/////////////////////////////////////////////////////////////////////////////
-// Name: stream.cpp
+// Name: src/common/stream.cpp
// Purpose: wxStream base classes
// Author: Guilhem Lavaux
-// Modified by:
+// Modified by: VZ (23.11.00) to fix realloc()ing new[]ed memory,
+// general code review
// Created: 11/07/98
// RCS-ID: $Id$
// Copyright: (c) Guilhem Lavaux
-// Licence: wxWindows license
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
-#ifdef __GNUG__
-#pragma implementation "stream.h"
-#endif
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
-#pragma hdrstop
+ #pragma hdrstop
#endif
-#ifndef WX_PRECOMP
-#include "wx/setup.h"
-#endif
+#if wxUSE_STREAMS
-#include "wx/object.h"
#include "wx/stream.h"
-#if !USE_SHARED_LIBRARY
-IMPLEMENT_ABSTRACT_CLASS(wxInputStream, wxObject)
-IMPLEMENT_ABSTRACT_CLASS(wxOutputStream, wxObject)
-IMPLEMENT_ABSTRACT_CLASS2(wxStream, wxInputStream, wxOutputStream)
-IMPLEMENT_CLASS(wxFilterInputStream, wxInputStream)
-IMPLEMENT_CLASS(wxFilterOutputStream, wxOutputStream)
+#ifndef WX_PRECOMP
+ #include "wx/log.h"
#endif
+#include <ctype.h>
+#include "wx/datstrm.h"
+#include "wx/textfile.h"
+#include "wx/scopeguard.h"
+
+// ----------------------------------------------------------------------------
+// constants
+// ----------------------------------------------------------------------------
+
+// the temporary buffer size used when copying from stream to stream
+#define BUF_TEMP_SIZE 4096
+
+// ============================================================================
+// implementation
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// wxStreamBuffer
+// ----------------------------------------------------------------------------
+
+void wxStreamBuffer::SetError(wxStreamError err)
+{
+ if ( m_stream && m_stream->m_lasterror == wxSTREAM_NO_ERROR )
+ m_stream->m_lasterror = err;
+}
+
+void wxStreamBuffer::InitBuffer()
+{
+ m_buffer_start =
+ m_buffer_end =
+ m_buffer_pos = NULL;
+
+ // if we are going to allocate the buffer, we should free it later as well
+ m_destroybuf = true;
+}
+
+void wxStreamBuffer::Init()
+{
+ InitBuffer();
+
+ m_fixed = true;
+}
+
+void wxStreamBuffer::InitWithStream(wxStreamBase& stream, BufMode mode)
+{
+ Init();
+
+ m_stream = &stream;
+ m_mode = mode;
+
+ m_flushable = true;
+}
+
+wxStreamBuffer::wxStreamBuffer(BufMode mode)
+{
+ Init();
+
+ m_stream = NULL;
+ m_mode = mode;
+
+ m_flushable = false;
+}
+
+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,
+ wxT("it's a bad idea to copy this buffer") );
+
+ m_buffer_start = buffer.m_buffer_start;
+ m_buffer_end = buffer.m_buffer_end;
+ m_buffer_pos = buffer.m_buffer_pos;
+ m_fixed = buffer.m_fixed;
+ m_flushable = buffer.m_flushable;
+ m_stream = buffer.m_stream;
+ m_mode = buffer.m_mode;
+ m_destroybuf = false;
+}
+
+void wxStreamBuffer::FreeBuffer()
+{
+ if ( m_destroybuf )
+ {
+ free(m_buffer_start);
+ m_buffer_start = NULL;
+ }
+}
+
+wxStreamBuffer::~wxStreamBuffer()
+{
+ FreeBuffer();
+}
+
+wxInputStream *wxStreamBuffer::GetInputStream() const
+{
+ return m_mode == write ? NULL : (wxInputStream *)m_stream;
+}
+
+wxOutputStream *wxStreamBuffer::GetOutputStream() const
+{
+ return m_mode == read ? NULL : (wxOutputStream *)m_stream;
+}
+
+void wxStreamBuffer::SetBufferIO(void *buffer_start,
+ void *buffer_end,
+ bool takeOwnership)
+{
+ SetBufferIO(buffer_start, (char *)buffer_end - (char *)buffer_start,
+ takeOwnership);
+}
+
+void wxStreamBuffer::SetBufferIO(void *start,
+ size_t len,
+ bool takeOwnership)
+{
+ // start by freeing the old buffer
+ FreeBuffer();
+
+ m_buffer_start = (char *)start;
+ m_buffer_end = m_buffer_start + len;
+
+ // if we own it, we free it
+ m_destroybuf = takeOwnership;
+
+ ResetBuffer();
+}
+
+void wxStreamBuffer::SetBufferIO(size_t bufsize)
+{
+ if ( bufsize )
+ {
+ // this will free the old buffer and allocate the new one
+ SetBufferIO(malloc(bufsize), bufsize, true /* take ownership */);
+ }
+ else // no buffer size => no buffer
+ {
+ // still free the old one
+ FreeBuffer();
+ InitBuffer();
+ }
+}
+
+void wxStreamBuffer::ResetBuffer()
+{
+ if ( m_stream )
+ {
+ m_stream->Reset();
+ m_stream->m_lastcount = 0;
+ }
+
+ m_buffer_pos = m_mode == read && m_flushable
+ ? m_buffer_end
+ : 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, wxT("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()
+{
+ wxInputStream *inStream = GetInputStream();
+
+ // It's legal to have no stream, so we don't complain about it just return false
+ if ( !inStream )
+ return false;
+
+ size_t count = inStream->OnSysRead(GetBufferStart(), GetBufferSize());
+ if ( !count )
+ return false;
+
+ m_buffer_end = m_buffer_start + count;
+ m_buffer_pos = m_buffer_start;
+
+ return true;
+}
+
+// write the buffer contents to the stream (only for write buffers)
+bool wxStreamBuffer::FlushBuffer()
+{
+ 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 )
+ return false;
+
+ wxOutputStream *outStream = GetOutputStream();
+
+ 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);
+ if ( count != current )
+ return false;
+
+ m_buffer_pos = m_buffer_start;
+
+ return true;
+}
+
+size_t wxStreamBuffer::GetDataLeft()
+{
+ /* Why is this done? RR. */
+ if ( m_buffer_pos == m_buffer_end && m_flushable)
+ FillBuffer();
+
+ return GetBytesLeft();
+}
+
+// copy up to size bytes from our buffer into the provided one
+void wxStreamBuffer::GetFromBuffer(void *buffer, size_t size)
+{
+ // don't get more bytes than left in the buffer
+ size_t left = GetBytesLeft();
+
+ if ( size > left )
+ size = left;
+
+ memcpy(buffer, m_buffer_pos, size);
+ m_buffer_pos += size;
+}
+
+// copy the contents of the provided buffer into this one
+void wxStreamBuffer::PutToBuffer(const void *buffer, size_t size)
+{
+ size_t left = GetBytesLeft();
+
+ if ( size > left )
+ {
+ if ( m_fixed )
+ {
+ // we can't realloc the buffer, so just copy what we can
+ size = left;
+ }
+ else // !m_fixed
+ {
+ // realloc the buffer to have enough space for the data
+ if ( m_buffer_pos + size > m_buffer_end )
+ {
+ size_t delta = m_buffer_pos - m_buffer_start;
+ size_t new_size = delta + size;
+
+ 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 + new_size;
+ } // else: the buffer is big enough
+ }
+ }
+
+ memcpy(m_buffer_pos, buffer, size);
+ m_buffer_pos += size;
+}
+
+void wxStreamBuffer::PutChar(char c)
+{
+ wxOutputStream *outStream = GetOutputStream();
+
+ 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() )
+ {
+ outStream->OnSysWrite(&c, sizeof(c));
+ }
+ else
+ {
+ // otherwise check we have enough space left
+ if ( !GetDataLeft() && !FlushBuffer() )
+ {
+ // we don't
+ SetError(wxSTREAM_WRITE_ERROR);
+ }
+ else
+ {
+ PutToBuffer(&c, sizeof(c));
+ m_stream->m_lastcount = 1;
+ }
+ }
+}
+
+char wxStreamBuffer::Peek()
+{
+ wxCHECK_MSG( m_stream && HasBuffer(), 0,
+ wxT("should have the stream and the buffer in wxStreamBuffer") );
+
+ if ( !GetDataLeft() )
+ {
+ SetError(wxSTREAM_READ_ERROR);
+ return 0;
+ }
+
+ char c;
+ GetFromBuffer(&c, sizeof(c));
+ m_buffer_pos--;
+
+ return c;
+}
+
+char wxStreamBuffer::GetChar()
+{
+ wxInputStream *inStream = GetInputStream();
+
+ wxCHECK_MSG( inStream, 0, wxT("should have a stream in wxStreamBuffer") );
+
+ char c;
+ if ( !HasBuffer() )
+ {
+ inStream->OnSysRead(&c, sizeof(c));
+ }
+ else
+ {
+ if ( !GetDataLeft() )
+ {
+ SetError(wxSTREAM_READ_ERROR);
+ c = 0;
+ }
+ else
+ {
+ GetFromBuffer(&c, sizeof(c));
+ m_stream->m_lastcount = 1;
+ }
+ }
+
+ return c;
+}
+
+size_t wxStreamBuffer::Read(void *buffer, size_t size)
+{
+ wxASSERT_MSG( buffer, wxT("Warning: Null pointer is about to be used") );
+
+ /* Clear buffer first */
+ memset(buffer, 0x00, size);
+
+ // lasterror is reset before all new IO calls
+ if ( m_stream )
+ m_stream->Reset();
