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network-visualization/node_modules/graceful-fs/legacy-streams.js

@@ -0,0 +1,118 @@
+var Stream = require('stream').Stream
+
+module.exports = legacy
+
+function legacy (fs) {
+  return {
+    ReadStream: ReadStream,
+    WriteStream: WriteStream
+  }
+
+  function ReadStream (path, options) {
+    if (!(this instanceof ReadStream)) return new ReadStream(path, options);
+
+    Stream.call(this);
+
+    var self = this;
+
+    this.path = path;
+    this.fd = null;
+    this.readable = true;
+    this.paused = false;
+
+    this.flags = 'r';
+    this.mode = 438; /*=0666*/
+    this.bufferSize = 64 * 1024;
+
+    options = options || {};
+
+    // Mixin options into this
+    var keys = Object.keys(options);
+    for (var index = 0, length = keys.length; index < length; index++) {
+      var key = keys[index];
+      this[key] = options[key];
+    }
+
+    if (this.encoding) this.setEncoding(this.encoding);
+
+    if (this.start !== undefined) {
+      if ('number' !== typeof this.start) {
+        throw TypeError('start must be a Number');
+      }
+      if (this.end === undefined) {
+        this.end = Infinity;
+      } else if ('number' !== typeof this.end) {
+        throw TypeError('end must be a Number');
+      }
+
+      if (this.start > this.end) {
+        throw new Error('start must be <= end');
+      }
+
+      this.pos = this.start;
+    }
+
+    if (this.fd !== null) {
+      process.nextTick(function() {
+        self._read();
+      });
+      return;
+    }
+
+    fs.open(this.path, this.flags, this.mode, function (err, fd) {
+      if (err) {
+        self.emit('error', err);
+        self.readable = false;
+        return;
+      }
+
+      self.fd = fd;
+      self.emit('open', fd);
+      self._read();
+    })
+  }
+
+  function WriteStream (path, options) {
+    if (!(this instanceof WriteStream)) return new WriteStream(path, options);
+
+    Stream.call(this);
+
+    this.path = path;
+    this.fd = null;
+    this.writable = true;
+
+    this.flags = 'w';
+    this.encoding = 'binary';
+    this.mode = 438; /*=0666*/
+    this.bytesWritten = 0;
+
+    options = options || {};
+
+    // Mixin options into this
+    var keys = Object.keys(options);
+    for (var index = 0, length = keys.length; index < length; index++) {
+      var key = keys[index];
+      this[key] = options[key];
+    }
+
+    if (this.start !== undefined) {
+      if ('number' !== typeof this.start) {
+        throw TypeError('start must be a Number');
+      }
+      if (this.start < 0) {
+        throw new Error('start must be >= zero');
+      }
+
+      this.pos = this.start;
+    }
+
+    this.busy = false;
+    this._queue = [];
+
+    if (this.fd === null) {
+      this._open = fs.open;
+      this._queue.push([this._open, this.path, this.flags, this.mode, undefined]);
+      this.flush();
+    }
+  }
+}