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refactor: add channel hash function

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This commit is contained in:
andrekir 2024-01-10 05:33:19 -03:00
parent 505ba8a7d3
commit e9f63b4e80
4 changed files with 67 additions and 48 deletions
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19
app/src/main/java/com/geeksville/mesh/model/Channel.kt
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@ -89,24 +89,13 @@ data class Channel(
}
/**
* hash a string into an integer using the djb2 algorithm by Dan Bernstein
* http://www.cse.yorku.ca/~oz/hash.html
* Given a channel name and psk, return the (0 to 255) hash for that channel
*/
val hash: UInt // using UInt instead of Long to match RadioInterface.cpp results
get() {
var hash: UInt = 5381u
for (c in name) {
hash += (hash shl 5) + c.code.toUInt()
print("$c ${c.code} $hash ")
}
return hash
}
val hash: Int get() = xorHash(name.toByteArray()) xor xorHash(psk.toByteArray())
val channelNum: Int
get() = if (loraConfig.channelNum != 0) loraConfig.channelNum
else (hash % RegionInfo.numChannels(loraConfig).toUInt()).toInt() + 1
val channelNum: Int get() = loraConfig.channelNum(name)
val radioFreq: Float get() = RegionInfo.radioFreq(loraConfig, channelNum)
val radioFreq: Float get() = loraConfig.radioFreq(channelNum)
override fun equals(other: Any?): Boolean = (other is Channel)
&& psk.toByteArray() contentEquals other.psk.toByteArray()