prosody
c0fb8379696e
fallbacks/bit.lua

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fallbacks/bit.lua @ 1284:c0fb8379696e

mod_presence: return true from incoming presence handlers to prevent further processing
author Waqas Hussain <waqas20@gmail.com>
date Tue, 02 Jun 2009 16:22:37 +0500
parent 1137:4a39a6d503d0
child 1522:569d58d21612
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1137
4a39a6d503d0 fallbacks/bit: bit manipulation API (compatible with bitlib for now)
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1
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2 local type = type;
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3 local tonumber = tonumber;
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4 local setmetatable = setmetatable;
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5 local error = error;
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6 local tostring = tostring;
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7 local print = print;
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8
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9 local xor_map = {[0]=0;[1]=1;[2]=2;[3]=3;[4]=4;[5]=5;[6]=6;[7]=7;[8]=8;[9]=9;[10]=10;[11]=11;[12]=12;[13]=13;[14]=14;[15]=15;[16]=1;[17]=0;[18]=3;[19]=2;[20]=5;[21]=4;[22]=7;[23]=6;[24]=9;[25]=8;[26]=11;[27]=10;[28]=13;[29]=12;[30]=15;[31]=14;[32]=2;[33]=3;[34]=0;[35]=1;[36]=6;[37]=7;[38]=4;[39]=5;[40]=10;[41]=11;[42]=8;[43]=9;[44]=14;[45]=15;[46]=12;[47]=13;[48]=3;[49]=2;[50]=1;[51]=0;[52]=7;[53]=6;[54]=5;[55]=4;[56]=11;[57]=10;[58]=9;[59]=8;[60]=15;[61]=14;[62]=13;[63]=12;[64]=4;[65]=5;[66]=6;[67]=7;[68]=0;[69]=1;[70]=2;[71]=3;[72]=12;[73]=13;[74]=14;[75]=15;[76]=8;[77]=9;[78]=10;[79]=11;[80]=5;[81]=4;[82]=7;[83]=6;[84]=1;[85]=0;[86]=3;[87]=2;[88]=13;[89]=12;[90]=15;[91]=14;[92]=9;[93]=8;[94]=11;[95]=10;[96]=6;[97]=7;[98]=4;[99]=5;[100]=2;[101]=3;[102]=0;[103]=1;[104]=14;[105]=15;[106]=12;[107]=13;[108]=10;[109]=11;[110]=8;[111]=9;[112]=7;[113]=6;[114]=5;[115]=4;[116]=3;[117]=2;[118]=1;[119]=0;[120]=15;[121]=14;[122]=13;[123]=12;[124]=11;[125]=10;[126]=9;[127]=8;[128]=8;[129]=9;[130]=10;[131]=11;[132]=12;[133]=13;[134]=14;[135]=15;[136]=0;[137]=1;[138]=2;[139]=3;[140]=4;[141]=5;[142]=6;[143]=7;[144]=9;[145]=8;[146]=11;[147]=10;[148]=13;[149]=12;[150]=15;[151]=14;[152]=1;[153]=0;[154]=3;[155]=2;[156]=5;[157]=4;[158]=7;[159]=6;[160]=10;[161]=11;[162]=8;[163]=9;[164]=14;[165]=15;[166]=12;[167]=13;[168]=2;[169]=3;[170]=0;[171]=1;[172]=6;[173]=7;[174]=4;[175]=5;[176]=11;[177]=10;[178]=9;[179]=8;[180]=15;[181]=14;[182]=13;[183]=12;[184]=3;[185]=2;[186]=1;[187]=0;[188]=7;[189]=6;[190]=5;[191]=4;[192]=12;[193]=13;[194]=14;[195]=15;[196]=8;[197]=9;[198]=10;[199]=11;[200]=4;[201]=5;[202]=6;[203]=7;[204]=0;[205]=1;[206]=2;[207]=3;[208]=13;[209]=12;[210]=15;[211]=14;[212]=9;[213]=8;[214]=11;[215]=10;[216]=5;[217]=4;[218]=7;[219]=6;[220]=1;[221]=0;[222]=3;[223]=2;[224]=14;[225]=15;[226]=12;[227]=13;[228]=10;[229]=11;[230]=8;[231]=9;[232]=6;[233]=7;[234]=4;[235]=5;[236]=2;[237]=3;[238]=0;[239]=1;[240]=15;[241]=14;[242]=13;[243]=12;[244]=11;[245]=10;[246]=9;[247]=8;[248]=7;[249]=6;[250]=5;[251]=4;[252]=3;[253]=2;[254]=1;[255]=0;};
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10 local or_map = {[0]=0;[1]=1;[2]=2;[3]=3;[4]=4;[5]=5;[6]=6;[7]=7;[8]=8;[9]=9;[10]=10;[11]=11;[12]=12;[13]=13;[14]=14;[15]=15;[16]=1;[17]=1;[18]=3;[19]=3;[20]=5;[21]=5;[22]=7;[23]=7;[24]=9;[25]=9;[26]=11;[27]=11;[28]=13;[29]=13;[30]=15;[31]=15;[32]=2;[33]=3;[34]=2;[35]=3;[36]=6;[37]=7;[38]=6;[39]=7;[40]=10;[41]=11;[42]=10;[43]=11;[44]=14;[45]=15;[46]=14;[47]=15;[48]=3;[49]=3;[50]=3;[51]=3;[52]=7;[53]=7;[54]=7;[55]=7;[56]=11;[57]=11;[58]=11;[59]=11;[60]=15;[61]=15;[62]=15;[63]=15;[64]=4;[65]=5;[66]=6;[67]=7;[68]=4;[69]=5;[70]=6;[71]=7;[72]=12;[73]=13;[74]=14;[75]=15;[76]=12;[77]=13;[78]=14;[79]=15;[80]=5;[81]=5;[82]=7;[83]=7;[84]=5;[85]=5;[86]=7;[87]=7;[88]=13;[89]=13;[90]=15;[91]=15;[92]=13;[93]=13;[94]=15;[95]=15;[96]=6;[97]=7;[98]=6;[99]=7;[100]=6;[101]=7;[102]=6;[103]=7;[104]=14;[105]=15;[106]=14;[107]=15;[108]=14;[109]=15;[110]=14;[111]=15;[112]=7;[113]=7;[114]=7;[115]=7;[116]=7;[117]=7;[118]=7;[119]=7;[120]=15;[121]=15;[122]=15;[123]=15;[124]=15;[125]=15;[126]=15;[127]=15;[128]=8;[129]=9;[130]=10;[131]=11;[132]=12;[133]=13;[134]=14;[135]=15;[136]=8;[137]=9;[138]=10;[139]=11;[140]=12;[141]=13;[142]=14;[143]=15;[144]=9;[145]=9;[146]=11;[147]=11;[148]=13;[149]=13;[150]=15;[151]=15;[152]=9;[153]=9;[154]=11;[155]=11;[156]=13;[157]=13;[158]=15;[159]=15;[160]=10;[161]=11;[162]=10;[163]=11;[164]=14;[165]=15;[166]=14;[167]=15;[168]=10;[169]=11;[170]=10;[171]=11;[172]=14;[173]=15;[174]=14;[175]=15;[176]=11;[177]=11;[178]=11;[179]=11;[180]=15;[181]=15;[182]=15;[183]=15;[184]=11;[185]=11;[186]=11;[187]=11;[188]=15;[189]=15;[190]=15;[191]=15;[192]=12;[193]=13;[194]=14;[195]=15;[196]=12;[197]=13;[198]=14;[199]=15;[200]=12;[201]=13;[202]=14;[203]=15;[204]=12;[205]=13;[206]=14;[207]=15;[208]=13;[209]=13;[210]=15;[211]=15;[212]=13;[213]=13;[214]=15;[215]=15;[216]=13;[217]=13;[218]=15;[219]=15;[220]=13;[221]=13;[222]=15;[223]=15;[224]=14;[225]=15;[226]=14;[227]=15;[228]=14;[229]=15;[230]=14;[231]=15;[232]=14;[233]=15;[234]=14;[235]=15;[236]=14;[237]=15;[238]=14;[239]=15;[240]=15;[241]=15;[242]=15;[243]=15;[244]=15;[245]=15;[246]=15;[247]=15;[248]=15;[249]=15;[250]=15;[251]=15;[252]=15;[253]=15;[254]=15;[255]=15;};
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11 local and_map = {[0]=0;[1]=0;[2]=0;[3]=0;[4]=0;[5]=0;[6]=0;[7]=0;[8]=0;[9]=0;[10]=0;[11]=0;[12]=0;[13]=0;[14]=0;[15]=0;[16]=0;[17]=1;[18]=0;[19]=1;[20]=0;[21]=1;[22]=0;[23]=1;[24]=0;[25]=1;[26]=0;[27]=1;[28]=0;[29]=1;[30]=0;[31]=1;[32]=0;[33]=0;[34]=2;[35]=2;[36]=0;[37]=0;[38]=2;[39]=2;[40]=0;[41]=0;[42]=2;[43]=2;[44]=0;[45]=0;[46]=2;[47]=2;[48]=0;[49]=1;[50]=2;[51]=3;[52]=0;[53]=1;[54]=2;[55]=3;[56]=0;[57]=1;[58]=2;[59]=3;[60]=0;[61]=1;[62]=2;[63]=3;[64]=0;[65]=0;[66]=0;[67]=0;[68]=4;[69]=4;[70]=4;[71]=4;[72]=0;[73]=0;[74]=0;[75]=0;[76]=4;[77]=4;[78]=4;[79]=4;[80]=0;[81]=1;[82]=0;[83]=1;[84]=4;[85]=5;[86]=4;[87]=5;[88]=0;[89]=1;[90]=0;[91]=1;[92]=4;[93]=5;[94]=4;[95]=5;[96]=0;[97]=0;[98]=2;[99]=2;[100]=4;[101]=4;[102]=6;[103]=6;[104]=0;[105]=0;[106]=2;[107]=2;[108]=4;[109]=4;[110]=6;[111]=6;[112]=0;[113]=1;[114]=2;[115]=3;[116]=4;[117]=5;[118]=6;[119]=7;[120]=0;[121]=1;[122]=2;[123]=3;[124]=4;[125]=5;[126]=6;[127]=7;[128]=0;[129]=0;[130]=0;[131]=0;[132]=0;[133]=0;[134]=0;[135]=0;[136]=8;[137]=8;[138]=8;[139]=8;[140]=8;[141]=8;[142]=8;[143]=8;[144]=0;[145]=1;[146]=0;[147]=1;[148]=0;[149]=1;[150]=0;[151]=1;[152]=8;[153]=9;[154]=8;[155]=9;[156]=8;[157]=9;[158]=8;[159]=9;[160]=0;[161]=0;[162]=2;[163]=2;[164]=0;[165]=0;[166]=2;[167]=2;[168]=8;[169]=8;[170]=10;[171]=10;[172]=8;[173]=8;[174]=10;[175]=10;[176]=0;[177]=1;[178]=2;[179]=3;[180]=0;[181]=1;[182]=2;[183]=3;[184]=8;[185]=9;[186]=10;[187]=11;[188]=8;[189]=9;[190]=10;[191]=11;[192]=0;[193]=0;[194]=0;[195]=0;[196]=4;[197]=4;[198]=4;[199]=4;[200]=8;[201]=8;[202]=8;[203]=8;[204]=12;[205]=12;[206]=12;[207]=12;[208]=0;[209]=1;[210]=0;[211]=1;[212]=4;[213]=5;[214]=4;[215]=5;[216]=8;[217]=9;[218]=8;[219]=9;[220]=12;[221]=13;[222]=12;[223]=13;[224]=0;[225]=0;[226]=2;[227]=2;[228]=4;[229]=4;[230]=6;[231]=6;[232]=8;[233]=8;[234]=10;[235]=10;[236]=12;[237]=12;[238]=14;[239]=14;[240]=0;[241]=1;[242]=2;[243]=3;[244]=4;[245]=5;[246]=6;[247]=7;[248]=8;[249]=9;[250]=10;[251]=11;[252]=12;[253]=13;[254]=14;[255]=15;}
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12
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13 local not_map = {[0]=15;[1]=14;[2]=13;[3]=12;[4]=11;[5]=10;[6]=9;[7]=8;[8]=7;[9]=6;[10]=5;[11]=4;[12]=3;[13]=2;[14]=1;[15]=0;};
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14 local rshift1_map = {[0]=0;[1]=0;[2]=1;[3]=1;[4]=2;[5]=2;[6]=3;[7]=3;[8]=4;[9]=4;[10]=5;[11]=5;[12]=6;[13]=6;[14]=7;[15]=7;};
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15 local rshift1carry_map = {[0]=0;[1]=8;[2]=0;[3]=8;[4]=0;[5]=8;[6]=0;[7]=8;[8]=0;[9]=8;[10]=0;[11]=8;[12]=0;[13]=8;[14]=0;[15]=8;};
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16 local lshift1_map = {[0]=0;[1]=2;[2]=4;[3]=6;[4]=8;[5]=10;[6]=12;[7]=14;[8]=0;[9]=2;[10]=4;[11]=6;[12]=8;[13]=10;[14]=12;[15]=14;};
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17 local lshift1carry_map = {[0]=0;[1]=0;[2]=0;[3]=0;[4]=0;[5]=0;[6]=0;[7]=0;[8]=1;[9]=1;[10]=1;[11]=1;[12]=1;[13]=1;[14]=1;[15]=1;};
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18 local arshift1carry_map = {[0]=0;[1]=0;[2]=0;[3]=0;[4]=0;[5]=0;[6]=0;[7]=0;[8]=8;[9]=8;[10]=8;[11]=8;[12]=8;[13]=8;[14]=8;[15]=8;};
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19
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20 module "bit"
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21
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22 local bit_mt = {__tostring = function(t) return ("%x%x%x%x%x%x%x%x"):format(t[1],t[2],t[3],t[4],t[5],t[6],t[7],t[8]); end};
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23 local function do_bop(a, b, op)
