node-aurora/lib/AuroraCmdReadFile.js

Provides an interface to the Aurora Dreamband.

'use strict';

var _promise = require('babel-runtime/core-js/promise');

var _promise2 = _interopRequireDefault(_promise);

var _util = require('./util');

var _bufferCrc = require('buffer-crc32');

var _bufferCrc2 = _interopRequireDefault(_bufferCrc);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

module.exports = function (srcPath) {
    var writeStream = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
    var connector = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 'any';


    var srcPathSegments = srcPath.split('/');

    var srcFileName = srcPathSegments.pop();
    var srcFileDir = srcPathSegments.length ? srcPathSegments.join('/') : '/';

    /*
    if (connector != 'bluetooth' && this.isMsdAttached()){
      }
    */

    var outputChunks = [];
    var crc = void 0;
    var stream = void 0;

    return this.queueCmd('sd-file-read ' + srcFileName + ' ' + srcFileDir + ' 0', connector, function (cmd) {

        cmd.outputStream.on('data', function (chunk) {
            crc = _bufferCrc2.default.unsigned(chunk, crc);
        });

        stream = cmd.outputStream;

        if (writeStream) {

            stream = stream.pipe(writeStream);
        }

        stream.on('data', function (chunk) {
            outputChunks.push(chunk);
        });
    }).then(function (cmdWithResponse) {

        return (0, _util.promisifyStream)(stream).then(function () {

            if (cmdWithResponse.response.crc != crc) return _promise2.default.reject('CRC failed.');

            cmdWithResponse.output = writeStream ? outputChunks : outputChunks.map(String).join('');

            return cmdWithResponse;
        });
    });
};