dolphin/Externals/wxWidgets3/include/wx/stream.h

646 lines
21 KiB
C++

/////////////////////////////////////////////////////////////////////////////
// Name: wx/stream.h
// Purpose: stream classes
// Author: Guilhem Lavaux, Guillermo Rodriguez Garcia, Vadim Zeitlin
// Modified by:
// Created: 11/07/98
// RCS-ID: $Id: stream.h 59761 2009-03-23 10:59:40Z VZ $
// Copyright: (c) Guilhem Lavaux
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifndef _WX_WXSTREAM_H__
#define _WX_WXSTREAM_H__
#include "wx/defs.h"
#if wxUSE_STREAMS
#include <stdio.h>
#include "wx/object.h"
#include "wx/string.h"
#include "wx/filefn.h" // for wxFileOffset, wxInvalidOffset and wxSeekMode
class WXDLLIMPEXP_FWD_BASE wxStreamBase;
class WXDLLIMPEXP_FWD_BASE wxInputStream;
class WXDLLIMPEXP_FWD_BASE wxOutputStream;
typedef wxInputStream& (*__wxInputManip)(wxInputStream&);
typedef wxOutputStream& (*__wxOutputManip)(wxOutputStream&);
WXDLLIMPEXP_BASE wxOutputStream& wxEndL(wxOutputStream& o_stream);
// ----------------------------------------------------------------------------
// constants
// ----------------------------------------------------------------------------
enum wxStreamError
{
wxSTREAM_NO_ERROR = 0, // stream is in good state
wxSTREAM_EOF, // EOF reached in Read() or similar
wxSTREAM_WRITE_ERROR, // generic write error
wxSTREAM_READ_ERROR // generic read error
};
const int wxEOF = -1;
// ============================================================================
// base stream classes: wxInputStream and wxOutputStream
// ============================================================================
// ---------------------------------------------------------------------------
// wxStreamBase: common (but non virtual!) base for all stream classes
// ---------------------------------------------------------------------------
class WXDLLIMPEXP_BASE wxStreamBase : public wxObject
{
public:
wxStreamBase();
virtual ~wxStreamBase();
// error testing
wxStreamError GetLastError() const { return m_lasterror; }
virtual bool IsOk() const { return GetLastError() == wxSTREAM_NO_ERROR; }
bool operator!() const { return !IsOk(); }
// reset the stream state
void Reset() { m_lasterror = wxSTREAM_NO_ERROR; }
// this doesn't make sense for all streams, always test its return value
virtual size_t GetSize() const;
virtual wxFileOffset GetLength() const { return wxInvalidOffset; }
// returns true if the streams supports seeking to arbitrary offsets
virtual bool IsSeekable() const { return false; }
protected:
virtual wxFileOffset OnSysSeek(wxFileOffset seek, wxSeekMode mode);
virtual wxFileOffset OnSysTell() const;
size_t m_lastcount;
wxStreamError m_lasterror;
friend class wxStreamBuffer;
DECLARE_ABSTRACT_CLASS(wxStreamBase)
wxDECLARE_NO_COPY_CLASS(wxStreamBase);
};
// ----------------------------------------------------------------------------
// wxInputStream: base class for the input streams
// ----------------------------------------------------------------------------
class WXDLLIMPEXP_BASE wxInputStream : public wxStreamBase
{
public:
// ctor and dtor, nothing exciting
wxInputStream();
virtual ~wxInputStream();
// IO functions
// ------------
// return a character from the stream without removing it, i.e. it will
// still be returned by the next call to GetC()
//
// blocks until something appears in the stream if necessary, if nothing
// ever does (i.e. EOF) LastRead() will return 0 (and the return value is
// undefined), otherwise 1
virtual char Peek();
// return one byte from the stream, blocking until it appears if
// necessary
//
// on success returns a value between 0 - 255, or wxEOF on EOF or error.
int GetC();
// read at most the given number of bytes from the stream
//
// there are 2 possible situations here: either there is nothing at all in
// the stream right now in which case Read() blocks until something appears
// (use CanRead() to avoid this) or there is already some data available in
// the stream and then Read() doesn't block but returns just the data it
// can read without waiting for more
//
// in any case, if there are not enough bytes in the stream right now,
// LastRead() value will be less than size but greater than 0. If it is 0,
// it means that EOF has been reached.
virtual wxInputStream& Read(void *buffer, size_t size);
// copy the entire contents of this stream into streamOut, stopping only
// when EOF is reached or an error occurs
wxInputStream& Read(wxOutputStream& streamOut);
// status functions
// ----------------
// returns the number of bytes read by the last call to Read(), GetC() or
// Peek()
//
// this should be used to discover whether that call succeeded in reading
// all the requested data or not
virtual size_t LastRead() const { return wxStreamBase::m_lastcount; }
// returns true if some data is available in the stream right now, so that
// calling Read() wouldn't block
virtual bool CanRead() const;
// is the stream at EOF?
//
// note that this cannot be really implemented for all streams and
// CanRead() is more reliable than Eof()
virtual bool Eof() const;
// write back buffer
// -----------------
// put back the specified number of bytes into the stream, they will be
// fetched by the next call to the read functions
//
// returns the number of bytes really stuffed back
size_t Ungetch(const void *buffer, size_t size);
// put back the specified character in the stream
//
// returns true if ok, false on error
bool Ungetch(char c);
// position functions
// ------------------
// move the stream pointer to the given position (if the stream supports
// it)
//
// returns wxInvalidOffset on error
virtual wxFileOffset SeekI(wxFileOffset pos, wxSeekMode mode = wxFromStart);
// return the current position of the stream pointer or wxInvalidOffset
virtual wxFileOffset TellI() const;
// stream-like operators
// ---------------------
wxInputStream& operator>>(wxOutputStream& out) { return Read(out); }
wxInputStream& operator>>(__wxInputManip func) { return func(*this); }
protected:
// do read up to size bytes of data into the provided buffer
//
// this method should return 0 if EOF has been reached or an error occurred
// (m_lasterror should be set accordingly as well) or the number of bytes
// read
virtual size_t OnSysRead(void *buffer, size_t size) = 0;
// write-back buffer support
// -------------------------
// return the pointer to a buffer big enough to hold sizeNeeded bytes
char *AllocSpaceWBack(size_t sizeNeeded);
// read up to size data from the write back buffer, return the number of
// bytes read
size_t GetWBack(void *buf, size_t size);
// write back buffer or NULL if none
char *m_wback;
// the size of the buffer
size_t m_wbacksize;
// the current position in the buffer
size_t m_wbackcur;
friend class wxStreamBuffer;
DECLARE_ABSTRACT_CLASS(wxInputStream)
wxDECLARE_NO_COPY_CLASS(wxInputStream);
};
// ----------------------------------------------------------------------------
// wxOutputStream: base for the output streams
// ----------------------------------------------------------------------------
class WXDLLIMPEXP_BASE wxOutputStream : public wxStreamBase
{
public:
wxOutputStream();
virtual ~wxOutputStream();
void PutC(char c);
virtual wxOutputStream& Write(const void *buffer, size_t size);
wxOutputStream& Write(wxInputStream& stream_in);
virtual wxFileOffset SeekO(wxFileOffset pos, wxSeekMode mode = wxFromStart);
virtual wxFileOffset TellO() const;
virtual size_t LastWrite() const { return wxStreamBase::m_lastcount; }
virtual void Sync();
virtual bool Close() { return true; }
wxOutputStream& operator<<(wxInputStream& out) { return Write(out); }
wxOutputStream& operator<<( __wxOutputManip func) { return func(*this); }
protected:
// to be implemented in the derived classes (it should have been pure
// virtual)
virtual size_t OnSysWrite(const void *buffer, size_t bufsize);
friend class wxStreamBuffer;
DECLARE_ABSTRACT_CLASS(wxOutputStream)
wxDECLARE_NO_COPY_CLASS(wxOutputStream);
};
// ============================================================================
// helper stream classes
// ============================================================================
// ---------------------------------------------------------------------------
// A stream for measuring streamed output
// ---------------------------------------------------------------------------
class WXDLLIMPEXP_BASE wxCountingOutputStream : public wxOutputStream
{
public:
wxCountingOutputStream();
wxFileOffset GetLength() const;
bool Ok() const { return IsOk(); }
bool IsOk() const { return true; }
protected:
virtual size_t OnSysWrite(const void *buffer, size_t size);
virtual wxFileOffset OnSysSeek(wxFileOffset pos, wxSeekMode mode);
virtual wxFileOffset OnSysTell() const;
size_t m_currentPos;
DECLARE_DYNAMIC_CLASS(wxCountingOutputStream)
wxDECLARE_NO_COPY_CLASS(wxCountingOutputStream);
};
// ---------------------------------------------------------------------------
// "Filter" streams
// ---------------------------------------------------------------------------
class WXDLLIMPEXP_BASE wxFilterInputStream : public wxInputStream
{
public:
wxFilterInputStream();
wxFilterInputStream(wxInputStream& stream);
wxFilterInputStream(wxInputStream *stream);
virtual ~wxFilterInputStream();
char Peek() { return m_parent_i_stream->Peek(); }
wxFileOffset GetLength() const { return m_parent_i_stream->GetLength(); }
wxInputStream *GetFilterInputStream() const { return m_parent_i_stream; }
protected:
wxInputStream *m_parent_i_stream;
bool m_owns;
DECLARE_ABSTRACT_CLASS(wxFilterInputStream)
wxDECLARE_NO_COPY_CLASS(wxFilterInputStream);
};
class WXDLLIMPEXP_BASE wxFilterOutputStream : public wxOutputStream
{
public:
wxFilterOutputStream();
wxFilterOutputStream(wxOutputStream& stream);
wxFilterOutputStream(wxOutputStream *stream);
virtual ~wxFilterOutputStream();
wxFileOffset GetLength() const { return m_parent_o_stream->GetLength(); }
wxOutputStream *GetFilterOutputStream() const { return m_parent_o_stream; }
bool Close();
protected:
wxOutputStream *m_parent_o_stream;
bool m_owns;
DECLARE_ABSTRACT_CLASS(wxFilterOutputStream)
wxDECLARE_NO_COPY_CLASS(wxFilterOutputStream);
};
enum wxStreamProtocolType
{
wxSTREAM_PROTOCOL, // wxFileSystem protocol (should be only one)
wxSTREAM_MIMETYPE, // MIME types the stream handles
wxSTREAM_ENCODING, // The HTTP Content-Encodings the stream handles
wxSTREAM_FILEEXT // File extensions the stream handles
};
void WXDLLIMPEXP_BASE wxUseFilterClasses();
class WXDLLIMPEXP_BASE wxFilterClassFactoryBase : public wxObject
{
public:
virtual ~wxFilterClassFactoryBase() { }
wxString GetProtocol() const { return wxString(*GetProtocols()); }
wxString PopExtension(const wxString& location) const;
virtual const wxChar * const *GetProtocols(wxStreamProtocolType type
= wxSTREAM_PROTOCOL) const = 0;
bool CanHandle(const wxString& protocol,
wxStreamProtocolType type
= wxSTREAM_PROTOCOL) const;
protected:
wxString::size_type FindExtension(const wxString& location) const;
DECLARE_ABSTRACT_CLASS(wxFilterClassFactoryBase)
};
class WXDLLIMPEXP_BASE wxFilterClassFactory : public wxFilterClassFactoryBase
{
public:
virtual ~wxFilterClassFactory() { }
virtual wxFilterInputStream *NewStream(wxInputStream& stream) const = 0;
virtual wxFilterOutputStream *NewStream(wxOutputStream& stream) const = 0;
virtual wxFilterInputStream *NewStream(wxInputStream *stream) const = 0;
virtual wxFilterOutputStream *NewStream(wxOutputStream *stream) const = 0;
static const wxFilterClassFactory *Find(const wxString& protocol,
wxStreamProtocolType type
= wxSTREAM_PROTOCOL);
static const wxFilterClassFactory *GetFirst();
const wxFilterClassFactory *GetNext() const { return m_next; }
void PushFront() { Remove(); m_next = sm_first; sm_first = this; }
void Remove();
protected:
wxFilterClassFactory() : m_next(this) { }
wxFilterClassFactory& operator=(const wxFilterClassFactory&)
{ return *this; }
private:
