610 lines
20 KiB
C++
610 lines
20 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: wx/stream.h
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// Purpose: stream classes
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// Author: Guilhem Lavaux, Guillermo Rodriguez Garcia, Vadim Zeitlin
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// Modified by:
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// Created: 11/07/98
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// RCS-ID: $Id: stream.h 53135 2008-04-12 02:31:04Z VZ $
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// Copyright: (c) Guilhem Lavaux
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_WXSTREAM_H__
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#define _WX_WXSTREAM_H__
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#include "wx/defs.h"
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#if wxUSE_STREAMS
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#include <stdio.h>
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#include "wx/object.h"
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#include "wx/string.h"
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#include "wx/filefn.h" // for wxFileOffset, wxInvalidOffset and wxSeekMode
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class WXDLLIMPEXP_FWD_BASE wxStreamBase;
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class WXDLLIMPEXP_FWD_BASE wxInputStream;
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class WXDLLIMPEXP_FWD_BASE wxOutputStream;
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typedef wxInputStream& (*__wxInputManip)(wxInputStream&);
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typedef wxOutputStream& (*__wxOutputManip)(wxOutputStream&);
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WXDLLIMPEXP_BASE wxOutputStream& wxEndL(wxOutputStream& o_stream);
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// ----------------------------------------------------------------------------
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// constants
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// ----------------------------------------------------------------------------
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enum wxStreamError
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{
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wxSTREAM_NO_ERROR = 0, // stream is in good state
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wxSTREAM_EOF, // EOF reached in Read() or similar
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wxSTREAM_WRITE_ERROR, // generic write error
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wxSTREAM_READ_ERROR // generic read error
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};
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const int wxEOF = -1;
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// ============================================================================
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// base stream classes: wxInputStream and wxOutputStream
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// ============================================================================
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// ---------------------------------------------------------------------------
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// wxStreamBase: common (but non virtual!) base for all stream classes
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// ---------------------------------------------------------------------------
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class WXDLLIMPEXP_BASE wxStreamBase
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{
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public:
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wxStreamBase();
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virtual ~wxStreamBase();
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// error testing
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wxStreamError GetLastError() const { return m_lasterror; }
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virtual bool IsOk() const { return GetLastError() == wxSTREAM_NO_ERROR; }
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bool operator!() const { return !IsOk(); }
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// reset the stream state
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void Reset() { m_lasterror = wxSTREAM_NO_ERROR; }
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// this doesn't make sense for all streams, always test its return value
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virtual size_t GetSize() const;
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virtual wxFileOffset GetLength() const { return wxInvalidOffset; }
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// returns true if the streams supports seeking to arbitrary offsets
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virtual bool IsSeekable() const { return false; }
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protected:
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virtual wxFileOffset OnSysSeek(wxFileOffset seek, wxSeekMode mode);
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virtual wxFileOffset OnSysTell() const;
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size_t m_lastcount;
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wxStreamError m_lasterror;
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friend class wxStreamBuffer;
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DECLARE_NO_COPY_CLASS(wxStreamBase)
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};
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// ----------------------------------------------------------------------------
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// wxInputStream: base class for the input streams
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// ----------------------------------------------------------------------------
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class WXDLLIMPEXP_BASE wxInputStream : public wxStreamBase
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{
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public:
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// ctor and dtor, nothing exciting
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wxInputStream();
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virtual ~wxInputStream();
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// IO functions
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// ------------
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// return a character from the stream without removing it, i.e. it will
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// still be returned by the next call to GetC()
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//
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// blocks until something appears in the stream if necessary, if nothing
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// ever does (i.e. EOF) LastRead() will return 0 (and the return value is
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// undefined), otherwise 1
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virtual char Peek();
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// return one byte from the stream, blocking until it appears if
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// necessary
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//
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// on success returns a value between 0 - 255, or wxEOF on EOF or error.
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int GetC();
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// read at most the given number of bytes from the stream
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//
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// there are 2 possible situations here: either there is nothing at all in
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// the stream right now in which case Read() blocks until something appears
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// (use CanRead() to avoid this) or there is already some data available in
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// the stream and then Read() doesn't block but returns just the data it
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// can read without waiting for more
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//
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// in any case, if there are not enough bytes in the stream right now,
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// LastRead() value will be less than size but greater than 0. If it is 0,
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// it means that EOF has been reached.
