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/*
* 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.kin.stellarfork.codec
import org.kin.stellarfork.codec.StringUtils.getBytesUnchecked
import java.io.UnsupportedEncodingException
import java.nio.charset.Charset
/*
* 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.
*/ /**
* Converts hexadecimal Strings. The charset used for certain operation can be set, the default is set in
* [.DEFAULT_CHARSET_NAME]
*
* @author Apache Software Foundation
* @version $Id$
* @since 1.1
*/
class Hex : BinaryEncoder, BinaryDecoder {
/**
* Gets the charset name.
*
* @return the charset name.
* @since 1.4
*/
val charsetName: String
val charset: Charset
get() = Charset.forName(charsetName)
/**
* Creates a new codec with the default charset name [.DEFAULT_CHARSET_NAME]
*/
constructor() { // use default encoding
charsetName = DEFAULT_CHARSET_NAME
}
/**
* Creates a new codec with the given charset name.
*
* @param csName the charset name.
* @since 1.4
*/
constructor(csName: String) {
charsetName = csName
}
/**
* Converts an array of character bytes representing hexadecimal values into an array of bytes of those same values.
* The returned array will be half the length of the passed array, as it takes two characters to represent any given
* byte. An exception is thrown if the passed char array has an odd number of elements.
*
* @param source An array of character bytes containing hexadecimal digits
* @return A byte array containing binary data decoded from the supplied byte array (representing characters).
* @throws DecoderException Thrown if an odd number of characters is supplied to this function
* @see .decodeHex
*/
@Throws(DecoderException::class)
override fun decode(source: ByteArray?): ByteArray? {
if (source == null) { return source }
return try {
decodeHex(String(source, Charset.forName(charsetName)).toCharArray())
} catch (e: UnsupportedEncodingException) {
throw DecoderException(e.message, e)
}
}
/**
* Converts a String or an array of character bytes representing hexadecimal values into an array of bytes of those
* same values. The returned array will be half the length of the passed String or array, as it takes two characters
* to represent any given byte. An exception is thrown if the passed char array has an odd number of elements.
*
* @param source A String or, an array of character bytes containing hexadecimal digits
* @return A byte array containing binary data decoded from the supplied byte array (representing characters).
* @throws DecoderException Thrown if an odd number of characters is supplied to this function or the object is not a String or
* char[]
* @see .decodeHex
*/
@Throws(DecoderException::class)
override fun decode(source: Any?): ByteArray? {
return try {
val charArray =
if (source is String) source.toCharArray() else (source as CharArray)
decodeHex(charArray)
} catch (e: ClassCastException) {
throw DecoderException(e.message, e)
}
}
/**
* Converts an array of bytes into an array of bytes for the characters representing the hexadecimal values of each
* byte in order. The returned array will be double the length of the passed array, as it takes two characters to
* represent any given byte.
*
*
* The conversion from hexadecimal characters to the returned bytes is performed with the charset named by
* [.getCharsetName].
*
*
* @param source a byte[] to convert to Hex characters
* @return A byte[] containing the bytes of the hexadecimal characters
* @throws IllegalStateException if the charsetName is invalid. This API throws [IllegalStateException] instead of
* [UnsupportedEncodingException] for backward compatibility.
* @see .encodeHex
*/
override fun encode(source: ByteArray?): ByteArray? {
if (source == null) { return source }
return getBytesUnchecked(
encodeHexString(
source
), charsetName
)!!
}
/**
* Converts a String or an array of bytes into an array of characters representing the hexadecimal values of each
* byte in order. The returned array will be double the length of the passed String or array, as it takes two
* characters to represent any given byte.
*
*
* The conversion from hexadecimal characters to bytes to be encoded to performed with the charset named by
* [.getCharsetName].
*
*
* @param source a String, or byte[] to convert to Hex characters
* @return A char[] containing hexadecimal characters
* @throws EncoderException Thrown if the given object is not a String or byte[]
* @see .encodeHex
*/
@Throws(EncoderException::class)
override fun encode(source: Any?): CharArray? {
return try {
val byteArray =
if (source is String) source.toByteArray(
charset(charsetName)
) else (source as ByteArray)
encodeHex(byteArray)
} catch (e: ClassCastException) {
throw EncoderException(e.message, e)
} catch (e: UnsupportedEncodingException) {
throw EncoderException(e.message, e)
}
}
/**
* Returns a string representation of the object, which includes the charset name.
*
* @return a string representation of the object.
