer();
 428       return ret_off;
 429     } else {
 430       SetIntPosition(diff);
 431       return pos;
 432     }
 433   }
 434   case wxFromEnd:
 435     // Hard to compute: always seek to the requested position.
 436     ret_off = m_stream->OnSysSeek(pos, wxFromEnd);
 437     ResetBuffer();
 438     return ret_off;
 439   }
 440   return wxInvalidOffset;
 441 }
 442
 443 off_t wxStreamBuffer::Tell() const
 444 {
 445   off_t pos;
 446
 447   if (m_flushable) {
 448     pos = m_stream->OnSysTell();
 449     if (pos == wxInvalidOffset)
 450       return wxInvalidOffset;
 451     return pos - GetLastAccess() + GetIntPosition();
 452   } else
 453     return GetIntPosition();
 454 }
 455
 456 size_t wxStreamBuffer::GetDataLeft()
 457 {
 458   if (m_buffer_end == m_buffer_pos && m_flushable)
 459     FillBuffer();
 460   return m_buffer_end-m_buffer_pos;
 461 }
 462
 463 // ----------------------------------------------------------------------------
 464 // wxStreamBase
 465 // ----------------------------------------------------------------------------
 466
 467 wxStreamBase::wxStreamBase()
 468 {
 469   m_lasterror = wxStream_NOERROR;
 470   m_lastcount = 0;
 471 }
 472
 473 wxStreamBase::~wxStreamBase()
 474 {
 475 }
 476
 477 size_t wxStreamBase::OnSysRead(void *WXUNUSED(buffer), size_t WXUNUSED(size))
 478 {
 479   return 0;
 480 }
 481
 482 size_t wxStreamBase::OnSysWrite(const void *WXUNUSED(buffer), size_t WXUNUSED(bufsize))
 483 {
 484   return 0;
 485 }
 486
 487 off_t wxStreamBase::OnSysSeek(off_t WXUNUSED(seek), wxSeekMode WXUNUSED(mode))
 488 {
 489   return wxInvalidOffset;
 490 }
 491
 492 off_t wxStreamBase::OnSysTell() const
 493 {
 494   return wxInvalidOffset;
 495 }
 496
 497 // ----------------------------------------------------------------------------
 498 // wxInputStream
 499 // ----------------------------------------------------------------------------
 500
 501 wxInputStream::wxInputStream()
 502   : wxStreamBase()
 503 {
 504   m_i_destroybuf = TRUE;
 505   m_i_streambuf = new wxStreamBuffer(*this, wxStreamBuffer::read);
 506 }
 507
 508 wxInputStream::wxInputStream(wxStreamBuffer *buffer)
 509   : wxStreamBase()
 510 {
 511   m_i_destroybuf = FALSE;
 512   m_i_streambuf = buffer;
 513 }
 514
 515 wxInputStream::~wxInputStream()
 516 {
 517   if (m_i_destroybuf)
 518     delete m_i_streambuf;
 519 }
 520
 521 char wxInputStream::GetC()
 522 {
 523   char c;
 524   m_i_streambuf->Read(&c, 1);
 525   return c;
 526 }
 527
 528 wxInputStream& wxInputStream::Read(void *buffer, size_t size)
 529 {
 530   m_i_streambuf->Read(buffer, size);
 531   // wxStreamBuffer sets all variables for us
 532   return *this;
 533 }
 534
 535 char wxInputStream::Peek()
 536 {
 537   m_i_streambuf->GetDataLeft();
 538
 539   return *(m_i_streambuf->GetBufferPos());
 540 }
 541
 542
 543 wxInputStream& wxInputStream::Read(wxOutputStream& stream_out)
 544 {
 545   char buf[BUF_TEMP_SIZE];
 546   size_t bytes_read = BUF_TEMP_SIZE;
 547
 548   while (bytes_read == BUF_TEMP_SIZE) {
 549     bytes_read = Read(buf, bytes_read).LastRead();
 550     bytes_read = stream_out.Write(buf, bytes_read).LastWrite();
 551   }
 552   return *this;
 553 }
 554
 555 off_t wxInputStream::SeekI(off_t pos, wxSeekMode mode)
 556 {
