| 1 | ///////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: src/common/stream.cpp |
| 3 | // Purpose: wxStream base classes |
| 4 | // Author: Guilhem Lavaux |
| 5 | // Modified by: VZ (23.11.00) to fix realloc()ing new[]ed memory, |
| 6 | // general code review |
| 7 | // Created: 11/07/98 |
| 8 | // RCS-ID: $Id$ |
| 9 | // Copyright: (c) Guilhem Lavaux |
| 10 | // Licence: wxWindows license |
| 11 | ///////////////////////////////////////////////////////////////////////////// |
| 12 | |
| 13 | // ============================================================================ |
| 14 | // declarations |
| 15 | // ============================================================================ |
| 16 | |
| 17 | // ---------------------------------------------------------------------------- |
| 18 | // headers |
| 19 | // ---------------------------------------------------------------------------- |
| 20 | |
| 21 | #ifdef __GNUG__ |
| 22 | #pragma implementation "stream.h" |
| 23 | #endif |
| 24 | |
| 25 | // For compilers that support precompilation, includes "wx.h". |
| 26 | #include "wx/wxprec.h" |
| 27 | |
| 28 | #ifdef __BORLANDC__ |
| 29 | #pragma hdrstop |
| 30 | #endif |
| 31 | |
| 32 | #ifndef WX_PRECOMP |
| 33 | #include "wx/defs.h" |
| 34 | #endif |
| 35 | |
| 36 | #if wxUSE_STREAMS |
| 37 | |
| 38 | #include <ctype.h> |
| 39 | #include "wx/stream.h" |
| 40 | #include "wx/datstrm.h" |
| 41 | #include "wx/textfile.h" |
| 42 | |
| 43 | // ---------------------------------------------------------------------------- |
| 44 | // constants |
| 45 | // ---------------------------------------------------------------------------- |
| 46 | |
| 47 | // the temporary buffer size used when copying from stream to stream |
| 48 | #define BUF_TEMP_SIZE 10000 |
| 49 | |
| 50 | // ============================================================================ |
| 51 | // implementation |
| 52 | // ============================================================================ |
| 53 | |
| 54 | // ---------------------------------------------------------------------------- |
| 55 | // wxStreamBuffer |
| 56 | // ---------------------------------------------------------------------------- |
| 57 | |
| 58 | void wxStreamBuffer::SetError(wxStreamError err) |
| 59 | { |
| 60 | if ( m_stream->m_lasterror == wxStream_NOERROR ) |
| 61 | m_stream->m_lasterror = err; |
| 62 | } |
| 63 | |
| 64 | void wxStreamBuffer::InitBuffer() |
| 65 | { |
| 66 | m_buffer_start = |
| 67 | m_buffer_end = |
| 68 | m_buffer_pos = NULL; |
| 69 | m_buffer_size = 0; |
| 70 | |
| 71 | // if we are going to allocate the buffer, we should free it later as well |
| 72 | m_destroybuf = TRUE; |
| 73 | } |
| 74 | |
| 75 | void wxStreamBuffer::Init() |
| 76 | { |
| 77 | InitBuffer(); |
| 78 | |
| 79 | m_fixed = TRUE; |
| 80 | } |
| 81 | |
| 82 | wxStreamBuffer::wxStreamBuffer(wxStreamBase& stream, BufMode mode) |
| 83 | { |
| 84 | Init(); |
| 85 | |
| 86 | m_stream = &stream; |
| 87 | m_mode = mode; |
| 88 | |
| 89 | m_flushable = TRUE; |
| 90 | m_destroystream = FALSE; |
| 91 | } |
| 92 | |
| 93 | wxStreamBuffer::wxStreamBuffer(BufMode mode) |
| 94 | { |
| 95 | Init(); |
| 96 | |
| 97 | wxASSERT_MSG(mode != read_write, wxT("you have to use the other ctor for read_write mode") ); |
| 98 | if ( mode == read ) |
| 99 | m_stream = new wxInputStream; |
| 100 | else if ( mode == write) |
| 101 | m_stream = new wxOutputStream; |
| 102 | else |
| 103 | m_stream = NULL; |
| 104 | |
| 105 | m_mode = mode; |
| 106 | |
| 107 | m_flushable = FALSE; |
| 108 | m_destroystream = TRUE; |
| 109 | } |
| 110 | |
| 111 | wxStreamBuffer::wxStreamBuffer(const wxStreamBuffer& buffer) |
| 112 | { |
| 113 | // doing this has big chances to lead to a crashwhen the source buffer is |
| 114 | // destroyed (otherwise assume the caller knows what he does) |
| 115 | wxASSERT_MSG( !buffer.m_destroybuf && !buffer.m_destroystream, |
| 116 | _T("it's a bad idea to copy this buffer") ); |
| 117 | |
| 118 | m_buffer_start = buffer.m_buffer_start; |
| 119 | m_buffer_end = buffer.m_buffer_end; |
| 120 | m_buffer_pos = buffer.m_buffer_pos; |
| 121 | m_buffer_size = buffer.m_buffer_size; |
| 122 | m_fixed = buffer.m_fixed; |
| 123 | m_flushable = buffer.m_flushable; |
| 124 | m_stream = buffer.m_stream; |
| 125 | m_mode = buffer.m_mode; |
| 126 | m_destroybuf = FALSE; |
| 127 | m_destroystream = FALSE; |
| 128 | } |
| 129 | |
| 130 | void wxStreamBuffer::FreeBuffer() |
