| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE |
| * file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file |
| * to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the |
| * License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on |
| * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations under the License. |
| */ |
| package org.apache.tuweni.bytes; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| import static com.google.common.base.Preconditions.checkElementIndex; |
| |
| import java.nio.ByteBuffer; |
| import java.security.MessageDigest; |
| import java.util.Arrays; |
| |
| import io.vertx.core.buffer.Buffer; |
| |
| class ArrayWrappingBytes extends AbstractBytes { |
| |
| protected final byte[] bytes; |
| protected final int offset; |
| protected final int length; |
| |
| ArrayWrappingBytes(byte[] bytes) { |
| this(bytes, 0, bytes.length); |
| } |
| |
| ArrayWrappingBytes(byte[] bytes, int offset, int length) { |
| checkArgument(length >= 0, "Invalid negative length"); |
| if (bytes.length > 0) { |
| checkElementIndex(offset, bytes.length); |
| } |
| checkArgument( |
| offset + length <= bytes.length, |
| "Provided length %s is too big: the value has only %s bytes from offset %s", |
| length, |
| bytes.length - offset, |
| offset); |
| |
| this.bytes = bytes; |
| this.offset = offset; |
| this.length = length; |
| } |
| |
| @Override |
| public int size() { |
| return length; |
| } |
| |
| @Override |
| public byte get(int i) { |
| // Check bounds because while the array access would throw, the error message would be confusing |
| // for the caller. |
| checkElementIndex(i, size()); |
| return bytes[offset + i]; |
| } |
| |
| @Override |
| public Bytes slice(int i, int length) { |
| if (i == 0 && length == this.length) { |
| return this; |
| } |
| if (length == 0) { |
| return Bytes.EMPTY; |
| } |
| |
| checkElementIndex(i, this.length); |
| checkArgument( |
| i + length <= this.length, |
| "Provided length %s is too big: the value has size %s and has only %s bytes from %s", |
| length, |
| this.length, |
| this.length - i, |
| i); |
| |
| return length == Bytes32.SIZE ? new ArrayWrappingBytes32(bytes, offset + i) |
| : new ArrayWrappingBytes(bytes, offset + i, length); |
| } |
| |
| // MUST be overridden by mutable implementations |
| @Override |
| public Bytes copy() { |
| if (offset == 0 && length == bytes.length) { |
| return this; |
| } |
| return new ArrayWrappingBytes(toArray()); |
| } |
| |
| @Override |
| public MutableBytes mutableCopy() { |
| return new MutableArrayWrappingBytes(toArray()); |
| } |
| |
| @Override |
| public int commonPrefixLength(Bytes other) { |
| if (!(other instanceof ArrayWrappingBytes)) { |
| return super.commonPrefixLength(other); |
| } |
| ArrayWrappingBytes o = (ArrayWrappingBytes) other; |
| int i = 0; |
| while (i < length && i < o.length && bytes[offset + i] == o.bytes[o.offset + i]) { |
| i++; |
| } |
| return i; |
| } |
| |
| @Override |
| public void update(MessageDigest digest) { |
| digest.update(bytes, offset, length); |
| } |
| |
| @Override |
| public void copyTo(MutableBytes destination, int destinationOffset) { |
| if (!(destination instanceof MutableArrayWrappingBytes)) { |
| super.copyTo(destination, destinationOffset); |
| return; |
| } |
| |
| int size = size(); |
| if (size == 0) { |
| return; |
| } |
| |
| checkElementIndex(destinationOffset, destination.size()); |
| checkArgument( |
| destination.size() - destinationOffset >= size, |
| "Cannot copy %s bytes, destination has only %s bytes from index %s", |
| size, |
| destination.size() - destinationOffset, |
| destinationOffset); |
| |
| MutableArrayWrappingBytes d = (MutableArrayWrappingBytes) destination; |
| System.arraycopy(bytes, offset, d.bytes, d.offset + destinationOffset, size); |
| } |
| |
| @Override |
| public void appendTo(ByteBuffer byteBuffer) { |
| byteBuffer.put(bytes, offset, length); |
| } |
| |
| @Override |
| public void appendTo(Buffer buffer) { |
| buffer.appendBytes(bytes, offset, length); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (obj == this) { |
| return true; |
| } |
| if (!(obj instanceof ArrayWrappingBytes)) { |
| return super.equals(obj); |
| } |
| ArrayWrappingBytes other = (ArrayWrappingBytes) obj; |
| if (length != other.length) { |
| return false; |
| } |
| for (int i = 0; i < length; ++i) { |
| if (bytes[offset + i] != other.bytes[other.offset + i]) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| @Override |
| public int hashCode() { |
| int result = 1; |
| int size = size(); |
| for (int i = 0; i < size; i++) { |
| result = 31 * result + bytes[offset + i]; |
| } |
| return result; |
| } |
| |
| @Override |
| public byte[] toArray() { |
| return Arrays.copyOfRange(bytes, offset, offset + length); |
| } |
| |
| @Override |
| public byte[] toArrayUnsafe() { |
| if (offset == 0 && length == bytes.length) { |
| return bytes; |
| } |
| return toArray(); |
| } |
| } |