32 lines
965 B
Kotlin
32 lines
965 B
Kotlin
// version 1.0.6
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fun Int.toOctets(): ByteArray {
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var s = Integer.toBinaryString(this)
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val r = s.length % 7
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var z = s.length / 7
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if (r > 0) {
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z++
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s = s.padStart(z * 7, '0')
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}
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s = Array(z) { "1" + s.slice(it * 7 until (it + 1) * 7) }.joinToString("")
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s = s.take(s.length - 8) + "0" + s.takeLast(7)
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return ByteArray(z) { Integer.parseInt(s.slice(it * 8 until (it + 1) * 8), 2).toByte() }
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}
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fun ByteArray.fromOctets(): Int {
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var s = ""
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for (b in this) s += Integer.toBinaryString(b.toInt()).padStart(7, '0').takeLast(7)
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return Integer.parseInt(s, 2)
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}
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fun main(args: Array<String>) {
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val tests = intArrayOf(0x7f, 0x3fff, 0x200000, 0x1fffff)
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for (test in tests) {
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val ba = test.toOctets()
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print("${"0x%x".format(test).padEnd(8)} -> ")
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var s = ""
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ba.forEach { s += "0x%02x ".format(it) }
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println("${s.padEnd(20)} <- ${"0x%x".format(ba.fromOctets())}")
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}
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}
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