更新

TongjiUniApp/node_modules/probe-image-size/stream.js

@@ -0,0 +1,80 @@
+'use strict'
+
+
+var ProbeError = require('./lib/common').ProbeError
+var parsers = require('./lib/parsers_stream')
+var PassThrough = require('stream').PassThrough
+var pipeline = require('stream').pipeline
+
+
+module.exports = function probeStream (src, keepOpen) {
+  var proxy = new PassThrough()
+
+  // increase max number of listeners to stop memory leak warning
+  proxy.setMaxListeners(Object.keys(parsers).length + 10)
+
+  var result = new Promise(function (resolve, reject) {
+    src.on('error', reject)
+    proxy.on('error', reject)
+
+    var alive_parsers = []
+    var last_error
+
+    function parserEnd (err) {
+      var idx = alive_parsers.indexOf[this]
+
+      /* istanbul ignore if */
+      if (idx < 0) return
+
+      /* istanbul ignore if */
+      if (err) last_error = err
+
+      proxy.unpipe(this)
+      this.removeAllListeners()
+      alive_parsers.splice(idx, 1)
+
+      if (alive_parsers.length) return
+
+      // if all parsers finished without success -> fail.
+      reject(last_error || new ProbeError('unrecognized file format', 'ECONTENT'))
+    }
+
+    Object.keys(parsers).forEach(function (type) {
+      var pStream = parsers[type]()
+
+      alive_parsers.push(pStream)
+
+      pStream.once('data', function (data) {
+        if (data.width > 0 && data.height > 0) {
+          resolve(data)
+          return
+        }
+
+        // Manually finish parser to get standars "unrecognized" error.
+        parserEnd.call(pStream)
+      })
+      pStream.once('end', parserEnd)
+      // User does not need to know that something wrong in parser
+      // Process error the same was unrecognized format (end without data)
+      pStream.on('error', parserEnd)
+
+      proxy.pipe(pStream)
+    })
+  })
+
+  function cleanup () {
+    // request stream doesn't have unpipe, https://github.com/request/request/issues/874
+    if (keepOpen && typeof src.unpipe === 'function') src.unpipe(proxy)
+    proxy.destroy()
+  }
+
+  result.then(cleanup).catch(cleanup)
+
+  if (keepOpen) src.pipe(proxy)
+  else pipeline(src, proxy, function () {})
+
+  return result
+}
+
+
+module.exports.parsers = parsers