android/guava/src/com/google/common/hash/LittleEndianByteArray.java
static void store64(byte[] sink, int offset, long value) {
    // We don't want to assert in production code.
    assert offset >= 0 && offset + 8 <= sink.length;
    // Delegates to the fast (unsafe)version or the fallback.
    byteArray.putLongLittleEndian(sink, offset, value);
  }
static void store64(byte[] sink, int offset, long value) {
    // We don't want to assert in production code.
    assert offset >= 0 && offset + 8 <= sink.length;
    // Delegates to the fast (unsafe)version or the fallback.
    byteArray.putLongLittleEndian(sink, offset, value);
  }
Store 8 bytes into the provided array at the indicated offset, using the value provided.

@param sink the output byte array
@param offset the offset into the array at which to start writing
@param value the value to write