1 files changed, 43 insertions, 0 deletions
diff --git a/vcl/source/pdf/ExternalPDFStreams.cxx b/vcl/source/pdf/ExternalPDFStreams.cxx
new file mode 100644
index 000000000000..08f31ed22829
--- /dev/null
+++ b/vcl/source/pdf/ExternalPDFStreams.cxx
@@ -0,0 +1,43 @@
+/* -*- 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 <pdf/ExternalPDFStreams.hxx>
+#include <comphelper/hash.hxx>
+
+namespace vcl
+{
+sal_Int32 ExternalPDFStreams::store(const sal_uInt8* pData, sal_uInt32 nLength)
+{
+    sal_Int32 nIndex = -1;
+
+    std::vector<sal_uInt8> aHash
+        = comphelper::Hash::calculateHash(pData, nLength, comphelper::HashType::SHA1);
+
+    auto it = maStreamIndexMap.find(aHash);
+    if (it == maStreamIndexMap.end())
+    {
+        auto& rExternalStream = maStreamList.emplace_back();
+        rExternalStream.maData.resize(nLength);
+        std::copy(pData, pData + nLength, rExternalStream.maData.begin());
+        nIndex = maStreamList.size() - 1;
+        maStreamIndexMap.emplace(aHash, nIndex);
+    }
+    else
+    {
+        nIndex = it->second;
+    }
+
+    return nIndex;
+}
+
+ExternalPDFStream& ExternalPDFStreams::get(sal_uInt32 nIndex) { return maStreamList.at(nIndex); }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */