| File: | usr/include/wx-3.2/wx/buffer.h |
| Warning: | line 281, column 59 the computation of the size of the memory allocation may overflow |
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| 1 | /////////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: wx/buffer.h |
| 3 | // Purpose: auto buffer classes: buffers which automatically free memory |
| 4 | // Author: Vadim Zeitlin |
| 5 | // Modified by: |
| 6 | // Created: 12.04.99 |
| 7 | // Copyright: (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr> |
| 8 | // Licence: wxWindows licence |
| 9 | /////////////////////////////////////////////////////////////////////////////// |
| 10 | |
| 11 | #ifndef _WX_BUFFER_H |
| 12 | #define _WX_BUFFER_H |
| 13 | |
| 14 | #include "wx/defs.h" |
| 15 | #include "wx/wxcrtbase.h" |
| 16 | |
| 17 | #include <stdlib.h> // malloc() and free() |
| 18 | |
| 19 | class WXDLLIMPEXP_FWD_BASE wxCStrData; |
| 20 | |
| 21 | // ---------------------------------------------------------------------------- |
| 22 | // Special classes for (wide) character strings: they use malloc/free instead |
| 23 | // of new/delete |
| 24 | // ---------------------------------------------------------------------------- |
| 25 | |
| 26 | // helpers used by wxCharTypeBuffer |
| 27 | namespace wxPrivate |
| 28 | { |
| 29 | |
| 30 | struct UntypedBufferData |
| 31 | { |
| 32 | enum Kind |
| 33 | { |
| 34 | Owned, |
| 35 | NonOwned |
| 36 | }; |
| 37 | |
| 38 | UntypedBufferData(void *str, size_t len, Kind kind = Owned) |
| 39 | : m_str(str), m_length(len), m_ref(1), m_owned(kind == Owned) {} |
| 40 | |
| 41 | ~UntypedBufferData() |
| 42 | { |
| 43 | if ( m_owned ) |
| 44 | free(m_str); |
| 45 | } |
| 46 | |
| 47 | void *m_str; |
| 48 | size_t m_length; |
| 49 | |
| 50 | // "short" to have sizeof(Data)=12 on 32bit archs |
| 51 | unsigned short m_ref; |
| 52 | |
| 53 | bool m_owned; |
| 54 | }; |
| 55 | |
| 56 | // NB: this is defined in string.cpp and not the (non-existent) buffer.cpp |
| 57 | WXDLLIMPEXP_BASE__attribute__ ((visibility("default"))) UntypedBufferData * GetUntypedNullData(); |
| 58 | |
| 59 | } // namespace wxPrivate |
| 60 | |
| 61 | |
| 62 | // Reference-counted character buffer for storing string data. The buffer |
| 63 | // is only valid for as long as the "parent" object that provided the data |
| 64 | // is valid; see wxCharTypeBuffer<T> for persistent variant. |
| 65 | template <typename T> |
| 66 | class wxScopedCharTypeBuffer |
| 67 | { |
| 68 | public: |
| 69 | typedef T CharType; |
| 70 | |
| 71 | wxScopedCharTypeBuffer() |
| 72 | { |
| 73 | m_data = GetNullData(); |
| 74 | } |
| 75 | |
| 76 | // Creates "non-owned" buffer, i.e. 'str' is not owned by the buffer |
| 77 | // and doesn't get freed by dtor. Used e.g. to point to wxString's internal |
| 78 | // storage. |
| 79 | static |
| 80 | const wxScopedCharTypeBuffer CreateNonOwned(const CharType *str, |
| 81 | size_t len = wxNO_LEN((size_t)-1)) |
| 82 | { |
| 83 | if ( len == wxNO_LEN((size_t)-1) ) |
| 84 | len = wxStrlen(str); |
