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3d4c6a21 1/////////////////////////////////////////////////////////////////////////////
32fc4afb 2// Name: mstream.cpp
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3// Purpose: "Memory stream" classes
4// Author: Guilhem Lavaux
5// Modified by:
6// Created: 04/01/98
7// RCS-ID: $Id$
8// Copyright: (c) Guilhem Lavaux
9// Licence: wxWindows license
10/////////////////////////////////////////////////////////////////////////////
11
12#ifdef __GNUG__
32fc4afb 13#pragma implementation "mstream.h"
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14#endif
15
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16// For compilers that support precompilation, includes "wx.h".
17#include "wx/wxprec.h"
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18
19#ifdef __BORLANDC__
ce4169a4 20 #pragma hdrstop
79c3e0e1 21#endif
3d4c6a21 22
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23#if wxUSE_STREAMS
24
25#include <stdlib.h>
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26#include "wx/stream.h"
27#include "wx/mstream.h"
ce4169a4 28
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29// ----------------------------------------------------------------------------
30// wxMemoryInputStream
31// ----------------------------------------------------------------------------
32
33wxMemoryInputStream::wxMemoryInputStream(const char *data, size_t len)
75ed1d15 34 : wxInputStream()
79c3e0e1 35{
c980c992 36 m_i_streambuf = new wxStreamBuffer(wxStreamBuffer::read);
2d0a075d 37 m_i_streambuf->SetBufferIO((char*) data, (char*) (data+len));
18c07b73 38 m_i_streambuf->SetIntPosition(0); // seek to start pos
75ed1d15 39 m_i_streambuf->Fixed(TRUE);
c980c992 40
18c07b73 41 m_length = len;
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42}
43
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44wxMemoryInputStream::~wxMemoryInputStream()
45{
c980c992 46 delete m_i_streambuf;
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47}
48
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49char wxMemoryInputStream::Peek()
50{
75ed1d15 51 return m_i_streambuf->GetBufferStart()[m_i_streambuf->GetIntPosition()];
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52}
53
54size_t wxMemoryInputStream::OnSysRead(void *buffer, size_t nbytes)
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55{
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;
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62}
63
64off_t wxMemoryInputStream::OnSysSeek(off_t pos, wxSeekMode mode)
65{
66 return m_i_streambuf->Seek(pos, mode);
67}
68
69off_t wxMemoryInputStream::OnSysTell() const
70{
71 return m_i_streambuf->Tell();
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72}
73
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74// ----------------------------------------------------------------------------
75// wxMemoryOutputStream
76// ----------------------------------------------------------------------------
77
78wxMemoryOutputStream::wxMemoryOutputStream(char *data, size_t len)
75ed1d15 79 : wxOutputStream()
79c3e0e1 80{
c980c992 81 m_o_streambuf = new wxStreamBuffer(wxStreamBuffer::write);
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82 if (data)
83 m_o_streambuf->SetBufferIO(data, data+len);
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84 m_o_streambuf->Fixed(FALSE);
85 m_o_streambuf->Flushable(FALSE);
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86}
87
0cd9bfe8 88wxMemoryOutputStream::~wxMemoryOutputStream()
79c3e0e1 89{
c980c992 90 delete m_o_streambuf;
3d4c6a21 91}
ce4169a4 92
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93size_t wxMemoryOutputStream::OnSysWrite(const void *buffer, size_t nbytes)
94{
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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;
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101}
102
103off_t wxMemoryOutputStream::OnSysSeek(off_t pos, wxSeekMode mode)
104{
105 return m_o_streambuf->Seek(pos, mode);
106}
107
108off_t wxMemoryOutputStream::OnSysTell() const
109{
110 return m_o_streambuf->Tell();
111}
112
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113size_t wxMemoryOutputStream::CopyTo(char *buffer, size_t len) const
114{
115 if (!buffer)
116 return 0;
117
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118 if (len > GetSize())
119 len = GetSize();
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120
121 memcpy(buffer, m_o_streambuf->GetBufferStart(), len);
122 return len;
123}
c980c992 124
ce4169a4 125#endif