[apps/tidep0084.git] / example / iot-gateway / node_modules / aws-iot-device-sdk / node_modules / websocket-stream / node_modules / duplexify / node_modules / stream-shift / index.js
1 module.exports = shift
3 function shift (stream) {
4 var rs = stream._readableState
5 if (!rs) return null
6 return rs.objectMode ? stream.read() : stream.read(getStateLength(rs))
7 }
9 function getStateLength (state) {
10 if (state.buffer.length) {
11 // Since node 6.3.0 state.buffer is a BufferList not an array
12 if (state.buffer.head) {
13 return state.buffer.head.data.length
14 }
16 return state.buffer[0].length
17 }
19 return state.length
20 }