sheetjs/js-codepage
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js-codepage/misc/cputils.js.ascii
SheetJS 0121708499 version bump 0.6.0: windows support 
- MakeEncoding.cs program pulls from .NET encodings (tested with Windows 7)
  (outputs stored at dotnet/out and misc/err)
- Many new codepages and improvements
- coverage + coveralls
- better environment handling (h/t @xch89820)
- cpexcel.js for the formats recognized by excel
- decode endian option removed (implicit from codepage definition)
NOTE: utf7 encode can be more space efficient
2014-04-14 13:45:36 -07:00

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/* cputils.js (C) 2013-2014 SheetJS -- http://sheetjs.com */
/*jshint newcap: false */
(function(root, factory){
"use strict";
if(typeof cptable === "undefined") {
if(typeof require !== "undefined"){
var cpt = require('./cptable');
if (typeof module !== 'undefined' && module.exports) module.exports = factory(cpt);
else root.cptable = factory(cpt);
} else throw new Error("cptable not found");
} else cptable = factory(cptable);
}(this, function(cpt){
"use strict";
var magic = {
"1200":"utf16le",
"1201":"utf16be",
"12000":"utf32le",
"12001":"utf32be",
"16969":"utf64le",
"20127":"ascii",
"65000":"utf7",
"65001":"utf8"
};
var sbcs_cache = [874,1250,1251,1252,1253,1254,1255,1256,10000];
var dbcs_cache = [932,936,949,950];
var magic_cache = [65001];
var magic_decode = {};
var magic_encode = {};
var cpecache = {};
var cpdcache = [];
if(typeof Buffer !== 'undefined') {
var sbcs_encode = function(cp) {
var E = cpt[cp].enc;
var EE = new Buffer(256*256);
for(var i = 0; i != 256*256;++i) EE[i] = 0;
Object.keys(E).forEach(function(e) {
EE[e.charCodeAt(0)] = E[e];
});
return function(data, ofmt) {
if(data instanceof Buffer) data = data.toString('utf8');
var out = new Buffer(data.length), i;
if(typeof data === 'string') {
for(i = 0; i != data.length; ++i) out[i] = EE[data.charCodeAt(i)];
} else {
for(i = 0; i != data.length; ++i) out[i] = EE[data[i].charCodeAt(0)];
}
if(!ofmt) return out;
if(ofmt === 'buf') return out;
var arr = [].slice.call(out);
if(ofmt === 'arr') return arr;
return arr.map(function(x) { return String.fromCharCode(x); }).join("");
};
};
var sbcs_decode = function(cp) {
var D = cpt[cp].dec;
var DD = new Buffer(2*256*256);
Object.keys(D).forEach(function(d) {
var w = D[d].charCodeAt(0);
DD[2*d] = w%256; DD[2*d+1] = w>>8;
});
return function(data) {
var out = new Buffer(2*data.length), w, i, j;
if(data instanceof Buffer) {
for(i = 0; i < data.length; i++) {
j = 2*data[i];
out[2*i] = DD[j]; out[2*i+1] = DD[j+1];
}
} else if(typeof data === "string") {
for(i = 0; i < data.length; i++) {
j = 2*data.charCodeAt(i);
out[2*i] = DD[j]; out[2*i+1] = DD[j+1];
}
} else {
for(i = 0; i < data.length; i++) {
j = 2*data[i];
out[2*i] = DD[j]; out[2*i+1] = DD[j+1];
}
}
return out.toString('ucs2');
};
};
var dbcs_encode = function(cp) {
var E = cpt[cp].enc;
var EE = new Buffer(2*256*256);
