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/*
* Copyright (C) 2015, Matthias Sohn <matthias.sohn@sap.com> 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.lfs.lib;
import java.text.MessageFormat;
import org.eclipse.jgit.lfs.errors.InvalidLongObjectIdException;
import org.eclipse.jgit.lfs.internal.LfsText;
import org.eclipse.jgit.util.NB;
import org.eclipse.jgit.util.RawParseUtils;
/**
* A mutable SHA-256 abstraction.
*
* Ported to SHA-256 from {@link org.eclipse.jgit.lib.MutableObjectId}
*
* @since 4.3
*/
public class MutableLongObjectId extends AnyLongObjectId {
/**
* Empty constructor. Initialize object with default (zeros) value.
*/
public MutableLongObjectId() {
super();
}
/**
* Copying constructor.
*
* @param src
* original entry, to copy id from
*/
MutableLongObjectId(MutableLongObjectId 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.lfs.lib.Constants#LONG_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.lfs.lib.Constants#LONG_OBJECT_ID_LENGTH},
* or greater than
* {@link org.eclipse.jgit.lfs.lib.Constants#LONG_OBJECT_ID_LENGTH}.
*/
public void setByte(int index, int value) {
switch (index >> 3) {
case 0:
w1 = set(w1, index & 7, value);
break;
case 1:
w2 = set(w2, index & 7, value);
break;
case 2:
w3 = set(w3, index & 7, value);
break;
case 3:
w4 = set(w4, index & 7, value);
break;
default:
throw new ArrayIndexOutOfBoundsException(index);
}
}
private static long set(long w, int index, long value) {
value &= 0xff;
switch (index) {
case 0:
return (w & 0x00ffffffffffffffL) | (value << 56);
case 1:
return (w & 0xff00ffffffffffffL) | (value << 48);
case 2:
return (w & 0xffff00ffffffffffL) | (value << 40);
case 3:
return (w & 0xffffff00ffffffffL) | (value << 32);
case 4:
return (w & 0xffffffff00ffffffL) | (value << 24);
case 5:
return (w & 0xffffffffff00ffffL) | (value << 16);
case 6:
return (w & 0xffffffffffff00ffL) | (value << 8);
case 7:
return (w & 0xffffffffffffff00L) | value;
default:
throw new ArrayIndexOutOfBoundsException();
}
}
/**
* Make this id match
* {@link org.eclipse.jgit.lfs.lib.LongObjectId#zeroId()}.
*/
public void clear() {
w1 = 0;
w2 = 0;
w3 = 0;
w4 = 0;
}
/**
* Copy a LongObjectId into this mutable buffer.
*
* @param src
* the source id to copy from.
*/
public void fromObjectId(AnyLongObjectId src) {
this.w1 = src.w1;
this.w2 = src.w2;
this.w3 = src.w3;
this.w4 = src.w4;
}
/**
* 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.
*/
public void fromRaw(byte[] bs) {
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.
*/
public void fromRaw(byte[] bs, int p) {
w1 = NB.decodeInt64(bs, p);
w2 = NB.decodeInt64(bs, p + 8);
w3 = NB.decodeInt64(bs, p + 16);
w4 = NB.decodeInt64(bs, p + 24);
}
/**
* Convert a LongObjectId from binary representation expressed in integers.
*
* @param longs
* the raw long buffer to read from. At least 4 longs must be
* available within this longs array.
*/
public void fromRaw(long[] longs) {
fromRaw(longs, 0);
}
/**
* Convert a LongObjectId from binary representation expressed in longs.
*
* @param longs
* the raw int buffer to read from. At least 4 longs after p must
* be available within this longs array.
* @param p
* position to read the first integer of data from.
*/
public void fromRaw(long[] longs, int p) {
w1 = longs[p];
w2 = longs[p + 1];
w3 = longs[p + 2];
w4 = longs[p + 3];
}
/**
* Convert a LongObjectId from hex characters (US-ASCII).
*
* @param buf
* the US-ASCII buffer to read from. At least 32 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 a LongObjectId from hex characters.
*
* @param str
* the string to read from. Must be 64 characters long.
*/
public void fromString(String str) {
if (str.length() != Constants.LONG_OBJECT_ID_STRING_LENGTH)
throw new IllegalArgumentException(
MessageFormat.format(LfsText.get().invalidLongId, str));
fromHexString(org.eclipse.jgit.lib.Constants.encodeASCII(str), 0);
}
private void fromHexString(byte[] bs, int p) {
try {
w1 = RawParseUtils.parseHexInt64(bs, p);
w2 = RawParseUtils.parseHexInt64(bs, p + 16);
w3 = RawParseUtils.parseHexInt64(bs, p + 32);
w4 = RawParseUtils.parseHexInt64(bs, p + 48);
} catch (ArrayIndexOutOfBoundsException e) {
InvalidLongObjectIdException e1 = new InvalidLongObjectIdException(
bs, p, Constants.LONG_OBJECT_ID_STRING_LENGTH);
e1.initCause(e);
throw e1;
}
}
/** {@inheritDoc} */
@Override
public LongObjectId toObjectId() {
return new LongObjectId(this);
}
}
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