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Edit File: zip_set_file_compression.3

.\" zip_set_file_compression.mdoc -- set compression method and its flags .\" Copyright (C) 2012-2019 Dieter Baron and Thomas Klausner .\" .\" This file is part of libzip, a library to manipulate ZIP files. .\" The authors can be contacted at <libzip@nih.at> .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in .\" the documentation and/or other materials provided with the .\" distribution. .\" 3. The names of the authors may not be used to endorse or promote .\" products derived from this software without specific prior .\" written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS .\" OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED .\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY .\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE .\" GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS .\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER .\" IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR .\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN .\" IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. .\" .Dd December 18, 2017 .Dt ZIP_SET_FILE_COMPRESSION 3 .Os .Sh NAME .Nm zip_set_file_compression .Nd set compression method for file in zip .Sh LIBRARY libzip (-lzip) .Sh SYNOPSIS .In zip.h .Ft int .Fn zip_set_file_compression "zip_t *archive" "zip_uint64_t index" "zip_int32_t comp" "zip_uint32_t comp_flags" .Sh DESCRIPTION The .Fn zip_set_file_compression function sets the compression method for the file at position .Ar index in the zip archive to .Ar comp with the compression method specific .Ar comp_flags . The .Ar comp is the same as returned by .Xr zip_stat 3 . For the .Ar comp argument, currently only the following values are supported: .Bl -tag -width ZIP_CM_DEFLATE_XX .It Dv ZIP_CM_DEFAULT default compression; currently the same as .Dv ZIP_CM_DEFLATE , but .Ar flags are ignored. .It Dv ZIP_CM_STORE Store the file uncompressed. .It Dv ZIP_CM_BZIP2 Compress the file using the .Xr bzip2 1 algorithm. .It Dv ZIP_CM_DEFLATE Deflate the file with the .Xr zlib 3 algorithm and default options. .El .Pp .Em NOTE : Only the deflate and store methods can be assumed to be universally supported. .Pp The .Ar comp_flags argument defines the compression level, 1 being fastest compression and 9 highest. Allowed values are 0 (which uses the default compression for the algorithm) and 1-9, other values are undefined. Further compression method specific flags might be added over time. .Pp The current compression method for a file in a zip archive can be determined using .Xr zip_stat 3 . .Sh RETURN VALUES Upon successful completion 0 is returned. Otherwise, \-1 is returned and the error information in .Ar archive is set to indicate the error. .Sh ERRORS .Fn zip_set_file_compression fails if: .Bl -tag -width Er .It Bq Er ZIP_ER_COMPNOTSUPP Unsupported compression method requested. .It Bq Er ZIP_ER_INVAL .Ar index is not a valid file index in .Ar archive , or the argument combination is invalid. .It Bq Er ZIP_ER_RDONLY Read-only zip file, no changes allowed. .El .Sh SEE ALSO .Xr libzip 3 , .Xr zip_stat 3 .Sh HISTORY .Fn zip_set_file_compression was added in libzip 0.11. .Sh AUTHORS .An -nosplit .An Dieter Baron Aq Mt dillo@nih.at and .An Thomas Klausner Aq Mt tk@giga.or.at