tests/unit/bitops.tcl

   1 # Compare Redis commadns against Tcl implementations of the same commands.
   2 proc count_bits s {
   3     binary scan $s b* bits
   4     string length [regsub -all {0} $bits {}]
   5 }
   6
   7 proc simulate_bit_op {op args} {
   8     set maxlen 0
   9     set j 0
  10     set count [llength $args]
  11     foreach a $args {
  12         binary scan $a b* bits
  13         set b($j) $bits
  14         if {[string length $bits] > $maxlen} {
  15             set maxlen [string length $bits]
  16         }
  17         incr j
  18     }
  19     for {set j 0} {$j < $count} {incr j} {
  20         if {[string length $b($j)] < $maxlen} {
  21             append b($j) [string repeat 0 [expr $maxlen-[string length $b($j)]]]
  22         }
  23     }
  24     set out {}
  25     for {set x 0} {$x < $maxlen} {incr x} {
  26         set bit [string range $b(0) $x $x]
  27         for {set j 1} {$j < $count} {incr j} {
  28             set bit2 [string range $b($j) $x $x]
  29             switch $op {
  30                 and {set bit [expr {$bit & $bit2}]}
  31                 or  {set bit [expr {$bit | $bit2}]}
  32                 xor {set bit [expr {$bit ^ $bit2}]}
  33                 not {set bit [expr {!$bit}]}
  34             }
  35         }
  36         append out $bit
  37     }
  38     binary format b* $out
  39 }
  40
  41 start_server {tags {"bitops"}} {
  42     test {BITCOUNT returns 0 against non existing key} {
  43         r bitcount no-key
  44     } 0
  45
  46     catch {unset num}
  47     foreach vec [list "" "\xaa" "\x00\x00\xff" "foobar"] {
  48         incr num
  49         test "BITCOUNT against test vector #$num" {
  50             r set str $vec
  51             assert {[r bitcount str] == [count_bits $vec]}
  52         }
  53     }
  54
  55     test {BITCOUNT fuzzing} {
  56         for {set j 0} {$j < 100} {incr j} {
  57             set str [randstring 0 3000]
  58             r set str $str
  59             assert {[r bitcount str] == [count_bits $str]}
  60         }
  61     }
  62
  63     test {BITCOUNT with start, end} {
  64         r set s "foobar"
  65         assert_equal [r bitcount s 0 -1] [count_bits "foobar"]
  66         assert_equal [r bitcount s 1 -2] [count_bits "ooba"]
  67         assert_equal [r bitcount s -2 1] [count_bits ""]
  68         assert_equal [r bitcount s 0 1000] [count_bits "foobar"]
  69     }
  70
  71     test {BITCOUNT syntax error #1} {
  72         catch {r bitcount s 0} e
  73         set e
  74     } {ERR*syntax*}
  75
  76     test {BITOP NOT (empty string)} {
  77         r set s ""
  78         r bitop not dest s
  79         r get dest
  80     } {}
  81
  82     test {BITOP NOT (known string)} {
  83         r set s "\xaa\x00\xff\x55"
  84         r bitop not dest s
  85         r get dest
  86     } "\x55\xff\x00\xaa"
  87
  88     test {BITOP where dest and target are the same key} {
  89         r set s "\xaa\x00\xff\x55"
  90         r bitop not s s
  91         r get s
  92     } "\x55\xff\x00\xaa"
  93
  94     test {BITOP AND|OR|XOR don't change the string with single input key} {
  95         r set a "\x01\x02\xff"
  96         r bitop and res1 a
  97         r bitop or  res2 a
  98         r bitop xor res3 a
  99         list [r get res1] [r get res2] [r get res3]
 100     } [list "\x01\x02\xff" "\x01\x02\xff" "\x01\x02\xff"]
 101
 102     test {BITOP missing key is considered a stream of zero} {
 103         r set a "\x01\x02\xff"
 104         r bitop and res1 no-suck-key a
 105         r bitop or  res2 no-suck-key a no-such-key
 106         r bitop xor res3 no-such-key a
 107         list [r get res1] [r get res2] [r get res3]
 108     } [list "\x00\x00\x00" "\x01\x02\xff" "\x01\x02\xff"]
 109
 110     test {BITOP shorter keys are zero-padded to the key with max length} {
 111         r set a "\x01\x02\xff\xff"
 112         r set b "\x01\x02\xff"
 113         r bitop and res1 a b
 114         r bitop or  res2 a b
 115         r bitop xor res3 a b
 116         list [r get res1] [r get res2] [r get res3]
 117     } [list "\x01\x02\xff\x00" "\x01\x02\xff\xff" "\x00\x00\x00\xff"]
 118
 119     foreach op {and or xor} {
 120         test "BITOP $op fuzzing" {
 121             for {set i 0} {$i < 10} {incr i} {
 122                 set vec {}
 123                 set veckeys {}
 124                 set numvec [expr {[randomInt 10]+1}]
 125                 for {set j 0} {$j < $numvec} {incr j} {
 126                     set str [randstring 0 1000]
 127                     lappend vec $str
 128                     lappend veckeys vector_$j
 129                     r set vector_$j $str
 130                 }
 131                 r bitop $op target {*}$veckeys
 132                 assert_equal [r get target] [simulate_bit_op $op {*}$vec]
 133             }
 134         }
 135     }
 136 }