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     wxZLIB_NO_HEADER = 1   // required for use in Gzip and Zip files
  35 };
  36
  37 class WXDLLIMPEXP_BASE wxZlibInputStream: public wxFilterInputStream {
  38  public:
  39   wxZlibInputStream(wxInputStream& stream, int flags = 0);
  40   virtual ~wxZlibInputStream();
  41
  42   char Peek() { return wxInputStream::Peek(); }
  43   size_t GetSize() const { return wxInputStream::GetSize(); }
  44
  45  protected:
  46   size_t OnSysRead(void *buffer, size_t size);
  47   off_t OnSysTell() const { return m_pos; }
  48
  49  protected:
  50   size_t m_z_size;
  51   unsigned char *m_z_buffer;
  52   struct z_stream_s *m_inflate;
  53   off_t m_pos;
  54
  55     DECLARE_NO_COPY_CLASS(wxZlibInputStream)
  56 };
  57
  58 class WXDLLIMPEXP_BASE wxZlibOutputStream: public wxFilterOutputStream {
  59  public:
  60   wxZlibOutputStream(wxOutputStream& stream, int level = -1, int flags = 0);
  61   virtual ~wxZlibOutputStream();
  62
  63   void Sync() { DoFlush(false); }
  64   size_t GetSize() const { return (size_t)m_pos; }
  65
  66  protected:
  67   size_t OnSysWrite(const void *buffer, size_t size);
  68   off_t OnSysTell() const { return m_pos; }
  69
  70   virtual void DoFlush(bool final);
  71
  72  protected:
  73   size_t m_z_size;
  74   unsigned char *m_z_buffer;
  75   struct z_stream_s *m_deflate;
  76   off_t m_pos;
  77
  78     DECLARE_NO_COPY_CLASS(wxZlibOutputStream)
  79 };
  80
  81 #endif
  82   // wxUSE_ZLIB && wxUSE_STREAMS
  83
  84 #endif
  85    // _WX_WXZSTREAM_H__
  86