Ruby 2.7.0p0(2019-12-25revision647ee6f091eafcce70ffb75ddf7e121e192ab217)

bubblebabble.c
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1 /************************************************
2
3 bubblebabble.c - BubbleBabble encoding support
4
5 $Author$
6 created at: Fri Oct 13 18:31:42 JST 2006
7
8 Copyright (C) 2006 Akinori MUSHA
9
10 $Id$
11
12 ************************************************/
13
14 #include <ruby/ruby.h>
15 #include "../digest.h"
16
17 static ID id_digest;
18
19 static VALUE
20 bubblebabble_str_new(VALUE str_digest)
21 {
22 char *digest;
23 size_t digest_len;
24 VALUE str;
25 char *p;
26 size_t i, j, seed = 1;
27 static const char vowels[] = {
28 'a', 'e', 'i', 'o', 'u', 'y'
29 };
30 static const char consonants[] = {
31 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm', 'n',
32 'p', 'r', 's', 't', 'v', 'z', 'x'
33 };
34
35 StringValue(str_digest);
36 digest = RSTRING_PTR(str_digest);
37 digest_len = RSTRING_LEN(str_digest);
38
39 if ((LONG_MAX - 2) / 3 < (digest_len | 1)) {
40 rb_raise(rb_eRuntimeError, "digest string too long");
41 }
42
43 str = rb_str_new(0, (digest_len | 1) * 3 + 2);
44 p = RSTRING_PTR(str);
45
46 i = j = 0;
47 p[j++] = 'x';
48
49 for (;;) {
50 unsigned char byte1, byte2;
51
52 if (i >= digest_len) {
53 p[j++] = vowels[seed % 6];
54 p[j++] = consonants[16];
55 p[j++] = vowels[seed / 6];
56 break;
57 }
58
59 byte1 = digest[i++];
60 p[j++] = vowels[(((byte1 >> 6) & 3) + seed) % 6];
61 p[j++] = consonants[(byte1 >> 2) & 15];
62 p[j++] = vowels[((byte1 & 3) + (seed / 6)) % 6];
63
64 if (i >= digest_len) {
65 break;
66 }
67
68 byte2 = digest[i++];
69 p[j++] = consonants[(byte2 >> 4) & 15];
70 p[j++] = '-';
71 p[j++] = consonants[byte2 & 15];
72
73 seed = (seed * 5 + byte1 * 7 + byte2) % 36;
74 }
75
76 p[j] = 'x';
77
78 return str;
79 }
80
81 /* Document-method: Digest::bubblebabble
82 *
83 * call-seq:
84 * Digest.bubblebabble(string) -> bubblebabble_string
85 *
86 * Returns a BubbleBabble encoded version of a given _string_.
87 */
88 static VALUE
89 rb_digest_s_bubblebabble(VALUE klass, VALUE str)
90 {
91 return bubblebabble_str_new(str);
92 }
93
94 /* Document-method: Digest::Class::bubblebabble
95 *
96 * call-seq:
97 * Digest::Class.bubblebabble(string, ...) -> hash_string
98 *
99 * Returns the BubbleBabble encoded hash value of a given _string_.
100 */
101 static VALUE
102 rb_digest_class_s_bubblebabble(int argc, VALUE *argv, VALUE klass)
103 {
104 return bubblebabble_str_new(rb_funcallv(klass, id_digest, argc, argv));
105 }
106
107 /* Document-method: Digest::Instance#bubblebabble
108 *
109 * call-seq:
110 * digest_obj.bubblebabble -> hash_string
111 *
112 * Returns the resulting hash value in a Bubblebabble encoded form.
113 */
114 static VALUE
115 rb_digest_instance_bubblebabble(VALUE self)
116 {
117 return bubblebabble_str_new(rb_funcall(self, id_digest, 0));
118 }
119
120 /*
121 * This module adds some methods to Digest classes to perform
122 * BubbleBabble encoding.
