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- /*
- * Copyright (C) 2015, Matthias Sohn <matthias.sohn@sap.com>
- * and other copyright owners as documented in the project's IP log.
- *
- * This program and the accompanying materials are made available
- * under the terms of the Eclipse Distribution License v1.0 which
- * accompanies this distribution, is reproduced below, and is
- * available at http://www.eclipse.org/org/documents/edl-v10.php
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or
- * without modification, are permitted provided that the following
- * conditions are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- *
- * - Neither the name of the Eclipse Foundation, Inc. nor the
- * names of its contributors may be used to endorse or promote
- * products derived from this software without specific prior
- * written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
- * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
- package org.eclipse.jgit.lfs.lib;
-
- import java.io.IOException;
- import java.io.ObjectInputStream;
- import java.io.ObjectOutputStream;
- import java.io.Serializable;
-
- import org.eclipse.jgit.lfs.errors.InvalidLongObjectIdException;
- import org.eclipse.jgit.lib.ObjectId;
- import org.eclipse.jgit.util.NB;
- import org.eclipse.jgit.util.RawParseUtils;
-
- /**
- * A SHA-256 abstraction.
- *
- * Ported to SHA-256 from {@link ObjectId}
- *
- * @since 4.3
- */
- public class LongObjectId extends AnyLongObjectId implements Serializable {
- private static final long serialVersionUID = 1L;
-
- private static final LongObjectId ZEROID;
-
- private static final String ZEROID_STR;
-
- static {
- ZEROID = new LongObjectId(0L, 0L, 0L, 0L);
- ZEROID_STR = ZEROID.name();
- }
-
- /**
- * Get the special all-zero LongObjectId.
- *
- * @return the all-zero LongObjectId, often used to stand-in for no object.
- */
- public static final LongObjectId zeroId() {
- return ZEROID;
- }
-
- /**
- * Test a string of characters to verify that it can be interpreted as
- * LongObjectId.
- * <p>
- * If true the string can be parsed with {@link #fromString(String)}.
- *
- * @param id
- * the string to test.
- * @return true if the string can converted into an LongObjectId.
- */
- public static final boolean isId(final String id) {
- if (id.length() != Constants.LONG_OBJECT_ID_STRING_LENGTH)
- return false;
- try {
- for (int i = 0; i < Constants.LONG_OBJECT_ID_STRING_LENGTH; i++) {
- RawParseUtils.parseHexInt4((byte) id.charAt(i));
- }
- return true;
- } catch (ArrayIndexOutOfBoundsException e) {
- return false;
- }
- }
-
- /**
- * Convert a LongObjectId into a hex string representation.
- *
- * @param i
- * the id to convert. May be null.
- * @return the hex string conversion of this id's content.
- */
- public static final String toString(final LongObjectId i) {
- return i != null ? i.name() : ZEROID_STR;
- }
-
- /**
- * Compare two object identifier byte sequences for equality.
- *
- * @param firstBuffer
- * the first buffer to compare against. Must have at least 32
- * bytes from position fi through the end of the buffer.
- * @param fi
- * first offset within firstBuffer to begin testing.
- * @param secondBuffer
- * the second buffer to compare against. Must have at least 32
- * bytes from position si through the end of the buffer.
- * @param si
- * first offset within secondBuffer to begin testing.
- * @return true if the two identifiers are the same.
- */
- public static boolean equals(final byte[] firstBuffer, final int fi,
- final byte[] secondBuffer, final int si) {
- return firstBuffer[fi] == secondBuffer[si]
- && firstBuffer[fi + 1] == secondBuffer[si + 1]
- && firstBuffer[fi + 2] == secondBuffer[si + 2]
- && firstBuffer[fi + 3] == secondBuffer[si + 3]
- && firstBuffer[fi + 4] == secondBuffer[si + 4]
- && firstBuffer[fi + 5] == secondBuffer[si + 5]
- && firstBuffer[fi + 6] == secondBuffer[si + 6]
- && firstBuffer[fi + 7] == secondBuffer[si + 7]
- && firstBuffer[fi + 8] == secondBuffer[si + 8]
- && firstBuffer[fi + 9] == secondBuffer[si + 9]
- && firstBuffer[fi + 10] == secondBuffer[si + 10]
- && firstBuffer[fi + 11] == secondBuffer[si + 11]
- && firstBuffer[fi + 12] == secondBuffer[si + 12]
- && firstBuffer[fi + 13] == secondBuffer[si + 13]
- && firstBuffer[fi + 14] == secondBuffer[si + 14]
- && firstBuffer[fi + 15] == secondBuffer[si + 15]
- && firstBuffer[fi + 16] == secondBuffer[si + 16]
- && firstBuffer[fi + 17] == secondBuffer[si + 17]
- && firstBuffer[fi + 18] == secondBuffer[si + 18]
- && firstBuffer[fi + 19] == secondBuffer[si + 19]
- && firstBuffer[fi + 20] == secondBuffer[si + 20]
- && firstBuffer[fi + 21] == secondBuffer[si + 21]
- && firstBuffer[fi + 22] == secondBuffer[si + 22]
- && firstBuffer[fi + 23] == secondBuffer[si + 23]
- && firstBuffer[fi + 24] == secondBuffer[si + 24]
- && firstBuffer[fi + 25] == secondBuffer[si + 25]
- && firstBuffer[fi + 26] == secondBuffer[si + 26]
- && firstBuffer[fi + 27] == secondBuffer[si + 27]
- && firstBuffer[fi + 28] == secondBuffer[si + 28]
- && firstBuffer[fi + 29] == secondBuffer[si + 29]
- && firstBuffer[fi + 30] == secondBuffer[si + 30]
- && firstBuffer[fi + 31] == secondBuffer[si + 31];
- }
-
- /**
- * Convert a LongObjectId from raw binary representation.