| 85 | |
| 86 | wxScopedCharTypeBuffer buf; |
| 87 | if ( str ) |
| 88 | buf.m_data = new Data(const_cast<CharType*>(str), len, Data::NonOwned); |
| 89 | return buf; |
| 90 | } |
| 91 | |
| 92 | // Creates "owned" buffer, i.e. takes over ownership of 'str' and frees it |
| 93 | // in dtor (if ref.count reaches 0). |
| 94 | static |
| 95 | const wxScopedCharTypeBuffer CreateOwned(CharType *str, |
| 96 | size_t len = wxNO_LEN((size_t)-1) ) |
| 97 | { |
| 98 | if ( len == wxNO_LEN((size_t)-1) ) |
| 99 | len = wxStrlen(str); |
| 100 | |
| 101 | wxScopedCharTypeBuffer buf; |
| 102 | if ( str ) |
| 103 | buf.m_data = new Data(str, len); |
| 104 | return buf; |
| 105 | } |
| 106 | |
| 107 | wxScopedCharTypeBuffer(const wxScopedCharTypeBuffer& src) |
| 108 | { |
| 109 | m_data = src.m_data; |
| 110 | IncRef(); |
| 111 | } |
| 112 | |
| 113 | wxScopedCharTypeBuffer& operator=(const wxScopedCharTypeBuffer& src) |
| 114 | { |
| 115 | if ( &src == this ) |
| 116 | return *this; |
| 117 | |
| 118 | DecRef(); |
| 119 | m_data = src.m_data; |
| 120 | IncRef(); |
| 121 | |
| 122 | return *this; |
| 123 | } |
| 124 | |
| 125 | ~wxScopedCharTypeBuffer() |
| 126 | { |
| 127 | DecRef(); |
| 128 | } |
| 129 | |
| 130 | // NB: this method is only const for backward compatibility. It used to |
| 131 | // be needed for auto_ptr-like semantics of the copy ctor, but now |
| 132 | // that ref-counting is used, it's not really needed. |
| 133 | CharType *release() const |
| 134 | { |
| 135 | if ( m_data == GetNullData() ) |
| 136 | return NULL__null; |
| 137 | |
| 138 | wxASSERT_MSG( m_data->m_owned, wxT("can't release non-owned buffer") )do { if ( m_data->m_owned ) { } else if ( wxTheAssertHandler && (wxOnAssert("/usr/include/wx-3.2/wx/buffer.h", 138 , __FUNCTION__, "m_data->m_owned", L"can't release non-owned buffer" ), wxTrapInAssert) ) { wxTrapInAssert = false; asm volatile ( "int $3"); } } while ( (void)0, 0 ); |
| 139 | wxASSERT_MSG( m_data->m_ref == 1, wxT("can't release shared buffer") )do { if ( m_data->m_ref == 1 ) { } else if ( wxTheAssertHandler && (wxOnAssert("/usr/include/wx-3.2/wx/buffer.h", 139 , __FUNCTION__, "m_data->m_ref == 1", L"can't release shared buffer" ), wxTrapInAssert) ) { wxTrapInAssert = false; asm volatile ( "int $3"); } } while ( (void)0, 0 ); |
| 140 | |
| 141 | CharType * const p = m_data->Get(); |
| 142 | |
| 143 | wxScopedCharTypeBuffer *self = const_cast<wxScopedCharTypeBuffer*>(this); |
| 144 | self->m_data->Set(NULL__null, 0); |
| 145 | self->DecRef(); |
| 146 | |
| 147 | return p; |
| 148 | } |
| 149 | |
| 150 | void reset() |
| 151 | { |
| 152 | DecRef(); |
| 153 | } |
| 154 | |
| 155 | // For some reasong clang-tidy gives a warning about using freed memory |
| 156 | // here even when this is not at all the case, seemingly because it doesn't |
| 157 | // follow reference counting logic, i.e. it assumes that it's possible to |
| 158 | // delete the data even when it's still referenced. |
| 159 | // |
| 160 | // Suppress the warning as it's extremely annoying to get it for every use |
