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147 lines
3.6 KiB
C
147 lines
3.6 KiB
C
/************************************************
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bubblebabble.c - BubbleBabble encoding support
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$Author$
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created at: Fri Oct 13 18:31:42 JST 2006
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Copyright (C) 2006 Akinori MUSHA
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$Id$
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************************************************/
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#include <ruby/ruby.h>
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#include "../digest.h"
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static ID id_digest;
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static VALUE
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bubblebabble_str_new(VALUE str_digest)
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{
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char *digest;
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size_t digest_len;
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VALUE str;
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char *p;
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size_t i, j, seed = 1;
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static const char vowels[] = {
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'a', 'e', 'i', 'o', 'u', 'y'
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};
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static const char consonants[] = {
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'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm', 'n',
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'p', 'r', 's', 't', 'v', 'z', 'x'
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};
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StringValue(str_digest);
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digest = RSTRING_PTR(str_digest);
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digest_len = RSTRING_LEN(str_digest);
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if ((LONG_MAX - 2) / 3 < (digest_len | 1)) {
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rb_raise(rb_eRuntimeError, "digest string too long");
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}
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str = rb_str_new(0, (digest_len | 1) * 3 + 2);
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p = RSTRING_PTR(str);
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i = j = 0;
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p[j++] = 'x';
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for (;;) {
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unsigned char byte1, byte2;
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if (i >= digest_len) {
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p[j++] = vowels[seed % 6];
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p[j++] = consonants[16];
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p[j++] = vowels[seed / 6];
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break;
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}
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byte1 = digest[i++];
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p[j++] = vowels[(((byte1 >> 6) & 3) + seed) % 6];
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p[j++] = consonants[(byte1 >> 2) & 15];
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p[j++] = vowels[((byte1 & 3) + (seed / 6)) % 6];
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if (i >= digest_len) {
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break;
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}
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byte2 = digest[i++];
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p[j++] = consonants[(byte2 >> 4) & 15];
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p[j++] = '-';
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p[j++] = consonants[byte2 & 15];
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seed = (seed * 5 + byte1 * 7 + byte2) % 36;
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}
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p[j] = 'x';
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return str;
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}
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/* Document-method: Digest::bubblebabble
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*
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* call-seq:
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* Digest.bubblebabble(string) -> bubblebabble_string
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*
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* Returns a BubbleBabble encoded version of a given _string_.
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*/
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static VALUE
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rb_digest_s_bubblebabble(VALUE klass, VALUE str)
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{
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return bubblebabble_str_new(str);
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}
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/* Document-method: Digest::Class::bubblebabble
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*
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* call-seq:
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* Digest::Class.bubblebabble(string, ...) -> hash_string
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*
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* Returns the BubbleBabble encoded hash value of a given _string_.
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*/
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static VALUE
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rb_digest_class_s_bubblebabble(int argc, VALUE *argv, VALUE klass)
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{
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return bubblebabble_str_new(rb_funcallv(klass, id_digest, argc, argv));
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}
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/* Document-method: Digest::Instance#bubblebabble
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*
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* call-seq:
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* digest_obj.bubblebabble -> hash_string
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*
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* Returns the resulting hash value in a Bubblebabble encoded form.
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*/
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static VALUE
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rb_digest_instance_bubblebabble(VALUE self)
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{
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return bubblebabble_str_new(rb_funcall(self, id_digest, 0));
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}
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/*
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* This module adds some methods to Digest classes to perform
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* BubbleBabble encoding.
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*/
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void
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Init_bubblebabble(void)
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{
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#undef rb_intern
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VALUE rb_mDigest, rb_mDigest_Instance, rb_cDigest_Class;
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rb_require("digest");
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rb_mDigest = rb_path2class("Digest");
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rb_mDigest_Instance = rb_path2class("Digest::Instance");
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rb_cDigest_Class = rb_path2class("Digest::Class");
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#if 0
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rb_mDigest = rb_define_module("Digest");
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rb_mDigest_Instance = rb_define_module_under(rb_mDigest, "Instance");
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rb_cDigest_Class = rb_define_class_under(rb_mDigest, "Class", rb_cObject);
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#endif
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rb_define_module_function(rb_mDigest, "bubblebabble", rb_digest_s_bubblebabble, 1);
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rb_define_singleton_method(rb_cDigest_Class, "bubblebabble", rb_digest_class_s_bubblebabble, -1);
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rb_define_method(rb_mDigest_Instance, "bubblebabble", rb_digest_instance_bubblebabble, 0);
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id_digest = rb_intern("digest");
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}
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