ZipStream

core/External/ZipStream/ZipStream.php

@@ -0,0 +1,72 @@
+<?php
+
+/**
+ * Copyright (c) Borago 2019
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty. In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ *    claim that you wrote the original software. If you use this software
+ *    in a product, an acknowledgment in the product documentation would be
+ *    appreciated but is not required.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ **/
+
+namespace External\ZipStream {
+  class ZipStream {
+    private $writer = null;
+    private $files = [];
+
+    public function __construct($writer) {
+      $this->writer = $writer;
+    }
+
+    public function saveFile($file) {
+      $isSymlink = false; //currently not used
+      foreach ($this->files as $f) {
+        if ($f->name() == $file->name()) {
+          return false;
+        }
+        if ($f->sha256() == $file->sha256()) {
+          $isSymlink = true;
+        }
+      }
+      $file->setOffset($this->writer->offset());
+      $this->writer->write($file->readLocalFileHeader());
+      while (($buffer = $file->readFileData()) !== null) {
+        $this->writer->write($buffer);
+      }
+      $this->writer->write($file->readDataDescriptor());
+      $this->files[] = $file;
+      $file->closeHandle();
+      return true;
+    }
+
+    public function close() {
+      $size = 0;
+      $offset = $this->writer->offset();
+      foreach ($this->files as $file) {
+        $size += $this->writer->write($file->readCentralDirectoryHeader());
+      }
+
+      $data = "";
+      $data .= "\x50\x4b\x05\x06";
+      $data .= "\x00\x00"; //number of disks
+      $data .= "\x00\x00"; //number of the disk with the start of the central directory
+      $data .= pack("v", count($this->files)); //total number of entries in the central directory on this disk
+      $data .= pack("v", count($this->files)); //total number of entries in the central directory
+      $data .= pack("V", $size); //size of the central directory
+      $data .= pack("V", $offset); //offset of start of central directory with respect to the starting disk number
+      $data .= "\x0\x0"; //comment length
+      $this->writer->write($data);
+    }
+  }
+}