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Version.js
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Version.js
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/*@flow*/
/*
* You may redistribute this program and/or modify it under the terms of
* the GNU General Public License as published by the Free Software Foundation,
* either version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
'use strict';
const SIZE = module.exports.SIZE = 4;
const TYPE = module.exports.TYPE = 2;
const parse = module.exports.parse = (hdrBytes /*:Buffer*/) => {
if (hdrBytes.length < SIZE) { throw new Error("runt"); }
let x = 0;
const length = hdrBytes[x++];
const type = hdrBytes[x++];
if (length !== SIZE) { throw new Error("invalid length"); }
if (type !== TYPE) { throw new Error("invalid type"); }
const version = hdrBytes.readUInt16BE(x);
return Object.freeze({
type: 'Version',
version: version
});
};