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virtual wxInputStream& Read(void *buffer, size_t size);
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// copy the entire contents of this stream into streamOut, stopping only
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// when EOF is reached or an error occurs
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wxInputStream& Read(wxOutputStream& streamOut);
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// status functions
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// ----------------
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// returns the number of bytes read by the last call to Read(), GetC() or
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// Peek()
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//
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// this should be used to discover whether that call succeeded in reading
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// all the requested data or not
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virtual size_t LastRead() const { return wxStreamBase::m_lastcount; }
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// returns true if some data is available in the stream right now, so that
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// calling Read() wouldn't block
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virtual bool CanRead() const;
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// is the stream at EOF?
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//
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// note that this cannot be really implemented for all streams and
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// CanRead() is more reliable than Eof()
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virtual bool Eof() const;
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// write back buffer
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// -----------------
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// put back the specified number of bytes into the stream, they will be
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// fetched by the next call to the read functions
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//
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// returns the number of bytes really stuffed back
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size_t Ungetch(const void *buffer, size_t size);
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// put back the specified character in the stream
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//
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// returns true if ok, false on error
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bool Ungetch(char c);
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// position functions
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// ------------------
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// move the stream pointer to the given position (if the stream supports
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// it)
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//
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// returns wxInvalidOffset on error
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virtual wxFileOffset SeekI(wxFileOffset pos, wxSeekMode mode = wxFromStart);
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// return the current position of the stream pointer or wxInvalidOffset
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virtual wxFileOffset TellI() const;
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// stream-like operators
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// ---------------------
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wxInputStream& operator>>(wxOutputStream& out) { return Read(out); }
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wxInputStream& operator>>(__wxInputManip func) { return func(*this); }
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protected:
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// do read up to size bytes of data into the provided buffer
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//
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// this method should return 0 if EOF has been reached or an error occurred
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// (m_lasterror should be set accordingly as well) or the number of bytes
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// read
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virtual size_t OnSysRead(void *buffer, size_t size) = 0;
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// write-back buffer support
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// -------------------------
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// return the pointer to a buffer big enough to hold sizeNeeded bytes
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char *AllocSpaceWBack(size_t sizeNeeded);
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// read up to size data from the write back buffer, return the number of
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// bytes read
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size_t GetWBack(void *buf, size_t size);
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// write back buffer or NULL if none
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char *m_wback;
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// the size of the buffer
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size_t m_wbacksize;
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// the current position in the buffer
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size_t m_wbackcur;
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friend class wxStreamBuffer;
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DECLARE_NO_COPY_CLASS(wxInputStream)
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};
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// ----------------------------------------------------------------------------
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// wxOutputStream: base for the output streams
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// ----------------------------------------------------------------------------
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class WXDLLIMPEXP_BASE wxOutputStream : public wxStreamBase
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{
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public:
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wxOutputStream();
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virtual ~wxOutputStream();
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void PutC(char c);
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virtual wxOutputStream& Write(const void *buffer, size_t size);
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wxOutputStream& Write(wxInputStream& stream_in);
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virtual wxFileOffset SeekO(wxFileOffset pos, wxSeekMode mode = wxFromStart);
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virtual wxFileOffset TellO() const;
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virtual size_t LastWrite() const { return wxStreamBase::m_lastcount; }
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virtual void Sync();
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virtual bool Close() { return true; }
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wxOutputStream& operator<<(wxInputStream& out) { return Write(out); }
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wxOutputStream& operator<<( __wxOutputManip func) { return func(*this); }
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protected:
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// to be implemented in the derived classes (it should have been pure
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// virtual)
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virtual size_t OnSysWrite(const void *buffer, size_t bufsize);
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friend class wxStreamBuffer;
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DECLARE_NO_COPY_CLASS(wxOutputStream)
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};
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// ============================================================================
