1
2 #ifndef _FBUFFER_H_
3 #define _FBUFFER_H_
4
5 #include "ruby.h"
6
7 #ifndef RHASH_SIZE
8 #define RHASH_SIZE(hsh) (RHASH(hsh)->tbl->num_entries)
9 #endif
10
11 #ifndef RFLOAT_VALUE
12 #define RFLOAT_VALUE(val) (RFLOAT(val)->value)
13 #endif
14
15 #ifndef RARRAY_LEN
16 #define RARRAY_LEN(ARRAY) RARRAY(ARRAY)->len
17 #endif
18 #ifndef RSTRING_PTR
19 #define RSTRING_PTR(string) RSTRING(string)->ptr
20 #endif
21 #ifndef RSTRING_LEN
22 #define RSTRING_LEN(string) RSTRING(string)->len
23 #endif
24
25 #ifdef PRIsVALUE
26 # define RB_OBJ_CLASSNAME(obj) rb_obj_class(obj)
27 # define RB_OBJ_STRING(obj) (obj)
28 #else
29 # define PRIsVALUE "s"
30 # define RB_OBJ_CLASSNAME(obj) rb_obj_classname(obj)
31 # define RB_OBJ_STRING(obj) StringValueCStr(obj)
32 #endif
33
34 #ifdef HAVE_RUBY_ENCODING_H
35 #include "ruby/encoding.h"
36 #define FORCE_UTF8(obj) rb_enc_associate((obj), rb_utf8_encoding())
37 #else
38 #define FORCE_UTF8(obj)
39 #endif
40
41 /* We don't need to guard objects for rbx, so let's do nothing at all. */
42 #ifndef RB_GC_GUARD
43 #define RB_GC_GUARD(object)
44 #endif
45
46 typedef struct FBufferStruct {
47 unsigned long initial_length;
48 char *ptr;
49 unsigned long len;
50 unsigned long capa;
51 } FBuffer;
52
53 #define FBUFFER_INITIAL_LENGTH_DEFAULT 1024
54
55 #define FBUFFER_PTR(fb) (fb->ptr)
56 #define FBUFFER_LEN(fb) (fb->len)
57 #define FBUFFER_CAPA(fb) (fb->capa)
58 #define FBUFFER_PAIR(fb) FBUFFER_PTR(fb), FBUFFER_LEN(fb)
59
60 static FBuffer *fbuffer_alloc(unsigned long initial_length);
61 static void fbuffer_free(FBuffer *fb);
62 static void fbuffer_clear(FBuffer *fb);
63 static void fbuffer_append(FBuffer *fb, const char *newstr, unsigned long len);
64 #ifdef JSON_GENERATOR
65 static void fbuffer_append_long(FBuffer *fb, long number);
66 #endif
67 static void fbuffer_append_char(FBuffer *fb, char newchr);
68 #ifdef JSON_GENERATOR
69 static FBuffer *fbuffer_dup(FBuffer *fb);
70 static VALUE fbuffer_to_s(FBuffer *fb);
71 #endif
72
fbuffer_alloc(unsigned long initial_length)73 static FBuffer *fbuffer_alloc(unsigned long initial_length)
74 {
75 FBuffer *fb;
76 if (initial_length <= 0) initial_length = FBUFFER_INITIAL_LENGTH_DEFAULT;
77 fb = ALLOC(FBuffer);
78 memset((void *) fb, 0, sizeof(FBuffer));
79 fb->initial_length = initial_length;
80 return fb;
81 }
82
fbuffer_free(FBuffer * fb)83 static void fbuffer_free(FBuffer *fb)
84 {
85 if (fb->ptr) ruby_xfree(fb->ptr);
86 ruby_xfree(fb);
87 }
88
fbuffer_clear(FBuffer * fb)89 static void fbuffer_clear(FBuffer *fb)
90 {
91 fb->len = 0;
92 }
93
fbuffer_inc_capa(FBuffer * fb,unsigned long requested)94 static void fbuffer_inc_capa(FBuffer *fb, unsigned long requested)
95 {
96 unsigned long required;
97
98 if (!fb->ptr) {
99 fb->ptr = ALLOC_N(char, fb->initial_length);
100 fb->capa = fb->initial_length;
101 }
102
103 for (required = fb->capa; requested > required - fb->len; required <<= 1);
104
105 if (required > fb->capa) {
106 REALLOC_N(fb->ptr, char, required);
107 fb->capa = required;
108 }
109 }
110
fbuffer_append(FBuffer * fb,const char * newstr,unsigned long len)111 static void fbuffer_append(FBuffer *fb, const char *newstr, unsigned long len)
112 {
113 if (len > 0) {
114 fbuffer_inc_capa(fb, len);
115 MEMCPY(fb->ptr + fb->len, newstr, char, len);
116 fb->len += len;
117 }
118 }
119
120 #ifdef JSON_GENERATOR
fbuffer_append_str(FBuffer * fb,VALUE str)121 static void fbuffer_append_str(FBuffer *fb, VALUE str)
122 {
123 const char *newstr = StringValuePtr(str);
124 unsigned long len = RSTRING_LEN(str);
125
126 RB_GC_GUARD(str);
127
128 fbuffer_append(fb, newstr, len);
129 }
130 #endif
131
fbuffer_append_char(FBuffer * fb,char newchr)132 static void fbuffer_append_char(FBuffer *fb, char newchr)
133 {
134 fbuffer_inc_capa(fb, 1);
135 *(fb->ptr + fb->len) = newchr;
136 fb->len++;
137 }
138
139 #ifdef JSON_GENERATOR
freverse(char * start,char * end)140 static void freverse(char *start, char *end)
141 {
142 char c;
143
144 while (end > start) {
145 c = *end, *end-- = *start, *start++ = c;
146 }
147 }
148
fltoa(long number,char * buf)149 static long fltoa(long number, char *buf)
150 {
151 static char digits[] = "0123456789";
152 long sign = number;
153 char* tmp = buf;
154
155 if (sign < 0) number = -number;
156 do *tmp++ = digits[number % 10]; while (number /= 10);
157 if (sign < 0) *tmp++ = '-';
158 freverse(buf, tmp - 1);
159 return tmp - buf;
160 }
161
fbuffer_append_long(FBuffer * fb,long number)162 static void fbuffer_append_long(FBuffer *fb, long number)
163 {
164 char buf[20];
165 unsigned long len = fltoa(number, buf);
166 fbuffer_append(fb, buf, len);
167 }
168
fbuffer_dup(FBuffer * fb)169 static FBuffer *fbuffer_dup(FBuffer *fb)
170 {
171 unsigned long len = fb->len;
172 FBuffer *result;
173
174 result = fbuffer_alloc(len);
175 fbuffer_append(result, FBUFFER_PAIR(fb));
176 return result;
177 }
178
fbuffer_to_s(FBuffer * fb)179 static VALUE fbuffer_to_s(FBuffer *fb)
180 {
181 VALUE result = rb_str_new(FBUFFER_PTR(fb), FBUFFER_LEN(fb));
182 fbuffer_free(fb);
183 FORCE_UTF8(result);
184 return result;
185 }
186 #endif
187 #endif
188