// Author: Guilhem Lavaux, Guillermo Rodriguez Garcia, Vadim Zeitlin
// Modified by:
// Created: 11/07/98
-// RCS-ID: $Id$
// Copyright: (c) Guilhem Lavaux
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#include "wx/string.h"
#include "wx/filefn.h" // for wxFileOffset, wxInvalidOffset and wxSeekMode
-class WXDLLIMPEXP_BASE wxStreamBase;
-class WXDLLIMPEXP_BASE wxInputStream;
-class WXDLLIMPEXP_BASE wxOutputStream;
+class WXDLLIMPEXP_FWD_BASE wxStreamBase;
+class WXDLLIMPEXP_FWD_BASE wxInputStream;
+class WXDLLIMPEXP_FWD_BASE wxOutputStream;
typedef wxInputStream& (*__wxInputManip)(wxInputStream&);
typedef wxOutputStream& (*__wxOutputManip)(wxOutputStream&);
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
+class WXDLLIMPEXP_BASE wxStreamBase : public wxObject
{
public:
wxStreamBase();
// error testing
wxStreamError GetLastError() const { return m_lasterror; }
- bool IsOk() const { return GetLastError() == wxSTREAM_NO_ERROR; }
+ 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; }
+ void Reset(wxStreamError error = wxSTREAM_NO_ERROR) { m_lasterror = error; }
// this doesn't make sense for all streams, always test its return value
virtual size_t GetSize() const;
friend class wxStreamBuffer;
- DECLARE_NO_COPY_CLASS(wxStreamBase)
+ DECLARE_ABSTRACT_CLASS(wxStreamBase)
+ wxDECLARE_NO_COPY_CLASS(wxStreamBase);
};
// ----------------------------------------------------------------------------
// undefined), otherwise 1
virtual char Peek();
- // return one character from the stream, blocking until it appears if
+ // return one byte from the stream, blocking until it appears if
// necessary
//
- // if EOF, return value is undefined and LastRead() will return 0 and not 1
- char GetC();
+ // 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
//
// it means that EOF has been reached.
virtual wxInputStream& Read(void *buffer, size_t size);
+ // Read exactly the given number of bytes, unlike Read(), which may read
+ // less than the requested amount of data without returning an error, this
+ // method either reads all the data or returns false.
+ bool ReadAll(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);
friend class wxStreamBuffer;
- DECLARE_NO_COPY_CLASS(wxInputStream)
+ DECLARE_ABSTRACT_CLASS(wxInputStream)
+ wxDECLARE_NO_COPY_CLASS(wxInputStream);
};
// ----------------------------------------------------------------------------
void PutC(char c);
virtual wxOutputStream& Write(const void *buffer, size_t size);
+
+ // This is ReadAll() equivalent for Write(): it either writes exactly the
+ // given number of bytes or returns false, unlike Write() which can write
+ // less data than requested but still return without error.
+ bool WriteAll(const void *buffer, size_t size);
+
wxOutputStream& Write(wxInputStream& stream_in);
virtual wxFileOffset SeekO(wxFileOffset pos, wxSeekMode mode = wxFromStart);
friend class wxStreamBuffer;
- DECLARE_NO_COPY_CLASS(wxOutputStream)
+ DECLARE_ABSTRACT_CLASS(wxOutputStream)
+ wxDECLARE_NO_COPY_CLASS(wxOutputStream);
};
// ============================================================================
public:
wxCountingOutputStream();
- wxFileOffset GetLength() const;
+ virtual wxFileOffset GetLength() const;
bool Ok() const { return IsOk(); }
- bool IsOk() const { return true; }
+ virtual 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;
+ size_t m_currentPos,
+ m_lastPos;
- DECLARE_NO_COPY_CLASS(wxCountingOutputStream)
+ DECLARE_DYNAMIC_CLASS(wxCountingOutputStream)
+ wxDECLARE_NO_COPY_CLASS(wxCountingOutputStream);
};
// ---------------------------------------------------------------------------
public:
wxFilterInputStream();
wxFilterInputStream(wxInputStream& stream);
+ wxFilterInputStream(wxInputStream *stream);
virtual ~wxFilterInputStream();
char Peek() { return m_parent_i_stream->Peek(); }
protected:
wxInputStream *m_parent_i_stream;
+ bool m_owns;
- DECLARE_NO_COPY_CLASS(wxFilterInputStream)
+ 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;
- DECLARE_NO_COPY_CLASS(wxFilterOutputStream)
+ 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)
};
// ============================================================================
