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3d4c6a21 | 1 | ///////////////////////////////////////////////////////////////////////////// |
67c8c225 | 2 | // Name: src/common/mstream.cpp |
3d4c6a21 GL |
3 | // Purpose: "Memory stream" classes |
4 | // Author: Guilhem Lavaux | |
67c8c225 | 5 | // Modified by: VZ (23.11.00): general code review |
3d4c6a21 GL |
6 | // Created: 04/01/98 |
7 | // RCS-ID: $Id$ | |
8 | // Copyright: (c) Guilhem Lavaux | |
9 | // Licence: wxWindows license | |
10 | ///////////////////////////////////////////////////////////////////////////// | |
11 | ||
67c8c225 VZ |
12 | // ============================================================================ |
13 | // declarations | |
14 | // ============================================================================ | |
15 | ||
16 | // ---------------------------------------------------------------------------- | |
17 | // headers | |
18 | // ---------------------------------------------------------------------------- | |
19 | ||
3d4c6a21 | 20 | #ifdef __GNUG__ |
32fc4afb | 21 | #pragma implementation "mstream.h" |
3d4c6a21 GL |
22 | #endif |
23 | ||
79c3e0e1 GL |
24 | // For compilers that support precompilation, includes "wx.h". |
25 | #include "wx/wxprec.h" | |
79c3e0e1 GL |
26 | |
27 | #ifdef __BORLANDC__ | |
ce4169a4 | 28 | #pragma hdrstop |
79c3e0e1 | 29 | #endif |
3d4c6a21 | 30 | |
ce4169a4 RR |
31 | #if wxUSE_STREAMS |
32 | ||
33 | #include <stdlib.h> | |
3096bd2f VZ |
34 | #include "wx/stream.h" |
35 | #include "wx/mstream.h" | |
ce4169a4 | 36 | |
67c8c225 VZ |
37 | // ============================================================================ |
38 | // implementation | |
39 | // ============================================================================ | |
40 | ||
79c3e0e1 GL |
41 | // ---------------------------------------------------------------------------- |
42 | // wxMemoryInputStream | |
43 | // ---------------------------------------------------------------------------- | |
44 | ||
67c8c225 | 45 | wxMemoryInputStream::wxMemoryInputStream(const void *data, size_t len) |
79c3e0e1 | 46 | { |
67c8c225 VZ |
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); | |
c980c992 | 51 | |
67c8c225 | 52 | m_length = len; |
3d4c6a21 GL |
53 | } |
54 | ||
0cd9bfe8 GL |
55 | wxMemoryInputStream::~wxMemoryInputStream() |
56 | { | |
67c8c225 | 57 | delete m_i_streambuf; |
0cd9bfe8 GL |
58 | } |
59 | ||
32a4b1d5 GL |
60 | char wxMemoryInputStream::Peek() |
61 | { | |
67c8c225 VZ |
62 | char *buf = (char *)m_i_streambuf->GetBufferStart(); |
63 | ||
64 | return buf[m_i_streambuf->GetIntPosition()]; | |
c980c992 GL |
65 | } |
66 | ||
83141d3a VZ |
67 | bool wxMemoryInputStream::Eof() const |
68 | { | |
67c8c225 | 69 | return !m_i_streambuf->GetBytesLeft(); |
83141d3a VZ |
70 | } |
71 | ||
c980c992 | 72 | size_t wxMemoryInputStream::OnSysRead(void *buffer, size_t nbytes) |
83141d3a VZ |
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; | |
c980c992 GL |
86 | } |
87 | ||
88 | off_t wxMemoryInputStream::OnSysSeek(off_t pos, wxSeekMode mode) | |
89 | { | |
67c8c225 | 90 | return m_i_streambuf->Seek(pos, mode); |
c980c992 GL |
91 | } |
92 | ||
93 | off_t wxMemoryInputStream::OnSysTell() const | |
94 | { | |
67c8c225 | 95 | return m_i_streambuf->Tell(); |
3d4c6a21 GL |
96 | } |
97 | ||
79c3e0e1 GL |
98 | // ---------------------------------------------------------------------------- |
99 | // wxMemoryOutputStream | |
100 | // ---------------------------------------------------------------------------- | |
101 | ||
67c8c225 | 102 | wxMemoryOutputStream::wxMemoryOutputStream(void *data, size_t len) |
79c3e0e1 | 103 | { |
67c8c225 VZ |
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); | |
79c3e0e1 GL |
109 | } |
110 | ||
0cd9bfe8 | 111 | wxMemoryOutputStream::~wxMemoryOutputStream() |
79c3e0e1 | 112 | { |
67c8c225 | 113 | delete m_o_streambuf; |
3d4c6a21 | 114 | } |
ce4169a4 | 115 | |
c980c992 GL |
116 | size_t wxMemoryOutputStream::OnSysWrite(const void *buffer, size_t nbytes) |
117 | { | |
67c8c225 VZ |
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; | |
c980c992 GL |
127 | } |
128 | ||
129 | off_t wxMemoryOutputStream::OnSysSeek(off_t pos, wxSeekMode mode) | |
130 | { | |
67c8c225 | 131 | return m_o_streambuf->Seek(pos, mode); |
c980c992 GL |
132 | } |
133 | ||
134 | off_t wxMemoryOutputStream::OnSysTell() const | |
135 | { | |
67c8c225 | 136 | return m_o_streambuf->Tell(); |
c980c992 GL |
137 | } |
138 | ||
67c8c225 | 139 | size_t wxMemoryOutputStream::CopyTo(void *buffer, size_t len) const |
a324a7bc | 140 | { |
67c8c225 | 141 | wxCHECK_MSG( buffer, 0, _T("must have buffer to CopyTo") ); |
a324a7bc | 142 | |
67c8c225 VZ |
143 | if ( len > GetSize() ) |
144 | len = GetSize(); | |
a324a7bc | 145 | |
67c8c225 VZ |
146 | memcpy(buffer, m_o_streambuf->GetBufferStart(), len); |
147 | ||
148 | return len; | |
a324a7bc | 149 | } |
c980c992 | 150 | |
67c8c225 | 151 | #endif // wxUSE_STREAMS |