/////////////////////////////////////////////////////////////////////////////
-// 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"
-#include <stdlib.h>
-#include <wx/stream.h>
-#include <wx/mstream.h>
#ifdef __BORLANDC__
-#pragma hdrstop
+ #pragma hdrstop
#endif
+#if wxUSE_STREAMS
+
+#include "wx/mstream.h"
+
+#ifndef WX_PRECOMP
+ #include "wx/stream.h"
+#endif //WX_PRECOMP
+
+#include <stdlib.h>
+
+// ============================================================================
+// implementation
+// ============================================================================
+
// ----------------------------------------------------------------------------
-// wxMemoryStreamBase
+// wxMemoryInputStream
// ----------------------------------------------------------------------------
-wxMemoryStreamBase::wxMemoryStreamBase()
+
+IMPLEMENT_ABSTRACT_CLASS(wxMemoryInputStream, wxInputStream)
+
+wxMemoryInputStream::wxMemoryInputStream(const void *data, size_t len)
{
- m_buffer = NULL;
- m_iolimit = 0;
- m_persistent = FALSE;
- m_length = 0;
+ m_i_streambuf = new wxStreamBuffer(wxStreamBuffer::read);
+ m_i_streambuf->SetBufferIO((void *)data, len); // const_cast
+ m_i_streambuf->SetIntPosition(0); // seek to start pos
+ m_i_streambuf->Fixed(true);
+
+ m_length = len;
}
-wxMemoryStreamBase::~wxMemoryStreamBase()
+wxMemoryInputStream::wxMemoryInputStream(const wxMemoryOutputStream& stream)
{
- if (!m_persistent && m_buffer)
- free(m_buffer);
+ 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), _T("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;
}
-bool wxMemoryStreamBase::ChangeBufferSize(size_t new_size)
+void
+wxMemoryInputStream::InitFromStream(wxInputStream& stream, wxFileOffset lenFile)
{
- if (m_iolimit == 1)
- return FALSE;
+ if ( lenFile == wxInvalidOffset )
+ lenFile = stream.GetLength();
+
+ if ( lenFile == wxInvalidOffset )
+ {
+ m_i_streambuf = NULL;
+ m_lasterror = wxSTREAM_EOF;
+ return;
+ }
- m_length = new_size;
- if (!m_buffer)
- m_buffer = (char *)malloc(m_length);
- else
- m_buffer = (char *)realloc(m_buffer, m_length);
+ const size_t len = wx_truncate_cast(size_t, lenFile);
+ wxASSERT_MSG( (wxFileOffset)len == lenFile, _T("huge files not supported") );
- return (m_buffer != NULL);
+ 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();
}
-// ----------------------------------------------------------------------------
-// wxMemoryInputStream
-// ----------------------------------------------------------------------------
-
-wxMemoryInputStream::wxMemoryInputStream(const char *data, size_t len)
+bool wxMemoryInputStream::CanRead() const
{
- m_persistent = TRUE;
- m_length = len;
- m_buffer = (char *)data; // It's bad.
- m_position_i = 0;
- m_lastread = 0;
- m_eof = FALSE;
- m_iolimit = 1;
-
- m_i_streambuf->SetBufferIO(0);
+ return m_i_streambuf->GetIntPosition() != m_length;
}
wxMemoryInputStream::~wxMemoryInputStream()
{
+ delete m_i_streambuf;
}
-size_t wxMemoryInputStream::DoRead(void *buffer, size_t size)
+char wxMemoryInputStream::Peek()
{
- if (m_iolimit == 2) {
- m_eof = TRUE;
- return 0;
- }
- if (m_position_i+size > m_length)
- size = m_length-m_position_i;
+ char *buf = (char *)m_i_streambuf->GetBufferStart();
+ size_t pos = m_i_streambuf->GetIntPosition();
+ if ( pos == m_length )
+ {
+ m_lasterror = wxSTREAM_READ_ERROR;
- memcpy((void *)((unsigned long)buffer+m_position_i), m_buffer, size);
- m_position_i += size;
+ return 0;
+ }
- return size;
+ return buf[pos];
}
-off_t wxMemoryInputStream::DoSeekInput(off_t pos, wxSeekMode mode)
+size_t wxMemoryInputStream::OnSysRead(void *buffer, size_t nbytes)
{
- if (m_iolimit == 2)
- return 0;
-
- switch (mode) {
