X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/fcc6dddd1f1da49f94767ff148eaa3f1d3ca9367..748a3af8e74ce74fe143650af0b2da2534c70d45:/src/common/stream.cpp

diff --git a/src/common/stream.cpp b/src/common/stream.cpp
index 1b0e66c82e..310f1ee7e0 100644
--- a/src/common/stream.cpp
+++ b/src/common/stream.cpp
@@ -15,632 +15,933 @@
 
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
-#include <ctype.h>
-#include <wx/stream.h>
-#include <wx/datstrm.h>
-#include <wx/objstrm.h>
 
 #ifdef __BORLANDC__
-#pragma hdrstop
+  #pragma hdrstop
+#endif
+
+#ifndef WX_PRECOMP
+  #include "wx/defs.h"
 #endif
 
+#if wxUSE_STREAMS
+
+#include <ctype.h>
+#include "wx/stream.h"
+#include "wx/datstrm.h"
+#include "wx/objstrm.h"
+
+#define BUF_TEMP_SIZE 10000
+
 // ----------------------------------------------------------------------------
 // wxStreamBuffer
 // ----------------------------------------------------------------------------
 
-wxStreamBuffer::wxStreamBuffer(wxInputStream& i_stream)
+#define CHECK_ERROR(err) \
+   if (m_stream->m_lasterror == wxStream_NOERROR) \
+     m_stream->m_lasterror = err
+
+wxStreamBuffer::wxStreamBuffer(wxStreamBase& stream, BufMode mode)
   : m_buffer_start(NULL), m_buffer_end(NULL), m_buffer_pos(NULL),
-    m_buffer_size(0), m_istream(&i_stream), m_ostream(NULL)
+    m_buffer_size(0), m_fixed(TRUE), m_flushable(TRUE), m_stream(&stream),
+    m_mode(mode), m_destroybuf(FALSE), m_destroystream(FALSE)
 {
 }
 
-wxStreamBuffer::wxStreamBuffer(wxOutputStream& o_stream)
+wxStreamBuffer::wxStreamBuffer(BufMode mode)
   : m_buffer_start(NULL), m_buffer_end(NULL), m_buffer_pos(NULL),
-    m_buffer_size(0), m_istream(NULL), m_ostream(&o_stream)
+    m_buffer_size(0), m_fixed(TRUE), m_flushable(FALSE), m_stream(NULL),
+    m_mode(mode), m_destroybuf(FALSE), m_destroystream(TRUE)
 {
+  m_stream = new wxStreamBase();
 }
 
-wxStreamBuffer::~wxStreamBuffer()
+wxStreamBuffer::wxStreamBuffer(const wxStreamBuffer& buffer)
 {
-  wxDELETEA(m_buffer_start);
+  m_buffer_start = buffer.m_buffer_start;
+  m_buffer_end = buffer.m_buffer_end;
+  m_buffer_pos = buffer.m_buffer_pos;
+  m_buffer_size = buffer.m_buffer_size;
+  m_fixed = buffer.m_fixed;
+  m_flushable = buffer.m_flushable;
+  m_stream = buffer.m_stream;
+  m_mode = buffer.m_mode;
+  m_destroybuf = FALSE;
+  m_destroystream = FALSE;
 }
 
-void wxStreamBuffer::WriteBack(char c)
+wxStreamBuffer::~wxStreamBuffer()
 {
-  if (m_ostream)
-    return;
-
-  // Assume that if we write "back" we have read a few bytes: so we have some
-  // space.
-  if (m_buffer_pos == m_buffer_start)
-    return;
-
-  m_buffer_pos--;
-  *m_buffer_pos = c;
+  if (m_destroybuf)
+    wxDELETEA(m_buffer_start);
+  if (m_destroystream)
+    delete m_stream;
 }
 
 void wxStreamBuffer::SetBufferIO(char *buffer_start, char *buffer_end)
 {
-  size_t ret;
-
+  if (m_destroybuf)
+    wxDELETEA(m_buffer_start);
   m_buffer_start = buffer_start;
   m_buffer_end   = buffer_end;
 
   m_buffer_size = m_buffer_end-m_buffer_start;
-
-  if (m_istream) {
-    ret = m_istream->DoRead(m_buffer_start, m_buffer_size);
-    m_buffer_end = m_buffer_start + ret;
-  }
-  m_buffer_pos = m_buffer_start;
+  m_destroybuf = FALSE;
+  ResetBuffer();
 }
 
 void wxStreamBuffer::SetBufferIO(size_t bufsize)
 {
   char *b_start;
 
-  wxDELETE(m_buffer_start);
+  if (m_destroybuf)
+    wxDELETEA(m_buffer_start);
 
   if (!bufsize) {
-    m_buffer_start = NULL;
-    m_buffer_end = NULL;
-    m_buffer_pos = NULL;
+    m_buffer_start = (char*)NULL;
+    m_buffer_end = (char*)NULL;
+    m_buffer_pos = (char*)NULL;
     m_buffer_size = 0;
     return;
   }
 
   b_start = new char[bufsize];
-
   SetBufferIO(b_start, b_start + bufsize);
+  m_destroybuf = TRUE;
 }
 
 void wxStreamBuffer::ResetBuffer()
 {
-  if (m_istream)
+  m_stream->m_lasterror = wxStream_NOERROR;
+  m_stream->m_lastcount = 0;
+  if (m_mode == read && m_flushable)
     m_buffer_pos = m_buffer_end;
   else
     m_buffer_pos = m_buffer_start;
 }
 
