stuff

buildfiles/app/node_modules/probe-image-size/stream.js

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+'use strict';
+
+
+var ProbeError  = require('./lib/common').ProbeError;
+var parsers     = require('./lib/parsers_stream');
+var PassThrough = require('stream').PassThrough;
+
+
+module.exports = function probeStream(stream) {
+  var proxy = new PassThrough();
+  var cnt = 0; // count of working parsers
+
+  var result = new Promise(function (resolve, reject) {
+    stream.on('error', reject);
+    proxy.on('error', reject);
+
+    function nope() {}
+
+    function parserEnd() {
+      proxy.unpipe(this);
+      this.removeAllListeners();
+      cnt--;
+      // if all parsers finished without success -> fail.
+      if (!cnt) reject(new ProbeError('unrecognized file format', 'ECONTENT'));
+    }
+
+    Object.keys(parsers).forEach(function (type) {
+      var pStream = parsers[type]();
+
+      cnt++;
+
+      pStream.once('data', resolve);
+      pStream.once('end', parserEnd);
+      // silently ignore errors because user does not need to know
+      // that something wrong is happening here
+      pStream.on('error', nope);
+
+      proxy.pipe(pStream);
+    });
+  });
+
+  function cleanup() {
+    // request stream doesn't have unpipe, https://github.com/request/request/issues/874
+    if (typeof stream.unpipe === 'function') stream.unpipe(proxy);
+    proxy.end();
+  }
+
+  result.then(cleanup).catch(cleanup);
+
+  stream.pipe(proxy);
+
+  return result;
+};
+
+
+module.exports.parsers = parsers;