Hjg.Pngcs.PngReader.ReadLastChunks C# (CSharp) Method

        private void ReadLastChunks()
        {
            CurrentChunkGroup = ChunksList.CHUNK_GROUP_5_AFTERIDAT;
            // PngHelper.logdebug("idat ended? " + iIdatCstream.isEnded());
            if (!iIdatCstream.IsEnded())
                iIdatCstream.ForceChunkEnd();
            int clen = iIdatCstream.GetLenLastChunk();
            byte[] chunkid = iIdatCstream.GetIdLastChunk();
            bool endfound = false;
            bool first = true;
            bool skip = false;
            while (!endfound) {
                skip = false;
                if (!first) {
                    clen = PngHelperInternal.ReadInt4(inputStream);
                    offset += 4;
                    if (clen < 0)
                        throw new PngjInputException("bad len " + clen);
                    PngHelperInternal.ReadBytes(inputStream, chunkid, 0, 4);
                    offset += 4;
                }
                first = false;
                if (PngCsUtils.arraysEqual4(chunkid, ChunkHelper.b_IDAT)) {
                    skip = true; // extra dummy (empty?) idat chunk, it can happen, ignore it
                } else if (PngCsUtils.arraysEqual4(chunkid, ChunkHelper.b_IEND)) {
                    CurrentChunkGroup = ChunksList.CHUNK_GROUP_6_END;
                    endfound = true;
                }
                ReadChunk(chunkid, clen, skip);
            }
            if (!endfound)
                throw new PngjInputException("end chunk not found - offset=" + offset);
            // PngHelper.logdebug("end chunk found ok offset=" + offset);
        }