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24 return setmetatable({
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25 op[a[1]*16+b[1]];
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26 op[a[2]*16+b[2]];
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27 op[a[3]*16+b[3]];
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28 op[a[4]*16+b[4]];
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29 op[a[5]*16+b[5]];
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30 op[a[6]*16+b[6]];
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31 op[a[7]*16+b[7]];
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32 op[a[8]*16+b[8]];
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33 }, bit_mt);
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34 end
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35 local function do_uop(a, op)
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36 return setmetatable({
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37 op[a[1]];
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38 op[a[2]];
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39 op[a[3]];
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40 op[a[4]];
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41 op[a[5]];
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42 op[a[6]];
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43 op[a[7]];
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44 op[a[8]];
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45 }, bit_mt);
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46 end
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47
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48 function bxor(a, b) return do_bop(a, b, xor_map); end
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49 function bor(a, b) return do_bop(a, b, or_map); end
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50 function band(a, b) return do_bop(a, b, and_map); end
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51
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52 function bnot(a) return do_uop(a, not_map); end
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53 local function _rshift1(t)
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54 local carry = 0;
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55 for i=1,8 do
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56 local t_i = rshift1_map[t[i]] + carry;
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57 carry = rshift1carry_map[t[i]];
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58 t[i] = t_i;
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59 end
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60 end
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61 function rshift(a, i)
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62 local t = {a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8]};
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63 for n = 1,i do _rshift1(t); end
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64 return setmetatable(t, bit_mt);
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65 end
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66 local function _arshift1(t)
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67 local carry = arshift1carry_map[t[1]];
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68 for i=1,8 do
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69 local t_i = rshift1_map[t[i]] + carry;
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70 carry = rshift1carry_map[t[i]];
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71 t[i] = t_i;
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72 end
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73 end
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74 function arshift(a, i)
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75 local t = {a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8]};
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76 for n = 1,i do _arshift1(t); end
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77 return setmetatable(t, bit_mt);
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78 end
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79 local function _lshift1(t)
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80 local carry = 0;
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81 for i=8,1,-1 do