| 131 | { |
| 132 | if ( m_destroybuf ) |
| 133 | free(m_buffer_start); |
| 134 | } |
| 135 | |
| 136 | wxStreamBuffer::~wxStreamBuffer() |
| 137 | { |
| 138 | FreeBuffer(); |
| 139 | |
| 140 | if ( m_destroystream ) |
| 141 | delete m_stream; |
| 142 | } |
| 143 | |
| 144 | wxInputStream *wxStreamBuffer::GetInputStream() const |
| 145 | { |
| 146 | return m_mode == write ? NULL : (wxInputStream *)m_stream; |
| 147 | } |
| 148 | |
| 149 | wxOutputStream *wxStreamBuffer::GetOutputStream() const |
| 150 | { |
| 151 | return m_mode == read ? NULL : (wxOutputStream *)m_stream; |
| 152 | } |
| 153 | |
| 154 | void wxStreamBuffer::SetBufferIO(void *buffer_start, |
| 155 | void *buffer_end, |
| 156 | bool takeOwnership) |
| 157 | { |
| 158 | SetBufferIO(buffer_start, (char *)buffer_end - (char *)buffer_start, |
| 159 | takeOwnership); |
| 160 | } |
| 161 | |
| 162 | void wxStreamBuffer::SetBufferIO(void *start, |
| 163 | size_t len, |
| 164 | bool takeOwnership) |
| 165 | { |
| 166 | // start by freeing the old buffer |
| 167 | FreeBuffer(); |
| 168 | |
| 169 | m_buffer_start = (char *)start; |
| 170 | m_buffer_end = m_buffer_start + len; |
| 171 | |
| 172 | m_buffer_size = len; |
| 173 | |
| 174 | // if we own it, we free it |
| 175 | m_destroybuf = takeOwnership; |
| 176 | |
| 177 | ResetBuffer(); |
| 178 | } |
| 179 | |
| 180 | void wxStreamBuffer::SetBufferIO(size_t bufsize) |
| 181 | { |
| 182 | // start by freeing the old buffer |
| 183 | FreeBuffer(); |
| 184 | |
| 185 | if ( bufsize ) |
| 186 | { |
| 187 | SetBufferIO(malloc(bufsize), bufsize, TRUE /* take ownership */); |
| 188 | } |
| 189 | else // no buffer size => no buffer |
| 190 | { |
| 191 | InitBuffer(); |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | void wxStreamBuffer::ResetBuffer() |
| 196 | { |
| 197 | wxCHECK_RET( m_stream, _T("should have a stream in wxStreamBuffer") ); |
| 198 | |
| 199 | m_stream->m_lasterror = wxStream_NOERROR; |
| 200 | m_stream->m_lastcount = 0; |
| 201 | if (m_mode == read && m_flushable) |
| 202 | m_buffer_pos = m_buffer_end; |
| 203 | else |
| 204 | m_buffer_pos = m_buffer_start; |
| 205 | } |
| 206 | |
| 207 | // fill the buffer with as much data as possible (only for read buffers) |
| 208 | bool wxStreamBuffer::FillBuffer() |
| 209 | { |
| 210 | wxInputStream *inStream = GetInputStream(); |
| 211 | |
| 212 | wxCHECK_MSG( inStream, FALSE, _T("should have a stream in wxStreamBuffer") ); |
| 213 | |
| 214 | size_t count = inStream->OnSysRead(m_buffer_start, m_buffer_size); |
| 215 | if ( !count ) |
| 216 | return FALSE; |
| 217 | |
| 218 | m_buffer_end = m_buffer_start + count; |
| 219 | m_buffer_pos = m_buffer_start; |
| 220 | |
| 221 | return TRUE; |
| 222 | } |
| 223 | |
| 224 | // write the buffer contents to the stream (only for write buffers) |
| 225 | bool wxStreamBuffer::FlushBuffer() |
| 226 | { |
| 227 | wxCHECK_MSG( m_flushable, FALSE, _T("can't flush this buffer") ); |
| 228 | |
| 229 | // FIXME: what is this check for? (VZ) |
| 230 | if ( m_buffer_pos == m_buffer_start ) |
| 231 | return FALSE; |
| 232 | |
| 233 | wxOutputStream *outStream = GetOutputStream(); |
| 234 | |
| 235 | wxCHECK_MSG( outStream, FALSE, _T("should have a stream in wxStreamBuffer") ); |
| 236 | |
| 237 | size_t current = m_buffer_pos - m_buffer_start; |
| 238 | size_t count = outStream->OnSysWrite(m_buffer_start, current); |
| 239 | if ( count != current ) |
| 240 | return FALSE; |
| 241 | |
| 242 | m_buffer_pos = m_buffer_start; |
| 243 | |
| 244 | return TRUE; |
| 245 | } |
| 246 | |
| 247 | size_t wxStreamBuffer::GetDataLeft() |
| 248 | { |
| 249 | /* Why is this done? RR. */ |
| 250 | if ( m_buffer_pos == m_buffer_end && m_flushable) |
| 251 | FillBuffer(); |
| 252 | |
| 253 | return GetBytesLeft(); |
| 254 | } |
| 255 | |
| 256 | // copy up to size bytes from our buffer into the provided one |
| 257 | void wxStreamBuffer::GetFromBuffer(void *buffer, size_t size) |
| 258 | { |
| 259 | // don't get more bytes than left in the buffer |
| 260 | size_t left = GetBytesLeft(); |
| 261 | |
| 262 | if ( size > left ) |
| 263 | size = left; |
| 264 | |
| 265 | memcpy(buffer, m_buffer_pos, size); |
| 266 | m_buffer_pos += size; |
| 267 | } |
| 268 | |
| 269 | // copy the contents of the provided buffer into this one |
| 270 | void wxStreamBuffer::PutToBuffer(const void *buffer, size_t size) |
| 271 | { |
| 272 | size_t left = GetBytesLeft(); |
| 273 | if ( size > left ) |
