NAME
zip_file_extra_fields_count,
  
zip_file_extra_fields_count_by_id —
  
count extra fields for file in zip
LIBRARY
libzip (-lzip)
SYNOPSIS
#include <zip.h>
zip_int16_t
zip_file_extra_fields_count(
zip_t
  *archive, 
zip_uint64_t
  index, 
zip_flags_t
  flags);
zip_int16_t
zip_file_extra_fields_count_by_id(
zip_t
  *archive, 
zip_uint64_t
  index, 
zip_uint16_t
  extra_field_id, 
zip_flags_t
  flags);
DESCRIPTION
The 
zip_file_extra_fields_count() function counts the extra
  fields for the file at position 
index in the zip
  archive.
The following 
flags are supported:
  -  
-  
- ZIP_FL_CENTRAL
- Count extra fields from the archive's central
    directory.
-  
-  
- ZIP_FL_LOCAL
- Count extra fields from the local file headers.
-  
-  
- ZIP_FL_UNCHANGED
- Count the original unchanged extra fields, ignoring any
      changes made.
 
The 
zip_file_extra_fields_count_by_id() function counts the
  extra fields with ID (two-byte signature)
  
extra_field_id. The other arguments are the same as for
  
zip_file_extra_fields_count().
Extra fields that are the same in the central directory and the local file
  header are merged into one. Therefore, the counts with
  
ZIP_FL_CENTRAL and
  
ZIP_FL_LOCAL do not need to add up to the same value
  as when given 
ZIP_FL_CENTRAL|ZIP_FL_LOCAL at the same
  time.
RETURN VALUES
Upon successful completion, the requested number of extra fields is returned.
  Otherwise, -1 is returned and the error code in 
archive
  is set to indicate the error.
ERRORS
zip_file_extra_fields_count() and
  
zip_file_extra_fields_count_by_id() fail if:
  -  
-  
- [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_field_set(3)
HISTORY
zip_file_extra_fields_count() and
  
zip_file_extra_fields_count_by_id() were added in libzip
  0.11.
AUTHORS
Dieter Baron
  <
dillo@nih.at> and
  
Thomas Klausner
  <
tk@giga.or.at>