| ZIP_SET_FILE_COMPRESSION(3) | Library Functions Manual | ZIP_SET_FILE_COMPRESSION(3) | 
zip_set_file_compression —
#include <zip.h>
int
  
  zip_set_file_compression(zip_t
    *archive, zip_uint64_t
    index, zip_int32_t
    comp, zip_uint32_t
    comp_flags);
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_DEFAULTZIP_CM_DEFLATE, but flags
      are ignored.ZIP_CM_STOREZIP_CM_BZIP2ZIP_CM_DEFLATEZIP_CM_XZZIP_CM_ZSTDNOTE: 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).
zip_set_file_compression() fails if:
ZIP_ER_COMPNOTSUPP]ZIP_ER_INVAL]ZIP_ER_RDONLY]zip_set_file_compression() was added in libzip 0.11.
| February 2, 2023 | NiH |