supporting promised file urls for transfer, see #14281

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

diff --git a/src/common/mstream.cpp b/src/common/mstream.cpp
index a12041ee0e633286fb6d1064d4692197baf95d06..66af403e2f8140fe46874da4ddd3dcf8902f4cd1 100644 (file)
--- a/src/common/mstream.cpp
+++ b/src/common/mstream.cpp
@@ -1,133 +1,207 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        mmstream.cpp
+// Name:        src/common/mstream.cpp

 // Purpose:     "Memory stream" classes
 // Author:      Guilhem Lavaux
 // Purpose:     "Memory stream" classes
 // Author:      Guilhem Lavaux

-// Modified by:
+// Modified by: VZ (23.11.00): general code review

 // Created:     04/01/98
 // RCS-ID:      $Id$
 // Copyright:   (c) Guilhem Lavaux
 // Created:     04/01/98
 // RCS-ID:      $Id$
 // Copyright:   (c) Guilhem Lavaux

-// Licence:     wxWindows license
+// Licence:     wxWindows licence

 /////////////////////////////////////////////////////////////////////////////
 
 /////////////////////////////////////////////////////////////////////////////
 

-#ifdef __GNUG__
-#pragma implementation "mmstream.h"
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
+// For compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
+
+#ifdef __BORLANDC__
+    #pragma hdrstop

 #endif
 
 #endif
 

+#if wxUSE_STREAMS
+
+#include "wx/mstream.h"
+
+#ifndef   WX_PRECOMP
+    #include  "wx/stream.h"
+#endif  //WX_PRECOMP
+

 #include <stdlib.h>
 #include <stdlib.h>

-#include <wx/stream.h>
-#include <wx/mmstream.h>

 
 

-wxMemoryStreamBase::wxMemoryStreamBase(char *data, size_t length, int iolimit)
-{
-  m_buffer = data;
-  m_iolimit = iolimit;
-  m_persistent = FALSE;
-  m_length = length;
-  m_position_i = m_position_o = 0;
-}
+// ============================================================================
+// implementation
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// wxMemoryInputStream
+// ----------------------------------------------------------------------------

 
 

-wxMemoryStreamBase::~wxMemoryStreamBase()
+IMPLEMENT_ABSTRACT_CLASS(wxMemoryInputStream, wxInputStream)
+
+wxMemoryInputStream::wxMemoryInputStream(const void *data, size_t len)

 {
 {

-  free(m_buffer);
+    m_i_streambuf = new wxStreamBuffer(wxStreamBuffer::read);
+    m_i_streambuf->SetBufferIO(const_cast<void *>(data), len);
+    m_i_streambuf->SetIntPosition(0); // seek to start pos
+    m_i_streambuf->Fixed(true);
+
+    m_length = len;

 }
 
 }
 

-wxInputStream& wxMemoryStreamBase::Read(void *buffer, size_t size)
+wxMemoryInputStream::wxMemoryInputStream(const wxMemoryOutputStream& stream)

 {
 {

-  if (m_iolimit == 2) {
-    m_eof = TRUE;
-    return *this;
-  }
-  if (m_position_i+size > m_length)
-    size = m_length-m_position_i;
-
-  memcpy((void *)((unsigned long)buffer+m_position_i), m_buffer, size);
-  m_position_i += size;
-  m_lastread = size;
-
-  return *this;
+    const wxFileOffset lenFile = stream.GetLength();
+    if ( lenFile == wxInvalidOffset )
+    {
+        m_i_streambuf = NULL;
+        m_lasterror = wxSTREAM_EOF;
+        return;
+    }
+
+    const size_t len = wx_truncate_cast(size_t, lenFile);
+    wxASSERT_MSG( len == lenFile + size_t(0), wxT("huge files not supported") );
+
+    m_i_streambuf = new wxStreamBuffer(wxStreamBuffer::read);
+    m_i_streambuf->SetBufferIO(len); // create buffer
+    stream.CopyTo(m_i_streambuf->GetBufferStart(), len);
+    m_i_streambuf->SetIntPosition(0); // seek to start pos
+    m_i_streambuf->Fixed(true);
+    m_length = len;

 }
 
 }
 

-size_t wxMemoryStreamBase::SeekI(int pos, wxWhenceType whence)
+void
+wxMemoryInputStream::InitFromStream(wxInputStream& stream, wxFileOffset lenFile)

 {
 {

-  if (m_iolimit == 2)
-    return 0;
+    if ( lenFile == wxInvalidOffset )
+        lenFile = stream.GetLength();
+
+    if ( lenFile == wxInvalidOffset )
+    {
+        m_i_streambuf = NULL;
+        m_lasterror = wxSTREAM_EOF;
+        return;
+    }

 
 

-  switch (whence) {
-  case wxBeginPosition:
-    if ((size_t)pos > m_length)
-      return m_position_i;
-    return (m_position_i = pos);
+    const size_t len = wx_truncate_cast(size_t, lenFile);
+    wxASSERT_MSG( (wxFileOffset)len == lenFile, wxT("huge files not supported") );

 
 

-  case wxCurrentPosition:
-    if ((size_t)(m_position_i+pos) > m_length)
-      return m_position_i;
+    m_i_streambuf = new wxStreamBuffer(wxStreamBuffer::read);
+    m_i_streambuf->SetBufferIO(len); // create buffer
+    stream.Read(m_i_streambuf->GetBufferStart(), len);
+    m_i_streambuf->SetIntPosition(0); // seek to start pos
+    m_i_streambuf->Fixed(true);
+    m_length = stream.LastRead();
+}

