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random.c: rand_random_number
* random.c (rand_random_number): add a method to return a random number like SecureRandom to Random::Formatter. * lib/securerandom.rb (random_bytes): move to Random::Formatter, the base method of the module. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49596 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu
parent
1f13a179d3
commit
b1adbd14e5
3 changed files with 170 additions and 70 deletions
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@ -1,3 +1,11 @@
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Sat Feb 14 12:20:01 2015 Nobuyoshi Nakada <nobu@ruby-lang.org>
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* random.c (rand_random_number): add a method to return a random
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number like SecureRandom to Random::Formatter.
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* lib/securerandom.rb (random_bytes): move to Random::Formatter,
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the base method of the module.
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Sat Feb 14 12:01:32 2015 Nobuyoshi Nakada <nobu@ruby-lang.org>
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* random.c (random_raw_seed): extract platform dependent random
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@ -47,26 +47,6 @@ end
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#
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module SecureRandom
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# SecureRandom.random_bytes generates a random binary string.
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#
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# The argument _n_ specifies the length of the result string.
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#
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# If _n_ is not specified or is nil, 16 is assumed.
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# It may be larger in future.
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#
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# The result may contain any byte: "\x00" - "\xff".
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#
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# p SecureRandom.random_bytes #=> "\xD8\\\xE0\xF4\r\xB2\xFC*WM\xFF\x83\x18\xF45\xB6"
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# p SecureRandom.random_bytes #=> "m\xDC\xFC/\a\x00Uf\xB2\xB2P\xBD\xFF6S\x97"
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#
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# If a secure random number generator is not available,
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# +NotImplementedError+ is raised.
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def self.random_bytes(n=nil)
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n = n ? n.to_int : 16
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gen_random(n)
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end
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if defined? OpenSSL::Random
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def self.gen_random(n)
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@pid = 0 unless defined?(@pid)
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@ -94,6 +74,26 @@ module SecureRandom
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end
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module Random::Formatter
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# SecureRandom.random_bytes generates a random binary string.
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#
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# The argument _n_ specifies the length of the result string.
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#
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# If _n_ is not specified or is nil, 16 is assumed.
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# It may be larger in future.
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#
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# The result may contain any byte: "\x00" - "\xff".
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#
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# p SecureRandom.random_bytes #=> "\xD8\\\xE0\xF4\r\xB2\xFC*WM\xFF\x83\x18\xF45\xB6"
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# p SecureRandom.random_bytes #=> "m\xDC\xFC/\a\x00Uf\xB2\xB2P\xBD\xFF6S\x97"
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#
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# If a secure random number generator is not available,
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# +NotImplementedError+ is raised.
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def random_bytes(n=nil)
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n = n ? n.to_int : 16
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gen_random(n)
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end
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# SecureRandom.hex generates a random hexadecimal string.
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#
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# The argument _n_ specifies the length, in bytes, of the random number to be generated.
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@ -168,6 +168,7 @@ module Random::Formatter
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s
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end
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=begin
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# SecureRandom.random_number generates a random number.
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#
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# If a positive integer is given as _n_,
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@ -212,6 +213,7 @@ module Random::Formatter
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Math.ldexp(i64 >> (64-Float::MANT_DIG), -Float::MANT_DIG)
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end
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end
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=end
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# SecureRandom.uuid generates a random v4 UUID (Universally Unique IDentifier).