-void wxStreamBuffer::Read(void *buffer, size_t size)
+bool wxStreamBuffer::FillBuffer()
 {
-  wxASSERT(m_istream != NULL);
+  size_t count;
 
-  // ------------------
-  // Buffering disabled
-  // ------------------
+  count = m_stream->OnSysRead(m_buffer_start, m_buffer_size);
+  m_buffer_end = m_buffer_start+count;
+  m_buffer_pos = m_buffer_start;
+
+  if (count == 0)
+    return FALSE;
+  return TRUE;
+}
+
+bool wxStreamBuffer::FlushBuffer()
+{
+  size_t count, current;
+
+  if (m_buffer_pos == m_buffer_start || !m_flushable)
+    return FALSE;
+
+  current = m_buffer_pos-m_buffer_start;
+  count = m_stream->OnSysWrite(m_buffer_start, current);
+  if (count != current)
+    return FALSE;
+  m_buffer_pos = m_buffer_start;
+
+  return TRUE;
+}
+
+void wxStreamBuffer::GetFromBuffer(void *buffer, size_t size)
+{
+  size_t s_toget = m_buffer_end-m_buffer_pos;
+
+  if (size < s_toget)
+    s_toget = size;
+
+  memcpy(buffer, m_buffer_pos, s_toget);
+  m_buffer_pos += s_toget;
+}
+
+void wxStreamBuffer::PutToBuffer(const void *buffer, size_t size)
+{
+  size_t s_toput = m_buffer_end-m_buffer_pos;
+
+  if (s_toput < size && !m_fixed) {
+    if (!m_buffer_start)
+      SetBufferIO(size);
+    else {
+      size_t delta = m_buffer_pos-m_buffer_start;
+
+      m_buffer_start = (char *)realloc(m_buffer_start, m_buffer_size+size);
+      m_buffer_pos   = m_buffer_start + delta;
+      // I round a bit
+      m_buffer_size += size;
+      m_buffer_end   = m_buffer_start+m_buffer_size;
+    }
+    s_toput = size;
+  }
+  if (s_toput > size)
+    s_toput = size;
+  memcpy(m_buffer_pos, buffer, s_toput);
+  m_buffer_pos += s_toput;
+}
+
+void wxStreamBuffer::PutChar(char c)
+{
+  wxASSERT(m_stream != NULL);
 
   if (!m_buffer_size) {
-    m_istream->m_lastread = m_istream->DoRead(buffer, size);
+    m_stream->OnSysWrite(&c, 1);
+    return;
+  }
+
+  if (GetDataLeft() == 0 && !FlushBuffer()) {
+    CHECK_ERROR(wxStream_WRITE_ERR);
     return;
   }
 
+  PutToBuffer(&c, 1);
+  m_stream->m_lastcount = 1;
+}
+
+char wxStreamBuffer::Peek()
+{
+  char c;
+
+  wxASSERT(m_stream != NULL && m_buffer_size != 0);
+
+  if (!GetDataLeft()) {
+    CHECK_ERROR(wxStream_READ_ERR);
+    return 0;
+  }
+
+  GetFromBuffer(&c, 1);
+  m_buffer_pos--;
+
+  return c;
+}
+
+char wxStreamBuffer::GetChar()
+{
+  char c;
+
+  wxASSERT(m_stream != NULL);
+
+  if (!m_buffer_size) {
+    m_stream->OnSysRead(&c, 1);
+    return c;
+  }
+
+  if (!GetDataLeft()) {
+    CHECK_ERROR(wxStream_READ_ERR);
+    return 0;
+  }
+
+  GetFromBuffer(&c, 1);
+
+  m_stream->m_lastcount = 1;
+  return c;
+}
+
+size_t wxStreamBuffer::Read(void *buffer, size_t size)
+{
+  wxASSERT(m_stream != NULL);
+
+  if (m_mode == write)
+    return 0;
+
+  // ------------------
+  // Buffering disabled
+  // ------------------
+
+  m_stream->m_lasterror = wxStream_NOERROR;
+  if (!m_buffer_size)
+    return (m_stream->m_lastcount += m_stream->OnSysRead(buffer, size));
+
   // -----------------
   // Buffering enabled
   // -----------------
   size_t buf_left, orig_size = size;
-  size_t read_ret;
 
   while (size > 0) {
-    buf_left = m_buffer_end - m_buffer_pos; 
+    buf_left = GetDataLeft();
 
     // First case: the requested buffer is larger than the stream buffer,
-    //             we split
+    //             we split it.
     if (size > buf_left) {
-      memcpy(buffer, m_buffer_pos, buf_left);
-      size -= buf_left;
+      GetFromBuffer(buffer, buf_left);
+      size  -= buf_left;
       buffer = (char *)buffer + buf_left; // ANSI C++ violation.
 