| 274 | { |
| 275 | if ( m_fixed ) |
| 276 | { |
| 277 | // we can't realloc the buffer, so just copy what we can |
| 278 | size = left; |
| 279 | } |
| 280 | else // !m_fixed |
| 281 | { |
| 282 | // realloc the buffer to have enough space for the data |
| 283 | size_t delta = m_buffer_pos - m_buffer_start; |
| 284 | |
| 285 | char *startOld = m_buffer_start; |
| 286 | m_buffer_size += size; |
| 287 | m_buffer_start = (char *)realloc(m_buffer_start, m_buffer_size); |
| 288 | if ( !m_buffer_start ) |
| 289 | { |
| 290 | // don't leak memory if realloc() failed |
| 291 | m_buffer_start = startOld; |
| 292 | m_buffer_size -= size; |
| 293 | |
| 294 | // what else can we do? |
| 295 | return; |
| 296 | } |
| 297 | |
| 298 | // adjust the pointers invalidated by realloc() |
| 299 | m_buffer_pos = m_buffer_start + delta; |
| 300 | m_buffer_end = m_buffer_start + m_buffer_size; |
| 301 | } |
| 302 | } |
| 303 | |
| 304 | memcpy(m_buffer_pos, buffer, size); |
| 305 | m_buffer_pos += size; |
| 306 | } |
| 307 | |
| 308 | void wxStreamBuffer::PutChar(char c) |
| 309 | { |
| 310 | wxOutputStream *outStream = GetOutputStream(); |
| 311 | |
| 312 | wxCHECK_RET( outStream, _T("should have a stream in wxStreamBuffer") ); |
| 313 | |
| 314 | // if we don't have buffer at all, just forward this call to the stream, |
| 315 | if ( !HasBuffer() ) |
| 316 | { |
| 317 | outStream->OnSysWrite(&c, 1); |
| 318 | } |
| 319 | else |
| 320 | { |
| 321 | // otherwise check we have enough space left |
| 322 | if ( !GetDataLeft() && !FlushBuffer() ) |
| 323 | { |
| 324 | // we don't |
| 325 | SetError(wxStream_WRITE_ERR); |
| 326 | } |
| 327 | else |
| 328 | { |
| 329 | PutToBuffer(&c, 1); |
| 330 | m_stream->m_lastcount = 1; |
| 331 | } |
| 332 | } |
| 333 | } |
| 334 | |
| 335 | char wxStreamBuffer::Peek() |
| 336 | { |
| 337 | wxCHECK_MSG( m_stream && HasBuffer(), 0, |
| 338 | _T("should have the stream and the buffer in wxStreamBuffer") ); |
| 339 | |
| 340 | if ( !GetDataLeft() ) |
| 341 | { |
| 342 | SetError(wxStream_READ_ERR); |
| 343 | return 0; |
| 344 | } |
| 345 | |
| 346 | char c; |
| 347 | GetFromBuffer(&c, 1); |
| 348 | m_buffer_pos--; |
| 349 | |
| 350 | return c; |
| 351 | } |
| 352 | |
| 353 | char wxStreamBuffer::GetChar() |
| 354 | { |
| 355 | wxInputStream *inStream = GetInputStream(); |
| 356 | |
| 357 | wxCHECK_MSG( inStream, 0, _T("should have a stream in wxStreamBuffer") ); |
| 358 | |
| 359 | char c; |
| 360 | if ( !HasBuffer() ) |
| 361 | { |
| 362 | inStream->OnSysRead(&c, 1); |
| 363 | } |
| 364 | else |
| 365 | { |
| 366 | if ( !GetDataLeft() ) |
| 367 | { |
| 368 | SetError(wxStream_READ_ERR); |
| 369 | c = 0; |
| 370 | } |
| 371 | else |
| 372 | { |
| 373 | GetFromBuffer(&c, 1); |
| 374 | m_stream->m_lastcount = 1; |
| 375 | } |
| 376 | } |
| 377 | |
| 378 | return c; |
| 379 | } |
| 380 | |
| 381 | size_t wxStreamBuffer::Read(void *buffer, size_t size) |
| 382 | { |
| 383 | wxInputStream *inStream = GetInputStream(); |
| 384 | |
| 385 | wxCHECK_MSG( inStream, 0, _T("should have a stream in wxStreamBuffer") ); |
| 386 | |
| 387 | // lasterror is reset before all new IO calls |
| 388 | m_stream->m_lasterror = wxStream_NOERROR; |
| 389 | |
| 390 | if ( !HasBuffer() ) |
| 391 | { |
| 392 | m_stream->m_lastcount = inStream->OnSysRead(buffer, size); |
| 393 | } |
| 394 | else // we have a buffer, use it |
| 395 | { |
| 396 | size_t orig_size = size; |
| 397 | |
| 398 | while ( size > 0 ) |
| 399 | { |
| 400 | size_t left = GetDataLeft(); |
| 401 | |
| 402 | // if the requested number of bytes if greater than the buffer |
| 403 | // size, read data in chunks |
| 404 | if ( size > left ) |
| 405 | { |
| 406 | GetFromBuffer(buffer, left); |
| 407 | size -= left; |
| 408 | buffer = (char *)buffer + left; |
| 409 | |
| 410 | if ( !FillBuffer() ) |
| 411 | { |
| 412 | SetError(wxStream_EOF); |
| 413 | break; |
| 414 | } |
| 415 | } |
| 416 | else // otherwise just do it in one gulp |
| 417 | { |
| 418 | GetFromBuffer(buffer, size); |
| 419 | size = 0; |
| 420 | } |
| 421 | } |
| 422 | |
| 423 | m_stream->m_lastcount = orig_size - size; |
| 424 | } |
| 425 | |
| 426 | return m_stream->m_lastcount; |
| 427 | } |
| 428 | |
| 429 | // this should really be called "Copy()" |
| 430 | size_t wxStreamBuffer::Read(wxStreamBuffer *dbuf) |
| 431 | { |
| 432 | wxCHECK_MSG( m_mode != write, 0, _T("can't read from this buffer") ); |
| 433 | |
| 434 | char buf[BUF_TEMP_SIZE]; |