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#
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@ -230,6 +232,11 @@ module Random::Formatter
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ary[3] = (ary[3] & 0x3fff) | 0x8000
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"%08x-%04x-%04x-%04x-%04x%08x" % ary
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end
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private
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def gen_random(n)
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self.bytes(n)
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end
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end
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SecureRandom.extend(Random::Formatter)
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185
random.c
185
random.c
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@ -196,16 +196,26 @@ genrand_int32(struct MT *mt)
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}
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/* generates a random number on [0,1) with 53-bit resolution*/
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static double int_pair_to_real_exclusive(uint32_t a, uint32_t b);
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static double
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genrand_real(struct MT *mt)
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{
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/* mt must be initialized */
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unsigned int a = genrand_int32(mt)>>5, b = genrand_int32(mt)>>6;
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unsigned int a = genrand_int32(mt), b = genrand_int32(mt);
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return int_pair_to_real_exclusive(a, b);
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}
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static double
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int_pair_to_real_exclusive(uint32_t a, uint32_t b)
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{
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a >>= 5;
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b >>= 6;
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return(a*67108864.0+b)*(1.0/9007199254740992.0);
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}
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/* generates a random number on [0,1] with 53-bit resolution*/
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static double int_pair_to_real_inclusive(uint32_t a, uint32_t b);
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#if 0
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static double
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genrand_real2(struct MT *mt)
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{
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@ -213,6 +223,7 @@ genrand_real2(struct MT *mt)
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uint32_t a = genrand_int32(mt), b = genrand_int32(mt);
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return int_pair_to_real_inclusive(a, b);
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}
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#endif
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/* These real versions are due to Isaku Wada, 2002/01/09 added */
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@ -839,10 +850,9 @@ rb_genrand_ulong_limited(unsigned long limit)
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return limited_rand(default_mt(), limit);
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}
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unsigned int
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rb_random_int32(VALUE obj)
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static unsigned int
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random_int32(VALUE obj, rb_random_t *rnd)
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{
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rb_random_t *rnd = try_get_rnd(obj);
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if (!rnd) {
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#if SIZEOF_LONG * CHAR_BIT > 32
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VALUE lim = ULONG2NUM(0x100000000UL);
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@ -856,6 +866,25 @@ rb_random_int32(VALUE obj)
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return genrand_int32(&rnd->mt);
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}
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unsigned int
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rb_random_int32(VALUE obj)
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{
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return random_int32(obj, try_get_rnd(obj));
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}
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static double
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random_real(VALUE obj, rb_random_t *rnd, int excl)
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{
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uint32_t a = random_int32(obj, rnd);
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uint32_t b = random_int32(obj, rnd);
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if (excl) {
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return int_pair_to_real_exclusive(a, b);
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}
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else {
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return int_pair_to_real_inclusive(a, b);
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}
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}
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double
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rb_random_real(VALUE obj)
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{
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@ -887,10 +916,9 @@ ulong_to_num_plus_1(unsigned long n)
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#endif
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}
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unsigned long
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rb_random_ulong_limited(VALUE obj, unsigned long limit)
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static unsigned long
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random_ulong_limited(VALUE obj, rb_random_t *rnd, unsigned long limit)
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{
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rb_random_t *rnd = try_get_rnd(obj);
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if (!rnd) {
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extern int rb_num_negative_p(VALUE);
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VALUE lim = ulong_to_num_plus_1(limit);
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@ -907,6 +935,32 @@ rb_random_ulong_limited(VALUE obj, unsigned long limit)
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return limited_rand(&rnd->mt, limit);
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}
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static VALUE
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random_ulong_limited_big(VALUE obj, rb_random_t *rnd, VALUE vmax)
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{
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if (!rnd) {
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extern int rb_num_negative_p(VALUE);
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VALUE lim = rb_big_plus(vmax, INT2FIX(1));
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VALUE v = rb_to_int(rb_funcall2(obj, id_rand, 1, &lim));
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if (rb_num_negative_p(v)) {
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rb_raise(rb_eRangeError, "random number too small %"PRIsVALUE, v);
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}
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if (FIX2LONG(rb_big_cmp(vmax, v)) < 0) {
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rb_raise(rb_eRangeError, "random number too big %"PRIsVALUE, v);
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}
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return v;
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}
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return limited_big_rand(&rnd->mt, vmax);
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}
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unsigned long
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rb_random_ulong_limited(VALUE obj, unsigned long limit)
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{
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return random_ulong_limited(obj, try_get_rnd(obj), limit);
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}
