Function blosc_sys::blosc_cbuffer_metainfo [−] [src]

pub unsafe extern "C" fn blosc_cbuffer_metainfo(
    cbuffer: *const c_void, 
    typesize: *mut usize, 
    flags: *mut c_int
)

Return meta-information about a compressed buffer, namely the type size (typesize), as well as some internal flags.

The flags is a set of bits, where the used ones are: bit 0: whether the shuffle filter has been applied or not bit 1: whether the internal buffer is a pure memcpy or not bit 2: whether the bit shuffle filter has been applied or not

You can use the BLOSC_DOSHUFFLE, BLOSC_DOBITSHUFFLE and BLOSC_MEMCPYED symbols for extracting the interesting bits (e.g. flags & BLOSC_DOSHUFFLE says whether the buffer is byte-shuffled or not).

You only need to pass the first BLOSC_MIN_HEADER_LENGTH bytes of a compressed buffer for this call to work.

If the format is not supported by the library, all output arguments will be filled with zeros.