private String decodeUtf8String()

in serialization/src/main/java/com/twitter/serial/stream/bytebuffer/ByteBufferSerializerInput.java [264:296]

• 32 lines of code
• 7 McCabe index (conditional complexity)

    private String decodeUtf8String(int length) throws IOException {
        try {
            final ByteBuffer buffer = mByteBuffer;
            final StringBuilder builder = new StringBuilder(length);
            for (int i = 0; i < length; ++i) {
                final int b1 = buffer.get();
                if ((b1 & 0x80) == 0) {
                    builder.append((char) b1);
                } else if ((b1 & 0xE0) == 0xC0) {
                    final int b2 = buffer.get();
                    builder.append((char) (((b1 << 6) ^ b2) ^ 0x0f80));
                } else if ((b1 & 0xF0) == 0xE0) {
                    final int b2 = buffer.get();
                    final int b3 = buffer.get();
                    builder.append((char) (((b1 << 12) ^ (b2 << 6) ^ b3) ^ 0x1f80));
                } else if ((b1 & 0xF8) == 0xF0) {
                    final int b2 = buffer.get();
                    final int b3 = buffer.get();
                    final int b4 = buffer.get();
                    final int code = ((b1 & 0x07) << 18) | ((b2 & 0x3f) << 12) | ((b3 & 0x3f) << 6) | (b4 & 0x3f);
                    builder.append(Surrogate.highSurrogate(code));
                    builder.append(Surrogate.lowSurrogate(code));
                    //noinspection AssignmentToForLoopParameter
                    ++i;
                } else {
                    throw new SerializationException("Serialized string is malformed.");
                }
            }
            return builder.toString();
        } catch (BufferUnderflowException ignore) {
            throw new EOFException();
        }
    }