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node_modules/cbor/vendor/binary-parse-stream/index.js

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+// Tweaked version of nathan7's binary-parse-stream
+// (see https://github.com/nathan7/binary-parse-stream)
+// Uses NoFilter instead of the readable in the original.  Removes
+// the ability to read -1, which was odd and un-needed.
+// License for binary-parse-stream: MIT
+
+// binary-parse-stream is now unmaintained, so I'm going to rewrite it as
+// more modern JS so I can get tsc to help check types.
+
+'use strict'
+const Stream = require('stream')
+const NoFilter = require('nofilter')
+const TransformStream = Stream.Transform
+
+/**
+ * BinaryParseStream is a TransformStream that consumes buffers and outputs
+ * objects on the other end.  It expects your subclass to implement a `_parse`
+ * method that is a generator.  When your generator yields a number, it'll be
+ * fed a buffer of that length from the input.  When your generator returns,
+ * the return value will be pushed to the output side.
+ *
+ * @class BinaryParseStream
+ * @extends {TransformStream}
+ */
+class BinaryParseStream extends TransformStream {
+  constructor(options) {
+    super(options)
+    // doesn't work to pass these in as opts, for some reason
+    this['_writableState'].objectMode = false
+    this['_readableState'].objectMode = true
+
+    this.bs = new NoFilter()
+    this.__restart()
+  }
+
+  _transform(fresh, encoding, cb) {
+    this.bs.write(fresh)
+
+    while (this.bs.length >= this.__needed) {
+      let ret
+      const chunk = (this.__needed === null) ?
+        undefined : this.bs.read(this.__needed)
+
+      try {
+        ret = this.__parser.next(chunk)
+      } catch (e) {
+        return cb(e)
+      }
+  
+      if (this.__needed) {
+        this.__fresh = false
+      }
+
+      if (!ret.done) {
+        this.__needed = ret.value || 0
+      } else {
+        this.push(ret.value)
+        this.__restart()
+      }
+    }
+  
+    return cb()
+  }
+
+  /**
+   * @abstract
+   */
+  /* istanbul ignore next */
+  *_parse() {
+    throw new Error('Must be implemented in subclass')
+  }
+
+  __restart() {
+    this.__needed = null
+    this.__parser = this._parse()
+    this.__fresh = true
+  }
+
+  _flush(cb) {
+    cb(this.__fresh ? null : new Error('unexpected end of input'))
+  }
+}
+
+module.exports = BinaryParseStream