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Add named constants for WinZip AES extra data magic numbers

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Co-authored-by: adamhathcock <527620+adamhathcock@users.noreply.github.com>
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copilot-swe-agent[bot]
2026-02-12 15:47:30 +00:00
parent ebb8f16e44
commit 359b1093bc
1 changed files with 6 additions and 2 deletions
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8
src/SharpCompress/Common/Zip/ZipEntry.cs
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@@ -10,6 +10,10 @@ public class ZipEntry : Entry
{
private readonly ZipFilePart? _filePart;
// WinZip AES extra data constants
private const int MinimumWinZipAesExtraDataLength = 7;
private const int WinZipAesCompressionMethodOffset = 5;
internal ZipEntry(ZipFilePart? filePart, IReaderOptions readerOptions)
: base(readerOptions)
{
@@ -70,7 +74,7 @@ public class ZipEntry : Entry
x.Type == ExtraDataType.WinZipAes
);
if (aesExtraData is null || aesExtraData.DataBytes.Length < 7)
if (aesExtraData is null || aesExtraData.DataBytes.Length < MinimumWinZipAesExtraDataLength)
{
return ZipCompressionMethod.WinzipAes;
}
@@ -78,7 +82,7 @@ public class ZipEntry : Entry
// The compression method is at offset 5 in the extra data
return (ZipCompressionMethod)
System.Buffers.Binary.BinaryPrimitives.ReadUInt16LittleEndian(
aesExtraData.DataBytes.AsSpan(5)
aesExtraData.DataBytes.AsSpan(WinZipAesCompressionMethodOffset)
);
}