ZipLocalFileHeader.cs

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using System.Collections.Generic;
using System.Runtime.InteropServices;
 
namespace System.IO.Compression;
 
[StructLayout(LayoutKind.Sequential, Size = 1)]
internal readonly struct ZipLocalFileHeader
{
    public static List<ZipGenericExtraField> GetExtraFields(BinaryReader reader)
    {
        reader.BaseStream.Seek(26L, SeekOrigin.Current);
        ushort num = reader.ReadUInt16();
        ushort num2 = reader.ReadUInt16();
        reader.BaseStream.Seek(num, SeekOrigin.Current);
        List<ZipGenericExtraField> list;
        using (Stream extraFieldData = new SubReadStream(reader.BaseStream, reader.BaseStream.Position, num2))
        {
            list = ZipGenericExtraField.ParseExtraField(extraFieldData);
        }
        Zip64ExtraField.RemoveZip64Blocks(list);
        return list;
    }
 
    public static bool TrySkipBlock(BinaryReader reader)
    {
        if (reader.ReadUInt32() != 67324752)
        {
            return false;
        }
        if (reader.BaseStream.Length < reader.BaseStream.Position + 22)
        {
            return false;
        }
        reader.BaseStream.Seek(22L, SeekOrigin.Current);
        ushort num = reader.ReadUInt16();
        ushort num2 = reader.ReadUInt16();
        if (reader.BaseStream.Length < reader.BaseStream.Position + num + num2)
        {
            return false;
        }
        reader.BaseStream.Seek(num + num2, SeekOrigin.Current);
        return true;
    }
}