@param fp BGZF file handle
@return A small integer matching the corresponding
enum htsCompression value:
- 0 / no_compression if the file is uncompressed
- 1 / gzip if the file is plain GZIP-compressed
- 2 / bgzf if the file is BGZF-compressed
@since 1.4
Return the file's compression format
@param fp BGZF file handle @return A small integer matching the corresponding enum htsCompression value: - 0 / no_compression if the file is uncompressed - 1 / gzip if the file is plain GZIP-compressed - 2 / bgzf if the file is BGZF-compressed @since 1.4