-      read_ret = m_istream->DoRead(m_buffer_start, m_buffer_size);
-
-      // Read failed: EOF
-      if (read_ret == 0) {
-        m_istream->m_lastread = orig_size-size;
-        m_istream->m_eof = TRUE;
-        m_buffer_pos = m_buffer_end = m_buffer_start;
-        return;
-      } else {
-        m_buffer_end = m_buffer_start+read_ret;
-        m_buffer_pos = m_buffer_start;
+      if (!FillBuffer()) {
+        CHECK_ERROR(wxStream_EOF);
+        return (m_stream->m_lastcount = orig_size-size);
       }
     } else {
 
       // Second case: we just copy from the stream buffer.
-      memcpy(buffer, m_buffer_pos, size);
-      m_buffer_pos += size;
+      GetFromBuffer(buffer, size);
       break;
     }
   }
-  m_istream->m_lastread = orig_size;
+  return (m_stream->m_lastcount += orig_size);
+}
+
+size_t wxStreamBuffer::Read(wxStreamBuffer *s_buf)
+{
+  char buf[BUF_TEMP_SIZE];
+  size_t s = 0, bytes_read = BUF_TEMP_SIZE;
+
+  if (m_mode == write)
+    return 0;
+
+  while (bytes_read != 0) {
+    bytes_read = Read(buf, bytes_read);
+    bytes_read = s_buf->Write(buf, bytes_read);
+    s += bytes_read;
+  }
+  return s;
 }
 
-void wxStreamBuffer::Write(const void *buffer, size_t size)
+size_t wxStreamBuffer::Write(const void *buffer, size_t size)
 {
-  wxASSERT(m_ostream != NULL);
+  wxASSERT(m_stream != NULL);
+
+  if (m_mode == read)
+    return 0;
 
   // ------------------
   // Buffering disabled
   // ------------------
 
-  if (!m_buffer_size) {
-    m_ostream->m_lastwrite = m_ostream->DoWrite(buffer, size);
-    return;
-  }
+  m_stream->m_lasterror = wxStream_NOERROR;
+  if (!m_buffer_size && m_fixed)
+    return (m_stream->m_lastcount = m_stream->OnSysWrite(buffer, size));
 
   // ------------------
   // Buffering enabled
   // ------------------
 
   size_t buf_left, orig_size = size;
-  size_t write_ret;
 
   while (size > 0) {
     buf_left = m_buffer_end - m_buffer_pos;
 
     // First case: the buffer to write is larger than the stream buffer,
     //             we split it
-    if (size > buf_left) {
-      memcpy(m_buffer_pos, buffer, buf_left);
+    // NB: If stream buffer isn't fixed (as for wxMemoryOutputStream),
+    // we always go to the second case.
+    if (size > buf_left && m_fixed) {
+      PutToBuffer(buffer, buf_left);
       size -= buf_left;
       buffer = (char *)buffer + buf_left; // ANSI C++ violation.
 
-      write_ret = m_ostream->DoWrite(m_buffer_start, m_buffer_size);
-      if (write_ret != m_buffer_size) {
-        m_ostream->m_bad = TRUE;
-        m_ostream->m_lastwrite = orig_size-size;
-        m_buffer_pos = m_buffer_end = m_buffer_start;
-        return;
+      if (!FlushBuffer()) {
+	CHECK_ERROR(wxStream_WRITE_ERR);
+        return (m_stream->m_lastcount = orig_size-size);
       }
+
       m_buffer_pos = m_buffer_start;
 
     } else {
 
       // Second case: just copy it in the stream buffer.
-
-      memcpy(m_buffer_pos, buffer, size);
-      m_buffer_pos += size;
+      PutToBuffer(buffer, size);
       break;
     }
   }
-  m_ostream->m_lastwrite = orig_size;
+  return (m_stream->m_lastcount = orig_size);
 }
 
-// ----------------------------------------------------------------------------
-// wxInputStream
-// ----------------------------------------------------------------------------
-
-wxInputStream::wxInputStream()
+size_t wxStreamBuffer::Write(wxStreamBuffer *sbuf)
 {
-  m_i_destroybuf = TRUE;
-  m_i_streambuf = new wxStreamBuffer(*this);
-  m_eof = FALSE;
-  m_lastread = 0;
+  char buf[BUF_TEMP_SIZE];
+  size_t s = 0, bytes_count = BUF_TEMP_SIZE, b_count2;
+  wxInputStream *in_stream;
+
+  if (m_mode == read)
+    return 0;
+
+  in_stream = (wxInputStream *)sbuf->Stream();
+
+  while (bytes_count == BUF_TEMP_SIZE) {
+    b_count2 = sbuf->Read(buf, bytes_count);
+    bytes_count = Write(buf, b_count2);
+    if (b_count2 > bytes_count)
+      in_stream->Ungetch(buf+bytes_count, b_count2-bytes_count);
+    s += bytes_count;
+  }
+  return s;
 }
 
