86 lines
2.2 KiB
Lua
86 lines
2.2 KiB
Lua
function encodeBase64(source_str)
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local b64chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
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local s64 = ''
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local str = source_str
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while #str > 0 do
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local bytes_num = 0
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local buf = 0
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for byte_cnt=1,3 do
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buf = (buf * 256)
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if #str > 0 then
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buf = buf + string.byte(str, 1, 1)
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str = string.sub(str, 2)
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bytes_num = bytes_num + 1
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end
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end
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for group_cnt=1,(bytes_num+1) do
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local b64char = math.fmod(math.floor(buf/262144), 64) + 1
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s64 = s64 .. string.sub(b64chars, b64char, b64char)
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buf = buf * 64
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end
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for fill_cnt=1,(3-bytes_num) do
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s64 = s64 .. '='
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end
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end
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return s64
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end
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function decodeBase64(str64)
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local b64chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
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local temp={}
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for i=1,64 do
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temp[string.sub(b64chars,i,i)] = i
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end
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temp['=']=0
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local str=""
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for i=1,#str64,4 do
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if i>#str64 then
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break
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end
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local data = 0
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local str_count=0
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for j=0,3 do
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local str1=string.sub(str64,i+j,i+j)
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if not temp[str1] then
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return
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end
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if temp[str1] < 1 then
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data = data * 64
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else
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data = data * 64 + temp[str1]-1
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str_count = str_count + 1
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end
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end
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for j=16,0,-8 do
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if str_count > 0 then
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str=str..string.char(math.floor(data/math.pow(2,j)))
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data=math.fmod(data,math.pow(2,j))
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str_count = str_count - 1
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end
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end
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end
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local last = tonumber(string.byte(str, string.len(str), string.len(str)))
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if last == 0 then
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str = string.sub(str, 1, string.len(str) - 1)
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end
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return str
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end
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--url解码
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local function decodeURI(s)
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s = string.gsub(s, '%%(%x%x)', function(h) return string.char(tonumber(h, 16)) end)
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return s
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end
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--url加码
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local function encodeURI(s)
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s = string.gsub(s, "([^%w%.%- ])", function(c) return string.format("%%%02X", string.byte(c)) end)
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return string.gsub(s, " ", "+")
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end |