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121fa06a VZ |
1 | /////////////////////////////////////////////////////////////////////////////// |
2 | // Name: common/sstream.cpp | |
3 | // Purpose: string-based streams implementation | |
4 | // Author: Vadim Zeitlin | |
5 | // Modified by: | |
6 | // Created: 2004-09-19 | |
7 | // RCS-ID: $Id$ | |
8 | // Copyright: (c) 2004 Vadim Zeitlin <vadim@wxwindows.org> | |
9 | // Licence: wxWindows licence | |
10 | /////////////////////////////////////////////////////////////////////////////// | |
11 | ||
12 | // ============================================================================ | |
13 | // declarations | |
14 | // ============================================================================ | |
15 | ||
16 | // ---------------------------------------------------------------------------- | |
17 | // headers | |
18 | // ---------------------------------------------------------------------------- | |
19 | ||
20 | // For compilers that support precompilation, includes "wx.h". | |
21 | #include "wx/wxprec.h" | |
22 | ||
23 | #ifdef __BORLANDC__ | |
24 | #pragma hdrstop | |
25 | #endif | |
26 | ||
27 | #if wxUSE_STREAMS | |
28 | ||
29 | #include "wx/sstream.h" | |
30 | ||
31 | // ============================================================================ | |
32 | // wxStringInputStream implementation | |
33 | // ============================================================================ | |
34 | ||
35 | // ---------------------------------------------------------------------------- | |
36 | // seek/tell | |
37 | // ---------------------------------------------------------------------------- | |
38 | ||
39 | off_t wxStringInputStream::OnSysSeek(off_t ofs, wxSeekMode mode) | |
40 | { | |
5a4c7f71 VZ |
41 | const size_t ofsMax = m_str.length()*sizeof(wxChar); |
42 | ||
121fa06a VZ |
43 | switch ( mode ) |
44 | { | |
45 | case wxFromStart: | |
46 | // nothing to do, ofs already ok | |
47 | break; | |
48 | ||
49 | case wxFromEnd: | |
5a4c7f71 | 50 | ofs += ofsMax; |
121fa06a VZ |
51 | break; |
52 | ||
53 | case wxFromCurrent: | |
54 | ofs += m_pos; | |
55 | break; | |
56 | ||
57 | default: | |
58 | wxFAIL_MSG( _T("invalid seek mode") ); | |
59 | return wxInvalidOffset; | |
60 | } | |
61 | ||
5a4c7f71 VZ |
62 | if ( ofs < 0 || wx_static_cast(size_t, ofs) >= ofsMax ) |
63 | return wxInvalidOffset; | |
64 | ||
121fa06a VZ |
65 | m_pos = wx_static_cast(size_t, ofs); |
66 | ||
67 | return ofs; | |
68 | } | |
69 | ||
70 | off_t wxStringInputStream::OnSysTell() const | |
71 | { | |
72 | return wx_static_cast(off_t, m_pos); | |
73 | } | |
74 | ||
75 | // ---------------------------------------------------------------------------- | |
76 | // actual IO | |
77 | // ---------------------------------------------------------------------------- | |
78 | ||
79 | size_t wxStringInputStream::OnSysRead(void *buffer, size_t size) | |
80 | { | |
81 | const size_t sizeMax = m_str.length()*sizeof(wxChar) - m_pos; | |
82 | ||
83 | if ( size >= sizeMax ) | |
84 | { | |
85 | if ( sizeMax == 0 ) | |
86 | { | |
87 | m_lasterror = wxSTREAM_EOF; | |
88 | return 0; | |
89 | } | |
90 | ||
91 | size = sizeMax; | |
92 | } | |
93 | ||
94 | memcpy(buffer, m_str.data() + m_pos, size); | |
95 | m_pos += size; | |
96 | ||
97 | return size; | |
98 | } | |
99 | ||
100 | // ============================================================================ | |
101 | // wxStringOutputStream implementation | |
102 | // ============================================================================ | |
103 | ||
a5ea75bc VZ |
104 | // ---------------------------------------------------------------------------- |
105 | // seek/tell | |
106 | // ---------------------------------------------------------------------------- | |
107 | ||
108 | off_t wxStringOutputStream::OnSysTell() const | |
109 | { | |
110 | return wx_static_cast(off_t, m_pos); | |
111 | } | |
112 | ||
121fa06a VZ |
113 | // ---------------------------------------------------------------------------- |
114 | // actual IO | |
115 | // ---------------------------------------------------------------------------- | |
116 | ||
117 | size_t wxStringOutputStream::OnSysWrite(const void *buffer, size_t size) | |
118 | { | |
119 | // in Unicode mode we might not be able to write the last byte | |
120 | size_t len = size / sizeof(wxChar); | |
121 | ||
122 | const wxChar *p = wx_static_cast(const wxChar *, buffer); | |
123 | ||
a5ea75bc | 124 | m_str->Append(wxString(p, p + len)); |
121fa06a VZ |
125 | |
126 | // return number of bytes actually written | |
a5ea75bc VZ |
127 | len *= sizeof(wxChar); |
128 | m_pos += len; | |
129 | ||
130 | return len; | |
121fa06a VZ |
131 | } |
132 | ||
133 | #endif // wxUSE_STREAMS | |
134 |