cputils.mjs

/*! cputils.js (C) 2013-present SheetJS -- http://sheetjs.com */
/* vim: set ft=javascript: */
var cpt = cptable;
  /*global module, Buffer */
  var magic/*:{[id:CPIndex]:string}*/ = {
    "1200":"utf16le",
    "1201":"utf16be",
    "12000":"utf32le",
    "12001":"utf32be",
    "16969":"utf64le",
    "20127":"ascii",
    "65000":"utf7",
    "65001":"utf8"
  };

  var sbcs_cache/*:Array<number>*/ = [874,1250,1251,1252,1253,1254,1255,1256,10000];
  var dbcs_cache/*:Array<number>*/ = [932,936,949,950];
  var magic_cache/*:Array<number>*/ = [65001];
  var magic_decode/*:DecoderMap*/ = {};
  var magic_encode/*:EncoderMap*/ = {};
  var cpdcache/*:DecoderMap*/ = {};
  var cpecache/*:EncoderMap*/ = {};

  var sfcc = function sfcc(x/*:number*/)/*:string*/ { return String.fromCharCode(x); };
  var cca = function cca(x/*:string*/)/*:number*/ { return x.charCodeAt(0); };

  var has_buf/*:boolean*/ = (typeof Buffer !== 'undefined');
  var Buffer_from = function(){};
  if(has_buf) {
    var nbfs = !Buffer.from;
    if(!nbfs) try { Buffer.from("foo", "utf8"); } catch(e) { nbfs = true; }
    Buffer_from = nbfs ? function(buf, enc) { return (enc) ? new Buffer(buf, enc) : new Buffer(buf); } : Buffer.from.bind(Buffer);
    // $FlowIgnore
    if(!Buffer.allocUnsafe) Buffer.allocUnsafe = function(n) { return new Buffer(n); };

    var mdl = 1024, mdb = Buffer.allocUnsafe(mdl);
    var make_EE = function make_EE(E/*:EMap*/)/*:Buffer*/{
      var EE = Buffer.allocUnsafe(65536);
      for(var i = 0; i < 65536;++i) EE[i] = 0;
      var keys/*:Array<string>*/ = Object.keys(E), len = keys.length;
      for(var ee = 0, e = keys[ee]; ee < len; ++ee) {
        if(!(e = keys[ee])) continue;
        EE[e.charCodeAt(0)] = E[e];
      }
      return EE;
    };
    var sbcs_encode = function make_sbcs_encode(cp/*:CPIndex*/)/*:Encoder*/ {
      var EE/*:Buffer*/ = make_EE(cpt[cp].enc);
      return function sbcs_e(data/*:StrData*/, ofmt/*:?string*/) {
        var len = data.length;
        var out/*:Buffer*/, i=0, j=0, D=0, w=0;
        if(typeof data === 'string') {
          out = Buffer.allocUnsafe(len);
          for(i = 0; i < len; ++i) out[i] = EE[data.charCodeAt(i)];
        } else if(/*:: data instanceof Buffer && */Buffer.isBuffer(data)) {
          out = Buffer.allocUnsafe(2*len);
          j = 0;
          for(i = 0; i < len; ++i) {
            D = data[i];
            if(D < 128) out[j++] = EE[D];
            else if(D < 224) { out[j++] = EE[((D&31)<<6)+(data[i+1]&63)]; ++i; }
            else if(D < 240) { out[j++] = EE[((D&15)<<12)+((data[i+1]&63)<<6)+(data[i+2]&63)]; i+=2; }
            else {
              w = ((D&7)<<18)+((data[i+1]&63)<<12)+((data[i+2]&63)<<6)+(data[i+3]&63); i+=3;
              if(w < 65536) out[j++] = EE[w];
              else { w -= 65536; out[j++] = EE[0xD800 + ((w>>10)&1023)]; out[j++] = EE[0xDC00 + (w&1023)]; }
            }
          }
          out = out.slice(0,j);
        } else {
          out = Buffer.allocUnsafe(len);
          for(i = 0; i < len; ++i) out[i] = EE[/*::(*/data[i]/*:: :any)*/.charCodeAt(0)];
        }
        if(!ofmt || ofmt === 'buf') return out;
        if(ofmt !== 'arr') return out.toString('binary');
        return [].slice.call(out);
      };
    };
    var sbcs_decode = function make_sbcs_decode(cp/*:CPIndex*/)/*:Decoder*/ {
      var D/*:DMap*/ = cpt[cp].dec;
      var DD = Buffer.allocUnsafe(131072), d=0, c="";
      for(d=0;d<D.length;++d) {
