Data commit

Task/Variable-length-quantity/Sidef/variable-length-quantity.sidef

@@ -0,0 +1,27 @@
+func vlq_encode(num) {
+    var t = (0x7F & num)
+    var str = t.chr
+    while (num >>= 7) {
+       t = (0x7F & num)
+       str += chr(0x80 | t)
+    }
+    str.reverse
+}
+
+func vlq_decode(str) {
+    var num = ''
+    str.each_byte { |b|
+        num += ('%07b' % (b & 0x7F))
+    }
+    Num(num, 2)
+}
+
+var tests = [0,   0xa,   123,   254,   255,   256,
+             257, 65534, 65535, 65536, 65537, 0x1fffff,
+             0x200000]
+
+tests.each { |t|
+    var vlq = vlq_encode(t)
+    printf("%8s %12s %8s\n", t,
+        vlq.bytes.join(':', { "%02X" % _ }), vlq_decode(vlq))
+}