| 161 | // of wxCharBuffer. |
| 162 | // |
| 163 | // NOLINTNEXTLINE(clang-analyzer-cplusplus.NewDelete) |
| 164 | CharType *data() { return m_data->Get(); } |
| 165 | // NOLINTNEXTLINE(clang-analyzer-cplusplus.NewDelete) |
| 166 | const CharType *data() const { return m_data->Get(); } |
| 167 | operator const CharType *() const { return data(); } |
| 168 | CharType operator[](size_t n) const { return data()[n]; } |
| 169 | |
| 170 | size_t length() const { return m_data->m_length; } |
| 171 | |
| 172 | protected: |
| 173 | // reference-counted data |
| 174 | struct Data : public wxPrivate::UntypedBufferData |
| 175 | { |
| 176 | Data(CharType *str, size_t len, Kind kind = Owned) |
| 177 | : wxPrivate::UntypedBufferData(str, len, kind) |
| 178 | { |
| 179 | } |
| 180 | |
| 181 | CharType *Get() const { return static_cast<CharType *>(m_str); } |
| 182 | void Set(CharType *str, size_t len) |
| 183 | { |
| 184 | m_str = str; |
| 185 | m_length = len; |
| 186 | } |
| 187 | }; |
| 188 | |
| 189 | // placeholder for NULL string, to simplify this code |
| 190 | static Data *GetNullData() |
| 191 | { |
| 192 | return static_cast<Data *>(wxPrivate::GetUntypedNullData()); |
| 193 | } |
| 194 | |
| 195 | void IncRef() |
| 196 | { |
| 197 | if ( m_data == GetNullData() ) // exception, not ref-counted |
| 198 | return; |
| 199 | m_data->m_ref++; |
| 200 | } |
| 201 | |
| 202 | void DecRef() |
| 203 | { |
| 204 | if ( m_data == GetNullData() ) // exception, not ref-counted |
| 205 | return; |
| 206 | if ( --m_data->m_ref == 0 ) |
| 207 | delete m_data; |
| 208 | m_data = GetNullData(); |
| 209 | } |
| 210 | |
| 211 | // sets this object to a be copy of 'other'; if 'src' is non-owned, |
| 212 | // a deep copy is made and 'this' will contain new instance of the data |
| 213 | void MakeOwnedCopyOf(const wxScopedCharTypeBuffer& src) |
| 214 | { |
| 215 | this->DecRef(); |
| 216 | |
| 217 | if ( src.m_data == this->GetNullData() ) |
| 218 | { |
| 219 | this->m_data = this->GetNullData(); |
| 220 | } |
| 221 | else if ( src.m_data->m_owned ) |
| 222 | { |
| 223 | this->m_data = src.m_data; |
| 224 | this->IncRef(); |
| 225 | } |
| 226 | else |
| 227 | { |
| 228 | // if the scoped buffer had non-owned data, we have to make |
| 229 | // a copy here, because src.m_data->m_str is valid only for as long |
| 230 | // as 'src' exists |
| 231 | this->m_data = new Data |
| 232 | ( |
| 233 | StrCopy(src.data(), src.length()), |
| 234 | src.length() |
| 235 | ); |
| 236 | } |
| 237 | } |
| 238 | |
| 239 | static CharType *StrCopy(const CharType *src, size_t len) |
| 240 | { |
| 241 | CharType *dst = (CharType*)malloc(sizeof(CharType) * (len + 1)); |
| 242 | if ( dst ) |
| 243 | memcpy(dst, src, sizeof(CharType) * (len + 1)); |
| 244 | return dst; |
| 245 | } |
| 246 | |
| 247 | protected: |
| 248 | Data *m_data; |
| 249 | }; |
| 250 | |
| 251 | typedef wxScopedCharTypeBuffer<char> wxScopedCharBuffer; |
| 252 | typedef wxScopedCharTypeBuffer<wchar_t> wxScopedWCharBuffer; |
| 253 | |
| 254 | |
