The AdvanceDEFLATE recompression utility

1 Synopsis

advdef [-z, --recompress] [-0, --shrink-store]
[-1, --shrink-fast] [-2, --shrink-normal] [-3, --shrink-extra]
[-4, --shrink-insane] [-f, --force] [-q, --quiet]
[-h, --help] [-V, --version] FILES...

2 Description

The main purpose of this utility is to recompress the data present in the .png, .mng and .gz files.

The internal structure of the files isn't changed. Only the compressed data is modified.

3 Options

-z, --recompress FILES...

Recompress the specified files. If the -1, -2, -3, -4 options are specified it's used the smallest file choice from the previous compressed data and the new compression. If the -0 option is specified the file is always rewritten without any compression.

-0, --shrink-store

Disable the compression. The file is only stored and not compressed. The file is always rewritten also if it's bigger.

-1, --shrink-fast

Set the compression level to "fast".

-2, --shrink-normal

Set the compression level to "normal". This is the default level of compression.

-3, --shrink-extra

Set the compression level to "extra".

-4, --shrink-insane

Set the compression level to "insane". It's VERY SLOW.

-f, --force

Force the use of the new file also if it's bigger.

4 Limitations

The advdef program cannot be used to recompress huge files because it needs to allocate memory for both the complete compressed and uncompressed data.

5 Copyright

6 See Also

advpng(1), advmng(1), advzip(1), gzip(1), bzip2(1)