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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_FLATE_HH
#define PL_FLATE_HH
#include <qpdf/Pipeline.hh>
#include <functional>
#include <memory>
class QPDF_DLL_CLASS Pl_Flate: public Pipeline
{
public:
static unsigned int const def_bufsize = 65536;
enum action_e { a_inflate, a_deflate };
QPDF_DLL
Pl_Flate(
char const* identifier,
Pipeline* next,
action_e action,
unsigned int out_bufsize = def_bufsize);
QPDF_DLL
~Pl_Flate() override;
QPDF_DLL
void write(unsigned char const* data, size_t len) override;
QPDF_DLL
void finish() override;
// Globally set compression level from 1 (fastest, least
// compression) to 9 (slowest, most compression). Use -1 to set
// the default compression level. This is passed directly to zlib.
// This method returns a pointer to the current Pl_Flate object so
// you can create a pipeline with
// Pl_Flate(...)->setCompressionLevel(...)
QPDF_DLL
static void setCompressionLevel(int);
QPDF_DLL
void setWarnCallback(std::function<void(char const*, int)> callback);
private:
QPDF_DLL_PRIVATE
void handleData(unsigned char const* data, size_t len, int flush);
QPDF_DLL_PRIVATE
void checkError(char const* prefix, int error_code);
QPDF_DLL_PRIVATE
void warn(char const*, int error_code);
QPDF_DLL_PRIVATE
static int compression_level;
class QPDF_DLL_PRIVATE Members
{
friend class Pl_Flate;
public:
QPDF_DLL
~Members();
private:
Members(size_t out_bufsize, action_e action);
Members(Members const&) = delete;
std::shared_ptr<unsigned char> outbuf;
size_t out_bufsize;
action_e action;
bool initialized;
void* zdata;
std::function<void(char const*, int)> callback;
};
unsigned char* inbuf; /* additional buffer for zopfli input */
size_t inbuf_size;
std::shared_ptr<Members> m;
};
#endif // PL_FLATE_HH
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