| 255 | // this buffer class always stores data in "owned" (persistent) manner |
| 256 | template <typename T> |
| 257 | class wxCharTypeBuffer : public wxScopedCharTypeBuffer<T> |
| 258 | { |
| 259 | protected: |
| 260 | typedef typename wxScopedCharTypeBuffer<T>::Data Data; |
| 261 | |
| 262 | public: |
| 263 | typedef T CharType; |
| 264 | |
| 265 | wxCharTypeBuffer(const CharType *str = NULL__null, size_t len = wxNO_LEN((size_t)-1)) |
| 266 | { |
| 267 | if ( str ) |
| 268 | { |
| 269 | if ( len == wxNO_LEN((size_t)-1) ) |
| 270 | len = wxStrlen(str); |
| 271 | this->m_data = new Data(this->StrCopy(str, len), len); |
| 272 | } |
| 273 | else |
| 274 | { |
| 275 | this->m_data = this->GetNullData(); |
| 276 | } |
| 277 | } |
| 278 | |
| 279 | wxCharTypeBuffer(size_t len) |
| 280 | { |
| 281 | CharType* const str = (CharType *)malloc((len + 1)*sizeof(CharType)); |
the computation of the size of the memory allocation may overflow | |
| 282 | if ( str ) |
| 283 | { |
| 284 | str[len] = (CharType)0; |
| 285 | |
| 286 | // There is a potential memory leak here if new throws because it |
| 287 | // fails to allocate Data, we ought to use new(nothrow) here, but |
| 288 | // this might fail to compile under some platforms so until this |
| 289 | // can be fully tested, just live with this (rather unlikely, as |
| 290 | // Data is a small object) potential leak. |
| 291 | this->m_data = new Data(str, len); |
| 292 | } |
| 293 | else |
| 294 | { |
| 295 | this->m_data = this->GetNullData(); |
| 296 | } |
| 297 | } |
| 298 | |
| 299 | wxCharTypeBuffer(const wxCharTypeBuffer& src) |
| 300 | : wxScopedCharTypeBuffer<T>(src) {} |
| 301 | |
| 302 | wxCharTypeBuffer& operator=(const CharType *str) |
| 303 | { |
| 304 | this->DecRef(); |
| 305 | |
| 306 | if ( str ) |
| 307 | this->m_data = new Data(wxStrdup(str), wxStrlen(str)); |
| 308 | return *this; |
| 309 | } |
| 310 | |
| 311 | wxCharTypeBuffer& operator=(const wxCharTypeBuffer& src) |
| 312 | { |
| 313 | wxScopedCharTypeBuffer<T>::operator=(src); |
| 314 | return *this; |
| 315 | } |
| 316 | |
| 317 | wxCharTypeBuffer(const wxScopedCharTypeBuffer<T>& src) |
| 318 | { |
| 319 | this->MakeOwnedCopyOf(src); |
| 320 | } |
| 321 | |
| 322 | wxCharTypeBuffer& operator=(const wxScopedCharTypeBuffer<T>& src) |
| 323 | { |
| 324 | MakeOwnedCopyOf(src); |
| 325 | return *this; |
| 326 | } |
| 327 | |
| 328 | bool extend(size_t len) |
| 329 | { |
| 330 | wxASSERT_MSG( this->m_data->m_owned, "cannot extend non-owned buffer" )do { if ( this->m_data->m_owned ) { } else if ( wxTheAssertHandler && (wxOnAssert("/usr/include/wx-3.2/wx/buffer.h", 330 , __FUNCTION__, "this->m_data->m_owned", "cannot extend non-owned buffer" ), wxTrapInAssert) ) { wxTrapInAssert = false; asm volatile ( "int $3"); } } while ( (void)0, 0 ); |
| 331 | wxASSERT_MSG( this->m_data->m_ref == 1, "can't extend shared buffer" )do { if ( this->m_data->m_ref == 1 ) { } else if ( wxTheAssertHandler && (wxOnAssert("/usr/include/wx-3.2/wx/buffer.h", 331 , __FUNCTION__, "this->m_data->m_ref == 1", "can't extend shared buffer" ), wxTrapInAssert) ) { wxTrapInAssert = false; asm volatile ( "int $3"); } } while ( (void)0, 0 ); |
