SubwayTooter-Android-App/apng/src/main/java/jp/juggler/apng/util/ByteSequenceQueue.kt

37 lines
934 B
Kotlin

package jp.juggler.apng.util
import java.util.*
import kotlin.math.min
internal class ByteSequenceQueue(private val bufferRecycler : (ByteSequence) -> Unit) {
private val list = LinkedList<ByteSequence>()
val remain : Int
get() = list.sumOf { it.length }
fun add(range : ByteSequence) =list.add(range)
fun clear() = list.onEach(bufferRecycler).clear()
fun readBytes(dst : ByteArray, offset : Int, length : Int) : Int {
var dstOffset = offset
var dstRemain = length
while(dstRemain > 0 && list.isNotEmpty()) {
val item = list.first()
if(item.length <= 0) {
bufferRecycler(item)
list.removeFirst()
} else {
val delta = min(item.length, dstRemain)
System.arraycopy(item.array, item.offset, dst, dstOffset, delta)
dstOffset += delta
dstRemain -= delta
item.offset += delta
item.length -= delta
}
}
return length - dstRemain
}
}