        if(!(c=D[d])) continue;
        var w = c.charCodeAt(0);
        DD[2*d] = w&255; DD[2*d+1] = w>>8;
      }
      return function sbcs_d(data/*:Data*/)/*:string*/ {
        var len = data.length, i=0, j=0;
        if(2 * len > mdl) { mdl = 2 * len; mdb = Buffer.allocUnsafe(mdl); }
        if(/*::data instanceof Buffer && */Buffer.isBuffer(data)) {
          for(i = 0; i < len; i++) {
            j = 2*data[i];
            mdb[2*i] = DD[j]; mdb[2*i+1] = DD[j+1];
          }
        } else if(typeof data === "string") {
          for(i = 0; i < len; i++) {
            j = 2*data.charCodeAt(i);
            mdb[2*i] = DD[j]; mdb[2*i+1] = DD[j+1];
          }
        } else {
          for(i = 0; i < len; i++) {
            j = 2*data[i];
            mdb[2*i] = DD[j]; mdb[2*i+1] = DD[j+1];
          }
        }
        return mdb.slice(0, 2 * len).toString('ucs2');
      };
    };
    var dbcs_encode = function make_dbcs_encode(cp/*:CPIndex*/)/*:Encoder*/ {
      var E/*:EMap*/ = cpt[cp].enc;
      var EE = Buffer.allocUnsafe(131072);
      for(var i = 0; i < 131072; ++i) EE[i] = 0;
      var keys = Object.keys(E);
      for(var ee = 0, e = keys[ee]; ee < keys.length; ++ee) {
        if(!(e = keys[ee])) continue;
        var f = e.charCodeAt(0);
        EE[2*f] = E[e] & 255; EE[2*f+1] = E[e]>>8;
      }
      return function dbcs_e(data/*:StrData*/, ofmt/*:?string*/)/*:any*/ {
        var len = data.length, out = Buffer.allocUnsafe(2*len), i=0, j=0, jj=0, k=0, D=0;
        if(typeof data === 'string') {
          for(i = k = 0; i < len; ++i) {
            j = data.charCodeAt(i)*2;
            out[k++] = EE[j+1] || EE[j]; if(EE[j+1] > 0) out[k++] = EE[j];
          }
          out = out.slice(0,k);
        } else if(/*::data instanceof Buffer && */Buffer.isBuffer(data)) {
          for(i = k = 0; i < len; ++i) {
            D = data[i];
            if(D < 128) j = D;
            else if(D < 224) { j = ((D&31)<<6)+(data[i+1]&63); ++i; }
            else if(D < 240) { j = ((D&15)<<12)+((data[i+1]&63)<<6)+(data[i+2]&63); i+=2; }
            else { j = ((D&7)<<18)+((data[i+1]&63)<<12)+((data[i+2]&63)<<6)+(data[i+3]&63); i+=3; }
            if(j<65536) { j*=2; out[k++] = EE[j+1] || EE[j]; if(EE[j+1] > 0) out[k++] = EE[j]; }
            else { jj = j-65536;
              j=2*(0xD800 + ((jj>>10)&1023)); out[k++] = EE[j+1] || EE[j]; if(EE[j+1] > 0) out[k++] = EE[j];
              j=2*(0xDC00 + (jj&1023)); out[k++] = EE[j+1] || EE[j]; if(EE[j+1] > 0) out[k++] = EE[j];
            }
          }
          out = out.slice(0,k);
        } else {
          for(i = k = 0; i < len; i++) {
            j = /*::(*/data[i]/*:: :any)*/.charCodeAt(0)*2;
            out[k++] = EE[j+1] || EE[j]; if(EE[j+1] > 0) out[k++] = EE[j];
          }
        }
        if(!ofmt || ofmt === 'buf') return out;
        if(ofmt !== 'arr') return out.toString('binary');
        return [].slice.call(out);
      };
    };
    var dbcs_decode = function make_dbcs_decode(cp/*:CPIndex*/)/*:Decoder*/ {
      var D/*:DMap*/ = cpt[cp].dec;
      var DD = Buffer.allocUnsafe(131072), d=0, c, w=0, j=0, i=0;
      for(i = 0; i < 65536; ++i) { DD[2*i] = 0xFF; DD[2*i+1] = 0xFD;}
      for(d = 0; d < D.length; ++d) {
        if(!(c=D[d])) continue;
        w = c.charCodeAt(0);
        j = 2*d;
        DD[j] = w&255; DD[j+1] = w>>8;
      }
      return function dbcs_d(data/*:Data*/)/*:string*/ {
        var len = data.length, out = Buffer.allocUnsafe(2*len), i=0, j=0, k=0;
