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Made md5.lua use BitOp or Bit32 libraries where available

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This commit is contained in:
Pablo Mayobre 2015-02-07 23:13:01 -03:00
parent 191b026807
commit e7df9d53cf
1 changed files with 153 additions and 145 deletions
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50
md5.lua
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@ -33,15 +33,22 @@ local md5 = {
local floor, abs, max = math.floor, math.abs, math.max local floor, abs, max = math.floor, math.abs, math.max
local char, byte, format, rep, sub = local char, byte, format, rep, sub =
string.char, string.byte, string.format, string.rep, string.sub string.char, string.byte, string.format, string.rep, string.sub
local bit_or, bit_and, bit_not, bit_xor, bit_rshift, bit_lshift
local function check_int(n) if require "bit" or require "bit32" then
local bit = require "bit" or require "bit32"
bit_or, bit_and, bit_not, bit_xor = bit.bor, bit.band, bit.bnot, bit.bxor
bit_rshift, bit_lshift = bit.rshift, bit.lshift
else
local function check_int(n)
-- checking not float -- checking not float
if(n - floor(n) > 0) then if(n - floor(n) > 0) then
error("trying to use bitwise operation on non-integer!") error("trying to use bitwise operation on non-integer!")
end end
end end
local function tbl2number(tbl) local function tbl2number(tbl)
local n = #tbl local n = #tbl
local rslt = 0 local rslt = 0
@ -52,9 +59,9 @@ local function tbl2number(tbl)
end end
return rslt return rslt
end end
local function expand(tbl_m, tbl_n) local function expand(tbl_m, tbl_n)
local big = {} local big = {}
local small = {} local small = {}
if(#tbl_m > #tbl_n) then if(#tbl_m > #tbl_n) then
@ -69,11 +76,11 @@ local function expand(tbl_m, tbl_n)
small[i] = 0 small[i] = 0
end end
end end
local to_bits -- needs to be declared before bit_not local to_bits -- needs to be declared before bit_not
local function bit_not(n) function bit_not(n)
local tbl = to_bits(n) local tbl = to_bits(n)
local size = max(#tbl, 32) local size = max(#tbl, 32)
for i = 1, size do for i = 1, size do
@ -84,10 +91,10 @@ local function bit_not(n)
end end
end end
return tbl2number(tbl) return tbl2number(tbl)
end end
-- defined as local above -- defined as local above
to_bits = function (n) to_bits = function (n)
check_int(n) check_int(n)
if(n < 0) then if(n < 0) then
-- negative -- negative
@ -108,9 +115,9 @@ to_bits = function (n)
end end
return tbl return tbl
end end
local function bit_or(m, n) function bit_or(m, n)
local tbl_m = to_bits(m) local tbl_m = to_bits(m)
local tbl_n = to_bits(n) local tbl_n = to_bits(n)
expand(tbl_m, tbl_n) expand(tbl_m, tbl_n)
@ -126,9 +133,9 @@ local function bit_or(m, n)
end end
return tbl2number(tbl) return tbl2number(tbl)
end end
local function bit_and(m, n) function bit_and(m, n)
local tbl_m = to_bits(m) local tbl_m = to_bits(m)
local tbl_n = to_bits(n) local tbl_n = to_bits(n)
expand(tbl_m, tbl_n) expand(tbl_m, tbl_n)
@ -144,9 +151,9 @@ local function bit_and(m, n)
end end
return tbl2number(tbl) return tbl2number(tbl)
end end
local function bit_xor(m, n) function bit_xor(m, n)
local tbl_m = to_bits(m) local tbl_m = to_bits(m)
local tbl_n = to_bits(n) local tbl_n = to_bits(n)
expand(tbl_m, tbl_n) expand(tbl_m, tbl_n)
@ -162,9 +169,9 @@ local function bit_xor(m, n)
end end
return tbl2number(tbl) return tbl2number(tbl)
end end
local function bit_rshift(n, bits) function bit_rshift(n, bits)
check_int(n) check_int(n)
local high_bit = 0 local high_bit = 0
@ -179,9 +186,9 @@ local function bit_rshift(n, bits)
n = bit_or(floor(n), high_bit) n = bit_or(floor(n), high_bit)
end end
return floor(n) return floor(n)
end end
local function bit_lshift(n, bits) function bit_lshift(n, bits)
check_int(n) check_int(n)
if(n < 0) then if(n < 0) then
@ -193,6 +200,7 @@ local function bit_lshift(n, bits)
n = n*2 n = n*2
end end
return bit_and(n, 4294967295) -- 0xFFFFFFFF return bit_and(n, 4294967295) -- 0xFFFFFFFF
end
end end
-- convert little-endian 32-bit int to a 4-char string -- convert little-endian 32-bit int to a 4-char string