/////////////////////////////////////////////////////////////////////////////
-// 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"
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
+// For compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
+
+#ifdef __BORLANDC__
+ #pragma hdrstop
#endif
+#if wxUSE_STREAMS
+
+#include "wx/mstream.h"
+
+#ifndef WX_PRECOMP
+ #include "wx/stream.h"
+#endif //WX_PRECOMP
+
#include <stdlib.h>
-#include <wx/stream.h>
-#include <wx/mstream.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
projects / wxWidgets.git / blobdiff