| 332 | |
| 333 | CharType *str = |
| 334 | (CharType *)realloc(this->data(), (len + 1) * sizeof(CharType)); |
| 335 | if ( !str ) |
| 336 | return false; |
| 337 | |
| 338 | // For consistency with the ctor taking just the length, NUL-terminate |
| 339 | // the buffer. |
| 340 | str[len] = (CharType)0; |
| 341 | |
| 342 | if ( this->m_data == this->GetNullData() ) |
| 343 | { |
| 344 | this->m_data = new Data(str, len); |
| 345 | } |
| 346 | else |
| 347 | { |
| 348 | this->m_data->Set(str, len); |
| 349 | this->m_data->m_owned = true; |
| 350 | } |
| 351 | |
| 352 | return true; |
| 353 | } |
| 354 | |
| 355 | void shrink(size_t len) |
| 356 | { |
| 357 | wxASSERT_MSG( this->m_data->m_owned, "cannot shrink non-owned buffer" )do { if ( this->m_data->m_owned ) { } else if ( wxTheAssertHandler && (wxOnAssert("/usr/include/wx-3.2/wx/buffer.h", 357 , __FUNCTION__, "this->m_data->m_owned", "cannot shrink non-owned buffer" ), wxTrapInAssert) ) { wxTrapInAssert = false; asm volatile ( "int $3"); } } while ( (void)0, 0 ); |
| 358 | wxASSERT_MSG( this->m_data->m_ref == 1, "can't shrink shared buffer" )do { if ( this->m_data->m_ref == 1 ) { } else if ( wxTheAssertHandler && (wxOnAssert("/usr/include/wx-3.2/wx/buffer.h", 358 , __FUNCTION__, "this->m_data->m_ref == 1", "can't shrink shared buffer" ), wxTrapInAssert) ) { wxTrapInAssert = false; asm volatile ( "int $3"); } } while ( (void)0, 0 ); |
| 359 | |
| 360 | wxASSERT( len <= this->length() )do { if ( len <= this->length() ) { } else if ( wxTheAssertHandler && (wxOnAssert("/usr/include/wx-3.2/wx/buffer.h", 360 , __FUNCTION__, "len <= this->length()", (const char*)__null ), wxTrapInAssert) ) { wxTrapInAssert = false; asm volatile ( "int $3"); } } while ( (void)0, 0 ); |
| 361 | |
| 362 | this->m_data->m_length = len; |
| 363 | this->data()[len] = 0; |
| 364 | } |
| 365 | }; |
| 366 | |
| 367 | class wxCharBuffer : public wxCharTypeBuffer<char> |
| 368 | { |
| 369 | public: |
| 370 | typedef wxCharTypeBuffer<char> wxCharTypeBufferBase; |
| 371 | typedef wxScopedCharTypeBuffer<char> wxScopedCharTypeBufferBase; |
| 372 | |
| 373 | wxCharBuffer(const wxCharTypeBufferBase& buf) |
| 374 | : wxCharTypeBufferBase(buf) {} |
| 375 | wxCharBuffer(const wxScopedCharTypeBufferBase& buf) |
| 376 | : wxCharTypeBufferBase(buf) {} |
| 377 | |
| 378 | wxCharBuffer(const CharType *str = NULL__null) : wxCharTypeBufferBase(str) {} |
| 379 | wxCharBuffer(size_t len) : wxCharTypeBufferBase(len) {} |
| 380 | |
| 381 | wxCharBuffer(const wxCStrData& cstr); |
| 382 | }; |
| 383 | |
| 384 | class wxWCharBuffer : public wxCharTypeBuffer<wchar_t> |
| 385 | { |
| 386 | public: |
| 387 | typedef wxCharTypeBuffer<wchar_t> wxCharTypeBufferBase; |
| 388 | typedef wxScopedCharTypeBuffer<wchar_t> wxScopedCharTypeBufferBase; |
| 389 | |
| 390 | wxWCharBuffer(const wxCharTypeBufferBase& buf) |
| 391 | : wxCharTypeBufferBase(buf) {} |
