X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/b23bc769d3d1943ca2b02ca90701d86b00880af9..db06cdc08cee40c72854d6a883cf017c2bcc670e:/src/common/stream.cpp diff --git a/src/common/stream.cpp b/src/common/stream.cpp index c612f4835b..1a03caa346 100644 --- a/src/common/stream.cpp +++ b/src/common/stream.cpp @@ -75,24 +75,24 @@ void wxStreamBuffer::Init() m_fixed = true; } -wxStreamBuffer::wxStreamBuffer(BufMode mode) +void wxStreamBuffer::InitWithStream(wxStreamBase& stream, BufMode mode) { Init(); - m_stream = NULL; + m_stream = &stream; m_mode = mode; - m_flushable = false; + m_flushable = true; } -wxStreamBuffer::wxStreamBuffer(wxStreamBase& stream, BufMode mode) +wxStreamBuffer::wxStreamBuffer(BufMode mode) { Init(); - m_stream = &stream; + m_stream = NULL; m_mode = mode; - m_flushable = true; + m_flushable = false; } wxStreamBuffer::wxStreamBuffer(const wxStreamBuffer& buffer) @@ -100,7 +100,7 @@ wxStreamBuffer::wxStreamBuffer(const wxStreamBuffer& buffer) // doing this has big chances to lead to a crash when the source buffer is // destroyed (otherwise assume the caller knows what he does) wxASSERT_MSG( !buffer.m_destroybuf, - _T("it's a bad idea to copy this buffer") ); + wxT("it's a bad idea to copy this buffer") ); m_buffer_start = buffer.m_buffer_start; m_buffer_end = buffer.m_buffer_end; @@ -202,7 +202,7 @@ void wxStreamBuffer::Truncate() } char *new_start = (char *)realloc(m_buffer_start, new_size); - wxCHECK_RET( new_size, _T("shrinking buffer shouldn't fail") ); + wxCHECK_RET( new_size, wxT("shrinking buffer shouldn't fail") ); m_buffer_start = new_start; m_buffer_end = m_buffer_start + new_size; @@ -231,7 +231,7 @@ bool wxStreamBuffer::FillBuffer() // write the buffer contents to the stream (only for write buffers) bool wxStreamBuffer::FlushBuffer() { - wxCHECK_MSG( m_flushable, false, _T("can't flush this buffer") ); + wxCHECK_MSG( m_flushable, false, wxT("can't flush this buffer") ); // FIXME: what is this check for? (VZ) if ( m_buffer_pos == m_buffer_start ) @@ -239,7 +239,7 @@ bool wxStreamBuffer::FlushBuffer() wxOutputStream *outStream = GetOutputStream(); - wxCHECK_MSG( outStream, false, _T("should have a stream in wxStreamBuffer") ); + wxCHECK_MSG( outStream, false, wxT("should have a stream in wxStreamBuffer") ); size_t current = m_buffer_pos - m_buffer_start; size_t count = outStream->OnSysWrite(m_buffer_start, current); @@ -319,7 +319,7 @@ void wxStreamBuffer::PutChar(char c) { wxOutputStream *outStream = GetOutputStream(); - wxCHECK_RET( outStream, _T("should have a stream in wxStreamBuffer") ); + wxCHECK_RET( outStream, wxT("should have a stream in wxStreamBuffer") ); // if we don't have buffer at all, just forward this call to the stream, if ( !HasBuffer() ) @@ -345,7 +345,7 @@ void wxStreamBuffer::PutChar(char c) char wxStreamBuffer::Peek() { wxCHECK_MSG( m_stream && HasBuffer(), 0, - _T("should have the stream and the buffer in wxStreamBuffer") ); + wxT("should have the stream and the buffer in wxStreamBuffer") ); if ( !GetDataLeft() ) { @@ -364,7 +364,7 @@ char wxStreamBuffer::GetChar() { wxInputStream *inStream = GetInputStream(); - wxCHECK_MSG( inStream, 0, _T("should have a stream in wxStreamBuffer") ); + wxCHECK_MSG( inStream, 0, wxT("should