Function BrotliDecoderIsUsed 

pub unsafe extern "C" fn BrotliDecoderIsUsed(
    state: *const BrotliDecoderState,
) -> BROTLI_BOOL

Checks if instance has already consumed input.

Instance that returns ::BROTLI_FALSE is considered “fresh” and could be reused.

@param state decoder instance @returns ::BROTLI_TRUE if decoder has already used some input bytes @returns ::BROTLI_FALSE otherwise