-wxInputStream::wxInputStream(wxStreamBuffer *buffer)
+off_t wxStreamBuffer::Seek(off_t pos, wxSeekMode mode)
 {
-  m_i_destroybuf = FALSE;
-  m_i_streambuf = buffer;
-  m_eof = FALSE;
-  m_lastread = 0;
+  off_t ret_off, diff, last_access;
+
+  last_access = GetLastAccess();
+
+  if (!m_flushable) {
+    switch (mode) {
+      case wxFromStart:   diff = pos;                     break;
+      case wxFromCurrent: diff = pos + GetIntPosition();  break;
+      case wxFromEnd:     diff = pos + last_access;       break;
+      default: return wxInvalidOffset;
+    }
+    if (diff < 0 || diff > last_access)
+      return wxInvalidOffset;
+    SetIntPosition(diff);
+    return diff;
+  }
+
+  switch (mode) {
+  case wxFromStart: {
+    // We'll try to compute an internal position later ...
+    ret_off = m_stream->OnSysSeek(pos, wxFromStart);
+    ResetBuffer();
+    return ret_off;
+  }
+  case wxFromCurrent: {
+    diff = pos + GetIntPosition();
+
+    if ( (diff > last_access) || (diff < 0) ) {
+      // We must take into account the fact that we have read something
+      // previously.
+      ret_off = m_stream->OnSysSeek(diff-last_access, wxFromCurrent);
+      ResetBuffer();
+      return ret_off;
+    } else {
+      SetIntPosition(diff);
+      return pos;
+    }
+  }
+  case wxFromEnd:
+    // Hard to compute: always seek to the requested position.
+    ret_off = m_stream->OnSysSeek(pos, wxFromEnd);
+    ResetBuffer();
+    return ret_off;
+  }
+  return wxInvalidOffset;
 }
 
-wxInputStream::~wxInputStream()
+off_t wxStreamBuffer::Tell() const
 {
-  if (m_i_destroybuf)
-    delete m_i_streambuf;
+    off_t pos = m_stream->OnSysTell();
+    if (pos == wxInvalidOffset)
+        return wxInvalidOffset;
+
+    pos += GetIntPosition();
+
+    if (m_mode == read && m_flushable)
+        pos -= GetLastAccess();
+
+    return pos;
 }
 
-char wxInputStream::GetC()
+size_t wxStreamBuffer::GetDataLeft()
 {
-  char c;
-  m_i_streambuf->Read(&c, 1);
-  return c;
+    /* Why is this done? RR. */
+    if (m_buffer_end == m_buffer_pos && m_flushable)
+        FillBuffer();
+
+    return m_buffer_end-m_buffer_pos;
 }
 
-wxInputStream& wxInputStream::Read(void *buffer, size_t size)
+// ----------------------------------------------------------------------------
+// wxStreamBase
+// ----------------------------------------------------------------------------
+
+wxStreamBase::wxStreamBase()
 {
-  m_i_streambuf->Read(buffer, size);
-  // wxStreamBuffer sets all variables for us
-  return *this;
+    m_lasterror = wxStream_NOERROR;
+    m_lastcount = 0;
 }
 
-#define BUF_TEMP_SIZE 10000
+wxStreamBase::~wxStreamBase()
+{
+}
 
-wxInputStream& wxInputStream::Read(wxOutputStream& stream_out)
+size_t wxStreamBase::OnSysRead(void *WXUNUSED(buffer), size_t WXUNUSED(size))
 {
-  char buf[BUF_TEMP_SIZE]; 
-  size_t bytes_read = BUF_TEMP_SIZE;
+    return 0;
+}
 
-  while (bytes_read == BUF_TEMP_SIZE && !stream_out.Bad()) {
-    bytes_read = Read(buf, bytes_read).LastRead();
+size_t wxStreamBase::OnSysWrite(const void *WXUNUSED(buffer), size_t WXUNUSED(bufsize))
+{
+    return 0;
+}
 
-    stream_out.Write(buf, bytes_read);
-  }
-  return *this;
+off_t wxStreamBase::OnSysSeek(off_t WXUNUSED(seek), wxSeekMode WXUNUSED(mode))
+{
+    return wxInvalidOffset;
 }
 
-wxInputStream& wxInputStream::operator>>(wxString& line)
+off_t wxStreamBase::OnSysTell() const
 {
-  wxDataInputStream s(*this);
+    return wxInvalidOffset;
+}
 
-  line = s.ReadLine();
-  return *this;
+// ----------------------------------------------------------------------------
+// wxInputStream
+// ----------------------------------------------------------------------------
+
+wxInputStream::wxInputStream()
+  : wxStreamBase(),
+    m_wback(NULL), m_wbacksize(0), m_wbackcur(0)
+{
 }
 
-wxInputStream& wxInputStream::operator>>(char& c)
+wxInputStream::~wxInputStream()
 {
-  c = GetC();
-  return *this;
+  if (m_wback)
+    free(m_wback);
 }
 
-wxInputStream& wxInputStream::operator>>(short& i)
+bool wxInputStream::Eof() const
 {
-  long l;
+    wxInputStream *self = (wxInputStream *)this;    // const_cast
+
+    char c;
+    self->Read(&c, 1);
+    if ( GetLastError() == wxSTREAM_EOF )
+    {
+        return TRUE;
+    }
+
+    self->Ungetch(c);
 
-  *this >> l;
-  i = (short)l;
-  return *this;
+    return FALSE;
 }
 
-wxInputStream& wxInputStream::operator>>(int& i)
+char *wxInputStream::AllocSpaceWBack(size_t needed_size)
 {
-  long l;
+    /* get number of bytes left from previous wback buffer */
+    size_t toget = m_wbacksize - m_wbackcur;
+
+    /* allocate a buffer large enough to hold prev + new data */
+    char *temp_b = (char *) malloc(needed_size + toget);
+
+    if (!temp_b)
+        return NULL;
+
+    /* copy previous data (and free old buffer) if needed */
+    if (m_wback)
+    {
+        memmove(temp_b + needed_size, m_wback + m_wbackcur, toget);
+        free(m_wback);
+    }
+
+    /* done */
+    m_wback = temp_b;
+    m_wbackcur = 0;
+    m_wbacksize = needed_size + toget;
 
