1 package org.eclipse.jdt.internal.core.nd.db; 2 3 public class LargeBlock { 4 public static final int SIZE_OFFSET = 0; 5 public static final int SIZE_OF_SIZE_FIELD = Database.INT_SIZE; 6 /** 7 * Size of the header for a large block. The header consists of a int which holds the number of chunks in the block. 8 * It is negative for an allocated block and positive for an unallocated block. The header is located at the start 9 * of the large block. 10 */ 11 public static final int HEADER_SIZE = Math.max(Database.INT_SIZE, Database.BLOCK_SIZE_DELTA); 12 13 public static final int ENTRIES_IN_CHILD_TABLE = SIZE_OF_SIZE_FIELD * 8; 14 public static final int CHILD_TABLE_OFFSET = HEADER_SIZE; 15 public static final int PARENT_OFFSET = CHILD_TABLE_OFFSET + (Database.INT_SIZE * ENTRIES_IN_CHILD_TABLE); 16 public static final int PREV_BLOCK_OFFSET = PARENT_OFFSET + Database.INT_SIZE; 17 public static final int NEXT_BLOCK_OFFSET = PREV_BLOCK_OFFSET + Database.INT_SIZE; 18 19 public static final int UNALLOCATED_HEADER_SIZE = NEXT_BLOCK_OFFSET + Database.INT_SIZE; 20 21 /** 22 * The large block footer is located at the end of the last chunk in the large block. It is an exact copy of the 23 * header. 24 */ 25 public static final int FOOTER_SIZE = HEADER_SIZE; 26 } 27