Function encoding_new_decoder 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn encoding_new_decoder(
    encoding: *const Encoding,
) -> *mut Decoder

Allocates a new Decoder for the given Encoding on the heap with BOM sniffing enabled and returns a pointer to the newly-allocated Decoder.

BOM sniffing may cause the returned decoder to morph into a decoder for UTF-8, UTF-16LE or UTF-16BE instead of this encoding.

Once the allocated Decoder is no longer needed, the caller MUST deallocate it by passing the pointer returned by this function to decoder_free().

Undefined behavior

UB ensues if the argument is NULL.