+
+ size_t readBytes;
+ if ( !HasBuffer() )
+ {
+ wxInputStream *inStream = GetInputStream();
+
+ wxCHECK_MSG( inStream, 0, wxT("should have a stream in wxStreamBuffer") );
+
+ readBytes = inStream->OnSysRead(buffer, size);
+ }
+ else // we have a buffer, use it
+ {
+ size_t orig_size = size;
+
+ while ( size > 0 )
+ {
+ size_t left = GetDataLeft();
+
+ // if the requested number of bytes if greater than the buffer
+ // size, read data in chunks
+ if ( size > left )
+ {
+ GetFromBuffer(buffer, left);
+ size -= left;
+ buffer = (char *)buffer + left;
+
+ if ( !FillBuffer() )
+ {
+ SetError(wxSTREAM_EOF);
+ break;
+ }
+ }
+ else // otherwise just do it in one gulp
+ {
+ GetFromBuffer(buffer, size);
+ size = 0;
+ }
+ }
+
+ readBytes = orig_size - size;
+ }
+
+ if ( m_stream )
+ m_stream->m_lastcount = readBytes;
+
+ return readBytes;
+}
+
+// this should really be called "Copy()"
+size_t wxStreamBuffer::Read(wxStreamBuffer *dbuf)
+{
+ wxCHECK_MSG( m_mode != write, 0, wxT("can't read from this buffer") );
+
+ char buf[BUF_TEMP_SIZE];
+ size_t nRead,
+ total = 0;
+
+ do
+ {
+ nRead = Read(buf, WXSIZEOF(buf));
+ if ( nRead )
+ {
+ nRead = dbuf->Write(buf, nRead);
+ total += nRead;
+ }
+ }
+ while ( nRead );
+
+ return total;
+}
+
+size_t wxStreamBuffer::Write(const void *buffer, size_t size)
+{
+ wxASSERT_MSG( buffer, wxT("Warning: Null pointer is about to be send") );
+
+ if (m_stream)
+ {
+ // lasterror is reset before all new IO calls
+ m_stream->Reset();
+ }
+
+ size_t ret;
+
+ if ( !HasBuffer() && m_fixed )
+ {
+ wxOutputStream *outStream = GetOutputStream();
+
+ 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);
+ }
+ else // we [may] have a buffer, use it
+ {
+ size_t orig_size = size;
+
+ while ( size > 0 )
+ {
+ size_t left = GetBytesLeft();
+
+ // if the buffer is too large to fit in the stream buffer, split
+ // it in smaller parts
+ //
+ // NB: If stream buffer isn't fixed (as for wxMemoryOutputStream),
+ // we always go to the second case.
+ //
+ // FIXME: fine, but if it fails we should (re)try writing it by
+ // chunks as this will (hopefully) always work (VZ)
+
+ if ( size > left && m_fixed )
+ {
+ PutToBuffer(buffer, left);
+ size -= left;
+ buffer = (char *)buffer + left;
+
+ if ( !FlushBuffer() )
+ {
+ SetError(wxSTREAM_WRITE_ERROR);
+
+ break;
+ }
+
+ m_buffer_pos = m_buffer_start;
+ }
+ else // we can do it in one gulp
+ {
+ PutToBuffer(buffer, size);
+ size = 0;
+ }
+ }
+
+ ret = orig_size - size;
+ }
+
+ if (m_stream)
+ {
+ // i am not entirely sure what we do this for
+ m_stream->m_lastcount = ret;
+ }
+
+ return ret;
+}
+
+size_t wxStreamBuffer::Write(wxStreamBuffer *sbuf)
+{
+ 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,
+ total = 0;
+
+ do
+ {
+ size_t nRead = sbuf->Read(buf, WXSIZEOF(buf));
+ if ( nRead )
+ {
+ nWrite = Write(buf, nRead);
+ if ( nWrite < nRead )
+ {
+ // put back data we couldn't copy
+ wxInputStream *in_stream = (wxInputStream *)sbuf->GetStream();
+
+ in_stream->Ungetch(buf + nWrite, nRead - nWrite);
+ }
+
+ total += nWrite;
+ }
+ else
+ {
+ nWrite = 0;
+ }
+ }
+ while ( nWrite == WXSIZEOF(buf) );
+
+ return total;
+}
+
+wxFileOffset wxStreamBuffer::Seek(wxFileOffset pos, wxSeekMode mode)
+{
+ wxFileOffset ret_off, diff;
+
+ wxFileOffset last_access = GetLastAccess();
+
+ if ( !m_flushable )
+ {
+ switch (mode)
+ {
+ case wxFromStart:
+ diff = pos;
+ break;
+
+ case wxFromCurrent:
+ diff = pos + GetIntPosition();
+ break;
+
+ case wxFromEnd:
+ diff = pos + last_access;
+ break;
+
+ default:
+ wxFAIL_MSG( wxT("invalid seek mode") );
+
+ return wxInvalidOffset;
+ }
+ if (diff < 0 || diff > last_access)
+ return wxInvalidOffset;
+ 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 diff;
+ }
+
+ 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) )
+ {
+ // We must take into account the fact that we have read
+ // something previously.
