blob: 3208efbf2274285ad19a23b2a091984d956832c3 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
|
// TODO: remove all the allocations from this class
class ring_buffer
{
public:
struct item
{
item *next;
item *prev;
int size;
unsigned char *data() { return (unsigned char *)(this+1); }
};
item *first_item;
item *last_item;
unsigned buffer_size;
ring_buffer()
{
first_item = 0;
last_item = 0;
buffer_size = 0;
}
~ring_buffer()
{
reset();
}
void reset()
{
// clear all
while(first())
pop_first();
}
void *alloc(int size)
{
item *i = (item*)mem_alloc(sizeof(item)+size, 1);
i->size = size;
i->prev = last_item;
i->next = 0;
if(last_item)
last_item->next = i;
else
first_item = i;
last_item = i;
buffer_size += size;
return i->data();
}
item *first()
{
return first_item;
}
/*
void *peek_data()
{
if(!first)
return 0;
return (void*)(first+1);
}*/
void pop_first()
{
if(first_item)
{
item *next = first_item->next;
buffer_size -= first_item->size;
mem_free(first_item);
first_item = next;
if(first_item)
first_item->prev = 0;
else
last_item = 0;
}
}
unsigned size() { return buffer_size; }
};
|