        if(/*::data instanceof Buffer && */Buffer.isBuffer(data)) {
          for(i = 0; i < len; i++) {
            j = 2*data[i];
            if(DD[j]===0xFF && DD[j+1]===0xFD) { j=2*((data[i]<<8)+data[i+1]); ++i; }
            out[k++] = DD[j]; out[k++] = DD[j+1];
          }
        } else if(typeof data === "string") {
          for(i = 0; i < len; i++) {
            j = 2*data.charCodeAt(i);
            if(DD[j]===0xFF && DD[j+1]===0xFD) { j=2*((data.charCodeAt(i)<<8)+data.charCodeAt(i+1)); ++i; }
            out[k++] = DD[j]; out[k++] = DD[j+1];
          }
        } else {
          for(i = 0; i < len; i++) {
            j = 2*data[i];
            if(DD[j]===0xFF && DD[j+1]===0xFD) { j=2*((data[i]<<8)+data[i+1]); ++i; }
            out[k++] = DD[j]; out[k++] = DD[j+1];
          }
        }
        return out.slice(0,k).toString('ucs2');
      };
    };
    magic_decode[65001] = function utf8_d(data/*:Data*/)/*:string*/ {
      if(typeof data === "string") return utf8_d(data.split("").map(cca));
      var len = data.length, w = 0, ww = 0;
      if(4 * len > mdl) { mdl = 4 * len; mdb = Buffer.allocUnsafe(mdl); }
      var i = 0;
      if(len >= 3 && data[0] == 0xEF) if(data[1] == 0xBB && data[2] == 0xBF) i = 3;
      for(var j = 1, k = 0, D = 0; i < len; i+=j) {
        j = 1; D = data[i];
        if(D < 128) w = D;
        else if(D < 224) { w=(D&31)*64+(data[i+1]&63); j=2; }
        else if(D < 240) { w=((D&15)<<12)+(data[i+1]&63)*64+(data[i+2]&63); j=3; }
        else { w=(D&7)*262144+((data[i+1]&63)<<12)+(data[i+2]&63)*64+(data[i+3]&63); j=4; }
        if(w < 65536) { mdb[k++] = w&255; mdb[k++] = w>>8; }
        else {
          w -= 65536; ww = 0xD800 + ((w>>10)&1023); w = 0xDC00 + (w&1023);
          mdb[k++] = ww&255; mdb[k++] = ww>>>8; mdb[k++] = w&255; mdb[k++] = (w>>>8)&255;
        }
      }
      return mdb.slice(0,k).toString('ucs2');
    };
    magic_encode[65001] = function utf8_e(data/*:StrData*/, ofmt/*:?string*/)/*:any*/ {
      if(has_buf && /*::data instanceof Buffer && */Buffer.isBuffer(data)) {
        if(!ofmt || ofmt === 'buf') return data;
        if(ofmt !== 'arr') return data.toString('binary');
        return [].slice.call(data);
      }
/*::
      // data cannot be a buffer at this point
      if(data instanceof Buffer) throw "";
*/
      var len = data.length, w = 0, ww = 0, j = 0;
      var direct = typeof data === "string";
      if(4 * len > mdl) { mdl = 4 * len; mdb = Buffer.allocUnsafe(mdl); }
      for(var i = 0; i < len; ++i) {
        w = direct /*::&& typeof data === "string" */? data.charCodeAt(i) : data[i].charCodeAt(0);
        if(w <= 0x007F) mdb[j++] = w;
        else if(w <= 0x07FF) {
          mdb[j++] = 192 + (w >> 6);
          mdb[j++] = 128 + (w&63);
        } else if(w >= 0xD800 && w <= 0xDFFF) {
          w -= 0xD800; ++i;
          ww = (direct /*::&& typeof data === "string" */? data.charCodeAt(i) : data[i].charCodeAt(0)) - 0xDC00 + (w << 10);
          mdb[j++] = 240 + ((ww>>>18) & 0x07);
          mdb[j++] = 144 + ((ww>>>12) & 0x3F);
          mdb[j++] = 128 + ((ww>>>6) & 0x3F);
          mdb[j++] = 128 + (ww & 0x3F);
        } else {
          mdb[j++] = 224 + (w >> 12);
          mdb[j++] = 128 + ((w >> 6)&63);
          mdb[j++] = 128 + (w&63);
        }
      }
      if(!ofmt || ofmt === 'buf') return mdb.slice(0,j);
      if(ofmt !== 'arr') return mdb.slice(0,j).toString('binary');
