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// 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_BUFFER_HH
#define PL_BUFFER_HH
// This pipeline accumulates the data passed to it into a memory buffer. Each subsequent use of
// this buffer appends to the data accumulated so far. getBuffer() may be called only after calling
// finish() and before calling any subsequent write(). At that point, a dynamically allocated
// Buffer object is returned and the internal buffer is reset. The caller is responsible for
// deleting the returned Buffer.
//
// For this pipeline, "next" may be null. If a next pointer is provided, this pipeline will also
// pass the data through to it.
#include <qpdf/Buffer.hh>
#include <qpdf/Pipeline.hh>
#include <qpdf/PointerHolder.hh> // unused -- remove in qpdf 12 (see #785)
#include <memory>
#include <vector>
class QPDF_DLL_CLASS Pl_Buffer: public Pipeline
{
public:
QPDF_DLL
Pl_Buffer(char const* identifier, Pipeline* next = nullptr);
QPDF_DLL
~Pl_Buffer() override;
QPDF_DLL
void write(unsigned char const*, size_t) override;
QPDF_DLL
void finish() override;
// Each call to getBuffer() resets this object -- see notes above.
// The caller is responsible for deleting the returned Buffer object. See also
// getBufferSharedPointer() and getMallocBuffer().
QPDF_DLL
Buffer* getBuffer();
// Same as getBuffer but wraps the result in a shared pointer.
QPDF_DLL
std::shared_ptr<Buffer> getBufferSharedPointer();
// getMallocBuffer behaves in the same was as getBuffer except the buffer is allocated with
// malloc(), making it suitable for use when calling from other languages. If there is no data,
// *buf is set to a null pointer and *len is set to 0. Otherwise, *buf is a buffer of size *len
// allocated with malloc(). It is the caller's responsibility to call free() on the buffer.
QPDF_DLL
void getMallocBuffer(unsigned char** buf, size_t* len);
private:
class QPDF_DLL_PRIVATE Members
{
friend class Pl_Buffer;
public:
QPDF_DLL
~Members() = default;
private:
Members() = default;
Members(Members const&) = delete;
bool ready{true};
std::vector<unsigned char> data;
};
std::shared_ptr<Members> m;
};
#endif // PL_BUFFER_HH
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