have a stream in wxStreamBuffer") ); char c; if ( !HasBuffer() ) @@ -390,7 +390,7 @@ char wxStreamBuffer::GetChar() size_t wxStreamBuffer::Read(void *buffer, size_t size) { - wxASSERT_MSG( buffer, _T("Warning: Null pointer is about to be used") ); + wxASSERT_MSG( buffer, wxT("Warning: Null pointer is about to be used") ); /* Clear buffer first */ memset(buffer, 0x00, size); @@ -404,7 +404,7 @@ size_t wxStreamBuffer::Read(void *buffer, size_t size) { wxInputStream *inStream = GetInputStream(); - wxCHECK_MSG( inStream, 0, _T("should have a stream in wxStreamBuffer") ); + wxCHECK_MSG( inStream, 0, wxT("should have a stream in wxStreamBuffer") ); readBytes = inStream->OnSysRead(buffer, size); } @@ -449,7 +449,7 @@ size_t wxStreamBuffer::Read(void *buffer, size_t size) // this should really be called "Copy()" size_t wxStreamBuffer::Read(wxStreamBuffer *dbuf) { - wxCHECK_MSG( m_mode != write, 0, _T("can't read from this buffer") ); + wxCHECK_MSG( m_mode != write, 0, wxT("can't read from this buffer") ); char buf[BUF_TEMP_SIZE]; size_t nRead, @@ -471,7 +471,7 @@ size_t wxStreamBuffer::Read(wxStreamBuffer *dbuf) size_t wxStreamBuffer::Write(const void *buffer, size_t size) { - wxASSERT_MSG( buffer, _T("Warning: Null pointer is about to be send") ); + wxASSERT_MSG( buffer, wxT("Warning: Null pointer is about to be send") ); if (m_stream) { @@ -485,7 +485,7 @@ size_t wxStreamBuffer::Write(const void *buffer, size_t size) { wxOutputStream *outStream = GetOutputStream(); - wxCHECK_MSG( outStream, 0, _T("should have a stream in wxStreamBuffer") ); + wxCHECK_MSG( outStream, 0, wxT("should have a stream in wxStreamBuffer") ); // no buffer, just forward the call to the stream ret = outStream->OnSysWrite(buffer, size); @@ -543,8 +543,8 @@ size_t wxStreamBuffer::Write(const void *buffer, size_t size) size_t wxStreamBuffer::Write(wxStreamBuffer *sbuf) { - wxCHECK_MSG( m_mode != read, 0, _T("can't write to this buffer") ); - wxCHECK_MSG( sbuf->m_mode != write, 0, _T("can't read from that buffer") ); + wxCHECK_MSG( m_mode != read, 0, wxT("can't write to this buffer") ); + wxCHECK_MSG( sbuf->m_mode != write, 0, wxT("can't read from that buffer") ); char buf[BUF_TEMP_SIZE]; size_t nWrite, @@ -599,7 +599,7 @@ wxFileOffset wxStreamBuffer::Seek(wxFileOffset pos, wxSeekMode mode) break; default: - wxFAIL_MSG( _T("invalid seek mode") ); + wxFAIL_MSG( wxT("invalid seek mode") ); return wxInvalidOffset; } @@ -635,7 +635,7 @@ wxFileOffset wxStreamBuffer::Seek(wxFileOffset pos, wxSeekMode mode) size_t int_diff = wx_truncate_cast(size_t, diff); wxCHECK_MSG( (wxFileOffset)int_diff == diff, wxInvalidOffset, wxT("huge file not supported") ); SetIntPosition(int_diff); - return pos; + return diff; } case wxFromEnd: @@ -695,7 +695,7 @@ size_t wxStreamBase::GetSize() const return 0; const size_t len = wx_truncate_cast(size_t, length); - wxASSERT_MSG( len == length + size_t(0), _T("large files not supported") ); + wxASSERT_MSG( len == length + size_t(0), wxT("large files not supported") ); return len; } @@ -771,7 +771,7 @@ char *wxInputStream::AllocSpaceWBack(size_t needed_size) size_t wxInputStream::GetWBack(void *buf, size_t size) { - wxASSERT_MSG( buf, _T("Warning: Null pointer is about to be