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// helper stream classes
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// ============================================================================
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// ---------------------------------------------------------------------------
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// A stream for measuring streamed output
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// ---------------------------------------------------------------------------
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class WXDLLIMPEXP_BASE wxCountingOutputStream : public wxOutputStream
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{
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public:
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wxCountingOutputStream();
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wxFileOffset GetLength() const;
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bool Ok() const { return IsOk(); }
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bool IsOk() const { return true; }
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protected:
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virtual size_t OnSysWrite(const void *buffer, size_t size);
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virtual wxFileOffset OnSysSeek(wxFileOffset pos, wxSeekMode mode);
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virtual wxFileOffset OnSysTell() const;
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size_t m_currentPos;
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DECLARE_NO_COPY_CLASS(wxCountingOutputStream)
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};
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// ---------------------------------------------------------------------------
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// "Filter" streams
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// ---------------------------------------------------------------------------
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class WXDLLIMPEXP_BASE wxFilterInputStream : public wxInputStream
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{
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public:
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wxFilterInputStream();
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wxFilterInputStream(wxInputStream& stream);
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wxFilterInputStream(wxInputStream *stream);
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virtual ~wxFilterInputStream();
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char Peek() { return m_parent_i_stream->Peek(); }
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wxFileOffset GetLength() const { return m_parent_i_stream->GetLength(); }
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wxInputStream *GetFilterInputStream() const { return m_parent_i_stream; }
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protected:
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wxInputStream *m_parent_i_stream;
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bool m_owns;
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DECLARE_NO_COPY_CLASS(wxFilterInputStream)
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};
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class WXDLLIMPEXP_BASE wxFilterOutputStream : public wxOutputStream
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{
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public:
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wxFilterOutputStream();
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wxFilterOutputStream(wxOutputStream& stream);
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wxFilterOutputStream(wxOutputStream *stream);
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virtual ~wxFilterOutputStream();
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wxFileOffset GetLength() const { return m_parent_o_stream->GetLength(); }
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wxOutputStream *GetFilterOutputStream() const { return m_parent_o_stream; }
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bool Close();
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protected:
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wxOutputStream *m_parent_o_stream;
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bool m_owns;
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DECLARE_NO_COPY_CLASS(wxFilterOutputStream)
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};
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enum wxStreamProtocolType
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{
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wxSTREAM_PROTOCOL, // wxFileSystem protocol (should be only one)
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wxSTREAM_MIMETYPE, // MIME types the stream handles
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wxSTREAM_ENCODING, // The HTTP Content-Encodings the stream handles
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wxSTREAM_FILEEXT // File extensions the stream handles
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};
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void WXDLLIMPEXP_BASE wxUseFilterClasses();
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class WXDLLIMPEXP_BASE wxFilterClassFactoryBase : public wxObject
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{
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public:
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virtual ~wxFilterClassFactoryBase() { }
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wxString GetProtocol() const { return wxString(*GetProtocols()); }
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wxString PopExtension(const wxString& location) const;
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virtual const wxChar * const *GetProtocols(wxStreamProtocolType type
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= wxSTREAM_PROTOCOL) const = 0;
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bool CanHandle(const wxChar *protocol,
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wxStreamProtocolType type
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= wxSTREAM_PROTOCOL) const;
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protected:
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wxString::size_type FindExtension(const wxChar *location) const;
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DECLARE_ABSTRACT_CLASS(wxFilterClassFactoryBase)
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};
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class WXDLLIMPEXP_BASE wxFilterClassFactory : public wxFilterClassFactoryBase
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{
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public:
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virtual ~wxFilterClassFactory() { }
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virtual wxFilterInputStream *NewStream(wxInputStream& stream) const = 0;
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virtual wxFilterOutputStream *NewStream(wxOutputStream& stream) const = 0;
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virtual wxFilterInputStream *NewStream(wxInputStream *stream) const = 0;
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virtual wxFilterOutputStream *NewStream(wxOutputStream *stream) const = 0;
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static const wxFilterClassFactory *Find(const wxChar *protocol,
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wxStreamProtocolType type
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= wxSTREAM_PROTOCOL);
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static const wxFilterClassFactory *GetFirst();
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const wxFilterClassFactory *GetNext() const { return m_next; }
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void PushFront() { Remove(); m_next = sm_first; sm_first = this; }
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void Remove();
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protected:
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wxFilterClassFactory() : m_next(this) { }
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wxFilterClassFactory& operator=(const wxFilterClassFactory&)
