Added hex
This commit is contained in:
Robinson
parent
57e9f3ffd3
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4a22e3335f
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/*
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* MIT License
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*
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* Copyright (c) 2017 ligi
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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package dorkbox.bytes
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@JvmInline
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public value class HexString(val string: String)
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object Hex {
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/**
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* Represents all the chars used for nibble
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*/
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private const val CHARS = "0123456789abcdef"
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internal val HEX_REGEX = Regex("(0[xX])?[0-9a-fA-F]*")
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/**
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* Encodes the given byte value as an hexadecimal character.
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*/
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fun encode(value: Byte): String {
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return CHARS[value.toInt().shr(4) and 0x0f].toString() + CHARS[value.toInt().and(0x0f)].toString()
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}
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/**
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* Encodes the given byte array value to its hexadecimal representations, and prepends the given prefix to it.
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*
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* Note that by default the 0x prefix is prepended to the result of the conversion.
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* If you want to have the representation without the 0x prefix, pass to this method an empty prefix.
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*/
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fun encode(value: ByteArray, prefix: String = "0x"): String {
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return prefix + value.joinToString("") { encode(it) }
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}
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/**
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* Converts the given ch into its integer representation considering it as an hexadecimal character.
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*/
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private fun hexToBin(ch: Char): Int = when (ch) {
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in '0'..'9' -> ch - '0'
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in 'A'..'F' -> ch - 'A' + 10
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in 'a'..'f' -> ch - 'a' + 10
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else -> throw(IllegalArgumentException("'$ch' is not a valid hex character"))
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}
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/**
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* Parses the given value reading it as an hexadecimal string, and returns its byte array representation.
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*
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* Note that either 0x-prefixed string and no-prefixed hex strings are supported.
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*
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* @throws IllegalArgumentException if the value is not a hexadecimal string.
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*/
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fun decode(value: String): ByteArray {
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// An hex string must always have length multiple of 2
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if (value.length % 2 != 0) {
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throw IllegalArgumentException("hex-string must have an even number of digits (nibbles)")
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}
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// Remove the 0x prefix if it is set
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val cleanInput = if (value.startsWith("0x")) value.substring(2) else value
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return ByteArray(cleanInput.length / 2).apply {
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var i = 0
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while (i < cleanInput.length) {
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this[i / 2] = ((hexToBin(cleanInput[i]) shl 4) + hexToBin(cleanInput[i + 1])).toByte()
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i += 2
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}
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}
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}
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}
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@ -0,0 +1,115 @@
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/*
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* MIT License
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*
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* Copyright (c) 2017 ligi
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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package dorkbox.bytes
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/**
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* Converts [this] [ByteArray] into its hexadecimal string representation prepending to it the given [prefix].
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*
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* Note that by default the 0x prefix is prepended to the result of the conversion.
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* If you want to have the representation without the 0x prefix, use the [toNoPrefixHexString] method or
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* pass to this method an empty [prefix].
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*/
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public fun ByteArray.toHexString(prefix: String = "0x"): String = Hex.encode(this, prefix)
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/**
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* Converts [this] [ByteArray] into its hexadecimal representation without prepending any prefix to it.
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*/
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public fun ByteArray.toNoPrefixHexString(): String = toHexString(prefix = "")
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/**
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* Converts [this] [Collection] of bytes into its hexadecimal string representation prepending to it the given [prefix].
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*
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* Note that by default the 0x prefix is prepended to the result of the conversion.
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* If you want to have the representation without the 0x prefix, use the [toNoPrefixHexString] method or
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* pass to this method an empty [prefix].
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*/
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public fun Collection<Byte>.toHexString(prefix: String = "0x"): String = Hex.encode(this.toByteArray(), prefix)
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/**
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* Converts [this] [Collection] of bytes into its hexadecimal representation without prepending any prefix to it.
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*/
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public fun Collection<Byte>.toNoPrefixHexString(): String = toHexString("")
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/**
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* Parses [this] [String] as an hexadecimal value and returns its [ByteArray] representation.
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*
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* Note that either 0x-prefixed string and no-prefixed hex strings are supported.
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*
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* @throws IllegalArgumentException if [this] is not a hexadecimal string.
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*/
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public fun HexString.hexToByteArray(): ByteArray = Hex.decode(string)
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public fun String.hexToByteArray(): ByteArray = Hex.decode(this)
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/**
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* Returns `true` if and only if [this] value starts with the `0x` prefix.
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*/
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public fun HexString.has0xPrefix(): Boolean = string.startsWith("0x")
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public fun String.has0xPrefix(): Boolean = this.startsWith("0x")
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/**
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* Returns a new [String] obtained by prepends the `0x` prefix to [this] value,
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* only if it does not already have it.
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*
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* Examples:
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* ```kotlin
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* val myString = HexString("123")
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* assertEquals("0x123", myString.prepend0xPrefix().string)
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* assertEquals("0x0x123", myString.prepend0xPrefix().prepend0xPrefix().string)
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* ```
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*/
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public fun HexString.prepend0xPrefix(): HexString = if (has0xPrefix()) this else HexString("0x$string")
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public fun String.prepend0xPrefix(): String = if (has0xPrefix()) this else "0x$this"
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/**
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* Returns a new [String] obtained by removing the first occurrence of the `0x` prefix from [this] string, if it has it.
