2008-12-08 06:17:03 +01:00
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/////////////////////////////////////////////////////////////////////////////
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// Name: src/common/mstream.cpp
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// Purpose: "Memory stream" classes
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// Author: Guilhem Lavaux
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// Modified by: VZ (23.11.00): general code review
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// Created: 04/01/98
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// RCS-ID: $Id: mstream.cpp 39001 2006-05-03 21:50:35Z ABX $
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// Copyright: (c) Guilhem Lavaux
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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// ============================================================================
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// declarations
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// ============================================================================
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// ----------------------------------------------------------------------------
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// headers
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// ----------------------------------------------------------------------------
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// For compilers that support precompilation, includes "wx.h".
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#include "wx/wxprec.h"
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#ifdef __BORLANDC__
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#pragma hdrstop
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#endif
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#if wxUSE_STREAMS
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#include "wx/mstream.h"
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#ifndef WX_PRECOMP
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#include "wx/stream.h"
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#endif //WX_PRECOMP
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#include <stdlib.h>
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// ============================================================================
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// implementation
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// ============================================================================
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// ----------------------------------------------------------------------------
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// wxMemoryInputStream
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// ----------------------------------------------------------------------------
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wxMemoryInputStream::wxMemoryInputStream(const void *data, size_t len)
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{
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m_i_streambuf = new wxStreamBuffer(wxStreamBuffer::read);
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m_i_streambuf->SetBufferIO((void *)data, len); // const_cast
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m_i_streambuf->SetIntPosition(0); // seek to start pos
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m_i_streambuf->Fixed(true);
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m_length = len;
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}
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wxMemoryInputStream::wxMemoryInputStream(const wxMemoryOutputStream& stream)
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{
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const wxFileOffset lenFile = stream.GetLength();
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if ( lenFile == wxInvalidOffset )
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{
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m_i_streambuf = NULL;
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m_lasterror = wxSTREAM_EOF;
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return;
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}
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const size_t len = wx_truncate_cast(size_t, lenFile);
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wxASSERT_MSG( len == lenFile + size_t(0), _T("huge files not supported") );
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m_i_streambuf = new wxStreamBuffer(wxStreamBuffer::read);
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m_i_streambuf->SetBufferIO(len); // create buffer
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stream.CopyTo(m_i_streambuf->GetBufferStart(), len);
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m_i_streambuf->SetIntPosition(0); // seek to start pos
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m_i_streambuf->Fixed(true);
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m_length = len;
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}
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wxMemoryInputStream::~wxMemoryInputStream()
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{
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delete m_i_streambuf;
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}
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char wxMemoryInputStream::Peek()
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{
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char *buf = (char *)m_i_streambuf->GetBufferStart();
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size_t pos = m_i_streambuf->GetIntPosition();
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if ( pos == m_length )
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{
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m_lasterror = wxSTREAM_READ_ERROR;
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return 0;
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}
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return buf[pos];
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}
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size_t wxMemoryInputStream::OnSysRead(void *buffer, size_t nbytes)
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{
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size_t pos = m_i_streambuf->GetIntPosition();
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if ( pos == m_length )
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{
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m_lasterror = wxSTREAM_EOF;
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return 0;
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}
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m_i_streambuf->Read(buffer, nbytes);
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m_lasterror = wxSTREAM_NO_ERROR;
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return m_i_streambuf->GetIntPosition() - pos;
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}
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wxFileOffset wxMemoryInputStream::OnSysSeek(wxFileOffset pos, wxSeekMode mode)
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{
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return m_i_streambuf->Seek(pos, mode);
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}
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wxFileOffset wxMemoryInputStream::OnSysTell() const
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{
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return m_i_streambuf->Tell();
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}
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// ----------------------------------------------------------------------------
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// wxMemoryOutputStream
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// ----------------------------------------------------------------------------
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wxMemoryOutputStream::wxMemoryOutputStream(void *data, size_t len)
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{
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m_o_streambuf = new wxStreamBuffer(wxStreamBuffer::write);
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if ( data )
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m_o_streambuf->SetBufferIO(data, len);
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m_o_streambuf->Fixed(false);
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m_o_streambuf->Flushable(false);
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}
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wxMemoryOutputStream::~wxMemoryOutputStream()
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{
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delete m_o_streambuf;
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}
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size_t wxMemoryOutputStream::OnSysWrite(const void *buffer, size_t nbytes)
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{
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size_t oldpos = m_o_streambuf->GetIntPosition();
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m_o_streambuf->Write(buffer, nbytes);
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size_t newpos = m_o_streambuf->GetIntPosition();
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// FIXME can someone please explain what this does? (VZ)
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if ( !newpos )
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newpos = m_o_streambuf->GetBufferSize();
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return newpos - oldpos;
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}
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wxFileOffset wxMemoryOutputStream::OnSysSeek(wxFileOffset pos, wxSeekMode mode)
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{
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return m_o_streambuf->Seek(pos, mode);
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}
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wxFileOffset wxMemoryOutputStream::OnSysTell() const
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{
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return m_o_streambuf->Tell();
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}
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size_t wxMemoryOutputStream::CopyTo(void *buffer, size_t len) const
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{
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wxCHECK_MSG( buffer, 0, _T("must have buffer to CopyTo") );
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if ( len > GetSize() )
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len = GetSize();
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memcpy(buffer, m_o_streambuf->GetBufferStart(), len);
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return len;
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}
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#endif // wxUSE_STREAMS
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