Man page - zip_set_file_compression(3)
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apt-get install libzip-dev
Manual
ZIP_SET_FILE_COMPRESSION (3) Library Functions Manual ZIP_SET_FILE_COMPRESSION (3)
NAME
zip_set_file_compression — set compression method for file in zip
LIBRARY
libzip (-lzip)
SYNOPSIS
#include <zip.h>
int
zip_set_file_compression ( zip_t *archive , zip_uint64_t index , zip_int32_t comp , zip_uint32_t comp_flags );
DESCRIPTION
The zip_set_file_compression () function sets the compression method for the file at position index in the zip archive to comp with the compression method specific comp_flags . The comp is the same as returned by zip_stat (3). For the comp argument, currently only the following values are supported:
ZIP_CM_DEFAULT
default compression; currently the same as ZIP_CM_DEFLATE, but flags are ignored.
ZIP_CM_STORE
Store the file uncompressed.
ZIP_CM_BZIP2
Compress the file using the bzip2 (1) algorithm.
ZIP_CM_DEFLATE
Deflate the file with the zlib (3) algorithm and default options.
ZIP_CM_XZ
Use the xz (1) algorithm for compression
ZIP_CM_ZSTD
Use the zstd (1) algorithm for compression
NOTE : Only the deflate and store methods can be assumed to be universally supported.
The comp_flags 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 ZIP_CM_BZIP, ZIP_CM_DEFLATE, and ZIP_CM_XZ 1 is the fastest compression and 9 the best, 0 chooses the default. For ZIP_CM_ZSTD possible values are ZSTD_minCLevel (3) to ZSTD_maxCLevel (3); negative values must be cast to zip_uint32_t .
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 zip_stat (3).
RETURN VALUES
Upon successful completion 0 is returned. Otherwise, -1 is returned and the error information in archive is set to indicate the error.
ERRORS
zip_set_file_compression () fails if:
[ZIP_ER_COMPNOTSUPP]
Unsupported compression method requested.
[ZIP_ER_INVAL]
index is not a valid file index in archive , or the argument combination is invalid.
[ZIP_ER_RDONLY]
Read-only zip file, no changes allowed.
SEE ALSO
libzip (3), zip_compression_method_supported (3), zip_stat (3)
HISTORY
zip_set_file_compression () was added in libzip 0.11.
AUTHORS
Dieter Baron < dillo@nih.at > and Thomas Klausner < wiz@gatalith.at > Debian February 2, 2023 ZIP_SET_FILE_COMPRESSION (3)