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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 QPDF_CLOSEDFILEINPUTSOURCE_HH
#define QPDF_CLOSEDFILEINPUTSOURCE_HH
// This is an input source that reads from files, like
// FileInputSource, except that it opens and close the file
// surrounding every operation. This decreases efficiency, but it allows
// many more of these to exist at once than the maximum number of open
// file descriptors. This is used for merging large numbers of files.
#include <qpdf/InputSource.hh>
#include <qpdf/PointerHolder.hh>
#include <memory>
class FileInputSource;
class QPDF_DLL_CLASS ClosedFileInputSource: public InputSource
{
public:
QPDF_DLL
ClosedFileInputSource(char const* filename);
QPDF_DLL
virtual ~ClosedFileInputSource();
QPDF_DLL
virtual qpdf_offset_t findAndSkipNextEOL();
QPDF_DLL
virtual std::string const& getName() const;
QPDF_DLL
virtual qpdf_offset_t tell();
QPDF_DLL
virtual void seek(qpdf_offset_t offset, int whence);
QPDF_DLL
virtual void rewind();
QPDF_DLL
virtual size_t read(char* buffer, size_t length);
QPDF_DLL
virtual void unreadCh(char ch);
// The file stays open between calls to stayOpen(true) and
// stayOpen(false). You can use this to surround multiple
// operations on a single ClosedFileInputSource to reduce the
// overhead of a separate open/close on each call.
QPDF_DLL
void stayOpen(bool);
private:
ClosedFileInputSource(ClosedFileInputSource const&) = delete;
ClosedFileInputSource& operator=(ClosedFileInputSource const&) = delete;
QPDF_DLL_PRIVATE
void before();
QPDF_DLL_PRIVATE
void after();
std::string filename;
qpdf_offset_t offset;
std::shared_ptr<FileInputSource> fis;
bool stay_open;
};
#endif // QPDF_CLOSEDFILEINPUTSOURCE_HH
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