zip_file_extra_field_get_by_id - get extra field for file in zip
#include <zip.h> const zip_uint8_t * zip_file_extra_field_get(zip_t *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(zip_t *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);
ZIP_FILE_EXTRA_FIELD_... BSD Library Functions Manual ZIP_FILE_EXTRA_FIELD_...
NAME
zip_file_extra_field_get, 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(zip_t *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(zip_t *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)'d, and becomes
invalid when archive is closed. If idp is not NULL, the integer 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 speaking, lenp and idp
should be passed since only the extra field data is returned (i.e., nei-
ther the ID nor the length, if the idp and lenp arguments are not pro-
vided).
The following flags are supported:
ZIP_FL_CENTRAL Return extra fields from the archive's central
directory.
ZIP_FL_LOCAL Return extra fields from the local file head-
ers.
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).
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
+---------------+------------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+------------------+
|Availability | compress/libzip |
+---------------+------------------+
|Stability | Volatile |
+---------------+------------------+
SEE ALSO
libzip(3), zip_file_extra_field_delete(3), zip_file_extra_field_set(3),
zip_file_extra_fields_count(3)
HISTORY
zip_file_extra_field_get() and zip_file_extra_field_get_by_id() were
added in libzip 0.11.
AUTHORS
Dieter Baron <dillo@nih.at> and Thomas Klausner <tk@giga.or.at>
CAVEATS
Please note that the extra field IDs 0x0001 (ZIP64 extension), 0x6375
(Infozip UTF-8 comment), and 0x7075 (Infozip UTF-8 file name) can not be
read using zip_file_extra_field_get() since they are used by libzip(3)
internally.
NOTES
Source code for open source software components in Oracle Solaris can be
found at https://www.oracle.com/downloads/opensource/solaris-source-code-
downloads.html.
This software was built from source available at https://github.com/ora-
cle/solaris-userland. The original community source was downloaded from
https://libzip.org/download/libzip-1.7.3.tar.gz.
Further information about this software can be found on the open source
community website at https://libzip.org/.
BSD December 18, 2017 BSD