mirror of https://github.com/qpdf/qpdf.git
84 lines
2.7 KiB
C++
84 lines
2.7 KiB
C++
// Copyright (c) 2005-2024 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"); you may not use this file except
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// in compliance with the License. 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 distributed under the License
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// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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// or implied. See the License for the specific language governing permissions and limitations under
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// the License.
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//
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// Versions of qpdf prior to version 7 were released under the terms of version 2.0 of the Artistic
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// License. At your option, you may continue to consider qpdf to be licensed under those terms.
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// Please 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 passed to it. This pipeline can
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// be reused.
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//
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// For this pipeline, "next" may be null. If a next pointer is provided, this pipeline will also
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// pass the data through to it and 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 "next".
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//
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// It is okay to keep calling write() after a previous write throws an exception as long as the
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// delegated function allows it.
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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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// The supplied function is called every time write is called.
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QPDF_DLL
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Pl_Function(char const* identifier, Pipeline* next, writer_t fn);
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// The supplied C-style function is called every time write is called. The udata option is
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// passed into the function with each call. If the function returns a non-zero value, a runtime
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// error is thrown.
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typedef int (*writer_c_t)(unsigned char const*, size_t, void*);
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QPDF_DLL
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Pl_Function(char const* identifier, Pipeline* next, writer_c_t fn, void* udata);
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typedef int (*writer_c_char_t)(char const*, size_t, void*);
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QPDF_DLL
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Pl_Function(char const* identifier, Pipeline* next, writer_c_char_t fn, void* udata);
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QPDF_DLL
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~Pl_Function() override;
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QPDF_DLL
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void write(unsigned char const* buf, size_t len) override;
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QPDF_DLL
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void finish() override;
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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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