protected open fun startNewChunk()

in plot-api/src/commonMain/kotlin/org/jetbrains/letsPlot/util/pngj/ChunkSeqReader.kt [187:218]
22 lines of code
15 McCabe index (conditional complexity)

    protected open fun startNewChunk(len: Int, id: String, offset: Long) {
        println("New chunk: $id $len off:$offset")

        // check id an length
        if (id.length != 4 || id.all { it !in 'a'..'z' && it !in 'A'..'Z' }) throw PngjInputException("Bad chunk id: $id")
        if (len < 0) throw PngjInputException("Bad chunk len: $len")
        if (id == ChunkHelper.IDAT) idatBytes += len.toLong()
        val checkCrc = shouldCheckCrc(len, id)
        val skip = shouldSkipContent(len, id)
        val isIdatType = isIdatKind(id)
        // PngHelperInternal.debug("start new chunk id=" + id + " off=" + offset + "
        // skip=" + skip + " idat=" +
        // isIdatType);
        // first see if we should terminate an active curReaderDeflatedSet
        var forCurrentIdatSet = false
        if (curDeflatedSet != null && !curDeflatedSet!!.isClosed) forCurrentIdatSet = curDeflatedSet!!.ackNextChunkId(id)
        if (isIdatType && !skip) { // IDAT non skipped: create a DeflatedChunkReader owned by a idatSet
            if (!forCurrentIdatSet) {
                if (curDeflatedSet != null && !curDeflatedSet!!.isDone) throw PngjInputException("new IDAT-like chunk when previous was not done")
                curDeflatedSet = createIdatSet(id)
            }
            curChunkReader = object : DeflatedChunkReader(len, id, checkCrc, offset, curDeflatedSet!!) {
                override fun chunkDone() {
                    super.chunkDone()
                    postProcessChunk(this)
                }
            }
        } else { // for non-idat chunks (or skipped idat like)
            curChunkReader = createChunkReaderForNewChunk(id, len, offset, skip)
        }
        if (curChunkReader != null && !checkCrc) curChunkReader!!.setCrcCheck(false)
    }