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--[[--------------------------------------------------------------------
test_number.lua
Test for Lua-based number conversion functions in ldump.lua
This file is part of Yueliang.
Copyright (c) 2005-2006 Kein-Hong Man <khman@users.sf.net>
The COPYRIGHT file describes the conditions
under which this software may be distributed.
See the ChangeLog for more information.
----------------------------------------------------------------------]]
--[[--------------------------------------------------------------------
-- Notes:
-- * luaU:from_int(value) does not have overflow checks, but this
-- can presumably be put in for debugging purposes.
-- * TODO: double conversion does not support denormals or NaNs
-- * apparently 0/0 == 0/0 is false (Lua 5.0.2 on Win32/Mingw), so
-- can't use to check for NaNs
----------------------------------------------------------------------]]
require("../ldump")
------------------------------------------------------------------------
-- convert hex string representation to a byte string
-- * must have an even number of hex digits
------------------------------------------------------------------------
local function from_hexstring(s)
local bs = ""
for i = 1, string.len(s), 2 do
local asc = tonumber(string.sub(s, i, i + 1), 16)
bs = bs..string.char(asc)
end
return bs
end
------------------------------------------------------------------------
-- convert a byte string to a hex string representation
-- * big-endian, easier to grok
------------------------------------------------------------------------
local function to_hexstring(s)
local hs = ""
for i = string.len(s), 1, -1 do
local c = string.byte(string.sub(s, i, i))
hs = hs..string.format("%02X", c)
end
return hs
end
------------------------------------------------------------------------
-- tests for 32-bit signed/unsigned integer
------------------------------------------------------------------------
local function test_int(value, expected)
local actual = to_hexstring(luaU:from_int(value))
if not expected or expected == "" then
print(value..": "..actual)
elseif actual ~= expected then
print(value..": FAILED!\n"..
"Converted: "..actual.."\n"..
"Expected: "..expected)
return true
end
return false
end
local table_int = {
["0"] = "00000000",
["1"] = "00000001",
["256"] = "00000100",
["-256"] = "FFFFFF00",
["-1"] = "FFFFFFFF",
["2147483647"] = "7FFFFFFF", -- LONG_MAX
["-2147483648"] = "80000000", -- LONG_MIN
["4294967295"] = "FFFFFFFF", -- ULONG_MAX
--[""] = "",
}
local success = true
print("Testing luaU:from_int():")
for i, v in pairs(table_int) do
local test_value = tonumber(i)
local expected = v
if test_int(test_value, expected) then
success = false
end
end
if success then
print("All test numbers passed okay.\n")
else
print("There were one or more failures.\n")
end
------------------------------------------------------------------------
-- tests for IEEE 754 64-bit double
------------------------------------------------------------------------
local function test_double(value, expected)
local actual = to_hexstring(luaU:from_double(value))
if not expected or expected == "" then
print(value..": "..actual)
elseif actual ~= expected then
print(value..": FAILED!\n"..
"Converted: "..actual.."\n"..
"Expected: "..expected)
return true
end
return false
end
-- special values, see testing loop for actual lookup
Infinity = 1/0
Infinity_neg = -1/0
-- can't seem to do a comparison test with NaN, so leave them
-- (need to check the IEEE standard on this...)
NaN = 0/0
NaN_neg = -0/0
--["NaN"] = "", -- 7FF8000000000000 (djgpp)
--["NaN_neg"] = "", -- FFF8000000000000 (djgpp)
local table_double = {
-- 0 for exponent, 0 for mantissa
["0"] = "0000000000000000",
-- 3FF is bias of 1023, so (-1)^0 * (1+0) * 2^0
["1"] = "3FF0000000000000",
-- BFF has sign bit on, so (-1)^1 * (1+0) * 2^0
["-1"] = "BFF0000000000000",
-- 3FC is bias of 1020, so (-1)^0 * (1+0) * 2^-3
["0.125"] = "3FC0000000000000",
["0.250"] = "3FD0000000000000",
["0.500"] = "3FE0000000000000",
-- 40F is bias of 1039, so (-1)^0 * (1+0) * 2^16
["65536"] = "40F0000000000000",
-- 7FF is bias of 2047, 0 for mantissa
["Infinity"] = "7FF0000000000000",
-- FFF has sign bit on, 0 for mantissa
["Infinity_neg"] = "FFF0000000000000",
-- DBL_MIN, exponent=001 ( 1), mantissa=0000000000000
["2.2250738585072014e-308"] = "0010000000000000",
-- DBL_MAX, exponent=7FE (2046), mantissa=FFFFFFFFFFFFF
["1.7976931348623157e+308"] = "7FEFFFFFFFFFFFFF",
--[[
-- * the following is for float numbers only *
-- FLT_MIN, exponent=01 ( 1), mantissa=000000
-- altervative value for FLT_MIN: 1.17549435e-38F
["1.1754943508222875081e-38"] = "00800000",
-- FLT_MAX, exponent=FE (254), mantissa=7FFFFF
-- altervative value for FLT_MAX: 3.402823466e+38F
["3.4028234663852885982e+38"] = "7F7FFFFF",
--]]
--[""] = "",
}
local success = true
print("Testing luaU:from_double():")
for i, v in pairs(table_double) do
local test_value
if not string.find(i, "%d") then
test_value = _G[i]
else
test_value = tonumber(i)
end
local expected = v
if test_double(test_value, expected) then
success = false
end
end
if success then
print("All test numbers passed okay.\n")
else
print("There were one or more failures.\n")
end
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