+ ret_off = m_stream->OnSysSeek(diff-last_access, wxFromCurrent);
+ ResetBuffer();
+ return ret_off;
+ }
+ else
+ {
+ 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 diff;
+ }
+
+ case wxFromEnd:
+ // Hard to compute: always seek to the requested position.
+ ret_off = m_stream->OnSysSeek(pos, wxFromEnd);
+ ResetBuffer();
+ return ret_off;
+ }
+
+ return wxInvalidOffset;
+}
+
+wxFileOffset wxStreamBuffer::Tell() const
+{
+ wxFileOffset pos;
+
+ // ask the stream for position if we have a real one
+ if ( m_stream )
+ {
+ pos = m_stream->OnSysTell();
+ if ( pos == wxInvalidOffset )
+ return wxInvalidOffset;
+ }
+ else // no associated stream
+ {
+ pos = 0;
+ }
+
+ pos += GetIntPosition();
+
+ if ( m_mode == read && m_flushable )
+ pos -= GetLastAccess();
+
+ return pos;
+}
+
+// ----------------------------------------------------------------------------
+// wxStreamBase
+// ----------------------------------------------------------------------------
+
+IMPLEMENT_ABSTRACT_CLASS(wxStreamBase, wxObject)
+
+wxStreamBase::wxStreamBase()
+{
+ m_lasterror = wxSTREAM_NO_ERROR;
+ m_lastcount = 0;
+}
+
+wxStreamBase::~wxStreamBase()
+{
+}
+
+size_t wxStreamBase::GetSize() const
+{
+ wxFileOffset length = GetLength();
+ if ( length == (wxFileOffset)wxInvalidOffset )
+ return 0;
+
+ const size_t len = wx_truncate_cast(size_t, length);
+ wxASSERT_MSG( len == length + size_t(0), wxT("large files not supported") );
+
+ return len;
+}
+
+wxFileOffset wxStreamBase::OnSysSeek(wxFileOffset WXUNUSED(seek), wxSeekMode WXUNUSED(mode))
+{
+ return wxInvalidOffset;
+}
+
+wxFileOffset wxStreamBase::OnSysTell() const
+{
+ return wxInvalidOffset;
+}
+
+// ----------------------------------------------------------------------------
+// wxInputStream
+// ----------------------------------------------------------------------------
+
+IMPLEMENT_ABSTRACT_CLASS(wxInputStream, wxStreamBase)
+
wxInputStream::wxInputStream()
- : wxObject()
{
+ m_wback = NULL;
+ m_wbacksize =
+ m_wbackcur = 0;
}
wxInputStream::~wxInputStream()
{
+ free(m_wback);
+}
+
+bool wxInputStream::CanRead() const
+{
+ // we don't know if there is anything to read or not and by default we
+ // prefer to be optimistic and try to read data unless we know for sure
+ // there is no more of it
+ return m_lasterror != wxSTREAM_EOF;
+}
+
+bool wxInputStream::Eof() const
+{
+ // the only way the base class can know we're at EOF is when we'd already
+ // tried to read beyond it in which case last error is set accordingly
+ return GetLastError() == wxSTREAM_EOF;
+}
+
+char *wxInputStream::AllocSpaceWBack(size_t needed_size)
+{
+ // get number of bytes left from previous wback buffer
+ size_t toget = m_wbacksize - m_wbackcur;
+
+ // allocate a buffer large enough to hold prev + new data
+ char *temp_b = (char *)malloc(needed_size + toget);
+
+ if (!temp_b)
+ return NULL;
+
+ // copy previous data (and free old buffer) if needed
+ if (m_wback)
+ {
+ memmove(temp_b + needed_size, m_wback + m_wbackcur, toget);
+ free(m_wback);
+ }
+
+ // done
+ m_wback = temp_b;
+ m_wbackcur = 0;
+ m_wbacksize = needed_size + toget;
+
+ return m_wback;
}
-#define BUF_TEMP_SIZE 10000
+size_t wxInputStream::GetWBack(void *buf, size_t size)
+{
+ wxASSERT_MSG( buf, wxT("Warning: Null pointer is about to be used") );
+
+ /* Clear buffer first */
+ memset(buf, 0x00, size);
+
+ if (!m_wback)
+ return 0;
+
+ // how many bytes do we have in the buffer?
+ size_t toget = m_wbacksize - m_wbackcur;
+
+ if ( size < toget )
+ {
+ // we won't read everything
+ toget = size;
+ }
+
+ // copy the data from the cache
+ memcpy(buf, m_wback + m_wbackcur, toget);
+
+ m_wbackcur += toget;
+ if ( m_wbackcur == m_wbacksize )
+ {
+ // TODO: should we really free it here all the time? maybe keep it?
+ free(m_wback);
+ m_wback = NULL;
+ m_wbacksize = 0;
+ m_wbackcur = 0;
+ }
+
+ // return the number of bytes copied
+ return toget;
+}
+
+size_t wxInputStream::Ungetch(const void *buf, size_t bufsize)
+{
+ wxASSERT_MSG( buf, wxT("Warning: Null pointer is about to be used in Ungetch()") );
+
+ if ( m_lasterror != wxSTREAM_NO_ERROR && m_lasterror != wxSTREAM_EOF )
+ {
+ // can't operate on this stream until the error is cleared
+ return 0;
+ }
+
+ char *ptrback = AllocSpaceWBack(bufsize);
+ if (!ptrback)
+ return 0;
+
+ // Eof() shouldn't return true any longer
+ if ( m_lasterror == wxSTREAM_EOF )
+ m_lasterror = wxSTREAM_NO_ERROR;
+
+ memcpy(ptrback, buf, bufsize);
+ return bufsize;
+}
+
+bool wxInputStream::Ungetch(char c)
+{
+ return Ungetch(&c, sizeof(c)) != 0;
+}
+
+int wxInputStream::GetC()
+{
+ unsigned char c;
+ Read(&c, sizeof(c));
+ return LastRead() ? c : wxEOF;
+}
+
+wxInputStream& wxInputStream::Read(void *buf, size_t size)
+{
+ wxASSERT_MSG( buf, wxT("Warning: Null pointer is about to be read") );
+
+ char *p = (char *)buf;
+ m_lastcount = 0;
+
+ size_t read = GetWBack(buf, size);
+ for ( ;; )
+ {
+ size -= read;
+ m_lastcount += read;
+ p += read;
+
+ if ( !size )
+ {
+ // we read the requested amount of data
+ break;
+ }
+
+ if ( p != buf && !CanRead() )
+ {
+ // we have already read something and we would block in OnSysRead()
+ // now: don't do it but return immediately
+ break;
+ }
+
+ read = OnSysRead(p, size);
+ if ( !read )
+ {
+ // no more data available
+ break;
+ }
+ }
+
+ return *this;
+}
+
+char wxInputStream::Peek()
+{
+ char c;
+ Read(&c, sizeof(c));
+ if (m_lasterror == wxSTREAM_NO_ERROR)
+ {
+ Ungetch(c);
+ return c;
+ }
+
+ return 0;
+}
wxInputStream& wxInputStream::Read(wxOutputStream& stream_out)
{
- char buf[BUF_TEMP_SIZE];
- size_t bytes_read = BUF_TEMP_SIZE;
+ size_t lastcount = 0;
+ char buf[BUF_TEMP_SIZE];
- while (bytes_read == BUF_TEMP_SIZE && !stream_out.Bad()) {
- bytes_read = Read(buf, bytes_read).LastRead();
+ for ( ;; )
+ {
+ size_t bytes_read = Read(buf, WXSIZEOF(buf)).LastRead();
+ if ( !bytes_read )
+ break;
- stream_out.Write(buf, bytes_read);
- }
- return *this;
+ if ( stream_out.Write(buf, bytes_read).LastWrite() != bytes_read )
+ break;
+
+ lastcount += bytes_read;
+ }
+
+ m_lastcount = lastcount;
+
+ return *this;
+}
+
+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 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 sought 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
+ and the data would be corrupted.
+
+ GRG: Could add code here to try to navigate within the wback
+ buffer if possible, but is it really needed? It would only work
+ when seeking in wxFromCurrent mode, else it would invalidate
+ anyway... */
+
+ if (m_wback)
+ {
+ wxLogDebug( wxT("Seeking in stream which has data written back to it.") );
+
+ free(m_wback);
+ m_wback = NULL;
+ m_wbacksize = 0;
+ m_wbackcur = 0;
+ }
+
+ return OnSysSeek(pos, mode);
+}
+
+wxFileOffset wxInputStream::TellI() const
+{
+ wxFileOffset pos = OnSysTell();
+
+ if (pos != wxInvalidOffset)
+ pos -= (m_wbacksize - m_wbackcur);
+
+ return pos;
}
+
+// ----------------------------------------------------------------------------
+// wxOutputStream
+// ----------------------------------------------------------------------------
+
+IMPLEMENT_ABSTRACT_CLASS(wxOutputStream, wxStreamBase)
+
wxOutputStream::wxOutputStream()
- : wxObject()
{
}
{
}
+size_t wxOutputStream::OnSysWrite(const void * WXUNUSED(buffer),
+ size_t WXUNUSED(bufsize))
+{
+ return 0;
+}
+
+void wxOutputStream::PutC(char c)
+{
+ Write(&c, sizeof(c));
+}
+
+wxOutputStream& wxOutputStream::Write(const void *buffer, size_t size)
+{
+ m_lastcount = OnSysWrite(buffer, size);
+ return *this;
+}
+
wxOutputStream& wxOutputStream::Write(wxInputStream& stream_in)
{
- stream_in.Read(*this);
- return *this;
+ stream_in.Read(*this);
+ return *this;
+}
+
+wxFileOffset wxOutputStream::TellO() const
+{
+ return OnSysTell();
+}
+
+wxFileOffset wxOutputStream::SeekO(wxFileOffset pos, wxSeekMode mode)
+{
+ return OnSysSeek(pos, mode);
+}
+
+void wxOutputStream::Sync()
+{
+}
+
+
+// ----------------------------------------------------------------------------
+// wxCountingOutputStream
+// ----------------------------------------------------------------------------
+
+IMPLEMENT_DYNAMIC_CLASS(wxCountingOutputStream, wxOutputStream)
+
+wxCountingOutputStream::wxCountingOutputStream ()
+{
+ m_currentPos = 0;
+}
+
+wxFileOffset wxCountingOutputStream::GetLength() const
+{
+ return m_lastcount;
+}
+
+size_t wxCountingOutputStream::OnSysWrite(const void *WXUNUSED(buffer),
+ size_t size)
+{
+ m_currentPos += size;
+ if (m_currentPos > m_lastcount)
+ m_lastcount = m_currentPos;
+
+ return m_currentPos;
+}
+
+wxFileOffset wxCountingOutputStream::OnSysSeek(wxFileOffset pos, wxSeekMode mode)
+{
+ ssize_t new_pos = wx_truncate_cast(ssize_t, pos);
+
+ switch ( mode )
+ {
+ case wxFromStart:
+ wxCHECK_MSG( (wxFileOffset)new_pos == pos, wxInvalidOffset, wxT("huge position not supported") );
+ break;
+
+ case wxFromEnd:
+ new_pos = m_lastcount + new_pos;
+ wxCHECK_MSG( (wxFileOffset)new_pos == (wxFileOffset)(m_lastcount + pos), wxInvalidOffset, wxT("huge position not supported") );
+ break;
+
+ case wxFromCurrent:
+ new_pos = m_currentPos + new_pos;
+ wxCHECK_MSG( (wxFileOffset)new_pos == (wxFileOffset)(m_currentPos + pos), wxInvalidOffset, wxT("huge position not supported") );
+ break;
+
+ default:
+ wxFAIL_MSG( wxT("invalid seek mode") );
+ return wxInvalidOffset;
+ }
+
+ m_currentPos = new_pos;
+
+ if (m_currentPos > m_lastcount)
+ m_lastcount = m_currentPos;
+
+ return m_currentPos;
+}
+
+wxFileOffset wxCountingOutputStream::OnSysTell() const
+{
+ return m_currentPos;
+}
+
+// ----------------------------------------------------------------------------
+// wxFilterInputStream
+// ----------------------------------------------------------------------------
+
+IMPLEMENT_ABSTRACT_CLASS(wxFilterInputStream, wxInputStream)
+
+wxFilterInputStream::wxFilterInputStream()
+ : m_parent_i_stream(NULL),
+ m_owns(false)
+{
}
wxFilterInputStream::wxFilterInputStream(wxInputStream& stream)
- : wxInputStream()
+ : 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)
{
}
wxFilterOutputStream::wxFilterOutputStream(wxOutputStream& stream)
- : wxOutputStream()
+ : m_parent_o_stream(&stream),
+ m_owns(false)
+{
+}
+
+wxFilterOutputStream::wxFilterOutputStream(wxOutputStream *stream)
+ : m_parent_o_stream(stream),
+ m_owns(true)
+{
+}
+
+bool wxFilterOutputStream::Close()
{
- m_parent_o_stream = &stream;
+ 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;
+}
+
+// ----------------------------------------------------------------------------
+// wxFilterClassFactoryBase
+// ----------------------------------------------------------------------------
+
+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
+{
+ for (const wxChar *const *p = GetProtocols(wxSTREAM_FILEEXT); *p; p++)
+ {
+ if ( location.EndsWith(*p) )
+ return location.length() - wxStrlen(*p);
+ }
+
+ 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)
+ {
+ wxFilterClassFactory **pp = &sm_first;
+
+ 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 <typename T>
+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(),
+ wxFromCurrent);
+
+ delete m_i_streambuf;
+}
+
+char wxBufferedInputStream::Peek()
+{
+ return m_i_streambuf->Peek();
+}
+
+wxInputStream& wxBufferedInputStream::Read(void *buf, size_t size)
+{
+ // reset the error flag
+ Reset();
+
+ // first read from the already cached data
+ m_lastcount = GetWBack(buf, size);
+
+ // do we have to read anything more?
