Pl_QPDFTokenizer.hh
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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_QPDFTOKENIZER_HH
#define PL_QPDFTOKENIZER_HH
#include <qpdf/Pipeline.hh>
#include <qpdf/Pl_Buffer.hh>
#include <qpdf/PointerHolder.hh> // unused -- remove in qpdf 12 (see #785)
#include <qpdf/QPDFObjectHandle.hh>
#include <qpdf/QPDFTokenizer.hh>
#include <memory>
// Tokenize the incoming text using QPDFTokenizer and pass the tokens in turn to a
// QPDFObjectHandle::TokenFilter object. All bytes of incoming content will be included in exactly
// one token and passed downstream.
// This is a very low-level interface for working with token filters. Most code will want to use
// QPDFObjectHandle::filterPageContents or QPDFObjectHandle::addTokenFilter. See QPDFObjectHandle.hh
// for details.
class QPDF_DLL_CLASS Pl_QPDFTokenizer: public Pipeline
{
public:
// Whatever pipeline is provided as "next" will be set as the pipeline that the token filter
// writes to. If next is not provided, any output written by the filter will be discarded.
QPDF_DLL
Pl_QPDFTokenizer(
char const* identifier, QPDFObjectHandle::TokenFilter* filter, Pipeline* next = nullptr);
QPDF_DLL
~Pl_QPDFTokenizer() 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_QPDFTokenizer;
public:
QPDF_DLL
~Members() = default;
private:
Members();
Members(Members const&) = delete;
QPDFObjectHandle::TokenFilter* filter{nullptr};
QPDFTokenizer tokenizer;
Pl_Buffer buf;
};
std::shared_ptr<Members> m;
};
#endif // PL_QPDFTOKENIZER_HH