-  *this >> l;
-  i = (short)l;
-  return *this;
+    return (char *) m_wback;
 }
 
-wxInputStream& wxInputStream::operator>>(long& i)
+size_t wxInputStream::GetWBack(char *buf, size_t bsize)
 {
-  /* I only implemented a simple integer parser */
-  int c, sign;
+    size_t s_toget = m_wbacksize-m_wbackcur;
 
-  while (isspace( c = GetC() ) )
-     /* Do nothing */ ;
+    if (!m_wback)
+        return 0;
 
-  i = 0;
-  if (! (c == '-' || isdigit(c)) ) {
-    InputStreamBuffer()->WriteBack(c);
-    return *this;
-  }
+    if (bsize < s_toget)
+       s_toget = bsize;
 
-  if (c == '-') {
-    sign = -1;
-    c = GetC();
-  } else
-    sign = 1;
+    memcpy(buf, (m_wback+m_wbackcur), s_toget);
 
-  while (isdigit(c)) {
-    i = i*10 + c;
-    c = GetC();
-  }
-
-  i *= sign;
+    m_wbackcur += s_toget;
+    if (m_wbackcur == m_wbacksize)
+    {
+        free(m_wback);
+        m_wback = (char *)NULL;
+        m_wbacksize = 0;
+        m_wbackcur = 0;
+    }
 
-  return *this;
+    return s_toget;
 }
 
-wxInputStream& wxInputStream::operator>>(float& f)
+size_t wxInputStream::Ungetch(const void *buf, size_t bufsize)
 {
-  /* I only implemented a simple float parser */
-  int c, sign;
+    char *ptrback = AllocSpaceWBack(bufsize);
+    if (!ptrback)
+        return 0;
 
-  while (isspace( c = GetC() ) )
-     /* Do nothing */ ;
+    memcpy(ptrback, buf, bufsize);
+    return bufsize;
+}
 
-  f = 0.0;
-  if (! (c == '-' || isdigit(c)) ) {
-    InputStreamBuffer()->WriteBack(c);
-    return *this;
-  }
+bool wxInputStream::Ungetch(char c)
+{
+    char * ptrback = AllocSpaceWBack(1);
+    if (!ptrback)
+        return FALSE;
 
-  if (c == '-') {
-    sign = -1;
-    c = GetC();
-  } else
-    sign = 1;
+    *ptrback = c;
+    return TRUE;
+}
 
-  while (isdigit(c)) {
-    f = f*10 + c;
-    c = GetC();
-  }
+char wxInputStream::GetC()
+{
+    char c;
+    Read(&c, 1);
+    return c;
+}
 
-  if (c == '.') {
-    float f_multiplicator = 0.1;
-    c = GetC();
+wxInputStream& wxInputStream::Read(void *buffer, size_t size)
+{
+    char *buf = (char *)buffer;
 
-    while (isdigit(c)) {
-      f += c*f_multiplicator;
-      f_multiplicator /= 10;
-      c = GetC();
+    size_t retsize = GetWBack(buf, size);
+    if (retsize == size)
+    {
+        m_lastcount = size;
+        m_lasterror = wxStream_NOERROR;
+        return *this;
     }
-  }
-
-  f *= sign;
+    size -= retsize;
+    buf  += retsize;
 
-  return *this;
+    m_lastcount = OnSysRead(buf, size) + retsize;
+    return *this;
 }
 
-#if USE_SERIAL
-wxInputStream& wxInputStream::operator>>(wxObject *& obj)
+char wxInputStream::Peek()
 {
-  wxObjectInputStream obj_s(*this);
-  obj = obj_s.LoadObject();
-  return *this;
+    char c;
+    Read(&c, 1);
+    if (m_lasterror == wxStream_NOERROR)
+    {
+        Ungetch(c);
+        return c;
+    }
+
+    return 0;
 }
-#endif
 
-off_t wxInputStream::SeekI(off_t pos, wxSeekMode mode)
+wxInputStream& wxInputStream::Read(wxOutputStream& stream_out)
 {
-  off_t ret_off, diff, last_access;
-
-  last_access = m_i_streambuf->GetLastAccess();
+    char buf[BUF_TEMP_SIZE];
+    size_t bytes_read = BUF_TEMP_SIZE;
 
-  switch (mode) {
-  case wxFromStart:
-    diff = DoTellInput() - pos;
-    if ( diff < 0 || diff > last_access  ) {
-      ret_off = DoSeekInput(pos, wxFromStart);
-      m_i_streambuf->ResetBuffer();
-      return ret_off;
-    } else {
-      m_i_streambuf->SetIntPosition(last_access - diff);
-      return pos;
+    while (bytes_read == BUF_TEMP_SIZE)
+    {
+        bytes_read = Read(buf, bytes_read).LastRead();
+        bytes_read = stream_out.Write(buf, bytes_read).LastWrite();
     }
-  case wxFromCurrent:
-    diff = pos + m_i_streambuf->GetIntPosition();
+    return *this;
+}
 