for(var i = 0; i != 2*256*256;++i) EE[i] = 0;
Object.keys(E).forEach(function(e) {
EE[2*e.charCodeAt(0)] = E[e] & 255;
EE[2*e.charCodeAt(0)+1] = E[e]>>8;
});
return function(data, ofmt) {
if(data instanceof Buffer) data = data.toString('utf8');
var out = new Buffer(2*data.length), i, j, k;
if(typeof data === 'string') {
for(i = k = 0; i != data.length; ++i) {
j = data.charCodeAt(i)*2;
out[k++] = EE[j+1] || EE[j]; if(EE[j+1] > 0) out[k++] = EE[j];
}
out.length = k;
} else {
for(i = k = 0; i != data.length; i++) {
j = data[i].charCodeAt(0)*2;
out[k++] = EE[j+1] || EE[j]; if(EE[j+1] > 0) out[k++] = EE[j];
}
}
if(!ofmt) return out;
if(ofmt === 'buf') return out;
var arr = [].slice.call(out);
if(ofmt === 'arr') return arr;
return arr.map(function(x) { return String.fromCharCode(x); }).join("");
};
};
var dbcs_decode = function(cp) {
var D = cpt[cp].dec;
var DD = new Buffer(2*256*256);
for(var i = 0; i != 256*256;++i) { DD[2*i] = 0xFF; DD[2*i+1] = 0xFD;}
Object.keys(D).forEach(function(d) {
var w = D[d].charCodeAt(0);
DD[2*d] = w%256; DD[2*d+1] = w>>8;
});
return function(data) {
var out = new Buffer(2*data.length), w, i, j, k=0;
if(data instanceof Buffer) {
for(i = 0; i < data.length; i++) {
j = 2*data[i];
if(DD[j]===0xFF && DD[j+1]===0xFD) { j=2*(256*data[i]+data[i+1]); ++i; }
out[k++] = DD[j]; out[k++] = DD[j+1];
}
} else if(typeof data === "string") {
for(i = 0; i < data.length; i++) {
j = 2*data.charCodeAt(i);
if(DD[j]===0xFF && DD[j+1]===0xFD) { j=2*(256*data.charCodeAt(i)+data.charCodeAt(i+1)); ++i; }
out[k++] = DD[j]; out[k++] = DD[j+1];
}
} else {
for(i = 0; i < data.length; i++) {
j = 2*data[i];
if(DD[j]===0xFF && DD[j+1]===0xFD) { j=2*(256*data[i]+data[i+1]); ++i; }
out[k++] = DD[j]; out[k++] = DD[j+1];
}
}
out.length = k;
return out.toString('ucs2');
};
};
magic_decode[65001] = function(data) {
var out = new Buffer(2*data.length), w, i, j = 1, k = 0, ww;
for(i = 0; i < data.length; i+=j) {
j = 1;
if(data[i] < 128) w = data[i];
else if(data[i] < 224) { w = (data[i]&31)*64+(data[i+1]&63); j=2; }
else { w=(data[i]&15)*4096+(data[i+1]&63)*64+(data[i+2]&63); j=3; }
out[k++] = w%256; out[k++] = w>>8;
}
out.length = k;
return out.toString('ucs2');
};
}
var encache = function(cp) {
if(typeof Buffer !== 'undefined') {
sbcs_cache.forEach(function(s) {
cpdcache[s] = sbcs_decode(s);
cpecache[s] = sbcs_encode(s);
});
dbcs_cache.forEach(function(s) {
cpdcache[s] = dbcs_decode(s);
cpecache[s] = dbcs_encode(s);
});
magic_cache.forEach(function(s) {
if(magic_decode[s]) cpdcache[s] = magic_decode[s];
if(magic_encode[s]) cpecache[s] = magic_encode[s];
});
}
};
var cp_decache = function(cp) { delete cpdcache[cp]; delete cpecache[cp]; };
var decache = function() {
if(typeof Buffer !== 'undefined') {
sbcs_cache.forEach(cp_decache);
dbcs_cache.forEach(cp_decache);
magic_cache.forEach(cp_decache);
}
};
var cache = {
encache: encache,
decache: decache,
sbcs: sbcs_cache,
dbcs: dbcs_cache
};
encache();