| 435 | size_t nRead, |
| 436 | total = 0; |
| 437 | |
| 438 | do |
| 439 | { |
| 440 | nRead = Read(dbuf, WXSIZEOF(buf)); |
| 441 | if ( nRead ) |
| 442 | { |
| 443 | nRead = dbuf->Write(buf, nRead); |
| 444 | total += nRead; |
| 445 | } |
| 446 | } |
| 447 | while ( nRead ); |
| 448 | |
| 449 | return total; |
| 450 | } |
| 451 | |
| 452 | size_t wxStreamBuffer::Write(const void *buffer, size_t size) |
| 453 | { |
| 454 | wxOutputStream *outStream = GetOutputStream(); |
| 455 | |
| 456 | wxCHECK_MSG( outStream, 0, _T("should have a stream in wxStreamBuffer") ); |
| 457 | |
| 458 | // lasterror is reset before all new IO calls |
| 459 | m_stream->m_lasterror = wxStream_NOERROR; |
| 460 | |
| 461 | if ( !HasBuffer() && m_fixed ) |
| 462 | { |
| 463 | // no buffer, just forward the call to the stream |
| 464 | m_stream->m_lastcount = outStream->OnSysWrite(buffer, size); |
| 465 | } |
| 466 | else // we [may] have a buffer, use it |
| 467 | { |
| 468 | size_t orig_size = size; |
| 469 | |
| 470 | while ( size > 0 ) |
| 471 | { |
| 472 | size_t left = GetBytesLeft(); |
| 473 | |
| 474 | // if the buffer is too large to fit in the stream buffer, split |
| 475 | // it in smaller parts |
| 476 | // |
| 477 | // NB: If stream buffer isn't fixed (as for wxMemoryOutputStream), |
| 478 | // we always go to the second case. |
| 479 | // |
| 480 | // FIXME: fine, but if it fails we should (re)try writing it by |
| 481 | // chunks as this will (hopefully) always work (VZ) |
| 482 | if ( size > left && m_fixed ) |
| 483 | { |
| 484 | PutToBuffer(buffer, left); |
| 485 | size -= left; |
| 486 | buffer = (char *)buffer + left; |
| 487 | |
| 488 | if ( !FlushBuffer() ) |
| 489 | { |
| 490 | SetError(wxStream_WRITE_ERR); |
| 491 | |
| 492 | break; |
| 493 | } |
| 494 | |
| 495 | m_buffer_pos = m_buffer_start; |
| 496 | } |
| 497 | else // we can do it in one gulp |
| 498 | { |
| 499 | PutToBuffer(buffer, size); |
| 500 | size = 0; |
| 501 | } |
| 502 | } |
| 503 | |
| 504 | m_stream->m_lastcount = orig_size - size; |
| 505 | } |
| 506 | |
| 507 | return m_stream->m_lastcount; |
| 508 | } |
| 509 | |
| 510 | size_t wxStreamBuffer::Write(wxStreamBuffer *sbuf) |
| 511 | { |
| 512 | wxCHECK_MSG( m_mode != read, 0, _T("can't write to this buffer") ); |
| 513 | wxCHECK_MSG( sbuf->m_mode != write, 0, _T("can't read from that buffer") ); |
| 514 | |
| 515 | char buf[BUF_TEMP_SIZE]; |
| 516 | size_t nWrite, |
| 517 | total = 0; |
| 518 | |
| 519 | do |
| 520 | { |
| 521 | size_t nRead = sbuf->Read(buf, WXSIZEOF(buf)); |
| 522 | if ( nRead ) |
| 523 | { |
| 524 | nWrite = Write(buf, nRead); |
| 525 | if ( nWrite < nRead ) |
| 526 | { |
| 527 | // put back data we couldn't copy |
| 528 | wxInputStream *in_stream = (wxInputStream *)sbuf->GetStream(); |
| 529 | |
| 530 | in_stream->Ungetch(buf + nWrite, nRead - nWrite); |
| 531 | } |
| 532 | |
| 533 | total += nWrite; |
| 534 | } |
| 535 | else |
| 536 | { |
| 537 | nWrite = 0; |
| 538 | } |
| 539 | } |
| 540 | while ( nWrite == WXSIZEOF(buf) ); |
| 541 | |
| 542 | return total; |
| 543 | } |
| 544 | |
| 545 | off_t wxStreamBuffer::Seek(off_t pos, wxSeekMode mode) |
| 546 | { |
| 547 | off_t ret_off, diff; |
| 548 | |
| 549 | off_t last_access = GetLastAccess(); |
| 550 | |
| 551 | if ( !m_flushable ) |
| 552 | { |
| 553 | switch (mode) |
| 554 | { |
| 555 | case wxFromStart: |
| 556 | diff = pos; |
| 557 | break; |
| 558 | |
| 559 | case wxFromCurrent: |
| 560 | diff = pos + GetIntPosition(); |
| 561 | break; |
| 562 | |
| 563 | case wxFromEnd: |
| 564 | diff = pos + last_access; |
| 565 | break; |
| 566 | |
| 567 | default: |
| 568 | wxFAIL_MSG( _T("invalid seek mode") ); |
| 569 | |
| 570 | return wxInvalidOffset; |
| 571 | } |
| 572 | if (diff < 0 || diff > last_access) |
| 573 | return wxInvalidOffset; |
| 574 | SetIntPosition(diff); |
| 575 | return diff; |
| 576 | } |
| 577 | |
| 578 | switch ( mode ) |
| 579 | { |
| 580 | case wxFromStart: |
| 581 | // We'll try to compute an internal position later ... |
| 582 | ret_off = m_stream->OnSysSeek(pos, wxFromStart); |
| 583 | ResetBuffer(); |
| 584 | return ret_off; |
| 585 | |
| 586 | case wxFromCurrent: |
| 587 | diff = pos + GetIntPosition(); |
| 588 | |
| 589 | if ( (diff > last_access) || (diff < 0) ) |
| 590 | { |
| 591 | // We must take into account the fact that we have read |
| 592 | // something previously. |
| 593 | ret_off = m_stream->OnSysSeek(diff-last_access, wxFromCurrent); |
