ReftableConstants.java

  1. /*
  2.  * Copyright (C) 2017, Google Inc. and others
  3.  *
  4.  * This program and the accompanying materials are made available under the
  5.  * terms of the Eclipse Distribution License v. 1.0 which is available at
  6.  * https://www.eclipse.org/org/documents/edl-v10.php.
  7.  *
  8.  * SPDX-License-Identifier: BSD-3-Clause
  9.  */

  11. package org.eclipse.jgit.internal.storage.reftable;

  13. class ReftableConstants {
  14.     static final byte[] FILE_HEADER_MAGIC = { 'R', 'E', 'F', 'T' };
  15.     static final byte VERSION_1 = (byte) 1;

  17.     static final int FILE_HEADER_LEN = 24;
  18.     static final int FILE_FOOTER_LEN = 68;

  20.     static final byte FILE_BLOCK_TYPE = 'R';
  21.     static final byte REF_BLOCK_TYPE = 'r';
  22.     static final byte OBJ_BLOCK_TYPE = 'o';
  23.     static final byte LOG_BLOCK_TYPE = 'g';
  24.     static final byte INDEX_BLOCK_TYPE = 'i';

  26.     static final int VALUE_NONE = 0x0;
  27.     static final int VALUE_1ID = 0x1;
  28.     static final int VALUE_2ID = 0x2;
  29.     static final int VALUE_SYMREF = 0x3;
  30.     static final int VALUE_TYPE_MASK = 0x7;

  32.     static final int LOG_NONE = 0x0;
  33.     static final int LOG_DATA = 0x1;

  35.     static final int MAX_BLOCK_SIZE = (1 << 24) - 1;
  36.     static final int MAX_RESTARTS = 65535;

  38.     static boolean isFileHeaderMagic(byte[] buf, int o, int n) {
  39.         return (n - o) >= FILE_HEADER_MAGIC.length
  40.                 && buf[o + 0] == FILE_HEADER_MAGIC[0]
  41.                 && buf[o + 1] == FILE_HEADER_MAGIC[1]
  42.                 && buf[o + 2] == FILE_HEADER_MAGIC[2]
  43.                 && buf[o + 3] == FILE_HEADER_MAGIC[3];
  44.     }

  46.     static long reverseUpdateIndex(long time) {
  47.         return 0xffffffffffffffffL - time;
  48.     }

  50.     private ReftableConstants() {
  51.     }
  52. }
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