LauncherBackupHelper.java 文件源码

/** Unwrap a proto message from a CheckedMessage, verifying the checksum. */
private static byte[] readCheckedBytes(byte[] buffer, int dataSize)
        throws InvalidProtocolBufferNanoException {
    CheckedMessage wrapper = new CheckedMessage();
    MessageNano.mergeFrom(wrapper, buffer, 0, dataSize);
    CRC32 checksum = new CRC32();
    checksum.update(wrapper.payload);
    if (wrapper.checksum != checksum.getValue()) {
        throw new InvalidProtocolBufferNanoException("checksum does not match");
    }
    return wrapper.payload;
}