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1 | /* |
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2 | * This file is part of Deliantra, the Roguelike Realtime MMORPG. |
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3 | * |
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4 | * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
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5 | * Copyright (©) 2002,2007 Mark Wedel & Crossfire Development Team |
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6 | * Copyright (©) 1992,2007 Frank Tore Johansen |
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7 | * |
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8 | * Deliantra is free software: you can redistribute it and/or modify it under |
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9 | * the terms of the Affero GNU General Public License as published by the |
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10 | * Free Software Foundation, either version 3 of the License, or (at your |
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11 | * option) any later version. |
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12 | * |
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13 | * This program is distributed in the hope that it will be useful, |
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 | * GNU General Public License for more details. |
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17 | * |
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18 | * You should have received a copy of the Affero GNU General Public License |
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19 | * and the GNU General Public License along with this program. If not, see |
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20 | * <http://www.gnu.org/licenses/>. |
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21 | * |
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22 | * The authors can be reached via e-mail to <support@deliantra.net> |
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23 | */ |
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24 | |
1 | #ifndef DYNBUF_H__ |
25 | #ifndef DYNBUF_H__ |
2 | #define DYNBUF_H__ |
26 | #define DYNBUF_H__ |
3 | |
27 | |
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28 | #include <cstdarg> |
4 | #include <cstring> |
29 | #include <cstring> |
5 | #include <cassert> |
30 | #include <cassert> |
6 | |
31 | |
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32 | #include "util.h" |
7 | #include "shstr.h" |
33 | #include "shstr.h" |
8 | |
34 | |
9 | // this is a "buffer" that can grow fast |
35 | // this is a "buffer" that can grow fast |
10 | // and is still somewhat space-efficient. |
36 | // and is still somewhat space-efficient. |
11 | // unlike obstacks or other data structures, |
37 | // unlike obstacks or other data structures, |
… | |
… | |
16 | { |
42 | { |
17 | protected: |
43 | protected: |
18 | struct chunk |
44 | struct chunk |
19 | { |
45 | { |
20 | chunk *next; |
46 | chunk *next; |
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47 | int alloc; |
21 | int size; |
48 | int size; |
22 | char data[0]; |
49 | char data[0]; |
23 | }; |
50 | }; |
24 | |
51 | |
25 | char *ptr; |
52 | char *ptr, *end; |
26 | int room; |
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27 | int ext; |
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28 | int _size; |
53 | int _size; |
29 | |
54 | |
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55 | int extend, cextend; |
30 | chunk *first, *last; |
56 | chunk *first, *last; |
31 | |
57 | |
32 | void _reserve (int size); |
58 | void reserve (int size); |
33 | void clear (); |
59 | void init (int initial); // allocate sinitial chunk |
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60 | void free (chunk *&chain); // free chain of chunks |
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61 | char *_linearise (); |
34 | void finish (); |
62 | void finalise (); |
35 | |
63 | |
36 | public: |
64 | public: |
37 | |
65 | |
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66 | // initial - the size of the initial chunk to be allocated |
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67 | // extend - first incremental step when buffer size exceeded |
38 | dynbuf (int initial = 4096, int extend = 16384); |
68 | dynbuf (int initial = 4096, int extend = 16384) |
39 | ~dynbuf (); |
69 | : extend (extend) |
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70 | { |
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71 | init (initial); |
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72 | } |
40 | |
73 | |
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74 | ~dynbuf () |
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75 | { |
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76 | free (first); |
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77 | } |
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78 | |
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79 | // resets the dynbuf, but does not free the first chunk |
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80 | // which is either of size "initial" or the size of the last |
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81 | // linearise |
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82 | void clear (); |
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83 | |
41 | int size () { return _size + (ptr - last->data); } |
84 | int size () const { return _size + (ptr - last->data); } |
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85 | bool empty () const { return !size (); } |
42 | |
86 | |
43 | void linearise (void *data); |
87 | void linearise (void *data); |
44 | char *linearise (); |
88 | char *linearise () // does not 0-terminate(!) |
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89 | { |
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90 | return first->next ? _linearise () : first->data; |
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91 | } |
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92 | |
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93 | int room () const { return end - ptr; } |
45 | |
94 | |
46 | char *force (int size) |
95 | char *force (int size) |
47 | { |
96 | { |
48 | if (room < size) |
97 | if (expect_false (ptr + size >= end)) |
49 | _reserve (size); |
98 | reserve (size); |
50 | |
99 | |
51 | return ptr; |