- case wxFromStart:
- if ((size_t)pos > m_length)
- return m_position_i;
- return (m_position_i = pos);
+ size_t pos = m_i_streambuf->GetIntPosition();
+ if ( pos == m_length )
+ {
+ m_lasterror = wxSTREAM_EOF;
- case wxFromCurrent:
- if ((size_t)(m_position_i+pos) > m_length)
- return m_position_i;
+ return 0;
+ }
- return (m_position_i += pos);
+ m_i_streambuf->Read(buffer, nbytes);
+ m_lasterror = wxSTREAM_NO_ERROR;
- case wxFromEnd:
- if ((size_t)(m_length-pos) > m_length)
- return m_position_i;
+ return m_i_streambuf->GetIntPosition() - pos;
+}
- return (m_position_i = m_length-pos);
- }
+wxFileOffset wxMemoryInputStream::OnSysSeek(wxFileOffset pos, wxSeekMode mode)
+{
+ return m_i_streambuf->Seek(pos, mode);
+}
- return m_position_i;
+wxFileOffset wxMemoryInputStream::OnSysTell() const
+{
+ return m_i_streambuf->Tell();
}
// ----------------------------------------------------------------------------
// wxMemoryOutputStream
// ----------------------------------------------------------------------------
-wxMemoryOutputStream::wxMemoryOutputStream(char *data, size_t len)
+IMPLEMENT_DYNAMIC_CLASS(wxMemoryOutputStream, wxOutputStream)
+
+wxMemoryOutputStream::wxMemoryOutputStream(void *data, size_t len)
{
- m_persistent = FALSE;
- m_buffer = data;
- m_length = len;
- m_position_o = 0;
- m_lastwrite = 0;
- m_bad = FALSE;
- m_iolimit = 2;
-
- m_o_streambuf->SetBufferIO(0);
+ 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()
{
- Sync();
+ delete m_o_streambuf;
}
-size_t wxMemoryOutputStream::DoWrite(const void *buffer, size_t size)
+size_t wxMemoryOutputStream::OnSysWrite(const void *buffer, size_t nbytes)
{
- if (m_iolimit == 1) {
- m_bad = TRUE;
- return 0;
- }
-
- if (m_position_o+size > m_length)
- if (!ChangeBufferSize(m_position_o+size)) {
- m_bad = TRUE;
- return 0;
- }
+ size_t oldpos = m_o_streambuf->GetIntPosition();
+ m_o_streambuf->Write(buffer, nbytes);
+ size_t newpos = m_o_streambuf->GetIntPosition();
- memcpy(m_buffer+m_position_o, buffer, size);
- m_position_o += size;
+ // FIXME can someone please explain what this does? (VZ)
+ if ( !newpos )
+ newpos = m_o_streambuf->GetBufferSize();
- return size;
+ return newpos - oldpos;
}
-off_t wxMemoryOutputStream::DoSeekOutput(off_t pos, wxSeekMode mode)
+wxFileOffset wxMemoryOutputStream::OnSysSeek(wxFileOffset pos, wxSeekMode mode)
{
- if (m_iolimit == 1)
- return 0;
-
- switch (mode) {
- case wxFromStart:
- if ((size_t)pos > m_length)
- return m_position_o;
- return (m_position_o = pos);
-
- case wxFromCurrent:
- if ((size_t)(m_position_o+pos) > m_length)
- return m_position_o;
-
- return (m_position_o += pos);
-
- case wxFromEnd:
- if ((size_t)(m_length-pos) > m_length)
- return m_position_o;
-
- return (m_position_o = m_length-pos);
- }
-
- return m_position_o;
+ return m_o_streambuf->Seek(pos, mode);
}
-// ----------------------------------------------------------------------------
-// wxMemoryStream
-// ----------------------------------------------------------------------------
-
-wxMemoryStream::wxMemoryStream(char *data, size_t len)
- : wxMemoryInputStream(NULL, 0), wxMemoryOutputStream(NULL, 0)
+wxFileOffset wxMemoryOutputStream::OnSysTell() const
{
- m_persistent = FALSE;
- m_buffer = data;
- m_length = len;
- m_iolimit = 0;
+ return m_o_streambuf->Tell();
}
-wxMemoryStream::~wxMemoryStream()
+size_t wxMemoryOutputStream::CopyTo(void *buffer, size_t len) const
{
+ wxCHECK_MSG( buffer, 0, _T("must have buffer to CopyTo") );
+
+ if ( len > GetSize() )
+ len = GetSize();
+
+ memcpy(buffer, m_o_streambuf->GetBufferStart(), len);
+
+ return len;
}
+
+#endif // wxUSE_STREAMS
projects / wxWidgets.git / blobdiff