ZIP_FILE_EXTRA_FIELD_GET

Section: Library Functions Manual (3)
Updated: February 20, 2013
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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(struct zip *archivezip_uint64_t indexzip_uint16_t extra_field_indexzip_uint16_t *idpzip_uint16_t *lenpzip_flags_t flags);

const zip_uint8_t *
zip_file_extra_field_get_by_id(struct zip *archivezip_uint64_t indexzip_uint16_t extra_field_idzip_uint16_t extra_field_indexzip_uint16_t *lenpzip_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 archive. 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., 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 central 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 ALSO

libzip(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>


 

Index

NAME
LIBRARY
SYNOPSIS
DESCRIPTION
RETURN VALUES
ERRORS
SEE ALSO
AUTHORS