chore: import upstream snapshot with attribution

2026-07-13 13:02:50 +08:00
commit 0fc60fdcb1
5008 changed files with 910633 additions and 0 deletions
@@ -0,0 +1,117 @@
+/*
+ * QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
+ * Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+*/
+
+using System.IO;
+using System.IO.Compression;
+using System.Text;
+
+namespace QuantConnect
+{
+    /// <summary>
+    /// Provides an implementation of <see cref="TextWriter"/> to write to a zip file
+    /// </summary>
+    public class ZipStreamWriter : TextWriter
+    {
+        private readonly ZipArchive _archive;
+        private readonly StreamWriter _writer;
+
+        /// <summary>
+        /// When overridden in a derived class, returns the character encoding in which the output is written.
+        /// </summary>
+        /// <returns>
+        /// The character encoding in which the output is written.
+        /// </returns>
+        /// <filterpriority>1</filterpriority>
+        public override Encoding Encoding => Encoding.Default;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ZipStreamWriter"/> class
+        /// </summary>
+        /// <param name="filename">The output zip file name</param>
+        /// <param name="zipEntry">The file name in the zip file</param>
+        public ZipStreamWriter(string filename, string zipEntry)
+        {
+            if(!File.Exists(filename))
+            {
+                _archive = ZipFile.Open(filename, ZipArchiveMode.Create);
+                var entry = _archive.CreateEntry(zipEntry);
+                _writer = new StreamWriter(entry.Open());
+            }
+            else
+            {
+                _archive = ZipFile.Open(filename, ZipArchiveMode.Update);
+                 var entry = _archive.GetEntry(zipEntry);
+                 var nonExisting = entry == null;
+                 if (nonExisting)
+                 {
+                     entry = _archive.CreateEntry(zipEntry);
+                 }
+                _writer = new StreamWriter(entry.Open());
+
+                if (!nonExisting)
+                {
+                    // can only seek when it already existed
+                    _writer.BaseStream.Seek(0L, SeekOrigin.End);
+                }
+            }
+        }
+
+        /// <summary>
+        /// Writes a character to the text string or stream.
+        /// </summary>
+        /// <param name="value">The character to write to the text stream. </param>
+        /// <exception cref="T:System.ObjectDisposedException">The <see cref="T:System.IO.TextWriter"/> is closed. </exception>
+        /// <exception cref="T:System.IO.IOException">An I/O error occurs. </exception>
+        /// <filterpriority>1</filterpriority>
+        public override void Write(char value)
+        {
+            _writer.Write(value);
+        }
+
+        /// <summary>
+        /// Writes a string followed by a line terminator to the text string or stream.
+        /// </summary>
+        /// <param name="value">The string to write. If <paramref name="value"/> is null, only the line terminator is written. </param>
+        /// <exception cref="T:System.ObjectDisposedException">The <see cref="T:System.IO.TextWriter"/> is closed. </exception>
+        /// <exception cref="T:System.IO.IOException">An I/O error occurs. </exception>
+        /// <filterpriority>1</filterpriority>
+        public override void WriteLine(string value)
+        {
+            _writer.WriteLine(value);
+        }
+
+        /// <summary>
+        /// Clears all buffers for the current writer and causes any buffered data to be written to the underlying device.
+        /// </summary>
+        public override void Flush()
+        {
+            _writer.Flush();
+        }
+
+        /// <summary>
+        /// Releases the unmanaged resources used by the <see cref="T:System.IO.TextWriter"/> and optionally releases the managed resources.
+        /// </summary>
+        /// <param name="disposing">true to release both managed and unmanaged resources; false to release only unmanaged resources. </param>
+        protected override void Dispose(bool disposing)
+        {
+            if (_writer == null || !disposing)
+                return;
+            _writer.Flush();
+            _writer.Close();
+            _writer.Dispose();
+            _archive.Dispose();
+        }
+    }
+}