/////////////////////////////////////////////////////////////////////////////
-// Name: mstream.cpp
+// Name: src/common/mstream.cpp
// 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
-// Licence: wxWindows license
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
-#ifdef __GNUG__
-#pragma implementation "mstream.h"
-#endif
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
- #pragma hdrstop
+ #pragma hdrstop
#endif
#if wxUSE_STREAMS
-#include <stdlib.h>
-#include "wx/stream.h"
#include "wx/mstream.h"
+#ifndef WX_PRECOMP
+ #include "wx/stream.h"
+#endif //WX_PRECOMP
+
+#include <stdlib.h>
+
+// ============================================================================
+// implementation
+// ============================================================================
+
// ----------------------------------------------------------------------------
// wxMemoryInputStream
// ----------------------------------------------------------------------------
-wxMemoryInputStream::wxMemoryInputStream(const char *data, size_t len)
- : wxInputStream()
+IMPLEMENT_ABSTRACT_CLASS(wxMemoryInputStream, wxInputStream)
+
+wxMemoryInputStream::wxMemoryInputStream(const void *data, size_t len)
+{
+ 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;
+}
+
+wxMemoryInputStream::wxMemoryInputStream(const wxMemoryOutputStream& stream)
+{
+ 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;
+}
+
+void
+wxMemoryInputStream::InitFromStream(wxInputStream& stream, wxFileOffset lenFile)
{
- m_i_streambuf = new wxStreamBuffer(wxStreamBuffer::read);
- m_i_streambuf->SetBufferIO((char*) data, (char*) (data+len));
- m_i_streambuf->SetIntPosition(0); // seek to start pos
- m_i_streambuf->Fixed(TRUE);
+ if ( lenFile == wxInvalidOffset )
+ 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( (wxFileOffset)len == lenFile, wxT("huge files not supported") );
+
+ 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();
+}
- m_length = len;
+bool wxMemoryInputStream::CanRead() const
+{
+ return m_i_streambuf->GetIntPosition() != m_length;
}
wxMemoryInputStream::~wxMemoryInputStream()
{
- delete m_i_streambuf;
+ delete m_i_streambuf;
}
char wxMemoryInputStream::Peek()
{
- return m_i_streambuf->GetBufferStart()[m_i_streambuf->GetIntPosition()];
+ char *buf = (char *)m_i_streambuf->GetBufferStart();
+ size_t pos = m_i_streambuf->GetIntPosition();
+ if ( pos == m_length )
+ {
+ m_lasterror = wxSTREAM_READ_ERROR;
+
+ return 0;
+ }
+
+ return buf[pos];
}
size_t wxMemoryInputStream::OnSysRead(void *buffer, size_t nbytes)
-{
- size_t bufsize = m_i_streambuf->GetBufferEnd() - m_i_streambuf->GetBufferStart();
- size_t oldpos = m_i_streambuf->GetIntPosition();
- m_i_streambuf->Read(buffer, nbytes);
- size_t newpos = m_i_streambuf->GetIntPosition();
- if (newpos == 0) return bufsize - oldpos;
- else return newpos - oldpos;
+{
+ size_t pos = m_i_streambuf->GetIntPosition();
+ if ( pos == m_length )
+ {
+ m_lasterror = wxSTREAM_EOF;
+
+ return 0;
+ }
+
+ m_i_streambuf->Read(buffer, nbytes);
+ m_lasterror = wxSTREAM_NO_ERROR;
+
+ return m_i_streambuf->GetIntPosition() - pos;
}
-off_t wxMemoryInputStream::OnSysSeek(off_t pos, wxSeekMode mode)
+wxFileOffset wxMemoryInputStream::OnSysSeek(wxFileOffset pos, wxSeekMode mode)
{
- return m_i_streambuf->Seek(pos, mode);
+ return m_i_streambuf->Seek(pos, mode);
}
-off_t wxMemoryInputStream::OnSysTell() const
+wxFileOffset wxMemoryInputStream::OnSysTell() const
{
- return m_i_streambuf->Tell();
+ return m_i_streambuf->Tell();
}
// ----------------------------------------------------------------------------
// wxMemoryOutputStream
// ----------------------------------------------------------------------------
-wxMemoryOutputStream::wxMemoryOutputStream(char *data, size_t len)
- : wxOutputStream()
+IMPLEMENT_DYNAMIC_CLASS(wxMemoryOutputStream, wxOutputStream)
+
+wxMemoryOutputStream::wxMemoryOutputStream(void *data, size_t len)
{
- m_o_streambuf = new wxStreamBuffer(wxStreamBuffer::write);
- if (data)
- m_o_streambuf->SetBufferIO(data, data+len);
- m_o_streambuf->Fixed(FALSE);
- m_o_streambuf->Flushable(FALSE);
+ 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);
}
wxMemoryOutputStream::~wxMemoryOutputStream()
{
- delete m_o_streambuf;
+ delete m_o_streambuf;
}
size_t wxMemoryOutputStream::OnSysWrite(const void *buffer, size_t nbytes)
{
- size_t bufsize = m_o_streambuf->GetBufferEnd() - m_o_streambuf->GetBufferStart();
- size_t oldpos = m_o_streambuf->GetIntPosition();
- m_o_streambuf->Write(buffer, nbytes);
- size_t newpos = m_o_streambuf->GetIntPosition();
- if (newpos == 0) return bufsize - oldpos;
- else return newpos - oldpos;
+ size_t oldpos = m_o_streambuf->GetIntPosition();
+ m_o_streambuf->Write(buffer, nbytes);
+ size_t newpos = m_o_streambuf->GetIntPosition();
+
+ // FIXME can someone please explain what this does? (VZ)
+ if ( !newpos )
+ newpos = m_o_streambuf->GetBufferSize();
+
+ return newpos - oldpos;
}
-off_t wxMemoryOutputStream::OnSysSeek(off_t pos, wxSeekMode mode)
+wxFileOffset wxMemoryOutputStream::OnSysSeek(wxFileOffset pos, wxSeekMode mode)
{
- return m_o_streambuf->Seek(pos, mode);
+ return m_o_streambuf->Seek(pos, mode);
}
-off_t wxMemoryOutputStream::OnSysTell() const
+wxFileOffset wxMemoryOutputStream::OnSysTell() const
{
- return m_o_streambuf->Tell();
+ return m_o_streambuf->Tell();
}
-size_t wxMemoryOutputStream::CopyTo(char *buffer, size_t len) const
+size_t wxMemoryOutputStream::CopyTo(void *buffer, size_t len) const
{
- if (!buffer)
- return 0;
+ wxCHECK_MSG( buffer, 0, wxT("must have buffer to CopyTo") );
+
+ if ( len > GetSize() )
+ len = GetSize();
- if (len > GetSize())
- len = GetSize();
+ memcpy(buffer, m_o_streambuf->GetBufferStart(), len);
- memcpy(buffer, m_o_streambuf->GetBufferStart(), len);
- return len;
+ return len;
}
-#endif
+#endif // wxUSE_STREAMS
projects / wxWidgets.git / blobdiff