Initial project import

tools/v/vlib/rand/rand.js.v

@@ -0,0 +1,66 @@
+module rand
+
+// init initializes the default RNG.
+fn init() {
+	default_rng = new_default()
+}
+
+fn internal_fill_buffer_from_set(mut _ PRNG, _ string, mut _ []u8) {
+	panic('todo')
+}
+
+// fn internal_string_from_set(mut rng PRNG, charset string, len int) string {
+fn internal_string_from_set(mut _ PRNG, charset string, len int) string {
+	result := ''
+	#
+	#const characters = charset.str;
+	#const charactersLength = characters.length;
+	#for (let i = 0;i < len.val;i++)
+	#result.str += characters.charAt(Math.random() * charactersLength);
+
+	_ = charset
+	_ = len
+
+	return result
+}
+
+const ulid_encoding = '0123456789ABCDEFGHJKMNPQRSTVWXYZ'
+
+fn internal_ulid_at_millisecond(mut rng PRNG, unix_time_milli u64) string {
+	mut buf := []u8{cap: 27}
+	mut t := unix_time_milli
+	mut i := 9
+	for i >= 0 {
+		buf[i] = ulid_encoding[int(t & 0x1f)]
+		t = t >> 5
+		i--
+	}
+
+	mut x := rng.u64()
+	i = 10
+	for i < 19 {
+		buf[i] = ulid_encoding[int(x & 0x1f)]
+
+		x = x >> 5
+		i++
+	}
+
+	x = rng.u64()
+	for i < 26 {
+		buf[i] = ulid_encoding[int(x & 0x1f)]
+		x = x >> 5
+		i++
+	}
+
+	res := ''
+	println(buf)
+	#res.str = buf.arr.arr.map(String.fromCharCode).join('')
+
+	return res
+}
+
+fn read_internal(mut rng PRNG, mut buf []u8) {
+	for i in 0 .. buf.len {
+		buf[i] = rng.u8()
+	}
+}