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{ return *this; }
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private:
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static wxFilterClassFactory *sm_first;
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wxFilterClassFactory *m_next;
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DECLARE_ABSTRACT_CLASS(wxFilterClassFactory)
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};
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// ============================================================================
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// buffered streams
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// ============================================================================
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// ---------------------------------------------------------------------------
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// Stream buffer: this class can be derived from and passed to
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// wxBufferedStreams to implement custom buffering
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// ---------------------------------------------------------------------------
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class WXDLLIMPEXP_BASE wxStreamBuffer
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{
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public:
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enum BufMode
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{
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read,
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write,
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read_write
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};
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wxStreamBuffer(wxStreamBase& stream, BufMode mode);
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wxStreamBuffer(const wxStreamBuffer& buf);
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virtual ~wxStreamBuffer();
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// Filtered IO
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virtual size_t Read(void *buffer, size_t size);
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size_t Read(wxStreamBuffer *buf);
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virtual size_t Write(const void *buffer, size_t size);
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size_t Write(wxStreamBuffer *buf);
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virtual char Peek();
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virtual char GetChar();
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virtual void PutChar(char c);
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virtual wxFileOffset Tell() const;
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virtual wxFileOffset Seek(wxFileOffset pos, wxSeekMode mode);
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// Buffer control
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void ResetBuffer();
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// NB: the buffer must always be allocated with malloc() if takeOwn is
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// true as it will be deallocated by free()
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void SetBufferIO(void *start, void *end, bool takeOwnership = false);
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void SetBufferIO(void *start, size_t len, bool takeOwnership = false);
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void SetBufferIO(size_t bufsize);
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void *GetBufferStart() const { return m_buffer_start; }
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void *GetBufferEnd() const { return m_buffer_end; }
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void *GetBufferPos() const { return m_buffer_pos; }
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size_t GetBufferSize() const { return m_buffer_size; }
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size_t GetIntPosition() const { return m_buffer_pos - m_buffer_start; }
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void SetIntPosition(size_t pos) { m_buffer_pos = m_buffer_start + pos; }
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size_t GetLastAccess() const { return m_buffer_end - m_buffer_start; }
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size_t GetBytesLeft() const { return m_buffer_end - m_buffer_pos; }
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void Fixed(bool fixed) { m_fixed = fixed; }
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void Flushable(bool f) { m_flushable = f; }
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bool FlushBuffer();
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bool FillBuffer();
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size_t GetDataLeft();
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// misc accessors
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wxStreamBase *GetStream() const { return m_stream; }
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bool HasBuffer() const { return m_buffer_size != 0; }
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bool IsFixed() const { return m_fixed; }
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bool IsFlushable() const { return m_flushable; }
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// only for input/output buffers respectively, returns NULL otherwise
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wxInputStream *GetInputStream() const;
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wxOutputStream *GetOutputStream() const;
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#if WXWIN_COMPATIBILITY_2_6
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// deprecated, for compatibility only
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wxDEPRECATED( wxStreamBase *Stream() );
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#endif // WXWIN_COMPATIBILITY_2_6
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// this constructs a dummy wxStreamBuffer, used by (and exists for)
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// wxMemoryStreams only, don't use!
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wxStreamBuffer(BufMode mode);
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protected:
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void GetFromBuffer(void *buffer, size_t size);
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void PutToBuffer(const void *buffer, size_t size);
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// set the last error to the specified value if we didn't have it before
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void SetError(wxStreamError err);
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// common part of several ctors
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void Init();
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// init buffer variables to be empty
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void InitBuffer();
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// free the buffer (always safe to call)
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void FreeBuffer();
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// the buffer itself: the pointers to its start and end and the current
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// position in the buffer
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char *m_buffer_start,
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*m_buffer_end,
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*m_buffer_pos;
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// the buffer size
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// FIXME: isn't it the same as m_buffer_end - m_buffer_start? (VZ)
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size_t m_buffer_size;
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// the stream we're associated with
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wxStreamBase *m_stream;
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// its mode
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BufMode m_mode;
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// flags
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bool m_destroybuf, // deallocate buffer?
