Function ffmpeg_dev::sys::ffurl_read_complete

pub unsafe extern "C" fn ffurl_read_complete(
    h: *mut URLContext, 
    buf: *mut c_uchar, 
    size: c_int
) -> c_int

Read as many bytes as possible (up to size), calling the read function multiple times if necessary. This makes special short-read handling in applications unnecessary, if the return value is < size then it is certain there was either an error or the end of file was reached.