| 594 | ResetBuffer(); |
| 595 | return ret_off; |
| 596 | } |
| 597 | else |
| 598 | { |
| 599 | SetIntPosition(diff); |
| 600 | return pos; |
| 601 | } |
| 602 | |
| 603 | case wxFromEnd: |
| 604 | // Hard to compute: always seek to the requested position. |
| 605 | ret_off = m_stream->OnSysSeek(pos, wxFromEnd); |
| 606 | ResetBuffer(); |
| 607 | return ret_off; |
| 608 | } |
| 609 | |
| 610 | return wxInvalidOffset; |
| 611 | } |
| 612 | |
| 613 | off_t wxStreamBuffer::Tell() const |
| 614 | { |
| 615 | off_t pos = m_stream->OnSysTell(); |
| 616 | if ( pos == wxInvalidOffset ) |
| 617 | return wxInvalidOffset; |
| 618 | |
| 619 | pos += GetIntPosition(); |
| 620 | |
| 621 | if ( m_mode == read && m_flushable ) |
| 622 | pos -= GetLastAccess(); |
| 623 | |
| 624 | return pos; |
| 625 | } |
| 626 | |
| 627 | // ---------------------------------------------------------------------------- |
| 628 | // wxStreamBase |
| 629 | // ---------------------------------------------------------------------------- |
| 630 | |
| 631 | wxStreamBase::wxStreamBase() |
| 632 | { |
| 633 | m_lasterror = wxStream_NOERROR; |
| 634 | m_lastcount = 0; |
| 635 | } |
| 636 | |
| 637 | wxStreamBase::~wxStreamBase() |
| 638 | { |
| 639 | } |
| 640 | |
| 641 | off_t wxStreamBase::OnSysSeek(off_t WXUNUSED(seek), wxSeekMode WXUNUSED(mode)) |
| 642 | { |
| 643 | return wxInvalidOffset; |
| 644 | } |
| 645 | |
| 646 | off_t wxStreamBase::OnSysTell() const |
| 647 | { |
| 648 | return wxInvalidOffset; |
| 649 | } |
| 650 | |
| 651 | // ---------------------------------------------------------------------------- |
| 652 | // wxInputStream |
| 653 | // ---------------------------------------------------------------------------- |
| 654 | |
| 655 | wxInputStream::wxInputStream() |
| 656 | { |
| 657 | m_wback = NULL; |
| 658 | m_wbacksize = |
| 659 | m_wbackcur = 0; |
| 660 | } |
| 661 | |
| 662 | wxInputStream::~wxInputStream() |
| 663 | { |
| 664 | free(m_wback); |
| 665 | } |
| 666 | |
| 667 | size_t wxInputStream::OnSysRead(void * WXUNUSED(buffer), |
| 668 | size_t WXUNUSED(bufsize)) |
| 669 | { |
| 670 | return 0; |
| 671 | } |
| 672 | |
| 673 | bool wxInputStream::Eof() const |
| 674 | { |
| 675 | wxInputStream *self = wxConstCast(this, wxInputStream); |
| 676 | |
| 677 | char c; |
| 678 | self->Read(&c, 1); |
| 679 | |
| 680 | // some streams can know that they're at EOF before actually trying to |
| 681 | // read beyond the end of stream (e.g. files) while others have no way of |
| 682 | // knowing it, so to provide the same behaviour in all cases we only |
| 683 | // return TRUE from here if the character really couldn't be read |
| 684 | if ( !self->LastRead() && GetLastError() == wxSTREAM_EOF ) |
| 685 | { |
| 686 | return TRUE; |
| 687 | } |
| 688 | |
| 689 | self->Ungetch(c); |
| 690 | |
| 691 | return FALSE; |
| 692 | } |
| 693 | |
| 694 | char *wxInputStream::AllocSpaceWBack(size_t needed_size) |
| 695 | { |
| 696 | // get number of bytes left from previous wback buffer |
| 697 | size_t toget = m_wbacksize - m_wbackcur; |
| 698 | |
| 699 | // allocate a buffer large enough to hold prev + new data |
| 700 | char *temp_b = (char *)malloc(needed_size + toget); |
| 701 | |
| 702 | if (!temp_b) |
| 703 | return NULL; |
| 704 | |
| 705 | /* copy previous data (and free old buffer) if needed */ |
| 706 | if (m_wback) |
| 707 | { |
| 708 | memmove(temp_b + needed_size, m_wback + m_wbackcur, toget); |
| 709 | free(m_wback); |
| 710 | } |
| 711 | |
| 712 | /* done */ |
| 713 | m_wback = temp_b; |
| 714 | m_wbackcur = 0; |
| 715 | m_wbacksize = needed_size + toget; |
| 716 | |
| 717 | return m_wback; |
| 718 | } |
| 719 | |
| 720 | size_t wxInputStream::GetWBack(void *buf, size_t bsize) |
| 721 | { |
| 722 | if (!m_wback) |
| 723 | return 0; |
| 724 | |
| 725 | // how many bytes do we have in the buffer? |
| 726 | size_t toget = m_wbacksize - m_wbackcur; |
| 727 | |
| 728 | if ( bsize < toget ) |
| 729 | { |
| 730 | // we won't read everything |
| 731 | toget = bsize; |
| 732 | } |
| 733 | |
| 734 | // copy the data from the cache |
| 735 | memcpy(buf, m_wback + m_wbackcur, toget); |
| 736 | |
| 737 | m_wbackcur += toget; |
| 738 | if ( m_wbackcur == m_wbacksize ) |
| 739 | { |
| 740 | // TODO: should we really free it here all the time? maybe keep it? |
| 741 | free(m_wback); |
| 742 | m_wback = NULL; |
| 743 | m_wbacksize = 0; |
| 744 | m_wbackcur = 0; |
| 745 | } |
| 746 | |