+ if ( m_lastcount < size )
+ {
+ size -= m_lastcount;
+ buf = (char *)buf + m_lastcount;
+
+ // 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;
+
+ // 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;
+ }
+
+ return *this;
+}
+
+wxFileOffset wxBufferedInputStream::SeekI(wxFileOffset pos, wxSeekMode mode)
+{
+ // RR: Look at wxInputStream for comments.
+
+ if (m_lasterror==wxSTREAM_EOF)
+ Reset();
+
+ if (m_wback)
+ {
+ wxLogDebug( wxT("Seeking in stream which has data written back to it.") );
+
+ free(m_wback);
+ m_wback = NULL;
+ m_wbacksize = 0;
+ m_wbackcur = 0;
+ }
+
+ return m_i_streambuf->Seek(pos, mode);
+}
+
+wxFileOffset wxBufferedInputStream::TellI() const
+{
+ wxFileOffset pos = m_i_streambuf->Tell();
+
+ if (pos != wxInvalidOffset)
+ pos -= (m_wbacksize - m_wbackcur);
+
+ return pos;
+}
+
+size_t wxBufferedInputStream::OnSysRead(void *buffer, size_t bufsize)
+{
+ return m_parent_i_stream->Read(buffer, bufsize).LastRead();
+}
+
+wxFileOffset wxBufferedInputStream::OnSysSeek(wxFileOffset seek, wxSeekMode mode)
+{
+ return m_parent_i_stream->SeekI(seek, mode);
+}
+
+wxFileOffset wxBufferedInputStream::OnSysTell() const
+{
+ return m_parent_i_stream->TellI();
+}
+
+void wxBufferedInputStream::SetInputStreamBuffer(wxStreamBuffer *buffer)
+{
+ wxCHECK_RET( buffer, wxT("wxBufferedInputStream needs buffer") );
+
+ delete m_i_streambuf;
+ m_i_streambuf = buffer;
+}
+
+// ----------------------------------------------------------------------------
+// wxBufferedOutputStream
+// ----------------------------------------------------------------------------
+
+wxBufferedOutputStream::wxBufferedOutputStream(wxOutputStream& stream,
+ wxStreamBuffer *buffer)
+ : wxFilterOutputStream(stream)
+{
+ m_o_streambuf = CreateBufferIfNeeded(*this, buffer);
+}
+
+wxBufferedOutputStream::wxBufferedOutputStream(wxOutputStream& stream,
+ size_t bufsize)
+ : wxFilterOutputStream(stream)
+{
+ m_o_streambuf = CreateBufferIfNeeded(*this, NULL, bufsize);
+}
+
+wxBufferedOutputStream::~wxBufferedOutputStream()
+{
+ Sync();
+ delete m_o_streambuf;
+}
+
+bool wxBufferedOutputStream::Close()
+{
+ Sync();
+ return IsOk();
+}
+
+
+wxOutputStream& wxBufferedOutputStream::Write(const void *buffer, size_t size)
+{
+ m_lastcount = 0;
+ m_o_streambuf->Write(buffer, size);
+ return *this;
+}
+
+wxFileOffset wxBufferedOutputStream::SeekO(wxFileOffset pos, wxSeekMode mode)
+{
+ Sync();
+ return m_o_streambuf->Seek(pos, mode);
+}
+
+wxFileOffset wxBufferedOutputStream::TellO() const
+{
+ return m_o_streambuf->Tell();
+}
+
+void wxBufferedOutputStream::Sync()
+{
+ m_o_streambuf->FlushBuffer();
+ m_parent_o_stream->Sync();
+}
+
+size_t wxBufferedOutputStream::OnSysWrite(const void *buffer, size_t bufsize)
+{
+ return m_parent_o_stream->Write(buffer, bufsize).LastWrite();
+}
+
+wxFileOffset wxBufferedOutputStream::OnSysSeek(wxFileOffset seek, wxSeekMode mode)
+{
+ return m_parent_o_stream->SeekO(seek, mode);
+}
+
+wxFileOffset wxBufferedOutputStream::OnSysTell() const
+{
+ return m_parent_o_stream->TellO();
+}
