| 1 | #ifndef DYNBUF_H__ |
1 | #ifndef DYNBUF_H__ |
| 2 | #define DYNBUF_H__ |
2 | #define DYNBUF_H__ |
| 3 | |
3 | |
| 4 | #include <cstring> |
4 | #include <cstring> |
| 5 | #include <cassert> |
5 | #include <cassert> |
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6 | |
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7 | #include "util.h" |
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8 | #include "shstr.h" |
| 6 | |
9 | |
| 7 | // this is a "buffer" that can grow fast |
10 | // this is a "buffer" that can grow fast |
| 8 | // and is still somewhat space-efficient. |
11 | // and is still somewhat space-efficient. |
| 9 | // unlike obstacks or other data structures, |
12 | // unlike obstacks or other data structures, |
| 10 | // it never moves data around. basically, |
13 | // it never moves data around. basically, |
| 11 | // this is a fast strstream without the overhead. |
14 | // this is a fast strstream without the overhead. |
| 12 | |
15 | |
| 13 | class dynbuf |
16 | struct dynbuf |
| 14 | { |
17 | { |
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18 | protected: |
| 15 | struct chunk |
19 | struct chunk |
| 16 | { |
20 | { |
| 17 | chunk *next; |
21 | chunk *next; |
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22 | int alloc; |
| 18 | int size; |
23 | int size; |
| 19 | char data[0]; |
24 | char data[0]; |
| 20 | }; |
25 | }; |
| 21 | |
26 | |
| 22 | char *ptr; |
27 | char *ptr, *end; |
| 23 | int room; |
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| 24 | int ext; |
28 | int ext; |
| 25 | int _size; |
29 | int _size; |
| 26 | |
30 | |
| 27 | chunk *first, *last; |
31 | chunk *first, *last; |
| 28 | |
32 | |
| 29 | void _reserve (int size); |
33 | void _reserve (int size); |
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34 | void _clear (); |
| 30 | void clear (); |
35 | void clear (); |
| 31 | void finish (); |
36 | void finish (); |
| 32 | |
37 | |
| 33 | public: |
38 | public: |
| 34 | |
39 | |
| 35 | dynbuf (int initial = 128, int extend = 128); |
40 | dynbuf (int initial = 4096, int extend = 16384); |
| 36 | ~dynbuf (); |
41 | ~dynbuf (); |
| 37 | |
42 | |
| 38 | int size () { return _size + (ptr - last->data); } |
43 | int size () const { return _size + (ptr - last->data); } |
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44 | bool empty () const { return !size (); } |
| 39 | |
45 | |
| 40 | void linearise (void *data); |
46 | void linearise (void *data); |
| 41 | char *linearise (); |
47 | char *linearise (); // does not 0-terminate(!) |
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48 | |
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49 | int room () const { return end - ptr; } |
| 42 | |
50 | |
| 43 | char *force (int size) |
51 | char *force (int size) |
| 44 | { |
52 | { |
| 45 | if (room < size) |
53 | if (expect_false (ptr + size >= end)) |
| 46 | _reserve (size); |
54 | _reserve (size); |
| 47 | |
55 | |
| 48 | return ptr; |
56 | return ptr; |
| 49 | } |
57 | } |
| 50 | |
58 | |
| 51 | char *alloc (int size) |
59 | char *alloc (int size) |
| 52 | { |
60 | { |
| 53 | char *res = force (size); |
61 | char *res = force (size); |
| 54 | |
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| 55 | room -= size; |
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| 56 | ptr += size; |
62 | ptr += size; |
| 57 | |
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| 58 | return res; |
63 | return res; |
| 59 | } |
64 | } |
| 60 | |
65 | |
| 61 | void fadd (char c) { --room; *ptr++ = c; } |
66 | void fadd (char c) { *ptr++ = c; } |
| 62 | void fadd (unsigned char c) { fadd (char (c));; } |
67 | void fadd (unsigned char c) { fadd (char (c)); } |
| 63 | |
68 | |
| 64 | void add (const void *p, int len) |
69 | void add (const void *p, int len) |
| 65 | { |
70 | { |
| 66 | memcpy (alloc (len), p, len); |
71 | memcpy (alloc (len), p, len); |
| 67 | } |
72 | } |
| 68 | |
73 | |
| 69 | void add (char c) |
74 | void add (char c) |
| 70 | { |
75 | { |
| 71 | if (room < 1) |
76 | alloc (1)[0] = c; |
| 72 | _reserve (1); |
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| 73 | |
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| 74 | room--; |
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| 75 | *ptr++ = c; |
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| 76 | } |
77 | } |
| 77 | |
78 | |
| 78 | void add (const char *s) |
79 | void add (const char *s) |
| 79 | { |
80 | { |
| 80 | add (s, strlen (s)); |
81 | add (s, strlen (s)); |
| 81 | } |
82 | } |
| 82 | |
83 | |
| 83 | static const int max_sint32_size = 11; |
84 | void add (const shstr &s) |
| 84 | static const int max_sint64_size = 20; |
85 | { |
| 85 | |
86 | add (s.s, s.length ()); |
| 86 | void add (sint32 i); |
87 | } |
| 87 | void add (sint64 i); |
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| 88 | |
88 | |
| 89 | //TODO |
89 | //TODO |
| 90 | //void add_destructive (dynbuf &buf); |
90 | //void add_destructive (dynbuf &buf); |
| 91 | |
91 | |
| 92 | dynbuf &operator << (char c) { add (c); return *this; } |
92 | dynbuf &operator << (char c) { add (c); return *this; } |
| 93 | dynbuf &operator << (unsigned char c) { return *this << char (c); } |
93 | dynbuf &operator << (unsigned char c) { return *this << char (c); } |
| 94 | dynbuf &operator << (const char *s) { add (s); return *this; } |
94 | dynbuf &operator << (const char *s) { add (s); return *this; } |
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95 | dynbuf &operator << (const shstr &s) { add (s); return *this; } |
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96 | dynbuf &operator << (const std::string &s) { add (s.data(), s.size ()); return *this; } |
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97 | |
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98 | operator std::string (); |
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99 | }; |
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100 | |
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101 | struct dynbuf_text : dynbuf |
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102 | { |
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103 | dynbuf_text (int initial = 4096, int extend = 16384) |
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104 | : dynbuf (initial, extend) |
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105 | { } |
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106 | |
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107 | using dynbuf::add; |
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108 | |
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109 | static const int max_sint32_size = 11; |
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110 | static const int max_sint64_size = 20; |
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111 | |
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112 | void add (sint32 i); |
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113 | void add (sint64 i); |
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114 | |
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115 | void printf (const char *format, ...); |
| 95 | }; |
116 | }; |
| 96 | |
117 | |
| 97 | #endif |
118 | #endif |
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119 | |