      return [].slice.call(mdb, 0, j);
    };
  }

  var encache = function encache() {
    if(has_buf) {
      if(cpdcache[sbcs_cache[0]]) return;
      var i=0, s=0;
      for(i = 0; i < sbcs_cache.length; ++i) {
        s = sbcs_cache[i];
        if(cpt[s]) {
          cpdcache[s] = sbcs_decode(s);
          cpecache[s] = sbcs_encode(s);
        }
      }
      for(i = 0; i < dbcs_cache.length; ++i) {
        s = dbcs_cache[i];
        if(cpt[s]) {
          cpdcache[s] = dbcs_decode(s);
          cpecache[s] = dbcs_encode(s);
        }
      }
      for(i = 0; i < magic_cache.length; ++i) {
        s = magic_cache[i];
        if(magic_decode[s]) cpdcache[s] = magic_decode[s];
        if(magic_encode[s]) cpecache[s] = magic_encode[s];
      }
    }
  };
  var null_enc = function(data/*:StrData*/, ofmt/*:?string*/) { void ofmt; return ""; };
  var cp_decache = function cp_decache(cp/*:CPIndex*/)/*:void*/ { delete cpdcache[cp]; delete cpecache[cp]; };
  var decache = function decache() {
    if(has_buf) {
      if(!cpdcache[sbcs_cache[0]]) return;
      sbcs_cache.forEach(cp_decache);
      dbcs_cache.forEach(cp_decache);
      magic_cache.forEach(cp_decache);
    }
    last_enc = null_enc; last_cp = 0;
  };
  var cache = {
    encache: encache,
    decache: decache,
    sbcs: sbcs_cache,
    dbcs: dbcs_cache
  };

  encache();

  var BM = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  var SetD = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'(),-./:?";
  var last_enc/*:Encoder*/ = null_enc, last_cp/*:CPIndex*/ = 0;
  var encode = function encode(cp/*:CPIndex*/, data/*:StrData*/, ofmt/*:?string*/)/*:OutType*/ {
    if(cp === last_cp && last_enc) { return last_enc(data, ofmt); }
    if(cpecache[cp]) { last_enc = cpecache[last_cp=cp]; return last_enc(data, ofmt); }
    if(has_buf && /*::data instanceof Buffer && */Buffer.isBuffer(data)) data = data.toString('utf8');
/*::
      // data cannot be a buffer at this point
      if(data instanceof Buffer) throw "";
*/
    var len = data.length;
    var out = has_buf ? Buffer.allocUnsafe(4*len) : [], w=0, i=0, j = 0, ww=0;
    var C/*:CPEntry*/ = cpt[cp], E/*:EMap*/, M/*:string*/ = "";
    var isstr = typeof data === 'string';
    if(C && (E=C.enc)) for(i = 0; i < len; ++i, ++j) {
      w = E[isstr/*:: && typeof data == 'string' */? data.charAt(i) : data[i]];
      if(w > 255) {
        out[j] = w>>8;
        out[++j] = w&255;
      } else out[j] = w&255;
    }
    else if((M=magic[cp])) switch(M) {
      case "utf8":
        if(has_buf && isstr/*:: && typeof data == 'string' */) { out = Buffer_from(data, M); j = out.length; break; }
        for(i = 0; i < len; ++i, ++j) {
          w = isstr/*:: && typeof data == 'string' */ ? data.charCodeAt(i) : data[i].charCodeAt(0);
          if(w <= 0x007F) out[j] = w;
          else if(w <= 0x07FF) {
            out[j]   = 192 + (w >> 6);
            out[++j] = 128 + (w&63);
          } else if(w >= 0xD800 && w <= 0xDFFF) {
            w -= 0xD800;
            ww = (isstr/*:: && typeof data == 'string' */ ? data.charCodeAt(++i) : data[++i].charCodeAt(0)) - 0xDC00 + (w << 10);
            out[j]   = 240 + ((ww>>>18) & 0x07);
            out[++j] = 144 + ((ww>>>12) & 0x3F);
            out[++j] = 128 + ((ww>>>6) & 0x3F);
            out[++j] = 128 + (ww & 0x3F);
          } else {
            out[j]   = 224 + (w >> 12);
            out[++j] = 128 + ((w >> 6)&63);
            out[++j] = 128 + (w&63);
          }
        }