- *
- * @param bs
- * the raw byte buffer to read from. At least 32 bytes must be
- * available within this byte array.
- * @return the converted object id.
- */
- public static final LongObjectId fromRaw(final byte[] bs) {
- return fromRaw(bs, 0);
- }
-
- /**
- * Convert a LongObjectId from raw binary representation.
- *
- * @param bs
- * the raw byte buffer to read from. At least 32 bytes after p
- * must be available within this byte array.
- * @param p
- * position to read the first byte of data from.
- * @return the converted object id.
- */
- public static final LongObjectId fromRaw(final byte[] bs, final int p) {
- final long a = NB.decodeInt64(bs, p);
- final long b = NB.decodeInt64(bs, p + 8);
- final long c = NB.decodeInt64(bs, p + 16);
- final long d = NB.decodeInt64(bs, p + 24);
- return new LongObjectId(a, b, c, d);
- }
-
- /**
- * Convert a LongObjectId from raw binary representation.
- *
- * @param is
- * the raw long buffer to read from. At least 4 longs must be
- * available within this long array.
- * @return the converted object id.
- */
- public static final LongObjectId fromRaw(final long[] is) {
- return fromRaw(is, 0);
- }
-
- /**
- * Convert a LongObjectId from raw binary representation.
- *
- * @param is
- * the raw long buffer to read from. At least 4 longs after p
- * must be available within this long array.
- * @param p
- * position to read the first long of data from.
- * @return the converted object id.
- */
- public static final LongObjectId fromRaw(final long[] is, final int p) {
- return new LongObjectId(is[p], is[p + 1], is[p + 2], is[p + 3]);
- }
-
- /**
- * Convert a LongObjectId from hex characters (US-ASCII).
- *
- * @param buf
- * the US-ASCII buffer to read from. At least 64 bytes after
- * offset must be available within this byte array.
- * @param offset
- * position to read the first character from.
- * @return the converted object id.
- */
- public static final LongObjectId fromString(final byte[] buf, final int offset) {
- return fromHexString(buf, offset);
- }
-
- /**
- * Convert a LongObjectId from hex characters.
- *
- * @param str
- * the string to read from. Must be 64 characters long.
- * @return the converted object id.
- */
- public static LongObjectId fromString(final String str) {
- if (str.length() != Constants.LONG_OBJECT_ID_STRING_LENGTH)
- throw new InvalidLongObjectIdException(str);
- return fromHexString(org.eclipse.jgit.lib.Constants.encodeASCII(str),
- 0);
- }
-
- private static final LongObjectId fromHexString(final byte[] bs, int p) {
- try {
- final long a = RawParseUtils.parseHexInt64(bs, p);
- final long b = RawParseUtils.parseHexInt64(bs, p + 16);
- final long c = RawParseUtils.parseHexInt64(bs, p + 32);
- final long d = RawParseUtils.parseHexInt64(bs, p + 48);
- return new LongObjectId(a, b, c, d);
- } catch (ArrayIndexOutOfBoundsException e1) {
- throw new InvalidLongObjectIdException(bs, p,
- Constants.LONG_OBJECT_ID_STRING_LENGTH);
- }
- }
-
- LongObjectId(final long new_1, final long new_2, final long new_3,
- final long new_4) {
- w1 = new_1;
- w2 = new_2;
- w3 = new_3;
- w4 = new_4;
- }
-
- /**
- * Initialize this instance by copying another existing LongObjectId.
- * <p>
- * This constructor is mostly useful for subclasses which want to extend a
- * LongObjectId with more properties, but initialize from an existing
- * LongObjectId instance acquired by other means.
- *
- * @param src
- * another already parsed LongObjectId to copy the value out of.
- */
- protected LongObjectId(final AnyLongObjectId src) {
- w1 = src.w1;
- w2 = src.w2;
- w3 = src.w3;
- w4 = src.w4;
- }
-
- @Override
- public LongObjectId toObjectId() {
- return this;
- }
-
- private void writeObject(ObjectOutputStream os) throws IOException {
- os.writeLong(w1);
- os.writeLong(w2);
- os.writeLong(w3);
- os.writeLong(w4);
- }
-
- private void readObject(ObjectInputStream ois) throws IOException {
- w1 = ois.readLong();
- w2 = ois.readLong();
- w3 = ois.readLong();
- w4 = ois.readLong();
- }
- }
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