static wxFilterClassFactory *sm_first;
wxFilterClassFactory *m_next;
DECLARE_ABSTRACT_CLASS(wxFilterClassFactory)
};
// ============================================================================
// buffered streams
// ============================================================================
// ---------------------------------------------------------------------------
// Stream buffer: this class can be derived from and passed to
// wxBufferedStreams to implement custom buffering
// ---------------------------------------------------------------------------
class WXDLLIMPEXP_BASE wxStreamBuffer
{
public:
enum BufMode
{
read,
write,
read_write
};
wxStreamBuffer(wxStreamBase& stream, BufMode mode)
{
InitWithStream(stream, mode);
}
wxStreamBuffer(size_t bufsize, wxInputStream& stream)
{
InitWithStream(stream, read);
SetBufferIO(bufsize);
}
wxStreamBuffer(size_t bufsize, wxOutputStream& stream)
{
InitWithStream(stream, write);
SetBufferIO(bufsize);
}
wxStreamBuffer(const wxStreamBuffer& buf);
virtual ~wxStreamBuffer();
// Filtered IO
virtual size_t Read(void *buffer, size_t size);
size_t Read(wxStreamBuffer *buf);
virtual size_t Write(const void *buffer, size_t size);
size_t Write(wxStreamBuffer *buf);
virtual char Peek();
virtual char GetChar();
virtual void PutChar(char c);
virtual wxFileOffset Tell() const;
virtual wxFileOffset Seek(wxFileOffset pos, wxSeekMode mode);
// Buffer control
void ResetBuffer();
void Truncate();
// NB: the buffer must always be allocated with malloc() if takeOwn is
// true as it will be deallocated by free()
void SetBufferIO(void *start, void *end, bool takeOwnership = false);
void SetBufferIO(void *start, size_t len, bool takeOwnership = false);
void SetBufferIO(size_t bufsize);
void *GetBufferStart() const { return m_buffer_start; }
void *GetBufferEnd() const { return m_buffer_end; }
void *GetBufferPos() const { return m_buffer_pos; }
size_t GetBufferSize() const { return m_buffer_end - m_buffer_start; }
size_t GetIntPosition() const { return m_buffer_pos - m_buffer_start; }
void SetIntPosition(size_t pos) { m_buffer_pos = m_buffer_start + pos; }
size_t GetLastAccess() const { return m_buffer_end - m_buffer_start; }
size_t GetBytesLeft() const { return m_buffer_end - m_buffer_pos; }
void Fixed(bool fixed) { m_fixed = fixed; }
void Flushable(bool f) { m_flushable = f; }
bool FlushBuffer();
bool FillBuffer();
size_t GetDataLeft();
// misc accessors
wxStreamBase *GetStream() const { return m_stream; }
bool HasBuffer() const { return m_buffer_start != m_buffer_end; }
bool IsFixed() const { return m_fixed; }
bool IsFlushable() const { return m_flushable; }
// only for input/output buffers respectively, returns NULL otherwise
wxInputStream *GetInputStream() const;
wxOutputStream *GetOutputStream() const;
#if WXWIN_COMPATIBILITY_2_6
// deprecated, for compatibility only
wxDEPRECATED( wxStreamBase *Stream() );
#endif // WXWIN_COMPATIBILITY_2_6
// this constructs a dummy wxStreamBuffer, used by (and exists for)
// wxMemoryStreams only, don't use!
wxStreamBuffer(BufMode mode);
protected:
void GetFromBuffer(void *buffer, size_t size);
void PutToBuffer(const void *buffer, size_t size);
// set the last error to the specified value if we didn't have it before
void SetError(wxStreamError err);
// common part of several ctors
void Init();
// common part of ctors taking wxStreamBase parameter
void InitWithStream(wxStreamBase& stream, BufMode mode);
// init buffer variables to be empty
void InitBuffer();
// free the buffer (always safe to call)
void FreeBuffer();
// the buffer itself: the pointers to its start and end and the current
// position in the buffer
char *m_buffer_start,
*m_buffer_end,
*m_buffer_pos;
// the stream we're associated with
wxStreamBase *m_stream;
// its mode
BufMode m_mode;
// flags
bool m_destroybuf, // deallocate buffer?
