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5d4cad9c02
Significantly improve the code's use of off_t for file offsets, size_t for memory sizes, and integer types in cases where there has to be compatibility with external interfaces. Rework sections of the code that would have prevented qpdf from working on files larger than 2 (or maybe 4) GB in size.
66 lines
2.1 KiB
C++
66 lines
2.1 KiB
C++
// Copyright (c) 2005-2011 Jay Berkenbilt
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//
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// This file is part of qpdf. This software may be distributed under
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// the terms of version 2 of the Artistic License which may be found
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// in the source distribution. It is provided "as is" without express
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// or implied warranty.
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// Generalized Pipeline interface. By convention, subclasses of
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// Pipeline are called Pl_Something.
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//
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// When an instance of Pipeline is created with a pointer to a next
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// pipeline, that pipeline writes its data to the next one when it
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// finishes with it. In order to make possible a usage style in which
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// a pipeline may be passed to a function which may stick other
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// pipelines in front of it, the allocator of a pipeline is
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// responsible for its destruction. In other words, one pipeline
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// object does not attempt to manage the memory of its successor.
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//
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// The client is required to call finish() before destroying a
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// Pipeline in order to avoid loss of data. A Pipeline class should
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// not throw an exception in the destructor if this hasn't been done
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// though since doing so causes too much trouble when deleting
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// pipelines during error conditions.
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//
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// Some pipelines are reusable (i.e., you can call write() after
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// calling finish() and can call finish() multiple times) while others
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// are not. It is up to the caller to use a pipeline according to its
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// own restrictions.
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#ifndef __PIPELINE_HH__
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#define __PIPELINE_HH__
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#include <qpdf/DLL.h>
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#include <string>
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class Pipeline
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{
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public:
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QPDF_DLL
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Pipeline(char const* identifier, Pipeline* next);
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QPDF_DLL
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virtual ~Pipeline();
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// Subclasses should implement write and finish to do their jobs
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// and then, if they are not end-of-line pipelines, call
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// getNext()->write or getNext()->finish.
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QPDF_DLL
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virtual void write(unsigned char* data, size_t len) = 0;
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QPDF_DLL
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virtual void finish() = 0;
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protected:
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Pipeline* getNext(bool allow_null = false);
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std::string identifier;
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private:
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// Do not implement copy or assign
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Pipeline(Pipeline const&);
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Pipeline& operator=(Pipeline const&);
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Pipeline* next;
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};
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#endif // __PIPELINE_HH__
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