X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/9b11cb6e3fd432093b82b0fba6f9448adde50624..4b5d2be39657bb364c9111c4d13b1eecb8f3b69f:/src/common/stream.cpp

diff --git a/src/common/stream.cpp b/src/common/stream.cpp
index 26d3ab77cd..d26e307163 100644
--- a/src/common/stream.cpp
+++ b/src/common/stream.cpp
@@ -7,7 +7,7 @@
 // Created:     11/07/98
 // RCS-ID:      $Id$
 // Copyright:   (c) Guilhem Lavaux
-// Licence:     wxWindows license
+// Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
 // ============================================================================
@@ -18,35 +18,31 @@
 // headers
 // ----------------------------------------------------------------------------
 
-#ifdef __GNUG__
-    #pragma implementation "stream.h"
-#endif
-
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
 #ifdef __BORLANDC__
-  #pragma hdrstop
+    #pragma hdrstop
 #endif
 
+#if wxUSE_STREAMS
+
+#include "wx/stream.h"
+
 #ifndef WX_PRECOMP
-  #include "wx/defs.h"
+    #include "wx/log.h"
 #endif
 
-#if wxUSE_STREAMS
-
 #include <ctype.h>
-#include "wx/stream.h"
 #include "wx/datstrm.h"
 #include "wx/textfile.h"
-#include "wx/log.h"
 
 // ----------------------------------------------------------------------------
 // constants
 // ----------------------------------------------------------------------------
 
 // the temporary buffer size used when copying from stream to stream
-#define BUF_TEMP_SIZE 10000
+#define BUF_TEMP_SIZE 4096
 
 // ============================================================================
 // implementation
@@ -58,7 +54,7 @@
 
 void wxStreamBuffer::SetError(wxStreamError err)
 {
-   if ( m_stream->m_lasterror == wxStream_NOERROR )
+   if ( m_stream && m_stream->m_lasterror == wxSTREAM_NO_ERROR )
        m_stream->m_lasterror = err;
 }
 
@@ -67,79 +63,67 @@ void wxStreamBuffer::InitBuffer()
     m_buffer_start =
     m_buffer_end =
     m_buffer_pos = NULL;
-    m_buffer_size = 0;
 
     // if we are going to allocate the buffer, we should free it later as well
-    m_destroybuf = TRUE;
+    m_destroybuf = true;
 }
 
 void wxStreamBuffer::Init()
 {
     InitBuffer();
 
-    m_fixed = TRUE;
+    m_fixed = true;
 }
 
-wxStreamBuffer::wxStreamBuffer(wxStreamBase& stream, BufMode mode)
+wxStreamBuffer::wxStreamBuffer(BufMode mode)
 {
     Init();
 
-    m_stream = &stream;
+    m_stream = NULL;
     m_mode = mode;
 
-    m_flushable = TRUE;
-    m_destroystream = FALSE;
+    m_flushable = false;
 }
 
-wxStreamBuffer::wxStreamBuffer(BufMode mode)
+wxStreamBuffer::wxStreamBuffer(wxStreamBase& stream, BufMode mode)
 {
     Init();
 
-    wxASSERT_MSG(mode != read_write, wxT("you have to use the other ctor for read_write mode") );
-    if ( mode == read )
-        m_stream = new wxInputStream;
-    else if ( mode == write)
-        m_stream = new wxOutputStream;
-    else
-        m_stream = NULL;
-
+    m_stream = &stream;
     m_mode = mode;
 
-    m_flushable = FALSE;
-    m_destroystream = TRUE;
+    m_flushable = true;
 }
 
 wxStreamBuffer::wxStreamBuffer(const wxStreamBuffer& buffer)
 {
-    // doing this has big chances to lead to a crashwhen the source buffer is
+    // doing this has big chances to lead to a crash when the source buffer is
     // destroyed (otherwise assume the caller knows what he does)
-    wxASSERT_MSG( !buffer.m_destroybuf && !buffer.m_destroystream,
+    wxASSERT_MSG( !buffer.m_destroybuf,
                   _T("it's a bad idea to copy this buffer") );
 
     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;
+    m_destroybuf = false;
 }
 
 void wxStreamBuffer::FreeBuffer()
 {
     if ( m_destroybuf )
+    {
         free(m_buffer_start);
+        m_buffer_start = NULL;
+    }
 }
 
 wxStreamBuffer::~wxStreamBuffer()
 {
     FreeBuffer();
-
-    if ( m_destroystream )
-        delete m_stream;
 }
 
 wxInputStream *wxStreamBuffer::GetInputStream() const
@@ -170,8 +154,6 @@ void wxStreamBuffer::SetBufferIO(void *start,
     m_buffer_start = (char *)start;
     m_buffer_end   = m_buffer_start + len;
 
-    m_buffer_size = len;
-
     // if we own it, we free it
     m_destroybuf = takeOwnership;
 
