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[Utils] Update CRC16 generation method.

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Kuba Szczodrzyński 2019-10-27 21:25:01 +01:00
parent 42f70da162
commit f452a1b81c
1 changed files with 14 additions and 2 deletions
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16
app/src/main/java/pl/szczodrzynski/edziennik/Extensions.kt
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@ -18,7 +18,6 @@ import pl.szczodrzynski.edziennik.data.db.modules.profiles.Profile
import pl.szczodrzynski.edziennik.data.db.modules.teachers.Teacher import pl.szczodrzynski.edziennik.data.db.modules.teachers.Teacher
import pl.szczodrzynski.edziennik.data.db.modules.teams.Team import pl.szczodrzynski.edziennik.data.db.modules.teams.Team
import pl.szczodrzynski.navlib.R import pl.szczodrzynski.navlib.R
import pl.szczodrzynski.navlib.crc16
import pl.szczodrzynski.navlib.getColorFromRes import pl.szczodrzynski.navlib.getColorFromRes
import java.text.SimpleDateFormat import java.text.SimpleDateFormat
import java.util.* import java.util.*
@ -118,7 +117,7 @@ fun List<String>.join(delimiter: String): String {
} }
fun colorFromName(context: Context, name: String?): Int { fun colorFromName(context: Context, name: String?): Int {
var crc = crc16(name ?: "") var crc = (name ?: "").crc16()
crc = (crc and 0xff) or (crc shr 8) crc = (crc and 0xff) or (crc shr 8)
crc %= 16 crc %= 16
val color = when (crc) { val color = when (crc) {
@ -305,4 +304,17 @@ fun initDefaultLocale() {
}.let { }.let {
Locale.setDefault(it) Locale.setDefault(it)
} }
}
fun String.crc16(): Int {
var crc = 0xFFFF
for (aBuffer in this) {
crc = crc.ushr(8) or (crc shl 8) and 0xffff
crc = crc xor (aBuffer.toInt() and 0xff) // byte to int, trunc sign
crc = crc xor (crc and 0xff shr 4)
crc = crc xor (crc shl 12 and 0xffff)
crc = crc xor (crc and 0xFF shl 5 and 0xffff)
}
crc = crc and 0xffff
return crc + 32768
} }