third_party/libzip/src/man/zip_set_file_compression.html
| ZIP_SET_FILE_COMPRESSION(3) | Library Functions Manual | ZIP_SET_FILE_COMPRESSION(3) |
zip_set_file_compression —
set compression method for file in zip
libzip (-lzip)
#include <zip.h>
int
zip_set_file_compression(zip_t *archive, zip_uint64_t index, zip_int32_t comp, zip_uint32_t comp_flags);
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_DEFAULTdefault compression; currently the same as ZIP_CM_DEFLATE, but flags are ignored.ZIP_CM_STOREStore the file uncompressed.ZIP_CM_BZIP2Compress the file using the bzip2(1) algorithm.ZIP_CM_DEFLATEDeflate the file with the zlib(3) algorithm and default options.
NOTE: Only the deflate and store methods can be assumed to be universally supported.
The 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.
The current compression method for a file in a zip archive can be determined using zip_stat(3).
Upon successful completion 0 is returned. Otherwise, -1 is returned and the error information in archive is set to indicate the error.
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.
libzip(3), zip_compression_method_supported(3), zip_stat(3)
zip_set_file_compression() was added in libzip 0.11.
Dieter Baron <[email protected]> and Thomas Klausner <[email protected]>
| April 2, 2020 | NiH |