source: golgotha/src/i4/file/ram_file.hh @ 80

Last change on this file since 80 was 80, checked in by Sam Hocevar, 12 years ago
  • Adding the Golgotha source code. Not sure what's going to be interesting in there, but since it's all public domain, there's certainly stuff to pick up.
File size: 1.5 KB
Line 
1/********************************************************************** <BR>
2  This file is part of Crack dot Com's free source code release of
3  Golgotha. <a href="http://www.crack.com/golgotha_release"> <BR> for
4  information about compiling & licensing issues visit this URL</a>
5  <PRE> If that doesn't help, contact Jonathan Clark at
6  golgotha_source@usa.net (Subject should have "GOLG" in it)
7***********************************************************************/
8
9#ifndef I4_RAM_FILE_HH
10#define I4_RAM_FILE_HH
11
12#include "file/file.hh"
13#include <memory.h>
14
15class i4_ram_file_class : public i4_file_class
16{
17  w8 *buf;
18  w32 bs, offset;
19
20public:
21  virtual i4_file_class *dup()
22  {
23    i4_file_class *f=new i4_ram_file_class(buf, bs);
24    f->seek(tell());
25    return f;
26  }
27
28  i4_ram_file_class(void *buffer, int buffer_size)
29    : buf((w8 *)buffer), bs(buffer_size), offset(0) { ; }
30 
31  virtual w32 read (void *buffer, w32 size)
32  {
33    if (size>bs-offset)
34      size=bs-offset;
35    memcpy(buffer, buf+offset, size);
36    offset+=size;
37    return size;
38  }
39   
40  virtual w32 write(const void *buffer, w32 size)
41  {
42    if (size>bs-offset)
43      size=bs-offset;
44    memcpy(buf+offset, buffer, size);
45    offset+=size;
46    return size;
47  }
48
49  virtual w32 seek (w32 _offset) { offset=_offset; return offset; }
50  virtual w32 size ()            { return bs;      }
51  virtual w32 tell ()            { return offset;  }
52};
53
54
55#endif
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