1 /////////////////////////////////////////////////////////////////////////////
3 // Purpose: "Memory stream" classes
4 // Author: Guilhem Lavaux
8 // Copyright: (c) Guilhem Lavaux
9 // Licence: wxWindows license
10 /////////////////////////////////////////////////////////////////////////////
13 #pragma implementation "mstream.h"
16 // For compilers that support precompilation, includes "wx.h".
17 #include "wx/wxprec.h"
26 #include "wx/stream.h"
27 #include "wx/mstream.h"
29 // ----------------------------------------------------------------------------
30 // wxMemoryInputStream
31 // ----------------------------------------------------------------------------
33 wxMemoryInputStream
::wxMemoryInputStream(const char *data
, size_t len
)
36 m_i_streambuf
= new wxStreamBuffer(wxStreamBuffer
::read
);
37 m_i_streambuf
->SetBufferIO((char*) data
, (char*) (data
+len
));
38 m_i_streambuf
->SetIntPosition(0); // seek to start pos
39 m_i_streambuf
->Fixed(TRUE
);
44 wxMemoryInputStream
::~wxMemoryInputStream()
49 char wxMemoryInputStream
::Peek()
51 return m_i_streambuf
->GetBufferStart()[m_i_streambuf
->GetIntPosition()];
54 size_t wxMemoryInputStream
::OnSysRead(void *buffer
, size_t nbytes
)
56 size_t bufsize
= m_i_streambuf
->GetBufferEnd() - m_i_streambuf
->GetBufferStart();
57 size_t oldpos
= m_i_streambuf
->GetIntPosition();
58 m_i_streambuf
->Read(buffer
, nbytes
);
59 size_t newpos
= m_i_streambuf
->GetIntPosition();
60 if (newpos
== 0) return bufsize
- oldpos
;
61 else return newpos
- oldpos
;
64 off_t wxMemoryInputStream
::OnSysSeek(off_t pos
, wxSeekMode mode
)
66 return m_i_streambuf
->Seek(pos
, mode
);
69 off_t wxMemoryInputStream
::OnSysTell() const
71 return m_i_streambuf
->Tell();
74 // ----------------------------------------------------------------------------
75 // wxMemoryOutputStream
76 // ----------------------------------------------------------------------------
78 wxMemoryOutputStream
::wxMemoryOutputStream(char *data
, size_t len
)
81 m_o_streambuf
= new wxStreamBuffer(wxStreamBuffer
::write
);
83 m_o_streambuf
->SetBufferIO(data
, data
+len
);
84 m_o_streambuf
->Fixed(FALSE
);
85 m_o_streambuf
->Flushable(FALSE
);
88 wxMemoryOutputStream
::~wxMemoryOutputStream()
93 size_t wxMemoryOutputStream
::OnSysWrite(const void *buffer
, size_t nbytes
)
95 size_t bufsize
= m_o_streambuf
->GetBufferEnd() - m_o_streambuf
->GetBufferStart();
96 size_t oldpos
= m_o_streambuf
->GetIntPosition();
97 m_o_streambuf
->Write(buffer
, nbytes
);
98 size_t newpos
= m_o_streambuf
->GetIntPosition();
99 if (newpos
== 0) return bufsize
- oldpos
;
100 else return newpos
- oldpos
;
103 off_t wxMemoryOutputStream
::OnSysSeek(off_t pos
, wxSeekMode mode
)
105 return m_o_streambuf
->Seek(pos
, mode
);
108 off_t wxMemoryOutputStream
::OnSysTell() const
110 return m_o_streambuf
->Tell();
113 size_t wxMemoryOutputStream
::CopyTo(char *buffer
, size_t len
) const
121 memcpy(buffer
, m_o_streambuf
->GetBufferStart(), len
);