/**
* Calculates the hash code of the specified buffer. This method is useful when implementing a new
* buffer type.
*/
public static int hashCode(ChannelBuffer buffer) {
final int aLen = buffer.readableBytes();
final int intCount = aLen >>> 2;
final int byteCount = aLen & 3;
int hashCode = 1;
int arrayIndex = buffer.readerIndex();
if (buffer.order() == BIG_ENDIAN) {
for (int i = intCount; i > 0; i--) {
hashCode = 31 * hashCode + buffer.getInt(arrayIndex);
arrayIndex += 4;
}
} else {
for (int i = intCount; i > 0; i--) {
hashCode = 31 * hashCode + swapInt(buffer.getInt(arrayIndex));
arrayIndex += 4;
}
}
for (int i = byteCount; i > 0; i--) {
hashCode = 31 * hashCode + buffer.getByte(arrayIndex++);
}
if (hashCode == 0) {
hashCode = 1;
}
return hashCode;
}
@Test
public void shouldForwardReadCallsBlindly() throws Exception {
ChannelBuffer buf = createStrictMock(ChannelBuffer.class);
expect(buf.readerIndex()).andReturn(0).anyTimes();
expect(buf.writerIndex()).andReturn(0).anyTimes();
expect(buf.capacity()).andReturn(0).anyTimes();
expect(buf.getBytes(1, (GatheringByteChannel) null, 2)).andReturn(3);
buf.getBytes(4, (OutputStream) null, 5);
buf.getBytes(6, (byte[]) null, 7, 8);
buf.getBytes(9, (ChannelBuffer) null, 10, 11);
buf.getBytes(12, (ByteBuffer) null);
expect(buf.getByte(13)).andReturn(Byte.valueOf((byte) 14));
expect(buf.getShort(15)).andReturn(Short.valueOf((short) 16));
expect(buf.getUnsignedMedium(17)).andReturn(18);
expect(buf.getInt(19)).andReturn(20);
expect(buf.getLong(21)).andReturn(22L);
ByteBuffer bb = ByteBuffer.allocate(100);
ByteBuffer[] bbs = {ByteBuffer.allocate(101), ByteBuffer.allocate(102)};
expect(buf.toByteBuffer(23, 24)).andReturn(bb);
expect(buf.toByteBuffers(25, 26)).andReturn(bbs);
expect(buf.capacity()).andReturn(27);
replay(buf);
ChannelBuffer roBuf = unmodifiableBuffer(buf);
assertEquals(3, roBuf.getBytes(1, (GatheringByteChannel) null, 2));
roBuf.getBytes(4, (OutputStream) null, 5);
roBuf.getBytes(6, (byte[]) null, 7, 8);
roBuf.getBytes(9, (ChannelBuffer) null, 10, 11);
roBuf.getBytes(12, (ByteBuffer) null);
assertEquals((byte) 14, roBuf.getByte(13));
assertEquals((short) 16, roBuf.getShort(15));
assertEquals(18, roBuf.getUnsignedMedium(17));
assertEquals(20, roBuf.getInt(19));
assertEquals(22L, roBuf.getLong(21));
ByteBuffer roBB = roBuf.toByteBuffer(23, 24);
assertEquals(100, roBB.capacity());
assertTrue(roBB.isReadOnly());
ByteBuffer[] roBBs = roBuf.toByteBuffers(25, 26);
assertEquals(2, roBBs.length);
assertEquals(101, roBBs[0].capacity());
assertTrue(roBBs[0].isReadOnly());
assertEquals(102, roBBs[1].capacity());
assertTrue(roBBs[1].isReadOnly());
assertEquals(27, roBuf.capacity());
verify(buf);
}
/**
* Compares the two specified buffers as described in {@link
* ChannelBuffer#compareTo(ChannelBuffer)}. This method is useful when implementing a new buffer
* type.
*/
public static int compare(ChannelBuffer bufferA, ChannelBuffer bufferB) {
final int aLen = bufferA.readableBytes();
final int bLen = bufferB.readableBytes();
final int minLength = Math.min(aLen, bLen);
final int uintCount = minLength >>> 2;
final int byteCount = minLength & 3;
int aIndex = bufferA.readerIndex();
int bIndex = bufferB.readerIndex();
if (bufferA.order() == bufferB.order()) {
for (int i = uintCount; i > 0; i--) {
long va = bufferA.getUnsignedInt(aIndex);
long vb = bufferB.getUnsignedInt(bIndex);
if (va > vb) {
return 1;
} else if (va < vb) {
return -1;
}
aIndex += 4;
bIndex += 4;
}
} else {
for (int i = uintCount; i > 0; i--) {
long va = bufferA.getUnsignedInt(aIndex);
long vb = swapInt(bufferB.getInt(bIndex)) & 0xFFFFFFFFL;
if (va > vb) {
return 1;
} else if (va < vb) {
return -1;
}
aIndex += 4;
bIndex += 4;
}
}
for (int i = byteCount; i > 0; i--) {
short va = bufferA.getUnsignedByte(aIndex);
short vb = bufferB.getUnsignedByte(bIndex);
if (va > vb) {
return 1;
} else if (va < vb) {
return -1;
}
aIndex++;
bIndex++;
}
return aLen - bLen;
}
public int getInt(int index) {
return buffer.getInt(index);
}