read_write
};
- wxStreamBuffer(wxStreamBase& stream, BufMode mode);
+ 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();
// 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 *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_size; }
+ 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; }
// misc accessors
wxStreamBase *GetStream() const { return m_stream; }
- bool HasBuffer() const { return m_buffer_size != 0; }
+ bool HasBuffer() const { return m_buffer_start != m_buffer_end; }
bool IsFixed() const { return m_fixed; }
bool IsFlushable() const { return m_flushable; }
// 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();
*m_buffer_end,
*m_buffer_pos;
- // the buffer size
- // FIXME: isn't it the same as m_buffer_end - m_buffer_start? (VZ)
- size_t m_buffer_size;
-
// the stream we're associated with
wxStreamBase *m_stream;
m_fixed,
m_flushable;
-private:
-// Cannot use
-// DECLARE_NO_COPY_CLASS(wxStreamBuffer)
-// because copy constructor is explicitly declared above;
-// but no copy assignment operator is defined, so declare
-// it private to prevent the compiler from defining it:
- wxStreamBuffer& operator=(const wxStreamBuffer&);
+
+ wxDECLARE_NO_ASSIGN_CLASS(wxStreamBuffer);
};
// ---------------------------------------------------------------------------
class WXDLLIMPEXP_BASE wxBufferedInputStream : public wxFilterInputStream
{
public:
- // if a non NULL buffer is given to the stream, it will be deleted by it
+ // 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();
wxStreamBuffer *m_i_streambuf;
- DECLARE_NO_COPY_CLASS(wxBufferedInputStream)
+ wxDECLARE_NO_COPY_CLASS(wxBufferedInputStream);
};
// ----------------------------------------------------------------------------
class WXDLLIMPEXP_BASE wxBufferedOutputStream : public wxFilterOutputStream
{
public:
- // if a non NULL buffer is given to the stream, it will be deleted by it
+ // 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);
wxStreamBuffer *m_o_streambuf;
- DECLARE_NO_COPY_CLASS(wxBufferedOutputStream)
+ wxDECLARE_NO_COPY_CLASS(wxBufferedOutputStream);
};
#if WXWIN_COMPATIBILITY_2_6
inline wxStreamBuffer *wxBufferedOutputStream::OutputStreamBuffer() const { return m_o_streambuf; }
#endif // WXWIN_COMPATIBILITY_2_6
+// ---------------------------------------------------------------------------
+// wxWrapperInputStream: forwards all IO to another stream.
+// ---------------------------------------------------------------------------
+
+class WXDLLIMPEXP_BASE wxWrapperInputStream : public wxFilterInputStream
+{
+public:
+ // Constructor fully initializing the stream. The overload taking pointer
+ // takes ownership of the parent stream, the one taking reference does not.
+ //
+ // Notice that this class also has a default ctor but it's protected as the
+ // derived class is supposed to take care of calling InitParentStream() if
+ // it's used.
+ wxWrapperInputStream(wxInputStream& stream);
+ wxWrapperInputStream(wxInputStream* stream);
+
+ // Override the base class methods to forward to the wrapped stream.
+ virtual wxFileOffset GetLength() const;
+ virtual bool IsSeekable() const;
+
+protected:
+ virtual size_t OnSysRead(void *buffer, size_t size);
+ virtual wxFileOffset OnSysSeek(wxFileOffset pos, wxSeekMode mode);
+ virtual wxFileOffset OnSysTell() const;
+
+ // Ensure that our own last error is the same as that of the real stream.
+ //
+ // This method is const because the error must be updated even from const
+ // methods (in other words, it really should have been mutable in the first
+ // place).
+ void SynchronizeLastError() const
+ {
+ const_cast<wxWrapperInputStream*>(this)->
+ Reset(m_parent_i_stream->GetLastError());
+ }
+
+ // Default constructor, use InitParentStream() later.
+ wxWrapperInputStream();
+
+ // Set up the wrapped stream for an object initialized using the default
+ // constructor. The ownership logic is the same as above.
+ void InitParentStream(wxInputStream& stream);
+ void InitParentStream(wxInputStream* stream);
+
+ wxDECLARE_NO_COPY_CLASS(wxWrapperInputStream);
+};
+
+
#endif // wxUSE_STREAMS
#endif // _WX_WXSTREAM_H__
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