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// 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.
#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
virtual ~Pl_Function();
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_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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