-    if ( (diff > last_access) || (diff < 0) ) {
-      ret_off = DoSeekInput(pos, wxFromCurrent);
-      m_i_streambuf->ResetBuffer();
-      return ret_off;
-    } else {
-      m_i_streambuf->SetIntPosition(diff);
-      return pos;
+off_t wxInputStream::SeekI(off_t pos, wxSeekMode mode)
+{
+    /* Should be check and improve, just to remove a slight bug !
+       I don't know whether it should be put as well in wxFileInputStream::OnSysSeek ? */
+    if (m_lasterror==wxSTREAM_EOF)
+        m_lasterror=wxSTREAM_NOERROR;
+
+    /* A call to SeekI() will automatically invalidate any previous call
+       to Ungetch(), otherwise it would be possible to SeekI() to one
+       one position, unread some bytes there, SeekI() to another position
+       and the data would be corrupted.
+
+       GRG: Could add code here to try to navigate within the wback
+       buffer if possible, but is it really needed? It would only work
+       when seeking in wxFromCurrent mode, else it would invalidate
+       anyway...
+     */
+    if (m_wback)
+    {
+        free(m_wback);
+        m_wback = (char*) NULL;
+        m_wbacksize = 0;
+        m_wbackcur = 0;
     }
-  case wxFromEnd:
-    // Hard to compute: always seek to the requested position.
-    ret_off = DoSeekInput(pos, wxFromEnd);
-    m_i_streambuf->ResetBuffer();
-    return ret_off;
-  }
-  return wxInvalidOffset;
+
+    return OnSysSeek(pos, mode);
 }
 
 off_t wxInputStream::TellI() const
 {
-  return DoTellInput() - m_i_streambuf->GetLastAccess() +
-                         m_i_streambuf->GetIntPosition();
+    /* GRG: Changed to make it compatible with the wback buffer */
+    off_t pos = OnSysTell();
+
+    if (pos != wxInvalidOffset)
+        pos -= (m_wbacksize - m_wbackcur);
+
+    return pos;
 }
 
+// --------------------
+// Overloaded operators
+// --------------------
+
+#if wxUSE_SERIAL
+wxInputStream& wxInputStream::operator>>(wxObject *& obj)
+{
+    wxObjectInputStream obj_s(*this);
+    obj = obj_s.LoadObject();
+    return *this;
+}
+#endif
+
+
 // ----------------------------------------------------------------------------
 // wxOutputStream
 // ----------------------------------------------------------------------------
 wxOutputStream::wxOutputStream()
+  : wxStreamBase()
 {
-  m_o_destroybuf = TRUE;
-  m_o_streambuf = new wxStreamBuffer(*this);
-  m_bad = FALSE;
-  m_lastwrite = 0;
 }
 
-wxOutputStream::wxOutputStream(wxStreamBuffer *buffer)
+wxOutputStream::~wxOutputStream()
 {
-  m_o_destroybuf = FALSE;
-  m_o_streambuf = buffer;
-  m_bad = FALSE;
-  m_lastwrite = 0;
 }
 
-wxOutputStream::~wxOutputStream()
+void wxOutputStream::PutC(char c)
 {
-  if (m_o_destroybuf)
-    delete m_o_streambuf;
+    Write((void *) &c, 1);
 }
 
 wxOutputStream& wxOutputStream::Write(const void *buffer, size_t size)
 {
-  m_o_streambuf->Write(buffer, size);
-  return *this;
+    m_lastcount = OnSysWrite(buffer, size);
+    return *this;
 }
 
 wxOutputStream& wxOutputStream::Write(wxInputStream& stream_in)
 {
-  stream_in.Read(*this);
-  return *this;
+    stream_in.Read(*this);
+    return *this;
 }
 
-off_t wxOutputStream::SeekO(off_t pos, wxSeekMode mode)
+off_t wxOutputStream::TellO() const
 {
-  off_t ret_off;
-
-  switch (mode) {
-  case wxFromStart:
-    if ( (unsigned)abs (DoTellOutput()-pos) > m_o_streambuf->GetLastAccess()  ) {
-      ret_off = DoSeekOutput(pos, wxFromStart);
-      m_o_streambuf->ResetBuffer();
-      return ret_off;
-    } else {
-      m_o_streambuf->SetIntPosition( DoTellOutput() - pos);
-      return pos;
-    }
-  case wxFromCurrent:
-    if ( ((unsigned)pos > m_o_streambuf->GetLastAccess()) || (pos < 0) ) {
-      ret_off = DoSeekOutput(pos, wxFromCurrent);
-      m_o_streambuf->ResetBuffer();
-      return ret_off;
-    } else {
-      m_o_streambuf->SetIntPosition(pos);
-      return pos;
-    }
-  case wxFromEnd:
-    // Hard to compute: always seek to the requested position.
-    ret_off = DoSeekOutput(pos, wxFromEnd);
-    m_o_streambuf->ResetBuffer();
-    return ret_off;
-  }
-  return wxInvalidOffset;
+    return OnSysTell();
 }
 
-off_t wxOutputStream::TellO() const
+off_t wxOutputStream::SeekO(off_t pos, wxSeekMode mode)
 {
-  return DoTellOutput() - m_o_streambuf->GetLastAccess()
-                        + m_o_streambuf->GetIntPosition();
+    return OnSysSeek(pos, mode);
 }
 
 void wxOutputStream::Sync()
 {
-  DoWrite(m_o_streambuf->GetBufferStart(), m_o_streambuf->GetIntPosition());
+}
 
