File

util.dbuffer: dynamic string buffer Similar to util.ringbuffer (and shares almost identical API). Differences: - size limit is optional and dynamic - does not allocate a fixed buffer of max_size bytes - focus on simply storing references to existing string objects where possible, avoiding unnecessary allocations - references are still stored in a ring buffer to enable use as a fast FIFO Optional second parameter to new() provides the number of ring buffer segments. On Lua 5.2 on my laptop, a segment is ~19 bytes. If the ring buffer fills up, the next write will compact all strings into a single item.

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−local s_char = string.char;
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−local s_format = string.format;
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−local s_gsub = string.gsub;
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−local s_lower = string.lower;
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−
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−local char_to_hex = {};
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−local hex_to_char = {};
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−
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−do
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−	local char, hex;
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−	for i = 0,255 do
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−		char, hex = s_char(i), s_format("%02x", i);
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−		char_to_hex[char] = hex;
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−		hex_to_char[hex] = char;
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−	end
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−end
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−
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−local function to(s)
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−	return (s_gsub(s, ".", char_to_hex));
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−end
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−
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−local function from(s)
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−	return (s_gsub(s_lower(s), "%X*(%x%x)%X*", hex_to_char));
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−end
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−
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−return { to = to, from = from }