@@ -180,29 +162,51 @@ void wxStreamBuffer::SetBufferIO(void *start,
 
 void wxStreamBuffer::SetBufferIO(size_t bufsize)
 {
-    // start by freeing the old buffer
-    FreeBuffer();
-
     if ( bufsize )
     {
-        SetBufferIO(malloc(bufsize), bufsize, TRUE /* take ownership */);
+        // this will free the old buffer and allocate the new one
+        SetBufferIO(malloc(bufsize), bufsize, true /* take ownership */);
     }
     else // no buffer size => no buffer
     {
+        // still free the old one
+        FreeBuffer();
         InitBuffer();
     }
 }
 
 void wxStreamBuffer::ResetBuffer()
 {
-    wxCHECK_RET( m_stream, _T("should have a stream in wxStreamBuffer") );
+    if ( m_stream )
+    {
+        m_stream->Reset();
+        m_stream->m_lastcount = 0;
+    }
 
-    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;
+    m_buffer_pos = m_mode == read && m_flushable
+                        ? m_buffer_end
+                        : m_buffer_start;
+}
+
+void wxStreamBuffer::Truncate()
+{
+    size_t new_size = m_buffer_pos - m_buffer_start;
+    if ( m_buffer_pos == m_buffer_end )
+        return;
+
+    if ( !new_size )
+    {
+        FreeBuffer();
+        InitBuffer();
+        return;
+    }
+
+    char *new_start = (char *)realloc(m_buffer_start, new_size);
+    wxCHECK_RET( new_size, _T("shrinking buffer shouldn't fail") );
+
+    m_buffer_start = new_start;
+    m_buffer_end = m_buffer_start + new_size;
+    m_buffer_pos = m_buffer_end;
 }
 
 // fill the buffer with as much data as possible (only for read buffers)
@@ -210,39 +214,41 @@ bool wxStreamBuffer::FillBuffer()
 {
     wxInputStream *inStream = GetInputStream();
 
-    wxCHECK_MSG( inStream, FALSE, _T("should have a stream in wxStreamBuffer") );
+    // It's legal to have no stream, so we don't complain about it just return false
+    if ( !inStream )
+        return false;
 
-    size_t count = inStream->OnSysRead(m_buffer_start, m_buffer_size);
+    size_t count = inStream->OnSysRead(GetBufferStart(), GetBufferSize());
     if ( !count )
-        return FALSE;
+        return false;
 
     m_buffer_end = m_buffer_start + count;
     m_buffer_pos = m_buffer_start;
 
-    return TRUE;
+    return true;
 }
 
 // write the buffer contents to the stream (only for write buffers)
 bool wxStreamBuffer::FlushBuffer()
 {
-    wxCHECK_MSG( m_flushable, FALSE, _T("can't flush this buffer") );
+    wxCHECK_MSG( m_flushable, false, _T("can't flush this buffer") );
 
     // FIXME: what is this check for? (VZ)
     if ( m_buffer_pos == m_buffer_start )
-        return FALSE;
+        return false;
 
     wxOutputStream *outStream = GetOutputStream();
 
-    wxCHECK_MSG( outStream, FALSE, _T("should have a stream in wxStreamBuffer") );
+    wxCHECK_MSG( outStream, false, _T("should have a stream in wxStreamBuffer") );
 
     size_t current = m_buffer_pos - m_buffer_start;
     size_t count = outStream->OnSysWrite(m_buffer_start, current);
     if ( count != current )
-        return FALSE;
+        return false;
 
     m_buffer_pos = m_buffer_start;
 
-    return TRUE;
+    return true;
 }
 
 size_t wxStreamBuffer::GetDataLeft()
@@ -271,6 +277,7 @@ void wxStreamBuffer::GetFromBuffer(void *buffer, size_t size)
 void wxStreamBuffer::PutToBuffer(const void *buffer, size_t size)
 {
     size_t left = GetBytesLeft();
+
     if ( size > left )
     {
         if ( m_fixed )
@@ -281,24 +288,26 @@ void wxStreamBuffer::PutToBuffer(const void *buffer, size_t size)
         else // !m_fixed
         {
             // realloc the buffer to have enough space for the data
-            size_t delta = m_buffer_pos - m_buffer_start;
-
-            char *startOld = m_buffer_start;
-            m_buffer_size += size;
-            m_buffer_start = (char *)realloc(m_buffer_start, m_buffer_size);
-            if ( !m_buffer_start )
+            if ( m_buffer_pos + size > m_buffer_end )
             {
-                // don't leak memory if realloc() failed
-                m_buffer_start = startOld;
-                m_buffer_size -= size;
+                size_t delta = m_buffer_pos - m_buffer_start;
+                size_t new_size = delta + size;
 
-                // what else can we do?
-                return;
-            }
+                char *startOld = m_buffer_start;
+                m_buffer_start = (char *)realloc(m_buffer_start, new_size);
+                if ( !m_buffer_start )
+                {
+                    // don't leak memory if realloc() failed
+                    m_buffer_start = startOld;
+
+                    // what else can we do?
+                    return;
+                }
 
-            // adjust the pointers invalidated by realloc()
-            m_buffer_pos = m_buffer_start + delta;
-            m_buffer_end = m_buffer_start + m_buffer_size;
+                // adjust the pointers invalidated by realloc()
+                m_buffer_pos = m_buffer_start + delta;
+                m_buffer_end = m_buffer_start + new_size;
+            } // else: the buffer is big enough
         }
     }
 