 557   return m_i_streambuf->Seek(pos, mode);
 558 }
 559
 560 off_t wxInputStream::TellI() const
 561 {
 562   return m_i_streambuf->Tell();
 563 }
 564
 565 // --------------------
 566 // Overloaded operators
 567 // --------------------
 568
 569 wxInputStream& wxInputStream::operator>>(wxString& line)
 570 {
 571   wxDataInputStream s(*this);
 572
 573   line = s.ReadLine();
 574   return *this;
 575 }
 576
 577 wxInputStream& wxInputStream::operator>>(char& c)
 578 {
 579   c = GetC();
 580   return *this;
 581 }
 582
 583 wxInputStream& wxInputStream::operator>>(short& i)
 584 {
 585   long l;
 586
 587   *this >> l;
 588   i = (short)l;
 589   return *this;
 590 }
 591
 592 wxInputStream& wxInputStream::operator>>(int& i)
 593 {
 594   long l;
 595
 596   *this >> l;
 597   i = (short)l;
 598   return *this;
 599 }
 600
 601 wxInputStream& wxInputStream::operator>>(long& i)
 602 {
 603   /* I only implemented a simple integer parser */
 604   int c, sign;
 605
 606   while (isspace( c = GetC() ) )
 607      /* Do nothing */ ;
 608
 609   i = 0;
 610   if (! (c == '-' || isdigit(c)) ) {
 611     InputStreamBuffer()->WriteBack(c);
 612     return *this;
 613   }
 614
 615   if (c == '-') {
 616     sign = -1;
 617     c = GetC();
 618   } else
 619     sign = 1;
 620
 621   while (isdigit(c)) {
 622     i = i*10 + c;
 623     c = GetC();
 624   }
 625
 626   i *= sign;
 627
 628   return *this;
 629 }
 630
 631 wxInputStream& wxInputStream::operator>>(double& f)
 632 {
 633   /* I only implemented a simple float parser */
 634   int c, sign;
 635
 636   while (isspace( c = GetC() ) )
 637      /* Do nothing */ ;
 638
 639   f = 0.0;
 640   if (! (c == '-' || isdigit(c)) ) {
 641     InputStreamBuffer()->WriteBack(c);
 642     return *this;
 643   }
 644
 645   if (c == '-') {
 646     sign = -1;
 647     c = GetC();
 648   } else
 649     sign = 1;
 650
 651   while (isdigit(c)) {
 652     f = f*10 + (c - '0');
 653     c = GetC();
 654   }
 655
 656   if (c == '.') {
 657     double f_multiplicator = (double) 0.1;
 658     c = GetC();
 659
 660     while (isdigit(c)) {
 661       f += (c-'0')*f_multiplicator;
 662       f_multiplicator /= 10;
 663       c = GetC();
 664     }
 665   }
 666
 667   f *= sign;
 668
 669   return *this;
 670 }
 671
 672 #if wxUSE_SERIAL
 673 wxInputStream& wxInputStream::operator>>(wxObject *& obj)
 674 {
 675   wxObjectInputStream obj_s(*this);
 676   obj = obj_s.LoadObject();
 677   return *this;
 678 }
 679 #endif
 680
 681
 682 // ----------------------------------------------------------------------------
 683 // wxOutputStream
 684 // ----------------------------------------------------------------------------
 685 wxOutputStream::wxOutputStream()
 686   : wxStreamBase()
 687 {
 688   m_o_destroybuf = TRUE;
 689   m_o_streambuf = new wxStreamBuffer(*this, wxStreamBuffer::write);
 690 }
 691
 692 wxOutputStream::wxOutputStream(wxStreamBuffer *buffer)
 693   : wxStreamBase()
 694 {
 695   m_o_destroybuf = FALSE;
 696   m_o_streambuf = buffer;
 697 }
 698
 699 wxOutputStream::~wxOutputStream()
 700 {
 701   if (m_o_destroybuf)
 702     delete m_o_streambuf;
 703 }
 704
 705 wxOutputStream& wxOutputStream::Write(const void *buffer, size_t size)
 706 {
 707   m_o_streambuf->Write(buffer, size);
 708   return *this;
