if(typeof cptable === "undefined" && typeof require !== "undefined") var cptable = require('./cptable');

(function(cpt){
  var magic = {
    "1200":"utf16le",
    "1201":"utf16be",
    "12000":"utf32le",
    "12001":"utf32be",
    "20127":"ascii",
    "65000":"utf7",
    "65001":"utf8"
  };
  var encode = function(cp, data, ofmt) {
    var out = [], w, i, j = 0;
    if(cpt[cp]) {
      for(i = 0; i != data.length; ++i, ++j) {
        w = cpt[cp].enc[data[i]];
        out[j] = w % 256;
        if(w > 255) {
          out[j] = (w/256)|0;
          out[++j] = w%256;
        }
      }
    }
    else if(magic[cp]) switch(magic[cp]) { 
      case "utf8": 
        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;
      default: throw "Unsupported magic: " + cp + " " + magic[cp];
    }
    else throw new Error("Unrecognized CP: " + cp); 
    if(ofmt == 'str') return out.map(function(x) { return String.fromCharCode(x); }).join("");
    if(ofmt == 'buf') return new Buffer(out);
    return out;
  };
  var decode = function(cp, data, endian) {
    var out = "", w, i, j = 1;
    if(cpt[cp]) for(i = 0; i != data.length; i+=j) {
      j = 1;
      w = cpt[cp].dec[data[i]];
      if(typeof w === 'undefined') {
        j = 2;
        w = cpt[cp].dec[endian ? data[i]+data[i+1]*256 : data[i]*256 + data[i+1]];
      }
      if(typeof w === 'undefined') throw 'Unrecognized code: ' + data[i] + ' ' + data[i+j-1] + ' ' + i + ' ' + j;
      out += w;
    }
    else if(magic[cp]) switch(magic[cp]) {
      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 += String.fromCharCode(w);
        } break;
      default: throw "Unsupported magic: " + cp + " " + magic[cp];
    }
    return out; 
  };
  var hascp = function(cp) {
    return cpt[cp] || magic[cp];
  };
  cpt.utils = { decode: decode, encode: encode, hascp: hascp, magic: magic };
})(cptable);

if(typeof module !== "undefined") module.exports = cptable;