Add new Pl_OStream Pipeline

1 files changed, 69 insertions, 0 deletions

diff --git a/include/qpdf/Pl_OStream.hh b/include/qpdf/Pl_OStream.hh
new file mode 100644
index 00000000..01cede8b
--- /dev/null
+++ b/include/qpdf/Pl_OStream.hh
@@ -0,0 +1,69 @@
+// Copyright (c) 2005-2022 Jay Berkenbilt
+//
+// This file is part of qpdf.
+//
+// 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.
+//
+// Versions of qpdf prior to version 7 were released under the terms
+// of version 2.0 of the Artistic License. At your option, you may
+// continue to consider qpdf to be licensed under those terms. Please
+// see the manual for additional information.
+
+// End-of-line pipeline that simply writes its data to a stdio FILE* object.
+
+#ifndef PL_OSTREAM_HH
+#define PL_OSTREAM_HH
+
+#include <qpdf/Pipeline.hh>
+
+#include <iostream>
+
+//
+// This pipeline is reusable.
+//
+
+class QPDF_DLL_CLASS Pl_OStream: public Pipeline
+{
+  public:
+    // os is externally maintained; this class just writes to and
+    // flushes it.  It does not close it.
+    QPDF_DLL
+    Pl_OStream(char const* identifier, std::ostream& os);
+    QPDF_DLL
+    virtual ~Pl_OStream();
+
+    QPDF_DLL
+    virtual void write(unsigned char const* buf, size_t len);
+    QPDF_DLL
+    virtual void finish();
+
+  private:
+    class QPDF_DLL_PRIVATE Members
+    {
+        friend class Pl_OStream;
+
+      public:
+        QPDF_DLL
+        ~Members() = default;
+
+      private:
+        Members(std::ostream&);
+        Members(Members const&) = delete;
+
+        std::ostream& os;
+    };
+
+    std::shared_ptr<Members> m;
+};
+
+#endif // PL_OSTREAM_HH