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74 lines
2.0 KiB
C++
74 lines
2.0 KiB
C++
// Copyright (c) 2005-2022 Jay Berkenbilt
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//
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// This file is part of qpdf.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Versions of qpdf prior to version 7 were released under the terms
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// of version 2.0 of the Artistic License. At your option, you may
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// continue to consider qpdf to be licensed under those terms. Please
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// see the manual for additional information.
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#ifndef PL_FUNCTION_HH
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#define PL_FUNCTION_HH
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// This pipeline calls an arbitrary function with whatever data is
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// passed to it. This pipeline can be reused.
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//
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// For this pipeline, "next" may be null. If a next pointer is
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// provided, this pipeline will also pass the data through to it and
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// will forward finish() to it.
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//
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// It is okay to not call finish() on this pipeline if it has no
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// "next".
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#include <qpdf/Pipeline.hh>
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#include <functional>
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class QPDF_DLL_CLASS Pl_Function: public Pipeline
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{
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public:
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typedef std::function<void(unsigned char const*, size_t)> writer_t;
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QPDF_DLL
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Pl_Function(char const* identifier, Pipeline* next, writer_t fn);
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QPDF_DLL
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virtual ~Pl_Function();
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QPDF_DLL
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virtual void write(unsigned char const* buf, size_t len);
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QPDF_DLL
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virtual void finish();
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private:
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class QPDF_DLL_PRIVATE Members
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{
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friend class Pl_Function;
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public:
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QPDF_DLL
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~Members() = default;
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private:
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Members(writer_t);
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Members(Members const&) = delete;
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writer_t fn;
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};
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std::shared_ptr<Members> m;
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};
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#endif // PL_FUNCTION_HH
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