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static VALUE genrand_bytes(rb_random_t *rnd, long n);
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/*
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* call-seq: prng.bytes(size) -> a_string
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*
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@ -918,21 +972,16 @@ rb_random_ulong_limited(VALUE obj, unsigned long limit)
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static VALUE
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random_bytes(VALUE obj, VALUE len)
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{
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return rb_random_bytes(obj, NUM2LONG(rb_to_int(len)));
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return genrand_bytes(get_rnd(obj), NUM2LONG(rb_to_int(len)));
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}
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VALUE
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rb_random_bytes(VALUE obj, long n)
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static VALUE
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genrand_bytes(rb_random_t *rnd, long n)
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{
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rb_random_t *rnd = try_get_rnd(obj);
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VALUE bytes;
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char *ptr;
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unsigned int r, i;
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if (!rnd) {
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VALUE len = LONG2NUM(n);
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return rb_funcall2(obj, id_bytes, 1, &len);
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}
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bytes = rb_str_new(0, n);
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ptr = RSTRING_PTR(bytes);
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for (; n >= SIZEOF_INT32; n -= SIZEOF_INT32) {
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@ -953,6 +1002,17 @@ rb_random_bytes(VALUE obj, long n)
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return bytes;
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}
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VALUE
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rb_random_bytes(VALUE obj, long n)
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{
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rb_random_t *rnd = try_get_rnd(obj);
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if (!rnd) {
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VALUE len = LONG2NUM(n);
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return rb_funcall2(obj, id_bytes, 1, &len);
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}
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return genrand_bytes(rnd, n);
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}
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static VALUE
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range_values(VALUE vmax, VALUE *begp, VALUE *endp, int *exclp)
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{
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@ -967,20 +1027,19 @@ range_values(VALUE vmax, VALUE *begp, VALUE *endp, int *exclp)
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}
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static VALUE
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rand_int(struct MT *mt, VALUE vmax, int restrictive)
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rand_int(VALUE obj, rb_random_t *rnd, VALUE vmax, int restrictive)
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{
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/* mt must be initialized */
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long max;
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unsigned long r;
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if (FIXNUM_P(vmax)) {
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max = FIX2LONG(vmax);
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long max = FIX2LONG(vmax);
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if (!max) return Qnil;
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if (max < 0) {
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if (restrictive) return Qnil;
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max = -max;
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}
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r = limited_rand(mt, (unsigned long)max - 1);
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r = random_ulong_limited(obj, rnd, (unsigned long)max - 1);
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return ULONG2NUM(r);
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}
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else {
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@ -992,30 +1051,37 @@ rand_int(struct MT *mt, VALUE vmax, int restrictive)
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}
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vmax = rb_big_minus(vmax, INT2FIX(1));
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if (FIXNUM_P(vmax)) {
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max = FIX2LONG(vmax);
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long max = FIX2LONG(vmax);
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if (max == -1) return Qnil;
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r = limited_rand(mt, max);
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r = random_ulong_limited(obj, rnd, max);
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return LONG2NUM(r);
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}
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ret = limited_big_rand(mt, vmax);
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ret = random_ulong_limited_big(obj, rnd, vmax);
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RB_GC_GUARD(vmax);
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return ret;
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}
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}
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NORETURN(static void domain_error(void));
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static void
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domain_error(void)
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{
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VALUE error = INT2FIX(EDOM);
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rb_exc_raise(rb_class_new_instance(1, &error, rb_eSystemCallError));
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}
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static inline double
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float_value(VALUE v)
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{
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double x = RFLOAT_VALUE(v);
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if (isinf(x) || isnan(x)) {
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VALUE error = INT2FIX(EDOM);
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rb_exc_raise(rb_class_new_instance(1, &error, rb_eSystemCallError));
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domain_error();
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}
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return x;
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}
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static inline VALUE
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rand_range(struct MT* mt, VALUE range)
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rand_range(VALUE obj, rb_random_t* rnd, VALUE range)
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{
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VALUE beg = Qundef, end = Qundef, vmax, v;
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int excl = 0;
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@ -1029,7 +1095,7 @@ rand_range(struct MT* mt, VALUE range)
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if (FIXNUM_P(vmax)) {
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fixnum:
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if ((max = FIX2LONG(vmax) - excl) >= 0) {
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unsigned long r = limited_rand(mt, (unsigned long)max);
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unsigned long r = random_ulong_limited(obj, rnd, (unsigned long)max);
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v = ULONG2NUM(r);
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}
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}
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@ -1039,7 +1105,7 @@ rand_range(struct MT* mt, VALUE range)
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excl = 0;
