mirror of https://github.com/oliverbooth/fdup.git
43 lines
1.7 KiB
C#
43 lines
1.7 KiB
C#
using System.Security.Cryptography;
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namespace FindDuplicates;
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internal static class AlgorithmExtensions
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{
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public static int GetByteCount(this Algorithm algorithm)
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{
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return algorithm switch
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{
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Algorithm.Sha512 => SHA512.HashSizeInBytes,
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Algorithm.Sha384 => SHA384.HashSizeInBytes,
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Algorithm.Sha256 => SHA256.HashSizeInBytes,
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Algorithm.Sha3512 => SHA3_512.HashSizeInBytes,
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Algorithm.Sha3384 => SHA3_384.HashSizeInBytes,
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Algorithm.Sha3256 => SHA3_256.HashSizeInBytes,
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Algorithm.Sha1 => SHA1.HashSizeInBytes,
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Algorithm.Md5 => MD5.HashSizeInBytes,
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_ => 0
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};
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}
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public static int HashData(this Algorithm algorithm, Stream source, Span<byte> destination)
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{
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// I'd love to use a dictionary to cache the function map, but you can't use Span<> as a type argument,
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// probably due to the fact that a lambda heap allocs, and we can't have that for ref structs, oh no (!)
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// so enjoy this absolutely cursed switch expression which checks each algorithm separately. I hate it too.
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return algorithm switch
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{
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Algorithm.Sha512 => SHA512.HashData(source, destination),
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Algorithm.Sha384 => SHA384.HashData(source, destination),
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Algorithm.Sha256 => SHA256.HashData(source, destination),
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Algorithm.Sha3512 => SHA3_512.HashData(source, destination),
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Algorithm.Sha3384 => SHA3_384.HashData(source, destination),
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Algorithm.Sha3256 => SHA3_256.HashData(source, destination),
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Algorithm.Sha1 => SHA1.HashData(source, destination),
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Algorithm.Md5 => MD5.HashData(source, destination),
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_ => -1
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};
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}
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}
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