1 files changed, 95 insertions, 0 deletions
diff --git a/basic/source/comp/buffer.cxx b/basic/source/comp/buffer.cxx
new file mode 100644
index 000000000..ff6b5173f
--- /dev/null
+++ b/basic/source/comp/buffer.cxx
@@ -0,0 +1,95 @@
+/* -*- 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/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you 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 .
+ */
+
+#include <buffer.hxx>
+#include <basic/sberrors.hxx>
+
+namespace
+{
+const sal_uInt32 UP_LIMIT=0xFFFFFF00;
+
+template <class I, typename T> void write(I it, T n)
+{
+    *it = static_cast<sal_uInt8>(n & 0xFF);
+    // coverity[stray_semicolon : FALSE] - coverity parse error
+    if constexpr (sizeof(n) > 1)
+    {
+        for (std::size_t i = 1; i < sizeof(n); ++i)
+        {
+            n >>= 8;
+            *++it = static_cast<sal_uInt8>(n & 0xFF);
+        }
+    }
+}
+}
+
+template <typename T> void SbiBuffer::append(T n)
+{
+    if (m_aErrCode)
+        return;
+    if ((m_aBuf.size() + sizeof(n)) > UP_LIMIT)
+    {
+        m_aErrCode = ERRCODE_BASIC_PROG_TOO_LARGE;
+        m_aBuf.clear();
+        return;
+    }
+    m_aBuf.reserve(m_aBuf.size() + sizeof(n));
+    write(std::back_inserter(m_aBuf), n);
+}
+
+void SbiBuffer::operator+=(sal_Int8 n) { append(n); }
+void SbiBuffer::operator+=(sal_Int16 n) { append(n); }
+void SbiBuffer::operator+=(sal_uInt8 n) { append(n); }
+void SbiBuffer::operator+=(sal_uInt16 n) { append(n); }
+void SbiBuffer::operator+=(sal_uInt32 n) { append(n); }
+void SbiBuffer::operator+=(sal_Int32 n) { append(n); }
+
+// Patch of a Location
+
+void SbiBuffer::Patch( sal_uInt32 off, sal_uInt32 val )
+{
+    if (m_aErrCode)
+        return;
+    if ((off + sizeof(sal_uInt32)) <= GetSize())
+        write(m_aBuf.begin() + off, val);
+}
+
+// Forward References upon label and procedures
+// establish a linkage. The beginning of the linkage is at the passed parameter,
+// the end of the linkage is 0.
+
+void SbiBuffer::Chain( sal_uInt32 off )
+{
+    if (m_aErrCode)
+        return;
+    for (sal_uInt32 i = off; i;)
+    {
+        if ((i + sizeof(sal_uInt32)) > GetSize())
+        {
+            m_aErrCode = ERRCODE_BASIC_INTERNAL_ERROR;
+            m_sErrMsg = "BACKCHAIN";
+            break;
+        }
+        auto ip = m_aBuf.begin() + i;
+        i = ip[0] | (ip[1] << 8) | (ip[2] << 16) | (ip[3] << 24);
+        write(ip, GetSize());
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */