Examples of org.codehaus.preon.buffer.BitBuffer

org.codehaus.preon.buffer.BitBuffer
The interface providing methods reading a given number of bits from the byte buffer and conveting them to the byte, short, int, long (all unsigned) and also to the boolean type values. It is possible to start reading from any location in the byte buffer by explicitly giving the bit position of the first bit to read. The API also supports reading values one by one by setting the position of the first bit to read to the internal bit pointer position. Both little and big endian reading formats are supported.
In case of byte base reading i.e. given bits fit completely all bits in bytes, the big endian and little endian implementations differ only in the reversed bytes order. Otherwise, the implementation is more complicated - in order to read the given bits, the buffering bytes containing these bits are stored in internal buffer. For the little endian implementation the offset to the closest given bit is calucated from the least significant bit in that internal buffer, but for the big endian from the most significant bit (e.g. for the byte: 11010011 and bit position = 1 and number of bits to read = 3, the given bits would be 101 for big endian and 001 for little endian, what gives the values 5 and 1 respectively. @author Wilfred Springer

        this.wrapped = wrapped;
    }


    public T decode(BitBuffer buffer, Resolver resolver, Builder builder)
            throws DecodingException {
        BitBuffer slice = buffer
                .slice(sizeExpr.eval(resolver));
        return wrapped.decode(slice, resolver, builder);
    }

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        };
    }


    public void testSelectFrom() throws DecodingException {
        BitBuffer buffer = new DefaultBitBuffer(ByteBuffer.wrap(new byte[]{0, 1, (byte) 255,
                (byte) 255, (byte) 255, (byte) 255}));


        // We expect all Codecs to be constructed
        expect(codecFactory.create(null, Float.class, context)).andReturn(floatCodec);
        expect(

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        codec.encode(original, new OutputStreamBitChannel(out), resolver);
        byte[] encoded = out.toByteArray();
        assertThat(encoded.length, is(size));


        BitBuffer buffer = new DefaultBitBuffer(ByteBuffer.wrap(encoded));
        String result = codec.decode(buffer, resolver, builder);
        assertThat(result, is(original));
    }

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        assertNull(factory.create(metadata, Boolean.class, null));
        verify(metadata);
    }


    public void testDecoding() throws DecodingException {
        BitBuffer buffer = new DefaultBitBuffer(ByteBuffer.wrap(new byte[]{(byte) 0xF0}));
        expect(metadata.isAnnotationPresent(Bound.class)).andReturn(true);
        replay(metadata);
        Codec<Boolean> codec = factory.create(metadata, Boolean.class, null);
        assertTrue(codec.decode(buffer, null, null));
        assertTrue(codec.decode(buffer, null, null));

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                ByteOrder.LittleEndian);


        // Replay
        EasyMock.replay(metadata, boundNumber);
        EnumCodec.Factory factory = new EnumCodec.Factory();
        BitBuffer buffer = new DefaultBitBuffer(ByteBuffer.wrap(new byte[]{0,
                1}));
        Codec<Direction> codec = factory
                .create(metadata, Direction.class, null);
        assertNotNull(codec);
        assertEquals(Direction.Left, codec.decode(buffer, null, null));

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Related Classes of org.codehaus.preon.buffer.BitBuffer

org.codehaus.preon.codec.BooleanCodecFactoryTest

org.codehaus.preon.codec.EnumCodecFactoryTest

org.codehaus.preon.codec.FixedLengthStringCodecTest

org.codehaus.preon.codec.SelectFromCodecTest

org.codehaus.preon.codec.SlicingCodec

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