100 | return ptr; |
52 | } |
101 | } |
53 | |
102 | |
54 | char *alloc (int size) |
103 | char *falloc (int size) |
55 | { |
104 | { |
56 | char *res = force (size); |
105 | char *res = ptr; |
57 | |
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58 | room -= size; |
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59 | ptr += size; |
106 | ptr += size; |
60 | |
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61 | return res; |
107 | return res; |
62 | } |
108 | } |
63 | |
109 | |
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110 | char *alloc (int size) |
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111 | { |
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112 | force (size); |
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113 | return falloc (size); |
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114 | } |
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115 | |
64 | void fadd (char c) { --room; *ptr++ = c; } |
116 | void fadd (char c) { *ptr++ = c; } |
65 | void fadd (unsigned char c) { fadd (char (c)); } |
117 | void fadd (unsigned char c) { fadd (char (c)); } |
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118 | void fadd (const void *p, int len) |
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119 | { |
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120 | memcpy (falloc (len), p, len); |
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121 | } |
66 | |
122 | |
67 | void add (const void *p, int len) |
123 | void add (const void *p, int len) |
68 | { |
124 | { |
69 | memcpy (alloc (len), p, len); |
125 | force (len); |
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126 | fadd (p, len); |
70 | } |
127 | } |
71 | |
128 | |
72 | void add (char c) |
129 | void add (char c) |
73 | { |
130 | { |
74 | alloc (1)[0] = c; |
131 | alloc (1)[0] = c; |
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77 | void add (const char *s) |
134 | void add (const char *s) |
78 | { |
135 | { |
79 | add (s, strlen (s)); |
136 | add (s, strlen (s)); |
80 | } |
137 | } |
81 | |
138 | |
82 | void add (const shstr &s) |
139 | void add (shstr_tmp s) |
83 | { |
140 | { |
84 | add (s.s, s.length ()); |
141 | add (s.s, s.length ()); |
85 | } |
142 | } |
86 | |
143 | |
87 | //TODO |
144 | //TODO |
88 | //void add_destructive (dynbuf &buf); |
145 | //void add_destructive (dynbuf &buf); |
89 | |
146 | |
90 | dynbuf &operator << (char c) { add (c); return *this; } |
147 | dynbuf &operator << (char c) { add (c); return *this; } |
91 | dynbuf &operator << (unsigned char c) { return *this << char (c); } |
148 | dynbuf &operator << (unsigned char c) { return *this << char (c); } |
92 | dynbuf &operator << (const char *s) { add (s); return *this; } |
149 | dynbuf &operator << (const char *s) { add (s); return *this; } |
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150 | dynbuf &operator << (shstr_tmp s) { add (s); return *this; } |
93 | dynbuf &operator << (const std::string &s) { add (s.data(), s.size ()); return *this; } |
151 | dynbuf &operator << (const std::string &s) { add (s.data(), s.size ()); return *this; } |
94 | |
152 | |
95 | operator std::string (); |
153 | operator std::string (); |
96 | }; |
154 | }; |
97 | |
155 | |
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100 | dynbuf_text (int initial = 4096, int extend = 16384) |
158 | dynbuf_text (int initial = 4096, int extend = 16384) |
101 | : dynbuf (initial, extend) |
159 | : dynbuf (initial, extend) |
102 | { } |
160 | { } |
103 | |
161 | |
104 | using dynbuf::add; |
162 | using dynbuf::add; |
105 | |
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106 | static const int max_sint32_size = 11; |
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107 | static const int max_sint64_size = 20; |
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108 | |
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109 | void add (sint32 i); |
163 | void add (sint32 i); |
110 | void add (sint64 i); |
164 | void add (sint64 i); |
111 | |
165 | |
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166 | //TODO: should optimise the case printf "(name %+d)" as it comes up extremely often |
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167 | |
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168 | //using dynbuf::operator <<; // doesn't work, sometimes C++ just suxx |
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169 | // instead we use an ugly template function |
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170 | template<typename T> |
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171 | dynbuf_text &operator << (T c) { *(dynbuf *)this << c; return *this; } |
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172 | |
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173 | dynbuf_text &operator << (sint16 i) { add (sint32 (i)); return *this; } |
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174 | dynbuf_text &operator << (uint16 i) { add (sint32 (i)); return *this; } |
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175 | dynbuf_text &operator << (sint32 i) { add (sint32 (i)); return *this; } |
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176 | dynbuf_text &operator << (sint64 i) { add (sint64 (i)); return *this; } |
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177 | dynbuf_text &operator << (uint32 i) { add (sint64 (i)); return *this; } |
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178 | dynbuf_text &operator << (uint64 i) { add (sint64 (i)); return *this; } |
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179 | |
112 | void printf (const char *format, ...); |
180 | void printf (const char *format, ...); |
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181 | void vprintf (const char *format, va_list ap); |
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182 | |
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183 | void add_abilities (const char *name, uint32 abilities); |
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184 | void add_paths (const char *name, uint32 paths); |
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185 | |
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186 | // returns the string, linearised and with trailing \0 |
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187 | operator char *(); |
113 | }; |
188 | }; |
114 | |
189 | |
115 | #endif |
190 | #endif |
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191 | |