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 support‐
       ed  by the GetData library.  The encoding argument should be one of the following symbols, indicating the
       encoding type:

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

       See gd_cbopen(3) and dirfile-encoding(5) for the meanings of these symbols and details on the  known  en‐
       coding 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 en‐
       coding.  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.

SEE ALSO

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

Version 0.9.0                                      5 May 2014                             gd_encoding_support(3)