pub type NetBlobAdapterFetchFn = unsafe extern "C" fn(ctx: *mut c_void, uri: *const c_char, hash: *const u8, size: u64, out_data: *mut *mut u8, out_len: *mut usize) -> c_int;Expand description
fetch / fetch_range function pointer. Caller-allocates the
return buffer and writes the pointer + length into the
out-params. The substrate releases it via the vtable’s
free_buffer after consuming the bytes.