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/////////////////////////////////////////////////////////////////////////////
// Name: wx/zstream.h
// Purpose: Memory stream classes
// Author: Guilhem Lavaux
// Modified by: Mike Wetherell
// Created: 11/07/98
// Copyright: (c) Guilhem Lavaux
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifndef _WX_WXZSTREAM_H__
#define _WX_WXZSTREAM_H__
#include "wx/defs.h"
#if wxUSE_ZLIB && wxUSE_STREAMS
#include "wx/stream.h"
#include "wx/versioninfo.h"
// Compression level
enum wxZlibCompressionLevels {
wxZ_DEFAULT_COMPRESSION = -1,
wxZ_NO_COMPRESSION = 0,
wxZ_BEST_SPEED = 1,
wxZ_BEST_COMPRESSION = 9
};
// Flags
enum wxZLibFlags {
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);
wxZlibInputStream(wxInputStream *stream, int flags = wxZLIB_AUTO);
virtual ~wxZlibInputStream();
char Peek() wxOVERRIDE { return wxInputStream::Peek(); }
wxFileOffset GetLength() const wxOVERRIDE { return wxInputStream::GetLength(); }
static bool CanHandleGZip();
bool SetDictionary(const char *data, size_t datalen);
bool SetDictionary(const wxMemoryBuffer &buf);
protected:
size_t OnSysRead(void *buffer, size_t size) wxOVERRIDE;
wxFileOffset OnSysTell() const wxOVERRIDE { return m_pos; }
private:
void Init(int flags);
protected:
size_t m_z_size;
unsigned char *m_z_buffer;
struct z_stream_s *m_inflate;
wxFileOffset m_pos;
wxDECLARE_NO_COPY_CLASS(wxZlibInputStream);
};
class WXDLLIMPEXP_BASE wxZlibOutputStream: public wxFilterOutputStream {
public:
wxZlibOutputStream(wxOutputStream& stream, int level = -1, int flags = wxZLIB_ZLIB);
wxZlibOutputStream(wxOutputStream *stream, int level = -1, int flags = wxZLIB_ZLIB);
virtual ~wxZlibOutputStream() { Close(); }
void Sync() wxOVERRIDE { DoFlush(false); }
bool Close() wxOVERRIDE;
wxFileOffset GetLength() const wxOVERRIDE { return m_pos; }
static bool CanHandleGZip();
bool SetDictionary(const char *data, size_t datalen);
bool SetDictionary(const wxMemoryBuffer &buf);
protected:
size_t OnSysWrite(const void *buffer, size_t size) wxOVERRIDE;
wxFileOffset OnSysTell() const wxOVERRIDE { return m_pos; }
virtual void DoFlush(bool final);
private:
void Init(int level, int flags);
protected:
size_t m_z_size;
unsigned char *m_z_buffer;
struct z_stream_s *m_deflate;
wxFileOffset m_pos;
wxDECLARE_NO_COPY_CLASS(wxZlibOutputStream);
};
class WXDLLIMPEXP_BASE wxZlibClassFactory: public wxFilterClassFactory
{
public:
wxZlibClassFactory();
wxFilterInputStream *NewStream(wxInputStream& stream) const wxOVERRIDE
{ return new wxZlibInputStream(stream); }
wxFilterOutputStream *NewStream(wxOutputStream& stream) const wxOVERRIDE
{ return new wxZlibOutputStream(stream, -1); }
wxFilterInputStream *NewStream(wxInputStream *stream) const wxOVERRIDE
{ return new wxZlibInputStream(stream); }
wxFilterOutputStream *NewStream(wxOutputStream *stream) const wxOVERRIDE
{ return new wxZlibOutputStream(stream, -1); }
const wxChar * const *GetProtocols(wxStreamProtocolType type
= wxSTREAM_PROTOCOL) const wxOVERRIDE;
private:
wxDECLARE_DYNAMIC_CLASS(wxZlibClassFactory);
};
class WXDLLIMPEXP_BASE wxGzipClassFactory: public wxFilterClassFactory
{
public:
wxGzipClassFactory();
wxFilterInputStream *NewStream(wxInputStream& stream) const wxOVERRIDE
{ return new wxZlibInputStream(stream); }
wxFilterOutputStream *NewStream(wxOutputStream& stream) const wxOVERRIDE
{ return new wxZlibOutputStream(stream, -1); }
wxFilterInputStream *NewStream(wxInputStream *stream) const wxOVERRIDE
{ return new wxZlibInputStream(stream); }
wxFilterOutputStream *NewStream(wxOutputStream *stream) const wxOVERRIDE
{ return new wxZlibOutputStream(stream, -1); }
const wxChar * const *GetProtocols(wxStreamProtocolType type
= wxSTREAM_PROTOCOL) const wxOVERRIDE;
private:
wxDECLARE_DYNAMIC_CLASS(wxGzipClassFactory);
};
WXDLLIMPEXP_BASE wxVersionInfo wxGetZlibVersionInfo();
#endif
// wxUSE_ZLIB && wxUSE_STREAMS
#endif
// _WX_WXZSTREAM_H__
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