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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license.
#pragma once
#include "seal/util/defines.h"
#if defined(SEAL_USE_ZLIB) || defined(SEAL_USE_ZSTD)
#include "seal/dynarray.h"
#include "seal/memorymanager.h"
#include <ios>
#include <iostream>
namespace seal
{
namespace util
{
namespace ztools
{
/**
Compresses data in the given buffer, completes the given SEALHeader by writing in the size of the output and
setting the compression mode to compr_mode_type::zlib and finally writes the SEALHeader followed by the
compressed data in the given stream.
@param[in] in The buffer to compress
@param[in] in_size The size of the buffer to compress in bytes
@param[out] header A pointer to a SEALHeader instance matching the output of the compression
@param[out] out_stream The stream to write to
@param[in] pool The MemoryPoolHandle pointing to a valid memory pool
@throws std::invalid_argument if pool is uninitialized
@throws std::logic_error if compression failed
*/
void zlib_write_header_deflate_buffer(
DynArray<seal_byte> &in, void *header_ptr, std::ostream &out_stream, MemoryPoolHandle pool);
int zlib_deflate_array_inplace(DynArray<seal_byte> &in, MemoryPoolHandle pool);
int zlib_inflate_stream(
std::istream &in_stream, std::streamoff in_size, std::ostream &out_stream, MemoryPoolHandle pool);
/**
Compresses data in the given buffer, completes the given SEALHeader by writing in the size of the output and
setting the compression mode to compr_mode_type::zstd and finally writes the SEALHeader followed by the
compressed data in the given stream.
@param[in] in The buffer to compress
@param[in] in_size The size of the buffer to compress in bytes
@param[out] header A pointer to a SEALHeader instance matching the output of the compression
@param[out] out_stream The stream to write to
@param[in] pool The MemoryPoolHandle pointing to a valid memory pool
@throws std::invalid_argument if pool is uninitialized
@throws std::logic_error if compression failed
*/
void zstd_write_header_deflate_buffer(
DynArray<seal_byte> &in, void *header_ptr, std::ostream &out_stream, MemoryPoolHandle pool);
unsigned zstd_deflate_array_inplace(DynArray<seal_byte> &in, MemoryPoolHandle pool);
unsigned zstd_inflate_stream(
std::istream &in_stream, std::streamoff in_size, std::ostream &out_stream, MemoryPoolHandle pool);
template <typename SizeT>
SEAL_NODISCARD SizeT zlib_deflate_size_bound(SizeT in_size)
{
return util::add_safe<SizeT>(in_size, in_size >> 12, in_size >> 14, in_size >> 25, SizeT(17));
}
template <typename SizeT>
SEAL_NODISCARD SizeT zstd_deflate_size_bound(SizeT in_size)
{
return util::add_safe<SizeT>(
in_size, in_size >> 8,
(in_size < (SizeT(128) << 10)) ? (((SizeT(128) << 10) - in_size) >> 11) : SizeT(0));
}
} // namespace ztools
} // namespace util
} // namespace seal
#endif