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Functional Base64 prior to cleanup

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This commit is contained in:
Marcos Kirsch 2015-02-07 12:12:48 -06:00
parent 1c709b838b
commit b1f87f3ffa
1 changed files with 31 additions and 2 deletions
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31
b64.lua
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@ -108,6 +108,34 @@ function enc(data)
return result
end
local function toBase64Byte(char)
ascii = string.byte(char, 1)
if ascii >= string.byte('A', 1) and ascii <= string.byte('Z', 1) then
return ascii - string.byte('A', 1)
elseif ascii >= string.byte('a', 1) and ascii <= string.byte('z', 1) then
return ascii - string.byte('a', 1) + 26
elseif ascii >= string.byte('0', 1) and ascii <= string.byte('9', 1) then
return ascii + 4
elseif ascii == string.byte('-', 1) then
return 62
elseif ascii == string.byte('_', 1) then
return 63
elseif ascii == string.byte('=', 1) then
return nil
else
return "ERROR! Char is invalid for Base64 encoding: "..char
end
end
print(toBase64Byte('A'))
print(toBase64Byte('B'))
print(toBase64Byte('C'))
print(toBase64Byte('D'))
print(toBase64Byte('a'))
print(toBase64Byte('b'))
print(toBase64Byte('c'))
print(toBase64Byte('d'))
-- decryption table
local base64bytes = {
['A']=0,
@ -183,7 +211,8 @@ function dec(data)
local chars = {}
local result=""
for dpos=0,string.len(data)-1,4 do
for char=1,4 do chars[char] = base64bytes[(string.sub(data,(dpos+char),(dpos+char)) or "=")] end
-- for char=1,4 do chars[char] = base64bytes[(string.sub(data,(dpos+char),(dpos+char)) or "=")] end
for char=1,4 do chars[char] = toBase64Byte((string.sub(data,(dpos+char),(dpos+char)) or "=")) end
result = string.format(
'%s%s%s%s',
result,