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node_modules/compress-commons/lib/util/index.js

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+/**
+ * node-compress-commons
+ *
+ * Copyright (c) 2014 Chris Talkington, contributors.
+ * Licensed under the MIT license.
+ * https://github.com/archiverjs/node-compress-commons/blob/master/LICENSE-MIT
+ */
+var Stream = require('stream').Stream;
+var PassThrough = require('readable-stream').PassThrough;
+var isStream = require('is-stream');
+
+var util = module.exports = {};
+
+util.normalizeInputSource = function(source) {
+  if (source === null) {
+    return Buffer.alloc(0);
+  } else if (typeof source === 'string') {
+    return Buffer.from(source);
+  } else if (isStream(source) && !source._readableState) {
+    var normalized = new PassThrough();
+    source.pipe(normalized);
+
+    return normalized;
+  }
+
+  return source;
+};