| 1 | ///////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: wx/stdstream.h |
| 3 | // Purpose: Implementation of std::istream and std::ostream derived |
| 4 | // wrappers for wxInputStream and wxOutputStream |
| 5 | // Author: Jonathan Liu <net147@gmail.com> |
| 6 | // Created: 2009-05-02 |
| 7 | // RCS-ID: $Id$ |
| 8 | // Copyright: (c) 2009 Jonathan Liu |
| 9 | // Licence: wxWindows licence |
| 10 | ///////////////////////////////////////////////////////////////////////////// |
| 11 | |
| 12 | // ========================================================================== |
| 13 | // Declarations |
| 14 | // ========================================================================== |
| 15 | |
| 16 | // For compilers that support precompilation, includes "wx.h". |
| 17 | #include "wx/wxprec.h" |
| 18 | |
| 19 | #ifdef __BORLANDC__ |
| 20 | #pragma hdrstop |
| 21 | #endif |
| 22 | |
| 23 | #if wxUSE_STREAMS && wxUSE_STD_IOSTREAM |
| 24 | |
| 25 | #ifndef WX_PRECOMP |
| 26 | #endif |
| 27 | |
| 28 | #include "wx/stdstream.h" |
| 29 | |
| 30 | #include <ios> |
| 31 | #include <istream> |
| 32 | #include <ostream> |
| 33 | #include <streambuf> |
| 34 | |
| 35 | // ========================================================================== |
| 36 | // Helpers |
| 37 | // ========================================================================== |
| 38 | |
| 39 | namespace |
| 40 | { |
| 41 | |
| 42 | bool |
| 43 | IosSeekDirToWxSeekMode(std::ios_base::seekdir way, |
| 44 | wxSeekMode& seekMode) |
| 45 | { |
| 46 | switch ( way ) |
| 47 | { |
| 48 | case std::ios_base::beg: |
| 49 | seekMode = wxFromStart; |
| 50 | break; |
| 51 | case std::ios_base::cur: |
| 52 | seekMode = wxFromCurrent; |
| 53 | break; |
| 54 | case std::ios_base::end: |
| 55 | seekMode = wxFromEnd; |
| 56 | break; |
| 57 | default: |
| 58 | return false; |
| 59 | } |
| 60 | |
| 61 | return true; |
| 62 | } |
| 63 | |
| 64 | } // anonymous namespace |
| 65 | |
| 66 | // ========================================================================== |
| 67 | // wxStdInputStreamBuffer |
| 68 | // ========================================================================== |
| 69 | |
| 70 | wxStdInputStreamBuffer::wxStdInputStreamBuffer(wxInputStream& stream) : |
| 71 | m_stream(stream), m_lastChar(EOF) |
| 72 | { |
| 73 | } |
| 74 | |
| 75 | std::streambuf * |
| 76 | wxStdInputStreamBuffer::setbuf(char *WXUNUSED(s), |
| 77 | std::streamsize WXUNUSED(n)) |
| 78 | { |
| 79 | return NULL; |
| 80 | } |
| 81 | |
| 82 | std::streampos |
| 83 | wxStdInputStreamBuffer::seekoff(std::streamoff off, |
| 84 | std::ios_base::seekdir way, |
| 85 | std::ios_base::openmode which) |
| 86 | { |
| 87 | wxSeekMode seekMode; |
| 88 | |
| 89 | if ( !IosSeekDirToWxSeekMode(way, seekMode) ) |
| 90 | return -1; |
| 91 | if ( !(which & std::ios_base::in) ) |
| 92 | return -1; |
| 93 | |
| 94 | off_t newPos = m_stream.SeekI((off_t) off, seekMode); |
| 95 | |
| 96 | if ( newPos != wxInvalidOffset ) |
| 97 | return (std::streampos) newPos; |
| 98 | else |
| 99 | return -1; |
| 100 | } |
| 101 | |
| 102 | std::streampos |
| 103 | wxStdInputStreamBuffer::seekpos(std::streampos sp, |
| 104 | std::ios_base::openmode which) |
| 105 | { |
| 106 | if ( !(which & std::ios_base::in) ) |
| 107 | return -1; |
| 108 | |
| 109 | off_t newPos = m_stream.SeekI((off_t) sp); |
| 110 | |
| 111 | if ( newPos != wxInvalidOffset ) |
| 112 | return (std::streampos) newPos; |
| 113 | else |
| 114 | return -1; |
| 115 | } |
| 116 | |
| 117 | std::streamsize |
| 118 | wxStdInputStreamBuffer::showmanyc() |
| 119 | { |
| 120 | if ( m_stream.CanRead() && (off_t) m_stream.GetSize() > m_stream.TellI() ) |
| 121 | return m_stream.GetSize() - m_stream.TellI(); |
| 122 | else |
| 123 | return 0; |
| 124 | } |
| 125 | |
| 126 | std::streamsize |
| 127 | wxStdInputStreamBuffer::xsgetn(char *s, std::streamsize n) |
| 128 | { |
| 129 | m_stream.Read((void *) s, (size_t) n); |
| 130 | |
| 131 | std::streamsize read = m_stream.LastRead(); |
| 132 | |
| 133 | if ( read > 0 ) |
| 134 | m_lastChar = (unsigned char) s[read - 1]; |
| 135 | |
| 136 | return read; |
| 137 | } |
| 138 | |
| 139 | int |
| 140 | wxStdInputStreamBuffer::underflow() |
| 141 | { |
| 142 | int ch = m_stream.GetC(); |
| 143 | |
| 144 | if ( m_stream.LastRead() == 1 ) |
| 145 | { |
| 146 | m_stream.Ungetch((char) ch); |
| 147 | return ch; |
| 148 | } |
| 149 | else |