-  m_o_streambuf->ResetBuffer();
+#if wxUSE_SERIAL
+wxOutputStream& wxOutputStream::operator<<(wxObject& obj)
+{
+    wxObjectOutputStream obj_s(*this);
+    obj_s.SaveObject(obj);
+    return *this;
 }
+#endif
 
-wxOutputStream& wxOutputStream::operator<<(const char *string)
+// ----------------------------------------------------------------------------
+// wxCountingOutputStream
+// ----------------------------------------------------------------------------
+
+wxCountingOutputStream::wxCountingOutputStream ()
+  : wxOutputStream()
 {
-  return Write(string, strlen(string));
+     m_currentPos = 0;
 }
 
-wxOutputStream& wxOutputStream::operator<<(wxString& string)
+size_t wxCountingOutputStream::GetSize() const
 {
-  return Write(string, string.Len());
+    return m_lastcount;
 }
 
-wxOutputStream& wxOutputStream::operator<<(char c)
+size_t wxCountingOutputStream::OnSysWrite(const void *WXUNUSED(buffer), size_t size)
 {
-  return Write(&c, 1);
+    m_currentPos += size;
+    if (m_currentPos > m_lastcount) m_lastcount = m_currentPos;
+    return m_currentPos;
 }
 
-wxOutputStream& wxOutputStream::operator<<(short i)
+off_t wxCountingOutputStream::OnSysSeek(off_t pos, wxSeekMode mode)
 {
-  wxString strint;
+    if (mode == wxFromStart)
+        m_currentPos = pos;
+    if (mode == wxFromEnd)
+        m_currentPos = m_lastcount + pos;
+    else
+        m_currentPos += pos;
+
+    if (m_currentPos > m_lastcount) m_lastcount = m_currentPos;
 
-  strint.Printf("%i", i);
-  return Write(strint, strint.Len());
+    return m_currentPos;
 }
 
-wxOutputStream& wxOutputStream::operator<<(int i)
+off_t wxCountingOutputStream::OnSysTell() const
 {
-  wxString strint;
+    return m_currentPos;
+}
+
+// ----------------------------------------------------------------------------
+// wxFilterInputStream
+// ----------------------------------------------------------------------------
 
-  strint.Printf("%i", i);
-  return Write(strint, strint.Len());
+wxFilterInputStream::wxFilterInputStream()
+  : wxInputStream()
+{
 }
 
-wxOutputStream& wxOutputStream::operator<<(long i)
+wxFilterInputStream::wxFilterInputStream(wxInputStream& stream)
+  : wxInputStream()
 {
-  wxString strlong;
+    m_parent_i_stream = &stream;
+}
 
-  strlong.Printf("%i", i);
-  return Write((const char *)strlong, strlong.Len());
+wxFilterInputStream::~wxFilterInputStream()
+{
 }
 
-wxOutputStream& wxOutputStream::operator<<(double f)
+// ----------------------------------------------------------------------------
+// wxFilterOutputStream
+// ----------------------------------------------------------------------------
+wxFilterOutputStream::wxFilterOutputStream()
+  : wxOutputStream()
 {
-  wxString strfloat;
+}
 
-  strfloat.Printf("%f", f);
-  return Write(strfloat, strfloat.Len());
+wxFilterOutputStream::wxFilterOutputStream(wxOutputStream& stream)
+  : wxOutputStream()
+{
+    m_parent_o_stream = &stream;
 }
 
-#if USE_SERIAL
-wxOutputStream& wxOutputStream::operator<<(wxObject& obj)
+wxFilterOutputStream::~wxFilterOutputStream()
 {
-  wxObjectOutputStream obj_s(*this);
-  obj_s.SaveObject(obj);
-  return *this;
 }
-#endif
 
 // ----------------------------------------------------------------------------
-// wxStream
+// wxBufferedInputStream
 // ----------------------------------------------------------------------------
+wxBufferedInputStream::wxBufferedInputStream(wxInputStream& s)
+  : wxFilterInputStream(s)
+{
+    m_i_streambuf = new wxStreamBuffer(*this, wxStreamBuffer::read);
+    m_i_streambuf->SetBufferIO(1024);
+}
 
-wxStream::wxStream()
-  : wxInputStream(), wxOutputStream()
+wxBufferedInputStream::~wxBufferedInputStream()
 {
+    off_t unused_bytes=m_i_streambuf->GetBufferPos()-m_i_streambuf->GetBufferEnd();
+    m_parent_i_stream->SeekI(unused_bytes,wxFromCurrent);
+
+    delete m_i_streambuf;
 }
 
-// ----------------------------------------------------------------------------
-// wxFilterInputStream
-// ----------------------------------------------------------------------------
-wxFilterInputStream::wxFilterInputStream()
-  : wxInputStream(NULL)
+char wxBufferedInputStream::Peek()
 {
+    return m_i_streambuf->Peek();
 }
 
