1 files changed, 99 insertions, 0 deletions
diff --git a/comphelper/source/xml/xmltools.cxx b/comphelper/source/xml/xmltools.cxx
new file mode 100644
index 000000000..1b10964b1
--- /dev/null
+++ b/comphelper/source/xml/xmltools.cxx
@@ -0,0 +1,99 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <comphelper/xmltools.hxx>
+#include <rtl/random.h>
+#include <tools/Guid.hxx>
+#include <vector>
+
+using namespace com::sun::star;
+
+namespace
+{
+    //Will be inside an xml comment, so can't use '-' in case '--' appears in
+    //output, etc. Despite what *is* legal in an xml comment, just using the
+    //base-64 subset to avoid pain with simplistic third-party parsers
+    const sal_uInt8 aChaffEncoder[] =
+    {
+        'A', 'Q', 'g', 'w', 'B', 'R', 'h', 'x',
+        'C', 'S', 'i', 'y', 'D', 'T', 'j', 'z',
+        'E', 'U', 'k', '0', 'F', 'V', 'l', '1',
+        'G', 'W', 'm', '2', 'H', 'X', 'n', '3',
+        'I', 'Y', 'o', '4', 'J', 'Z', 'p', '5',
+        'K', 'a', 'q', '6', 'L', 'b', 'r', '7',
+        'M', 'c', 's', '8', 'N', 'd', 't', '9',
+        'O', 'e', 'u', '+', 'P', 'f', 'v', '/',
+
+        'A', 'Q', 'g', 'w', 'B', 'R', 'h', 'x',
+        'C', 'S', 'i', 'y', 'D', 'T', 'j', 'z',
+        'E', 'U', 'k', '0', 'F', 'V', 'l', '1',
+        'G', 'W', 'm', '2', 'H', 'X', 'n', '3',
+        'I', 'Y', 'o', '4', 'J', 'Z', 'p', '5',
+        'K', 'a', 'q', '6', 'L', 'b', 'r', '7',
+        'M', 'c', 's', '8', 'N', 'd', 't', '9',
+        'O', 'e', 'u', '+', 'P', 'f', 'v', '/',
+
+        'A', 'Q', 'g', 'w', 'B', 'R', 'h', 'x',
+        'C', 'S', 'i', 'y', 'D', 'T', 'j', 'z',
+        'E', 'U', 'k', '0', 'F', 'V', 'l', '1',
+        'G', 'W', 'm', '2', 'H', 'X', 'n', '3',
+        'I', 'Y', 'o', '4', 'J', 'Z', 'p', '5',
+        'K', 'a', 'q', '6', 'L', 'b', 'r', '7',
+        'M', 'c', 's', '8', 'N', 'd', 't', '9',
+        'O', 'e', 'u', '+', 'P', 'f', 'v', '/',
+
+        'A', 'Q', 'g', 'w', 'B', 'R', 'h', 'x',
+        'C', 'S', 'i', 'y', 'D', 'T', 'j', 'z',
+        'E', 'U', 'k', '0', 'F', 'V', 'l', '1',
+        'G', 'W', 'm', '2', 'H', 'X', 'n', '3',
+        'I', 'Y', 'o', '4', 'J', 'Z', 'p', '5',
+        'K', 'a', 'q', '6', 'L', 'b', 'r', '7',
+        'M', 'c', 's', '8', 'N', 'd', 't', '9',
+        'O', 'e', 'u', '+', 'P', 'f', 'v', '/'
+    };
+
+    void encodeChaff(std::vector<sal_uInt8> &rChaff)
+    {
+        static_assert(sizeof(aChaffEncoder) == 256, "this has to cover all chars");
+
+        for (auto & elem : rChaff)
+        {
+            elem = aChaffEncoder[elem];
+        }
+    }
+}
+
+namespace comphelper::xml
+{
+        OString makeXMLChaff()
+        {
+            rtlRandomPool pool = rtl_random_createPool();
+
+            sal_Int8 n;
+            rtl_random_getBytes(pool, &n, 1);
+
+            sal_Int32 nLength = 1024+n;
+            // coverity[tainted_data] - 1024 deliberate random minus max -127/plus max 128
+            std::vector<sal_uInt8> aChaff(nLength);
+            rtl_random_getBytes(pool, aChaff.data(), nLength);
+
+            rtl_random_destroyPool(pool);
+
+            encodeChaff(aChaff);
+
+            return OString(reinterpret_cast<const char*>(aChaff.data()), nLength);
+        }
+
+        OString generateGUIDString()
+        {
+            tools::Guid aGuid(tools::Guid::Generate);
+            return aGuid.getString();
+        }
+}
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */