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NAME

       gd_encoding_support — determine GetData library support for data encodings

SYNOPSIS

       #include <getdata.h>

       int gd_encoding_support(unsigned long encoding);

DESCRIPTION

       The  gd_encoding_support()  function  reports  whether  the  Dirfile encoding specified by
       encoding is supported by the GetData library.  The encoding argument should be one of  the
       following symbols, indicating the encoding type:

              GD_UNENCODED, GD_BZIP2_ENCODED, GD_FLAC_ENCODED, GD_GZIP_ENCODED, GD_LZMA_ENCODED,
              GD_SIE_ENCODED, GD_SLIM_ENCODED, GD_TEXT_ENCODED, GD_ZZIP_ENCODED,
              GD_ZZSLIM_ENCODED.

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

RETURN VALUE

       The function gd_encoding_support() returns GD_RDWR if the GetData library  can  read  from
       and  write  to the specified encoding, GD_RDONLY if the GetData library can only read from
       the specified encoding, or -1 if neither reading nor writing is supported, or if  encoding
       was not one of the symbols listed above.

NOTES

       GetData's  encoding  support  framework  is  more finely grained than the three-way system
       reported by this function.  It is possible for the library to  have  partial  support  for
       reading or writing a particular encoding.  This function will only report positive support
       if all functions of a given class (read-only or read-write) are supported.

       Furthermore, encoding types can have multiple subtypes with different degrees of  support.
       This  function  reports  the support of the most supported subtype.  For example, the LZMA
       encoding framework can read both the .lzma and .xz container formats, but only  write  .xz
       files.   If  LZMA  support  is  available,  this  function will return GD_RDWR when passed
       GD_LZMA_ENCODED.

HISTORY

       The gd_encoding_support() function appeared in GetData-0.9.0.

SEE ALSO

       gd_encoding(3), gd_open(3), dirfile-encoding(5)