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m_fixed,
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m_flushable;
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private:
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// Cannot use
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// DECLARE_NO_COPY_CLASS(wxStreamBuffer)
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// because copy constructor is explicitly declared above;
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// but no copy assignment operator is defined, so declare
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// it private to prevent the compiler from defining it:
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wxStreamBuffer& operator=(const wxStreamBuffer&);
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};
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// ---------------------------------------------------------------------------
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// wxBufferedInputStream
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// ---------------------------------------------------------------------------
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class WXDLLIMPEXP_BASE wxBufferedInputStream : public wxFilterInputStream
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{
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public:
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// if a non NULL buffer is given to the stream, it will be deleted by it
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wxBufferedInputStream(wxInputStream& stream,
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wxStreamBuffer *buffer = NULL);
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virtual ~wxBufferedInputStream();
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char Peek();
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wxInputStream& Read(void *buffer, size_t size);
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// Position functions
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wxFileOffset SeekI(wxFileOffset pos, wxSeekMode mode = wxFromStart);
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wxFileOffset TellI() const;
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bool IsSeekable() const { return m_parent_i_stream->IsSeekable(); }
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// the buffer given to the stream will be deleted by it
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void SetInputStreamBuffer(wxStreamBuffer *buffer);
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wxStreamBuffer *GetInputStreamBuffer() const { return m_i_streambuf; }
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#if WXWIN_COMPATIBILITY_2_6
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// deprecated, for compatibility only
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wxDEPRECATED( wxStreamBuffer *InputStreamBuffer() const );
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#endif // WXWIN_COMPATIBILITY_2_6
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protected:
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virtual size_t OnSysRead(void *buffer, size_t bufsize);
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virtual wxFileOffset OnSysSeek(wxFileOffset seek, wxSeekMode mode);
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virtual wxFileOffset OnSysTell() const;
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wxStreamBuffer *m_i_streambuf;
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DECLARE_NO_COPY_CLASS(wxBufferedInputStream)
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};
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// ----------------------------------------------------------------------------
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// wxBufferedOutputStream
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// ----------------------------------------------------------------------------
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class WXDLLIMPEXP_BASE wxBufferedOutputStream : public wxFilterOutputStream
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{
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public:
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// if a non NULL buffer is given to the stream, it will be deleted by it
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wxBufferedOutputStream(wxOutputStream& stream,
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wxStreamBuffer *buffer = NULL);
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virtual ~wxBufferedOutputStream();
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wxOutputStream& Write(const void *buffer, size_t size);
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// Position functions
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wxFileOffset SeekO(wxFileOffset pos, wxSeekMode mode = wxFromStart);
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wxFileOffset TellO() const;
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bool IsSeekable() const { return m_parent_o_stream->IsSeekable(); }
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void Sync();
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bool Close();
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wxFileOffset GetLength() const;
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// the buffer given to the stream will be deleted by it
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void SetOutputStreamBuffer(wxStreamBuffer *buffer);
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wxStreamBuffer *GetOutputStreamBuffer() const { return m_o_streambuf; }
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#if WXWIN_COMPATIBILITY_2_6
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// deprecated, for compatibility only
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wxDEPRECATED( wxStreamBuffer *OutputStreamBuffer() const );
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#endif // WXWIN_COMPATIBILITY_2_6
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protected:
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virtual size_t OnSysWrite(const void *buffer, size_t bufsize);
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virtual wxFileOffset OnSysSeek(wxFileOffset seek, wxSeekMode mode);
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virtual wxFileOffset OnSysTell() const;
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wxStreamBuffer *m_o_streambuf;
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DECLARE_NO_COPY_CLASS(wxBufferedOutputStream)
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};
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#if WXWIN_COMPATIBILITY_2_6
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inline wxStreamBase *wxStreamBuffer::Stream() { return m_stream; }
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inline wxStreamBuffer *wxBufferedInputStream::InputStreamBuffer() const { return m_i_streambuf; }
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inline wxStreamBuffer *wxBufferedOutputStream::OutputStreamBuffer() const { return m_o_streambuf; }
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#endif // WXWIN_COMPATIBILITY_2_6
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#endif // wxUSE_STREAMS
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#endif // _WX_WXSTREAM_H__
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