1 .\" zip_set_file_compression.mdoc -- set compression method and its flags
2 .\" Copyright (C) 2012-2017 Dieter Baron and Thomas Klausner
4 .\" This file is part of libzip, a library to manipulate ZIP files.
5 .\" The authors can be contacted at <libzip@nih.at>
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33 .Dt ZIP_SET_FILE_COMPRESSION 3
36 .Nm zip_set_file_compression
37 .Nd set compression method for file in zip
43 .Fn zip_set_file_compression "zip_t *archive" "zip_uint64_t index" "zip_int32_t comp" "zip_uint32_t comp_flags"
46 .Fn zip_set_file_compression
47 function sets the compression method for the file at position
51 with the compression method specific
55 is the same as returned by
59 argument, currently only the following values are supported:
60 .Bl -tag -width ZIP_CM_DEFLATE_XX
62 default compression; currently the same as
65 Store the file uncompressed.
67 Compress the file using the
71 Deflate the file with the
73 algorithm and default options
77 Only the deflate and store methods can be assumed to be universally
82 argument defines the compression level, 1 being fastest compression
84 Allowed values are 0 (which uses the default compression for the
85 algorithm) and 1-9, other values are undefined.
86 Further compression method specific flags might be added over time.
88 The current compression method for a file in a zip archive can be
92 Upon successful completion 0 is returned.
93 Otherwise, \-1 is returned and the error information in
95 is set to indicate the error.
97 .Fn zip_set_file_compression
100 .It Bq Er ZIP_ER_COMPNOTSUPP
101 Unsupported compression method requested.
102 .It Bq Er ZIP_ER_INVAL
104 is not a valid file index in
106 or the argument combination is invalid.
107 .It Bq Er ZIP_ER_RDONLY
108 Read-only zip file, no changes allowed.
114 .Fn zip_set_file_compression
115 was added in libzip 0.11.
118 .An Dieter Baron Aq Mt dillo@nih.at
120 .An Thomas Klausner Aq Mt tk@giga.or.at