ZIP_FILE_EXTRA_FIELD_GET(3)ZIP_FILE_EXTRA_FIELD_GET(3)NAME
zip_file_extra_field_get , - .Nm zip_file_extra_field_get_by_id get
extra field for file in zip
LIBRARY
libzip (-lzip)
SYNOPSIS
#include <zip.h>
const zip_uint8_t * zip_file_extra_field_get(struct zip *archive,
zip_uint64_t index); "zip_uint16_t extra_field_index" "zip_uint16_t
*idp" "zip_uint16_t *lenp" "zip_flags_t flags"
const zip_uint8_t * zip_file_extra_field_get_by_id(struct zip *archive,
zip_uint64_t index); "zip_uint16_t extra_field_id" "zip_uint16_t
extra_field_index" "zip_uint16_t *lenp" "zip_flags_t flags"
DESCRIPTION
The zip_file_extra_field_get function returns the extra field with
index extra_field_index for the file at position index in the zip ar‐
chive. This pointer should not be modified or free(3) Ap d, and
becomes invalid when archive is closed. If idp is not NULL, the inte‐
ger to which it points will be set to the ID (two-byte signature) of
the selected extra field. If lenp is not NULL, the integer to which it
points will be set to the length of the extra field. Generally speak‐
ing, lenp and idp should be passed since only the extra field data is
returned (i.e., neither the ID nor the length, if the idp and lenp
arguments are not provided).
The following flags are supported:
ZIP_FL_CENTRAL Return extra fields from the archive's cen‐
tral directory.
ZIP_FL_LOCAL Return extra fields from the local file
headers.
ZIP_FL_UNCHANGED Return the original unchanged extra fields,
ignoring any changes made.
The zip_file_extra_field_get_by_id function returns the extra field
with ID (two-byte signature) extra_field_id and index extra_field_index
(in other words, the extra_field_index'th extra field with ID
extra_field_id ) The other arguments are the same as for
zip_file_extra_field_get.
RETURN VALUES
Upon successful completion, a pointer to an extra field is returned, or
NULL if there is no extra field with that extra_field_index for the
file with index index. In case of an error, NULL is returned and the
error code in archive is set to indicate the error.
ERRORS
zip_file_extra_field_get and zip_file_extra_field_get_by_id fail if:
[ZIP_ER_NOENT]
index is not a valid file index in archive, or
extra_field_index is not a valid extra file index (for ID
extra_field_id ).
SEE ALSOlibzip(3), zip_file_extra_field_delete(3), zip_file_extra_field_set(3),
zip_file_extra_fields_count(3)AUTHORS
Dieter Baron <dillo@nih.at> and Thomas Klausner <tk@giga.or.at>
NiH February 20, 2013 ZIP_FILE_EXTRA_FIELD_GET(3)