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82 local t_i = lshift1_map[t[i]] + carry;
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83 carry = lshift1carry_map[t[i]];
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84 t[i] = t_i;
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85 end
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86 end
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87 function lshift(a, i)
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88 local t = {a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8]};
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89 for n = 1,i do _lshift1(t); end
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90 return setmetatable(t, bit_mt);
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91 end
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92
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93 local function _cast(a)
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94 if type(a) == "number" then a = ("%x"):format(a);
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95 elseif type(a) == "table" then return a;
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96 elseif type(a) ~= "string" then error("string expected, got "..type(a), 2); end
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97 local t = {0,0,0,0,0,0,0,0};
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98 a = "00000000"..a;
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99 a = a:sub(-8);
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100 for i = 1,8 do
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101 t[i] = tonumber(a:sub(i,i), 16) or error("Number format error", 2);
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102 end
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103 return setmetatable(t, bit_mt);
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104 end
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105
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106 local function wrap1(f)
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107 return function(a, ...)
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108 if type(a) ~= "table" then a = _cast(a); end
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109 a = f(a, ...);
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110 a = tonumber(tostring(a), 16);
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111 if a > 0x7fffffff then a = a - 1 - 0xffffffff; end
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112 return a;
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113 end;
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114 end
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115 local function wrap2(f)
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116 return function(a, b, ...)
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117 if type(a) ~= "table" then a = _cast(a); end
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118 if type(b) ~= "table" then b = _cast(b); end
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119 a = f(a, b, ...);
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120 a = tonumber(tostring(a), 16);
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121 if a > 0x7fffffff then a = a - 1 - 0xffffffff; end
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122 return a;
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123 end;
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124 end
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125
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126 bxor = wrap2(bxor);
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127 bor = wrap2(bor);
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128 band = wrap2(band);
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129 bnot = wrap1(bnot);
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130 lshift = wrap1(lshift);
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131 rshift = wrap1(rshift);
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132 arshift = wrap1(arshift);
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133 cast = wrap1(_cast);
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134
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135 bits = 32;
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136
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137 return _M;