NAME
zip_file_extra_field_delete,
  
zip_file_extra_field_delete_by_id —
  
delete extra field for file in zip
LIBRARY
libzip (-lzip)
SYNOPSIS
#include <zip.h>
int
zip_file_extra_field_delete(
zip_t
  *archive, 
zip_uint64_t
  index, 
zip_uint16_t
  extra_field_index,
  
zip_flags_t flags);
int
zip_file_extra_field_delete_by_id(
zip_t
  *archive, 
zip_uint64_t
  index, 
zip_uint16_t
  extra_field_id,
  
zip_uint16_t
  extra_field_index,
  
zip_flags_t flags);
DESCRIPTION
The 
zip_file_extra_field_delete() function deletes the extra
  field with index 
extra_field_index for the file at
  position 
index in the zip archive.
If 
extra_field_index is
  
ZIP_EXTRA_FIELD_ALL, then all extra fields will be
  deleted.
The following 
flags are supported:
  -  
-  
- ZIP_FL_CENTRAL
- Delete extra fields from the archive's central
    directory.
-  
-  
- ZIP_FL_LOCAL
- Delete extra fields from the local file headers.
 
The 
zip_file_extra_field_delete_by_id() function deletes 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_delete()
  (
ZIP_EXTRA_FIELD_ALL will delete all extra fields of
  the specified ID).
Please note that due to the library design, the index of an extra field may be
  different between central directory and local file headers. For this reason,
  it is not allowed to specify both 
ZIP_FL_CENTRAL and
  
ZIP_FL_LOCAL in 
flags, except
  when deleting all extra fields (i.e., 
extra_field_index
  being 
ZIP_EXTRA_FIELD_ALL).
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_delete() and
  
zip_file_extra_field_delete_by_id() fail if:
  -  
-  
- [ZIP_ER_NOENT]
- index is not a valid file index in
      archive.
SEE ALSO
libzip(3),
  
zip_file_extra_field_get(3),
  
zip_file_extra_field_set(3),
  
zip_file_extra_fields_count(3)
HISTORY
zip_file_extra_field_delete() and
  
zip_file_extra_field_delete_by_id() were added in libzip
  0.11.
AUTHORS
Dieter Baron
  <
dillo@nih.at> and
  
Thomas Klausner
  <
tk@giga.or.at>