used") ); + wxASSERT_MSG( buf, wxT("Warning: Null pointer is about to be used") ); /* Clear buffer first */ memset(buf, 0x00, size); @@ -807,7 +807,7 @@ size_t wxInputStream::GetWBack(void *buf, size_t size) size_t wxInputStream::Ungetch(const void *buf, size_t bufsize) { - wxASSERT_MSG( buf, _T("Warning: Null pointer is about to be used in Ungetch()") ); + wxASSERT_MSG( buf, wxT("Warning: Null pointer is about to be used in Ungetch()") ); if ( m_lasterror != wxSTREAM_NO_ERROR && m_lasterror != wxSTREAM_EOF ) { @@ -841,7 +841,7 @@ int wxInputStream::GetC() wxInputStream& wxInputStream::Read(void *buf, size_t size) { - wxASSERT_MSG( buf, _T("Warning: Null pointer is about to be read") ); + wxASSERT_MSG( buf, wxT("Warning: Null pointer is about to be read") ); char *p = (char *)buf; m_lastcount = 0; @@ -916,13 +916,48 @@ wxFileOffset wxInputStream::SeekI(wxFileOffset pos, wxSeekMode mode) { // RR: This code is duplicated in wxBufferedInputStream. This is // not really a good design, but buffered stream are different - // from all other in that they handle two stream-related objects, + // from all others in that they handle two stream-related objects: // the stream buffer and parent stream. // I don't know whether it should be put as well in wxFileInputStream::OnSysSeek if (m_lasterror==wxSTREAM_EOF) m_lasterror=wxSTREAM_NO_ERROR; + // avoid unnecessary seek operations (optimization) + wxFileOffset currentPos = TellI(), size = GetLength(); + if ((mode == wxFromStart && currentPos == pos) || + (mode == wxFromCurrent && pos == 0) || + (mode == wxFromEnd && size != wxInvalidOffset && currentPos == size-pos)) + return currentPos; + + if (!IsSeekable() && mode == wxFromCurrent && pos > 0) + { + // rather than seeking, we can just read data and discard it; + // this allows to forward-seek also non-seekable streams! + char buf[BUF_TEMP_SIZE]; + size_t bytes_read; + + // read chunks of BUF_TEMP_SIZE bytes until we reach the new position + for ( ; pos >= BUF_TEMP_SIZE; pos -= bytes_read) + { + bytes_read = Read(buf, WXSIZEOF(buf)).LastRead(); + if ( m_lasterror != wxSTREAM_NO_ERROR ) + return wxInvalidOffset; + + wxASSERT(bytes_read == WXSIZEOF(buf)); + } + + // read the last 'pos' bytes + bytes_read = Read(buf, (size_t)pos).LastRead(); + if ( m_lasterror != wxSTREAM_NO_ERROR ) + return wxInvalidOffset; + + wxASSERT(bytes_read == (size_t)pos); + + // we should now have seeked to the right position... + return TellI(); + } + /* RR: A call to SeekI() will automatically invalidate any previous call to Ungetch(), otherwise it would be possible to SeekI() to one position, unread some bytes there, SeekI() to another position @@ -1056,7 +1091,7 @@ wxFileOffset wxCountingOutputStream::OnSysSeek(wxFileOffset pos, wxSeekMode mode break; default: - wxFAIL_MSG( _T("invalid seek mode") ); + wxFAIL_MSG( wxT("invalid seek mode") ); return wxInvalidOffset; } @@ -1204,21 +1239,33 @@ void wxFilterClassFactory::Remove() // wxBufferedInputStream // ---------------------------------------------------------------------------- -wxBufferedInputStream::wxBufferedInputStream(wxInputStream& s, +namespace +{ + +// helper function used for initializing the buffer used by +// wxBufferedInput/OutputStream: it simply returns the provided