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Code Issues Projects Releases Wiki Activity

Improve binToNibble performance

This commit is contained in:
nicksavers 2014-08-03 20:51:08 +02:00
parent 59d8dfbed0
commit a5802b9398
1 changed files with 14 additions and 14 deletions
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26
ethereumj-core/src/main/java/org/ethereum/util/CompactEncoder.java
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@ -1,13 +1,14 @@
package org.ethereum.util;
import java.io.ByteArrayOutputStream;
import static java.util.Arrays.copyOfRange;
import static java.util.Arrays.copyOf;
import static java.util.Arrays.copyOfRange;
import static org.ethereum.util.ByteUtil.appendByte;
import static org.spongycastle.util.Arrays.concatenate;
import static org.spongycastle.util.encoders.Hex.toHexString;
import static org.spongycastle.util.encoders.Hex.encode;
import java.io.ByteArrayOutputStream;
import java.nio.ByteBuffer;
/**
* Compact encoding of hex sequence with optional terminator
@ -85,11 +86,11 @@ public class CompactEncoder {
*/
public static byte[] unpackToNibbles(byte[] str) {
byte[] base = binToNibbles(str);
base = copyOf(base, base.length-1);
base = copyOf(base, base.length - 1);
if (base[0] >= 2) {
base = appendByte(base, TERMINATOR);
}
if (base[0]%2 == 1) {
if (base[0] % 2 == 1) {
base = copyOfRange(base, 1, base.length);
} else {
base = copyOfRange(base, 2, base.length);
@ -103,13 +104,12 @@ public class CompactEncoder {
* @return array with each individual nibble adding a terminator at the end
*/
public static byte[] binToNibbles(byte[] str) {
byte[] hexSlice = new byte[0];
String hexEncoded = toHexString(str);
for (char value : hexEncoded.toCharArray()) {
hexSlice = appendByte(hexSlice, (byte) hexBase.indexOf(value));
byte[] hexEncoded = encode(str);
ByteBuffer slice = ByteBuffer.allocate(hexEncoded.length + 1);
for (byte b : hexEncoded) {
slice.put((byte)hexBase.indexOf(b));
}
hexSlice = appendByte(hexSlice, TERMINATOR);
return hexSlice;
slice.put(TERMINATOR);
return slice.array();
}
}