mirror of https://github.com/qpdf/qpdf.git
90 lines
2.7 KiB
C++
90 lines
2.7 KiB
C++
// Copyright (c) 2005-2023 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
|