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bugfix of LongDelta #67

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Merged
lemire merged 1 commit into from
Nov 25, 2025
Merged

bugfix of LongDelta #67

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2 changes: 1 addition & 1 deletion src/main/java/me/lemire/longcompression/differential/LongDelta.java
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Original file line number Diff line number Diff line change
Expand Up @@ -107,7 +107,7 @@ public static void fastinverseDelta(long[] data) {
}
}

for (; i != data.length; ++i) {
for (; i < data.length; ++i) {
data[i] += data[i - 1];
}
}
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23 changes: 23 additions & 0 deletions src/test/java/me/lemire/longcompression/LongDeltaTest.java
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Original file line number Diff line number Diff line change
@@ -0,0 +1,23 @@
package me.lemire.longcompression;

import me.lemire.longcompression.differential.LongDelta;
import org.junit.Test;

import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertNotNull;

public class LongDeltaTest {
@Test
public void testEmptyArrayFastInverseDelta() {
LongCompressor compressor = new LongCompressor();
long[] input = new long[0];

LongDelta.delta(input);
long[] compressed = compressor.compress(input);
long[] result = compressor.uncompress(compressed);
LongDelta.fastinverseDelta(result);

assertNotNull(result);
assertArrayEquals(input, result);
}
}