| 392 | wxWCharBuffer(const wxScopedCharTypeBufferBase& buf) |
| 393 | : wxCharTypeBufferBase(buf) {} |
| 394 | |
| 395 | wxWCharBuffer(const CharType *str = NULL__null) : wxCharTypeBufferBase(str) {} |
| 396 | wxWCharBuffer(size_t len) : wxCharTypeBufferBase(len) {} |
| 397 | |
| 398 | wxWCharBuffer(const wxCStrData& cstr); |
| 399 | }; |
| 400 | |
| 401 | // wxCharTypeBuffer<T> implicitly convertible to T* |
| 402 | template <typename T> |
| 403 | class wxWritableCharTypeBuffer : public wxCharTypeBuffer<T> |
| 404 | { |
| 405 | public: |
| 406 | typedef typename wxScopedCharTypeBuffer<T>::CharType CharType; |
| 407 | |
| 408 | wxWritableCharTypeBuffer(const wxScopedCharTypeBuffer<T>& src) |
| 409 | : wxCharTypeBuffer<T>(src) {} |
| 410 | // FIXME-UTF8: this won't be needed after converting mb_str()/wc_str() to |
| 411 | // always return a buffer |
| 412 | // + we should derive this class from wxScopedCharTypeBuffer |
| 413 | // then |
| 414 | wxWritableCharTypeBuffer(const CharType *str = NULL__null) |
| 415 | : wxCharTypeBuffer<T>(str) {} |
| 416 | |
| 417 | operator CharType*() { return this->data(); } |
| 418 | }; |
| 419 | |
| 420 | typedef wxWritableCharTypeBuffer<char> wxWritableCharBuffer; |
| 421 | typedef wxWritableCharTypeBuffer<wchar_t> wxWritableWCharBuffer; |
| 422 | |
| 423 | |
| 424 | #if wxUSE_UNICODE1 |
| 425 | #define wxWxCharBufferwxWCharBuffer wxWCharBuffer |
| 426 | |
| 427 | #define wxMB2WXbufwxWCharBuffer wxWCharBuffer |
| 428 | #define wxWX2MBbufwxCharBuffer wxCharBuffer |
| 429 | #if wxUSE_UNICODE_WCHAR1 |
| 430 | #define wxWC2WXbufwxChar* wxChar* |
| 431 | #define wxWX2WCbufwxChar* wxChar* |
| 432 | #elif wxUSE_UNICODE_UTF80 |
| 433 | #define wxWC2WXbufwxChar* wxWCharBuffer |
| 434 | #define wxWX2WCbufwxChar* wxWCharBuffer |
| 435 | #endif |
| 436 | #else // ANSI |
| 437 | #define wxWxCharBufferwxWCharBuffer wxCharBuffer |
| 438 | |
| 439 | #define wxMB2WXbufwxWCharBuffer wxChar* |
| 440 | #define wxWX2MBbufwxCharBuffer wxChar* |
| 441 | #define wxWC2WXbufwxChar* wxCharBuffer |
| 442 | #define wxWX2WCbufwxChar* wxWCharBuffer |
| 443 | #endif // Unicode/ANSI |
| 444 | |
| 445 | // ---------------------------------------------------------------------------- |
| 446 | // A class for holding growable data buffers (not necessarily strings) |
| 447 | // ---------------------------------------------------------------------------- |
| 448 | |
| 449 | // This class manages the actual data buffer pointer and is ref-counted. |
| 450 | class wxMemoryBufferData |
| 451 | { |
| 452 | public: |
| 453 | // the initial size and also the size added by ResizeIfNeeded() |
| 454 | enum { DefBufSize = 1024 }; |
| 455 | |
| 456 | friend class wxMemoryBuffer; |
| 457 | |
| 458 | // everything is private as it can only be used by wxMemoryBuffer |
| 459 | private: |
| 460 | wxMemoryBufferData(size_t size = wxMemoryBufferData::DefBufSize) |
| 461 | : m_data(size ? malloc(size) : NULL__null), m_size(size), m_len(0), m_ref(0) |
| 462 | { |
| 463 | } |
| 464 | ~wxMemoryBufferData() { free(m_data); } |