@@ -315,7 +324,7 @@ void wxStreamBuffer::PutChar(char c)
     // if we don't have buffer at all, just forward this call to the stream,
     if ( !HasBuffer() )
     {
-        outStream->OnSysWrite(&c, 1);
+        outStream->OnSysWrite(&c, sizeof(c));
     }
     else
     {
@@ -323,11 +332,11 @@ void wxStreamBuffer::PutChar(char c)
         if ( !GetDataLeft() && !FlushBuffer() )
         {
             // we don't
-            SetError(wxStream_WRITE_ERR);
+            SetError(wxSTREAM_WRITE_ERROR);
         }
         else
         {
-            PutToBuffer(&c, 1);
+            PutToBuffer(&c, sizeof(c));
             m_stream->m_lastcount = 1;
         }
     }
@@ -340,12 +349,12 @@ char wxStreamBuffer::Peek()
 
     if ( !GetDataLeft() )
     {
-        SetError(wxStream_READ_ERR);
+        SetError(wxSTREAM_READ_ERROR);
         return 0;
     }
 
     char c;
-    GetFromBuffer(&c, 1);
+    GetFromBuffer(&c, sizeof(c));
     m_buffer_pos--;
 
     return c;
@@ -360,18 +369,18 @@ char wxStreamBuffer::GetChar()
     char c;
     if ( !HasBuffer() )
     {
-        inStream->OnSysRead(&c, 1);
+        inStream->OnSysRead(&c, sizeof(c));
     }
     else
     {
         if ( !GetDataLeft() )
         {
-            SetError(wxStream_READ_ERR);
+            SetError(wxSTREAM_READ_ERROR);
             c = 0;
         }
         else
         {
-            GetFromBuffer(&c, 1);
+            GetFromBuffer(&c, sizeof(c));
             m_stream->m_lastcount = 1;
         }
     }
@@ -381,16 +390,23 @@ char wxStreamBuffer::GetChar()
 
 size_t wxStreamBuffer::Read(void *buffer, size_t size)
 {
-    wxInputStream *inStream = GetInputStream();
+    wxASSERT_MSG( buffer, _T("Warning: Null pointer is about to be used") );
 
-    wxCHECK_MSG( inStream, 0, _T("should have a stream in wxStreamBuffer") );
+    /* Clear buffer first */
+    memset(buffer, 0x00, size);
 
     // lasterror is reset before all new IO calls
-    m_stream->m_lasterror = wxStream_NOERROR;
+    if ( m_stream )
+        m_stream->Reset();
 
+    size_t readBytes;
     if ( !HasBuffer() )
     {
-        m_stream->m_lastcount = inStream->OnSysRead(buffer, size);
+        wxInputStream *inStream = GetInputStream();
+
+        wxCHECK_MSG( inStream, 0, _T("should have a stream in wxStreamBuffer") );
+
+        readBytes = inStream->OnSysRead(buffer, size);
     }
     else // we have a buffer, use it
     {
@@ -410,7 +426,7 @@ size_t wxStreamBuffer::Read(void *buffer, size_t size)
 
                 if ( !FillBuffer() )
                 {
-                    SetError(wxStream_EOF);
+                    SetError(wxSTREAM_EOF);
                     break;
                 }
             }
@@ -421,10 +437,13 @@ size_t wxStreamBuffer::Read(void *buffer, size_t size)
             }
         }
 
-        m_stream->m_lastcount = orig_size - size;
+        readBytes = orig_size - size;
     }
 
-    return m_stream->m_lastcount;
+    if ( m_stream )
+        m_stream->m_lastcount = readBytes;
+
+    return readBytes;
 }
 
 // this should really be called "Copy()"
@@ -438,7 +457,7 @@ size_t wxStreamBuffer::Read(wxStreamBuffer *dbuf)
 
     do
     {
-        nRead = Read(dbuf, WXSIZEOF(buf));
+        nRead = Read(buf, WXSIZEOF(buf));
         if ( nRead )
         {
             nRead = dbuf->Write(buf, nRead);
@@ -452,17 +471,24 @@ size_t wxStreamBuffer::Read(wxStreamBuffer *dbuf)
 
 size_t wxStreamBuffer::Write(const void *buffer, size_t size)
 {
-    wxOutputStream *outStream = GetOutputStream();
+    wxASSERT_MSG( buffer, _T("Warning: Null pointer is about to be send") );
 
-    wxCHECK_MSG( outStream, 0, _T("should have a stream in wxStreamBuffer") );
+    if (m_stream)
+    {
+        // lasterror is reset before all new IO calls
+        m_stream->Reset();
+    }
 
