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package org.bouncycastle.pqc.crypto.test;
import junit.framework.TestCase;
import org.bouncycastle.pqc.crypto.ntru.IndexGenerator.BitString;
import org.bouncycastle.util.Arrays;
public class BitStringTest
extends TestCase
{
public void testAppendBitsByteArray()
{
BitString bs = new BitString();
bs.appendBits((byte)78);
assertBitStringEquals(bs, new byte[]{78});
bs.appendBits((byte)-5);
assertBitStringEquals(bs, new byte[]{78, -5});
bs.appendBits((byte)127);
assertBitStringEquals(bs, new byte[]{78, -5, 127});
bs.appendBits((byte)0);
assertBitStringEquals(bs, new byte[]{78, -5, 127, 0});
bs.appendBits((byte)100);
assertBitStringEquals(bs, new byte[]{78, -5, 127, 0, 100});
}
private void assertBitStringEquals(BitString bs, byte[] arr)
{
byte[] bsBytes = bs.getBytes();
assertTrue(bsBytes.length >= arr.length);
arr = copyOf(arr, bsBytes.length);
assertTrue(Arrays.areEqual(arr, bsBytes));
}
public void testGetTrailing()
{
BitString bs = new BitString();
bs.appendBits((byte)78);
BitString bs2 = bs.getTrailing(3);
assertBitStringEquals(bs2, new byte[]{6});
bs = new BitString();
bs.appendBits((byte)78);
bs.appendBits((byte)-5);
bs2 = bs.getTrailing(9);
assertBitStringEquals(bs2, new byte[]{78, 1});
bs2.appendBits((byte)100);
assertBitStringEquals(bs2, new byte[]{78, -55});
bs = bs2.getTrailing(13);
assertBitStringEquals(bs, new byte[]{78, 9});
bs2 = bs2.getTrailing(11);
assertBitStringEquals(bs2, new byte[]{78, 1});
bs2.appendBits((byte)100);
assertBitStringEquals(bs2, new byte[]{78, 33, 3});
bs2 = bs2.getTrailing(16);
assertBitStringEquals(bs2, new byte[]{78, 33});
}
public void testGetLeadingAsInt()
{
BitString bs = new BitString();
bs.appendBits((byte)78);
bs.appendBits((byte)42);
assertEquals(1, bs.getLeadingAsInt(3));
assertEquals(84, bs.getLeadingAsInt(9));
assertEquals(338, bs.getLeadingAsInt(11));
BitString bs2 = bs.getTrailing(11);
assertBitStringEquals(bs2, new byte[]{78, 2});
assertEquals(590, bs2.getLeadingAsInt(11));
assertEquals(9, bs2.getLeadingAsInt(5));
bs2.appendBits((byte)115);
assertEquals(230, bs2.getLeadingAsInt(9));
assertEquals(922, bs2.getLeadingAsInt(11));
bs2.appendBits((byte)-36);
assertEquals(55, bs2.getLeadingAsInt(6));
}
private byte[] copyOf(byte[] src, int length)
{
byte[] tmp = new byte[length];
System.arraycopy(src, 0, tmp, 0, tmp.length > src.length ? src.length : tmp.length);
return tmp;
}
}
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