wxWidgets/include/wx/zstream.h

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/////////////////////////////////////////////////////////////////////////////
// Name: zstream.h
// Purpose: Memory stream classes
// Author: Guilhem Lavaux
// Modified by: Mike Wetherell
// Created: 11/07/98
// RCS-ID: $Id$
// Copyright: (c) Guilhem Lavaux
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifndef _WX_WXZSTREAM_H__
#define _WX_WXZSTREAM_H__
#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
#pragma interface "zstream.h"
#endif
#include "wx/defs.h"
#if wxUSE_ZLIB && wxUSE_STREAMS
#include "wx/stream.h"
// Compression level
enum {
wxZ_DEFAULT_COMPRESSION = -1,
wxZ_NO_COMPRESSION = 0,
wxZ_BEST_SPEED = 1,
wxZ_BEST_COMPRESSION = 9
};
// Flags
enum {
#if WXWIN_COMPATIBILITY_2_4
wxZLIB_24COMPATIBLE = 4, // read v2.4.x data without error
#endif
wxZLIB_NO_HEADER = 0, // raw deflate stream, no header or checksum
wxZLIB_ZLIB = 1, // zlib header and checksum
wxZLIB_GZIP = 2, // gzip header and checksum, requires zlib 1.2.1+
wxZLIB_AUTO = 3 // autodetect header zlib or gzip
};
class WXDLLIMPEXP_BASE wxZlibInputStream: public wxFilterInputStream {
public:
wxZlibInputStream(wxInputStream& stream, int flags = wxZLIB_AUTO);
virtual ~wxZlibInputStream();
char Peek() { return wxInputStream::Peek(); }
size_t GetSize() const { return wxInputStream::GetSize(); }
static bool CanHandleGZip();
protected:
size_t OnSysRead(void *buffer, size_t size);
off_t OnSysTell() const { return m_pos; }
protected:
size_t m_z_size;
unsigned char *m_z_buffer;
struct z_stream_s *m_inflate;
off_t m_pos;
#if WXWIN_COMPATIBILITY_2_4
bool m_24compatibilty;
#endif
DECLARE_NO_COPY_CLASS(wxZlibInputStream)
};
class WXDLLIMPEXP_BASE wxZlibOutputStream: public wxFilterOutputStream {
public:
wxZlibOutputStream(wxOutputStream& stream, int level = -1, int flags = wxZLIB_ZLIB);
virtual ~wxZlibOutputStream();
void Sync() { DoFlush(false); }
size_t GetSize() const { return (size_t)m_pos; }
static bool CanHandleGZip();
protected:
size_t OnSysWrite(const void *buffer, size_t size);
off_t OnSysTell() const { return m_pos; }
virtual void DoFlush(bool final);
protected:
size_t m_z_size;
unsigned char *m_z_buffer;
struct z_stream_s *m_deflate;
off_t m_pos;
DECLARE_NO_COPY_CLASS(wxZlibOutputStream)
};
#endif
// wxUSE_ZLIB && wxUSE_STREAMS
#endif
// _WX_WXZSTREAM_H__