| 465 | |
| 466 | |
| 467 | void ResizeIfNeeded(size_t newSize) |
| 468 | { |
| 469 | if (newSize > m_size) |
| 470 | { |
| 471 | void* const data = realloc(m_data, newSize + wxMemoryBufferData::DefBufSize); |
| 472 | if ( !data ) |
| 473 | { |
| 474 | // It's better to crash immediately dereferencing a null |
| 475 | // pointer in the function calling us than overflowing the |
| 476 | // buffer which couldn't be made big enough. |
| 477 | free(release()); |
| 478 | return; |
| 479 | } |
| 480 | |
| 481 | m_data = data; |
| 482 | m_size = newSize + wxMemoryBufferData::DefBufSize; |
| 483 | } |
| 484 | } |
| 485 | |
| 486 | void IncRef() { m_ref += 1; } |
| 487 | void DecRef() |
| 488 | { |
| 489 | m_ref -= 1; |
| 490 | if (m_ref == 0) // are there no more references? |
| 491 | delete this; |
| 492 | } |
| 493 | |
| 494 | void *release() |
| 495 | { |
| 496 | if ( m_data == NULL__null ) |
| 497 | return NULL__null; |
| 498 | |
| 499 | wxASSERT_MSG( m_ref == 1, "can't release shared buffer" )do { if ( m_ref == 1 ) { } else if ( wxTheAssertHandler && (wxOnAssert("/usr/include/wx-3.2/wx/buffer.h", 499, __FUNCTION__ , "m_ref == 1", "can't release shared buffer"), wxTrapInAssert ) ) { wxTrapInAssert = false; asm volatile ("int $3"); } } while ( (void)0, 0 ); |
| 500 | |
| 501 | void *p = m_data; |
| 502 | m_data = NULL__null; |
| 503 | m_len = |
| 504 | m_size = 0; |
| 505 | |
| 506 | return p; |
| 507 | } |
| 508 | |
| 509 | |
| 510 | // the buffer containing the data |
| 511 | void *m_data; |
| 512 | |
| 513 | // the size of the buffer |
| 514 | size_t m_size; |
| 515 | |
| 516 | // the amount of data currently in the buffer |
| 517 | size_t m_len; |
| 518 | |
| 519 | // the reference count |
| 520 | size_t m_ref; |
| 521 | |
| 522 | wxDECLARE_NO_COPY_CLASS(wxMemoryBufferData)private: wxMemoryBufferData(const wxMemoryBufferData&) = delete ; wxMemoryBufferData& operator=(const wxMemoryBufferData& ) = delete; |
| 523 | }; |
| 524 | |
| 525 | |
| 526 | class wxMemoryBuffer |
| 527 | { |
| 528 | public: |
| 529 | // ctor and dtor |
| 530 | wxMemoryBuffer(size_t size = wxMemoryBufferData::DefBufSize) |
| 531 | { |
| 532 | m_bufdata = new wxMemoryBufferData(size); |
| 533 | m_bufdata->IncRef(); |
| 534 | } |
| 535 | |
| 536 | ~wxMemoryBuffer() { m_bufdata->DecRef(); } |
| 537 | |
| 538 | |
| 539 | // copy and assignment |
| 540 | wxMemoryBuffer(const wxMemoryBuffer& src) |
| 541 | : m_bufdata(src.m_bufdata) |
| 542 | { |
| 543 | m_bufdata->IncRef(); |
| 544 | } |
| 545 | |
| 546 | wxMemoryBuffer& operator=(const wxMemoryBuffer& src) |
| 547 | { |
| 548 | if (&src != this) |
| 549 | { |
| 550 | m_bufdata->DecRef(); |
| 551 | m_bufdata = src.m_bufdata; |
| 552 | m_bufdata->IncRef(); |
| 553 | } |
| 554 | return *this; |
| 555 | } |
| 556 | |
| 557 | |
| 558 | // Accessors |
| 559 | void *GetData() const { return m_bufdata->m_data; } |
| 560 | size_t GetBufSize() const { return m_bufdata->m_size; } |
| 561 | size_t GetDataLen() const { return m_bufdata->m_len; } |