| 747 | // return the number of bytes copied |
| 748 | return toget; |
| 749 | } |
| 750 | |
| 751 | size_t wxInputStream::Ungetch(const void *buf, size_t bufsize) |
| 752 | { |
| 753 | char *ptrback = AllocSpaceWBack(bufsize); |
| 754 | if (!ptrback) |
| 755 | return 0; |
| 756 | |
| 757 | memcpy(ptrback, buf, bufsize); |
| 758 | return bufsize; |
| 759 | } |
| 760 | |
| 761 | bool wxInputStream::Ungetch(char c) |
| 762 | { |
| 763 | void *ptrback = AllocSpaceWBack(1); |
| 764 | if (!ptrback) |
| 765 | return FALSE; |
| 766 | |
| 767 | *(char *)ptrback = c; |
| 768 | return TRUE; |
| 769 | } |
| 770 | |
| 771 | char wxInputStream::GetC() |
| 772 | { |
| 773 | char c; |
| 774 | Read(&c, 1); |
| 775 | return c; |
| 776 | } |
| 777 | |
| 778 | wxInputStream& wxInputStream::Read(void *buf, size_t size) |
| 779 | { |
| 780 | size_t retsize = GetWBack(buf, size); |
| 781 | if (retsize == size) |
| 782 | { |
| 783 | m_lastcount = size; |
| 784 | m_lasterror = wxStream_NOERROR; |
| 785 | return *this; |
| 786 | } |
| 787 | size -= retsize; |
| 788 | buf = (char *)buf + retsize; |
| 789 | |
| 790 | m_lastcount = OnSysRead(buf, size) + retsize; |
| 791 | return *this; |
| 792 | } |
| 793 | |
| 794 | char wxInputStream::Peek() |
| 795 | { |
| 796 | char c; |
| 797 | Read(&c, 1); |
| 798 | if (m_lasterror == wxStream_NOERROR) |
| 799 | { |
| 800 | Ungetch(c); |
| 801 | return c; |
| 802 | } |
| 803 | |
| 804 | return 0; |
| 805 | } |
| 806 | |
| 807 | wxInputStream& wxInputStream::Read(wxOutputStream& stream_out) |
| 808 | { |
| 809 | char buf[BUF_TEMP_SIZE]; |
| 810 | size_t bytes_read = BUF_TEMP_SIZE; |
| 811 | |
| 812 | while (bytes_read == BUF_TEMP_SIZE) |
| 813 | { |
| 814 | bytes_read = Read(buf, bytes_read).LastRead(); |
| 815 | bytes_read = stream_out.Write(buf, bytes_read).LastWrite(); |
| 816 | } |
| 817 | return *this; |
| 818 | } |
| 819 | |
| 820 | off_t wxInputStream::SeekI(off_t pos, wxSeekMode mode) |
| 821 | { |
| 822 | /* Should be check and improve, just to remove a slight bug ! |
| 823 | I don't know whether it should be put as well in wxFileInputStream::OnSysSeek ? */ |
| 824 | if (m_lasterror==wxSTREAM_EOF) |
| 825 | m_lasterror=wxSTREAM_NOERROR; |
| 826 | |
| 827 | /* A call to SeekI() will automatically invalidate any previous call |
| 828 | to Ungetch(), otherwise it would be possible to SeekI() to one |
| 829 | one position, unread some bytes there, SeekI() to another position |
| 830 | and the data would be corrupted. |
| 831 | |
| 832 | GRG: Could add code here to try to navigate within the wback |
| 833 | buffer if possible, but is it really needed? It would only work |
| 834 | when seeking in wxFromCurrent mode, else it would invalidate |
| 835 | anyway... |
| 836 | */ |
| 837 | if (m_wback) |
| 838 | { |
| 839 | free(m_wback); |
| 840 | m_wback = NULL; |
| 841 | m_wbacksize = 0; |
| 842 | m_wbackcur = 0; |
| 843 | } |
| 844 | |
| 845 | return OnSysSeek(pos, mode); |
| 846 | } |
| 847 | |
| 848 | off_t wxInputStream::TellI() const |
| 849 | { |
| 850 | /* GRG: Changed to make it compatible with the wback buffer */ |
| 851 | off_t pos = OnSysTell(); |
| 852 | |
| 853 | if (pos != wxInvalidOffset) |
| 854 | pos -= (m_wbacksize - m_wbackcur); |
| 855 | |
| 856 | return pos; |
| 857 | } |
| 858 | |
| 859 | |
| 860 | // ---------------------------------------------------------------------------- |
| 861 | // wxOutputStream |
| 862 | // ---------------------------------------------------------------------------- |
| 863 | |
| 864 | wxOutputStream::wxOutputStream() |
| 865 | { |
| 866 | } |
| 867 | |
| 868 | wxOutputStream::~wxOutputStream() |
| 869 | { |
| 870 | } |
| 871 | |
| 872 | size_t wxOutputStream::OnSysWrite(const void * WXUNUSED(buffer), |
| 873 | size_t WXUNUSED(bufsize)) |
| 874 | { |
| 875 | return 0; |
| 876 | } |
| 877 | |
| 878 | void wxOutputStream::PutC(char c) |
| 879 | { |
| 880 | Write(&c, 1); |
| 881 | } |
| 882 | |
| 883 | wxOutputStream& wxOutputStream::Write(const void *buffer, size_t size) |
| 884 | { |
| 885 | m_lastcount = OnSysWrite(buffer, size); |
| 886 | return *this; |
| 887 | } |
| 888 | |
| 889 | wxOutputStream& wxOutputStream::Write(wxInputStream& stream_in) |
| 890 | { |
| 891 | stream_in.Read(*this); |
| 892 | return *this; |
| 893 | } |
| 894 | |
| 895 | off_t wxOutputStream::TellO() const |
| 896 | { |
| 897 | return OnSysTell(); |
| 898 | } |
| 899 | |
| 900 | off_t wxOutputStream::SeekO(off_t pos, wxSeekMode mode) |
