+// ----------------------------------------------------------------------------
+// wxStreamBuffer
+// ----------------------------------------------------------------------------
+
+wxStreamBuffer::wxStreamBuffer(wxStreamBase& stream, BufMode mode)
+ : m_buffer_start(NULL), m_buffer_end(NULL), m_buffer_pos(NULL),
+ m_buffer_size(0), m_stream(&stream), m_mode(mode)
+{
+}
+
+wxStreamBuffer::~wxStreamBuffer()
+{
+ wxDELETEA(m_buffer_start);
+}
+
+bool wxStreamBuffer::WriteBack(const char *buf, size_t bufsize)
+{
+ char *ptrback;
+
+ ptrback = AllocSpaceWBack(bufsize);
+ if (!ptrback)
+ return FALSE;
+
+ memcpy(ptrback, buf, bufsize);
+ return TRUE;
+}
+
+bool wxStreamBuffer::WriteBack(char c)
+{
+ char *ptrback;
+
+ ptrback = AllocSpaceWBack(1);
+ if (!ptrback)
+ return FALSE;
+
+ *ptrback = c;
+ return TRUE;
+}
+
+void wxStreamBuffer::SetBufferIO(char *buffer_start, char *buffer_end)
+{
+ m_buffer_start = buffer_start;
+ m_buffer_end = buffer_end;
+
+ m_buffer_size = m_buffer_end-m_buffer_start;
+ ResetBuffer();
+}
+
+void wxStreamBuffer::SetBufferIO(size_t bufsize)
+{
+ char *b_start;
+
+ wxDELETE(m_buffer_start);
+
+ if (!bufsize) {
+ m_buffer_start = NULL;
+ m_buffer_end = NULL;
+ m_buffer_pos = NULL;
+ m_buffer_size = 0;
+ return;
+ }
+
+ b_start = new char[bufsize];
+
+ SetBufferIO(b_start, b_start + bufsize);
+}
+
+void wxStreamBuffer::ResetBuffer()
+{
+ if (m_mode == read)
+ m_buffer_pos = m_buffer_end;
+ else
+ m_buffer_pos = m_buffer_start;
+}
+
+char *wxStreamBuffer::AllocSpaceWBack(size_t needed_size)
+{
+ char *temp_b;
+
+ m_wbacksize += needed_size;
+
+ if (!m_wback)
+ temp_b = (char *)malloc(m_wbacksize);
+ else
+ temp_b = (char *)realloc(m_wback, m_wbacksize);
+
+ if (!temp_b)
+ return NULL;
+ return (char *)((size_t)m_wback+(m_wbacksize-needed_size));
+}
+
+size_t wxStreamBuffer::GetWBack(char *buf, size_t bsize)
+{
+ size_t s_toget = m_wbacksize-m_wbackcur;
+
+ if (bsize < s_toget)
+ s_toget = bsize;
+
+ memcpy(buf, (m_wback+m_wbackcur), s_toget);
+
+ m_wbackcur += s_toget;
+ if (m_wbackcur == m_wbacksize) {
+ free(m_wback);
+ m_wback = (char *)NULL;
+ m_wbacksize = 0;
+ m_wbackcur = 0;
+ }
+
+ return s_toget;
+}
+
+bool wxStreamBuffer::FillBuffer()
+{
+ size_t count;
+
+ count = m_stream->OnSysRead(m_buffer_start, m_buffer_size);
+ m_buffer_end = m_buffer_start+count;
+ m_buffer_pos = m_buffer_start;
+
+ if (count == 0)
+ return FALSE;
+ return TRUE;
+}
+
+bool wxStreamBuffer::FlushBuffer()
+{
+ size_t count, current;
+
+ if (m_buffer_pos == m_buffer_start)
+ return FALSE;
+
+ current = m_buffer_pos-m_buffer_start;
+ count = m_stream->OnSysWrite(m_buffer_start, current);
+ if (count != current)
+ return FALSE;
+ m_buffer_pos = m_buffer_start;
+
+ return TRUE;
+}
+
+void wxStreamBuffer::GetFromBuffer(void *buffer, size_t size)
+{
+ size_t s_toget = m_buffer_end-m_buffer_pos;
+
+ if (size < s_toget)
+ s_toget = size;
+
+ memcpy(buffer, m_buffer_pos, s_toget);
+ m_buffer_pos += s_toget;
+}
+
+void wxStreamBuffer::PutToBuffer(const void *buffer, size_t size)
+{
+ size_t s_toput = m_buffer_end-m_buffer_pos;
+
+ if (s_toput < size && !m_fixed) {
+ m_buffer_start = (char *)realloc(m_buffer_start, m_buffer_size+size);
+ // I round a bit
+ m_buffer_end = m_buffer_start+m_buffer_size;
+ s_toput = size;
+ }
+ if (s_toput > size)
+ s_toput = size;
+ memcpy(m_buffer_pos, buffer, s_toput);
+ m_buffer_pos += s_toput;
+}
+
+void wxStreamBuffer::Read(void *buffer, size_t size)
+{
+ wxASSERT(m_stream != NULL);
+
+ // ------------------
+ // Buffering disabled
+ // ------------------
+
+ m_stream->m_lastcount = GetWBack((char *)buffer, size);
+ size -= m_stream->m_lastcount;
+ if (size == 0)
+ return;
+
+ buffer = (void *)((char *)buffer+m_stream->m_lastcount);
+
+ if (!m_buffer_size) {
+ m_stream->m_lastcount += m_stream->OnSysRead(buffer, size);
+ return;
+ }
+
+ // -----------------
+ // Buffering enabled
+ // -----------------
+ size_t buf_left, orig_size = size;
+
+ while (size > 0) {
+ buf_left = GetDataLeft();
+
+ // First case: the requested buffer is larger than the stream buffer,
+ // we split
+ if (size > buf_left) {
+ GetFromBuffer(buffer, buf_left);
+ size -= buf_left;
+ buffer = (char *)buffer + buf_left; // ANSI C++ violation.
