server/server/dynbuf.C

#define __STDC_CONSTANT_MACROS
#include <stdint.h>

#ifndef UINT64_C
# error missing c99 support, define UINT64_C yourself
# define UINT64_C(c) c ## LL
#endif

#include "global.h"

#include <cstdio>

dynbuf::dynbuf (int initial, int extend)
{
  _size = 0;
  ext   = extend;
  first = last = (chunk *)new char [sizeof (chunk) + initial];
  first->next = 0;
  room  = initial;
  ptr   = first->data;
}

dynbuf::~dynbuf ()
{
  clear ();
}

void dynbuf::clear ()
{
  while (first)
    {
      chunk *next = first->next;
      delete [] (char *)first;
      first = next;
    }
} 

void dynbuf::finish ()
{
  // finalise current chunk
  _size += last->size = ptr - last->data;
}

void dynbuf::_reserve (int size)
{
  finish ();

  do
    {
      ext += ext >> 1;
      ext = (ext + 15) & ~15;
    }
  while (ext < size);

  chunk *add = (chunk *)new char [sizeof (chunk) + ext];
  add->next = 0;

  last->next = add;
  last = add;

  room = ext;
  ptr  = last->data;
}

void dynbuf::linearise (void *data)
{
  char *p = (char *)data;

  last->size = ptr - last->data;

  for (chunk *c = first; c; c = c->next)
    {
      memcpy (p, c->data, c->size);
      p += c->size;
    }
}

char *dynbuf::linearise ()
{
  if (first->next)
    {
      finish ();

      chunk *add = (chunk *)new char [sizeof (chunk) + _size];

      add->next = 0;
      linearise ((void *)add->data);
      clear ();

      first = last = add;
      ptr   = last->data + _size;
      _size = 0;
      room  = 0;
    }

  return first->data;
}

void dynbuf::add (sint32 i)
{
  char buf [max_sint32_size];
  char *p = buf + sizeof (buf);
  char neg;

  uint32 val;

  if (i < 0)
    {
      neg = '-';
      val = -i;
    }
  else
    {
      neg = 0;
      val = i;
    }

  do
    {
      uint32 div = val / 10;
      *--p = '0' + char (val - div * 10);
      val = div;
    }
  while (val);

  if (neg)
    *--p = neg;

  add ((void *)p, buf + sizeof (buf) - p);
}

void dynbuf::add (sint64 i)
{
  if (i > -10000000 && i < 10000000)
    {
      add (sint32 (i));
      return;
    }

  char buf [max_sint64_size];
  char *p = buf + sizeof (buf);
  char neg;

  uint64 val;

  if (i < 0)
    {
      neg = '-';
      val = -i;
    }
  else
    {
      neg = 0;
      val = i;
    }

  do
    {
      uint64 div = val / 10;
      *--p = '0' + char (val - div * 10);
      val = div;
    }
  while (val);

  if (neg)
    *--p = neg;

  add ((void *)p, buf + sizeof (buf) - p);
}

Revision:	1.4
Committed:	Sat Sep 2 16:37:58 2006 UTC (17 years, 9 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.3:	+23 -14 lines
Log Message:	never, ever optimise if you don't need to
#	Content
1	#define __STDC_CONSTANT_MACROS
2	#include <stdint.h>
3
4	#ifndef UINT64_C
5	# error missing c99 support, define UINT64_C yourself
6	# define UINT64_C(c) c ## LL
7	#endif
8
9	#include "global.h"
10
11	#include <cstdio>
12
13	dynbuf::dynbuf (int initial, int extend)
14	{
15	_size = 0;
16	ext = extend;
17	first = last = (chunk *)new char [sizeof (chunk) + initial];
18	first->next = 0;
19	room = initial;
20	ptr = first->data;
21	}
22
23	dynbuf::~dynbuf ()
24	{
25	clear ();
26	}
27
28	void dynbuf::clear ()
29	{
30	while (first)
31	{
32	chunk *next = first->next;
33	delete [] (char *)first;
34	first = next;
35	}
36	}
37
38	void dynbuf::finish ()
39	{
40	// finalise current chunk
41	_size += last->size = ptr - last->data;
42	}
43
44	void dynbuf::_reserve (int size)
45	{
46	finish ();
47
48	do
49	{
50	ext += ext >> 1;
51	ext = (ext + 15) & ~15;
52	}
53	while (ext < size);
54
55	chunk add = (chunk )new char [sizeof (chunk) + ext];
56	add->next = 0;
57
58	last->next = add;
59	last = add;
60
61	room = ext;
62	ptr = last->data;
63	}
64
65	void dynbuf::linearise (void *data)
66	{
67	char p = (char )data;
68
69	last->size = ptr - last->data;
70
71	for (chunk *c = first; c; c = c->next)
72	{
73	memcpy (p, c->data, c->size);
74	p += c->size;
75	}
76	}
77
78	char *dynbuf::linearise ()
79	{
80	if (first->next)
81	{
82	finish ();
83
84	chunk add = (chunk )new char [sizeof (chunk) + _size];
85
86	add->next = 0;
87	linearise ((void *)add->data);
88	clear ();
89
90	first = last = add;
91	ptr = last->data + _size;
92	_size = 0;
93	room = 0;
94	}
95
96	return first->data;
97	}
98
99	void dynbuf::add (sint32 i)
100	{
101	char buf [max_sint32_size];
102	char *p = buf + sizeof (buf);
103	char neg;
104
105	uint32 val;
106
107	if (i < 0)
108	{
109	neg = '-';
110	val = -i;
111	}
112	else
113	{
114	neg = 0;
115	val = i;
116	}
117
118	do
119	{
120	uint32 div = val / 10;
121	--p = '0' + char (val - div 10);
122	val = div;
123	}
124	while (val);
125
126	if (neg)
127	*--p = neg;
128
129	add ((void *)p, buf + sizeof (buf) - p);
130	}
131
132	void dynbuf::add (sint64 i)
133	{
134	if (i > -10000000 && i < 10000000)
135	{
136	add (sint32 (i));
137	return;
138	}
139
140	char buf [max_sint64_size];
141	char *p = buf + sizeof (buf);
142	char neg;
143
144	uint64 val;
145
146	if (i < 0)
147	{
148	neg = '-';
149	val = -i;
150	}
151	else
152	{
153	neg = 0;
154	val = i;
155	}
156
157	do
158	{
159	uint64 div = val / 10;
160	--p = '0' + char (val - div 10);
161	val = div;
162	}
163	while (val);
164
165	if (neg)
166	*--p = neg;
167
168	add ((void *)p, buf + sizeof (buf) - p);
169	}
170