Compress files for flash filesystems


deflate [-div] [-b size] [-o fname] [-t 1|2] [filename]...

Runs on:

QNX Neutrino, Linux, Microsoft Windows


-b size
The compression block size; one of 4 KB, 8 KB, 16 KB, or 32 KB (default: 8 KB). The K is assumed; you don't need to specify it.
Decompress (the same as -i so it can be used as a filter by tar).
Inflate files (default: deflate).
-o fname
The output filename. A filename of - means standard output. By default, deflate compresses the files in place.
-t 1|2
The compression type; the default is 2. For a comparison of the types, see below.
Be verbose; list information on each file as it's compressed.
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.


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:

Type Compression Speed Decompression Speed Compression Amount
1 Fast Very fast 30% on executables
2 Slow Fast 45% on executables


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 a file without changing the input file:

deflate -o file.dfl file