Provided by: libgetdata-dev_0.7.3-6_i386 bug


       gd_alter_encoding — modify the binary encoding of data in a dirfile


       #include <getdata.h>

       int gd_alter_encoding(DIRFILE *dirfile, unsigned int encoding, int
              fragment_index, int recode);


       The gd_alter_encoding() function sets the binary encoding of the format
       specification  fragment  given  by  fragment_index  to  byte_sex in the
       dirfile(5) database specified by dirfile.  The  binary  encoding  of  a
       fragment   indicate  the  encoding  of  data  stored  in  binary  files
       associated with RAW fields defined  in  the  specified  fragment.   The
       binary encoding of a fragment containing no RAW fields is ignored.

       The byte_sex argument should be one of the following:


       See gd_cbopen(3) and dirfile-encoding(5)  for  the  meanings  of  these
       symbols and details on the supported encoding schemes.

       In  addition to being simply a valid fragment index, fragment_index may
       also be the special value GD_ALL_FRAGMENTS, which  indicates  that  the
       encoding of all fragments in the database should be changed.

       If  the  recode  argument is non-zero, this call will recode the binary
       data of affected RAW  fields  to  account  for  the  change  in  binary
       encoding.   If the encoding of the fragment is encoding insensitive, or
       if the data type is only one byte in  size,  no  change  is  made.   If
       recode is zero, affected binary files are left untouched.


       Upon  successful  completion,  gd_alter_encoding()  returns  zero.   On
       error, it returns -1 and sets the dirfile error  to  a  non-zero  error
       value.  Possible error values are:

               The specified dirfile was opened read-only.

               The library was unable to allocate memory.

               The supplied dirfile was invalid.

               The supplied index was out of range.

               The  metadata  of  the  given format specification fragment was
               protected from change, or the binary data of the  fragment  was
               protected from change and binary file recoding was requested.

               An I/O error occurred while attempting to recode a binary file.

               An error occurred while moving the recoded file into place.  As
               a result, the database may be in an  unclean  state.   See  the
               NOTES  section  below for recovery instructions.  In this case,
               the dirfile will be flagged  as  invalid,  to  prevent  further
               database corruption.  It should be immediately closed.

               The encoding scheme of the fragment is unknown.

               The  encoding  scheme  of  the fragment does not support binary
               file recoding.

       The  dirfile  error  may  be  retrieved  by  calling  gd_error(3).    A
       descriptive error string for the last error encountered can be obtained
       from a call to gd_error_string(3).


       A binary file recoding occurs out-of-place.  As  a  result,  sufficient
       space must be present on the filesystem for the binary files of all RAW
       fields in the fragment both  before  and  after  translation.   If  all
       fragments  are  updated  by  specifying  GD_ALL_FRAGMENTS, the recoding
       occurs one fragment at a time.

       An error code of GD_E_UNCLEAN_DB  indicates  a  system  error  occurred
       while moving the re-encoded binary data into place or when deleting the
       old data.  If this happens, the database may  be  left  in  an  unclean
       state.   The  caller  should check the filesystem directly to ascertain
       the  state  of  the  dirfile  data  before  continuing.   For  recovery
       instructions,                see                the                file


       gd_cbopen(3),    gd_error(3),    gd_error_string(3),    gd_encoding(3),
       dirfile(5), dirfile-format(5)