-    // lasterror is reset before all new IO calls
-    m_stream->m_lasterror = wxStream_NOERROR;
+    size_t ret;
 
     if ( !HasBuffer() && m_fixed )
     {
+        wxOutputStream *outStream = GetOutputStream();
+
+        wxCHECK_MSG( outStream, 0, _T("should have a stream in wxStreamBuffer") );
+
         // no buffer, just forward the call to the stream
-        m_stream->m_lastcount = outStream->OnSysWrite(buffer, size);
+        ret = outStream->OnSysWrite(buffer, size);
     }
     else // we [may] have a buffer, use it
     {
@@ -480,6 +506,7 @@ size_t wxStreamBuffer::Write(const void *buffer, size_t size)
             //
             // FIXME: fine, but if it fails we should (re)try writing it by
             //        chunks as this will (hopefully) always work (VZ)
+
             if ( size > left && m_fixed )
             {
                 PutToBuffer(buffer, left);
@@ -488,7 +515,7 @@ size_t wxStreamBuffer::Write(const void *buffer, size_t size)
 
                 if ( !FlushBuffer() )
                 {
-                    SetError(wxStream_WRITE_ERR);
+                    SetError(wxSTREAM_WRITE_ERROR);
 
                     break;
                 }
@@ -502,10 +529,16 @@ size_t wxStreamBuffer::Write(const void *buffer, size_t size)
             }
         }
 
-        m_stream->m_lastcount = orig_size - size;
+        ret = orig_size - size;
     }
 
-    return m_stream->m_lastcount;
+    if (m_stream)
+    {
+        // i am not entirely sure what we do this for
+        m_stream->m_lastcount = ret;
+    }
+
+    return ret;
 }
 
 size_t wxStreamBuffer::Write(wxStreamBuffer *sbuf)
@@ -543,11 +576,11 @@ size_t wxStreamBuffer::Write(wxStreamBuffer *sbuf)
     return total;
 }
 
-off_t wxStreamBuffer::Seek(off_t pos, wxSeekMode mode)
+wxFileOffset wxStreamBuffer::Seek(wxFileOffset pos, wxSeekMode mode)
 {
-    off_t ret_off, diff;
+    wxFileOffset ret_off, diff;
 
-    off_t last_access = GetLastAccess();
+    wxFileOffset last_access = GetLastAccess();
 
     if ( !m_flushable )
     {
@@ -572,7 +605,9 @@ off_t wxStreamBuffer::Seek(off_t pos, wxSeekMode mode)
         }
         if (diff < 0 || diff > last_access)
             return wxInvalidOffset;
-        SetIntPosition(diff);
+        size_t int_diff = wx_truncate_cast(size_t, diff);
+        wxCHECK_MSG( (wxFileOffset)int_diff == diff, wxInvalidOffset, wxT("huge file not supported") );
+        SetIntPosition(int_diff);
         return diff;
     }
 
@@ -597,7 +632,9 @@ off_t wxStreamBuffer::Seek(off_t pos, wxSeekMode mode)
             }
             else
             {
-                SetIntPosition(diff);
+                size_t int_diff = wx_truncate_cast(size_t, diff);
+                wxCHECK_MSG( (wxFileOffset)int_diff == diff, wxInvalidOffset, wxT("huge file not supported") );
+                SetIntPosition(int_diff);
                 return pos;
             }
 
@@ -611,14 +648,12 @@ off_t wxStreamBuffer::Seek(off_t pos, wxSeekMode mode)
     return wxInvalidOffset;
 }
 
-off_t wxStreamBuffer::Tell() const
+wxFileOffset wxStreamBuffer::Tell() const
 {
-    off_t pos;
+    wxFileOffset pos;
 
-    // only ask the stream for position if we have a real stream and not a
-    // dummy one which we created ourselves, otherwise we'd call
-    // wxStream::OnSysTell() which would always return wxInvalidOffset
-    if ( !m_destroystream )
+    // ask the stream for position if we have a real one
+    if ( m_stream )
     {
         pos = m_stream->OnSysTell();
         if ( pos == wxInvalidOffset )
@@ -641,9 +676,11 @@ off_t wxStreamBuffer::Tell() const
 // wxStreamBase
 // ----------------------------------------------------------------------------
 
+IMPLEMENT_ABSTRACT_CLASS(wxStreamBase, wxObject)
+
 wxStreamBase::wxStreamBase()
 {
-    m_lasterror = wxStream_NOERROR;
+    m_lasterror = wxSTREAM_NO_ERROR;
     m_lastcount = 0;
 }
 
@@ -651,12 +688,24 @@ wxStreamBase::~wxStreamBase()
 {
 }
 
-off_t wxStreamBase::OnSysSeek(off_t WXUNUSED(seek), wxSeekMode WXUNUSED(mode))
+size_t wxStreamBase::GetSize() const
+{
+    wxFileOffset length = GetLength();
+    if ( length == (wxFileOffset)wxInvalidOffset )
+        return 0;
+
+    const size_t len = wx_truncate_cast(size_t, length);
+    wxASSERT_MSG( len == length + size_t(0), _T("large files not supported") );
+
+    return len;
+}
+
+wxFileOffset wxStreamBase::OnSysSeek(wxFileOffset WXUNUSED(seek), wxSeekMode WXUNUSED(mode))
 {
     return wxInvalidOffset;
 }
 
-off_t wxStreamBase::OnSysTell() const
+wxFileOffset wxStreamBase::OnSysTell() const
 {
     return wxInvalidOffset;
 }
@@ -665,6 +714,8 @@ off_t wxStreamBase::OnSysTell() const
 // wxInputStream
 // ----------------------------------------------------------------------------
 
