62 lines
1.7 KiB
Kotlin

package net.sergeych.lynon
import net.sergeych.lyng.Scope
import net.sergeych.lyng.obj.Obj
import net.sergeych.lyng.obj.ObjBool
import net.sergeych.lyng.obj.ObjChar
import net.sergeych.lyng.obj.ObjInt
class LynonPacker(private val bout: MemoryBitOutput= MemoryBitOutput()) : LynonEncoder(bout) {
fun toUByteArray(): UByteArray = bout.toUByteArray()
}
class LynonUnpacker(source: UByteArray) : LynonDecoder(MemoryBitInput(source))
open class LynonEncoder(private val bout: BitOutput) {
fun shouldCache(obj: Obj): Boolean = when (obj) {
is ObjChar -> false
is ObjInt -> obj.value > 0x10000FF
is ObjBool -> false
else -> true
}
val cache = mutableMapOf<Obj,Int>()
suspend fun packObject(scope: Scope,obj: Obj) {
cache[obj]?.let { cacheId ->
val size = sizeInBits(cache.size)
bout.putBit(1)
bout.putBits(cacheId, size)
} ?: run {
bout.putBit(0)
if( shouldCache(obj) ) {
bout.putBit(1)
cache[obj] = cache.size
}
else
bout.putBit(0)
obj.serialize(scope, this)
}
}
fun packBinaryData(data: ByteArray) {
bout.packUnsigned(data.size.toULong())
bout.putBytes(data)
}
fun packSigned(value: Long) { bout.packSigned(value) }
@Suppress("unused")
fun packUnsigned(value: ULong) { bout.packUnsigned(value) }
@Suppress("unused")
fun packBool(value: Boolean) { bout.putBit(if (value) 1 else 0) }
fun packReal(value: Double) {
bout.putBits(value.toRawBits().toULong(), 64)
}
fun packBoolean(value: Boolean) {
bout.putBit(if (value) 1 else 0)
}
}