1 |
/* |
2 |
* This file is part of Crossfire TRT, the Multiplayer Online Role Playing Game. |
3 |
* |
4 |
* Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team |
5 |
* Copyright (©) 2002,2007 Mark Wedel & Crossfire Development Team |
6 |
* Copyright (©) 1992,2007 Frank Tore Johansen |
7 |
* |
8 |
* Crossfire TRT is free software; you can redistribute it and/or modify it |
9 |
* under the terms of the GNU General Public License as published by the Free |
10 |
* Software Foundation; either version 2 of the License, or (at your option) |
11 |
* any later version. |
12 |
* |
13 |
* This program is distributed in the hope that it will be useful, but |
14 |
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
15 |
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
16 |
* for more details. |
17 |
* |
18 |
* You should have received a copy of the GNU General Public License along |
19 |
* with Crossfire TRT; if not, write to the Free Software Foundation, Inc. 51 |
20 |
* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
21 |
* |
22 |
* The authors can be reached via e-mail to <crossfire@schmorp.de> |
23 |
*/ |
24 |
|
25 |
#ifndef DYNBUF_H__ |
26 |
#define DYNBUF_H__ |
27 |
|
28 |
#include <cstring> |
29 |
#include <cassert> |
30 |
|
31 |
#include "util.h" |
32 |
#include "shstr.h" |
33 |
|
34 |
// this is a "buffer" that can grow fast |
35 |
// and is still somewhat space-efficient. |
36 |
// unlike obstacks or other data structures, |
37 |
// it never moves data around. basically, |
38 |
// this is a fast strstream without the overhead. |
39 |
|
40 |
struct dynbuf |
41 |
{ |
42 |
protected: |
43 |
struct chunk |
44 |
{ |
45 |
chunk *next; |
46 |
int alloc; |
47 |
int size; |
48 |
char data[0]; |
49 |
}; |
50 |
|
51 |
char *ptr, *end; |
52 |
int ext; |
53 |
int _size; |
54 |
|
55 |
chunk *first, *last; |
56 |
|
57 |
void _reserve (int size); |
58 |
void _clear (); |
59 |
void clear (); |
60 |
void finish (); |
61 |
|
62 |
public: |
63 |
|
64 |
dynbuf (int initial = 4096, int extend = 16384); |
65 |
~dynbuf (); |
66 |
|
67 |
int size () const { return _size + (ptr - last->data); } |
68 |
bool empty () const { return !size (); } |
69 |
|
70 |
void linearise (void *data); |
71 |
char *linearise (); // does not 0-terminate(!) |
72 |
|
73 |
int room () const { return end - ptr; } |
74 |
|
75 |
char *force (int size) |
76 |
{ |
77 |
if (expect_false (ptr + size >= end)) |
78 |
_reserve (size); |
79 |
|
80 |
return ptr; |
81 |
} |
82 |
|
83 |
char *falloc (int size) |
84 |
{ |
85 |
char *res = ptr; |
86 |
ptr += size; |
87 |
return res; |
88 |
} |
89 |
|
90 |
char *alloc (int size) |
91 |
{ |
92 |
force (size); |
93 |
return falloc (size); |
94 |
} |
95 |
|
96 |
void fadd (char c) { *ptr++ = c; } |
97 |
void fadd (unsigned char c) { fadd (char (c)); } |
98 |
void fadd (const void *p, int len) |
99 |
{ |
100 |
memcpy (falloc (len), p, len); |
101 |
} |
102 |
|
103 |
void add (const void *p, int len) |
104 |
{ |
105 |
force (len); |
106 |
fadd (p, len); |
107 |
} |
108 |
|
109 |
void add (char c) |
110 |
{ |
111 |
alloc (1)[0] = c; |
112 |
} |
113 |
|
114 |
void add (const char *s) |
115 |
{ |
116 |
add (s, strlen (s)); |
117 |
} |
118 |
|
119 |
void add (const shstr &s) |
120 |
{ |
121 |
add (s.s, s.length ()); |
122 |
} |
123 |
|
124 |
//TODO |
125 |
//void add_destructive (dynbuf &buf); |
126 |
|
127 |
dynbuf &operator << (char c) { add (c); return *this; } |
128 |
dynbuf &operator << (unsigned char c) { return *this << char (c); } |
129 |
dynbuf &operator << (const char *s) { add (s); return *this; } |
130 |
dynbuf &operator << (const shstr &s) { add (s); return *this; } |
131 |
dynbuf &operator << (const std::string &s) { add (s.data(), s.size ()); return *this; } |
132 |
|
133 |
operator std::string (); |
134 |
}; |
135 |
|
136 |
struct dynbuf_text : dynbuf |
137 |
{ |
138 |
dynbuf_text (int initial = 4096, int extend = 16384) |
139 |
: dynbuf (initial, extend) |
140 |
{ } |
141 |
|
142 |
using dynbuf::add; |
143 |
|
144 |
void add (sint32 i); |
145 |
void add (sint64 i); |
146 |
|
147 |
void printf (const char *format, ...); |
148 |
}; |
149 |
|
150 |
#endif |
151 |
|