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/*
* encode and decode methods from:
* https://en.wikipedia.org/wiki/Base64#Sample_Implementation_in_Java
* Available under the Creative Commons Attribution-ShareAlike License.
* http://creativecommons.org/licenses/by-sa/3.0/
* Modifiication: added test code
*/
/*
* Description: Uses a Base64 MIME implementation to check for regressions
in loops, array access, load/store, and string manipulation.
* Main Focus: General operations related to Base64 encoding/decoding.
* Secondary Focus: Array access, load/store, string manipulation.
*
*/
package org.linaro.benchmarks.micro;
import java.lang.IllegalArgumentException;
import java.lang.StringBuilder;
import java.lang.System;
import java.lang.Thread;
import java.util.Random;
import org.openjdk.jmh.annotations.*;
import java.util.concurrent.TimeUnit;
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.MICROSECONDS)
@State(Scope.Benchmark)
public class Base64 {
private static Random rnd = new Random();
private static final int ENC_Length = 64;
private static final int NUM_Encodings = 16;
private static String[] randomStrings = new String[NUM_Encodings];
private static String[] randomBase64 = new String[NUM_Encodings];
private static String[] encodeResults = new String[NUM_Encodings];
private static String[] decodeResults = new String[NUM_Encodings];
private static final String codes =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
private static char base64Pad = '=';
static {
generateRandomStrings();
generateRandomBase64();
}
private static void generateRandomStrings() {
for (int i = 0; i < NUM_Encodings; i++) {
StringBuilder sb = new StringBuilder();
for (int j = 0; j < ENC_Length; j++) {
sb.append(Character.valueOf((char)rnd.nextInt()));
}
randomStrings[i] = sb.toString();
}
}
private static void generateRandomBase64() {
for (int i = 0; i < NUM_Encodings; i++) {
StringBuilder sb = new StringBuilder();
for (int j = 0; j < ENC_Length; j++) {
sb.append(codes.charAt(rnd.nextInt(codes.length() - 1)));
}
randomBase64[i] = sb.toString();
}
}
private static String encode(String str) {
byte[] in = str.getBytes();
StringBuffer out = new StringBuffer((in.length * 4) / 3);
int b;
for (int i = 0; i < in.length; i += 3) {
b = (in[i] & 0xFC) >> 2;
out.append(codes.charAt(b));
b = (in[i] & 0x03) << 4;
if (i + 1 < in.length) {
b |= (in[i + 1] & 0xF0) >> 4;
out.append(codes.charAt(b));
b = (in[i + 1] & 0x0F) << 2;
if (i + 2 < in.length) {
b |= (in[i + 2] & 0xC0) >> 6;
out.append(codes.charAt(b));
b = in[i + 2] & 0x3F;
out.append(codes.charAt(b));
} else {
out.append(codes.charAt(b));
out.append('=');
}
} else {
out.append(codes.charAt(b));
out.append("==");
}
}
return out.toString();
}
private static byte[] decode(String input) {
if (input.length() % 4 != 0) {
System.err.println("Invalid base64 input");
return null;
}
int eqPos = input.indexOf('=');
int len = input.length();
byte[] decoded =
new byte[((len * 3) / 4) - (eqPos > 0 ? (len - eqPos) : 0)];
char[] inChars = input.toCharArray();
int j = 0;
int[] b = new int[4];
for (int i = 0; i < inChars.length; i += 4) {
b[0] = codes.indexOf(inChars[i]);
b[1] = codes.indexOf(inChars[i + 1]);
b[2] = codes.indexOf(inChars[i + 2]);
b[3] = codes.indexOf(inChars[i + 3]);
decoded[j++] = (byte) ((b[0] << 2) | (b[1] >> 4));
if (b[2] < 64) {
decoded[j++] = (byte) ((b[1] << 4) | (b[2] >> 2));
if (b[3] < 64) {
decoded[j++] = (byte) ((b[2] << 6) | b[3]);
}
}
}
return decoded;
}
@Benchmark
public void jmhTimeEncode() {
for (int j = 0; j < NUM_Encodings; j++) {
encodeResults[j] = encode(randomStrings[j]);
}
}
@Benchmark
public void jmhTimeDecode() {
for (int j = 0; j < NUM_Encodings; j++) {
decodeResults[j] = new String(decode(randomBase64[j]));
}
}
}
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