| 901 | { |
| 902 | return OnSysSeek(pos, mode); |
| 903 | } |
| 904 | |
| 905 | void wxOutputStream::Sync() |
| 906 | { |
| 907 | } |
| 908 | |
| 909 | |
| 910 | // ---------------------------------------------------------------------------- |
| 911 | // wxCountingOutputStream |
| 912 | // ---------------------------------------------------------------------------- |
| 913 | |
| 914 | wxCountingOutputStream::wxCountingOutputStream () |
| 915 | { |
| 916 | m_currentPos = 0; |
| 917 | } |
| 918 | |
| 919 | size_t wxCountingOutputStream::GetSize() const |
| 920 | { |
| 921 | return m_lastcount; |
| 922 | } |
| 923 | |
| 924 | size_t wxCountingOutputStream::OnSysWrite(const void *WXUNUSED(buffer), |
| 925 | size_t size) |
| 926 | { |
| 927 | m_currentPos += size; |
| 928 | if (m_currentPos > m_lastcount) |
| 929 | m_lastcount = m_currentPos; |
| 930 | |
| 931 | return m_currentPos; |
| 932 | } |
| 933 | |
| 934 | off_t wxCountingOutputStream::OnSysSeek(off_t pos, wxSeekMode mode) |
| 935 | { |
| 936 | switch ( mode ) |
| 937 | { |
| 938 | case wxFromStart: |
| 939 | m_currentPos = pos; |
| 940 | break; |
| 941 | |
| 942 | case wxFromEnd: |
| 943 | m_currentPos = m_lastcount + pos; |
| 944 | break; |
| 945 | |
| 946 | case wxFromCurrent: |
| 947 | m_currentPos += pos; |
| 948 | break; |
| 949 | |
| 950 | default: |
| 951 | wxFAIL_MSG( _T("invalid seek mode") ); |
| 952 | return wxInvalidOffset; |
| 953 | } |
| 954 | |
| 955 | if (m_currentPos > m_lastcount) |
| 956 | m_lastcount = m_currentPos; |
| 957 | |
| 958 | return m_currentPos; |
| 959 | } |
| 960 | |
| 961 | off_t wxCountingOutputStream::OnSysTell() const |
| 962 | { |
| 963 | return m_currentPos; |
| 964 | } |
| 965 | |
| 966 | // ---------------------------------------------------------------------------- |
| 967 | // wxFilterInputStream |
| 968 | // ---------------------------------------------------------------------------- |
| 969 | |
| 970 | wxFilterInputStream::wxFilterInputStream() |
| 971 | { |
| 972 | m_parent_i_stream = NULL; |
| 973 | } |
| 974 | |
| 975 | wxFilterInputStream::wxFilterInputStream(wxInputStream& stream) |
| 976 | { |
| 977 | m_parent_i_stream = &stream; |
| 978 | } |
| 979 | |
| 980 | wxFilterInputStream::~wxFilterInputStream() |
| 981 | { |
| 982 | } |
| 983 | |
| 984 | // ---------------------------------------------------------------------------- |
| 985 | // wxFilterOutputStream |
| 986 | // ---------------------------------------------------------------------------- |
| 987 | |
| 988 | wxFilterOutputStream::wxFilterOutputStream() |
| 989 | { |
| 990 | m_parent_o_stream = NULL; |
| 991 | } |
| 992 | |
| 993 | wxFilterOutputStream::wxFilterOutputStream(wxOutputStream& stream) |
| 994 | { |
| 995 | m_parent_o_stream = &stream; |
| 996 | } |
| 997 | |
| 998 | wxFilterOutputStream::~wxFilterOutputStream() |
| 999 | { |
| 1000 | } |
| 1001 | |
| 1002 | // ---------------------------------------------------------------------------- |
| 1003 | // wxBufferedInputStream |
| 1004 | // ---------------------------------------------------------------------------- |
| 1005 | |
| 1006 | wxBufferedInputStream::wxBufferedInputStream(wxInputStream& s, |
| 1007 | wxStreamBuffer *buffer) |
| 1008 | : wxFilterInputStream(s) |
| 1009 | { |
| 1010 | if ( buffer ) |
| 1011 | { |
| 1012 | // use the buffer provided by the user |
| 1013 | m_i_streambuf = buffer; |
| 1014 | } |
| 1015 | else // create a default buffer |
| 1016 | { |
| 1017 | m_i_streambuf = new wxStreamBuffer(*this, wxStreamBuffer::read); |
| 1018 | |
| 1019 | m_i_streambuf->SetBufferIO(1024); |
| 1020 | } |
| 1021 | } |
| 1022 | |
| 1023 | wxBufferedInputStream::~wxBufferedInputStream() |
| 1024 | { |
| 1025 | m_parent_i_stream->SeekI(-(off_t)m_i_streambuf->GetBytesLeft(), |
| 1026 | wxFromCurrent); |
| 1027 | |
| 1028 | delete m_i_streambuf; |
| 1029 | } |
| 1030 | |
| 1031 | char wxBufferedInputStream::Peek() |
| 1032 | { |
| 1033 | return m_i_streambuf->Peek(); |
| 1034 | } |
| 1035 | |
| 1036 | wxInputStream& wxBufferedInputStream::Read(void *buf, size_t size) |
| 1037 | { |
| 1038 | // reset the error flag |
| 1039 | m_lasterror = wxStream_NOERROR; |
| 1040 | |
| 1041 | // first read from the already cached data |
| 1042 | m_lastcount = GetWBack(buf, size); |
| 1043 | |
| 1044 | // do we have to read anything more? |
| 1045 | if ( m_lastcount < size ) |
| 1046 | { |
| 1047 | size -= m_lastcount; |
| 1048 | buf = (char *)buf + m_lastcount; |
