public int readBytes()

in hessian-lite/src/main/java/com/alibaba/com/caucho/hessian/io/Hessian2Input.java [2120:2212]
83 lines of code
35 McCabe index (conditional complexity)

    public int readBytes(byte[] buffer, int offset, int length)
            throws IOException {
        int readLength = 0;

        if (_chunkLength == END_OF_DATA) {
            _chunkLength = 0;
            return -1;
        } else if (_chunkLength == 0) {
            int tag = read();

            switch (tag) {
                case 'N':
                    return -1;

                case 'B':
                case BC_BINARY_CHUNK:
                    _isLastChunk = tag == 'B';
                    _chunkLength = (read() << 8) + read();
                    break;

                case 0x20:
                case 0x21:
                case 0x22:
                case 0x23:
                case 0x24:
                case 0x25:
                case 0x26:
                case 0x27:
                case 0x28:
                case 0x29:
                case 0x2a:
                case 0x2b:
                case 0x2c:
                case 0x2d:
                case 0x2e:
                case 0x2f: {
                    _isLastChunk = true;
                    _chunkLength = tag - 0x20;
                    break;
                }

                case 0x34:
                case 0x35:
                case 0x36:
                case 0x37: {
                    _isLastChunk = true;
                    _chunkLength = (tag - 0x34) * 256 + read();
                    break;
                }

                default:
                    throw expect("binary", tag);
            }
        }

        while (length > 0) {
            if (_chunkLength > 0) {
                buffer[offset++] = (byte) read();
                _chunkLength--;
                length--;
                readLength++;
            } else if (_isLastChunk) {
                if (readLength == 0)
                    return -1;
                else {
                    _chunkLength = END_OF_DATA;
                    return readLength;
                }
            } else {
                int tag = read();

                switch (tag) {
                    case 'B':
                    case BC_BINARY_CHUNK:
                        _isLastChunk = tag == 'B';
                        _chunkLength = (read() << 8) + read();
                        break;

                    default:
                        throw expect("binary", tag);
                }
            }
        }

        if (readLength == 0)
            return -1;
        else if (_chunkLength > 0 || !_isLastChunk)
            return readLength;
        else {
            _chunkLength = END_OF_DATA;
            return readLength;
        }
    }