--- /dev/null
+--[[
+/*
+ * Copyright (c) 2007 Tim Kelly/Dialectronics
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to permit
+ * persons to whom the Software is furnished to do so, subject to the
+ * following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT
+ * OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+--]]
+
+--[[
+/*
+ * Copyright (c) 2007 Tim Kelly/Dialectronics
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to permit
+ * persons to whom the Software is furnished to do so, subject to the
+ * following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT
+ * OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+--]]
+
+module("luci.bits", package.seeall);
+
+local hex2bin = {
+ ["0"] = "0000",
+ ["1"] = "0001",
+ ["2"] = "0010",
+ ["3"] = "0011",
+ ["4"] = "0100",
+ ["5"] = "0101",
+ ["6"] = "0110",
+ ["7"] = "0111",
+ ["8"] = "1000",
+ ["9"] = "1001",
+ ["a"] = "1010",
+ ["b"] = "1011",
+ ["c"] = "1100",
+ ["d"] = "1101",
+ ["e"] = "1110",
+ ["f"] = "1111"
+ }
+
+
+
+local bin2hex = {
+ ["0000"] = "0",
+ ["0001"] = "1",
+ ["0010"] = "2",
+ ["0011"] = "3",
+ ["0100"] = "4",
+ ["0101"] = "5",
+ ["0110"] = "6",
+ ["0111"] = "7",
+ ["1000"] = "8",
+ ["1001"] = "9",
+ ["1010"] = "A",
+ ["1011"] = "B",
+ ["1100"] = "C",
+ ["1101"] = "D",
+ ["1110"] = "E",
+ ["1111"] = "F"
+ }
+
+--[[
+local dec2hex = {
+ ["0"] = "0",
+ ["1"] = "1",
+ ["2"] = "2",
+ ["3"] = "3",
+ ["4"] = "4",
+ ["5"] = "5",
+ ["6"] = "6",
+ ["7"] = "7",
+ ["8"] = "8",
+ ["9"] = "9",
+ ["10"] = "A",
+ ["11"] = "B",
+ ["12"] = "C",
+ ["13"] = "D",
+ ["14"] = "E",
+ ["15"] = "F"
+ }
+--]]
+
+
+-- These functions are big-endian and take up to 32 bits
+
+-- Hex2Bin
+-- Bin2Hex
+-- Hex2Dec
+-- Dec2Hex
+-- Bin2Dec
+-- Dec2Bin
+
+
+function Hex2Bin(s)
+
+-- s -> hexadecimal string
+
+local ret = ""
+local i = 0
+
+
+ for i in string.gfind(s, ".") do
+ i = string.lower(i)
+
+ ret = ret..hex2bin[i]
+
+ end
+
+ return ret
+end
+
+
+function Bin2Hex(s)
+
+-- s -> binary string
+
+local l = 0
+local h = ""
+local b = ""
+local rem
+
+l = string.len(s)
+rem = l % 4
+l = l-1
+h = ""
+
+ -- need to prepend zeros to eliminate mod 4
+ if (rem > 0) then
+ s = string.rep("0", 4 - rem)..s
+ end
+
+ for i = 1, l, 4 do
+ b = string.sub(s, i, i+3)
+ h = h..bin2hex[b]
+ end
+
+ return h
+
+end
+
+
+function Bin2Dec(s)
+
+-- s -> binary string
+
+local num = 0
+local ex = string.len(s) - 1
+local l = 0
+
+ l = ex + 1
+ for i = 1, l do
+ b = string.sub(s, i, i)
+ if b == "1" then
+ num = num + 2^ex
+ end
+ ex = ex - 1
+ end
+
+ return string.format("%u", num)
+
+end
+
+
+
+function Dec2Bin(s, num)
+
+-- s -> Base10 string
+-- num -> string length to extend to
+
+local n
+
+ if (num == nil) then
+ n = 0
+ else
+ n = num
+ end
+
+ s = string.format("%x", s)
+
+ s = Hex2Bin(s)
+
+ while string.len(s) < n do
+ s = "0"..s
+ end
+
+ return s
+
+end
+
+
+
+
+function Hex2Dec(s)
+
+-- s -> hexadecimal string
+
+local s = Hex2Bin(s)
+
+ return Bin2Dec(s)
+
+end
+
+
+
+function Dec2Hex(s)
+
+-- s -> Base10 string
+
+ s = string.format("%x", s)
+
+ return s
+
+end
+
+
+
+
+-- These functions are big-endian and will extend to 32 bits
+
+-- BMAnd
+-- BMNAnd
+-- BMOr
+-- BMXOr
+-- BMNot
+
+
+function BMAnd(v, m)
+
+-- v -> hex string to be masked
+-- m -> hex string mask
+
+-- s -> hex string as masked
+
+-- bv -> binary string of v
+-- bm -> binary string mask
+
+local bv = Hex2Bin(v)
+local bm = Hex2Bin(m)
+
+local i = 0
+local s = ""
+
+ while (string.len(bv) < 32) do
+ bv = "0000"..bv
+ end
+
+ while (string.len(bm) < 32) do
+ bm = "0000"..bm
+ end
+
+
+ for i = 1, 32 do