-wxFilterInputStream::wxFilterInputStream(wxInputStream& stream)
-  : wxInputStream(NULL)
+wxInputStream& wxBufferedInputStream::Read(void *buffer, size_t size)
+{
+    size_t retsize;
+    char *buf = (char *)buffer;
+
+    retsize = GetWBack(buf, size);
+    m_lastcount = retsize;
+    if (retsize == size)
+    {
+        m_lasterror = wxStream_NOERROR;
+        return *this;
+    }
+    size -= retsize;
+    buf  += retsize;
+
+    m_i_streambuf->Read(buf, size);
+
+    return *this;
+}
+
+off_t wxBufferedInputStream::SeekI(off_t pos, wxSeekMode mode)
 {
-  m_parent_i_stream = &stream;
-  m_i_streambuf = stream.InputStreamBuffer();
+    return m_i_streambuf->Seek(pos, mode);
 }
 
-wxFilterInputStream::~wxFilterInputStream()
+off_t wxBufferedInputStream::TellI() const
 {
+    return m_i_streambuf->Tell();
 }
 
-size_t wxFilterInputStream::DoRead(void *buffer, size_t size)
+size_t wxBufferedInputStream::OnSysRead(void *buffer, size_t bufsize)
 {
-  return m_parent_i_stream->Read(buffer, size).LastRead();
+    return m_parent_i_stream->Read(buffer, bufsize).LastRead();
 }
 
-off_t wxFilterInputStream::DoSeekInput(off_t pos, wxSeekMode mode)
+off_t wxBufferedInputStream::OnSysSeek(off_t seek, wxSeekMode mode)
 {
-  return m_parent_i_stream->SeekI(pos, mode);
+    return m_parent_i_stream->SeekI(seek, mode);
 }
 
-off_t wxFilterInputStream::DoTellInput() const
+off_t wxBufferedInputStream::OnSysTell() const
 {
-  return m_parent_i_stream->TellI();
+    return m_parent_i_stream->TellI();
 }
 
+
 // ----------------------------------------------------------------------------
-// wxFilterOutputStream
+// wxBufferedOutputStream
 // ----------------------------------------------------------------------------
-wxFilterOutputStream::wxFilterOutputStream()
-  : wxOutputStream(NULL)
+
+wxBufferedOutputStream::wxBufferedOutputStream(wxOutputStream& s)
+  : wxFilterOutputStream(s)
 {
+    m_o_streambuf = new wxStreamBuffer(*this, wxStreamBuffer::write);
+    m_o_streambuf->SetBufferIO(1024);
 }
 
-wxFilterOutputStream::wxFilterOutputStream(wxOutputStream& stream)
-  : wxOutputStream(NULL)
+wxBufferedOutputStream::~wxBufferedOutputStream()
 {
-  m_parent_o_stream = &stream;
-  m_o_streambuf = stream.OutputStreamBuffer();
+    Sync();
+    delete m_o_streambuf;
 }
 
-wxFilterOutputStream::~wxFilterOutputStream()
+wxOutputStream& wxBufferedOutputStream::Write(const void *buffer, size_t size)
 {
+    m_lastcount = 0;
+    m_o_streambuf->Write(buffer, size);
+    return *this;
 }
 
-size_t wxFilterOutputStream::DoWrite(const void *buffer, size_t size)
+off_t wxBufferedOutputStream::SeekO(off_t pos, wxSeekMode mode)
 {
-  return m_parent_o_stream->Write(buffer, size).LastWrite();
+    Sync();
+    return m_o_streambuf->Seek(pos, mode);
 }
 
-off_t wxFilterOutputStream::DoSeekOutput(off_t pos, wxSeekMode mode)
+off_t wxBufferedOutputStream::TellO() const
 {
-  return m_parent_o_stream->SeekO(pos, mode);
+    return m_o_streambuf->Tell();
 }
 
-off_t wxFilterOutputStream::DoTellOutput() const
+void wxBufferedOutputStream::Sync()
 {
-  return m_parent_o_stream->TellO();
+    m_o_streambuf->FlushBuffer();
+    m_parent_o_stream->Sync();
 }
 
-// ----------------------------------------------------------------------------
-// wxFilterStream
-// ----------------------------------------------------------------------------
+size_t wxBufferedOutputStream::OnSysWrite(const void *buffer, size_t bufsize)
+{
+    return m_parent_o_stream->Write(buffer, bufsize).LastWrite();
+}
+
+off_t wxBufferedOutputStream::OnSysSeek(off_t seek, wxSeekMode mode)
+{
+    return m_parent_o_stream->SeekO(seek, mode);
+}
 
-wxFilterStream::wxFilterStream()
+off_t wxBufferedOutputStream::OnSysTell() const
 {
+    return m_parent_o_stream->TellO();
 }
 
-wxFilterStream::wxFilterStream(wxStream& stream)
-  : wxFilterInputStream(stream), wxFilterOutputStream(stream)
+size_t wxBufferedOutputStream::GetSize() const
 {
+   return m_parent_o_stream->GetSize() + m_o_streambuf->GetIntPosition();
 }
 
 // ----------------------------------------------------------------------------
@@ -651,7 +952,14 @@ wxOutputStream& wxEndL(wxOutputStream& stream)
 {
 #ifdef __MSW__
   return stream.Write("\r\n", 2);
+#else
+#ifdef __WXMAC__
+  return stream.Write("\r", 1);
 #else
   return stream.Write("\n", 1);
 #endif
+#endif
 }
+
+#endif
+  // wxUSE_STREAMS