eo-runtime/src/main/java/org/eolang/BytesOf.java
/*
* The MIT License (MIT)
*
* Copyright (c) 2016-2024 Objectionary.com
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
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* SOFTWARE.
*/
package org.eolang;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
/**
* Bytes.
*
* @since 1.0
*/
@Versionized
public final class BytesOf implements Bytes {
/**
* Binary data.
*/
private final byte[] data;
/**
* Ctor.
* @param data Data.
*/
public BytesOf(final byte[] data) {
this.data = data;
}
/**
* Ctor.
* @param str UTF-8 Text.
*/
public BytesOf(final String str) {
this(str.getBytes(StandardCharsets.UTF_8));
}
/**
* Ctor.
* @param number Integer number.
*/
public BytesOf(final int number) {
this(ByteBuffer.allocate(Integer.BYTES).putInt(number).array());
}
/**
* Ctor.
* @param chr Character.
*/
public BytesOf(final char chr) {
this(ByteBuffer.allocate(Character.BYTES).putChar(chr).array());
}
/**
* Ctor.
* @param number Long number.
*/
public BytesOf(final long number) {
this(ByteBuffer.allocate(Long.BYTES).putLong(number).array());
}
/**
* Ctor.
* @param number Double number.
*/
public BytesOf(final double number) {
this(ByteBuffer.allocate(Double.BYTES).putDouble(number).array());
}
@Override
public Bytes not() {
final byte[] copy = this.take();
for (int index = 0; index < copy.length; index += 1) {
copy[index] = (byte) ~copy[index];
}
return new BytesOf(copy);
}
@Override
public Bytes and(final Bytes other) {
final byte[] first = this.take();
final byte[] second = other.take();
for (int index = 0; index < Math.min(first.length, second.length); index += 1) {
first[index] = (byte) (first[index] & second[index]);
}
return new BytesOf(first);
}
@Override
public Bytes or(final Bytes other) {
final byte[] first = this.take();
final byte[] second = other.take();
for (int index = 0; index < Math.min(first.length, second.length); index += 1) {
first[index] = (byte) (first[index] | second[index]);
}
return new BytesOf(first);
}
@Override
public Bytes xor(final Bytes other) {
final byte[] first = this.take();
final byte[] second = other.take();
for (int index = 0; index < Math.min(first.length, second.length); index += 1) {
first[index] = (byte) (first[index] ^ second[index]);
}
return new BytesOf(first);
}
@Override
public Bytes shift(final int bits) {
// @checkstyle MethodBodyCommentsCheck (3 lines)
// @checkstyle NestedIfDepthCheck (40 lines)
final byte[] bytes = this.take();
final int mod = Math.abs(bits) % Byte.SIZE;
final int offset = Math.abs(bits) / Byte.SIZE;
if (bits < 0) {
final byte carry = (byte) ((0x01 << mod) - 1);
for (int index = 0; index < bytes.length; index += 1) {
final int source = index + offset;
if (source >= bytes.length) {
bytes[index] = 0;
} else {
byte dst = (byte) (bytes[source] << mod);
if (source + 1 < bytes.length) {
dst |= bytes[source + 1] >>> (Byte.SIZE - mod) & (carry & 0xFF);
}
bytes[index] = dst;
}
}
} else {
final byte carry = (byte) (0xFF << (Byte.SIZE - mod));
for (int index = bytes.length - 1; index >= 0; index -= 1) {
final int source = index - offset;
if (source < 0) {
bytes[index] = 0;
} else {
byte dst = (byte) ((0xff & bytes[source]) >>> mod);
if (source - 1 >= 0) {
dst |= bytes[source - 1] << (Byte.SIZE - mod) & (carry & 0xFF);
}
bytes[index] = dst;
}
}
}
return new BytesOf(bytes);
}
@Override
public Bytes sshift(final int bits) {
if (bits < 0) {
throw new UnsupportedOperationException("right sshift is NYI");
}
final byte[] bytes = this.shift(bits).take();
if (this.take()[0] < 0) {
for (int index = 0; index < bytes.length; index += 1) {
final int zeros = BytesOf.numberOfLeadingZeros(
bytes[index]
);
bytes[index] = (byte) (bytes[index] & 0xFF ^ (-1 << (Byte.SIZE - zeros)));
if (zeros != Byte.SIZE) {
break;
}
}
}
return new BytesOf(bytes);
}
@Override
public <T extends Number> T asNumber(final Class<T> type) {
final byte[] ret = this.take();
final Object res;
final ByteBuffer buf = ByteBuffer.wrap(ret);
if (Long.class.equals(type)
&& ret.length == Long.BYTES) {
res = buf.getLong();
} else if (Integer.class.equals(type)
&& ret.length == Integer.BYTES
) {
res = buf.getInt();
} else if (Double.class.equals(type)
&& ret.length == Double.BYTES
) {
res = buf.getDouble();
} else {
throw new UnsupportedOperationException(
String.format(
"Unsupported conversion to '%s' for %d bytes",
type,
ret.length
)
);
}
return type.cast(res);
}
@Override
public String asString() {
final StringBuilder out = new StringBuilder(0);
for (final byte bte : this.data) {
if (out.length() > 0) {
out.append('-');
}
out.append(String.format("%02X", bte));
}
if (this.data.length == 0) {
out.append("--");
}
return out.toString();
}
@Override
public byte[] take() {
return Arrays.copyOf(this.data, this.data.length);
}
@Override
public String toString() {
return String.format("BytesOf{%s}", Arrays.toString(this.data));
}
@Override
public boolean equals(final Object other) {
final boolean result;
if (this == other) {
result = true;
} else if (other instanceof Bytes) {
result = Arrays.equals(this.data, ((Bytes) other).take());
} else {
result = false;
}
return result;
}
@Override
public int hashCode() {
return Arrays.hashCode(this.data);
}
/**
* Count leading zero bits.
* @param num Byte.
* @return Number between 0 and 8.
*/
private static byte numberOfLeadingZeros(final byte num) {
final byte result;
if (num == 0) {
result = (byte) Byte.SIZE;
} else if (num < 0) {
result = (byte) 0;
} else {
byte temp = num;
int bts = Byte.SIZE - 1;
if (temp >= 1 << 4) {
bts -= 4;
temp >>>= 4;
}
if (temp >= 1 << 2) {
bts -= 2;
temp >>>= 2;
}
result = (byte) (bts - (temp >>> 1));
}
return result;
}
}