X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/8913c40c32bf45df97280c5b1e5a542bfc764ca8..a43a9e5521440dbb28037646ed4a07125c8823a9:/src/common/stream.cpp diff --git a/src/common/stream.cpp b/src/common/stream.cpp index a0ce91c79d..357499b047 100644 --- a/src/common/stream.cpp +++ b/src/common/stream.cpp @@ -63,7 +63,6 @@ void wxStreamBuffer::InitBuffer() m_buffer_start = m_buffer_end = m_buffer_pos = NULL; - m_buffer_size = 0; // if we are going to allocate the buffer, we should free it later as well m_destroybuf = true; @@ -76,24 +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) @@ -106,7 +105,6 @@ wxStreamBuffer::wxStreamBuffer(const wxStreamBuffer& buffer) m_buffer_start = buffer.m_buffer_start; m_buffer_end = buffer.m_buffer_end; m_buffer_pos = buffer.m_buffer_pos; - m_buffer_size = buffer.m_buffer_size; m_fixed = buffer.m_fixed; m_flushable = buffer.m_flushable; m_stream = buffer.m_stream; @@ -156,8 +154,6 @@ void wxStreamBuffer::SetBufferIO(void *start, m_buffer_start = (char *)start; m_buffer_end = m_buffer_start + len; - m_buffer_size = len; - // if we own it, we free it m_destroybuf = takeOwnership; @@ -192,6 +188,27 @@ void wxStreamBuffer::ResetBuffer() : m_buffer_start; } +void wxStreamBuffer::Truncate() +{ + size_t new_size = m_buffer_pos - m_buffer_start; + if ( m_buffer_pos == m_buffer_end ) + return; + + if ( !new_size ) + { + FreeBuffer(); + InitBuffer(); + return; + } + + char *new_start = (char *)realloc(m_buffer_start, new_size); + wxCHECK_RET( new_size, _T("shrinking buffer shouldn't fail") ); + + m_buffer_start = new_start; + m_buffer_end = m_buffer_start + new_size; + m_buffer_pos = m_buffer_end; +} + // fill the buffer with as much data as possible (only for read buffers) bool wxStreamBuffer::FillBuffer() { @@ -201,7 +218,7 @@ bool wxStreamBuffer::FillBuffer() if ( !inStream ) return false; - size_t count = inStream->OnSysRead(m_buffer_start, m_buffer_size); + size_t count = inStream->OnSysRead(GetBufferStart(), GetBufferSize()); if ( !count ) return false; @@ -271,24 +288,26 @@ void wxStreamBuffer::PutToBuffer(const void *buffer, size_t size) else // !m_fixed { // realloc the buffer to have enough space for the data - size_t delta = m_buffer_pos - m_buffer_start; - - char *startOld = m_buffer_start; - m_buffer_size += size; - m_buffer_start = (char *)realloc(m_buffer_start, m_buffer_size); - if ( !m_buffer_start ) + if ( m_buffer_pos + size > m_buffer_end ) { - // don't leak memory if realloc() failed - m_buffer_start = startOld; - m_buffer_size -= size; + size_t delta = m_buffer_pos - m_buffer_start; + size_t new_size = delta + size; - // what else can we do? - return; - } + char *startOld = m_buffer_start; + m_buffer_start = (char *)realloc(m_buffer_start, new_size); + if ( !m_buffer_start ) + { + // don't leak memory if realloc() failed + m_buffer_start = startOld; + + // what else can we do? + return; + } - // adjust the pointers invalidated by realloc() - m_buffer_pos = m_buffer_start + delta; - m_buffer_end = m_buffer_start + m_buffer_size; + // adjust the pointers invalidated by realloc() + m_buffer_pos = m_buffer_start + delta; + m_buffer_end = m_buffer_start + new_size; + } // else: the buffer is big enough } } @@ -657,6 +676,8 @@ wxFileOffset wxStreamBuffer::Tell() const // wxStreamBase // ---------------------------------------------------------------------------- +IMPLEMENT_ABSTRACT_CLASS(wxStreamBase, wxObject) + wxStreamBase::wxStreamBase() { m_lasterror = wxSTREAM_NO_ERROR; @@ -670,7 +691,7 @@ wxStreamBase::~wxStreamBase() size_t wxStreamBase::GetSize() const { wxFileOffset length = GetLength(); - if ( length == wxInvalidOffset ) + if ( length == (wxFileOffset)wxInvalidOffset ) return 0; const size_t len = wx_truncate_cast(size_t, length); @@ -693,6 +714,8 @@ wxFileOffset wxStreamBase::OnSysTell() const // wxInputStream // ---------------------------------------------------------------------------- +IMPLEMENT_ABSTRACT_CLASS(wxInputStream, wxStreamBase) + wxInputStream::wxInputStream() { m_wback = NULL; @@ -809,11 +832,11 @@ bool wxInputStream::Ungetch(char c) return Ungetch(&c, sizeof(c)) != 0; } -char wxInputStream::GetC() +int wxInputStream::GetC() { - char c; + unsigned char c; Read(&c, sizeof(c)); - return c; + return LastRead() ? c : wxEOF; } wxInputStream& wxInputStream::Read(void *buf, size_t size) @@ -869,6 +892,7 @@ char wxInputStream::Peek() wxInputStream& wxInputStream::Read(wxOutputStream& stream_out) { + size_t lastcount = 0; char buf[BUF_TEMP_SIZE]; for ( ;; ) @@ -879,8 +903,12 @@ wxInputStream& wxInputStream::Read(wxOutputStream& stream_out) if ( stream_out.Write(buf, bytes_read).LastWrite() != bytes_read ) break; + + lastcount += bytes_read; } + m_lastcount = lastcount; + return *this; } @@ -888,13 +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 @@ -933,6 +996,8 @@ wxFileOffset wxInputStream::TellI() const // wxOutputStream // ---------------------------------------------------------------------------- +IMPLEMENT_ABSTRACT_CLASS(wxOutputStream, wxStreamBase) + wxOutputStream::wxOutputStream() { } @@ -983,6 +1048,8 @@ void wxOutputStream::Sync() // wxCountingOutputStream // ---------------------------------------------------------------------------- +IMPLEMENT_DYNAMIC_CLASS(wxCountingOutputStream, wxOutputStream) + wxCountingOutputStream::wxCountingOutputStream () { m_currentPos = 0; @@ -1045,59 +1112,162 @@ wxFileOffset wxCountingOutputStream::OnSysTell() const // wxFilterInputStream // ---------------------------------------------------------------------------- +IMPLEMENT_ABSTRACT_CLASS(wxFilterInputStream, wxInputStream) + wxFilterInputStream::wxFilterInputStream() + : m_parent_i_stream(NULL), + m_owns(false) { - m_parent_i_stream = NULL; } wxFilterInputStream::wxFilterInputStream(wxInputStream& stream) + : m_parent_i_stream(&stream), + m_owns(false) +{ +} + +wxFilterInputStream::wxFilterInputStream(wxInputStream *stream) + : m_parent_i_stream(stream), + m_owns(true) { - m_parent_i_stream = &stream; } wxFilterInputStream::~wxFilterInputStream() { + if (m_owns) + delete m_parent_i_stream; } // ---------------------------------------------------------------------------- // wxFilterOutputStream // ---------------------------------------------------------------------------- +IMPLEMENT_ABSTRACT_CLASS(wxFilterOutputStream, wxOutputStream) + wxFilterOutputStream::wxFilterOutputStream() + : m_parent_o_stream(NULL), + m_owns(false) { - m_parent_o_stream = NULL; } wxFilterOutputStream::wxFilterOutputStream(wxOutputStream& stream) + : m_parent_o_stream(&stream), + m_owns(false) +{ +} + +wxFilterOutputStream::wxFilterOutputStream(wxOutputStream *stream) + : m_parent_o_stream(stream), + m_owns(true) { - m_parent_o_stream = &stream; +} + +bool wxFilterOutputStream::Close() +{ + if (m_parent_o_stream && m_owns) + return m_parent_o_stream->Close(); + else + return true; } wxFilterOutputStream::~wxFilterOutputStream() { + if (m_owns) + delete m_parent_o_stream; } // ---------------------------------------------------------------------------- -// wxBufferedInputStream +// wxFilterClassFactoryBase // ---------------------------------------------------------------------------- -wxBufferedInputStream::wxBufferedInputStream(wxInputStream& s, - wxStreamBuffer *buffer) - : wxFilterInputStream(s) +IMPLEMENT_ABSTRACT_CLASS(wxFilterClassFactoryBase, wxObject) + +wxString wxFilterClassFactoryBase::PopExtension(const wxString& location) const +{ + return location.substr(0, FindExtension(location)); +} + +wxString::size_type wxFilterClassFactoryBase::FindExtension( + const wxString& location) const { - if ( buffer ) + for (const wxChar *const *p = GetProtocols(wxSTREAM_FILEEXT); *p; p++) { - // use the buffer provided by the user - m_i_streambuf = buffer; + if ( location.EndsWith(*p) ) + return location.length() - wxStrlen(*p); } - else // create a default buffer + + return wxString::npos; +} + +bool wxFilterClassFactoryBase::CanHandle(const wxString& protocol, + wxStreamProtocolType type) const +{ + if (type == wxSTREAM_FILEEXT) + return FindExtension(protocol) != wxString::npos; + else + for (const wxChar *const *p = GetProtocols(type); *p; p++) + if (protocol == *p) + return true; + + return false; +} + +// ---------------------------------------------------------------------------- +// wxFilterClassFactory +// ---------------------------------------------------------------------------- + +IMPLEMENT_ABSTRACT_CLASS(wxFilterClassFactory, wxFilterClassFactoryBase) + +wxFilterClassFactory *wxFilterClassFactory::sm_first = NULL; + +void wxFilterClassFactory::Remove() +{ + if (m_next != this) { - m_i_streambuf = new wxStreamBuffer(*this, wxStreamBuffer::read); + wxFilterClassFactory **pp = &sm_first; - m_i_streambuf->SetBufferIO(1024); + while (*pp != this) + pp = &(*pp)->m_next; + + *pp = m_next; + + m_next = this; } } +// ---------------------------------------------------------------------------- +// wxBufferedInputStream +// ---------------------------------------------------------------------------- + +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(stream) +{ + m_i_streambuf = CreateBufferIfNeeded(*this, buffer); +} + +wxBufferedInputStream::wxBufferedInputStream(wxInputStream& stream, + size_t bufsize) + : wxFilterInputStream(stream) +{ + m_i_streambuf = CreateBufferIfNeeded(*this, NULL, bufsize); +} + wxBufferedInputStream::~wxBufferedInputStream() { m_parent_i_stream->SeekI(-(wxFileOffset)m_i_streambuf->GetBytesLeft(), @@ -1125,12 +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; } @@ -1194,20 +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()