deflate

Compress files for flash filesystems

Syntax:

deflate [options] [filename]...

Options:

-b size

The compression block size; one of 4K, 8K, 16K or 32K (default: 8K). The K is assumed; you don't need to specify it.

-o fname

The output filename. A filename of - means standard output. By default, deflate compresses the files in place.

-i

Inflate files (default: deflate).

-p num

Skip compression if a compression rate of num isn't achieved (default: 15%).

-t 1|2

The compression type; the default is 2. For a comparison of the types, see below.

-v

Be verbose; list information on each file as it's compressed.

filename...

The files to compress. If no files are given and the -i option is specified, deflate reads from standard input and writes to standard output, allowing it to be used as a filter.

Description:

The deflate utility compresses files for a flash filesystem. It's intended to be used in conjunction with the filter attribute for mkefs. It can also be used to precompress files intended for a flash filesystem.

The compression types (specified with the -t option) are:

Examples:

Deflate all executables that are to be placed on an embedded target:

deflate -v /target/bin/* /target/lib/*

Inflate a previously deflated file:

deflate -i deflated_file

Deflate file without changing the input file:

deflate -o file.dfl file

Deflate only those files that are reduced in size by 30% or more:

deflate -vp30 /target/readonly_data/*

See also:

inflator

"Flash filesystems (devf-*)" in the Utilities Summary