wxX11:

[wxWidgets.git] / src / common / stream.cpp

diff --git a/src/common/stream.cpp b/src/common/stream.cpp
index 0a6991a42ff3c89bd954b23deeb557f463057881..c6ffc3895be16d426d10abaa53cacef505c54a85 100644 (file)
--- a/src/common/stream.cpp
+++ b/src/common/stream.cpp
@@ -38,7 +38,7 @@
 #include <ctype.h>
 #include "wx/stream.h"
 #include "wx/datstrm.h"
-#include "wx/objstrm.h"
+#include "wx/textfile.h"
 
 // ----------------------------------------------------------------------------
 // constants
@@ -68,8 +68,8 @@ void wxStreamBuffer::InitBuffer()
     m_buffer_pos = NULL;
     m_buffer_size = 0;
 
-    // there is nothing to destroy anyhow
-    m_destroybuf = FALSE;
+    // if we are going to allocate the buffer, we should free it later as well
+    m_destroybuf = TRUE;
 }
 
 void wxStreamBuffer::Init()
@@ -81,22 +81,31 @@ void wxStreamBuffer::Init()
 
 wxStreamBuffer::wxStreamBuffer(wxStreamBase& stream, BufMode mode)
 {
+    Init();
+
     m_stream = &stream;
     m_mode = mode;
 
     m_flushable = TRUE;
     m_destroystream = FALSE;
-    m_destroybuf = FALSE;
 }
 
 wxStreamBuffer::wxStreamBuffer(BufMode mode)
 {
-    m_stream = new wxStreamBase;
+    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_mode = mode;
 
     m_flushable = FALSE;
     m_destroystream = TRUE;
-    m_destroybuf = FALSE;
 }
 
 wxStreamBuffer::wxStreamBuffer(const wxStreamBuffer& buffer)
@@ -163,7 +172,7 @@ void wxStreamBuffer::SetBufferIO(void *start,
     m_buffer_size = len;
 
     // if we own it, we free it
-    m_destroybuf = !takeOwnership;
+    m_destroybuf = takeOwnership;
 
     ResetBuffer();
 }
@@ -667,7 +676,12 @@ bool wxInputStream::Eof() const
 
     char c;
     self->Read(&c, 1);
-    if ( GetLastError() == wxSTREAM_EOF )
+
+    // 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;
     }
@@ -705,25 +719,32 @@ char *wxInputStream::AllocSpaceWBack(size_t needed_size)
 
 size_t wxInputStream::GetWBack(void *buf, size_t bsize)
 {
-    size_t toget = m_wbacksize-m_wbackcur;
-
     if (!m_wback)
         return 0;
 
-    if (bsize < toget)
-       toget = bsize;
+    // how many bytes do we have in the buffer?
+    size_t toget = m_wbacksize - m_wbackcur;
+
+    if ( bsize < toget )
+    {
+        // we won't read everything
+        toget = bsize;
+    }
 
-    memcpy(buf, (m_wback+m_wbackcur), toget);
+    // copy the data from the cache 
+    memcpy(buf, m_wback + m_wbackcur, toget);
 
     m_wbackcur += toget;
-    if (m_wbackcur == m_wbacksize)
+    if ( m_wbackcur == m_wbacksize )
     {
+        // TODO: should we really free it here all the time? maybe keep it?
         free(m_wback);
         m_wback = NULL;
         m_wbacksize = 0;
         m_wbackcur = 0;
     }
 
+    // return the number of bytes copied
     return toget;
 }
 
@@ -835,19 +856,6 @@ off_t wxInputStream::TellI() const
     return pos;
 }
 
-// --------------------
-// Overloaded operators
-// --------------------
-
-#if wxUSE_SERIAL
-wxInputStream& wxInputStream::operator>>(wxObject *& obj)
-{
-    wxObjectInputStream obj_s(*this);
-    obj = obj_s.LoadObject();
-    return *this;
-}
-#endif // wxUSE_SERIAL
-
 
 // ----------------------------------------------------------------------------
 // wxOutputStream
@@ -898,14 +906,6 @@ void wxOutputStream::Sync()
 {
 }
 
-#if wxUSE_SERIAL
-wxOutputStream& wxOutputStream::operator<<(wxObject& obj)
-{
-    wxObjectOutputStream obj_s(*this);
-    obj_s.SaveObject(obj);
-    return *this;
-}
-#endif // wxUSE_SERIAL
 
 // ----------------------------------------------------------------------------
 // wxCountingOutputStream
@@ -1022,7 +1022,8 @@ wxBufferedInputStream::wxBufferedInputStream(wxInputStream& s,
 
 wxBufferedInputStream::~wxBufferedInputStream()
 {
-    m_parent_i_stream->SeekI(-m_i_streambuf->GetBytesLeft(), wxFromCurrent);
+    m_parent_i_stream->SeekI(-(off_t)m_i_streambuf->GetBytesLeft(),
+                             wxFromCurrent);
 
     delete m_i_streambuf;
 }
@@ -1034,19 +1035,26 @@ char wxBufferedInputStream::Peek()
 
 wxInputStream& wxBufferedInputStream::Read(void *buf, size_t size)
 {
-    size_t retsize;
+    // reset the error flag
+    m_lasterror = wxStream_NOERROR;
 
-    retsize = GetWBack(buf, size);
-    m_lastcount = retsize;
-    if ( retsize == size )
+    // first read from the already cached data
+    m_lastcount = GetWBack(buf, size);
+
+    // do we have to read anything more?
+    if ( m_lastcount < size )
     {
-        m_lasterror = wxStream_NOERROR;
-        return *this;
-    }
-    size -= retsize;
-    buf = (char *)buf + retsize;
+        size -= m_lastcount;
+        buf = (char *)buf + m_lastcount;
+
+        // the call to wxStreamBuffer::Read() below will reset our m_lastcount,
+        // so save it
+        size_t countOld = m_lastcount;
+
+        m_i_streambuf->Read(buf, size);
 
-    m_i_streambuf->Read(buf, size);
+        m_lastcount += countOld;
+    }
 
     return *this;
 }
@@ -1168,15 +1176,9 @@ void wxBufferedOutputStream::SetOutputStreamBuffer(wxStreamBuffer *buffer)
 
 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
+    static const wxChar *eol = wxTextFile::GetEOL();
+
+    return stream.Write(eol, wxStrlen(eol));
 }
 
 #endif