zip_file_add - Man Page

add file to zip archive or replace file in zip archive


libzip (-lzip)


#include <zip.h>

zip_file_add(zip_t *archive, const char *name, zip_source_t *source, zip_flags_t flags);

zip_file_replace(zip_t *archive, zip_uint64_t index, zip_source_t *source, zip_flags_t flags);


The function zip_file_add() adds a file to a zip archive, while zip_file_replace() replaces an existing file in a zip archive. The argument archive specifies the zip archive to which the file should be added. name is the file's name in the zip archive (for zip_file_add()), while index specifies which file should be replaced (for zip_file_replace()). The flags argument can be any combination of ZIP_FL_OVERWRITE with one of ZIP_FL_ENC_*:


Overwrite any existing file of the same name. For zip_file_add only.


Guess encoding of name (default). (Only CP-437 and UTF-8 are recognized.)


Interpret name as UTF-8.


Interpret name as code page 437 (CP-437).

The data is obtained from the source argument, see zip_source(3).

NOTE: zip_source_free(3) should not be called on a source after it was used successfully in a zip_file_add or zip_file_replace call.

Return Values

Upon successful completion, zip_file_add() returns the index of the new file in the archive, and zip_file_replace() returns 0. Otherwise, -1 is returned and the error code in archive is set to indicate the error.


zip_source_t *s;
const char buf[]="teststring";

if ((s=zip_source_buffer(archive, buf, sizeof(buf), 0)) == NULL ||
    zip_file_add(archive, name, s, ZIP_FL_ENC_UTF_8) < 0) {
    printf("error adding file: %s\n", zip_strerror(archive));


zip_file_add() and zip_file_replace() fail if:


There is already a file called name in the archive. (Only applies to zip_file_add(), and only if ZIP_FL_OVERWRITE is not provided).


source or name are NULL, or index is invalid.


Required memory could not be allocated.


Archive was opened in read-only mode.

See Also

libzip(3), zip_source(3)


zip_file_add() and zip_file_replace() were added in libzip 0.11.


Dieter Baron <> and Thomas Klausner <>

Referenced By

libzip(3), zip_add(3), zip_dir_add(3), zip_source(3), zip_source_buffer(3), zip_source_buffer_fragment(3), zip_source_file(3), zip_source_filep(3), zip_source_free(3), zip_source_function(3), zip_source_win32a(3), zip_source_win32handle(3), zip_source_win32w(3), zip_source_zip(3).

The man page zip_file_replace(3) is an alias of zip_file_add(3).

September 22, 2020