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// Copyright (c) 2005-2024 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.
#ifndef PL_FUNCTION_HH
#define PL_FUNCTION_HH
// This pipeline calls an arbitrary function with whatever data is passed to it. This pipeline can
// be reused.
//
// For this pipeline, "next" may be null. If a next pointer is provided, this pipeline will also
// pass the data through to it and will forward finish() to it.
//
// It is okay to not call finish() on this pipeline if it has no "next".
//
// It is okay to keep calling write() after a previous write throws an exception as long as the
// delegated function allows it.
#include <qpdf/Pipeline.hh>
#include <functional>
class QPDF_DLL_CLASS Pl_Function: public Pipeline
{
public:
typedef std::function<void(unsigned char const*, size_t)> writer_t;
// The supplied function is called every time write is called.
QPDF_DLL
Pl_Function(char const* identifier, Pipeline* next, writer_t fn);
// The supplied C-style function is called every time write is called. The udata option is
// passed into the function with each call. If the function returns a non-zero value, a runtime
// error is thrown.
typedef int (*writer_c_t)(unsigned char const*, size_t, void*);
QPDF_DLL
Pl_Function(char const* identifier, Pipeline* next, writer_c_t fn, void* udata);
typedef int (*writer_c_char_t)(char const*, size_t, void*);
QPDF_DLL
Pl_Function(char const* identifier, Pipeline* next, writer_c_char_t fn, void* udata);
QPDF_DLL
~Pl_Function() override;
QPDF_DLL
void write(unsigned char const* buf, size_t len) override;
QPDF_DLL
void finish() override;
private:
class QPDF_DLL_PRIVATE Members
{
friend class Pl_Function;
public:
QPDF_DLL
~Members() = default;
private:
Members(writer_t);
Members(Members const&) = delete;
writer_t fn;
};
std::shared_ptr<Members> m;
};
#endif // PL_FUNCTION_HH
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