| package org.eclipse.jdt.internal.core.nd.db; |
| |
| public class LargeBlock { |
| public static final int SIZE_OFFSET = 0; |
| public static final int SIZE_OF_SIZE_FIELD = Database.INT_SIZE; |
| /** |
| * Size of the header for a large block. The header consists of a int which holds the number of chunks in the block. |
| * It is negative for an allocated block and positive for an unallocated block. The header is located at the start |
| * of the large block. |
| */ |
| public static final int HEADER_SIZE = Math.max(Database.INT_SIZE, Database.BLOCK_SIZE_DELTA); |
| |
| public static final int ENTRIES_IN_CHILD_TABLE = SIZE_OF_SIZE_FIELD * 8; |
| public static final int CHILD_TABLE_OFFSET = HEADER_SIZE; |
| public static final int PARENT_OFFSET = CHILD_TABLE_OFFSET + (Database.INT_SIZE * ENTRIES_IN_CHILD_TABLE); |
| public static final int PREV_BLOCK_OFFSET = PARENT_OFFSET + Database.INT_SIZE; |
| public static final int NEXT_BLOCK_OFFSET = PREV_BLOCK_OFFSET + Database.INT_SIZE; |
| |
| public static final int UNALLOCATED_HEADER_SIZE = NEXT_BLOCK_OFFSET + Database.INT_SIZE; |
| |
| /** |
| * The large block footer is located at the end of the last chunk in the large block. It is an exact copy of the |
| * header. |
| */ |
| public static final int FOOTER_SIZE = HEADER_SIZE; |
| } |
