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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "compressionconfig.h"
#include "buffer.h"
#include "alloc.h"
namespace vespalib { class DataBuffer; }
namespace vespalib::compression {
class ICompressor
{
public:
virtual ~ICompressor() { }
virtual bool process(CompressionConfig config, const void * input, size_t inputLen, void * output, size_t & outputLen) = 0;
virtual bool unprocess(const void * input, size_t inputLen, void * output, size_t & outputLen) = 0;
virtual size_t adjustProcessLen(uint16_t options, size_t len) const = 0;
};
/**
* Will try to compress a buffer according to the config. If the criteria can not
* be met it will return NONE and dest will get the input buffer.
* @param compression is config for how to compress and what criteria to meet.
* @param org is the original input buffer.
* @param dest is the destination buffer. The compressed data will be appended unless allowSwap is true
* and it is not compressable. Then it will be swapped in.
* @param allowSwap will tell it the data must be appended or if it can be swapped in if it is uncompressable or config is NONE.
*/
CompressionConfig::Type compress(CompressionConfig::Type compression, const ConstBufferRef & org, DataBuffer & dest, bool allowSwap);
CompressionConfig::Type compress(CompressionConfig compression, const vespalib::ConstBufferRef & org, vespalib::DataBuffer & dest, bool allowSwap);
/**
* Will try to decompress a buffer according to the config.
* be met it will return NONE and dest will get the input buffer.
* @param compression is the compression type used for the buffer.
* @param uncompressedLen is the length of the uncompressed data.
* @param org is the original input buffer.
* @param dest is the destination buffer. The decompressed data will be
* appended unless allowSwap is true and compression is NONE.
* Then it will be swapped in.
* @param allowSwap will tell it the data must be appended or if it can be swapped in if compression type is NONE.
*/
void decompress(CompressionConfig::Type compression, size_t uncompressedLen, const vespalib::ConstBufferRef & org, vespalib::DataBuffer & dest, bool allowSwap);
size_t computeMaxCompressedsize(CompressionConfig::Type type, size_t uncompressedSize);
//-----------------------------------------------------------------------------
/**
* Simple utility used to compress data according to a compression
* configuration.
**/
class Compress {
private:
alloc::Alloc _space;
CompressionConfig::Type _type;
const char *_data;
size_t _size;
public:
Compress(CompressionConfig config, const char *uncompressed_data, size_t uncompressed_size);
CompressionConfig::Type type() const { return _type; }
const char *data() const { return _data; }
size_t size() const { return _size; }
};
/**
* Simple utility used to decompress data using additional information
* about compression type and uncompressed size.
**/
class Decompress {
private:
alloc::Alloc _space;
const char *_data;
size_t _size;
public:
Decompress(CompressionConfig::Type type, size_t uncompressed_size,
const char *compressed_data, size_t compressed_size);
const char *data() const { return _data; }
size_t size() const { return _size; }
};
//-----------------------------------------------------------------------------
}
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