| 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 |