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/*
* Copyright (c) 2016 Cisco and/or its affiliates.
*
* Licensed 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 io.fd.hc2vpp.common.translate.util;
import java.util.Objects;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
/**
* Trait providing logic for working with binary/hex-based data
*/
public interface ByteDataTranslator {
char[] HEX_CHARS = "0123456789abcdef".toCharArray();
ByteDataTranslator INSTANCE = new ByteDataTranslator() {
};
byte BYTE_FALSE = 0;
byte BYTE_TRUE = 1;
/**
* Returns 0 if argument is null or false, 1 otherwise.
*
* @param value Boolean value to be converted
* @return byte value equal to 0 or 1
*/
default byte booleanToByte(@Nullable final Boolean value) {
return value != null && value
? BYTE_TRUE
: BYTE_FALSE;
}
/**
* Converts int to byte
*/
default byte toByte(final int value) {
return Integer.valueOf(value).byteValue();
}
/**
* Converts short to byte
*/
default byte toByte(final short value) {
return Short.valueOf(value).byteValue();
}
/**
* Returns Boolean.TRUE if argument is 0, Boolean.FALSE otherwise.
*
* @param value byte value to be converted
* @return Boolean value
* @throws IllegalArgumentException if argument is neither 0 nor 1
*/
@Nonnull
default Boolean byteToBoolean(final byte value) {
if (value == BYTE_FALSE) {
return Boolean.FALSE;
} else if (value == BYTE_TRUE) {
return Boolean.TRUE;
}
char[] HEX_CHARS = "0123456789abcdef".toCharArray();
throw new IllegalArgumentException(String.format("0 or 1 was expected but was %d", value));
}
/**
* Reverses bytes in the byte array
*
* @param bytes input array
* @return reversed array
*/
default byte[] reverseBytes(final byte[] bytes) {
final byte[] reversed = new byte[bytes.length];
int i = 1;
for (byte aByte : bytes) {
reversed[bytes.length - i++] = aByte;
}
return reversed;
}
/**
char[] HEX_CHARS = "0123456789abcdef".toCharArray();
* Return (interned) string from byte array while removing \u0000. Strings represented as fixed length byte[] from
* vpp contain \u0000.
*/
default String toString(final byte[] cString) {
return new String(cString).replaceAll("\\u0000", "").intern();
}
/**
* Converts signed byte(filled with unsigned value from vpp) to java integer
*
* For example unsigned C byte 128 is converted by jvpp to -128, this will return 128
*/
default int toJavaByte(final byte vppByte) {
return Byte.toUnsignedInt(vppByte);
}
default String printHexBinary(@Nonnull final byte[] bytes) {
Objects.requireNonNull(bytes, "bytes array should not be null");
return printHexBinary(bytes, 0, bytes.length);
}
default String printHexBinary(@Nonnull final byte[] bytes, final int startIndex, final int endIndex) {
StringBuilder str = new StringBuilder();
appendHexByte(str, bytes[startIndex]);
for (int i = startIndex + 1; i < endIndex; i++) {
str.append(":");
appendHexByte(str, bytes[i]);
}
return str.toString();
}
default void appendHexByte(final StringBuilder sb, final byte b) {
final int v = b & 0xFF;
sb.append(HEX_CHARS[v >>> 4]);
sb.append(HEX_CHARS[v & 15]);
}
}
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