source: abuse/tags/pd/macabuse/inc/ramfile.hpp @ 49

Last change on this file since 49 was 49, checked in by Sam Hocevar, 12 years ago
  • Imported original public domain release, for future reference.
File size: 1.4 KB
Line 
1#ifndef MEMORY_FILE
2#define MEMORY_FILE
3
4#include "jmalloc.hpp"
5#include "system.h"
6
7class memory_file
8{
9  unsigned char *data;
10
11  public :
12  long wp,rp,size;
13
14  memory_file(int size) : size(size)
15  //{{
16  {
17    data=(unsigned char *)jmalloc(size,"memory file");
18    wp=rp=0;
19  }
20  //}}
21
22  ~memory_file()
23  //{{
24  {
25    jfree(data);
26  }
27  //}}
28
29  void write_short(unsigned short x)
30  //{{{
31  {
32    x=int_to_local(x);
33    write(&x,2);
34  }
35  //}}
36
37  void write_long(unsigned long x)
38  //{{{
39  {
40    x=long_to_local(x);
41    write(&x,4);
42  }
43  //}}}
44
45  unsigned short read_short()
46  //{{{
47  {
48    unsigned short x;
49    read(&x,2);
50    return int_to_local(x);
51  }
52  //}}}
53
54  unsigned long read_long()
55  //{{{
56  {
57    unsigned long x;
58    read(&x,4);
59    return long_to_local(x);
60  }
61  //}}
62
63  long read(void *buf, int rsize)
64  //{{{
65  {
66    if (rp+rsize>wp)
67      rsize=wp-rp;
68    memcpy(buf,data+rp,rsize);
69    rp+=rsize;
70    return rsize;
71  }
72  //}}
73
74  long write(void *buf, int wsize)
75  //{{
76  {
77    if (wp+wsize>size)
78      wsize=size-wp;
79    memcpy(data+wp,buf,wsize);
80    wp+=wsize;
81    return wsize;
82  }
83  //}}
84
85  void write_byte(unsigned char c)
86  //{{{
87  {
88    if (wp+1<=size)
89      data[wp++]=c;
90  }
91  //}}
92
93  unsigned char read_byte()
94  //{{
95  {
96    if (rp+1<=wp)
97      return data[rp++];
98     return 0;
99  }
100  //}}
101
102} ;
103
104
105#endif
106//{{{ Emacs Locals
107// Local Variables:
108// folded-file: t
109// End:
110//}}}
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