Current File : //home/tradevaly/www/node_modules/restructure/src/DecodeStream.js

// Generated by CoffeeScript 1.7.1
(function() {
  var DecodeStream, iconv;

  try {
    iconv = require('iconv-lite');
  } catch (_error) {}

  DecodeStream = (function() {
    var key;

    function DecodeStream(buffer) {
      this.buffer = buffer;
      this.pos = 0;
      this.length = this.buffer.length;
    }

    DecodeStream.TYPES = {
      UInt8: 1,
      UInt16: 2,
      UInt24: 3,
      UInt32: 4,
      Int8: 1,
      Int16: 2,
      Int24: 3,
      Int32: 4,
      Float: 4,
      Double: 8
    };

    for (key in Buffer.prototype) {
      if (key.slice(0, 4) === 'read') {
        (function(key) {
          var bytes;
          bytes = DecodeStream.TYPES[key.replace(/read|[BL]E/g, '')];
          return DecodeStream.prototype[key] = function() {
            var ret;
            ret = this.buffer[key](this.pos);
            this.pos += bytes;
            return ret;
          };
        })(key);
      }
    }

    DecodeStream.prototype.readString = function(length, encoding) {
      var buf, byte, i, _i, _ref;
      if (encoding == null) {
        encoding = 'ascii';
      }
      switch (encoding) {
        case 'utf16le':
        case 'ucs2':
        case 'utf8':
        case 'ascii':
          return this.buffer.toString(encoding, this.pos, this.pos += length);
        case 'utf16be':
          buf = new Buffer(this.readBuffer(length));
          for (i = _i = 0, _ref = buf.length - 1; _i < _ref; i = _i += 2) {
            byte = buf[i];
            buf[i] = buf[i + 1];
            buf[i + 1] = byte;
          }
          return buf.toString('utf16le');
        default:
          buf = this.readBuffer(length);
          if (iconv) {
            try {
              return iconv.decode(buf, encoding);
            } catch (_error) {}
          }
          return buf;
      }
    };

    DecodeStream.prototype.readBuffer = function(length) {
      return this.buffer.slice(this.pos, this.pos += length);
    };

    DecodeStream.prototype.readUInt24BE = function() {
      return (this.readUInt16BE() << 8) + this.readUInt8();
    };

    DecodeStream.prototype.readUInt24LE = function() {
      return this.readUInt16LE() + (this.readUInt8() << 16);
    };

    DecodeStream.prototype.readInt24BE = function() {
      return (this.readInt16BE() << 8) + this.readUInt8();
    };

    DecodeStream.prototype.readInt24LE = function() {
      return this.readUInt16LE() + (this.readInt8() << 16);
    };

    return DecodeStream;

  })();

  module.exports = DecodeStream;

}).call(this);