+IMPLEMENT_ABSTRACT_CLASS(wxInputStream, wxStreamBase)
+
 wxInputStream::wxInputStream()
 {
     m_wback = NULL;
@@ -677,31 +728,19 @@ wxInputStream::~wxInputStream()
     free(m_wback);
 }
 
-size_t wxInputStream::OnSysRead(void * WXUNUSED(buffer),
-                                size_t WXUNUSED(bufsize))
+bool wxInputStream::CanRead() const
 {
-    return 0;
+    // we don't know if there is anything to read or not and by default we
+    // prefer to be optimistic and try to read data unless we know for sure
+    // there is no more of it
+    return m_lasterror != wxSTREAM_EOF;
 }
 
 bool wxInputStream::Eof() const
 {
-    wxInputStream *self = wxConstCast(this, wxInputStream);
-
-    char c;
-    self->Read(&c, 1);
-
-    // some streams can know that they're at EOF before actually trying to
-    // read beyond the end of stream (e.g. files) while others have no way of
-    // knowing it, so to provide the same behaviour in all cases we only
-    // return TRUE from here if the character really couldn't be read
-    if ( !self->LastRead() && GetLastError() == wxSTREAM_EOF )
-    {
-        return TRUE;
-    }
-
-    self->Ungetch(c);
-
-    return FALSE;
+    // the only way the base class can know we're at EOF is when we'd already
+    // tried to read beyond it in which case last error is set accordingly
+    return GetLastError() == wxSTREAM_EOF;
 }
 
 char *wxInputStream::AllocSpaceWBack(size_t needed_size)
@@ -730,21 +769,26 @@ char *wxInputStream::AllocSpaceWBack(size_t needed_size)
     return m_wback;
 }
 
-size_t wxInputStream::GetWBack(void *buf, size_t bsize)
+size_t wxInputStream::GetWBack(void *buf, size_t size)
 {
+    wxASSERT_MSG( buf, _T("Warning: Null pointer is about to be used") );
+
+    /* Clear buffer first */
+    memset(buf, 0x00, size);
+
     if (!m_wback)
         return 0;
 
     // how many bytes do we have in the buffer?
     size_t toget = m_wbacksize - m_wbackcur;
 
-    if ( bsize < toget )
+    if ( size < toget )
     {
         // we won't read everything
-        toget = bsize;
+        toget = size;
     }
 
-    // copy the data from the cache 
+    // copy the data from the cache
     memcpy(buf, m_wback + m_wbackcur, toget);
 
     m_wbackcur += toget;
@@ -763,6 +807,8 @@ size_t wxInputStream::GetWBack(void *buf, size_t bsize)
 
 size_t wxInputStream::Ungetch(const void *buf, size_t bufsize)
 {
+    wxASSERT_MSG( buf, _T("Warning: Null pointer is about to be used in Ungetch()") );
+
     if ( m_lasterror != wxSTREAM_NO_ERROR && m_lasterror != wxSTREAM_EOF )
     {
         // can't operate on this stream until the error is cleared
@@ -773,7 +819,7 @@ size_t wxInputStream::Ungetch(const void *buf, size_t bufsize)
     if (!ptrback)
         return 0;
 
-    // Eof() shouldn't return TRUE any longer
+    // Eof() shouldn't return true any longer
     if ( m_lasterror == wxSTREAM_EOF )
         m_lasterror = wxSTREAM_NO_ERROR;
 
@@ -783,18 +829,20 @@ size_t wxInputStream::Ungetch(const void *buf, size_t bufsize)
 
 bool wxInputStream::Ungetch(char c)
 {
-    return Ungetch(&c, sizeof(char)) != 0;
+    return Ungetch(&c, sizeof(c)) != 0;
 }
 
-char wxInputStream::GetC()
+int wxInputStream::GetC()
 {
-    char c;
-    Read(&c, 1);
-    return c;
+    unsigned char c;
+    Read(&c, sizeof(c));
+    return LastRead() ? c : wxEOF;
 }
 
 wxInputStream& wxInputStream::Read(void *buf, size_t size)
 {
+    wxASSERT_MSG( buf, _T("Warning: Null pointer is about to be read") );
+
     char *p = (char *)buf;
     m_lastcount = 0;
 
@@ -811,6 +859,13 @@ wxInputStream& wxInputStream::Read(void *buf, size_t size)
             break;
         }
 
+        if ( p != buf && !CanRead() )
+        {
+            // we have already read something and we would block in OnSysRead()
+            // now: don't do it but return immediately
+            break;
+        }
+
         read = OnSysRead(p, size);
         if ( !read )
         {
@@ -825,8 +880,8 @@ wxInputStream& wxInputStream::Read(void *buf, size_t size)
 char wxInputStream::Peek()
 {
     char c;
-    Read(&c, 1);
-    if (m_lasterror == wxStream_NOERROR)
+    Read(&c, sizeof(c));
+    if (m_lasterror == wxSTREAM_NO_ERROR)
     {
         Ungetch(c);
         return c;
@@ -837,18 +892,27 @@ char wxInputStream::Peek()
 
 wxInputStream& wxInputStream::Read(wxOutputStream& stream_out)
 {
+    size_t lastcount = 0;
     char buf[BUF_TEMP_SIZE];
-    size_t bytes_read = BUF_TEMP_SIZE;
 
