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added reverse byte order function

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This commit is contained in:
Ziver Koc 2016-04-15 17:50:58 +02:00
parent 542b242c41
commit 0495d3289b
2 changed files with 23 additions and 0 deletions
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15
src/zutil/ByteUtil.java
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@ -95,6 +95,21 @@ public class ByteUtil {
return dest; return dest;
} }
/**
* Creates a new byte array with reversed byte ordering
* (LittleEndian -> BigEndian, BigEndian -> LittleEndian)
*
* @param data is the byte array that will be reversed.
* @return a new byte array that will have the same data but in reverse byte order
*/
public static byte[] getReverseByteOrder(byte[] data){
byte[] dest = new byte[data.length];
if (data.length > 0)
for (int i=0; i<data.length; ++i)
dest[dest.length-1-i] = data[i];
return dest;
}
/** /**
* Returns a byte bitmask * Returns a byte bitmask
* *

8
test/zutil/ByteUtilTest.java
View file

@ -58,4 +58,12 @@ public class ByteUtilTest {
assertArrayEquals(new byte[]{0x00,0x01}, ByteUtil.getBits(new byte[]{0x00,0x01}, 9)); assertArrayEquals(new byte[]{0x00,0x01}, ByteUtil.getBits(new byte[]{0x00,0x01}, 9));
assertArrayEquals(new byte[]{0x00,0x01}, ByteUtil.getBits(new byte[]{0x00,0x11}, 9)); assertArrayEquals(new byte[]{0x00,0x01}, ByteUtil.getBits(new byte[]{0x00,0x11}, 9));
} }
@Test
public void getReverseByteOrder(){
assertArrayEquals(new byte[]{}, ByteUtil.getReverseByteOrder(new byte[]{}));
assertArrayEquals(new byte[]{0x11}, ByteUtil.getReverseByteOrder(new byte[]{0x11}));
assertArrayEquals(new byte[]{0x22,0x11}, ByteUtil.getReverseByteOrder(new byte[]{0x11,0x22}));
assertArrayEquals(new byte[]{0x44,0x33,0x22,0x11}, ByteUtil.getReverseByteOrder(new byte[]{0x11,0x22,0x33,0x44}));
}
} }