*/
override fun toString(): String {
return super.toString() + "[charsetName=" + charsetName + "]"
}
companion object {
/**
* Default charset name is [CharEncoding.UTF_8]
*
* @since 1.4
*/
const val DEFAULT_CHARSET_NAME = CharEncoding.UTF_8
/**
* Used to build output as Hex
*/
private val DIGITS_LOWER = charArrayOf(
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
)
/**
* Used to build output as Hex
*/
private val DIGITS_UPPER = charArrayOf(
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
)
/**
* Converts an array of characters representing hexadecimal values into an array of bytes of those same values. The
* returned array will be half the length of the passed array, as it takes two characters to represent any given
* byte. An exception is thrown if the passed char array has an odd number of elements.
*
* @param data An array of characters containing hexadecimal digits
* @return A byte array containing binary data decoded from the supplied char array.
* @throws DecoderException Thrown if an odd number or illegal of characters is supplied
*/
@JvmStatic
@Throws(DecoderException::class)
fun decodeHex(data: String): ByteArray = decodeHex(data.toCharArray())
/**
* Converts an array of characters representing hexadecimal values into an array of bytes of those same values. The
* returned array will be half the length of the passed array, as it takes two characters to represent any given
* byte. An exception is thrown if the passed char array has an odd number of elements.
*
* @param data An array of characters containing hexadecimal digits
* @return A byte array containing binary data decoded from the supplied char array.
* @throws DecoderException Thrown if an odd number or illegal of characters is supplied
*/
@Throws(DecoderException::class)
@JvmStatic
fun decodeHex(data: CharArray): ByteArray {
val len = data.size
if (len and 0x01 != 0) {
throw DecoderException("Odd number of characters.")
}
val out = ByteArray(len shr 1)
// two characters form the hex value.
var i = 0
var j = 0
while (j < len) {
var f = toDigit(data[j], j) shl 4
j++
f = f or toDigit(data[j], j)
j++
out[i] = (f and 0xFF).toByte()
i++
}
return out
}
/**
* Converts an array of bytes into an array of characters representing the hexadecimal values of each byte in order.
* The returned array will be double the length of the passed array, as it takes two characters to represent any
* given byte.
*
* @param data a byte[] to convert to Hex characters
* @param toLowerCase `true` converts to lowercase, `false` to uppercase
* @return A char[] containing hexadecimal characters
* @since 1.4
*/
/**
* Converts an array of bytes into an array of characters representing the hexadecimal values of each byte in order.
* The returned array will be double the length of the passed array, as it takes two characters to represent any
* given byte.
*
* @param data a byte[] to convert to Hex characters
* @return A char[] containing hexadecimal characters
*/
@JvmOverloads
@JvmStatic
fun encodeHex(data: ByteArray, toLowerCase: Boolean = true): CharArray {
return encodeHex(
data,
if (toLowerCase) DIGITS_LOWER else DIGITS_UPPER
)
}
/**
* Converts an array of bytes into an array of characters representing the hexadecimal values of each byte in order.
* The returned array will be double the length of the passed array, as it takes two characters to represent any
* given byte.
*
* @param data a byte[] to convert to Hex characters
* @param toDigits the output alphabet
* @return A char[] containing hexadecimal characters
* @since 1.4
*/
@JvmStatic
protected fun encodeHex(data: ByteArray, toDigits: CharArray): CharArray {
val l = data.size
val out = CharArray(l shl 1)
// two characters form the hex value.
var i = 0
var j = 0
while (i < l) {
out[j++] = toDigits[0xF0 and data[i].toInt() ushr 4]
out[j++] = toDigits[0x0F and data[i].toInt()]
i++
}
return out
}
/**
* Converts an array of bytes into a String representing the hexadecimal values of each byte in order. The returned
* String will be double the length of the passed array, as it takes two characters to represent any given byte.
*
* @param data a byte[] to convert to Hex characters
* @return A String containing hexadecimal characters
* @since 1.4
*/
@JvmStatic
fun encodeHexString(data: ByteArray): String {
return String(encodeHex(data))
}
/**
* Converts a hexadecimal character to an integer.
*
* @param ch A character to convert to an integer digit
* @param index The index of the character in the source
* @return An integer
* @throws DecoderException Thrown if ch is an illegal hex character
*/
@Throws(DecoderException::class)
@JvmStatic
protected fun toDigit(ch: Char, index: Int): Int {
val digit = Character.digit(ch, 16)
if (digit == -1) {
throw DecoderException("Illegal hexadecimal character $ch at index $index")
}
return digit
}
}
}
