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Basic implementation of Binary struct parsing

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Ziver Koc 2016-01-31 15:13:07 +01:00
parent da54bc8db5
commit b7bedc94cd
5 changed files with 123 additions and 6 deletions
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src/zutil/ByteUtil.java Executable file
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package zutil;
/**
* Utility functions for byte primitive type
*
* Created by Ziver on 2016-01-30.
*/
public class ByteUtil {
private static final int[][] BYTE_MASK = new int[][]{
{0b0000_0001},
{0b0000_0010, 0b0000_0011},
{0b0000_0100, 0b0000_0110, 0b0000_0111},
{0b0000_1000, 0b0000_1100, 0b0000_1110, 0b0000_1111},
{0b0001_0000, 0b0001_1000, 0b0001_1100, 0b0001_1110, 0b0001_1111},
{0b0010_0000, 0b0011_0000, 0b0011_1000, 0b0011_1100, 0b0011_1110, 0b0011_1111},
{0b0100_0000, 0b0110_0000, 0b0111_0000, 0b0111_1000, 0b0111_1100, 0b0111_1110, 0b0111_1111},
{0b1000_0000, 0b1100_0000, 0b1110_0000, 0b1111_0000, 0b1111_1000, 0b1111_1100, 0b1111_1110, 0b1111_1111}
};
public static byte getBits(byte data, int index, int length){
length--;
if(0 > index || index > 7)
throw new IllegalArgumentException("Invalid index argument, allowed value is 0-7");
if(length < 0 && index-length < 0)
throw new IllegalArgumentException("Invalid length argument: "+length+", allowed values 1-8 depending on index");
int ret = data & BYTE_MASK[index][length];
ret = ret >>> index-length;
return (byte) ret;
}
}