| /* |
| * Copyright (C) 2008-2009, Google Inc. |
| * Copyright (C) 2008, Marek Zawirski <marek.zawirski@gmail.com> |
| * Copyright (C) 2007-2009, Robin Rosenberg <robin.rosenberg@dewire.com> |
| * Copyright (C) 2006-2008, Shawn O. Pearce <spearce@spearce.org> and others |
| * |
| * 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.lib; |
| |
| import java.text.MessageFormat; |
| |
| import org.eclipse.jgit.errors.InvalidObjectIdException; |
| import org.eclipse.jgit.internal.JGitText; |
| import org.eclipse.jgit.util.NB; |
| import org.eclipse.jgit.util.RawParseUtils; |
| |
| /** |
| * A mutable SHA-1 abstraction. |
| */ |
| public class MutableObjectId extends AnyObjectId { |
| /** |
| * Empty constructor. Initialize object with default (zeros) value. |
| */ |
| public MutableObjectId() { |
| super(); |
| } |
| |
| /** |
| * Copying constructor. |
| * |
| * @param src |
| * original entry, to copy id from |
| */ |
| MutableObjectId(MutableObjectId src) { |
| fromObjectId(src); |
| } |
| |
| /** |
| * Set any byte in the id. |
| * |
| * @param index |
| * index of the byte to set in the raw form of the ObjectId. Must |
| * be in range [0, |
| * {@link org.eclipse.jgit.lib.Constants#OBJECT_ID_LENGTH}). |
| * @param value |
| * the value of the specified byte at {@code index}. Values are |
| * unsigned and thus are in the range [0,255] rather than the |
| * signed byte range of [-128, 127]. |
| * @throws java.lang.ArrayIndexOutOfBoundsException |
| * {@code index} is less than 0, equal to |
| * {@link org.eclipse.jgit.lib.Constants#OBJECT_ID_LENGTH}, or |
| * greater than |
| * {@link org.eclipse.jgit.lib.Constants#OBJECT_ID_LENGTH}. |
| */ |
| public void setByte(int index, int value) { |
| switch (index >> 2) { |
| case 0: |
| w1 = set(w1, index & 3, value); |
| break; |
| case 1: |
| w2 = set(w2, index & 3, value); |
| break; |
| case 2: |
| w3 = set(w3, index & 3, value); |
| break; |
| case 3: |
| w4 = set(w4, index & 3, value); |
| break; |
| case 4: |
| w5 = set(w5, index & 3, value); |
| break; |
| default: |
| throw new ArrayIndexOutOfBoundsException(index); |
| } |
| } |
| |
| private static int set(int w, int index, int value) { |
| value &= 0xff; |
| |
| switch (index) { |
| case 0: |
| return (w & 0x00ffffff) | (value << 24); |
| case 1: |
| return (w & 0xff00ffff) | (value << 16); |
| case 2: |
| return (w & 0xffff00ff) | (value << 8); |
| case 3: |
| return (w & 0xffffff00) | value; |
| default: |
| throw new ArrayIndexOutOfBoundsException(); |
| } |
| } |
| |
| /** |
| * Make this id match {@link org.eclipse.jgit.lib.ObjectId#zeroId()}. |
| */ |
| public void clear() { |
| w1 = 0; |
| w2 = 0; |
| w3 = 0; |
| w4 = 0; |
| w5 = 0; |
| } |
| |
| /** |
| * Copy an ObjectId into this mutable buffer. |
| * |
| * @param src |
| * the source id to copy from. |
| */ |
| public void fromObjectId(AnyObjectId src) { |
| this.w1 = src.w1; |
| this.w2 = src.w2; |
| this.w3 = src.w3; |
| this.w4 = src.w4; |
| this.w5 = src.w5; |
| } |
| |
| /** |
| * Convert an ObjectId from raw binary representation. |
| * |
| * @param bs |
| * the raw byte buffer to read from. At least 20 bytes must be |
| * available within this byte array. |
| */ |
| public void fromRaw(byte[] bs) { |
| fromRaw(bs, 0); |
| } |
| |
| /** |
| * Convert an ObjectId from raw binary representation. |
| * |
| * @param bs |
| * the raw byte buffer to read from. At least 20 bytes after p |
| * must be available within this byte array. |
| * @param p |
| * position to read the first byte of data from. |
| */ |
| public void fromRaw(byte[] bs, int p) { |
| w1 = NB.decodeInt32(bs, p); |
| w2 = NB.decodeInt32(bs, p + 4); |
| w3 = NB.decodeInt32(bs, p + 8); |
| w4 = NB.decodeInt32(bs, p + 12); |
| w5 = NB.decodeInt32(bs, p + 16); |
| } |
| |
| /** |
| * Convert an ObjectId from binary representation expressed in integers. |
| * |
| * @param ints |
| * the raw int buffer to read from. At least 5 integers must be |
| * available within this integers array. |
| */ |
| public void fromRaw(int[] ints) { |
| fromRaw(ints, 0); |
| } |
| |
| /** |
| * Convert an ObjectId from binary representation expressed in integers. |
| * |
| * @param ints |
| * the raw int buffer to read from. At least 5 integers after p |
| * must be available within this integers array. |
| * @param p |
| * position to read the first integer of data from. |
| */ |
| public void fromRaw(int[] ints, int p) { |
| w1 = ints[p]; |
| w2 = ints[p + 1]; |
| w3 = ints[p + 2]; |
| w4 = ints[p + 3]; |
| w5 = ints[p + 4]; |
| } |
| |
| /** |
| * Convert an ObjectId from binary representation expressed in integers. |
| * |
| * @param a |
| * an int. |
| * @param b |
| * an int. |
| * @param c |
| * an int. |
| * @param d |
| * an int. |
| * @param e |
| * an int. |
| * @since 4.7 |
| */ |
| public void set(int a, int b, int c, int d, int e) { |
| w1 = a; |
| w2 = b; |
| w3 = c; |
| w4 = d; |
| w5 = e; |
| } |
| |
| /** |
| * Convert an ObjectId from hex characters (US-ASCII). |
| * |
| * @param buf |
| * the US-ASCII buffer to read from. At least 40 bytes after |
| * offset must be available within this byte array. |
| * @param offset |
| * position to read the first character from. |
| */ |
| public void fromString(byte[] buf, int offset) { |
| fromHexString(buf, offset); |
| } |
| |
| /** |
| * Convert an ObjectId from hex characters. |
| * |
| * @param str |
| * the string to read from. Must be 40 characters long. |
| */ |
| public void fromString(String str) { |
| if (str.length() != Constants.OBJECT_ID_STRING_LENGTH) |
| throw new IllegalArgumentException(MessageFormat.format( |
| JGitText.get().invalidId, str)); |
| fromHexString(Constants.encodeASCII(str), 0); |
| } |
| |
| private void fromHexString(byte[] bs, int p) { |
| try { |
| w1 = RawParseUtils.parseHexInt32(bs, p); |
| w2 = RawParseUtils.parseHexInt32(bs, p + 8); |
| w3 = RawParseUtils.parseHexInt32(bs, p + 16); |
| w4 = RawParseUtils.parseHexInt32(bs, p + 24); |
| w5 = RawParseUtils.parseHexInt32(bs, p + 32); |
| } catch (ArrayIndexOutOfBoundsException e) { |
| InvalidObjectIdException e1 = new InvalidObjectIdException(bs, p, |
| Constants.OBJECT_ID_STRING_LENGTH); |
| e1.initCause(e); |
| throw e1; |
| } |
| } |
| |
| @Override |
| public ObjectId toObjectId() { |
| return new ObjectId(this); |
| } |
| } |