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goto fixnum;
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}
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v = limited_big_rand(mt, vmax);
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v = random_ulong_limited_big(obj, rnd, vmax);
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}
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}
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else if (v = rb_check_to_float(vmax), !NIL_P(v)) {
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@ -1052,17 +1118,12 @@ rand_range(struct MT* mt, VALUE range)
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mid = max + min;
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max -= min;
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}
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else {
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float_value(v);
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else if (isnan(max)) {
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domain_error();
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}
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v = Qnil;
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if (max > 0.0) {
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if (excl) {
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r = genrand_real(mt);
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}
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else {
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r = genrand_real2(mt);
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}
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r = random_real(obj, rnd, excl);
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if (scale > 1) {
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return rb_float_new(+(+(+(r - 0.5) * max) * scale) + mid);
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}
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@ -1095,7 +1156,7 @@ rand_range(struct MT* mt, VALUE range)
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return v;
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}
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static VALUE rand_random(int argc, VALUE *argv, rb_random_t *rnd);
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static VALUE rand_random(int argc, VALUE *argv, VALUE obj, rb_random_t *rnd);
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/*
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* call-seq:
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@ -1129,16 +1190,17 @@ static VALUE rand_random(int argc, VALUE *argv, rb_random_t *rnd);
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static VALUE
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random_rand(int argc, VALUE *argv, VALUE obj)
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{
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return rand_random(argc, argv, get_rnd(obj));
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return rand_random(argc, argv, obj, get_rnd(obj));
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}
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static VALUE
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rand_random(int argc, VALUE *argv, rb_random_t *rnd)
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rand_random(int argc, VALUE *argv, VALUE obj, rb_random_t *rnd)
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{
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VALUE vmax, v;
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double max = 0.0;
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if (argc == 0) {
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return rb_float_new(genrand_real(&rnd->mt));
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goto float_rand;
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}
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else {
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rb_check_arity(argc, 0, 1);
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@ -1148,16 +1210,26 @@ rand_random(int argc, VALUE *argv, rb_random_t *rnd)
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v = Qnil;
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}
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else if (!RB_TYPE_P(vmax, T_FLOAT) && (v = rb_check_to_integer(vmax, "to_int"), !NIL_P(v))) {
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v = rand_int(&rnd->mt, v, 1);
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v = rand_int(obj, rnd, v, 1);
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}
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else if (v = rb_check_to_float(vmax), !NIL_P(v)) {
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double max = float_value(v);
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if (max > 0.0)
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v = rb_float_new(max * genrand_real(&rnd->mt));
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else
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max = float_value(v);
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if (max < 0.0) {
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v = Qnil;
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}
|
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else {
|
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uint32_t a, b;
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double r;
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float_rand:
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a = random_int32(obj, rnd);
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b = random_int32(obj, rnd);
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r = int_pair_to_real_exclusive(a, b);
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if (max > 0.0) r *= max;;
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v = rb_float_new(r);
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}
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}
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else if ((v = rand_range(&rnd->mt, vmax)) != Qfalse) {
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else if ((v = rand_range(obj, rnd, vmax)) != Qfalse) {
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/* nothing to do */
|
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}
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else {
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|
|
@ -1171,6 +1243,13 @@ rand_random(int argc, VALUE *argv, rb_random_t *rnd)
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return v;
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}
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static VALUE
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rand_random_number(int argc, VALUE *argv, VALUE obj)
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{
|
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if (argc == 1 && argv[0] == INT2FIX(0)) --argc;
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return rand_random(argc, argv, obj, try_get_rnd(obj));
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}
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/*
|
||||
* call-seq:
|
||||
* prng1 == prng2 -> true or false
|
||||
|
|
@ -1244,18 +1323,18 @@ static VALUE
|
|||
rb_f_rand(int argc, VALUE *argv, VALUE obj)
|
||||
{
|
||||
VALUE v, vmax, r;
|
||||
struct MT *mt = default_mt();
|
||||
rb_random_t *rnd = rand_start(&default_rand);
|
||||
|
||||
if (argc == 0) goto zero_arg;
|
||||
rb_scan_args(argc, argv, "01", &vmax);
|
||||
if (NIL_P(vmax)) goto zero_arg;
|
||||
if ((v = rand_range(mt, vmax)) != Qfalse) {
|
||||
if ((v = rand_range(Qnil, rnd, vmax)) != Qfalse) {
|
||||
return v;
|
||||
}
|
||||
vmax = rb_to_int(vmax);
|
||||
if (vmax == INT2FIX(0) || NIL_P(r = rand_int(mt, vmax, 0))) {
|
||||
if (vmax == INT2FIX(0) || NIL_P(r = rand_int(Qnil, rnd, vmax, 0))) {
|
||||
zero_arg:
|
||||
return DBL2NUM(genrand_real(mt));
|
||||
return DBL2NUM(genrand_real(&rnd->mt));
|
||||
}
|
||||
return r;
|
||||
}
|
||||
|
|
@ -1271,7 +1350,7 @@ rb_f_rand(int argc, VALUE *argv, VALUE obj)
|
|||
static VALUE
|
||||
random_s_rand(int argc, VALUE *argv, VALUE obj)
|
||||
{
|
||||
return rand_random(argc, argv, rand_start(&default_rand));
|
||||
return rand_random(argc, argv, Qnil, rand_start(&default_rand));
|
||||
}
|
||||
|
||||
#define SIP_HASH_STREAMING 0
|
||||
|
|
@ -1430,6 +1509,12 @@ InitVM_Random(void)
|
|||
rb_define_singleton_method(rb_cRandom, "raw_seed", random_raw_seed, 1);
|
||||
rb_define_private_method(CLASS_OF(rb_cRandom), "state", random_s_state, 0);
|
||||
rb_define_private_method(CLASS_OF(rb_cRandom), "left", random_s_left, 0);
|
||||
|
||||
{
|
||||
VALUE m = rb_define_module_under(rb_cRandom, "Formatter");
|
||||
rb_include_module(rb_cRandom, m);
|
||||
rb_define_method(m, "random_number", rand_random_number, -1);
|
||||
}
|
||||
}
|
||||
|
||||
#undef rb_intern
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue