LZW compression: Difference between revisions
Content added Content deleted
m (→{{header|Haskell}}: make the types more general) |
m (Optimized Lua decompress using table.concat. On 1.2mb test data, ~44x faster. 58.8s to 1.3s) |
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| Line 2,908: | Line 2,908: | ||
local function decompress(compressed) -- table |
local function decompress(compressed) -- table |
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local dictionary, dictSize, entry, result, w, k = {}, |
local dictionary, dictSize, entry, result, w, k = {}, 0, "", {}, "" |
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for i = 0, 255 do |
for i = 0, 255 do |
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dictionary[i] = string.char(i) |
dictionary[i] = string.char(i) |
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| Line 2,921: | Line 2,921: | ||
return nil, i |
return nil, i |
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end |
end |
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result |
table.insert(result, entry) |
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dictionary[dictSize] = w .. string.sub(entry, 1, 1) |
dictionary[dictSize] = w .. string.sub(entry, 1, 1) |
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dictSize = dictSize + 1 |
dictSize = dictSize + 1 |
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w = entry |
w = entry |
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end |
end |
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return result |
return table.concat(result) |
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end |
end |
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