include/wx/zstream.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        zstream.h
   3 // Purpose:     Memory stream classes
   4 // Author:      Guilhem Lavaux
   5 // Modified by: Mike Wetherell
   6 // Created:     11/07/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Guilhem Lavaux
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11 #ifndef _WX_WXZSTREAM_H__
  12 #define _WX_WXZSTREAM_H__
  13
  14 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  15 #pragma interface "zstream.h"
  16 #endif
  17
  18 #include "wx/defs.h"
  19
  20 #if wxUSE_ZLIB && wxUSE_STREAMS
  21
  22 #include "wx/stream.h"
  23
  24 // Compression level
  25 enum {
  26     wxZ_DEFAULT_COMPRESSION = -1,
  27     wxZ_NO_COMPRESSION = 0,
  28     wxZ_BEST_SPEED = 1,
  29     wxZ_BEST_COMPRESSION = 9
  30 };
  31
  32 // Flags
  33 enum {
  34 #if WXWIN_COMPATIBILITY_2_4
  35     wxZLIB_24COMPATIBLE = 4, // read v2.4.x data without error
  36 #endif
  37     wxZLIB_NO_HEADER = 0,    // raw deflate stream, no header or checksum
  38     wxZLIB_ZLIB = 1,         // zlib header and checksum
  39     wxZLIB_GZIP = 2,         // gzip header and checksum, requires zlib 1.2.1+
  40     wxZLIB_AUTO = 3          // autodetect header zlib or gzip
  41 };
  42
  43 class WXDLLIMPEXP_BASE wxZlibInputStream: public wxFilterInputStream {
  44  public:
  45   wxZlibInputStream(wxInputStream& stream, int flags = wxZLIB_AUTO);
  46   virtual ~wxZlibInputStream();
  47
  48   char Peek() { return wxInputStream::Peek(); }
  49   wxFileOffset GetLength() const { return wxInputStream::GetLength(); }
  50
  51   static bool CanHandleGZip();
  52
  53  protected:
  54   size_t OnSysRead(void *buffer, size_t size);
  55   wxFileOffset OnSysTell() const { return m_pos; }
  56
  57  protected:
  58   size_t m_z_size;
  59   unsigned char *m_z_buffer;
  60   struct z_stream_s *m_inflate;
  61   wxFileOffset m_pos;
  62 #if WXWIN_COMPATIBILITY_2_4
  63   bool m_24compatibilty;
  64 #endif
  65
  66   DECLARE_NO_COPY_CLASS(wxZlibInputStream)
  67 };
  68
  69 class WXDLLIMPEXP_BASE wxZlibOutputStream: public wxFilterOutputStream {
  70  public:
  71   wxZlibOutputStream(wxOutputStream& stream, int level = -1, int flags = wxZLIB_ZLIB);
  72   virtual ~wxZlibOutputStream();
  73
  74   void Sync() { DoFlush(false); }
  75   wxFileOffset GetLength() const { return m_pos; }
  76
  77   static bool CanHandleGZip();
  78
  79  protected:
  80   size_t OnSysWrite(const void *buffer, size_t size);
  81   wxFileOffset OnSysTell() const { return m_pos; }
  82
  83   virtual void DoFlush(bool final);
  84
  85  protected:
  86   size_t m_z_size;
  87   unsigned char *m_z_buffer;
  88   struct z_stream_s *m_deflate;
  89   wxFileOffset m_pos;
  90
  91   DECLARE_NO_COPY_CLASS(wxZlibOutputStream)
  92 };
  93
  94 #endif
  95   // wxUSE_ZLIB && wxUSE_STREAMS
  96
  97 #endif
  98    // _WX_WXZSTREAM_H__
  99