mirror of https://github.com/qpdf/qpdf.git
89 lines
2.8 KiB
C++
89 lines
2.8 KiB
C++
// Copyright (c) 2005-2022 Jay Berkenbilt
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//
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// This file is part of qpdf.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Versions of qpdf prior to version 7 were released under the terms
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// of version 2.0 of the Artistic License. At your option, you may
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// continue to consider qpdf to be licensed under those terms. Please
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// see the manual for additional information.
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#ifndef PL_BUFFER_HH
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#define PL_BUFFER_HH
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// This pipeline accumulates the data passed to it into a memory
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// buffer. Each subsequent use of this buffer appends to the data
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// accumulated so far. getBuffer() may be called only after calling
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// finish() and before calling any subsequent write(). At that point,
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// a dynamically allocated Buffer object is returned and the internal
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// buffer is reset. The caller is responsible for deleting the
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// returned Buffer.
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//
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// For this pipeline, "next" may be null. If a next pointer is
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// provided, this pipeline will also pass the data through to it.
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#include <qpdf/Pipeline.hh>
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#include <qpdf/PointerHolder.hh>
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#include <qpdf/Buffer.hh>
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class Pl_Buffer: public Pipeline
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{
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public:
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QPDF_DLL
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Pl_Buffer(char const* identifier, Pipeline* next = 0);
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QPDF_DLL
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virtual ~Pl_Buffer();
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QPDF_DLL
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virtual void write(unsigned char*, size_t);
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QPDF_DLL
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virtual void finish();
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// Each call to getBuffer() resets this object -- see notes above.
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// The caller is responsible for deleting the returned Buffer
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// object.
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QPDF_DLL
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Buffer* getBuffer();
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// getMallocBuffer behaves in the same was as getBuffer except the
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// buffer is allocated with malloc(), making it suitable for use
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// when calling from other languages. If there is no data, *buf is
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// set to a null pointer and *len is set to 0. Otherwise, *buf is
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// a buffer of size *len allocated with malloc(). It is the
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// caller's responsibility to call free() on the buffer.
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QPDF_DLL
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void getMallocBuffer(unsigned char **buf, size_t* len);
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private:
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class Members
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{
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friend class Pl_Buffer;
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public:
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QPDF_DLL
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~Members();
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private:
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Members();
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Members(Members const&);
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bool ready;
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PointerHolder<Buffer> data;
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size_t total_size;
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};
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PointerHolder<Members> m;
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};
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#endif // PL_BUFFER_HH
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