adbkit/lib/adb/linetransform.js

A pure Node.js client for the Android Debug Bridge.

var LineTransform, Stream,
  extend = function(child, parent) { for (var key in parent) { if (hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; },
  hasProp = {}.hasOwnProperty;

Stream = require('stream');

LineTransform = (function(superClass) {
  extend(LineTransform, superClass);

  function LineTransform(options) {
    this.savedR = null;
    LineTransform.__super__.constructor.call(this, options);
  }

  LineTransform.prototype._transform = function(chunk, encoding, done) {
    var hi, last, lo;
    lo = 0;
    hi = 0;
    if (this.savedR) {
      if (chunk[0] !== 0x0a) {
        this.push(this.savedR);
      }
      this.savedR = null;
    }
    last = chunk.length - 1;
    while (hi <= last) {
      if (chunk[hi] === 0x0d) {
        if (hi === last) {
          this.savedR = chunk.slice(last);
          break;
        } else if (chunk[hi + 1] === 0x0a) {
          this.push(chunk.slice(lo, hi));
          lo = hi + 1;
        }
      }
      hi += 1;
    }
    if (hi !== lo) {
      this.push(chunk.slice(lo, hi));
    }
    done();
  };

  LineTransform.prototype._flush = function(done) {
    if (this.savedR) {
      this.push(this.savedR);
    }
    return done();
  };

  return LineTransform;

})(Stream.Transform);

module.exports = LineTransform;