 
 

-    return (m_position_i += pos);
+bool wxMemoryInputStream::CanRead() const
+{
+    return m_i_streambuf->GetIntPosition() != m_length;
+}

 
 

-  case wxEndPosition:
-    if ((size_t)(m_length-pos) > m_length)
-      return m_position_i;
+wxMemoryInputStream::~wxMemoryInputStream()
+{
+    delete m_i_streambuf;
+}

 
 

-    return (m_position_i = m_length-pos);
-  }
+char wxMemoryInputStream::Peek()
+{
+    char *buf = (char *)m_i_streambuf->GetBufferStart();
+    size_t pos = m_i_streambuf->GetIntPosition();
+    if ( pos == m_length )
+    {
+        m_lasterror = wxSTREAM_READ_ERROR;

 
 

-  return m_position_i;
+        return 0;
+    }
+
+    return buf[pos];

 }
 
 }
 

-wxOutputStream& wxMemoryStreamBase::Write(const void *buffer, size_t size)
+size_t wxMemoryInputStream::OnSysRead(void *buffer, size_t nbytes)

 {
 {

-  if (m_iolimit == 1) {
-    m_bad = TRUE;
-    return *this;
-  }
-  
-  if (m_position_o+size > m_length)
-    if (!ChangeBufferSize(m_position_o+size)) {
-      m_bad = TRUE;
-      return *this;
+    size_t pos = m_i_streambuf->GetIntPosition();
+    if ( pos == m_length )
+    {
+        m_lasterror = wxSTREAM_EOF;
+
+        return 0;

     }
 
     }
 

-  memcpy(m_buffer+m_position_o, buffer, size);
-  m_position_o += size;
-  m_lastwrite = size;
+    m_i_streambuf->Read(buffer, nbytes);
+    m_lasterror = wxSTREAM_NO_ERROR;

 
 

-  return *this;
+    return m_i_streambuf->GetIntPosition() - pos;

 }
 
 }
 

-size_t wxMemoryStreamBase::SeekO(int pos, wxWhenceType whence)
+wxFileOffset wxMemoryInputStream::OnSysSeek(wxFileOffset pos, wxSeekMode mode)

 {
 {

-  if (m_iolimit == 2)
-    return 0;
+    return m_i_streambuf->Seek(pos, mode);
+}

 
 

-  switch (whence) {
-  case wxBeginPosition:
-    if ((size_t)pos > m_length)
-      return m_position_o;
-    return (m_position_o = pos);
+wxFileOffset wxMemoryInputStream::OnSysTell() const
+{
+    return m_i_streambuf->Tell();
+}

 
 

-  case wxCurrentPosition:
-    if ((size_t)(m_position_o+pos) > m_length)
-      return m_position_o;
+// ----------------------------------------------------------------------------
+// wxMemoryOutputStream
+// ----------------------------------------------------------------------------

 
 

-    return (m_position_o += pos);
+IMPLEMENT_DYNAMIC_CLASS(wxMemoryOutputStream, wxOutputStream)

 
 

-  case wxEndPosition:
-    if ((size_t)(m_length-pos) > m_length)
-      return m_position_o;
+wxMemoryOutputStream::wxMemoryOutputStream(void *data, size_t len)
+{
+    m_o_streambuf = new wxStreamBuffer(wxStreamBuffer::write);
+    if ( data )
+        m_o_streambuf->SetBufferIO(data, len);
+    m_o_streambuf->Fixed(false);
+    m_o_streambuf->Flushable(false);
+}

 
 

-    return (m_position_o = m_length-pos);
-  }
+wxMemoryOutputStream::~wxMemoryOutputStream()
+{
+    delete m_o_streambuf;
+}
+
+size_t wxMemoryOutputStream::OnSysWrite(const void *buffer, size_t nbytes)
+{
+    size_t oldpos = m_o_streambuf->GetIntPosition();
+    m_o_streambuf->Write(buffer, nbytes);
+    size_t newpos = m_o_streambuf->GetIntPosition();

 
 

-  return m_position_o;
+    // FIXME can someone please explain what this does? (VZ)
+    if ( !newpos )
+        newpos = m_o_streambuf->GetBufferSize();
+
+    return newpos - oldpos;
+}
+
+wxFileOffset wxMemoryOutputStream::OnSysSeek(wxFileOffset pos, wxSeekMode mode)
+{
+    return m_o_streambuf->Seek(pos, mode);
+}
+
+wxFileOffset wxMemoryOutputStream::OnSysTell() const
+{
+    return m_o_streambuf->Tell();

 }
 
 }
 

-bool wxMemoryStreamBase::ChangeBufferSize(size_t new_size)
+size_t wxMemoryOutputStream::CopyTo(void *buffer, size_t len) const

 {
 {

-  m_length = new_size;
-  if (!m_buffer)
-    m_buffer = (char *)malloc(m_length);
-  else
-    m_buffer = (char *)realloc(m_buffer, m_length);
+    wxCHECK_MSG( buffer, 0, wxT("must have buffer to CopyTo") );
+
+    if ( len > GetSize() )
+        len = GetSize();

 
 

-  return (m_buffer != NULL);
+    memcpy(buffer, m_o_streambuf->GetBufferStart(), len);
+
+    return len;

 }
 }

+
+#endif // wxUSE_STREAMS