+
+ if (!FillBuffer()) {
+ m_stream->m_lastcount = orig_size-size;
+ return;
+ }
+ } else {
+
+ // Second case: we just copy from the stream buffer.
+ GetFromBuffer(buffer, size);
+ break;
+ }
+ }
+ m_stream->m_lastcount += orig_size;
+}
+
+void wxStreamBuffer::Write(const void *buffer, size_t size)
+{
+ wxASSERT(m_stream != NULL);
+
+ // ------------------
+ // Buffering disabled
+ // ------------------
+
+ if (!m_buffer_size) {
+ m_stream->m_lastcount = m_stream->OnSysWrite(buffer, size);
+ return;
+ }
+
+ // ------------------
+ // Buffering enabled
+ // ------------------
+
+ size_t buf_left, orig_size = size;
+
+ while (size > 0) {
+ buf_left = m_buffer_end - m_buffer_pos;
+
+ // First case: the buffer to write is larger than the stream buffer,
+ // we split it
+ if (size > buf_left) {
+ PutToBuffer(buffer, buf_left);
+ size -= buf_left;
+ buffer = (char *)buffer + buf_left; // ANSI C++ violation.
+
+ if (!FlushBuffer()) {
+ m_stream->m_lastcount = orig_size-size;
+ return;
+ }
+ m_buffer_pos = m_buffer_start;
+
+ } else {
+
+ // Second case: just copy it in the stream buffer.
+ PutToBuffer(buffer, size);
+ break;
+ }
+ }
+ m_stream->m_lastcount = orig_size;
+}
+
+off_t wxStreamBuffer::Seek(off_t pos, wxSeekMode mode)
+{
+ off_t ret_off, diff, last_access;
+
+ last_access = GetLastAccess();
+
+ switch (mode) {
+ case wxFromStart: {
+ // We'll try to compute an internal position later ...
+ ret_off = m_stream->OnSysSeek(pos, wxFromStart);
+ ResetBuffer();
+ return ret_off;
+ }
+ case wxFromCurrent: {
+ diff = pos + GetIntPosition();
+
+ if ( (diff > last_access) || (diff < 0) ) {
+ ret_off = m_stream->OnSysSeek(pos, wxFromCurrent);
+ ResetBuffer();
+ return ret_off;
+ } else {
+ SetIntPosition(diff);
+ return pos;
+ }
+ }
+ case wxFromEnd:
+ // Hard to compute: always seek to the requested position.
+ ret_off = m_stream->OnSysSeek(pos, wxFromEnd);
+ ResetBuffer();
+ return ret_off;
+ }
+ return wxInvalidOffset;
+}
+
+off_t wxStreamBuffer::Tell() const
+{
+ off_t pos;
+
+ pos = m_stream->OnSysTell();
+ if (pos == wxInvalidOffset)
+ return wxInvalidOffset;
+
+ return pos - GetLastAccess() + GetIntPosition();
+}
+
+size_t wxStreamBuffer::GetDataLeft() const
+{
+ return m_buffer_end-m_buffer_pos;
+}
+
+// ----------------------------------------------------------------------------
+// wxStreamBase
+// ----------------------------------------------------------------------------
+
+wxStreamBase::wxStreamBase()
+{
+ m_lasterror = wxStream_NOERROR;
+ m_lastcount = 0;
+}
+
+wxStreamBase::~wxStreamBase()
+{
+}
+
+size_t wxStreamBase::OnSysRead(void *buffer, size_t size)
+{
+ return 0;
+}
+
+size_t wxStreamBase::OnSysWrite(const void *buffer, size_t bufsize)
+{
+ return 0;
+}
+
+off_t wxStreamBase::OnSysSeek(off_t seek, wxSeekMode mode)
+{
+ return wxInvalidOffset;
+}
+
+off_t wxStreamBase::OnSysTell()
+{
+ return wxInvalidOffset;
+}
+
+// ----------------------------------------------------------------------------
+// wxInputStream
+// ----------------------------------------------------------------------------
projects / wxWidgets.git / blobdiff