+
+wxFileOffset wxBufferedOutputStream::GetLength() const
+{
+ return m_parent_o_stream->GetLength() + m_o_streambuf->GetIntPosition();
+}
+
+void wxBufferedOutputStream::SetOutputStreamBuffer(wxStreamBuffer *buffer)
+{
+ wxCHECK_RET( buffer, wxT("wxBufferedOutputStream needs buffer") );
+
+ delete m_o_streambuf;
+ m_o_streambuf = buffer;
+}
+
+// ---------------------------------------------------------------------------
+// wxWrapperInputStream implementation
+// ---------------------------------------------------------------------------
+
+wxWrapperInputStream::wxWrapperInputStream()
+{
+ m_lasterror = wxSTREAM_READ_ERROR;
+}
+
+wxWrapperInputStream::wxWrapperInputStream(wxInputStream& stream)
+ : wxFilterInputStream(stream)
+{
+ SynchronizeLastError();
+}
+
+wxWrapperInputStream::wxWrapperInputStream(wxInputStream *stream)
+ : wxFilterInputStream(stream)
+{
+ if ( m_parent_i_stream )
+ SynchronizeLastError();
+ else
+ m_lasterror = wxSTREAM_READ_ERROR;
+}
+
+void wxWrapperInputStream::InitParentStream(wxInputStream& stream)
+{
+ wxCHECK_RET( !m_parent_i_stream, "Can't init parent stream twice" );
+
+ m_parent_i_stream = &stream;
+
+ SynchronizeLastError();
+}
+
+void wxWrapperInputStream::InitParentStream(wxInputStream* stream)
+{
+ wxCHECK_RET( !m_parent_i_stream, "Can't init parent stream twice" );
+
+ m_parent_i_stream = stream;
+
+ if ( m_parent_i_stream )
+ {
+ m_owns = true;
+
+ SynchronizeLastError();
+ }
+}
+
+wxFileOffset wxWrapperInputStream::GetLength() const
+{
+ wxCHECK_MSG(m_parent_i_stream, wxInvalidOffset, "Stream not valid");
+
+ wxON_BLOCK_EXIT_THIS0(wxWrapperInputStream::SynchronizeLastError);
+ return m_parent_i_stream->GetLength();
+}
+
+bool wxWrapperInputStream::IsSeekable() const
+{
+ wxCHECK_MSG(m_parent_i_stream, false, "Stream not valid");
+ return m_parent_i_stream->IsSeekable();
+}
+
+size_t wxWrapperInputStream::OnSysRead(void *buffer, size_t size)
+{
+ wxCHECK_MSG(m_parent_i_stream, false, "Stream not valid");
+
+ wxON_BLOCK_EXIT_THIS0(wxWrapperInputStream::SynchronizeLastError);
+
+ m_parent_i_stream->Read(buffer, size);
+ return m_parent_i_stream->LastRead();
+}
+
+wxFileOffset wxWrapperInputStream::OnSysSeek(wxFileOffset pos, wxSeekMode mode)
+{
+ wxCHECK_MSG(IsSeekable(), false, "Stream not seekable");
+
+ wxON_BLOCK_EXIT_THIS0(wxWrapperInputStream::SynchronizeLastError);
+ return m_parent_i_stream->SeekI (pos, mode);
+}
+
+wxFileOffset wxWrapperInputStream::OnSysTell() const
+{
+ wxCHECK_MSG(m_parent_i_stream, false, "Stream not valid");
+
+ wxON_BLOCK_EXIT_THIS0(wxWrapperInputStream::SynchronizeLastError);
+ return m_parent_i_stream->TellI();
+}
+
+// ----------------------------------------------------------------------------
+// Some IOManip function
+// ----------------------------------------------------------------------------
+
+wxOutputStream& wxEndL(wxOutputStream& stream)
+{
+ static const wxChar *eol = wxTextFile::GetEOL();
+
+ return stream.Write(eol, wxStrlen(eol));
+}
+
+#endif // wxUSE_STREAMS
projects / wxWidgets.git / blobdiff