| 562 | |
| 563 | bool IsEmpty() const { return GetDataLen() == 0; } |
| 564 | |
| 565 | void SetBufSize(size_t size) { m_bufdata->ResizeIfNeeded(size); } |
| 566 | void SetDataLen(size_t len) |
| 567 | { |
| 568 | wxASSERT(len <= m_bufdata->m_size)do { if ( len <= m_bufdata->m_size ) { } else if ( wxTheAssertHandler && (wxOnAssert("/usr/include/wx-3.2/wx/buffer.h", 568 , __FUNCTION__, "len <= m_bufdata->m_size", (const char *)__null), wxTrapInAssert) ) { wxTrapInAssert = false; asm volatile ("int $3"); } } while ( (void)0, 0 ); |
| 569 | m_bufdata->m_len = len; |
| 570 | } |
| 571 | |
| 572 | void Clear() { SetDataLen(0); } |
| 573 | |
| 574 | // Ensure the buffer is big enough and return a pointer to it |
| 575 | void *GetWriteBuf(size_t sizeNeeded) |
| 576 | { |
| 577 | m_bufdata->ResizeIfNeeded(sizeNeeded); |
| 578 | return m_bufdata->m_data; |
| 579 | } |
| 580 | |
| 581 | // Update the length after the write |
| 582 | void UngetWriteBuf(size_t sizeUsed) { SetDataLen(sizeUsed); } |
| 583 | |
| 584 | // Like the above, but appends to the buffer |
| 585 | void *GetAppendBuf(size_t sizeNeeded) |
| 586 | { |
| 587 | m_bufdata->ResizeIfNeeded(m_bufdata->m_len + sizeNeeded); |
| 588 | return (char*)m_bufdata->m_data + m_bufdata->m_len; |
| 589 | } |
| 590 | |
| 591 | // Update the length after the append |
| 592 | void UngetAppendBuf(size_t sizeUsed) |
| 593 | { |
| 594 | SetDataLen(m_bufdata->m_len + sizeUsed); |
| 595 | } |
| 596 | |
| 597 | // Other ways to append to the buffer |
| 598 | void AppendByte(char data) |
| 599 | { |
| 600 | wxCHECK_RET( m_bufdata->m_data, wxT("invalid wxMemoryBuffer") )if ( m_bufdata->m_data ) {} else { do { if ( wxTheAssertHandler && (wxOnAssert("/usr/include/wx-3.2/wx/buffer.h", 600 , __FUNCTION__, "\"m_bufdata->m_data\"", L"invalid wxMemoryBuffer" ), wxTrapInAssert) ) { wxTrapInAssert = false; asm volatile ( "int $3"); } } while ( (void)0, 0 ); return; } struct wxDummyCheckStruct600; |
| 601 | |
| 602 | m_bufdata->ResizeIfNeeded(m_bufdata->m_len + 1); |
| 603 | *(((char*)m_bufdata->m_data) + m_bufdata->m_len) = data; |
| 604 | m_bufdata->m_len += 1; |
| 605 | } |
| 606 | |
| 607 | void AppendData(const void *data, size_t len) |
| 608 | { |
| 609 | memcpy(GetAppendBuf(len), data, len); |
| 610 | UngetAppendBuf(len); |
| 611 | } |
| 612 | |
| 613 | operator const char *() const { return (const char*)GetData(); } |
| 614 | |
| 615 | // gives up ownership of data, returns the pointer; after this call, |
| 616 | // data isn't freed by the buffer and its content is resent to empty |
| 617 | void *release() |
| 618 | { |
| 619 | return m_bufdata->release(); |
| 620 | } |
| 621 | |
| 622 | private: |
| 623 | wxMemoryBufferData* m_bufdata; |
| 624 | }; |
| 625 | |
| 626 | // ---------------------------------------------------------------------------- |
| 627 | // template class for any kind of data |
| 628 | // ---------------------------------------------------------------------------- |
| 629 | |
| 630 | // TODO |
| 631 | |
| 632 | #endif // _WX_BUFFER_H |