        break;
      case "ascii":
        if(has_buf && typeof data === "string") { out = Buffer_from(data, M); j = out.length; break; }
        for(i = 0; i < len; ++i, ++j) {
          w = isstr/*:: && typeof data == 'string' */ ? data.charCodeAt(i) : data[i].charCodeAt(0);
          if(w <= 0x007F) out[j] = w;
          else throw new Error("bad ascii " + w);
        }
        break;
      case "utf16le":
        if(has_buf && typeof data === "string") { out = Buffer_from(data, M); j = out.length; break; }
        for(i = 0; i < len; ++i) {
          w = isstr/*:: && typeof data == 'string' */ ? data.charCodeAt(i) : data[i].charCodeAt(0);
          out[j++] = w&255;
          out[j++] = w>>8;
        }
        break;
      case "utf16be":
        for(i = 0; i < len; ++i) {
          w = isstr/*:: && typeof data == 'string' */ ? data.charCodeAt(i) : data[i].charCodeAt(0);
          out[j++] = w>>8;
          out[j++] = w&255;
        }
        break;
      case "utf32le":
        for(i = 0; i < len; ++i) {
          w = isstr/*:: && typeof data == 'string' */ ? data.charCodeAt(i) : data[i].charCodeAt(0);
          if(w >= 0xD800 && w <= 0xDFFF) w = 0x10000 + ((w - 0xD800) << 10) + (data[++i].charCodeAt(0) - 0xDC00);
          out[j++] = w&255; w >>= 8;
          out[j++] = w&255; w >>= 8;
          out[j++] = w&255; w >>= 8;
          out[j++] = w&255;
        }
        break;
      case "utf32be":
        for(i = 0; i < len; ++i) {
          w = isstr/*:: && typeof data == 'string' */ ? data.charCodeAt(i) : data[i].charCodeAt(0);
          if(w >= 0xD800 && w <= 0xDFFF) w = 0x10000 + ((w - 0xD800) << 10) + (data[++i].charCodeAt(0) - 0xDC00);
          out[j+3] = w&255; w >>= 8;
          out[j+2] = w&255; w >>= 8;
          out[j+1] = w&255; w >>= 8;
          out[j] = w&255;
          j+=4;
        }
        break;
      case "utf7":
        for(i = 0; i < len; i++) {
/*::
      // data cannot be a buffer at this point
      if(data instanceof Buffer) throw "";
*/
          var c/*:string*/ = isstr/*:: && typeof data == 'string' */ ? data.charAt(i) : data[i].charAt(0);
          if(c === "+") { out[j++] = 0x2b; out[j++] = 0x2d; continue; }
          if(SetD.indexOf(c) > -1) { out[j++] = c.charCodeAt(0); continue; }
          var 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 = out.slice(0,j);
    if(!has_buf) return (ofmt == 'str') ? (out/*:any*/).map(sfcc).join("") : out;
    if(!ofmt || ofmt === 'buf') return out;
    if(ofmt !== 'arr') return /*::((*/out/*:: :any) :Buffer)*/.toString('binary');
    return [].slice.call(out);
  };
  var decode = function decode(cp/*:CPIndex*/, data/*:Data*/)/*:string*/ {
    var F/*:Decoder*/; if((F=cpdcache[cp])) return F(data);
    if(typeof data === "string") return decode(cp, data.split("").map(cca));
    var len = data.length, out = new Array(len), s="", w=0, i=0, j=1, k=0, ww=0;
    var C/*:CPEntry*/ = cpt[cp], D/*:DMap*/, M="";
    if(C && (D=C.dec)) {
      for(i = 0; i < len; i+=j) {
        j = 2;
        s = D[(data[i]<<8)+ data[i+1]];
        if(!s) {
          j = 1;
          s = D[data[i]];
        }
        if(!s) throw new Error('Unrecognized code: ' + data[i] + ' ' + data[i+j-1] + ' ' + i + ' ' + j + ' ' + D[data[i]]);
        out[k++] = s;
      }
    }
    else if((M=magic[cp])) switch(M) {
      case "utf8":
        if(len >= 3 && data[0] == 0xEF) if(data[1] == 0xBB && data[2] == 0xBF) i = 3;