| 150 | { |
| 151 | return EOF; |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | int |
| 156 | wxStdInputStreamBuffer::uflow() |
| 157 | { |
| 158 | int ch = m_stream.GetC(); |
| 159 | |
| 160 | if ( m_stream.LastRead() == 1 ) |
| 161 | { |
| 162 | m_lastChar = ch; |
| 163 | return ch; |
| 164 | } |
| 165 | else |
| 166 | { |
| 167 | return EOF; |
| 168 | } |
| 169 | } |
| 170 | |
| 171 | int |
| 172 | wxStdInputStreamBuffer::pbackfail(int c) |
| 173 | { |
| 174 | if ( c == EOF ) |
| 175 | { |
| 176 | if ( m_lastChar == EOF ) |
| 177 | return EOF; |
| 178 | |
| 179 | c = m_lastChar; |
| 180 | m_lastChar = EOF; |
| 181 | } |
| 182 | |
| 183 | return m_stream.Ungetch((char) c) ? c : EOF; |
| 184 | } |
| 185 | |
| 186 | // ========================================================================== |
| 187 | // wxStdOutputStreamBuffer |
| 188 | // ========================================================================== |
| 189 | |
| 190 | wxStdOutputStreamBuffer::wxStdOutputStreamBuffer(wxOutputStream& stream) : |
| 191 | m_stream(stream) |
| 192 | { |
| 193 | } |
| 194 | |
| 195 | std::streambuf * |
| 196 | wxStdOutputStreamBuffer::setbuf(char *WXUNUSED(s), |
| 197 | std::streamsize WXUNUSED(n)) |
| 198 | { |
| 199 | return NULL; |
| 200 | } |
| 201 | |
| 202 | std::streampos |
| 203 | wxStdOutputStreamBuffer::seekoff(std::streamoff off, |
| 204 | std::ios_base::seekdir way, |
| 205 | std::ios_base::openmode which) |
| 206 | { |
| 207 | wxSeekMode seekMode; |
| 208 | |
| 209 | if ( !IosSeekDirToWxSeekMode(way, seekMode) ) |
| 210 | return -1; |
| 211 | if ( !(which & std::ios_base::out) ) |
| 212 | return -1; |
| 213 | |
| 214 | off_t newPos = m_stream.SeekO((off_t) off, seekMode); |
| 215 | |
| 216 | if ( newPos != wxInvalidOffset ) |
| 217 | return (std::streampos) newPos; |
| 218 | else |
| 219 | return -1; |
| 220 | } |
| 221 | |
| 222 | std::streampos |
| 223 | wxStdOutputStreamBuffer::seekpos(std::streampos sp, |
| 224 | std::ios_base::openmode which) |
| 225 | { |
| 226 | if ( !(which & std::ios_base::out) ) |
| 227 | return -1; |
| 228 | |
| 229 | off_t newPos = m_stream.SeekO((off_t) sp); |
| 230 | |
| 231 | if ( newPos != wxInvalidOffset ) |
| 232 | return (std::streampos) newPos; |
| 233 | else |
| 234 | return -1; |
| 235 | } |
| 236 | |
| 237 | std::streamsize |
| 238 | wxStdOutputStreamBuffer::xsputn(const char *s, |
| 239 | std::streamsize n) |
| 240 | { |
| 241 | m_stream.Write((const void *) s, (size_t) n); |
| 242 | return (std::streamsize) m_stream.LastWrite(); |
| 243 | } |
| 244 | |
| 245 | int |
| 246 | wxStdOutputStreamBuffer::overflow(int c) |
| 247 | { |
| 248 | m_stream.PutC(c); |
| 249 | return m_stream.IsOk() ? c : EOF; |
| 250 | } |
| 251 | |
| 252 | // ========================================================================== |
| 253 | // wxStdInputStream and wxStdOutputStream |
| 254 | // ========================================================================== |
| 255 | |
| 256 | // FIXME-VC6: it is impossible to call basic_ios<char>::init() with this |
| 257 | // compiler, it complains about invalid call to non-static member |
| 258 | // function so use a suspicious (as it uses a pointer to not yet |
| 259 | // constructed streambuf) but working workaround |
| 260 | // |
| 261 | // It also doesn't like using istream in the ctor initializer list |
| 262 | // and we must spell it out as basic_istream<char>. |
| 263 | #ifdef __VISUALC6__ |
| 264 | |
| 265 | wxStdInputStream::wxStdInputStream(wxInputStream& stream) |
| 266 | : std::basic_istream<char, std::char_traits<char> >(&m_streamBuffer), |
| 267 | m_streamBuffer(stream) |
| 268 | { |
| 269 | } |
| 270 | |
| 271 | wxStdOutputStream::wxStdOutputStream(wxOutputStream& stream) |
| 272 | : std::basic_ostream<char, std::char_traits<char> >(&m_streamBuffer), |
| 273 | m_streamBuffer(stream) |
| 274 | { |
| 275 | } |
| 276 | |
| 277 | #else // !VC6 |
| 278 | |
| 279 | wxStdInputStream::wxStdInputStream(wxInputStream& stream) : |
| 280 | std::istream(NULL), m_streamBuffer(stream) |
| 281 | { |
| 282 | std::ios::init(&m_streamBuffer); |
| 283 | } |
| 284 | |
| 285 | wxStdOutputStream::wxStdOutputStream(wxOutputStream& stream) : |
| 286 | std::ostream(NULL), m_streamBuffer(stream) |
| 287 | { |
| 288 | std::ios::init(&m_streamBuffer); |
| 289 | } |
| 290 | |
| 291 | #endif // VC6/!VC6 |
| 292 | |
| 293 | #endif // wxUSE_STREAMS && wxUSE_STD_IOSTREAM |