2019-08-30 14:17:07 +02:00
/ * *
* Utils . kt
2019-08-19 12:42:56 +02:00
*
* Copyright ( C ) 2011 Eric Butler
2019-08-30 14:17:07 +02:00
* Copyright ( C ) 2019 < seil0 @mosad . xyz >
2019-08-19 12:42:56 +02:00
*
* 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
}
}
}
}