blob: 1d23be027196c24d4f94ba6d86e1f336fc0f2485 (
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local zlib = require "ffi-zlib"
local sio = require "pl.stringio"
local concat = table.concat
local function gzip(func, input)
local stream = sio.open(input)
local output = {}
local n = 0
local ok, err = func(function(size)
return stream:read(size)
end, function(data)
n = n + 1
output[n] = data
end, 8192)
if not ok then
return nil, err
end
if n == 0 then
return ""
end
return concat(output, nil, 1, n)
end
local compressor = {}
function compressor.new()
return compressor
end
function compressor.compress(_, data)
return gzip(zlib.deflateGzip, data)
end
function compressor.decompress(_, data)
return gzip(zlib.inflateGzip, data)
end
return compressor
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