 709 }
 710
 711 wxOutputStream& wxOutputStream::Write(wxInputStream& stream_in)
 712 {
 713   stream_in.Read(*this);
 714   return *this;
 715 }
 716
 717 off_t wxOutputStream::TellO() const
 718 {
 719   return m_o_streambuf->Tell();
 720 }
 721
 722 off_t wxOutputStream::SeekO(off_t pos, wxSeekMode mode)
 723 {
 724   return m_o_streambuf->Seek(pos, mode);
 725 }
 726
 727 void wxOutputStream::Sync()
 728 {
 729   m_o_streambuf->FlushBuffer();
 730 }
 731
 732 wxOutputStream& wxOutputStream::operator<<(const char *string)
 733 {
 734   return Write(string, strlen(string));
 735 }
 736
 737 wxOutputStream& wxOutputStream::operator<<(wxString& string)
 738 {
 739   return Write(string, string.Len());
 740 }
 741
 742 wxOutputStream& wxOutputStream::operator<<(char c)
 743 {
 744   return Write(&c, 1);
 745 }
 746
 747 wxOutputStream& wxOutputStream::operator<<(short i)
 748 {
 749   wxString strint;
 750
 751   strint.Printf("%i", i);
 752   return Write(strint, strint.Len());
 753 }
 754
 755 wxOutputStream& wxOutputStream::operator<<(int i)
 756 {
 757   wxString strint;
 758
 759   strint.Printf("%i", i);
 760   return Write(strint, strint.Len());
 761 }
 762
 763 wxOutputStream& wxOutputStream::operator<<(long i)
 764 {
 765   wxString strlong;
 766
 767   strlong.Printf("%i", i);
 768   return Write((const char *)strlong, strlong.Len());
 769 }
 770
 771 wxOutputStream& wxOutputStream::operator<<(double f)
 772 {
 773   wxString strfloat;
 774
 775   strfloat.Printf("%f", f);
 776   return Write(strfloat, strfloat.Len());
 777 }
 778
 779 #if wxUSE_SERIAL
 780 wxOutputStream& wxOutputStream::operator<<(wxObject& obj)
 781 {
 782   wxObjectOutputStream obj_s(*this);
 783   obj_s.SaveObject(obj);
 784   return *this;
 785 }
 786 #endif
 787
 788 // ----------------------------------------------------------------------------
 789 // wxFilterInputStream
 790 // ----------------------------------------------------------------------------
 791 wxFilterInputStream::wxFilterInputStream()
 792   : wxInputStream(NULL)
 793 {
 794   // WARNING streambuf set to NULL !
 795 }
 796
 797 wxFilterInputStream::wxFilterInputStream(wxInputStream& stream)
 798   : wxInputStream(stream.InputStreamBuffer())
 799 {
 800   m_parent_i_stream = &stream;
 801 }
 802
 803 wxFilterInputStream::~wxFilterInputStream()
 804 {
 805 }
 806
 807 // ----------------------------------------------------------------------------
 808 // wxFilterOutputStream
 809 // ----------------------------------------------------------------------------
 810 wxFilterOutputStream::wxFilterOutputStream()
 811   : wxOutputStream(NULL)
 812 {
 813 }
 814
 815 wxFilterOutputStream::wxFilterOutputStream(wxOutputStream& stream)
 816   : wxOutputStream(stream.OutputStreamBuffer())
 817 {
 818   m_parent_o_stream = &stream;
 819 }
 820
 821 wxFilterOutputStream::~wxFilterOutputStream()
 822 {
 823 }
 824
 825 // ----------------------------------------------------------------------------
 826 // Some IOManip function
 827 // ----------------------------------------------------------------------------
 828
 829 wxOutputStream& wxEndL(wxOutputStream& stream)
 830 {
 831 #ifdef __MSW__
 832   return stream.Write("\r\n", 2);
 833 #else
 834   return stream.Write("\n", 1);
 835 #endif
 836 }