private Folder readFolder()

in src/main/java/org/apache/commons/compress/archivers/sevenz/SevenZFile.java [1227:1295]
63 lines of code
10 McCabe index (conditional complexity)

    private Folder readFolder(final ByteBuffer header) throws IOException {
        final Folder folder = new Folder();

        final long numCoders = readUint64(header);
        final Coder[] coders = new Coder[(int)numCoders];
        long totalInStreams = 0;
        long totalOutStreams = 0;
        for (int i = 0; i < coders.length; i++) {
            coders[i] = new Coder();
            final int bits = getUnsignedByte(header);
            final int idSize = bits & 0xf;
            final boolean isSimple = (bits & 0x10) == 0;
            final boolean hasAttributes = (bits & 0x20) != 0;
            final boolean moreAlternativeMethods = (bits & 0x80) != 0;

            coders[i].decompressionMethodId = new byte[idSize];
            get(header, coders[i].decompressionMethodId);
            if (isSimple) {
                coders[i].numInStreams = 1;
                coders[i].numOutStreams = 1;
            } else {
                coders[i].numInStreams = readUint64(header);
                coders[i].numOutStreams = readUint64(header);
            }
            totalInStreams += coders[i].numInStreams;
            totalOutStreams += coders[i].numOutStreams;
            if (hasAttributes) {
                final long propertiesSize = readUint64(header);
                coders[i].properties = new byte[(int)propertiesSize];
                get(header, coders[i].properties);
            }
            // would need to keep looping as above:
            if (moreAlternativeMethods) {
                throw new IOException("Alternative methods are unsupported, please report. " + // NOSONAR
                    "The reference implementation doesn't support them either.");
            }
        }
        folder.coders = coders;
        folder.totalInputStreams = totalInStreams;
        folder.totalOutputStreams = totalOutStreams;

        final long numBindPairs = totalOutStreams - 1;
        final BindPair[] bindPairs = new BindPair[(int)numBindPairs];
        for (int i = 0; i < bindPairs.length; i++) {
            bindPairs[i] = new BindPair();
            bindPairs[i].inIndex = readUint64(header);
            bindPairs[i].outIndex = readUint64(header);
        }
        folder.bindPairs = bindPairs;

        final long numPackedStreams = totalInStreams - numBindPairs;
        final long[] packedStreams = new long[(int)numPackedStreams];
        if (numPackedStreams == 1) {
            int i;
            for (i = 0; i < (int)totalInStreams; i++) {
                if (folder.findBindPairForInStream(i) < 0) {
                    break;
                }
            }
            packedStreams[0] = i;
        } else {
            for (int i = 0; i < (int)numPackedStreams; i++) {
                packedStreams[i] = readUint64(header);
            }
        }
        folder.packedStreams = packedStreams;

        return folder;
    }