-    while (bytes_read == BUF_TEMP_SIZE)
+    for ( ;; )
     {
-        bytes_read = Read(buf, bytes_read).LastRead();
-        bytes_read = stream_out.Write(buf, bytes_read).LastWrite();
+        size_t bytes_read = Read(buf, WXSIZEOF(buf)).LastRead();
+        if ( !bytes_read )
+            break;
+
+        if ( stream_out.Write(buf, bytes_read).LastWrite() != bytes_read )
+            break;
+
+        lastcount += bytes_read;
     }
+
+    m_lastcount = lastcount;
+
     return *this;
 }
 
-off_t wxInputStream::SeekI(off_t pos, wxSeekMode mode)
+wxFileOffset wxInputStream::SeekI(wxFileOffset pos, wxSeekMode mode)
 {
     // RR: This code is duplicated in wxBufferedInputStream. This is
     // not really a good design, but buffered stream are different
@@ -857,7 +921,7 @@ off_t wxInputStream::SeekI(off_t pos, wxSeekMode mode)
 
     // I don't know whether it should be put as well in wxFileInputStream::OnSysSeek
     if (m_lasterror==wxSTREAM_EOF)
-        m_lasterror=wxSTREAM_NOERROR;
+        m_lasterror=wxSTREAM_NO_ERROR;
 
     /* RR: A call to SeekI() will automatically invalidate any previous
        call to Ungetch(), otherwise it would be possible to SeekI() to
@@ -868,11 +932,11 @@ off_t wxInputStream::SeekI(off_t pos, wxSeekMode mode)
        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)
     {
         wxLogDebug( wxT("Seeking in stream which has data written back to it.") );
-        
+
         free(m_wback);
         m_wback = NULL;
         m_wbacksize = 0;
@@ -882,9 +946,9 @@ off_t wxInputStream::SeekI(off_t pos, wxSeekMode mode)
     return OnSysSeek(pos, mode);
 }
 
-off_t wxInputStream::TellI() const
+wxFileOffset wxInputStream::TellI() const
 {
-    off_t pos = OnSysTell();
+    wxFileOffset pos = OnSysTell();
 
     if (pos != wxInvalidOffset)
         pos -= (m_wbacksize - m_wbackcur);
@@ -897,6 +961,8 @@ off_t wxInputStream::TellI() const
 // wxOutputStream
 // ----------------------------------------------------------------------------
 
+IMPLEMENT_ABSTRACT_CLASS(wxOutputStream, wxStreamBase)
+
 wxOutputStream::wxOutputStream()
 {
 }
@@ -913,7 +979,7 @@ size_t wxOutputStream::OnSysWrite(const void * WXUNUSED(buffer),
 
 void wxOutputStream::PutC(char c)
 {
-    Write(&c, 1);
+    Write(&c, sizeof(c));
 }
 
 wxOutputStream& wxOutputStream::Write(const void *buffer, size_t size)
@@ -928,12 +994,12 @@ wxOutputStream& wxOutputStream::Write(wxInputStream& stream_in)
     return *this;
 }
 
-off_t wxOutputStream::TellO() const
+wxFileOffset wxOutputStream::TellO() const
 {
     return OnSysTell();
 }
 
-off_t wxOutputStream::SeekO(off_t pos, wxSeekMode mode)
+wxFileOffset wxOutputStream::SeekO(wxFileOffset pos, wxSeekMode mode)
 {
     return OnSysSeek(pos, mode);
 }
@@ -947,12 +1013,14 @@ void wxOutputStream::Sync()
 // wxCountingOutputStream
 // ----------------------------------------------------------------------------
 
+IMPLEMENT_DYNAMIC_CLASS(wxCountingOutputStream, wxOutputStream)
+
 wxCountingOutputStream::wxCountingOutputStream ()
 {
      m_currentPos = 0;
 }
 
-size_t wxCountingOutputStream::GetSize() const
+wxFileOffset wxCountingOutputStream::GetLength() const
 {
     return m_lastcount;
 }
@@ -967,20 +1035,24 @@ size_t wxCountingOutputStream::OnSysWrite(const void *WXUNUSED(buffer),
     return m_currentPos;
 }
 
-off_t wxCountingOutputStream::OnSysSeek(off_t pos, wxSeekMode mode)
+wxFileOffset wxCountingOutputStream::OnSysSeek(wxFileOffset pos, wxSeekMode mode)
 {
+    ssize_t new_pos = wx_truncate_cast(ssize_t, pos);
+
     switch ( mode )
     {
         case wxFromStart:
-            m_currentPos = pos;
+            wxCHECK_MSG( (wxFileOffset)new_pos == pos, wxInvalidOffset, wxT("huge position not supported") );
             break;
 
         case wxFromEnd:
-            m_currentPos = m_lastcount + pos;
+            new_pos = m_lastcount + new_pos;
+            wxCHECK_MSG( (wxFileOffset)new_pos == (wxFileOffset)(m_lastcount + pos), wxInvalidOffset, wxT("huge position not supported") );
             break;
 
         case wxFromCurrent:
-            m_currentPos += pos;
+            new_pos = m_currentPos + new_pos;
+            wxCHECK_MSG( (wxFileOffset)new_pos == (wxFileOffset)(m_currentPos + pos), wxInvalidOffset, wxT("huge position not supported") );
             break;
 
         default:
@@ -988,13 +1060,15 @@ off_t wxCountingOutputStream::OnSysSeek(off_t pos, wxSeekMode mode)
             return wxInvalidOffset;
     }
 
