Varint Encoding

Varint.kt

    fun writeVarint(long: Long) {
        require(long >= 0) { "Varint must be non-negative" }
        var v = long
        while (v and 0x7fL.inv() != 0L) {
            writeByte(((v and 0x7fL) or 0x80L).toByte())
            v = v ushr 7
        }
        writeByte((v and 0x7fL).toByte())
    }
    
    fun readVarint(): Long {
        var result = 0L
        var shift = 0
        while(true) {
            val byte = readByte().toLong()
            result = result or ((byte and 0x7fL) shl shift)
            if (byte and 0x80L == 0L) break
            shift += 7
            if (shift > 63) {
                throw IllegalArgumentException("Invalid varint value: overflow while decoding")
            }
        }
        return result
    }
    
    fun writeByte(value: Byte)
    
    fun readByte(): Byte