m_fixed,
m_flushable;
wxDECLARE_NO_ASSIGN_CLASS(wxStreamBuffer);
};
// ---------------------------------------------------------------------------
// wxBufferedInputStream
// ---------------------------------------------------------------------------
class WXDLLIMPEXP_BASE wxBufferedInputStream : public wxFilterInputStream
{
public:
// create a buffered stream on top of the specified low-level stream
//
// if a non NULL buffer is given to the stream, it will be deleted by it,
// otherwise a default 1KB buffer will be used
wxBufferedInputStream(wxInputStream& stream,
wxStreamBuffer *buffer = NULL);
// ctor allowing to specify the buffer size, it's just a more convenient
// alternative to creating wxStreamBuffer, calling its SetBufferIO(bufsize)
// and using the ctor above
wxBufferedInputStream(wxInputStream& stream, size_t bufsize);
virtual ~wxBufferedInputStream();
char Peek();
wxInputStream& Read(void *buffer, size_t size);
// Position functions
wxFileOffset SeekI(wxFileOffset pos, wxSeekMode mode = wxFromStart);
wxFileOffset TellI() const;
bool IsSeekable() const { return m_parent_i_stream->IsSeekable(); }
// the buffer given to the stream will be deleted by it
void SetInputStreamBuffer(wxStreamBuffer *buffer);
wxStreamBuffer *GetInputStreamBuffer() const { return m_i_streambuf; }
#if WXWIN_COMPATIBILITY_2_6
// deprecated, for compatibility only
wxDEPRECATED( wxStreamBuffer *InputStreamBuffer() const );
#endif // WXWIN_COMPATIBILITY_2_6
protected:
virtual size_t OnSysRead(void *buffer, size_t bufsize);
virtual wxFileOffset OnSysSeek(wxFileOffset seek, wxSeekMode mode);
virtual wxFileOffset OnSysTell() const;
wxStreamBuffer *m_i_streambuf;
wxDECLARE_NO_COPY_CLASS(wxBufferedInputStream);
};
// ----------------------------------------------------------------------------
// wxBufferedOutputStream
// ----------------------------------------------------------------------------
class WXDLLIMPEXP_BASE wxBufferedOutputStream : public wxFilterOutputStream
{
public:
// create a buffered stream on top of the specified low-level stream
//
// if a non NULL buffer is given to the stream, it will be deleted by it,
// otherwise a default 1KB buffer will be used
wxBufferedOutputStream(wxOutputStream& stream,
wxStreamBuffer *buffer = NULL);
// ctor allowing to specify the buffer size, it's just a more convenient
// alternative to creating wxStreamBuffer, calling its SetBufferIO(bufsize)
// and using the ctor above
wxBufferedOutputStream(wxOutputStream& stream, size_t bufsize);
virtual ~wxBufferedOutputStream();
wxOutputStream& Write(const void *buffer, size_t size);
// Position functions
wxFileOffset SeekO(wxFileOffset pos, wxSeekMode mode = wxFromStart);
wxFileOffset TellO() const;
bool IsSeekable() const { return m_parent_o_stream->IsSeekable(); }
void Sync();
bool Close();
wxFileOffset GetLength() const;
// the buffer given to the stream will be deleted by it
void SetOutputStreamBuffer(wxStreamBuffer *buffer);
wxStreamBuffer *GetOutputStreamBuffer() const { return m_o_streambuf; }
#if WXWIN_COMPATIBILITY_2_6
// deprecated, for compatibility only
wxDEPRECATED( wxStreamBuffer *OutputStreamBuffer() const );
#endif // WXWIN_COMPATIBILITY_2_6
protected:
virtual size_t OnSysWrite(const void *buffer, size_t bufsize);
virtual wxFileOffset OnSysSeek(wxFileOffset seek, wxSeekMode mode);
virtual wxFileOffset OnSysTell() const;
wxStreamBuffer *m_o_streambuf;
wxDECLARE_NO_COPY_CLASS(wxBufferedOutputStream);
};
#if WXWIN_COMPATIBILITY_2_6
inline wxStreamBase *wxStreamBuffer::Stream() { return m_stream; }
inline wxStreamBuffer *wxBufferedInputStream::InputStreamBuffer() const { return m_i_streambuf; }
inline wxStreamBuffer *wxBufferedOutputStream::OutputStreamBuffer() const { return m_o_streambuf; }
#endif // WXWIN_COMPATIBILITY_2_6
#endif // wxUSE_STREAMS
#endif // _WX_WXSTREAM_H__