89 lines
1.8 KiB
C++
89 lines
1.8 KiB
C++
/***
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Copyright (C) 2021 J Reece Wilson (a/k/a "Reece"). All rights reserved.
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File: Compression.hpp
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Date: 2021-6-17
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Author: Reece
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***/
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#pragma once
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namespace Aurora::Compression
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{
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static const AuUInt64 kChunkSize = 4096;
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/// * compression type + bits -> internal zlib windowBits
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static bool CompressionLevelFromExternalApi(const DecompressInfo &info, AuInt8 &out)
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{
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out = 0;
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if (info.hasWindowbits)
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{
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if (info.windowBits < 0)
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{
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return {};
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}
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if (info.windowBits > 15)
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{
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return {};
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}
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}
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if (info.alg == ECompresionType::eGZip)
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{
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if (!info.hasWindowbits)
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{
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return {};
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}
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out = info.windowBits | 16;
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}
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else if (info.alg == ECompresionType::eDeflate)
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{
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if (!info.hasWindowbits)
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{
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return {};
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}
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out = 0 - info.windowBits;
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}
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else
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{
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out = info.windowBits;
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}
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return true;
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}
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/// * compression type + bits -> internal zlib windowBits
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static bool CompressionLevelFromExternalApi(const CompressionInfo &info, AuInt8 &out)
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{
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out = 0;
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if (info.windowBits < 0)
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{
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return {};
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}
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if (info.windowBits > 15)
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{
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return {};
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}
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if (info.type == ECompresionType::eGZip)
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{
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out = info.windowBits | 16;
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}
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else if (info.type == ECompresionType::eDeflate)
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{
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out = 0 - info.windowBits;
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}
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else
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{
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out = info.windowBits;
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}
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return true;
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}
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} |