| 1049 | |
| 1050 | // the call to wxStreamBuffer::Read() below will reset our m_lastcount, |
| 1051 | // so save it |
| 1052 | size_t countOld = m_lastcount; |
| 1053 | |
| 1054 | m_i_streambuf->Read(buf, size); |
| 1055 | |
| 1056 | m_lastcount += countOld; |
| 1057 | } |
| 1058 | |
| 1059 | return *this; |
| 1060 | } |
| 1061 | |
| 1062 | off_t wxBufferedInputStream::SeekI(off_t pos, wxSeekMode mode) |
| 1063 | { |
| 1064 | return m_i_streambuf->Seek(pos, mode); |
| 1065 | } |
| 1066 | |
| 1067 | off_t wxBufferedInputStream::TellI() const |
| 1068 | { |
| 1069 | return m_i_streambuf->Tell(); |
| 1070 | } |
| 1071 | |
| 1072 | size_t wxBufferedInputStream::OnSysRead(void *buffer, size_t bufsize) |
| 1073 | { |
| 1074 | return m_parent_i_stream->Read(buffer, bufsize).LastRead(); |
| 1075 | } |
| 1076 | |
| 1077 | off_t wxBufferedInputStream::OnSysSeek(off_t seek, wxSeekMode mode) |
| 1078 | { |
| 1079 | return m_parent_i_stream->SeekI(seek, mode); |
| 1080 | } |
| 1081 | |
| 1082 | off_t wxBufferedInputStream::OnSysTell() const |
| 1083 | { |
| 1084 | return m_parent_i_stream->TellI(); |
| 1085 | } |
| 1086 | |
| 1087 | void wxBufferedInputStream::SetInputStreamBuffer(wxStreamBuffer *buffer) |
| 1088 | { |
| 1089 | wxCHECK_RET( buffer, _T("wxBufferedInputStream needs buffer") ); |
| 1090 | |
| 1091 | delete m_i_streambuf; |
| 1092 | m_i_streambuf = buffer; |
| 1093 | } |
| 1094 | |
| 1095 | // ---------------------------------------------------------------------------- |
| 1096 | // wxBufferedOutputStream |
| 1097 | // ---------------------------------------------------------------------------- |
| 1098 | |
| 1099 | wxBufferedOutputStream::wxBufferedOutputStream(wxOutputStream& s, |
| 1100 | wxStreamBuffer *buffer) |
| 1101 | : wxFilterOutputStream(s) |
| 1102 | { |
| 1103 | if ( buffer ) |
| 1104 | { |
| 1105 | m_o_streambuf = buffer; |
| 1106 | } |
| 1107 | else // create a default one |
| 1108 | { |
| 1109 | m_o_streambuf = new wxStreamBuffer(*this, wxStreamBuffer::write); |
| 1110 | |
| 1111 | m_o_streambuf->SetBufferIO(1024); |
| 1112 | } |
| 1113 | } |
| 1114 | |
| 1115 | wxBufferedOutputStream::~wxBufferedOutputStream() |
| 1116 | { |
| 1117 | Sync(); |
| 1118 | delete m_o_streambuf; |
| 1119 | } |
| 1120 | |
| 1121 | wxOutputStream& wxBufferedOutputStream::Write(const void *buffer, size_t size) |
| 1122 | { |
| 1123 | m_lastcount = 0; |
| 1124 | m_o_streambuf->Write(buffer, size); |
| 1125 | return *this; |
| 1126 | } |
| 1127 | |
| 1128 | off_t wxBufferedOutputStream::SeekO(off_t pos, wxSeekMode mode) |
| 1129 | { |
| 1130 | Sync(); |
| 1131 | return m_o_streambuf->Seek(pos, mode); |
| 1132 | } |
| 1133 | |
| 1134 | off_t wxBufferedOutputStream::TellO() const |
| 1135 | { |
| 1136 | return m_o_streambuf->Tell(); |
| 1137 | } |
| 1138 | |
| 1139 | void wxBufferedOutputStream::Sync() |
| 1140 | { |
| 1141 | m_o_streambuf->FlushBuffer(); |
| 1142 | m_parent_o_stream->Sync(); |
| 1143 | } |
| 1144 | |
| 1145 | size_t wxBufferedOutputStream::OnSysWrite(const void *buffer, size_t bufsize) |
| 1146 | { |
| 1147 | return m_parent_o_stream->Write(buffer, bufsize).LastWrite(); |
| 1148 | } |
| 1149 | |
| 1150 | off_t wxBufferedOutputStream::OnSysSeek(off_t seek, wxSeekMode mode) |
| 1151 | { |
| 1152 | return m_parent_o_stream->SeekO(seek, mode); |
| 1153 | } |
| 1154 | |
| 1155 | off_t wxBufferedOutputStream::OnSysTell() const |
| 1156 | { |
| 1157 | return m_parent_o_stream->TellO(); |
| 1158 | } |
| 1159 | |
| 1160 | size_t wxBufferedOutputStream::GetSize() const |
| 1161 | { |
| 1162 | return m_parent_o_stream->GetSize() + m_o_streambuf->GetIntPosition(); |
| 1163 | } |
| 1164 | |
| 1165 | void wxBufferedOutputStream::SetOutputStreamBuffer(wxStreamBuffer *buffer) |
| 1166 | { |
| 1167 | wxCHECK_RET( buffer, _T("wxBufferedOutputStream needs buffer") ); |
| 1168 | |
| 1169 | delete m_o_streambuf; |
| 1170 | m_o_streambuf = buffer; |
| 1171 | } |
| 1172 | |
| 1173 | // ---------------------------------------------------------------------------- |
| 1174 | // Some IOManip function |
| 1175 | // ---------------------------------------------------------------------------- |
| 1176 | |
| 1177 | wxOutputStream& wxEndL(wxOutputStream& stream) |
| 1178 | { |
| 1179 | static const wxChar *eol = wxTextFile::GetEOL(); |
| 1180 | |
| 1181 | return stream.Write(eol, wxStrlen(eol)); |
| 1182 | } |
| 1183 | |
| 1184 | #endif |
| 1185 | // wxUSE_STREAMS |