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    1   /* HeaderBlock
    2   *
    3   * Created on September 12, 2006
    4   *
    5   * Copyright (C) 2006 Internet Archive.
    6   *
    7   * This file is part of the Heritrix web crawler (crawler.archive.org).
    8   *
    9   * Heritrix is free software; you can redistribute it and/or modify
    10  * it under the terms of the GNU Lesser Public License as published by
    11  * the Free Software Foundation; either version 2.1 of the License, or
    12  * any later version.
    13  *
    14  * Heritrix is distributed in the hope that it will be useful,
    15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    17  * GNU Lesser Public License for more details.
    18  *
    19  * You should have received a copy of the GNU Lesser Public License
    20  * along with Heritrix; if not, write to the Free Software
    21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
    22  */
    23  package org.archive.util.ms;
    24
    25
    26  import java.nio.ByteBuffer;
    27  import java.nio.ByteOrder;
    28
    29
    30  class HeaderBlock {
    31
    32
    33      private ByteBuffer buffer;
    34
    35
    36      public HeaderBlock(ByteBuffer buffer) {
    37          // FIXME: Read the fields we're interested in directly from stream
    38          this.buffer = buffer;
    39          buffer.order(ByteOrder.LITTLE_ENDIAN);
    40      }
    41
    42
    43      public long getFileType() {
    44          return buffer.getLong(0);
    45      }
    46
    47
    48      public int getBATCount() {
    49          return buffer.getInt(0x2C);
    50      }
    51
    52
    53      public int getEntriesStart() {
    54          return buffer.getInt(0x30);
    55      }
    56
    57
    58      public int getSmallBATStart() {
    59          return buffer.getInt(0x3C);
    60      }
    61
    62
    63      public int getSmallBATCount() {
    64          return buffer.getInt(0x40);
    65      }
    66
    67
    68      public int getExtendedBATStart() {
    69          return buffer.getInt(0x44);
    70      }
    71
    72
    73      public int getExtendedBATCount() {
    74          return buffer.getInt(0x48);
    75      }
    76
    77
    78      public int getBATBlockNumber(int block) {
    79          assert block < 110;
    80          return buffer.getInt(0x4C + block * 4);
    81      }
    82
    83
    84      public String toString() {
    85          StringBuilder sb = new StringBuilder("HeaderBlock{");
    86          sb.append("fileType=" + getFileType());
    87          sb.append(" propertiesStart=" + getEntriesStart());
    88          sb.append(" batCount=" + getBATCount());
    89          sb.append(" extendedBATStart=" + getExtendedBATStart());
    90          sb.append(" extendedBATCount=" + getExtendedBATCount());
    91          sb.append(" smallBATStart=" + getSmallBATStart());
    92          sb.append(" smallBATCount=" + getSmallBATCount());
    93          sb.append("}");
    94          return sb.toString();
    95      }
    96
    97  }