prosody
b193f8a2737e
util/human/units.lua

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util/human/units.lua @ 12482:b193f8a2737e

mod_tls: Do not offer TLS if the connection is considered secure This may be necessary if the session.conn object is not exchanged by the network backend when establishing TLS. In that case, the starttls method will always exist and thus that is not a good indicator for offering TLS. However, the secure bit already tells us that TLS has been established or is not to be established on the connection, so we use that instead.
author Jonas Schäfer <jonas@wielicki.name>
date Fri, 17 Sep 2021 21:18:30 +0200
parent 10903:c5f26f9adb31
child 12573:0f4feaf9ca64
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rev   line source
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1 local math_abs = math.abs;
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2 local math_ceil = math.ceil;
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3 local math_floor = math.floor;
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4 local math_log = math.log;
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5 local math_max = math.max;
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6 local math_min = math.min;
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7 local unpack = table.unpack or unpack; --luacheck: ignore 113
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8
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9 if math_log(10, 10) ~= 1 then
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10 -- Lua 5.1 COMPAT
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11 local log10 = math.log10;
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12 function math_log(n, base)
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13 return log10(n) / log10(base);
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14 end
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15 end
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16
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17 local large = {
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18 "k", 1000,
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19 "M", 1000000,
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20 "G", 1000000000,
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21 "T", 1000000000000,
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22 "P", 1000000000000000,
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23 "E", 1000000000000000000,
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24 "Z", 1000000000000000000000,
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25 "Y", 1000000000000000000000000,
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26 }
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27 local small = {
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28 "m", 0.001,
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29 "μ", 0.000001,
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30 "n", 0.000000001,
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31 "p", 0.000000000001,
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32 "f", 0.000000000000001,
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33 "a", 0.000000000000000001,
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34 "z", 0.000000000000000000001,
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35 "y", 0.000000000000000000000001,
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36 }
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37
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38 local binary = {
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39 "Ki", 2^10,
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40 "Mi", 2^20,
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41 "Gi", 2^30,
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42 "Ti", 2^40,
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43 "Pi", 2^50,
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44 "Ei", 2^60,
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45 "Zi", 2^70,
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46 "Yi", 2^80,
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47 }
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48
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49 local function adjusted_unit(n, b)
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50 local round = math_floor;
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51 local prefixes = large;
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52 local logbase = 1000;
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53 if b == 'b' then
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54 prefixes = binary;
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55 logbase = 1024;
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56 elseif n < 1 then
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57 prefixes = small;
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58 round = math_ceil;
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59 end
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60 local m = math_max(0, math_min(8, round(math_abs(math_log(math_abs(n), logbase)))));
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61 local prefix, multiplier = unpack(prefixes, m * 2-1, m*2);
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62 return multiplier or 1, prefix;
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63 end
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64
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65 -- n: number, the number to format
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66 -- unit: string, the base unit
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67 -- b: optional enum 'b', thousands base
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68 local function format(n, unit, b) --> string
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69 local fmt = "%.3g %s%s";
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70 if n == 0 then
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71 return fmt:format(n, "", unit);
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72 end
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73 local multiplier, prefix = adjusted_unit(n, b);
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74 return fmt:format(n / multiplier, prefix or "", unit);
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75 end
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76
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77 return {
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78 adjust = adjusted_unit;
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79 format = format;
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80 };