X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/68f146206ff65cfafdf88c154aece854a0ba4864..12b5f4b4d2d8a07962da7ba3b78c8c1ec2634a67:/src/common/stream.cpp diff --git a/src/common/stream.cpp b/src/common/stream.cpp index 4765ea03f6..657e6675d4 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; @@ -693,6 +714,8 @@ wxFileOffset wxStreamBase::OnSysTell() const // wxInputStream // ---------------------------------------------------------------------------- +IMPLEMENT_ABSTRACT_CLASS(wxInputStream, wxStreamBase) + wxInputStream::wxInputStream() { m_wback = NULL; @@ -938,6 +961,8 @@ wxFileOffset wxInputStream::TellI() const // wxOutputStream // ---------------------------------------------------------------------------- +IMPLEMENT_ABSTRACT_CLASS(wxOutputStream, wxStreamBase) + wxOutputStream::wxOutputStream() { } @@ -988,6 +1013,8 @@ void wxOutputStream::Sync() // wxCountingOutputStream // ---------------------------------------------------------------------------- +IMPLEMENT_DYNAMIC_CLASS(wxCountingOutputStream, wxOutputStream) + wxCountingOutputStream::wxCountingOutputStream () { m_currentPos = 0; @@ -1050,6 +1077,8 @@ wxFileOffset wxCountingOutputStream::OnSysTell() const // wxFilterInputStream // ---------------------------------------------------------------------------- +IMPLEMENT_ABSTRACT_CLASS(wxFilterInputStream, wxInputStream) + wxFilterInputStream::wxFilterInputStream() : m_parent_i_stream(NULL), m_owns(false) @@ -1078,6 +1107,8 @@ wxFilterInputStream::~wxFilterInputStream() // wxFilterOutputStream // ---------------------------------------------------------------------------- +IMPLEMENT_ABSTRACT_CLASS(wxFilterOutputStream, wxOutputStream) + wxFilterOutputStream::wxFilterOutputStream() : m_parent_o_stream(NULL), m_owns(false) @@ -1122,29 +1153,25 @@ wxString wxFilterClassFactoryBase::PopExtension(const wxString& location) const } wxString::size_type wxFilterClassFactoryBase::FindExtension( - const wxChar *location) const + const wxString& location) const { - size_t len = wxStrlen(location); - for (const wxChar *const *p = GetProtocols(wxSTREAM_FILEEXT); *p; p++) { - size_t l = wxStrlen(*p); - - if (l <= len && wxStrcmp(*p, location + len - l) == 0) - return len - l; + if ( location.EndsWith(*p) ) + return location.length() - wxStrlen(*p); } return wxString::npos; } -bool wxFilterClassFactoryBase::CanHandle(const wxChar *protocol, +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 (wxStrcmp(*p, protocol) == 0) + if (protocol == *p) return true; return false; @@ -1177,21 +1204,33 @@ 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(stream, bufsize); +} + +} // 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() @@ -1221,12 +1260,15 @@ 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; } @@ -1290,20 +1332,18 @@ 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()