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Fix frequency calculations

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This commit is contained in:
Mygod
2020-07-02 08:39:42 +08:00
parent 71e0ab6ed1
commit 4c5265f0c2
4 changed files with 60 additions and 29 deletions
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36
mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/SoftApConfigurationCompat.kt
View File

@@ -53,17 +53,35 @@ data class SoftApConfigurationCompat(
private val qrSanitizer = Regex("([\\\\\":;,])")
/**
* The frequency which AP resides on (MHz). Resides in range [2412, 5815].
* Based on:
* https://elixir.bootlin.com/linux/v5.7.6/source/net/wireless/util.c#L75
* TODO [com.android.server.wifi.util.ApConfigUtil]
*/
fun channelToFrequency(channel: Int) = when (channel) {
in 1..14 -> 2407 + 5 * channel
in 15..165 -> 5000 + 5 * channel
else -> throw IllegalArgumentException("Invalid channel $channel")
fun channelToFrequency(band: Int, chan: Int) = when (band) {
BAND_2GHZ -> when (chan) {
14 -> 2484
in 1 until 14 -> 2407 + chan * 5
else -> throw IllegalArgumentException("Invalid 2GHz channel $chan")
}
BAND_5GHZ -> when (chan) {
in 182..196 -> 4000 + chan * 5
in 1..Int.MAX_VALUE -> 5000 + chan * 5
else -> throw IllegalArgumentException("Invalid 5GHz channel $chan")
}
BAND_6GHZ -> if (chan in 1..253) {
5940 + chan * 5
} else throw IllegalArgumentException("Invalid 6GHz channel $chan")
// BAND_60GHZ -> if (chan in 1 until 7) 56160 + chan * 2160
else -> throw IllegalArgumentException("Invalid band $band")
}
fun frequencyToChannel(frequency: Int) = when (frequency % 5) {
2 -> ((frequency - 2407) / 5).also { check(it in 1..14) { "Invalid 2.4 GHz frequency $frequency" } }
0 -> ((frequency - 5000) / 5).also { check(it in 15..165) { "Invalid 5 GHz frequency $frequency" } }
else -> throw IllegalArgumentException("Invalid frequency $frequency")
fun frequencyToChannel(freq: Int) = when (freq) {
2484 -> 14
in Int.MIN_VALUE until 2484 -> (freq - 2407) / 5
in 4910..4980 -> (freq - 4000) / 5
in Int.MIN_VALUE until 5945 -> (freq - 5000) / 5
in Int.MIN_VALUE..45000 -> (freq - 5940) / 5
in 58320..70200 -> (freq - 56160) / 2160
else -> throw IllegalArgumentException("Invalid frequency $freq")
}
/**

26
mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/WifiApDialogFragment.kt
View File

@@ -41,7 +41,24 @@ class WifiApDialogFragment : AlertDialogFragment<WifiApDialogFragment.Arg, WifiA
Toolbar.OnMenuItemClickListener {
companion object {
private const val BASE64_FLAGS = Base64.NO_PADDING or Base64.NO_WRAP
private val channels by lazy { (1..165).map { BandOption.Channel(it) } }
private val channels by lazy {
val list = ArrayList<BandOption.Channel>()
for (chan in 1..14) list.add(BandOption.Channel(SoftApConfigurationCompat.BAND_2GHZ, chan))
for (chan in 1..196) list.add(BandOption.Channel(SoftApConfigurationCompat.BAND_5GHZ, chan))
if (Build.VERSION.SDK_INT >= 30) {
for (chan in 1..253) list.add(BandOption.Channel(SoftApConfigurationCompat.BAND_6GHZ, chan))
}
list
}
/**
* Source: https://android.googlesource.com/platform/frameworks/opt/net/wifi/+/c2fc6a1/service/java/com/android/server/wifi/p2p/SupplicantP2pIfaceHal.java#1396
*/
private val p2pChannels by lazy {
(1..165).map {
val band = if (it <= 14) SoftApConfigurationCompat.BAND_2GHZ else SoftApConfigurationCompat.BAND_5GHZ
BandOption.Channel(band, it)
}
}
}
@Parcelize
@@ -73,8 +90,8 @@ class WifiApDialogFragment : AlertDialogFragment<WifiApDialogFragment.Arg, WifiA
override val band get() = SoftApConfigurationCompat.BAND_6GHZ
override fun toString() = app.getString(R.string.wifi_ap_choose_6G)
}
class Channel(override val channel: Int) : BandOption() {
override fun toString() = "${SoftApConfigurationCompat.channelToFrequency(channel)} MHz ($channel)"
class Channel(override val band: Int, override val channel: Int) : BandOption() {
override fun toString() = "${SoftApConfigurationCompat.channelToFrequency(band, channel)} MHz ($channel)"
}
}
@@ -132,13 +149,14 @@ class WifiApDialogFragment : AlertDialogFragment<WifiApDialogFragment.Arg, WifiA
add(BandOption.Band2GHz)
add(BandOption.Band5GHz)
}
addAll(p2pChannels)
} else {
if (Build.VERSION.SDK_INT >= 28) add(BandOption.BandAny)
add(BandOption.Band2GHz)
add(BandOption.Band5GHz)
if (Build.VERSION.SDK_INT >= 30) add(BandOption.Band6GHz)
addAll(channels)
}
addAll(channels)
}
adapter = ArrayAdapter(activity, android.R.layout.simple_spinner_item, 0, bandOptions).apply {
setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)