Manpages - zip_set_file_compression.3

libzip (-lzip)

The

function sets the compression method for the file at position

in the zip archive to

with the compression method specific

The

is the same as returned by

For the

argument, currently only the following values are supported:

default compression; currently the same as

but

are ignored.

Store the file uncompressed.

Compress the file using the

algorithm.

Deflate the file with the

algorithm and default options.

Use the

algorithm for compression

Use the

algorithm for compression

Only the deflate and store methods can be assumed to be universally supported.

The

argument defines the compression level. This value is dependent on the compression algorithm. In general, lower numbers mean faster de/compression and higher numbers mean slower de/compression. For

and

1 is the fastest compression and 9 the best, 0 chooses the default. For

possible values are

to

Further compression method specific flags might be added over time.

The current compression method for a file in a zip archive can be determined using

Upon successful completion 0 is returned. Otherwise, -1 is returned and the error information in

is set to indicate the error.

fails if:

Unsupported compression method requested.

is not a valid file index in

or the argument combination is invalid.

Read-only zip file, no changes allowed.

was added in libzip 0.11.

and