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|---|---|---|---|
| 1 | // SPDX-FileCopyrightText: 2022-2023 Dennis Gläser <dennis.glaeser@iws.uni-stuttgart.de> | ||
| 2 | // SPDX-License-Identifier: MIT | ||
| 3 | /*! | ||
| 4 | * \file | ||
| 5 | * \ingroup Compression | ||
| 6 | * \brief Decompress compressed data. | ||
| 7 | */ | ||
| 8 | #ifndef GRIDFORMAT_COMPRESSION_DECOMPRESS_HPP_ | ||
| 9 | #define GRIDFORMAT_COMPRESSION_DECOMPRESS_HPP_ | ||
| 10 | |||
| 11 | #include <string> | ||
| 12 | |||
| 13 | #include <gridformat/common/exceptions.hpp> | ||
| 14 | #include <gridformat/common/serialization.hpp> | ||
| 15 | |||
| 16 | #include <gridformat/compression/concepts.hpp> | ||
| 17 | #include <gridformat/compression/common.hpp> | ||
| 18 | |||
| 19 | namespace GridFormat::Compression { | ||
| 20 | |||
| 21 | /*! | ||
| 22 | * \ingroup Compression | ||
| 23 | * \brief Decompress compressed data. | ||
| 24 | */ | ||
| 25 | template<std::integral HeaderType, Concepts::BlockDecompressor Decompressor> | ||
| 26 | 14518 | void decompress(Serialization& in, | |
| 27 | const CompressedBlocks<HeaderType>& blocks, | ||
| 28 | const Decompressor& block_decompressor) { | ||
| 29 | using Byte = typename Decompressor::ByteType; | ||
| 30 | |||
| 31 |
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14518 | const auto last_block_size = blocks.residual_block_size > 0 ? blocks.residual_block_size : blocks.block_size; |
| 32 | 14518 | const auto out_size = blocks.block_size*(blocks.number_of_blocks-1) + last_block_size; | |
| 33 | |||
| 34 | 14518 | std::size_t in_offset = 0; | |
| 35 | 14518 | std::size_t out_offset = 0; | |
| 36 |
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14518 | Serialization out{out_size}; |
| 37 | |||
| 38 |
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14518 | const auto* in_data = in.template as_span_of<const Byte>().data(); |
| 39 |
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14518 | auto* out_data = out.template as_span_of<Byte>().data(); |
| 40 |
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28880 | std::ranges::for_each(std::views::iota(HeaderType{0}, blocks.number_of_blocks), [&] (HeaderType i) { |
| 41 |
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7193 | const auto out_block_size = (i == blocks.number_of_blocks - 1) ? last_block_size : blocks.block_size; |
| 42 | |||
| 43 |
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7193 | block_decompressor( |
| 44 | 7193 | std::span{in_data + in_offset, blocks.compressed_block_sizes[i]}, | |
| 45 | 7193 | std::span{out_data + out_offset, out_block_size} | |
| 46 | ); | ||
| 47 | |||
| 48 | 7193 | in_offset += blocks.compressed_block_sizes[i]; | |
| 49 | 7193 | out_offset += out_block_size; | |
| 50 | }); | ||
| 51 |
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14518 | if (out_offset != out.size()) |
| 52 | ✗ | throw SizeError( | |
| 53 | ✗ | "Unexpected number of bytes written: " + std::to_string(out_offset) + " vs. " + std::to_string(out.size()) | |
| 54 | ); | ||
| 55 |
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14518 | in = out; |
| 56 | 14518 | } | |
| 57 | |||
| 58 | } // end namespace GridFormat::Compression | ||
| 59 | |||
| 60 | #endif // GRIDFORMAT_COMPRESSION_DECOMPRESS_HPP_ | ||
| 61 |