+    m_currentPos = new_pos;
+
     if (m_currentPos > m_lastcount)
         m_lastcount = m_currentPos;
 
     return m_currentPos;
 }
 
-off_t wxCountingOutputStream::OnSysTell() const
+wxFileOffset wxCountingOutputStream::OnSysTell() const
 {
     return m_currentPos;
 }
@@ -1003,36 +1077,127 @@ off_t wxCountingOutputStream::OnSysTell() const
 // wxFilterInputStream
 // ----------------------------------------------------------------------------
 
+IMPLEMENT_ABSTRACT_CLASS(wxFilterInputStream, wxInputStream)
+
 wxFilterInputStream::wxFilterInputStream()
+ :  m_parent_i_stream(NULL),
+    m_owns(false)
 {
-    m_parent_i_stream = NULL;
 }
 
 wxFilterInputStream::wxFilterInputStream(wxInputStream& stream)
+ :  m_parent_i_stream(&stream),
+    m_owns(false)
+{
+}
+
+wxFilterInputStream::wxFilterInputStream(wxInputStream *stream)
+ :  m_parent_i_stream(stream),
+    m_owns(true)
 {
-    m_parent_i_stream = &stream;
 }
 
 wxFilterInputStream::~wxFilterInputStream()
 {
+    if (m_owns)
+        delete m_parent_i_stream;
 }
 
 // ----------------------------------------------------------------------------
 // wxFilterOutputStream
 // ----------------------------------------------------------------------------
 
+IMPLEMENT_ABSTRACT_CLASS(wxFilterOutputStream, wxOutputStream)
+
 wxFilterOutputStream::wxFilterOutputStream()
+ :  m_parent_o_stream(NULL),
+    m_owns(false)
 {
-    m_parent_o_stream = NULL;
 }
 
 wxFilterOutputStream::wxFilterOutputStream(wxOutputStream& stream)
+ :  m_parent_o_stream(&stream),
+    m_owns(false)
+{
+}
+
+wxFilterOutputStream::wxFilterOutputStream(wxOutputStream *stream)
+ :  m_parent_o_stream(stream),
+    m_owns(true)
 {
-    m_parent_o_stream = &stream;
+}
+
+bool wxFilterOutputStream::Close()
+{
+    if (m_parent_o_stream && m_owns)
+        return m_parent_o_stream->Close();
+    else
+        return true;
 }
 
 wxFilterOutputStream::~wxFilterOutputStream()
 {
+    if (m_owns)
+        delete m_parent_o_stream;
+}
+
+// ----------------------------------------------------------------------------
+// wxFilterClassFactoryBase
+// ----------------------------------------------------------------------------
+
+IMPLEMENT_ABSTRACT_CLASS(wxFilterClassFactoryBase, wxObject)
+
+wxString wxFilterClassFactoryBase::PopExtension(const wxString& location) const
+{
+    return location.substr(0, FindExtension(location));
+}
+
+wxString::size_type wxFilterClassFactoryBase::FindExtension(
+        const wxString& location) const
+{
+    for (const wxChar *const *p = GetProtocols(wxSTREAM_FILEEXT); *p; p++)
+    {
+        if ( location.EndsWith(*p) )
+            return location.length() - wxStrlen(*p);
+    }
+
+    return wxString::npos;
+}
+
+bool wxFilterClassFactoryBase::CanHandle(const wxString& protocol,
+                                         wxStreamProtocolType type) const
+{
+    if (type == wxSTREAM_FILEEXT)
+        return FindExtension(protocol) != wxString::npos;
+    else
+        for (const wxChar *const *p = GetProtocols(type); *p; p++)
+            if (protocol == *p)
+                return true;
+
+    return false;
+}
+
+// ----------------------------------------------------------------------------
+// wxFilterClassFactory
+// ----------------------------------------------------------------------------
+
+IMPLEMENT_ABSTRACT_CLASS(wxFilterClassFactory, wxFilterClassFactoryBase)
+
+wxFilterClassFactory *wxFilterClassFactory::sm_first = NULL;
+
+void wxFilterClassFactory::Remove()
+{
+    if (m_next != this)
+    {
+        wxFilterClassFactory **pp = &sm_first;
+
+        while (*pp != this)
+            pp = &(*pp)->m_next;
+
+        *pp = m_next;
+
+        m_next = this;
+    }
 }
 
 // ----------------------------------------------------------------------------
@@ -1058,7 +1223,7 @@ wxBufferedInputStream::wxBufferedInputStream(wxInputStream& s,
 
 wxBufferedInputStream::~wxBufferedInputStream()
 {
-    m_parent_i_stream->SeekI(-(off_t)m_i_streambuf->GetBytesLeft(),
+    m_parent_i_stream->SeekI(-(wxFileOffset)m_i_streambuf->GetBytesLeft(),
                              wxFromCurrent);
 
     delete m_i_streambuf;
@@ -1072,7 +1237,7 @@ char wxBufferedInputStream::Peek()
 wxInputStream& wxBufferedInputStream::Read(void *buf, size_t size)
 {
     // reset the error flag
-    m_lasterror = wxStream_NOERROR;
+    Reset();
 