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*
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* Examples:
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* ```kotlin
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* assertEquals("123", HexString("123").clean0xPrefix().string)
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* assertEquals("123", HexString("0x123").clean0xPrefix().string)
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* assertEquals("0x123", HexString("0x0x123").clean0xPrefix().string)
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* ```
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*/
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public fun HexString.clean0xPrefix(): HexString = if (has0xPrefix()) HexString(string.substring(2)) else this
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public fun String.clean0xPrefix(): String = if (has0xPrefix()) this.substring(2) else this
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/**
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* Returns if a given string is a valid hex-string - either with or without 0x prefix
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*/
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public fun HexString.isValidHex(): Boolean = Hex.HEX_REGEX.matches(string)
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public fun String.isValidHex(): Boolean = Hex.HEX_REGEX.matches(this)
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/**
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* Returns a HexString if a given string is a valid hex-string - either with or without 0x prefix
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*/
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public fun String.toHex(): HexString {
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if (!this.isValidHex()) {
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throw IllegalArgumentException("String is not hex")
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}
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return HexString(this)
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}
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@ -0,0 +1,120 @@
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/*
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* Copyright 2021 dorkbox, llc
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package dorkbox.bytes
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import org.junit.Assert.*
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import org.junit.Test
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class TestHex {
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private val hexRegex = Regex("0[xX][0-9a-fA-F]+")
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@Test
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fun weCanProduceSingleDigitHex() {
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assertEquals(Hex.encode(0.toByte()), "00")
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assertEquals(Hex.encode(1.toByte()), "01")
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assertEquals(Hex.encode(15.toByte()), "0f")
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}
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@Test
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fun weCanProduceDoubleDigitHex() {
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assertEquals(Hex.encode(16.toByte()), "10")
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assertEquals(Hex.encode(42.toByte()), "2a")
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assertEquals(Hex.encode(255.toByte()), "ff")
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}
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@Test
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fun prefixIsIgnored() {
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assertTrue(Hex.decode("0xab").contentEquals(Hex.decode("ab")))
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}
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@Test
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fun sizesAreOk() {
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assertEquals(Hex.decode("0x").size, 0)
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assertEquals(Hex.decode("ff").size, 1)
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assertEquals(Hex.decode("ffaa").size, 2)
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assertEquals(Hex.decode("ffaabb").size, 3)
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assertEquals(Hex.decode("ffaabb44").size, 4)
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assertEquals(Hex.decode("0xffaabb4455").size, 5)
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assertEquals(Hex.decode("0xffaabb445566").size, 6)
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assertEquals(Hex.decode("ffaabb44556677").size, 7)
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}
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@Test
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fun exceptionOnOddInput() {
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var exception: Exception? = null
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try {
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Hex.decode("0xa")
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} catch (e: Exception) {
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exception = e
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}
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assertTrue("Exception must be IllegalArgumentException", exception is IllegalArgumentException)
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}
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@Test
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fun testRoundTrip() {
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assertEquals(Hex.encode(Hex.decode("00")), "0x00")
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assertEquals(Hex.encode(Hex.decode("ff")), "0xff")
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assertEquals(Hex.encode(Hex.decode("abcdef")), "0xabcdef")
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assertEquals(Hex.encode(Hex.decode("0xaa12456789bb")), "0xaa12456789bb")
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}
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@Test
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fun regexMatchesForHEX() {
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assertTrue(hexRegex.matches("0x00"))
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assertTrue(hexRegex.matches("0xabcdef123456"))
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}
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@Test
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fun regexFailsForNonHEX() {
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assertFalse(hexRegex.matches("q"))
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assertFalse(hexRegex.matches(""))
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assertFalse(hexRegex.matches("0x+"))
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assertFalse(hexRegex.matches("0xgg"))
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}
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@Test
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fun detectsInvalidHex() {
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var exception: Exception? = null
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try {
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Hex.decode("0xxx")
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} catch (e: Exception) {
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exception = e
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}
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assertTrue("Exception must be IllegalArgumentException", exception is IllegalArgumentException)
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}
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@Test
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fun testHexString() {
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val myString = HexString("123")
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assertEquals("0x123", myString.prepend0xPrefix().string)
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assertEquals("0x123", myString.prepend0xPrefix().prepend0xPrefix().string)
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assertEquals("123", HexString("123").clean0xPrefix().string)
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assertEquals("123", HexString("0x123").clean0xPrefix().string)
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assertEquals("0x123", HexString("0x0x123").clean0xPrefix().string)
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}
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@Test
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fun testStringAsHex() {
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assertEquals("0x123", "123".prepend0xPrefix())
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assertEquals("0x123", "123".prepend0xPrefix().prepend0xPrefix())
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assertEquals("123", "123".clean0xPrefix())
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assertEquals("123", "0x123".clean0xPrefix())
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assertEquals("0x123", "0x0x123".clean0xPrefix())
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}
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}
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