var BM = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var SetD = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'(),-./:?";
var encode = function(cp, data, ofmt) {
var F; if((F=cpecache[cp])) return F(data, ofmt);
if(typeof Buffer !== 'undefined' && data instanceof Buffer) data = data.toString('utf8');
var out = typeof Buffer !== 'undefined' ? new Buffer(4*data.length) : [], w, i, j = 0, c, tt;
var C = cpt[cp], E, M;
if(C && (E=C.enc)) for(i = 0; i != data.length; ++i, ++j) {
w = E[data[i]];
out[j] = w % 256;
if(w > 255) {
out[j] = (w/256)|0;
out[++j] = w%256;
}
}
else if((M=magic[cp])) switch(M) {
case "utf8":
if(typeof Buffer !== 'undefined' && typeof data === "string") { out = new Buffer(data, M); j = out.length; break; }
for(i = 0; i != data.length; ++i, ++j) {
w = data[i].charCodeAt(0);
if(w <= 0x007F) out[j] = w;
else if(w <= 0x07FF) {
out[j] = 192 + (w >> 6);
out[++j] = 128 + (w % 64);
} else {
out[j] = 224 + (w >> 12);
out[++j] = 128 + ((w >> 6) % 64);
out[++j] = 128 + (w % 64);
}
}
break;
case "ascii":
if(typeof Buffer !== 'undefined' && typeof data === "string") { out = new Buffer(data, M); j = out.length; break; }
for(i = 0; i != data.length; ++i, ++j) {
w = data[i].charCodeAt(0);
if(w <= 0x007F) out[j] = w;
else throw new Error("bad ascii " + w);
}
break;
case "utf16le": /* TODO: surrogate pairs */
if(typeof Buffer !== 'undefined' && typeof data === "string") { out = new Buffer(data, M); j = out.length; break; }
for(i = 0; i != data.length; ++i) {
w = data[i].charCodeAt(0);
out[j++] = w % 256;
out[j++] = w>>8;
}
break;
case "utf16be":
for(i = 0; i != data.length; ++i) {
w = data[i].charCodeAt(0);
out[j++] = w>>8;
out[j++] = w % 256;
}
break;
case "utf32le":
for(i = 0; i != data.length; ++i) {
w = data[i].charCodeAt(0);
out[j++] = w % 256; w >>= 8;
out[j++] = w % 256; w >>= 8;
out[j++] = w % 256; w >>= 8;
out[j++] = w % 256;
}
break;
case "utf32be":
for(i = 0; i != data.length; ++i) {
w = data[i].charCodeAt(0);
out[j+3] = w % 256; w >>= 8;
out[j+2] = w % 256; w >>= 8;
out[j+1] = w % 256; w >>= 8;
out[j] = w % 256; w >>= 8;
j+=4;
}
break;
case "utf7":
for(i = 0; i != data.length; i++) {
c = data[i];
if(c === "+") { out[j++] = 0x2b; out[j++] = 0x2d; continue; }
if(SetD.indexOf(c) > -1) { out[j++] = c.charCodeAt(0); continue; }
tt = encode(1201, c);
out[j++] = 0x2b;
out[j++] = BM.charCodeAt(tt[0]>>2);
out[j++] = BM.charCodeAt(((tt[0]&0x03)<<4) + ((tt[1]||0)>>4));
out[j++] = BM.charCodeAt(((tt[1]&0x0F)<<2) + ((tt[2]||0)>>6));
out[j++] = 0x2d;
}
break;
default: throw new Error("Unsupported magic: " + cp + " " + magic[cp]);
}
else throw new Error("Unrecognized CP: " + cp);
out.length = j;
if(typeof Buffer === 'undefined') return (ofmt == 'str') ? out.map(function(x) { return String.fromCharCode(x); }).join("") : out;
if(!ofmt) return out;
if(ofmt === 'buf') return out;
var arr = [].slice.call(out);
if(ofmt === 'arr') return arr;
return arr.map(function(x) { return String.fromCharCode(x); }).join("");
};