     // first read from the already cached data
     m_lastcount = GetWBack(buf, size);
@@ -1083,45 +1248,48 @@ wxInputStream& wxBufferedInputStream::Read(void *buf, size_t size)
         size -= m_lastcount;
         buf = (char *)buf + m_lastcount;
 
-        // the call to wxStreamBuffer::Read() below will reset our m_lastcount,
-        // so save it
+        // the call to wxStreamBuffer::Read() below may reset our m_lastcount
+        // (but it also may not do it if the buffer is associated to another
+        // existing stream and wasn't created by us), so save it
         size_t countOld = m_lastcount;
 
-        m_i_streambuf->Read(buf, size);
+        // the new count of the bytes read is the count of bytes read this time
+        m_lastcount = m_i_streambuf->Read(buf, size);
 
+        // plus those we had read before
         m_lastcount += countOld;
     }
 
     return *this;
 }
 
-off_t wxBufferedInputStream::SeekI(off_t pos, wxSeekMode mode)
+wxFileOffset wxBufferedInputStream::SeekI(wxFileOffset pos, wxSeekMode mode)
 {
     // RR: Look at wxInputStream for comments.
 
     if (m_lasterror==wxSTREAM_EOF)
-        m_lasterror=wxSTREAM_NOERROR;
+        Reset();
 
     if (m_wback)
     {
         wxLogDebug( wxT("Seeking in stream which has data written back to it.") );
-        
+
         free(m_wback);
         m_wback = NULL;
         m_wbacksize = 0;
         m_wbackcur = 0;
     }
-    
+
     return m_i_streambuf->Seek(pos, mode);
 }
 
-off_t wxBufferedInputStream::TellI() const
+wxFileOffset wxBufferedInputStream::TellI() const
 {
-    off_t pos = m_i_streambuf->Tell();
+    wxFileOffset pos = m_i_streambuf->Tell();
 
     if (pos != wxInvalidOffset)
         pos -= (m_wbacksize - m_wbackcur);
-        
+
     return pos;
 }
 
@@ -1130,12 +1298,12 @@ size_t wxBufferedInputStream::OnSysRead(void *buffer, size_t bufsize)
     return m_parent_i_stream->Read(buffer, bufsize).LastRead();
 }
 
-off_t wxBufferedInputStream::OnSysSeek(off_t seek, wxSeekMode mode)
+wxFileOffset wxBufferedInputStream::OnSysSeek(wxFileOffset seek, wxSeekMode mode)
 {
     return m_parent_i_stream->SeekI(seek, mode);
 }
 
-off_t wxBufferedInputStream::OnSysTell() const
+wxFileOffset wxBufferedInputStream::OnSysTell() const
 {
     return m_parent_i_stream->TellI();
 }
@@ -1174,6 +1342,13 @@ wxBufferedOutputStream::~wxBufferedOutputStream()
     delete m_o_streambuf;
 }
 
+bool wxBufferedOutputStream::Close()
+{
+    Sync();
+    return IsOk();
+}
+
+
 wxOutputStream& wxBufferedOutputStream::Write(const void *buffer, size_t size)
 {
     m_lastcount = 0;
@@ -1181,13 +1356,13 @@ wxOutputStream& wxBufferedOutputStream::Write(const void *buffer, size_t size)
     return *this;
 }
 
-off_t wxBufferedOutputStream::SeekO(off_t pos, wxSeekMode mode)
+wxFileOffset wxBufferedOutputStream::SeekO(wxFileOffset pos, wxSeekMode mode)
 {
     Sync();
     return m_o_streambuf->Seek(pos, mode);
 }
 
-off_t wxBufferedOutputStream::TellO() const
+wxFileOffset wxBufferedOutputStream::TellO() const
 {
     return m_o_streambuf->Tell();
 }
@@ -1203,19 +1378,19 @@ 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)
+wxFileOffset wxBufferedOutputStream::OnSysSeek(wxFileOffset seek, wxSeekMode mode)
 {
     return m_parent_o_stream->SeekO(seek, mode);
 }
 
-off_t wxBufferedOutputStream::OnSysTell() const
+wxFileOffset wxBufferedOutputStream::OnSysTell() const
 {
     return m_parent_o_stream->TellO();
 }
 
-size_t wxBufferedOutputStream::GetSize() const
+wxFileOffset wxBufferedOutputStream::GetLength() const
 {
-   return m_parent_o_stream->GetSize() + m_o_streambuf->GetIntPosition();
+   return m_parent_o_stream->GetLength() + m_o_streambuf->GetIntPosition();
 }
 
 void wxBufferedOutputStream::SetOutputStreamBuffer(wxStreamBuffer *buffer)
@@ -1237,5 +1412,4 @@ wxOutputStream& wxEndL(wxOutputStream& stream)
     return stream.Write(eol, wxStrlen(eol));
 }
 
-#endif
-  // wxUSE_STREAMS
+#endif // wxUSE_STREAMS