Decoding of DOS Attributes in External Attributes is wrong & incomplete

[pmqs]

First 16 bits of the decoded External Attributes in Central header should map to DOS attributes. Decoding of this field uses an incorrect and incomplete bitmask

Code uses 0x0100 for Offline, 0x200 for Not Indexed & and 0x400 for Encrypted. Values should be 0x1000, 0x2000 and 0x4000 respectively.

The field names for the 0x0100, 0x0200, 0x0400 and 0x0800 value should be Temporary, Sparse, Reparse Point and Compressed.

In practice the 0x4000 and 0x8000 bits are used for a different purpose.

7z/p7zip uses the 0x8000 bit to signal that the high 16-bits are Unix attributes.

Mac/iOS uses 0x4000 bit for some unknown purpose.

References

• https://learn.microsoft.com/en-us/windows/win32/fileio/file-attribute-constants
• https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-smb/65e0c225-5925-44b0-8104-6b91339c709f