buffer if it's +// not NULL or creates a buffer of the given size otherwise +template +wxStreamBuffer * +CreateBufferIfNeeded(T& stream, wxStreamBuffer *buffer, size_t bufsize = 1024) +{ + return buffer ? buffer : new wxStreamBuffer(bufsize, stream); +} + +} // anonymous namespace + +wxBufferedInputStream::wxBufferedInputStream(wxInputStream& stream, wxStreamBuffer *buffer) - : wxFilterInputStream(s) + : wxFilterInputStream(stream) { - if ( buffer ) - { - // use the buffer provided by the user - m_i_streambuf = buffer; - } - else // create a default buffer - { - m_i_streambuf = new wxStreamBuffer(*this, wxStreamBuffer::read); + m_i_streambuf = CreateBufferIfNeeded(*this, buffer); +} - m_i_streambuf->SetBufferIO(1024); - } +wxBufferedInputStream::wxBufferedInputStream(wxInputStream& stream, + size_t bufsize) + : wxFilterInputStream(stream) +{ + m_i_streambuf = CreateBufferIfNeeded(*this, NULL, bufsize); } wxBufferedInputStream::~wxBufferedInputStream() @@ -1248,12 +1295,15 @@ wxInputStream& wxBufferedInputStream::Read(void *buf, size_t size) size -= m_lastcount; buf = (char *)buf + m_lastcount; - // the call to wxStreamBuffer::Read() below will reset our m_lastcount, - // so save it + // the call to wxStreamBuffer::Read() below may reset our m_lastcount + // (but it also may not do it if the buffer is associated to another + // existing stream and wasn't created by us), so save it size_t countOld = m_lastcount; - m_i_streambuf->Read(buf, size); + // the new count of the bytes read is the count of bytes read this time + m_lastcount = m_i_streambuf->Read(buf, size); + // plus those we had read before m_lastcount += countOld; } @@ -1307,7 +1357,7 @@ wxFileOffset wxBufferedInputStream::OnSysTell() const void wxBufferedInputStream::SetInputStreamBuffer(wxStreamBuffer *buffer) { - wxCHECK_RET( buffer, _T("wxBufferedInputStream needs buffer") ); + wxCHECK_RET( buffer, wxT("wxBufferedInputStream needs buffer") ); delete m_i_streambuf; m_i_streambuf = buffer; @@ -1317,20 +1367,18 @@ void wxBufferedInputStream::SetInputStreamBuffer(wxStreamBuffer *buffer) // wxBufferedOutputStream // ---------------------------------------------------------------------------- -wxBufferedOutputStream::wxBufferedOutputStream(wxOutputStream& s, +wxBufferedOutputStream::wxBufferedOutputStream(wxOutputStream& stream, wxStreamBuffer *buffer) - : wxFilterOutputStream(s) + : wxFilterOutputStream(stream) { - if ( buffer ) - { - m_o_streambuf = buffer; - } - else // create a default one - { - m_o_streambuf = new wxStreamBuffer(*this, wxStreamBuffer::write); + m_o_streambuf = CreateBufferIfNeeded(*this, buffer); +} - m_o_streambuf->SetBufferIO(1024); - } +wxBufferedOutputStream::wxBufferedOutputStream(wxOutputStream& stream, + size_t bufsize) + : wxFilterOutputStream(stream) +{ + m_o_streambuf = CreateBufferIfNeeded(*this, NULL, bufsize); } wxBufferedOutputStream::~wxBufferedOutputStream() @@ -1392,7 +1440,7 @@ wxFileOffset wxBufferedOutputStream::GetLength() const void wxBufferedOutputStream::SetOutputStreamBuffer(wxStreamBuffer *buffer) { - wxCHECK_RET( buffer, _T("wxBufferedOutputStream needs buffer") ); + wxCHECK_RET( buffer, wxT("wxBufferedOutputStream needs buffer") ); delete m_o_streambuf; m_o_streambuf = buffer;