View source for Zoo filter format

{{FormatInfo
|formattype=electronic
|subcat=Compression
|released=1988
}}
'''Zoo filter format''' is a compressed file format related to the [[Zoo]] archive format. It is a streamable format, intended to be used e.g. in Unix-style pipes.

Support for it was introduced in Zoo 2.00, as a compile-time option. It does not appear to be enabled in the DOS releases of Zoo.

The filter format is distinct from [[Zoo Z format]].

Refer to the [[Zoo]] article for information related to the Zoo format and software.

== Discussion ==
The format is a simple container format consisting of a two-byte signature, then the compressed data, then a [[CRC]].

The compression method is either LZD or LZH. It is not recorded in the datastream. You must use the "<code>h</code>" option to compress or decompress LZH.

To compress, use "<code>zoo fc</code>" or "<code>zoo fch</code>". To decompress, use "<code>zoo fu</code>" or "<code>zoo fuh</code>".

== Identification ==
Files start with bytes {{magic|32 5a}}.

== Software ==
Refer to [[Zoo#Software]].