+ cv = string.sub(bv, i, i)
+ cm = string.sub(bm, i, i)
+ if cv == cm then
+ if cv == "1" then
+ s = s.."1"
+ else
+ s = s.."0"
+ end
+ else
+ s = s.."0"
+
+ end
+ end
+
+ return Bin2Hex(s)
+
+end
+
+
+function BMNAnd(v, m)
+
+-- v -> hex string to be masked
+-- m -> hex string mask
+
+-- s -> hex string as masked
+
+-- bv -> binary string of v
+-- bm -> binary string mask
+
+local bv = Hex2Bin(v)
+local bm = Hex2Bin(m)
+
+local i = 0
+local s = ""
+
+ while (string.len(bv) < 32) do
+ bv = "0000"..bv
+ end
+
+ while (string.len(bm) < 32) do
+ bm = "0000"..bm
+ end
+
+
+ for i = 1, 32 do
+ cv = string.sub(bv, i, i)
+ cm = string.sub(bm, i, i)
+ if cv == cm then
+ if cv == "1" then
+ s = s.."0"
+ else
+ s = s.."1"
+ end
+ else
+ s = s.."1"
+
+ end
+ end
+
+ return Bin2Hex(s)
+
+end
+
+
+
+function BMOr(v, m)
+
+-- v -> hex string to be masked
+-- m -> hex string mask
+
+-- s -> hex string as masked
+
+-- bv -> binary string of v
+-- bm -> binary string mask
+
+local bv = Hex2Bin(v)
+local bm = Hex2Bin(m)
+
+local i = 0
+local s = ""
+
+ while (string.len(bv) < 32) do
+ bv = "0000"..bv
+ end
+
+ while (string.len(bm) < 32) do
+ bm = "0000"..bm
+ end
+
+
+ for i = 1, 32 do
+ cv = string.sub(bv, i, i)
+ cm = string.sub(bm, i, i)
+ if cv == "1" then
+ s = s.."1"
+ elseif cm == "1" then
+ s = s.."1"
+ else
+ s = s.."0"
+ end
+ end
+
+ return Bin2Hex(s)
+
+end
+
+function BMXOr(v, m)
+
+-- v -> hex string to be masked
+-- m -> hex string mask
+
+-- s -> hex string as masked
+
+-- bv -> binary string of v
+-- bm -> binary string mask
+
+local bv = Hex2Bin(v)
+local bm = Hex2Bin(m)
+
+local i = 0
+local s = ""
+
+ while (string.len(bv) < 32) do
+ bv = "0000"..bv
+ end
+
+ while (string.len(bm) < 32) do
+ bm = "0000"..bm
+ end
+
+
+ for i = 1, 32 do
+ cv = string.sub(bv, i, i)
+ cm = string.sub(bm, i, i)
+ if cv == "1" then
+ if cm == "0" then
+ s = s.."1"
+ else
+ s = s.."0"
+ end
+ elseif cm == "1" then
+ if cv == "0" then
+ s = s.."1"
+ else
+ s = s.."0"
+ end
+ else
+ -- cv and cm == "0"
+ s = s.."0"
+ end
+ end
+
+ return Bin2Hex(s)
+
+end
+
+
+function BMNot(v, m)
+
+-- v -> hex string to be masked
+-- m -> hex string mask
+
+-- s -> hex string as masked
+
+-- bv -> binary string of v
+-- bm -> binary string mask
+
+local bv = Hex2Bin(v)
+local bm = Hex2Bin(m)
+
+local i = 0
+local s = ""
+
+ while (string.len(bv) < 32) do
+ bv = "0000"..bv
+ end
+
+ while (string.len(bm) < 32) do
+ bm = "0000"..bm
+ end
+
+
+ for i = 1, 32 do
+ cv = string.sub(bv, i, i)
+ cm = string.sub(bm, i, i)
+ if cm == "1" then
+ if cv == "1" then
+ -- turn off
+ s = s.."0"
+ else
+ -- turn on
+ s = s.."1"
+ end
+ else
+ -- leave untouched
+ s = s..cv
+
+ end
+ end
+
+ return Bin2Hex(s)
+
+end
+
+
+-- these functions shift right and left, adding zeros to lost or gained bits
+-- returned values are 32 bits long
+
+-- BShRight(v, nb)
+-- BShLeft(v, nb)
+
+
+function BShRight(v, nb)
+
+-- v -> hexstring value to be shifted
+-- nb -> number of bits to shift to the right
+
+-- s -> binary string of v
+
+local s = Hex2Bin(v)
+
+ while (string.len(s) < 32) do
+ s = "0000"..s
+ end
+
+ s = string.sub(s, 1, 32 - nb)
+
+ while (string.len(s) < 32) do
+ s = "0"..s
+ end
+
+ return Bin2Hex(s)
+
+end
+
+function BShLeft(v, nb)
+
+-- v -> hexstring value to be shifted
+-- nb -> number of bits to shift to the right
+
+-- s -> binary string of v
+
+local s = Hex2Bin(v)
+
+ while (string.len(s) < 32) do
+ s = "0000"..s
+ end
+
+ s = string.sub(s, nb + 1, 32)
+
+ while (string.len(s) < 32) do
+ s = s.."0"
+ end
+
+ return Bin2Hex(s)
+
+end
\ No newline at end of file
projects / project / luci.git / blobdiff