NAME
zip_file_extra_field_set — 
set extra
  field for file in zip
LIBRARY
libzip (-lzip)
SYNOPSIS
#include <zip.h>
int
zip_file_extra_field_set(
zip_t
  *archive, 
zip_uint64_t
  index, 
zip_uint16_t
  extra_field_id,
  
zip_uint16_t
  extra_field_index, 
const
  zip_uint8_t *extra_field_data,
  
zip_uint16_t len,
  
zip_flags_t flags);
DESCRIPTION
The 
zip_file_extra_field_set() function sets the extra field
  with ID (two-byte signature) 
extra_field_id and index
  
extra_field_index for the file at position
  
index in the zip archive. The extra field's data will be
  set to 
extra_field_data and length
  
len. If a new entry shall be appended, set
  
extra_field_index to
  
ZIP_EXTRA_FIELD_NEW.
At least one of the following 
flags must be set:
  -  
-  
- ZIP_FL_CENTRAL
- Set extra field in the archive's central directory.
-  
-  
- ZIP_FL_LOCAL
- Set extra field in the local file headers.
 
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 set using
  
zip_file_extra_field_set() since they are set by
  
libzip(3) automatically when needed.
RETURN VALUES
Upon successful completion 0 is returned. Otherwise, -1 is returned and the
  error code in 
archive is set to indicate the error.
ERRORS
zip_file_extra_field_set() fails if:
  -  
-  
- [ZIP_ER_INVAL]
- The extra field size is too large (ID and length need 4
      bytes; the maximum length of all extra fields for one file combined is
      65536 bytes). This error also occurs if
      extra_field_index is too large.
-  
-  
- [ZIP_ER_MEMORY]
- Required memory could not be allocated.
-  
-  
- [ZIP_ER_NOENT]
- index is not a valid file index in
      archive.
SEE ALSO
libzip(3),
  
zip_file_extra_field_delete(3),
  
zip_file_extra_field_get(3),
  
zip_file_extra_fields_count(3)
HISTORY
zip_file_extra_field_set() was added in libzip 0.11.
AUTHORS
Dieter Baron
  <
dillo@nih.at> and
  
Thomas Klausner
  <
tk@giga.or.at>