var decode = function(cp, data) {
var F; if((F=cpdcache[cp])) return F(data);
var out = new Array(data.length), w, i, j = 1, k = 0;
var C = cpt[cp], D, M;
if(C && (D=C.dec)) {
if(typeof data === "string") data = data.split("").map(function(x){ return x.charCodeAt(0); });
for(i = 0; i < data.length; i+=j) {
j = 2;
w = D[data[i]*256 + data[i+1]];
if(!w) {
j = 1;
w = D[data[i]];
}
if(!w) throw new Error('Unrecognized code: ' + data[i] + ' ' + data[i+j-1] + ' ' + i + ' ' + j + ' ' + D[data[i]]);
out[k++] = w;
}
}
else if((M=magic[cp])) switch(M) {
case "utf8":
for(i = 0; i < data.length; i+=j) {
j = 1;
if(data[i] < 128) w = data[i];
else if(data[i] < 224) { w = (data[i]&31)*64+(data[i+1]&63); j=2; }
else { w=(data[i]&15)*4096+(data[i+1]&63)*64+(data[i+2]&63); j=3; }
out[k++] = String.fromCharCode(w);
}
break;
case "ascii":
if(typeof Buffer !== 'undefined' && data instanceof Buffer) return data.toString(M);
for(i = 0; i < data.length; i++) out[i] = String.fromCharCode(data[i]);
k = data.length; break;
case "utf16le":
if(typeof Buffer !== 'undefined' && data instanceof Buffer) return data.toString(M);
j = 2;
for(i = 0; i < data.length; i+=j) {
out[k++] = String.fromCharCode(256*data[i+1] + data[i]);
}
break;
case "utf16be":
j = 2;
for(i = 0; i < data.length; i+=j) {
out[k++] = String.fromCharCode(256*data[i] + data[i+1]);
}
break;
case "utf32le":
j = 4;
for(i = 0; i < data.length; i+=j) {
out[k++] = String.fromCharCode((data[i+3]<<24) + (data[i+2]<<16) + (data[i+1]<<8) + (data[i]));
}
break;
case "utf32be":
j = 4;
for(i = 0; i < data.length; i+=j) {
out[k++] = String.fromCharCode((data[i]<<24) + (data[i+1]<<16) + (data[i+2]<<8) + (data[i+3]));
}
break;
case "utf7":
for(i = 0; i < data.length; i+=j) {
if(data[i] !== 0x2b) { j=1; out[k++] = String.fromCharCode(data[i]); continue; }
j=1;
if(data[i+1] === 0x2d) { j = 2; out[k++] = "+"; continue; }
while(String.fromCharCode(data[i+j]).match(/[A-Za-z0-9+\/]/)) j++;
var dash = 0;
if(data[i+j] === 0x2d) { ++j; dash=1; }
var tt = [];
var o64;
var c1, c2, c3;
var e1, e2, e3, e4;
for(var l = 1; l < j - dash;) {
e1 = BM.indexOf(String.fromCharCode(data[i+l++]));
e2 = BM.indexOf(String.fromCharCode(data[i+l++]));
c1 = e1 << 2 | e2 >> 4;
tt.push(c1);
e3 = BM.indexOf(String.fromCharCode(data[i+l++]));
if(e3 === -1) break;
c2 = (e2 & 15) << 4 | e3 >> 2;
tt.push(c2);
e4 = BM.indexOf(String.fromCharCode(data[i+l++]));
if(e4 === -1) break;
c3 = (e3 & 3) << 6 | e4;
if(e4 != 64) tt.push(c3);
}
if(tt.length % 2 == 1) tt.length--;
o64 = decode(1201, tt);
for(var l = 0; l < o64.length; ++l) out[k++] = o64[l];
}
break;
default: throw new Error("Unsupported magic: " + cp + " " + magic[cp]);
}
else throw new Error("Unrecognized CP: " + cp);
out.length = k;
return out.join("");
};
var hascp = function(cp) { return cpt[cp] || magic[cp]; };
cpt.utils = { decode: decode, encode: encode, hascp: hascp, magic: magic, cache:cache };
return cpt;
}));
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