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Timofey Solomko
38 lines
1.6 KiB
Swift
38 lines
1.6 KiB
Swift
// Copyright (c) 2021 Timofey Solomko
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// Licensed under MIT License
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//
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// See LICENSE for license information
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import Foundation
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/**
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Represents an error which happened while processing a GZip archive.
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It may indicate that either archive is damaged or it might not be GZip archive at all.
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*/
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public enum GzipError: Error {
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/// First two bytes ('magic' number) of archive isn't 31 and 139.
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case wrongMagic
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/// Compression method used in archive is different from Deflate, which is the only supported one.
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case wrongCompressionMethod
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/**
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One of the reserved fields in archive has an unexpected value, which can also mean (apart from damaged archive),
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that archive uses a newer version of GZip format.
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*/
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case wrongFlags
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/// Computed CRC of archive's header doesn't match the value stored in archive.
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case wrongHeaderCRC
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/**
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Computed checksum of uncompressed data doesn't match the value stored in the archive.
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Associated value of the error contains `GzipArchive.Member`s for all already decompressed data:
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+ if `unarchive` function was called then associated array will have only one element,
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since this function always processes only first member of archive.
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+ if `multiUnarchive` function was called then associated array will have an element
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for each already decompressed member, including the one with mismatching checksum.
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*/
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case wrongCRC([GzipArchive.Member])
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/// Computed 'isize' didn't match the value stored in the archive.
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case wrongISize
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/// Either specified file name or comment cannot be encoded using ISO Latin-1 encoding.
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case cannotEncodeISOLatin1
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}
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