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Improve the speed of base64 encode and decode.

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This commit is contained in:
Mark Crane
2015-03-31 18:48:00 +00:00
parent 87763506bb
commit e9fc52436d
2 changed files with 13 additions and 36 deletions
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8
resources/install/scripts/ivr_menu.lua
View File

@@ -209,10 +209,10 @@
dofile(scripts_dir.."/resources/functions/base64.lua");
--get the base64
recording_base64 = row["recording_base64"];
--add the path to filename
ivr_menu_greet_long = recordings_dir.."/"..ivr_menu_greet_long;
--save the recording to the file system
if (string.len(recording_base64) > 32) then
local file = io.open(ivr_menu_greet_long, "w");
@@ -233,10 +233,10 @@
dofile(scripts_dir.."/resources/functions/base64.lua");
--get the base64
recording_base64 = row["recording_base64"];
--add the path to filename
ivr_menu_greet_short = recordings_dir.."/"..ivr_menu_greet_short;
--save the recording to the file system
if (string.len(recording_base64) > 32) then
local file = io.open(ivr_menu_greet_short, "w");

41
resources/install/scripts/resources/functions/base64.lua
View File

@@ -1,36 +1,13 @@
-- Lua 5.1+ base64 v3.0 (c) 2009 by Alex Kloss <alexthkloss@web.de>
-- licensed under the terms of the LGPL2
base64={}
base64 = {}
-- character table string
local b='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
-- encoding
function base64.encode(data)
return ((data:gsub('.', function(x)
local r,b='',x:byte()
for i=8,1,-1 do r=r..(b%2^i-b%2^(i-1)>0 and '1' or '0') end
return r;
end)..'0000'):gsub('%d%d%d?%d?%d?%d?', function(x)
if (#x < 6) then return '' end
local c=0
for i=1,6 do c=c+(x:sub(i,i)=='1' and 2^(6-i) or 0) end
return b:sub(c+1,c+1)
end)..({ '', '==', '=' })[#data%3+1])
-- encode a string and return a base64 string
function base64.encode(s)
local mime = require("mime");
return (mime.b64(s));
end
-- decoding
function base64.decode(data)
data = string.gsub(data, '[^'..b..'=]', '')
return (data:gsub('.', function(x)
if (x == '=') then return '' end
local r,f='',(b:find(x)-1)
for i=6,1,-1 do r=r..(f%2^i-f%2^(i-1)>0 and '1' or '0') end
return r;
end):gsub('%d%d%d?%d?%d?%d?%d?%d?', function(x)
if (#x ~= 8) then return '' end
local c=0
for i=1,8 do c=c+(x:sub(i,i)=='1' and 2^(8-i) or 0) end
return string.char(c)
end))
--decode a base64 string and return a string
function base64.decode(s)
local mime = require("mime");
return (mime.unb64(s));
end