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1 /////////////////////////////////////////////////////////////////////////////
2 // Name: src/common/mstream.cpp
3 // Purpose: "Memory stream" classes
4 // Author: Guilhem Lavaux
5 // Modified by: VZ (23.11.00): general code review
6 // Created: 04/01/98
7 // RCS-ID: $Id$
8 // Copyright: (c) Guilhem Lavaux
9 // Licence: wxWindows license
10 /////////////////////////////////////////////////////////////////////////////
11
12 // ============================================================================
13 // declarations
14 // ============================================================================
15
16 // ----------------------------------------------------------------------------
17 // headers
18 // ----------------------------------------------------------------------------
19
20 #ifdef __GNUG__
21 #pragma implementation "mstream.h"
22 #endif
23
24 // For compilers that support precompilation, includes "wx.h".
25 #include "wx/wxprec.h"
26
27 #ifdef __BORLANDC__
28 #pragma hdrstop
29 #endif
30
31 #if wxUSE_STREAMS
32
33 #include <stdlib.h>
34 #include "wx/stream.h"
35 #include "wx/mstream.h"
36
37 // ============================================================================
38 // implementation
39 // ============================================================================
40
41 // ----------------------------------------------------------------------------
42 // wxMemoryInputStream
43 // ----------------------------------------------------------------------------
44
45 wxMemoryInputStream::wxMemoryInputStream(const void *data, size_t len)
46 {
47 m_i_streambuf = new wxStreamBuffer(wxStreamBuffer::read);
48 m_i_streambuf->SetBufferIO((void *)data, len); // const_cast
49 m_i_streambuf->SetIntPosition(0); // seek to start pos
50 m_i_streambuf->Fixed(TRUE);
51
52 m_length = len;
53 }
54
55 wxMemoryInputStream::~wxMemoryInputStream()
56 {
57 delete m_i_streambuf;
58 }
59
60 char wxMemoryInputStream::Peek()
61 {
62 char *buf = (char *)m_i_streambuf->GetBufferStart();
63
64 return buf[m_i_streambuf->GetIntPosition()];
65 }
66
67 bool wxMemoryInputStream::Eof() const
68 {
69 return !m_i_streambuf->GetBytesLeft();
70 }
71
72 size_t wxMemoryInputStream::OnSysRead(void *buffer, size_t nbytes)
73 {
74 size_t pos = m_i_streambuf->GetIntPosition();
75 if ( pos == m_length )
76 {
77 m_lasterror = wxSTREAM_EOF;
78
79 return 0;
80 }
81
82 m_i_streambuf->Read(buffer, nbytes);
83 m_lasterror = wxSTREAM_NOERROR;
84
85 return m_i_streambuf->GetIntPosition() - pos;
86 }
87
88 off_t wxMemoryInputStream::OnSysSeek(off_t pos, wxSeekMode mode)
89 {
90 return m_i_streambuf->Seek(pos, mode);
91 }
92
93 off_t wxMemoryInputStream::OnSysTell() const
94 {
95 return m_i_streambuf->Tell();
96 }
97
98 // ----------------------------------------------------------------------------
99 // wxMemoryOutputStream
100 // ----------------------------------------------------------------------------
101
102 wxMemoryOutputStream::wxMemoryOutputStream(void *data, size_t len)
103 {
104 m_o_streambuf = new wxStreamBuffer(wxStreamBuffer::write);
105 if ( data )
106 m_o_streambuf->SetBufferIO(data, len);
107 m_o_streambuf->Fixed(FALSE);
108 m_o_streambuf->Flushable(FALSE);
109 }
110
111 wxMemoryOutputStream::~wxMemoryOutputStream()
112 {
113 delete m_o_streambuf;
114 }
115
116 size_t wxMemoryOutputStream::OnSysWrite(const void *buffer, size_t nbytes)
117 {
118 size_t oldpos = m_o_streambuf->GetIntPosition();
119 m_o_streambuf->Write(buffer, nbytes);
120 size_t newpos = m_o_streambuf->GetIntPosition();
121
122 // FIXME can someone please explain what this does? (VZ)
123 if ( !newpos )
124 newpos = m_o_streambuf->GetBufferSize();
125
126 return newpos - oldpos;
127 }
128
129 off_t wxMemoryOutputStream::OnSysSeek(off_t pos, wxSeekMode mode)
130 {
131 return m_o_streambuf->Seek(pos, mode);
132 }
133
134 off_t wxMemoryOutputStream::OnSysTell() const
135 {
136 return m_o_streambuf->Tell();
137 }
138
139 size_t wxMemoryOutputStream::CopyTo(void *buffer, size_t len) const
140 {
141 wxCHECK_MSG( buffer, 0, _T("must have buffer to CopyTo") );
142
143 if ( len > GetSize() )
144 len = GetSize();
145
146 memcpy(buffer, m_o_streambuf->GetBufferStart(), len);
147
148 return len;
149 }
150
151 #endif // wxUSE_STREAMS