Set compression method for file in zip
libzip (-lzip)
#include <zip.h>
int
zip_set_file_compression(struct zip *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_DEFAULT
default compression; currently the same as ZIP_CM_DEFLATE.
ZIP_CM_STORE
Store the file uncompressed.
ZIP_CM_DEFLATE
Deflate the file with the zlib(3) algorithm and default options
The comp_flags argument is currently ignored.
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_INVAL]
index is not a valid file index in archive, or the argument combination is invalid.
[ZIP_ER_COMPNOTSUPP]
Unsupported compression method requested.
[ZIP_ER_RDONLY]
Read-only zip file, no changes allowed.
Dieter Baron <[email protected]> and Thomas Klausner <[email protected]>