123 */
124 void
125 Init_bubblebabble(void)
126 {
127 #undef rb_intern
128 VALUE rb_mDigest, rb_mDigest_Instance, rb_cDigest_Class;
129
130 rb_require("digest");
131
132 rb_mDigest = rb_path2class("Digest");
133 rb_mDigest_Instance = rb_path2class("Digest::Instance");
134 rb_cDigest_Class = rb_path2class("Digest::Class");
135
136 #if 0
137 rb_mDigest = rb_define_module("Digest");
138 rb_mDigest_Instance = rb_define_module_under(rb_mDigest, "Instance");
139 rb_cDigest_Class = rb_define_class_under(rb_mDigest, "Class", rb_cObject);
140 #endif
141
142 rb_define_module_function(rb_mDigest, "bubblebabble", rb_digest_s_bubblebabble, 1);
143 rb_define_singleton_method(rb_cDigest_Class, "bubblebabble", rb_digest_class_s_bubblebabble, -1);
144 rb_define_method(rb_mDigest_Instance, "bubblebabble", rb_digest_instance_bubblebabble, 0);
145
146 id_digest = rb_intern("digest");
147 }
ID
unsigned long ID
Definition: ruby.h:103
LONG_MAX
#define LONG_MAX
Definition: ruby.h:220
rb_define_module_under
VALUE rb_define_module_under(VALUE outer, const char *name)
Definition: class.c:797
RSTRING_PTR
#define RSTRING_PTR(str)
Definition: ruby.h:1009
VALUE
unsigned long VALUE
Definition: ruby.h:102
Init_bubblebabble
void Init_bubblebabble(void)
Definition: bubblebabble.c:125
rb_intern
#define rb_intern(str)
rb_define_module
VALUE rb_define_module(const char *name)
Definition: class.c:772
StringValue
use StringValue() instead")))
rb_define_singleton_method
void rb_define_singleton_method(VALUE obj, const char *name, VALUE(*func)(ANYARGS), int argc)
Defines a singleton method for obj.
Definition: class.c:1755
rb_define_method
void rb_define_method(VALUE klass, const char *name, VALUE(*func)(ANYARGS), int argc)
Definition: class.c:1551
ruby.h
rb_funcallv
#define rb_funcallv(recv, mid, argc, argv)
Definition: rb_mjit_min_header-2.7.0.h:7899
rb_raise
void rb_raise(VALUE exc, const char *fmt,...)
Definition: error.c:2669
i
uint32_t i
Definition: rb_mjit_min_header-2.7.0.h:5464
rb_require
VALUE rb_require(const char *)
Definition: load.c:1118
rb_eRuntimeError
VALUE rb_eRuntimeError
Definition: error.c:920
rb_define_module_function
void rb_define_module_function(VALUE module, const char *name, VALUE(*func)(ANYARGS), int argc)
Defines a module function for module.
Definition: class.c:1771
rb_cObject
RUBY_EXTERN VALUE rb_cObject
Definition: ruby.h:2010
rb_funcall
#define rb_funcall(recv, mid, argc,...)
Definition: rb_mjit_min_header-2.7.0.h:6585
argv
char ** argv
Definition: ruby.c:223
klass
VALUE klass
Definition: rb_mjit_min_header-2.7.0.h:13254
str
char str[HTML_ESCAPE_MAX_LEN+1]
Definition: escape.c:18
argc
int argc
Definition: ruby.c:222
rb_str_new
#define rb_str_new(str, len)
Definition: rb_mjit_min_header-2.7.0.h:6116
rb_path2class
VALUE rb_path2class(const char *)
Definition: variable.c:268
rb_define_class_under
VALUE rb_define_class_under(VALUE outer, const char *name, VALUE super)
Defines a class under the namespace of outer.
Definition: class.c:698
RSTRING_LEN
#define RSTRING_LEN(str)
Definition: ruby.h:1005