        for(; i < len; 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 if(data[i] < 240) { w=((data[i]&15)<<12)+(data[i+1]&63)*64+(data[i+2]&63); j=3; }
          else { w=(data[i]&7)*262144+((data[i+1]&63)<<12)+(data[i+2]&63)*64+(data[i+3]&63); j=4; }
          if(w < 65536) { out[k++] = String.fromCharCode(w); }
          else {
            w -= 65536; ww = 0xD800 + ((w>>10)&1023); w = 0xDC00 + (w&1023);
            out[k++] = String.fromCharCode(ww); out[k++] = String.fromCharCode(w);
          }
        }
        break;
      case "ascii":
        if(has_buf && /*::data instanceof Buffer && */Buffer.isBuffer(data)) return data.toString(M);
        for(i = 0; i < len; i++) out[i] = String.fromCharCode(data[i]);
        k = len; break;
      case "utf16le":
        if(len >= 2 && data[0] == 0xFF) if(data[1] == 0xFE) i = 2;
        if(has_buf && /*::data instanceof Buffer && */Buffer.isBuffer(data)) return data.toString(M);
        j = 2;
        for(; i+1 < len; i+=j) {
          out[k++] = String.fromCharCode((data[i+1]<<8) + data[i]);
        }
        break;
      case "utf16be":
        if(len >= 2 && data[0] == 0xFE) if(data[1] == 0xFF) i = 2;
        j = 2;
        for(; i+1 < len; i+=j) {
          out[k++] = String.fromCharCode((data[i]<<8) + data[i+1]);
        }
        break;
      case "utf32le":
        if(len >= 4 && data[0] == 0xFF) if(data[1] == 0xFE && data[2] === 0 && data[3] === 0) i = 4;
        j = 4;
        for(; i < len; i+=j) {
          w = (data[i+3]<<24) + (data[i+2]<<16) + (data[i+1]<<8) + (data[i]);
          if(w > 0xFFFF) {
            w -= 0x10000;
            out[k++] = String.fromCharCode(0xD800 + ((w >> 10) & 0x3FF));
            out[k++] = String.fromCharCode(0xDC00 + (w & 0x3FF));
          }
          else out[k++] = String.fromCharCode(w);
        }
        break;
      case "utf32be":
        if(len >= 4 && data[3] == 0xFF) if(data[2] == 0xFE && data[1] === 0 && data[0] === 0) i = 4;
        j = 4;
        for(; i < len; i+=j) {
          w = (data[i]<<24) + (data[i+1]<<16) + (data[i+2]<<8) + (data[i+3]);
          if(w > 0xFFFF) {
            w -= 0x10000;
            out[k++] = String.fromCharCode(0xD800 + ((w >> 10) & 0x3FF));
            out[k++] = String.fromCharCode(0xDC00 + (w & 0x3FF));
          }
          else out[k++] = String.fromCharCode(w);
        }
        break;
      case "utf7":
        if(len >= 4 && data[0] == 0x2B && data[1] == 0x2F && data[2] == 0x76) {
          if(len >= 5 && data[3] == 0x38 && data[4] == 0x2D) i = 5;
          else if(data[3] == 0x38 || data[3] == 0x39 || data[3] == 0x2B || data[3] == 0x2F) i = 4;
        }
        for(; i < len; 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; }
          // eslint-disable-next-line no-useless-escape
          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=0, c2=0, c3=0;
          var e1=0, e2=0, e3=0, e4=0;
          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);
          }
          o64 = decode(1201, tt);
          for(l = 0; l < o64.length; ++l) out[k++] = o64.charAt(l);
        }
        break;
      default: throw new Error("Unsupported magic: " + cp + " " + magic[cp]);
    }
    else throw new Error("Unrecognized CP: " + cp);
    return out.slice(0,k).join("");
  };
  var hascp = function hascp(cp/*:number*/)/*:boolean*/ { return !!(cpt[cp] || magic[cp]); };
  const utils = { decode: decode, encode: encode, hascp: hascp, magic: magic, cache:cache };
  export { utils };