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/*
* Copyright (C) 2021, Tencent.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.internal.storage.commitgraph;
/**
* Constants relating to commit-graph.
*/
class CommitGraphConstants {
static final int COMMIT_GRAPH_MAGIC = 0x43475048; /* "CGPH" */
static final int CHUNK_ID_OID_FANOUT = 0x4f494446; /* "OIDF" */
static final int CHUNK_ID_OID_LOOKUP = 0x4f49444c; /* "OIDL" */
static final int CHUNK_ID_COMMIT_DATA = 0x43444154; /* "CDAT" */
static final int CHUNK_ID_EXTRA_EDGE_LIST = 0x45444745; /* "EDGE" */
static final int CHUNK_ID_BLOOM_FILTER_INDEX = 0x42494458; /* "BIDX" */
static final int CHUNK_ID_BLOOM_FILTER_DATA = 0x42444154; /* "BDAT" */
/**
* First 4 bytes describe the chunk id. Value 0 is a terminating label.
* Other 8 bytes provide the byte-offset in current file for chunk to start.
*/
static final int CHUNK_LOOKUP_WIDTH = 12;
/**
* First 8 bytes are for the positions of the first two parents of the ith
* commit. The next 8 bytes store the generation number of the commit and
* the commit time in seconds since EPOCH.
*/
static final int COMMIT_DATA_WIDTH = 16;
/** Mask to make the last edgeValue into position */
static final int GRAPH_EDGE_LAST_MASK = 0x7fffffff;
/** EdgeValue & GRAPH_LAST_EDGE != 0 means it is the last edgeValue */
static final int GRAPH_LAST_EDGE = 0x80000000;
/** EdgeValue == GRAPH_NO_PARENT means it has no parents */
static final int GRAPH_NO_PARENT = 0x70000000;
/**
* EdgeValue & GRAPH_EXTRA_EDGES_NEEDED != 0 means its other parents are
* in Chunk Extra Edge List
*/
static final int GRAPH_EXTRA_EDGES_NEEDED = 0x80000000;
}
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