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/**
* Utils.kt
*
* Copyright (C) 2011 Eric Butler
* Copyright (C) 2019 <seil0@mosad.xyz>
*
* Authors:
* Eric Butler <eric@codebutler.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.codebutler.farebot
import android.app.Activity
import android.app.AlertDialog
import android.util.Log
import android.view.WindowManager
import com.codebutler.farebot.card.desfire.DesfireException
import com.codebutler.farebot.card.desfire.DesfireFileSettings
import com.codebutler.farebot.card.desfire.DesfireProtocol
import org.w3c.dom.Node
import java.io.StringWriter
import javax.xml.transform.OutputKeys
import javax.xml.transform.TransformerFactory
import javax.xml.transform.dom.DOMSource
import javax.xml.transform.stream.StreamResult
import kotlin.experimental.and
class Utils {
companion object {
private val TAG = Utils::class.java.name
@Suppress("unused")
fun showError(activity: Activity, ex: Exception) {
Log.e(activity.javaClass.name, ex.message, ex)
AlertDialog.Builder(activity)
.setMessage(getErrorMessage(ex))
.show()
}
@Suppress("unused")
fun showErrorAndFinish(activity: Activity, ex: Exception) {
try {
Log.e(activity.javaClass.name, getErrorMessage(ex))
ex.printStackTrace()
AlertDialog.Builder(activity)
.setMessage(getErrorMessage(ex))
.setCancelable(false)
.setPositiveButton(android.R.string.ok) { _, _ -> activity.finish() }
.show()
} catch (unused: WindowManager.BadTokenException) {
/* Ignore... happens if the activity was destroyed */
}
}
@Throws(Exception::class)
fun getHexString(b: ByteArray): String {
var result = ""
for (i in b.indices) {
result += ((b[i] and 0xff.toByte()) + 0x100).toString(16).substring(1)
}
return result
}
@Suppress("unused")
fun getHexString(b: ByteArray, defaultResult: String): String {
return try {
getHexString(b)
} catch (ex: Exception) {
defaultResult
}
}
@Suppress("unused")
fun hexStringToByteArray(s: String): ByteArray {
if (s.length % 2 != 0) {
throw IllegalArgumentException("Bad input string: $s")
}
val len = s.length
val data = ByteArray(len / 2)
var i = 0
while (i < len) {
data[i / 2] = ((Character.digit(s[i], 16) shl 4) + Character.digit(s[i + 1], 16)).toByte()
i += 2
}
return data
}
@JvmOverloads
fun byteArrayToInt(b: ByteArray, offset: Int = 0, length: Int = b.size): Int {
return byteArrayToLong(b, offset, length).toInt()
}
fun byteArrayToLong(b: ByteArray, offset: Int, length: Int): Long {
if (b.size < length)
throw IllegalArgumentException("length must be less than or equal to b.length")
var value: Long = 0
for (i in 0 until length) {
val shift = (length - 1 - i) * 8
value += ((b[i + offset].toInt() and 0x000000FF).toLong() shl shift)
}
return value
}
@Suppress("unused")
fun byteArraySlice(b: ByteArray, offset: Int, length: Int): ByteArray {
val ret = ByteArray(length)
for (i in 0 until length)
ret[i] = b[offset + i]
return ret
}
@Suppress("unused")
@Throws(Exception::class)
fun xmlNodeToString(node: Node): String {
// The amount of code required to do simple things in Java is incredible.
val source = DOMSource(node)
val stringWriter = StringWriter()
val result = StreamResult(stringWriter)
val factory = TransformerFactory.newInstance()
val transformer = factory.newTransformer()
transformer.setOutputProperty(OutputKeys.INDENT, "yes")
transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2")
transformer.uriResolver = null
transformer.transform(source, result)
return stringWriter.buffer.toString()
}
fun getErrorMessage(ex: Throwable): String {
var errorMessage: String? = ex.localizedMessage
if (errorMessage == null)
errorMessage = ex.message
if (errorMessage == null)
errorMessage = ex.toString()
if (ex.cause != null) {
var causeMessage: String? = ex.cause!!.localizedMessage
if (causeMessage == null)
causeMessage = ex.cause!!.message
if (causeMessage == null)
causeMessage = ex.cause.toString()
errorMessage += ": $causeMessage"
}
return errorMessage
}
@Suppress("unused")
fun <T> findInList(list: List<T>, matcher: Matcher<T>): T? {
for (item in list) {
if (matcher.matches(item)) {
return item
}
}
return null
}
interface Matcher<T> {
fun matches(t: T): Boolean
}
fun selectAppFile(tag: DesfireProtocol, appID: Int, fileID: Int): DesfireFileSettings? {
try {
tag.selectApp(appID)
} catch (e: DesfireException) {
Log.w(TAG, "App not found")
return null
}
return try {
tag.getFileSettings(fileID)
} catch (e: DesfireException) {
Log.w(TAG, "File not found")
null
}
}
fun arrayContains(arr: IntArray, item: Int): Boolean {
for (i in arr)
if (i == item)
return true
return false
}
@Suppress("unused")
fun containsAppFile(tag: DesfireProtocol, appID: Int, fileID: Int): Boolean {
try {
tag.selectApp(appID)
} catch (e: DesfireException) {
Log.w(TAG, "App not found")
Log.w(TAG, e)
return false
}
return try {
arrayContains(tag.fileList, fileID)
} catch (e: DesfireException) {
Log.w(TAG, "File not found")
Log.w(TAG, e)
false
}
}
}
}

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